ADC16DV160

ADC16DV160 Dual Channel, 16-Bit, 160 MSPS Analog-to-Digital Converter with DDR LVDS Outputs PRELIMINARY ADC16DV160 Dual Channel, 16-Bit, 160 MSPS Analog-to-Digital Converter with DDR LVDS Outputs General Description The ADC16DV160 is a monolithic dual channel high performance CMOS analog-to-digital converter capable of converting analog input signals into 16-bit digital words at rates up to 160 Mega Samples Per Second (MSPS). This converter uses a differential, pipelined architecture with digital error correction and an on-chip sample-and-hold circuit to minimize power consumption and external component count while providing excellent dynamic performance. Automatic power-up calibration enables excellent dynamic performance and reduces part-to-part variation, and the ADC16DV160 can be recalibrated at any time through the 3-wire Serial Peripheral Interface (SPI). An integrated low noise and stable voltage reference and differential reference buffer amplifier eases board level design. The on-chip duty cycle stabilizer with low additive jitter allows a wide range of input clock duty cycles without compromising dynamic performance. A unique sample-and-hold stage yields a full-power bandwidth of 1.4 GHz. The interface between the ADC16DV160 and a receiver block can be easily verified and optimized via fixed pattern generation and output clock position features. The digital data is provided via dual data rate LVDS outputs – making possible the 68-pin, 10 mm x 10 mm LLP package. The ADC16DV160 operates on dual power supplies of +1.8V and +3.0V with a power-down feature to reduce power consumption to very low levels while allowing fast recovery to full operation. August 17, 2009 ■ ■ ■ ■ ■ ■ ■ On-chip low jitter duty-cycle stabilizer Power-down and sleep modes Output fixed pattern generation Output clock position adjustment 3-wire SPI Offset binary or 2's complement data format 68-pin LLP package (10x10x0.8, 0.5mm pin-pitch) Key Specifications ■ Resolution ■ Conversion Rate ■ SNR ■ ■ ■ (@FIN = 30 MHz) (@FIN = 197 MHz) SFDR (@FIN = 30 MHz) (@FIN = 197 MHz) Full Power Bandwidth Power Consumption -Core per channel -LVDS Driver -Total Operating Temperature Range 16 Bits 160 MSPS    78.5 dBFS (typ) 76.3 dBFS (typ)    95 dBFS (typ) 91.2 dBFS (typ) 1.4 GHz (typ)    591 mW (typ) 118 mW (typ) 1.3W (typ) -40°C ~ 85°C ■ Features ■ ■ ■ ■ ■ ■ ■ ■ Low power consumption On-chip precision reference and sample-and-hold circuit On-chip automatic calibration during power-up Dual data rate LVDS output port Dual Supplies: 1.8V and 3.0V operation Selectable input range: 2.4, 2.0, 1.5 and 1.0VPP Sampling edge flipping with clock divider by 2 option Integer clock divider by 1 or 2 Applications ■ Multi-carrier, Multi-standard Base Station Receivers ■ ■ ■ ■ ■ -MC-GSM/EDGE, CDMA2000, UMTS, LTE and WiMAX High IF Sampling Receivers Diversity Channel Receivers Test and Measurement Equipment Communications Instrumentation Portable Instrumentation © 2009 National Semiconductor Corporation 301014 www.national.com ADC16DV160 Block Diagram 30101402 Functional Block Diagram www.national.com 2 ADC16DV160 Connection Diagram 30101401 Pin-Out of ADC16DV160 Ordering Information Industrial (−40°C ≤ +85°C) ADC16DV160CILQ ADC16DV160EB Package 68–pin LLP Evaluation Board 3 www.national.com ADC16DV160 Pin Descriptions Pin(s) ANALOG I/O 66 20 67 19 VIN+1 VIN+Q VIN−1 VIN−Q VRPI VRPQ Input Input Differential analog input pins. The differential full-scale input signal level is 2.4 VPP by default, but can be set to 2.4/2.0/1.5/1.0 VPP via SPI. Each input pin signal is centered on a common mode voltage, VCM. Upper reference voltage. This pin should not be used to source or sink current. The decoupling capacitor to AGND (low ESL 0.1 µF) should be placed very close to the pin to minimize stray inductance. VRP needs to be connected to VRN through a low ESL 0.1 µF and a low ESR 10 µF capacitors in parallel. Lower reference voltage. This pin should not be used to source or sink current. The decoupling capacitor to AGND (low ESL 0.1 µF) should be placed very close to the pin to minimize stray inductance. VRN needs to be connected to VRP through a low ESL 0.1 µF and a low ESR 10 µF capacitors in parallel. Common mode voltage The decoupling capacitor to AGND (low ESL 0.1 µF) should be placed as close to the pin as possible to minimize stray inductance. It is recommended to use VRM to provide the common mode voltage for the differential analog inputs. Internal reference voltage output / External reference voltage input. By default, this pin is the output for the internal 1.2V voltage reference. This pin should not be used to sink or source current and should be decoupled to AGND with a 0.1 µF, low ESL capacitor. The decoupling capacitors should be placed as close to the pins as possible to minimize inductance and optimize ADC performance. The decoupling capacitor should not be larger than 0.1 µF, otherwise dynamic performance after power-up calibration can decrease due to the extended VREF settling time. This pin can also be used as the input for a low noise external reference voltage. The output impedance for the internal reference at this pin is 9kΩ and this can be overdriven provided the impedance of the external source is < 9kΩ. Careful decoupling is just as essential when an external reference is used. The 0.1 µF low ESL decoupling capacitor should be placed as close to this pin as possible. The default Input differential voltage swing is equal to 2 * VREF, although this can be changed through the SPI. Differential clock input pins. DC biasing is provided internally. For singleended clock mode, drive CLK+ through AC coupling while decoupling CLK- pin to AGND. Serial Clock. Serial data is shifted into and out of the device synchronous with this clock signal. Serial Data In/Out. Serial data is shifted into the device on this pin while the CSB signal is asserted and data input mode is selected. Serial data is shifted out of the device on this pin while CSB is asserted and data output mode is selected. Serial Chip Select. When this signal is asserted SCLK is used to clock input or output serial data on the SDIO pin. When this signal is deasserted, the SDIO pin is a high impedence and the input data is ignored. Name Type Function and Connection 7, 8 10, 11 Output 5, 6 12, 13 VRNI VRNQ Output 2 16 VRMI VRMQ Output 9 VREF Output/Input 26 25 DIGITAL I/O 23 CLK+ CLK− Input Input SCLK Input 24 SDIO Input/Output 27 CSB Input www.national.com 4 ADC16DV160 Pin(s) Name D1/0+/-Q to D15/14+/-Q D1/0+/-I to D15/14+/-I Type Function and Connection LVDS Data Output. The 16-bit digital output of the data converter is provided on these ports in a dual data rate manner. A 100Ω termination resistor must be placed between each pair of differential signals at the far end of the transmission line. The odd bit data is output first and should be captured first when de-interleaving the data. Output Clock. This pin is used to clock the output data. It has the same frequency as the sampling clock. One word of data is output in each cycle of this signal. A 100Ω termination resistor must be placed between the differential clock signals at the far end of the transmission line. The falling edge of this signal should be used to capture the odd bit data (D15, D13, D11…D1). The rising edge of this signal should be used to capture the even bit data (D14, D12, D10…D0). 3.0V Analog Power Supply. These pins should be connected to a quiet source and should be decoupled to AGND with 0.1 µF capacitors located close to the power pins. 3.0V Analog Power Supply. These pins should be connected to a quiet source and should be decoupled to AGND with 0.1 µF capacitors located close to the power pins. Analog Ground Return. Pin 0 is the exposed pad on the bottom of the package. The exposed pad must be connected to the ground plane to ensure rated performance. Output Driver Power Supply. This pin should be connected to a quiet voltage source and be decoupled to DRGND with a 0.1 µF capacitor close to the power pins. Output Driver Ground Return. 28 - 43 61 - 46 Output 44 45 OUTCLK+/- Output POWER SUPPLIES 4, 14, 22, 64 VA3.0 Analog Power 1 17 VA1.8 Analog Power 0, 3, 15, 18, 21, 65, 68 AGND Analog Ground 62 63 VDR DRGND Analog Power Ground 5 www.national.com ADC16DV160 Absolute Maximum Ratings (Notes 1, 2) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage (VA3.0) Supply Voltage (VA1.8, V, VDR) Voltage at any Pin except OUTCLK, CLK, VIN, CSB, SCLK, SDIO, D15/14-D1/0 Voltage at CLK, VIN Pins Voltage at D15/14-D1/0, OUTCLK, CSB, SCLK, SDIO Pins Input Current at any Pin Storage Temperature Range Maximum Junction Temp (TJ) Thermal Resistance (θJA) Thermal Resistance (θJC) ESD Rating Machine Model Human Body Model −0.3V to 4.2V −0.3V to 2.35V −0.3V to (VA3.0 +0.3V) (Not to exceed 4.2V) -0.3V to (VA1.8 +0.3V) (Not to exceed 2.35V) 0.3V to (VDR + 0.3V) (Not to exceed 2.35V) 5 mA -65°C to +150°C +150°C 19.1°C/W 1.0°C/W 200V 2000V Operating Ratings Specified Temperature Range: 3.0V Analog Supply Voltage Range: (VA3.0) 1.8V Supply Voltage Range: VA1.8, VAD1.8, VDR Clock Duty Cycle -40°C to +85°C +2.7V to +3.6V +1.7V to +1.9V 30/70 % Electrical Characteristics Unless otherwise specified, the following specifications apply: VA3.0 = 3.0V, VA1.8 = 1.8V, VDR = 1.8V, Differential sinusoidal clock, fCLK = 160 MSPS at 2.8 VPP, AIN = -1dBFS, LVDS Rterm = 100Ω, CL = 5 pF. Typical values are for TA = 25°C. Boldface limits apply for TA = TMIN to TMAX. All other limits apply for TA = +25°C, unless otherwise noted. Symbol Parameter Resolution with No Missing Codes INL DNL PGE NGE VOFF Integral Non Linearity Differential Non Linearity Positive Gain Error Negative Gain Error Offset Error (VIN+ = VIN−) Under Range Output Code Over Range Output Code REFERENCE AND ANALOG INPUT CHARACTERISTICS VCM VRM VREF Common Mode Input Voltage Reference Ladder Midpoint Output Voltage Internal Reference Voltage Differential Analog Input Range Internal Reference, default input range is selected VRM is the common mode reference voltage VRM ±0.05 1.15 1.20 2.4 V V V VPP ±1.5 ±0.45 −4.2 3.7 0.12 0 65535 0 65535 Conditions Typical Limits 16 Units Bits LSB LSB %FS %FS %FS STATIC CONVERTER CHARACTERISTICS www.national.com 6 ADC16DV160 Dynamic Converter Electrical Characteristics Unless otherwise specified, the following specifications apply: VA3.0 = 3.0V, VA1.8 = 1.8V, VDR = 1.8V, Differential sinusoidal clock, FCLK = 160 MSPS at 2.8 VPP, AIN = -1dBFS, LVDS RTERM = 100Ω, CL = 5 pF. Typical values are for TA = 25°C. Boldface limits apply for TA = TMIN to TMAX. All other limits apply for TA = +25°C, unless otherwise noted. Symbol SNR Parameter Signal-to-Noise Ratio Conditions Fin = 30 MHz at −1dBFS Fin = 197 MHz at −1dBFS Fin = 197 MHz at −7dBFS SFDR Single-tone Spurious Free Dynamic Range (Note 9) Total Harmonic Distortion Second-order Harmonic (Note 9) Third-order Harmonic (Note 9) Fin = 30 MHz at −1dBFS Fin = 197 MHz at −1dBFS Fin = 197 MHz at −7dBFS Fin = 197 MHz at −1dBFS Fin = 197 MHz at −7dBFS Fin = 197 MHz at −1dBFS Fin = 197 MHz at −7dBFS Fin = 197 MHz at −1dBFS Fin = 197 MHz at −7dBFS Typ 78.5 76.3 77.3 95 91.2 99 −90 −96 −92 −99 −96 −105 97.3 102 1.4 103 Limits Units dBFS dBFS dBFS dBFS dBFS dBFS dBFS dBFS dBFS dBFS dBFS dBFS dBFS dBFS GHz dBFS THD H2 H3 SPUR Worst Harmonic or Spurious Tone excluding H2 Fin = 197 MHz at −1dBFS and H3 Fin = 197 MHz at −7dBFS Full Power Bandwidth Crosstalk -3dB Point 32.5 MHz tested channel 102 MHz other channel Logic and Power Supply Electrical Characteristics Unless otherwise specified, the following specifications apply: VA3.0 = 3.0V, VA1.8 = 1.8V, VDR = 1.8V, Differential sinusoidal clock, FCLK = 160 MSPS at 2.8 VPP, AIN = -1dBFS, LVDS RTERM = 100Ω, CL = 5 pF. Typical values are for TA = 25°C. Boldface limits apply for TA = TMIN to TMAX. All other limits apply for TA = +25°C, unless otherwise noted. Symbol Parameter Conditions Typical Limits Units (Limits) mA mA mA mW mW mW mW V (min) V (max) µA µA pF 1.2 0.4 −10 10 V (min) V (max) mA POWER SUPPLY CHARACTERISTICS IA3.0 IA1.8 IDR Analog 3.0V Supply Current Analog 1.8V Supply Current Output Driver Supply Current Core Power Consumption Driver Power Consumption Power Consumption in Power Down State DIGITAL INPUT CHARACTERISTICS (SCLK, SDIO, CSB) VIH VIL IIN1 IIN0 CIN VOH VOL +ISC −ISC Logical “1” Input Voltage Logical “0” Input Voltage Logical “1” Input Current Logical “0” Input Current Digital Input Capacitance Logical “1” Output Voltage Logical “0” Output Voltage Output Short Circuit Source Current Output Short Circuit Source Current IOUT = 0.5 mA, VDR = 1.8V IOUT = 1.6 mA, VDR = 1.8V VOUT = 0V VOUT = VDR VDR = 1.9V VDR = 1.7V 1.25 0.45 10 −10 5 Full Operation (Note 11) Full Operation (Note 11) Full Operation (Note 11) VA3.0 + VA1.8 power per channel VDR power; Fin = 5MHz Rterm = 100Ω Power down state, no external clock Sleep state, no external clock 332 103 66 591 118 4.4 60 DIGITAL OUTPUT CHARACTERISTICS (SDIO) 7 www.national.com ADC16DV160 LVDS Electrical Characteristics Unless otherwise specified, the following specifications apply: VA3.0 = 3.0V, VA1.8 = 1.8V, VDR = 1.8V, Differential sinusoidal clock, FCLK = 160 MSPS at 2.8 VPP, AIN = -1dBFS, LVDS RTERM = 100Ω, CL = 5 pF. Typical values are for TA = 25°C. Boldface limits apply for TA = TMIN to TMAX. All other limits apply for TA = +25°C, unless otherwise noted. Symbol VOD VOS Parameter Output Differential Voltage Output Offset Voltage Conditions 100Ω Differential Load 100Ω Differential Load Min 200 1.15 Typ 250 1.20 Max 300 1.25 Units mV V LVDS DC SPECIFICATIONS (Apply to pins D0 to D15, OUTCLK) Timing Specifications Unless otherwise specified, the following specifications apply: VA3.0 = +3.0V, VA1.8 = VAD1.8 = VDR = +1.8V, fCLK = 160 MSPS at 2.8 VPP, AIN = -1dBFS, LVDS RTERM = 100 Ω, CL = 5 pF. Typical values are for TA = 25°C. Boldface limits apply for TMIN ≤ TA ≤ TMAX. All other limits apply for TA = 25°C, unless otherwise noted. Parameter Input Clock Frequency (FCLK) Input Clock Frequency (FCLK) Input Clock Amplitude Data Output Setup Time (TSU) (Note 10) Data Output Hold Time (TH) (Note 10) LVDS Rise/Fall Time (tR, tF) Pipeline Latency Aperture Jitter Power-Up Time Power-Down Recovery Time Sleep Recovery Time From assertion of Power to specified level of performance. From de-assertion of power down mode to output data available. From de-assertion of sleep mode to output data available. Measured at each pin (CLK+, CLK-). Differential clock is 2.8 Vpp (typ) Measured @ VOD/2; FCLK = 160 MHz. Measured @ VOD/2; FCLK = 160 MHz. CL= 5pF to GND, RL= 100Ω 1 1.4 1.69 1.55 270 11.5 80 0.5+ 103*(222+217)/FCLK 0.1+ 103*(219+217)/FCLK 100 0.85 1.7 Conditions Typ Limits 160 Units MHz MHz (min) VPP (min) VPP (max) ns (min) ns (min) ps (min) ps (max) Clock Cycles fs rms ms ms μS Unless otherwise specified, the following specifications apply: VA3.0 = 3.0V, VA1.8 = VAD1.8 = VDR = 1.8V, fCLK = 160 MSPS at 2.8 VPP, AIN = -1dBFS, LVDS RTERM = 100Ω, CL = 5 pF. Typical values are for TA = 25°C. Boldface limits apply for TMIN ≤ TA ≤ TMAX. All other limits apply for TA = 25°C, unless otherwise noted. Symbol fSCLK tPH tPL tSSU tSH tODZ tOZD tOD tCSS tCSH tIAG Parameter Serial Clock Frequency SCLK Pulse Width - High SCLK Pulse Width - Low SDI Setup Time SDI Hold Time SDO Driven-to-Tri-State Time SDO Tri-State-to-Driven Time SDO Output Delay Time CSB Setup Time CSB Hold Time Inter-access Gap Minimum time CSB must be deasserted between accesses Conditions fSCLK = 1 / tP % of SCLK Period % of SCLK Period Typ Max 20 40 60 40 60 5 5 5 5 15 5 5 30 Units MHz (max) % (min) % (max) % (min) % (max) ns (min) ns (min) ns (max) ns (max) ns (max) ns (min) ns (min) ns (min) www.national.com 8 ADC16DV160 Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is guaranteed to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test conditions. Operation of the device beyond the maximum Operating Ratings is not recommended. Note 2: All voltages are measured with respect to GND = AGND = DRGND = 0V, unless otherwise specified. Note 3: When the input voltage at any pin exceeds the power supplies (that is, VIN < AGND, or VIN > VA), the current at that pin should be limited to ±5 mA. The ±50 mA maximum package input current rating limits the number of pins that can safely exceed the power supplies with an input current of ±5mA to 10. Note 4: Human Body Model is 100 pF discharged through a 1.5 kΩ resistor. Machine Model is 220 pF discharged through 0 Ω. Note 5: Reflow temperature profiles are different for lead-free and non-lead-free packages. Note 6: Typical figures are at TA = 25°C and represent most likely parametric norms at the time of product characterization. The typical specifications are not guaranteed. Note 7: The inputs are protected as shown below. Input voltage magnitudes above VA3.0 or below GND will not damage this device, provided current is limited per (Note 3). However, errors in the A/D conversion can occur if the input goes above 2.6V or below GND as described in the Operating Ratings section. 30101457 Note 8: The input capacitance is the sum of the package/pin capacitance and the sample and hold circuit capacitance. Note 9: This parameter is specified in units of dBFS – dB relative to the ADC's input full-scale voltage. Note 10: ) This parameter is a function of the CLK frequency - increasing directly as the frequency is lowered. Note 11: This parameter is guaranteed only at 25°C. For power dissipation over temperature range, refer to Core Power vs. Temperature plot in Typical Performance Characteristics, Dynamic Performance. Timing Diagrams 30101403 FIGURE 1. Digital Output Timing 9 www.national.com ADC16DV160 30101411 FIGURE 2. SPI Clock Timing 30101412 FIGURE 3. SPI Data In Timing 30101413 FIGURE 4. SPI Data Output Timing 30101414 FIGURE 5. SPI Chip Select Timing www.national.com 10 ADC16DV160 Specification Definitions APERTURE DELAY is the time after the falling edge of the clock to when the input signal is acquired or held for conversion. APERTURE JITTER (APERTURE UNCERTAINTY) is the variation in aperture delay from sample to sample. Aperture jitter manifests itself as noise in the output. CLOCK DUTY CYCLE is the ratio of the time during one cycle that a repetitive digital waveform is high to the total time of one period. The specification here refers to the ADC clock input signal. COMMON MODE VOLTAGE (VCM) is the common DC voltage applied to both input terminals of the ADC. CONVERSION LATENCY is the number of clock cycles between initiation of conversion and the time when data is presented to the output driver stage. Data for any given sample is available at the output pins the Pipeline Delay plus the Output Delay after the sample is taken. New data is available at every clock cycle, but the data lags the conversion by the pipeline delay. DIFFERENTIAL NON-LINEARITY (DNL) is the measure of the maximum deviation from the ideal step size of 1 LSB. FULL POWER BANDWIDTH is a measure of the frequency at which the reconstructed output fundamental drops 3 dB below its low frequency value for a full scale input. GAIN ERROR is the deviation from the ideal slope of the transfer function. It can be calculated as: Gain Error = Positive Full Scale Error − Negative Full Scale Error It can also be expressed as Positive Gain Error and Negative Gain Error, which are calculated as: PGE = Positive Full Scale Error - Offset Error NGE = Offset Error - Negative Full Scale Error INTEGRAL NON LINEARITY (INL) is a measure of the deviation of each individual code from a best fit straight line. The deviation of any given code from this straight line is measured from the center of that code value. INTERMODULATION DISTORTION (IMD) is the creation of additional spectral components as a result of two sinusoidal frequencies being applied to the ADC input at the same time. It is defined as the ratio of the power in the intermodulation products to the total power in the original frequencies. IMD is usually expressed in dBFS. LSB (LEAST SIGNIFICANT BIT) is the bit that has the smallest value or weight of all bits. This value is VFS/2n, where “VFS” is the full scale input voltage and “n” is the ADC resolution in bits. MISSING CODES are those output codes that will never appear at the ADC outputs. The ADC16DV160 is guaranteed not to have any missing codes. MSB (MOST SIGNIFICANT BIT) is the bit that has the largest value or weight. Its value is one half of full scale. NEGATIVE FULL SCALE ERROR is the difference between the actual first code transition and its ideal value of ½ LSB above negative full scale. OFFSET ERROR is the difference between the two input voltages (VIN+ – VIN-) required to cause a transition from code 32767LSB and 32768LSB with offset binary data format. PIPELINE DELAY (LATENCY) See CONVERSION LATENCY. POSITIVE FULL SCALE ERROR is the difference between the actual last code transition and its ideal value of 1½ LSB below positive full scale. POWER SUPPLY REJECTION RATIO is a measure of how well the ADC rejects a change in the power supply voltage. PSRR is the ratio of the Full-Scale output of the ADC with the supply at the minimum DC supply limit to the Full-Scale output of the ADC with the supply at the maximum DC supply limit, expressed in dB. SIGNAL TO NOISE RATIO (SNR) is the ratio, expressed in dB, of the power of input signal to the total power of all other spectral components below one-half the sampling frequency, not including harmonics and DC. SIGNAL TO NOISE AND DISTORTION (SINAD) Is the ratio, expressed in dB, of the power of the input signal to the total power of all of the other spectral components below half the clock frequency, including harmonics but excluding DC. SPURIOUS FREE DYNAMIC RANGE (SFDR) is the difference, expressed in dB, between the power of input signal and the peak spurious signal power, where a spurious signal is any signal present in the output spectrum that is not present at the input. TOTAL HARMONIC DISTORTION (THD) is the ratio, expressed in dB, of the total power of the first seven harmonic to the input signal power. THD is calculated as: where f12 is the power of the fundamental frequency and f22 through f102 are the powers of the first nine harmonics in the output spectrum. SECOND HARMONIC DISTORTION (2ND HARM or H2) is the difference expressed in dB, from the power of its 2nd harmonic level to the power of the input signal. THIRD HARMONIC DISTORTION (3RD HARM or H3) is the difference expressed in dB, from the power of the 3rd harmonic level to the power of the input signal. 11 www.national.com ADC16DV160 Functional Description Operating on dual +1.8V and +3.0V supplies, the ADC16DV160 digitizes a differential analog input signal to 16 bits, using a differential pipelined architecture with error correction circuitry and an on-chip sample-and-hold circuit to ensure maximum performance. The user has the choice of using an internal 1.2V stable reference, or using an external 1.2V reference. The internal 1.2V reference has a high output impedance of > 9 kΩ and can be easily over-driven by an external reference. A 3-wire SPI-compatible serial interface facilitates programming and control of the ADC16DV160. ADC Architecture The ADC16DV160 architecture consists of a dual channel highly linear and wide bandwidth sample-and-hold circuit, followed by a switched capacitor pipeline ADC. Each stage of the pipeline ADC consists of low resolution flash sub-ADC and an inter-stage multiplying digital-to-analog converter (MDAC), which is a switched capacitor amplifier with a fixed stage signal gain and DC level shifting circuits. The amount of DC level shifting is dependent on sub-ADC digital output code. A 16-bit final digital output is the result of the digital error correction logic, which receives the digital output of each stage including redundant bits to correct offset error of each sub-ADC. Applications Information 1.0 OPERATING CONDITIONS We recommend that the following conditions be observed for operation of the ADC16DV160: 2.7V ≤ VA3.0 ≤ 3.6V 1.7V ≤ VA1.8 ≤ 1.9V 1.7V ≤ VDR ≤ 1.9V 1 MSPS ≤ FCLK ≤ 160 MSPS VREF ≤ 1.2V VCM = 1.15V (from VRM) 2.0 ANALOG INPUTS The analog input circuit of the ADC16DV160 is a differential switched capacitor sample-and-hold circuit (see Figure 6) that provides optimum dynamic performance wide input frequency range with minimum power consumption. The clock signal alternates sample mode (QS) and hold mode (QH). An integrated low jitter duty cycle stabilizer ensures constant optimal sample and hold time over a wide range of input clock duty cycle. The duty cycle stabilizer is always turned on during normal operation. During sample mode, analog signals (VIN+, VIN-) are sampled across two sampling capacitors (CS) while the amplifier in the sample-and-hold circuit is idle. The dynamic performance of the ADC16DV160 is likely determined during sampling mode. The sampled analog inputs (VIN+, VIN-) are held during hold mode by connecting input side of the sampling capacitors to output of the amplifier in the sample-and-hold circuit while driving pipeline ADC core. The signal source, which drives the ADC16DV160, is recommended to have a source impedance less than 100Ω over a wide frequency range for optimal dynamic performance. A shunt capacitor can be placed across the inputs to provide high frequency dynamic charging current during sample mode and also absorb any switching charge coming from the ADC16DV160. A shunt capacitor can be placed across each input to GND for similar purpose. Smaller physical size and low ESR and ESL shunt capacitors are recommended. The value of shunt capacitance should be carefully chosen to optimize the dynamic performance at specific input frequency range. Larger value shunt capacitors can be used for lower input frequencies, but the value has to be reduced at high input frequencies. Balancing impedance at positive and negative input pin over entire signal path must be ensured for optimal dynamic performance. 30101406 FIGURE 6. Simplified Switched-Capacitor Sample-and-hold Circuit www.national.com 12 ADC16DV160 Input Common Mode The analog inputs of the ADC16DV160 are not internally dc biased and the range of input common mode is very narrow. Hence it is highly recommended to use the common mode voltage (VRM, typically 1.15V) as input common mode for optimal dynamic performance regardless of DC and AC coupling applications. Input common mode signal must be decoupled with low ESL 0.1 μF input bias resistors to minimize noise performance degradation due to any coupling or switching noise between the ADC16DV160 and input driving circuit. Driving Analog Inputs For low frequency applications, either a flux or balun transformer can convert single-ended input signals into differential and drive the ADC16DV160 without additive noise. An example is shown in Figure 7. The VRM pin is used to bias the input common mode by connecting the center tap of the transformer’s secondary ports. A flux transformer is used for this example, but AC coupling capacitors enable the use of a balun type transformer. 30101407 FIGURE 7. Transformer Drive Circuit for Low Input Frequency Transformers act as band pass filters. The lower frequency limit is set by saturation at frequencies below a few MHz and parasitic resistance and capacitance set the upper frequency limit. The transformer core will be saturated with excessive signal power and it causes distortion as the equivalent load termination becomes heavier at high input frequencies. This is a reason to reduce shunt capacitors for high IF sampling applications to balance the amount of distortion caused by the transformer and charge kick-back noise from the device. As input frequency goes higher with the input network in Figure 7, amplitude and phase unbalance increase between positive and negative inputs (VIN+ and VIN-) due to the inherent impedance mismatch between the two primary ports of the transformer since one is connected to the signal source and the other is connected to GND. Distortion increases as a result. The cascaded transmission line (balun) transformers in Figure 8 can be used for high frequency applications like high IF sampling base station receive channels. The transmission line transformer has less stray capacitance between primary and secondary ports and so the impedance mismatch at the secondary ports is effectively less even with the given inherent impedance mismatch on the primary ports. Cascading two transmission line transformers further reduces the effective stray capacitance from the secondary of ports of the secondary transformer to primary ports of first transformer, where the impedance is mismatched. A transmission line transformer, for instance MABACT0040 from M/A-COM, with a center tap on the secondary port can further reduce amplitude and phase mismatch. 30101408 FIGURE 8. Transformer Drive Circuit for High Input Frequency Equivalent Input Circuit and Its S11 The input circuit of the ADC16DV160 during sample mode is a differential switched capacitor as shown in Figure 9. The bottom plate sampling switch is bootstrapped in order to reduce its turn on impedance and its variation across input signal amplitude. Bottom plate sampling switches, and top plate sampling switch are all turned off during hold mode. The sampled analog input signal is processed through the follow13 ing pipeline ADC core. The equivalent impedance changes drastically between sample and hold mode and a significant amount of charge injection occurs during the transition between the two operating modes. Distortion and SNR heavily rely on the signal integrity, impedance matching during sample mode and charge injection due to the sampling switches. www.national.com ADC16DV160 30101409 FIGURE 9. Input Equivalent Circuit The simulated S11 of the input circuit of the ADC16DV160 is shown in Figure 10. (Measured data will be provided in a future datasheet revision. Note that the simulated S11 normally closely matches the measured S11.) Up to 500 MHz, it is predominantly capacitive loading with small stray resistance and inductance as shown in Figure 10. An appropriate resistive termination at a given input frequency band has to be added to improve signal integrity. Any shunt capacitor on the analog input pin deteriorates signal integrity but it provides high frequency charge to absorb the charge injected by the sampling switches. An optimal shunt capacitor is dependent on input signal frequency as well as the impedance characteristic of the analog input signal path including components like transformers, termination resistors, and AC coupling capacitors. 30101419 FIGURE 10. Simulated ADC16DV160 Input S11 3.0 CLOCK INPUT CONSIDERATIONS Clock Input Modes The ADC16DV160 provides a low additive jitter differential clock receiver for optimal dynamic performance over a wide input frequency range. The input common mode of the clock receiver is internally biased at VA1.8/2 through a 10 kΩ resistor as shown in Figure 11. Normally the external clock input should be AC-coupled. It is possible to DC-couple the clock input, but the common mode (average voltage of CLK+ and CLK-) must not be higher than VA1.8/2 to prevent substantial www.national.com 14 tail current reduction leading to lowered jitter performance. CLK+ and CLK- should never be lower than AGND. A high speed back-to-back diode connected between CLK+ and CLK- can limit the maximum swing, but this could cause signal integrity concerns when the diode turns on and reduces the load impedance instantaneously. The preferred differential transformer coupled clocking approach is shown in Figure 12. A 0.1 μF decoupling capacitor on the center tap of the secondary of a flux type transformer stabilizes clock input common mode. Differential clocking in- ADC16DV160 creases the maximum amplitude of the clock input at the pins 6dB vs. the singled-ended circuit shown in Figure 13. The clock amplitude is recommended to be as large as possible while CLK+ and CLK- both never exceed the supply rails of VA1.8 and AGND. With the equivalent input noise of the differential clock receiver shown in Figure 11, a larger clock amplitude at CLK+ and CLK- pins increases its slope around the zero-crossing point so that higher signal-to-noise results. 30101433 FIGURE 13. Singled-Ended 1.8V Clocking, Capacitive AC Coupled Duty Cycle Stabilizer The highest operating speed with optimal performance can only be achieved with a 50% clock duty cycle because the switched-capacitor circuit of the ADC16DV160 is designed to have equal amount of settling time between each stage. The maximum operating frequency could be reduced accordingly when the clock duty cycle departs from 50%. The ADC16DV160 contains a duty cycle stabilizer that adjusts the non-sampling (rising) clock edge to make the duty cycle of the internal clock 50% for a 30-to-70% input clock duty cycle. The duty cycle stabilizer is always on because the noise and distortion performance are not affected at all. It is not recommended to use the ADC16DV160 at clock frequencies less than 1 MSPS where the feedback loop in the duty cycle stabilizer becomes unstable. Clock Jitter vs. Dynamic Performance High speed and high resolution ADCs require a low-noise clock input to ensure full dynamic performance over wide input frequency range. SNR (SNRFin) at a given input frequency (Fin) can be calculated by: 30101431 FIGURE 11. Equivalent Clock Receiver The differential receiver of the ADC16DV160 has an extremely low-noise floor but its bandwidth is also extremely wide. The wide band clock noise folds back into the first Nyquist zone at the ADC output. Increased slope of the input clock lowers the equivalent noise contributed by the differential receiver. A band-pass filter (BPF) with narrow pass band and low insertion loss can be added to the clock input signal path when the wide band noise of the clock source is noticeably large compared to the input equivalent noise of the differential clock receiver. Load termination can be a combination of R and C instead of a pure R. This RC termination can improve the noise performance of the clock signal path by filtering out high frequency noise through a low pass filter. The size of R and C is dependent on the clock rate and slope of the clock input. An LVPECL and/or LVDS driver can also drive the ADC16DV160. However the full dynamic performance of the ADC16DV160 might not be achieved due to the high noise floor of the driving circuit itself especially in high IF sampling applications. 30101434 30101432 FIGURE 12. Differential Clocking, Transformer Coupled A singled-ended clock can drive the CLK+ pin through a 0.1 µF AC coupling capacitor while CLK- is decoupled to AGND through a 0.1 μF capacitor as shown in Figure 13. with a given total noise power (VN2) of an ADC, total rms jitter (Tj), and input amplitude (A) in dBFS. The clock signal path must be treated as an analog signal whenever aperture jitter affects the dynamic performance of the ADC16DV160. Power supplies for the clock drivers have to be separated from the ADC output driver supplies to prevent modulating the clock signal with the ADC digital output signals. Higher noise floor and/or increased distortion/spur may result from any coupling of noise from the ADC digital output signals to the analog input and clock signals. In IF sampling applications, the signal-to-noise ratio is particularly affected by clock jitter as shown in Figure 14. Tj is the integrated noise power of the clock signal divided by the slope of clock signal around the tripping point. The upper limit of the noise integration is independent of applications and set by the bandwidth of the clock signal path. However, the lower limit of the noise integration highly relies on the application. In base station receive channel applications, the lower limit is determined by the channel bandwidth and space from an adjacent channel. 15 www.national.com ADC16DV160 30101435 FIGURE 14. SNR with given Jitter vs. Input Frequency 4.0 CALIBRATION The automatic calibration engine contained within the ADC16DV160 improves dynamic performance and reduces its part-to-part variation. Digital output signals including output clock (OUTCLK+/-) are all logic low while calibrating. The ADC16DV160 is automatically calibrated when the device is powered up. Optimal dynamic performance might not be obtained if the power-up time is longer than the internal delay time (~32 mS @ 160 MSPS clock rate). In this case, the ADC16DV160 can be re-calibrated by asserting and then deasserting power down mode. Re-calibration is recommended whenever the operating clock rate changes. 5.0 VOLTAGE REFERENCE A stable and low-noise voltage reference and its buffer amplifier are built into the ADC16DV160. The input full scale is two times VREF, which is the same as VBG (the on-chip bandgap output with a 9 kΩ output impedance) as well as VRP - VRN as shown in Figure 15. The input range can be adjusted by changing VREF either internally or externally. An external reference with low output impedance can easily overdrive the VREF pin. The default VREF is 1.2V. The input common mode voltage (VRM) is a fixed voltage level of 1.15V. Maximum SNR can be achieved at the maximum input range where VREF = 1.2V. Although the ADC16DV160's dynamic and static performance is optimized at a VREF of 1.2V, reducing VREF can improve SFDR performance by sacrificing some of the ADC16DV160's SNR performance. www.national.com 16 ADC16DV160 30101436 FIGURE 15. Internal References and their Decoupling Reference Decoupling It is highly recommended to place the external decoupling capacitors connected to VRP, VRN, VRM and VREF pins as close to the pins as possible. The external decoupling capacitors should have minimal ESL and ESR. During normal operation, inappropriate external decoupling with large ESL and/or ESR capacitors increase the settling time of the ADC core and result in lower SFDR and SNR performance. The VRM pin may be loaded up to 1mA for setting input common mode. The remaining pins should not be loaded. Smaller capacitor values might result in degraded noise performance. The decoupling capacitor on the VREF pin must not exceed 0.1 μF. Additional decoupling on this pin will cause improper calibration during power-up. All the reference pins except VREF have a very low output impedance. Driving these pins via a lowoutput impedance external circuit for a long time period may damage the device. When the VRM pin is used to set the input common mode level via transformer, a smaller series resistor should be placed on the signal path to isolate any switching noise between the ADC core and input signal. The series resistor introduces a voltage error between VRM and VCM due to charge injection while the sampling switches are toggling. The series resistance should not be larger than 50Ω. All grounds associated with each reference and analog input pin should be connected to a solid and quiet ground on the PC board. Coupling noise from digital outputs and their supplies to the reference pins and their ground can cause degraded SNR and SFDR performance. 6.0 LAYOUT AND GROUNDING Proper grounding and proper routing of all signals are essential to ensure accurate conversion. Maintaining separate ana17 log and digital areas of the board, with the ADC16DV160 between these areas, is required to achieve the specified performance. Even though LVDS outputs reduce ground bounce, the positive and negative signal path have to be well matched, and their traces should be kept as short as possible. It is recommend to place an LVDS repeater between the ADC16DV160 and digital data receiver block to prevent coupling noise from the receiving block when the length of the traces are long or the noise level of the receiving block is high. Capacitive coupling between the typically noisy digital circuitry and the sensitive analog circuitry can lead to poor performance. The solution is to keep the analog circuitry separated from the digital circuitry, and to keep the clock line as short as possible. Since digital switching transients are composed largely of high frequency components, total ground plane copper weight will have little effect upon the logic-generated noise. Because of the skin effect, the total surface area is more important than its thickness. Generally, analog and digital lines should not cross. However whenever it is inevitable, make sure that these lines are crossing each other at 90° to minimize cross talk. Digital output and output clock signals must be separated from analog input, references and clock signals unconditionally to ensure the maximum performance from the ADC16DV160. Any coupling may result in degraded SNR and SFDR performance especially for high IF applications. Be especially careful with the layout of inductors and transformers. Mutual inductance can change the characteristics of the circuit in which they are used. Inductors and transformers should not be placed side by side, even with just a small part www.national.com ADC16DV160 of their bodies beside each other. For instance, place transformers for the analog input and the clock input at 90° to one another to avoid magnetic coupling. It is recommended to place the transformers of the input signal path on the top side, and the transformer for the clock signal path on the bottom side. Every critical analog signal path like analog inputs and clock inputs must be treated as a transmission line and should have a solid ground return path with a small loop area. The analog input should be isolated from noisy signal traces to avoid coupling of spurious signals into the input. Any external component (e.g., a filter capacitor) connected between the converter’s input pins and ground or to the reference pins and ground should be connected to a very clean point in the ground plane. All analog circuitry (input amplifiers, filters, reference components, etc.) should be placed in the analog area of the board. All digital circuitry and dynamic I/O lines should be placed in the digital area of the board. The ADC16DV160 should be between these two areas. Furthermore, all components in the reference circuitry and the input signal chain that are connected to ground should be connected together with short traces and enter the ground plane at a single, quiet point. All ground connections should have a low inductance path to ground. The ground return current path can be well managed when the supply current path is precisely controlled and the ground layer is continuous and placed next to the supply layer. This is because of the proximity effect. A ground return current path with a large loop area will cause electro-magnetic coupling and results in poor noise performance. Note that even if there is a large plane for a current path, the high-frequency return current path is not spread evenly over the large plane, but only takes the path with lowest impedance. Instead of a large plane, using a thick trace for supplies makes it easy to control the return current path. It is recommended to place the supply next to the GND layer with a thin dielectric for a smaller ground return loop. Proper location and size of decoupling capacitors provides a short and clean return current path. 7.0 SUPPLIES AND THEIR SEQUENCE There are three supplies for the ADC16DV160: one 3.0V supply VA3.0 and two 1.8V supplies VA1.8 and VDR. It is recom- mended to separate VDR from VA1.8 supplies, any coupling from VDR to the rest of the supplies and analog signals could cause lower SFDR and noise performance. When VA1.8 and VDR are both from the same supply source, coupling noise can be mitigated by adding a ferrite-bead on the VDR supply path. Different decoupling capacitors can be used to provide current over wide frequency range. The decoupling capacitors should be located close to the point of entry and close to the supply pins with minimal trace length. A single ground plane is recommended because separating ground under the ADC16DV160 could cause an unexpected long return current path. The VA3.0 supply must turn on before VA1.8 and/or VDR reaches a diode turn-on voltage level. If this supply sequence is reversed, an excessive amount of current will flow through the VA3.0 supply. The ramp rate of the VA3.0 supply must be kept less than 60 V/mS (i.e., 60 μS for 3.0V supply) in order to prevent excessive surge current through ESD protection devices. 8.0 SERIAL CONTROL INTERFACE The ADC16DV160 has a serial control interface that allows access to the control registers. The serial interface is a generic 3-wire synchronous interface that is compatible with SPItype interfaces that are used on many microcontrollers and DSP controllers. Each serial interface access cycle is exactly 16 bits long. A register-read or register-write can be accomplished in one cycle. Register space supported by this interface is 64. Figure 16 and Figure 17 show the access protocol used by this interface. Each signal’s function is described below. The SPI must be in a static condition during the normal operation of the ADC16DV160, otherwise the performance of the ADC16DV160 may degrade due to the coupling noise generated by the SPI control signals. When a SPI bus is used for multiple devices on the board, it is recommended to reduce the potential for noise coupling by placing logic buffers between the SPI bus and the ADC16DV160. 30101451 FIGURE 16. Serial Interface Protocol (Write Operation) www.national.com 18 ADC16DV160 30101452 FIGURE 17. Serial Interface Protocol (Read Operation) Signal Descriptions SCLK: Used to register the input date (SDI) on the rising edge; and to source the output data (SDO) on the falling edge. User may disable clock and hold it in the low-state, as long as clock pulse width min. spec is not violated when clock is enabled or disabled. CLB: Chip Select Bar. Each assertion starts a new register access – i.e., the SDATA field protocol is required. CSB should be de-asserted after the 16th clock. If the CSB is de-asserted before the 16th clock, no address or data write will occur. The rising edge captures the address just shifted-in and, in the case of a write operation, writes the addressed register. SDIO: Serial Data. Must observe setup/hold requirements with respect to the SCLK. Each cycle is 16-bit long. • • • • R/W: A value of ‘1’ indicates a read operation, while a value of ‘0’ indicates a write operation Reserved: Reserved for future use. Must be set to 0. ADDR: Up to 64 registers can be addressed. DATA: In a write operation the value in this field will be written to the register addressed in this cycle when CSB is de-asserted. In a read operation this field is ignored. 9.0 FIXED PATTERN MODE The ADC16DV160 provides user defined fixed patterns at digital output pins to check timing and connectivity with the receiving device on the board. The fixed pattern map is shown in Figure 18; there are 6 hard-wired fixed patterns (PATTERN (000) to PATTERN (101)) and 2 user-defined patterns (PATTERN (110) and PATTERN (111)). PATTERN (110) and PATTERN (111) can be written via SPI and all ‘0’s are the default values for both. See Register Map address 0CH through 0FH for the details. 30101453 FIGURE 18. Fixed Pattern Map For flexibility, the user can determine a fixed pattern with a depth of 8 patterns as shown in Figure 19. The user can fill these 8 sequences (SEQ0 – SEQ7) with an arbitrary pattern (PATTERN (000) – PATTERN (111)). See Register Map address 08h through 0Bh below for the details. The default register value for all SEQ0 through SEQ7 sequences is 010, which generates alternating 0xFF and 0x00 at the ADC output as shown in Figure 20. 19 www.national.com ADC16DV160 30101454 FIGURE 19. State Machine Generating Fixed Pattern Sequence 30101455 FIGURE 20. Fixed Pattern at ADC Output with Default SPI Register Values 10.0 SAMPLING EDGE The internal clock divider features allows more flexible design from the perspective of the system clocking scheme. The ADC16DV160 supports divide by 1 or 2 clocking. This feature may cause a potential issue when synchronizing the sample edge of multiple ADCs when the internal clock is divided by 2 from the input clock (CLKIN). The ADC16DV160 samples the analog input signal at the falling edge of the input clock, which will be the falling edge of the internally divided by 2 clock when divide by 2 is configured as shown as dashed lines in Figure 21 below. If there is some timing skew of the SPI control signals and/or input clock between multiple ADCs with this clocking configuration, the sampling edge of some ADC, which is ADC SLAVE I for this example, could be out of phase compared to the ADC MASTER as shown in Figure 21. The sampling edge of the non-synchronized ADC can be synchronized if the internal clock can be inverted through some control bit. This sampling edge flipping function is provided by the ADC16DV160 via SPI. See the SPI Register Map below for the details. 30101456 FIGURE 21. Sampling Edge of Multiple ADCs with Internal Division On www.national.com 20 ADC16DV160 Register Map Note: Accessing unspecified addresses may cause functional failure or damage. All reserved bits must be written with the listed default values. Operation Mode 7 DF Bit 7 6 5 4 Reserved Two's Complement Offset Binary (Default) Addr: 00h 3 R/W 2 Full Scale 1 Default 0 Operation Mode Data Format 1 0 Operation Mode 0 0 0 1 1 0 1 1 Bits (6:5) Bit 4 Bit 3 Bit (2:1) Normal Operation (Default) Sleep Mode. Device is powered down, but it can wake up quickly. Power down mode. Device is powered down at lowest power dissipation. Fixed pattern mode. Device outputs fixed patterns to check connectivity with interfacing components. Reserved. Must be set to 0. Reserved. Must be set to 0. Full scale. Full scale can be adjusted from 1.0 to 2.4VPP. 0 0 1 1 0 1 0 1 1.0VPP 1.5VPP 2.0VPP 2.4VPP (default) Bit 0 Restore Default Register Values. Default values of SPI registers can be restored at the rising edge of this bit. 1 Restore default register values 0 As is (default) Addr: 01h 3 Output Clock Phase R/W 2 1 Reserved 0 Reserved Synchronization Mode 7 6 Sample Phase Bit 7 Clock Divider 5 Reserved 4 Bit 6 Bit 5 Bits (4:2) Bit 1 Bit 0 Sampling Clock Phase. This is for synchronizing sampling edge for multiple devices while the ADC16DV160 is configured at clock divide by 2. 0 Keep sampling edge as is (default). 1 Invert internal clock to adjust sampling edge. Clock divider. Internal operating clock frequency can be programmed either to be divided by 1 or 2. 0 Divide by 1 (default). 1 Divide by 2 Reserved. Must be set to 0. Output Clock Phase Adjustment. User can adjust output clock phase from 31° to 143°. Each 1 LSB increment results in about 16° of output clock phase increase. 0 0 0 31° 0 0 1 47° 0 1 0 63° 0 1 1 79° 1 0 0 95° (default) 1 0 1 111° 1 1 0 127° 1 1 1 143° Reserved. Must be set to 0. Reserved. Must be set to 0. 21 www.national.com ADC16DV160 Fixed Pattern Mode: SEQ0 and SEQ1 7 SEQ1 Bits (7:5) Bits (5:3) Bit 1 Bit 0 Addr: 08h 6 5 SEQ1 4 SEQ1 3 SEQ1 2 SEQ1 1 Reserved 0 R/W SEQ1 Reserved 3 bits pattern code for SEQ3. 010 is the default. 3 bits pattern code for SEQ2. 010 is the default. Reserved, Must be set to 0. Reserved, Must be set to 0. Fixed Pattern Mode: SEQ2 and SEQ3 7 SEQ3 Bits (7:5) Bits (5:3) Bit 1 Bit 0 Addr: 09h 6 5 SEQ3 4 SEQ2 3 SEQ2 2 SEQ2 1 Reserved 0 R/W SEQ3 Reserved 3 bits pattern code for SEQ3. 010 is the default. 3 bits pattern code for SEQ2. 010 is the default. Reserved, Must be set to 0. Reserved, Must be set to 0. Fixed Pattern Mode: SEQ4 and SEQ5 7 SEQ5 Bits (7:5) Bits (5:3) Bit 1 Bit 0 Addr: 0Ah 6 5 SEQ5 4 SEQ4 3 SEQ4 2 SEQ4 1 Reserved 0 R/W SEQ5 Reserved 3 bits pattern code for SEQ5. 010 is the default. 3 bits pattern code for SEQ4. 010 is the default. Reserved, Must be set to 0. Reserved, Must be set to 0. Fixed Pattern Mode: SEQ7 and SEQ8 7 SEQ7 Bits (7:5) Bits (5:3) Bit 1 Bit 0 Addr: 0Bh 6 5 SEQ7 4 SEQ6 3 SEQ6 2 SEQ6 1 Reserved 0 R/W SEQ7 Reserved 3 bits pattern code for SEQ7. 010 is the default. 3 bits pattern code for SEQ6. 010 is the default. Reserved, Must be set to 0. Reserved, Must be set to 0. Fixed Pattern Mode: LSB PATTERN 7 6 D Bits (7:5) D Addr: 0Ch 5 D 4 D 3 D 2 D 1 D 0 D R/W 8 LSBs of a fixed pattern for Sequence >110> All '0' for default. Fixed Pattern Mode: MSB PATTERN 7 6 D Bits (7:5) D Addr: 0Dh 5 D 4 D 3 D 2 D 1 D 0 D R/W 8 MSBs of a fixed pattern for Sequence >110> All '0' for default. www.national.com 22 ADC16DV160 Fixed Pattern Mode: LSB PATTERN 7 6 D Bits (7:5) D Addr: 0Eh 5 D 4 D 3 D 2 D 1 D 0 D R/W 8 LSBs of a fixed pattern for Sequence >111> All '0' for default. Fixed Pattern Mode: MSB PATTERN 7 6 D Bits (7:5) D Addr: 0Fh 5 D 4 D 3 D 2 D 1 D 0 D R/W 8 MSBs of a fixed pattern for Sequence >111> All '0' for default. 23 www.national.com ADC16DV160 Physical Dimensions inches (millimeters) unless otherwise noted 68-Lead LLP Package Ordering Number ADC16DV160CILQ NS Package Number LQA68A www.national.com 24 ADC16DV160 Notes 25 www.national.com ADC16DV160 Dual Channel, 16-Bit, 160 MSPS Analog-to-Digital Converter with DDR LVDS Outputs Notes For more National Semiconductor product information and proven design tools, visit the following Web sites at: Products Amplifiers Audio Clock and Timing Data Converters Interface LVDS Power Management Switching Regulators LDOs LED Lighting Voltage Reference PowerWise® Solutions Temperature Sensors Wireless (PLL/VCO) www.national.com/amplifiers www.national.com/audio www.national.com/timing www.national.com/adc www.national.com/interface www.national.com/lvds www.national.com/power www.national.com/switchers www.national.com/ldo www.national.com/led www.national.com/vref www.national.com/powerwise WEBENCH® Tools App Notes Reference Designs Samples Eval Boards Packaging Green Compliance Distributors Quality and Reliability Feedback/Support Design Made Easy Solutions Mil/Aero PowerWise® Design University Design Support www.national.com/webench www.national.com/appnotes www.national.com/refdesigns www.national.com/samples www.national.com/evalboards www.national.com/packaging www.national.com/quality/green www.national.com/contacts www.national.com/quality www.national.com/feedback www.national.com/easy www.national.com/solutions www.national.com/milaero www.national.com/solarmagic www.national.com/training Serial Digital Interface (SDI) www.national.com/sdi www.national.com/wireless www.national.com/tempsensors SolarMagic™ THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION (“NATIONAL”) PRODUCTS. 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