ADC08351CIMTC

National Semiconductor is now part of Texas Instruments. Search http://www.ti.com/ for the latest technical information and details on our current products and services. ADC08351 8-Bit, 42 MSPS, 40 mW A/D Converter General Description The ADC08351 is an easy to use low power, low cost, small size, 42 MSPS analog-to-digital converter that digitizes signals to 8 bits. The ADC08351 uses an unique architecture that achieves 7.2 Effective Bits with a 4.4 MHz input and 42 MHz clock frequency and 6.8 Effective Bits with a 21 MHz input and 42 MHz clock frequency. Output formatting is straight binary coding. To minimize system cost and power consumption, the ADC08351 requires minimal external components and includes input biasing to allow optional a.c. input signal coupling. The user need only provide a +3V supply and a clock. Many applications require no separate reference or driver components. The excellent dc and ac characteristics of this device, together with its low power consumption and +3V single supply operation, make it ideally suited for many video and imaging applications, including use in portable equipment. Total power consumption is reduced to less than 7 mW in the power-down mode. Furthermore, the ADC08351 is resistant to latch-up and the outputs are short-circuit proof. Fabricated on a 0.35 micron CMOS process, the ADC08351 is offered in TSSOP and LLP (a molded lead frame-based chip-scale package), and is designed to operate over the industrial temperature range of −40˚C to +85˚C. Features n Single +3V Operation n Power Down Feature n TRI-STATE Outputs Key Specifications j Resolution 8 Bits j Maximum Sampling Frequency 42 MSPS (min) j ENOB @ fCLK = 42 MHz, fIN = 4.4 MHz 7.2 Bits (typ) j Guaranteed No Missing Codes j Power Consumption 40 mW (typ); 48 mW (max) (Excluding Reference Current) Applications n n n n n n n n n Video Digitization Digital Still Cameras Set Top Boxes Digital Camcorders Communications Medical Imaging Personal Computer Video CCD Imaging Electro-Optics n Low Input Capacitance n Internal Sample-and-Hold Function Pin Configuration 20-Pin TSSOP 24-Pin LLP (CSP) 10089501 Top View 10089534 Bottom View © 2003 National Semiconductor Corporation DS100895 www.national.com ADC08351 8-Bit, 42 MSPS, 40 mW A/D Converter November 2003 ADC08351 Ordering Information ADC08351CIMTC TSSOP ADC08351CIMTCX TSSOP (tape & reel) ADC08351CILQ LLP (tape & reel - 1, 000 units) ADC08351CILQX LLP (tape & reel - 4, 500 units) ADC08351 Block Diagram 10089502 Pin Descriptions and Equivalent Circuits (LLP pins in parentheses) Pin No. Symbol 17 (17) VIN Analog signal input. Conversion range is 0.5 VP-P to 0.68 VA. 14 (14) VREF Positive reference voltage input. Operating range of this voltage is 0.75V to VA. This pin should be bypassed with a 10 µF tantalum or aluminum electrolytic capacitor and a 0.1 µF ceramic chip capacitor. 1 (22) OE CMOS/TTL compatible digital input that, when low, enables the digital outputs of the ADC08351. When high, the outputs are in a high impedance state. 12 (11) CLK CMOS/TTL compatible digital clock input. VIN is sampled on the falling edge of CLK input. PD CMOS/TTL compatible digital input that, when high, puts the ADC08351 into the power down mode, where it consumes minimal power. When this pin is low, the ADC08351 is in the normal operating mode. 15 (15) www.national.com Equivalent Circuit Description 2 Pin No. Symbol Equivalent Circuit ADC08351 Pin Descriptions and Equivalent Circuits (LLP pins in parentheses) (Continued) Description D0–D7 Conversion data digital output pins. D0 is the LSB, D7 is the MSB. Valid data is output just after the rising edge of the CLK input. These pins are enabled by bringing the OE pin low. 11, 13 (10, 12) VD Positive digital supply pin. Connect to a clean, quiet voltage source of +3V. VA and VD should have a common supply and be separately bypassed with a 10 µF tantalum or aluminum electrolytic capacitor and a 0.1 µF ceramic chip capacitor. See Section 3.0 for more information. 2, 20 (21, 23) DGND 3 thru 10 (1 thru 8) 16 (16) VA 18, 19 (18, 19) AGND The ground return for the digital supply. AGND and DGND should be connected together close to the ADC08351. Positive analog supply pin. Connected to a clean, quiet voltage source of +3V. VA and VD should have a common supply and be separately bypassed with a 10 µF tantalum or aluminum electrolytic capacitor and a 0.1 µF ceramic chip capacitor. See Section 3.0 for more information. The ground return for the analog supply. AGND and DGND should be connected together close to the ADC08351 package. 3 www.national.com ADC08351 Absolute Maximum Ratings Package Dissipation at TA = 25˚C (Notes 1, (Note 4) ESD Susceptibility (Note 5) 2) Human Body Model 4000V If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Soldering Temp., Infrared, 10 sec. (Note 6) Supply Voltage (VA, VD) Storage Temperature Machine Model 4.2V Voltage on Any Input or Output Pin −0.3V to 4.2V Ground Difference (AGND–DGND) Operating Temperature Range VD to DGND Input Current at Any Pin (Note 3) ± 25 mA ± 50 mA Package Input Current (Note 3) −40˚C TA ≤ +85˚C Supply Voltage (VA, VD) −0.5 to (VA + 0.5V) Digital Output Voltage (VOH, VOL) −65˚C to +150˚C Operating Ratings (Notes 1, 2) ± 100 mV CLK, OE Voltage Range 200V 235˚C +2.7V to +3.6V Ground Difference |DGND–AGND| 0V to 100 mV VIN Voltage Range (VP-P) 0.5V to 0.68 VA Converter Electrical Characteristics The following specifications apply for VA = VD = +3.0 VDC, VREF = 2.4V, VIN = 1.63 VP-P, OE = 0V, CL = 20 pF, fCLK = 42 MHz, 50% duty cycle, unless otherwise specified. Boldface limits apply for TA = TMIN to TMAX: all other limits TA = 25˚C (Notes 7, 8) Symbol Parameter Conditions Typical (Note 9) Limits (Note 9) Units (Limits) ± 0.7 ± 1.4 LSB (max) +1.3 LSB (max) −1.0 LSB (min) 0 (max) DC Accuracy INL Integral Non Linearity Error DNL Differential Non Linearity ± 0.6 Missing Codes EZ Zero Scale Offset Error −17 mV EFS Full Scale Offset Error −7 mV Video Accuracy DP Differential Phase Error fCLK = 20 MHz, Video Ramp Input 1.0 Degree DG Differential Gain Error fCLK = 20 MHz, Video Ramp Input 1.5 % 4 pF Analog Input and Reference Characteristics CIN VIN Input Capacitance RIN RIN Input Resistance FPBW Full-Power Bandwidth VREF Reference Input Voltage IREF Reference Input Current VIN = 1.5V + 0.7 Vrms (CLK LOW) (CLK HIGH) At pin 14 11 pF 7.2 kΩ 120 MHz 0.735 V VA V 7.7 mA PD = Low 10.5 mA PD = High 1 mA 2.9 mA Power Supply Characteristics IA ID Analog Supply Current Digital Supply Current PD = Low, No Digital Output Load PD = High 0.5 Total Operating Current Excluding Reference Current, VIN = 0 VDC 13.4 16 mA (max) Power Consumption (active) PD = Low (excluding reference current) 40.2 48 mW (max) Power Consumption (power down) PD = High (excluding reference current) mA