CDK3400

Data Sheet A m p l i fy t h e H u m a n E x p e r i e n c e CDK3400/CDK3401 10-bit, 100/150MSPS, Triple Video DACs CDK3400/CDK3401 10-bit, 100/150MSPS, Triple Video DACs features n n n n n n n n n n General Description CDK3400/3401 products are low-cost triple D/A converters that are tailored to fit graphics and video applications where speed is critical. Two speed grades are available: CDK3400 at 100MSPS and CDK3401 at 150MSPS. TTL-level inputs are converted to analog current outputs that can drive 25-37.5Ω loads corresponding to doubly-terminated 50-75Ω loads. A sync current following SYNC input timing is added to the IOG output. BLANK will override RGB inputs, setting IOG, IOB and IOR currents to zero when BLANK = L. Although appropriate for many applications, the internal 1.235V reference voltage can be overridden by the VREF input. Few external components are required, just the current reference resistor, current output load resistors, and decoupling capacitors. Package is a 48-lead TQFP. Fabrication technology is CMOS. Performance is guaranteed from 0 to 70°C. 10-bit resolution 150 megapixels per second ±0.1% linearity error Sync and blank controls 1.0Vpp video into 37.5Ω or 75Ω load Internal bandgap voltage reference Double-buffered data for low distortion TTL-compatible inputs Low glitch energy Single +5V power supply applications n Video signal conversion – RGB – YCBCR – Composite, Y, C Multimedia systems Image processing True-color graphics systems (1 billion colors) Broadcast television equipment High-Definition Television (HDTV) equipment Direct digital synthesis Block Diagram SYNC BLANK SYNC n n n n n G9-0 10 10-bit D/A Converter IO G n B9-0 10 10-bit D/A Converter IO B Rev 1B R9-0 CLOCK 10 10-bit D/A Converter IO R COMP R REF V REF +1.235V Ref Ordering Information Part Number CDK3400CTQ48 CDK3400CTQ48Y CDK3401CTQ48 CDK3401CTQ48Y Package TQFP-48 TQFP-48 TQFP-48 TQFP-48 Pb-Free Yes Yes Yes Yes RoHS Compliant Yes Yes Yes Yes Operating Temp Range 0°C to +70°C 0°C to +70°C 0°C to +70°C 0°C to +70°C Packaging Method Package Quantity Tray Tray Tray Tray 250 1,250 250 1,250 Moisture sensitivity level for all parts is MSL-3. ©2008 CADEKA Microcircuits LLC www.cadeka.com Data Sheet Pin Configuration TQFP-48 G0 R9 R8 R7 R6 R5 R4 R3 R2 R1 R0 NC 48 47 46 45 44 43 42 41 40 39 38 37 CDK3400/CDK3401 10-bit, 100/150MSPS, Triple Video DACs G1 G2 G3 G4 G5 G6 G7 G8 G9 BLANK SYNC VDD 1 2 3 4 5 6 7 8 9 10 11 12 TQFP CDK3400/3401 36 35 34 33 32 31 30 29 28 27 26 25 RREF VREF COMP IOR IOG VDD VDD IOB GND GND CLOCK NC Pin Assignments Pin No. 26 47-37 48, 9–1 23–14 controls 11 10 Video outputs 33 32 29 35 36 34 12, 30, 31 27, 28 IOR IOG IOB VREF RREF COMP VDD GND Red Current Output Green Current Output Blue Current Output Voltage Reference Output/Input Current-Setting Resistor Compensation Capacitor Power Supply Ground SYNC BLANK Sync Pulse Input Blanking Input Pin Name CLK R9-0 G9-0 B9-0 Description Clock Input Red Pixel Data Inputs Green Pixel Data Inputs Blue Pixel Data Inputs clock and pixel i/o NC B0 B1 B2 B3 B4 B5 B6 B7 B8 B9 NC 13 14 15 16 17 18 19 20 21 22 23 24 Rev 1B Voltage reference power and Ground ©2008 CADEKA Microcircuits LLC www.cadeka.com 2 Data Sheet Absolute Maximum Ratings The safety of the device is not guaranteed when it is operated above the “Absolute Maximum Ratings”. The device should not be operated at these “absolute” limits. Adhere to the “Recommended Operating Conditions” for proper device function. The information contained in the Electrical Characteristics tables and Typical Performance plots reflect the operating conditions noted on the tables and plots. CDK3400/CDK3401 10-bit, 100/150MSPS, Triple Video DACs Parameter Power Supply Voltage VDD (Measured to GND) Inputs Applied Voltage (measured to GND)(2) Forced Current(3,4) Outputs Applied Voltage (measured to GND)(2) Forced Current(3,4) Short Circuit Duration (single output in HIGH state to GND) Temperature Operating, Ambient Junction Lead Soldering (10 seconds) Vapor Phase Soldering (1 minute) Storage Min -0.5 -0.5 -10.0 -0.5 -60.0 Max 7.0 VDD + 0.5 10.0 VDD + 0.5 60.0 Infinite 110 150 300 220 150 Unit V V mA V mA sec °C °C °C °C °C -20 -65 notes: 1. Functional operation under any of these conditions is NOT implied. Performance and reliability are guaranteed only if Operating Conditions are not exceeded. 2. Applied voltage must be current limited to specified range. 3. Forcing voltage must be limited to specified range. 4. Current is specified as conventional current flowing into the device. Recommended Operating Conditions Symbol VDD fS tPWH tPWL tW tS th VREF CC RL VIH VIL TA Parameter Power Supply Voltage Conversion Rate CLK Pulsewidth, HIGH CLK Pulsewidth, LOW CLK Pulsewidth Input Data Setup Time Input Date Hold Time Reference Voltage, External Compensation Capacitor Output Load Input Voltage, Logic HIGH Input Voltage, Logic LOW Ambient Temperature, Still Air CDK3400 CDK3401 CDK3400 CDK3401 CDK3400 CDK3401 CDK3400 CDK3401 Min 4.75 Typ 5.0 Max 5.25 100 150 Unit V MSPS MSPS ns ns ns ns ns ns ns ns V µF Ω V V °C 3.1 2.5 3.1 2.5 10 6.6 1.7 0 1.0 Rev 1B 1.235 0.1 37.5 1.5 2.0 GND 0 VDD 0.8 70 ©2008 CADEKA Microcircuits LLC www.cadeka.com 3 Data Sheet Electrical Characteristics (TA = 25°C, VDD = +5V, VREF = 1.235V, RL = 37.5Ω, RREF = 540Ω; unless otherwise noted) symbol IDD PD RO CO IIH IIL IREF VREF VOC CDI parameter Power Supply Current Output Resistance Output Capacitance Input Current, HIGH Input Current, LOW VREF Input Bias Current Reference Voltage Output Output Compliance Digital Input Capacitance (1) conditions VDD = 5.25V, TA = 0°C VDD = 5.25V, TA = 0°C Min typ Max 125 655 units mA mW Total Power Dissipation(1) CDK3400/CDK3401 10-bit, 100/150MSPS, Triple Video DACs 100 IOUT = 0mA VDD = 5.25V, VIN = 2.4V VDD = 5.25V, VIN = 0.4V 0 1.235 Referred to VDD -0.4 0 4 +1.5 10 30 -5 5 ±100 kΩ pF µA µA µA V V pF notes: 1. 100% tested at 25°C. 2. Parameter is guaranteed (but not tested) by design and characterization data. Switching Characteristics (TA = 25°C, VDD = +5V, VREF = 1.235V, RL = 37.5Ω, RREF = 590Ω; unless otherwise noted) symbol tD tSKEW tR tF notes: 1. 100% production tested at +25°C. 2. Parameter is guaranteed (but not tested) by design and characterization data. parameter Clock to Output Delay Output Skew Output Risetime Output Falltime conditions VDD = 4.75V, TA = 0°C 10% to 90% of Full Scale 90% to 10% of Full Scale Min typ 10 1 Max 15 2 3 3 units ns ns ns ns System Performance Characteristics (TA = 25°C, VDD = +5V, VREF = 1.235V, RL = 37.5Ω, RREF = 590Ω; unless otherwise noted) symbol INL DNL EDM PSRR notes: 1. 100% production tested at +25°C. 2. Parameter is guaranteed (but not tested) by design and characterization data. parameter Integral Linearity Error Differential Linearity Error DAC to DAC Matching Power Supply Rejection Ratio conditions Min typ ±0.1 ±0.1 3 Max ±0.25 ±0.25 10 0.05 units %/FS %/FS % %/% Rev 1B ©2008 CADEKA Microcircuits LLC www.cadeka.com 4 Data Sheet Table 1. Output Voltage vs. Input Code, SYNC and BLANK, VREF = 1.235V, RREF = 590Ω, RL = 37.5Ω rGB9-0 (MsB…lsB) Blue anD reD D/as sYnc BlanK Vout sYnc Green D/a BlanK Vout 11 1111 1111 11 1111 1111 11 1111 1110 11 1111 1101 • • 10 0000 0000 01 1111 1111 • • 00 0000 0010 00 0000 0001 00 0000 0000 XX XXXX XXXX XX XXXX XXXX X X X X • • X X • • X X X X X 1 1 1 1 • • 1 1 • • 1 1 1 0 0 0.7140 0.7140 0.7134 0.7127 • • 0.3843 0.3837 • • 0.0553 0.0546 0.0540 0.0000 0.0000 1 0 1 1 • • 1 1 • • 1 1 1 1 0 1 1 1 1 • • 1 1 • • 1 1 1 0 0 1.0000 0.7140 0.9994 0.9987 • • 0.6703 0.6697 • • 0.3413 0.3406 0.3400 0.2860 0.0000 CDK3400/CDK3401 10-bit, 100/150MSPS, Triple Video DACs tPWL CLK tPWH 1/fs ts Pixel Data and Controls Data N tH Data N+1 Data N+2 Rev 1B 3%/FS 90% tSET tF 10% tR tD OUTPUT 50% Figure 1. CDK3400/3401 Timing Diagram ©2008 CADEKA Microcircuits LLC www.cadeka.com 5 Data Sheet Functional Description Within the CDK3400/3401 are three identical 10-bit D/A converters, each with a current source output. External loads are required to convert the current to voltage outputs. Data inputs RGB7-0 are overridden by the BLANK input. SYNC = H activates, sync current from IOS for syncon-green video signals. which offsets the current output. If BLANK = Low, data inputs and the pedestal are disabled. Sync Pulse Input - SYNC Bringing SYNC LOW, turns off a 40 IRE (7.62mA) current source which forms a sync pulse on the Green D/A converter output. SYNC is registered on the rising edge of CLK with the same pipeline latency as BLANK and pixel data. SYNC does not override any other data and should be used only during the blanking interval. Since this is a single-supply D/A and all signals are positive-going, sync is added to the bottom of the Green D/A range. So turning SYNC OFF means turning the current source ON. When a sync pulse is desired, the current source is turned OFF. If the system does not require sync pulses from the Green D/A converter, SYNC should connected to GND. Blanking Input - BLANK When BLANK is LOW, pixel inputs are ignored and the D/A converter outputs fall to the blanking level. BLANK is registered on the rising edge of CLK and has the same pipeline latency as SYNC. CDK3400/CDK3401 10-bit, 100/150MSPS, Triple Video DACs Digital Inputs All digital inputs are TTL-compatible. Data is registered on the rising edge of the CLK signal. Following one stage of pipeline delay, the analog output changes tDO after the rising edge of CLK. Clock Input - CLK The clock input is TTL-compatible and all pixel data is registered on the rising edge of CLK. It is recommended that CLK be driven by a dedicated TTL buffer to avoid reflection induced jitter, overshoot, and undershoot. Pixel Data Inputs - R9-0, B9-0, G9-0 TTL-compatible Red, Green and Blue Data Inputs are registered on the rising edge of CLK. D/A Outputs Each D/A output is a current source. To obtain a voltage output, a resistor must be connected to ground. Output voltage depends upon this external resistor, the reference voltage, and the value of the gain-setting resistor connected between RREF and GND. Normally, a source termination resistor of 75Ω is connected between the D/A current output pin and GND near the D/A converter. A 75Ω line may then be connected with another 75Ω termination resistor at the far end of the cable. This “double termination” presents the D/A converter with a net resistive load of 37.5Ω. The CDK3400/3401 may also be operated with a single 75Ω terminating resistor. To lower the output voltage swing to the desired range, the nominal value of the resistor on RREF should be doubled. R, G, and B Current Outputs - IOR, IOG, IOB The R, G, and B current source outputs of the D/A converters are capable of driving RS-343A/SMPTE-170M compatible levels into doubly-terminated 75Ω lines. Sync pulses may be added to the Green D/A output. SYNC and BLANK SYNC and BLANK inputs control the output level (Figure 2 and Table 1, on the previous page) of the D/A converters during CRT retrace intervals. BLANK forces the D/A outputs to the blanking level while SYNC = L turns off a current source that is connected to the green D/A converter. SYNC = H adds a 40 IRE sync pulse to the green output, SYNC = L sets the green output to 0.0V during the sync tip. SYNC and BLANK are registered on the rising edge of CLK. Rev 1B Data: 660mV max. Pedestal: 54mV Sync: 286mV Figure 2. Normal Output Levels BLANK gates the D/A inputs and sets the pedestal voltage. If BLANK = HIGH, the D/A inputs are added to a pedestal ©2008 CADEKA Microcircuits LLC www.cadeka.com 6 Data Sheet Current-Setting Resistor - RREF Full-scale output current of each D/A converter is determined by the value of the resistor connected between RREF and GND. Nominal value of RREF is found from: RREF = 9.1 (VREF/IFS) where IFS is the full-scale (white) output current (in amps) from the D/A converter (without sync). Sync is 0.4 * IFS. D/A full-scale (white) current may also be calculated from: IFS = VFS/RL Where VFS is the white voltage level and RL is the total resistive load (Ω) on each D/A converter. VFS is the blank to full-scale voltage. A 0.1µF capacitor must be connected between the COMP pin and VDD to stabilize internal bias circuitry and ensure low-noise operation. Voltage Reference Output/Input - VREF An internal voltage source of +1.235V is output on the VREF pin. An external +1.235V reference may be applied here which overrides the internal reference. Decoupling VREF to GND with a 0.1µF ceramic capacitor is required. CDK3400/CDK3401 10-bit, 100/150MSPS, Triple Video DACs Power and Ground Required power is a single +5.0V supply. To minimize power supply induced noise, analog +5V should be connected to VDD pins with 0.1µF and 0.01µF decoupling capacitors placed adjacent to each VDD pin or pin pair. The high slew-rate of digital data makes capacitive coupling to the outputs of any D/A converter a potential problem. Since the digital signals contain high-frequency components of the CLK signal, as well as the video output signal, the resulting data feedthrough often looks like harmonic distortion or reduced signal-to-noise performance. All ground pins should be connected to a common solid ground plane for best performance. Voltage Reference All three D/A converters are supplied with a common voltage reference. Internal bandgap voltage reference voltage is +1.235V with a 3kΩ source resistance. An external voltage reference may be connected to the VREF pin, overriding the internal voltage reference. Rev 1B ©2008 CADEKA Microcircuits LLC www.cadeka.com 7 Data Sheet Equivalent Circuits V DD V DD CDK3400/CDK3401 10-bit, 100/150MSPS, Triple Video DACs p n Digital Input n OUT GND GND V DD p Figure 3. Equivalent Digital Input Circuit Figure 4. Equivalent Analog Output Circuit V DD p R REF V REF p GND Rev 1B Figure 5. Equivalent Analog Input Circuit ©2008 CADEKA Microcircuits LLC www.cadeka.com 8 Data Sheet Typical Application Diagrams 75Ω Video Cables 75Ω 2 IN2 OUT2 7 IOR 1 IN1 OUT1 8 75Ω 220µF R CDK3400/ CDK3401 IOG 75Ω 75Ω 220µF CDK3400/CDK3401 10-bit, 100/150MSPS, Triple Video DACs G 75Ω 75Ω IOB 3 IN3 CLC3800 OUT3 6 75Ω 220µF 75Ω B 75Ω +3V or +5V 4 +Vs GND 5 1.0µF 0.1µF DVD Player or STB AC-Coupling Caps are Optional Figure 6. Standard Definition Video Output Circuit Diagram +Vs IOR + 75Ω CDK3400/ CDK3401 IOG - 1/3 CLC3605 75Ω 330Ω 75Ω Video Cables 75Ω 330Ω IOB -Vs Figure 7. Graphics Output Driver Circuit Diagram Rev 1B +Vs IOR + 75Ω CDK3400/ CDK3401 IOG - 1/3 CLC3605 75Ω 330Ω 75Ω 75Ω Video Cables 75Ω Video Cables 75Ω 330Ω IOB -Vs 75Ω 75Ω Video Cables 75Ω 75Ω Figure 8. Standard Definition Video Distribution Circuit Diagram ©2008 CADEKA Microcircuits LLC www.cadeka.com 9 Data Sheet Applications Dicussion Figure 9 below illustrates a typical CDK3400/3401 interface circuit. In this example, an optional 1.2V bandgap reference is connected to the VREF output, overriding the internal voltage reference source. Grounding It is important that the CDK3400/3401 power supply is well+5V 10µF 0.1µF VDD RED PIXEL INPUT GREEN PIXEL INPUT BLUE PIXEL INPUT CLOCK SYNC BLANK R9-0 GND regulated and free of high-frequency noise. Careful power supply decoupling will ensure the highest quality video signals at the output of the circuit. The CDK3400/3401 has separate analog and digital circuits. To keep digital system noise from the D/A converter, it is recommended that power supply voltages (VDD) come from the system analog power source and all ground connections (GND) be made to the analog ground plane. Power supply pins should be individually decoupled at the pin. CDK3400/CDK3401 10-bit, 100/150MSPS, Triple Video DACs IOR IOG 75Ω 75Ω 75Ω COMP 0.1µF V REF R REF +5V Red Zo = 75Ω 75Ω 75Ω 75Ω Green w/Sync Zo = 75Ω G9-0 B9-0 CLK SYNC BLANK Blue Zo = 75Ω CDK3400/3401 Triple 10-bit D/A Converter IOB (not required without external reference) 3.3kΩ LM185-1.2 560Ω (Optional) 0.1µF Figure 9. Typical Interface Circuit Diagram Printed Circuit Board Layout Designing with high-performance mixed-signal circuits demands printed circuits with ground planes. Overall system performance is strongly influenced by the board layout. Capacitive coupling from digital to analog circuits may result in poor D/A conversion. Consider the following suggestions when doing the layout: 1. Keep the critical analog traces (VREF, IREF, COMP, IOS, IOR, IOG) as short as possible and as far as possible from all digital signals. The CDK3400/3401 should be located near the board edge, close to the analog out-put connectors. 2. Power plane for the CDK3400/3401 should be separate from that which supplies the digital circuitry. A single power plane should be used for all of the VDD pins. If the power supply for the CDK3400/3401 is the same as that of the system’s digital circuitry, power to the CDK3400/3401 should be decoupled with 0.1µF and 0.01µF capacitors and iso-lated with a ferrite bead. 3. The ground plane should be solid, not cross-hatched. Connections to the ground plane should have very short leads. 4. If the digital power supply has a dedicated power plane layer, it should not be placed under the CDK3400/3401, the voltage reference, or the analog outputs. Capacitive coupling of digital power supply noise from this layer to the CDK3400/3401 and its related analog circuitry can have an adverse effect on performance. 5. CLK should be handled carefully. Jitter and noise on this clock will degrade performance. Terminate the clock line carefully to eliminate overshoot and ringing. Evaluation boards are available (CEB3400 and CEB3401), contact CADEKA for more information. Rev 1B Related Products n n CDK3402/3403 Triple 8-bit 100/150MSPS DACs CDK3404 Triple 8-bit 180MSPS DAC ©2008 CADEKA Microcircuits LLC www.cadeka.com 10 Data Sheet Mechanical Dimensions TQFP-48 Package CDK3400/CDK3401 10-bit, 100/150MSPS, Triple Video DACs Rev 1B For additional information regarding our products, please visit CADEKA at: cadeka.com caDeKa Headquarters Loveland, Colorado T: 970.663.5452 T: 877.663.5452 (toll free) CADEKA, the CADEKA logo design, COMLINEAR and the COMLINEAR logo design are trademarks or registered trademarks of CADEKA Microcircuits LLC. All other brand and product names may be trademarks of their respective companies. CADEKA reserves the right to make changes to any products and services herein at any time without notice. CADEKA does not assume any responsibility or liability arising out of the application or use of any product or service described herein, except as expressly agreed to in writing by CADEKA; nor does the purchase, lease, or use of a product or service from CADEKA convey a license under any patent rights, copyrights, trademark rights, or any other of the intellectual property rights of CADEKA or of third parties. Copyright ©2008 by CADEKA Microcircuits LLC. All rights reserved. A m p l i fy t h e H u m a n E x p e r i e n c e