TSA1204IFT

D1 GNDBI D0(LSB) DVCC VCCBE DGND GNDBE SELECT VCCBI CLK CLKD DGND VCCBI OEB DVCC AVCC AVCC AVCC AGND INCMI INCMQ REFMI REFMQ REFPI REFPQ TSA1204 Dual channel 12-bit 20Msps 120mW A/D converter Features 0.5 Msps to 20 Msps sampling frequency Adaptive power consumption: 120 mW 20 Msps, 95 mW 10 Msps 7x7mm TQFP48 Single supply voltage: 2.5 V Independent supply for CMOS output stage with 2.5 V/3.3 V capability index corner 37 48 47 46 45 44 43 42 41 40 39 38 ENOB=11.2 Nyquist D2 1 36 AGND SFDR= -81.5 dBc Nyquist D3 35 INI 2 D4 3 34 AGND 1GHz analog bandwidth track-and-hold 4 INIB 33 D5 AGND 5 Common clocking between channels 32 D6 31 IPOL 6 D7 Dual simultaneous sample and hold inputs 7 30 D8 AVCCB TSA1204 AGND 8 29 D9 Multiplexed outputs INQ 9 28 D10 Built-in reference voltage with external bias D11(MSB) 10 27 AGND capability. 26 INBQ 11 VCCBE AGND 25 GNDBE 12 13 14 15 16 17 18 19 20 21 22 23 24 Description The TSA1204 is a new generation of high speed, dual-channel analog-to-digital converters implemented in a mainstream 0.25 m CMOS technology yielding high performance and very The inputs of the ADC must be differentially low power consumption. driven. The TSA1204 is specifically designed for The TSA1204 is available in extended (-40 C to applications requiring very low noise floor, high +85 C) temperature range, in a small 48-pin SFDR and good insulation between channels. It is TQFP package. based on a pipeline structure and digital error correction to provide excellent static linearity and over 11.2 effective bits at F =20 Msps, and S Applications F =10 MHz. in Medical imaging and ultrasound For each channel, an integrated voltage reference 3G base station simplifies the design and minimizes external components. It is nevertheless possible to use the I/Q signal processing applications circuit with external references. High speed data acquisition system The ADC outputs are multiplexed in a common Portable instrumentation bus with a small number of pins. A tri-state capability is available for the outputs, allowing chip selection. December 2006 Rev 4 1/31 www.st.com 31Contents TSA1204 Contents 1 Schematic diagram 4 2 Pin descriptions 5 3 Dynamic characteristics 6 4 Timing characteristics . 6 5 Absolute maximum ratings . 7 6 Operating conditions 7 7 Electrical characteristics . 8 8 Application information . 15 8.1 Additional functions . 15 8.1.1 Output enable mode (OEB) 15 8.1.2 Select mode (SELECT) . 15 8.2 References and common mode connection . 16 8.2.1 Internal reference and common mode 16 8.2.2 External reference and common mode . 16 8.3 Driving the differential analog inputs 17 8.4 Clock input 18 8.5 Power consumption . 18 8.6 Layout precautions 19 8.7 EVAL1204/BA evaluation board 19 8.7.1 Evaluation board operating conditions 22 8.7.2 Consumption adjustment 22 8.7.3 Single and differential inputs . 22 8.7.4 Mode select 23 9 Practical application examples . 24 9.1 Digital interface applications . 24 9.2 Medical imaging application . 24 2/31