December 2006 Rev 4 1/31 31 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 ¡ Single supply voltage: 2.5 V ¡ Independent supply for CMOS output stage with 2.5 V/3.3 V capability ¡ ENOB=11.2 @ Nyquist ¡ SFDR= -81.5 dBc @ Nyquist ¡ 1GHz analog bandwidth track-and-hold ¡ Common clocking between channels ¡ Dual simultaneous sample and hold inputs ¡ Multiplexed outputs ¡ Built-in reference voltage with external bias capability. Description The TSA1204 is a new generation of high speed, dual-channel analog-to-digital converters implemented in a mainstream 0.25 ìm CMOS technology yielding high performance and very low power consumption. The TSA1204 is specifically designed for applications requiring very low noise floor, high SFDR and good insulation between channels. It is based on a pipeline structure and digital error correction to provide excellent static linearity and over 11.2 effective bits at FS=20 Msps, and Fin=10 MHz. For each channel, an integrated voltage reference simplifies the design and minimizes external components. It is nevertheless possible to use the circuit with external references. The ADC outputs are multiplexed in a common bus with a small number of pins. A tri-state capability is available for the outputs, allowing chip selection. The inputs of the ADC must be differentially driven. The TSA1204 is available in extended (-40° C to +85° C) temperature range, in a small 48-pin TQFP package. Applications ¡ Medical imaging and ultrasound ¡ 3G base station ¡ I/Q signal processing applications ¡ High speed data acquisition system ¡ Portable instrumentation SELECT CLK DGND REFPQ AGND AVCC DGND DVCC DVCC INCMQ REFMQ GNDBI D5 D6 D7 D8 D9 D10 D11(MSB) AVCCB index corner 1 2 3 4 5 6 7 8 9 10 11 32 31 30 29 28 27 26 13 14 15 16 17 18 19 20 21 22 47 25 33 12 23 24 35 34 36 48 46 45 44 43 42 41 40 39 38 37 TSA1204 VCCBE GNDBE AGND INI AGND AGND IPOL AGND AGND INBQ INIB AGND INQ D2 D3 REFMI D0(LSB) OEB AVCC REFPI INCMI AVCC VCCBI GNDBE VCCBI D1 VCCBE D4 7x7mm TQFP48 CLKD www.st.com

Contents TSA1204 2/31 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 . . . . . . . . . . ....

TSA1204 Contents 3/31 10 Definitions of specified parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Static parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Dynamic parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 11 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 12 Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 13 Revision history . . . . . . . . ....

Schematic diagram TSA1204 4/31 1 Schematic diagram Figure 1. TSA1204 block diagram Figure 2. Timing diagram Timing IPOL Buffers +2.5V/3.3V CLK VINI VINBI OEB VINCMI GND VINQ VINBQ VINCMQ AD 12 I channel AD 12 Q channel 12 12 12 12 MUX REF I REF Q SELECT VREFPI VREFPQ Polar. VREFMI VREFMQ common mode common mode D0 TO D11 VCCBE GNDBE N-1 N N+1 N+6 N+2 N+7 N+5 N+3 N+4 N+8 CLK Tpd I + Tod N+9 N+10 N+11 N+12 N+13 DATA OUTPUT sample N+1 I channel sample N Q channel sample N+1 Q channel sample N+2 I channel sample N+2 Q channel sample N+3 I channel OEB Simultaneous sampling on I/Q channels SELECT sample...

TSA1204 Pin descriptions 5/31 2 Pin descriptions Table 1. Pin descriptions (TQFP48 package) Pin Name Description Observation Pin Name Description Observation 1 AGND Analog ground 0 V 25 GNDBE Digital buffer ground 0 V 2 INI I channel analog input 26 VCCBE Digital Buffer power supply 2.5 V/3.3 V 3 AGND Analog ground 0 V 27 D11(MSB) Most Significant Bit output CMOS output (2.5 V/3.3 V) 4 INBI I channel inverted analog input 28 D10 Digital output CMOS output (2.5 V/3.3 V) 5 AGND Analog ground 0 V 29 D9 Digital output CMOS output (2.5 V/3.3 V) 6 IPOL Analog bias current input 30 D8 Digital output...

Dynamic characteristics TSA1204 6/31 3 Dynamic characteristics Dynamic characteristics are measured at AVCC = DVCC = VCCB = 2.5 V, FS= 20 Msps, Fin=10.5 MHz, Vin@ -1 dBFS, VREFP=1.0 V, VREFM=0 V and Tamb = 25° C (unless otherwise specified). 4 Timing characteristics Timing characteristics are measured at AVCC = DVCC = VCCB = 2.5 V, FS= 20 Msps, Fin=10.5 MHz, Vin@ -1 dBFS, VREFP=1.0 V, VREFM=0 V and Tamb = 25° C (unless otherwise specified). Table 2. Dynamic characteristics Symbol Parameter Test conditions Min Typ Max Unit SFDR Spurious free dynamic range -81.5 -71.0 dBc SNR Signal to noise ratio...

TSA1204 Absolute maximum ratings 7/31 5 Absolute maximum ratings 6 Operating conditions Table 4. Absolute maximum ratings Symbol Parameter Values Unit AVCC Analog supply voltage (1) 1. All voltage values, except differential voltage, are with respect to network ground terminal. The magnitude of input and output voltages must not exceed -0.3 V or VCC. 0 to 3.3 V DVCC Digital supply voltage (1) 0 to 3.3 V VCCBE Digital buffer supply voltage (1) 0 to 3.6 V VCCBI Digital buffer supply voltage (1) 0 to 3.3 V IDout Digital output current -100 to 100 mA Tstg Storage temperature +150 °C ESD HBM: human...

Electrical characteristics TSA1204 8/31 7 Electrical characteristics Electrical characteristics are measured at AVCC = DVCC = VCCB = 2.5 V, FS= 20 Msps, Fin=2 MHz, Vin@ -1 dBFS, VREFP=1.0 V, VREFM=0 V, and Tamb = 25° C (unless otherwise specified). Table 6. Analog inputs Symbol Parameter Test conditions Min Typ Max Unit VIN-VINB Full scale reference voltage Differential inputs mandatory 1.1 2.0 2.8 Vpp Cin Input capacitance 7.0 pF Req Equivalent input resistor 3 KÙ BW Analog input bandwidth Vin@full scale, FS=20 Msps 1000 MHz ERB Effective resolution bandwidth 70 MHz Table 7. Digital inputs and...