TSA1204_06 Datasheet, PDF (1/31 Pages) STMicroelectronics – Dual channel 12-bit 20Msps 120mW A/D converter

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 µm 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 F_S=20 Msps, and
F_in=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.
7x7mm TQFP48
index
corner
AGND 1
INI 2
AGND ³
INIB 4
AGND 5
IPOL 6
AVCCB ⁷
AGND 8
INQ 9
AGND 10
INBQ 11
AGND 12
48 47 46 45 44 43 42 41 40 39 38 37
36 ^D2
35 D3
34 ^D4
33 D5
32 D6
TSA1204
31 D7
30 D8
29 D9
28 D10
27 ^D11(MSB)
26 VCCBE
25 GNDBE
13 14 15 16 17 18 19 20 21 22 23 24
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
December 2006
Rev 4
1/31
www.st.com
31