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零件编号 | TSA1203 | ||
描述 | Dual-channel 12-bit 40Msps 215mW A/D converter | ||
制造商 | ST Microelectronics | ||
LOGO | |||
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TSA1203
Dual-channel 12-bit 40Msps 215mW A/D converter
Features
■ Low power consumption: 215 mW@40 Msps
■ Single supply voltage: 2.5 V
■ Independent supply for CMOS output stage
with 2.5 V/3.3 V capability
■ SFDR = -75 dBc @ Fin = 10 MHz
■ 1GHz analog bandwidth track-and-hold
■ Common clocking between channels
■ Dual simultaneous sample and hold inputs
■ Multiplexed binary word outputs
■ Built-in reference voltage with external bias
capability
Description
The TSA1203 is a new generation high-speed,
dual-channel analog-to-digital converter
implemented in a mainstream 0.25 µm CMOS
technology that offers high performance and very
low power consumption.
The TSA1203 is specifically designed for
applications requiring a very low noise floor, high
SFDR and good insulation between channels. It is
based on a pipeline structure and digital error
correction to provide high static linearity at
FS = 40 Msps, and Fin = 10 MHz.
Each channel has an integrated voltage reference
to simplify the design and minimize external
components. It is nevertheless possible to use the
circuit with external references.
The ADC binary word 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 TSA1203 is available in extended
temperature range (-40° C to +85° C), in a small
48-pin TQFP package.
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
TSA1203
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
Applications
■ Medical imaging and ultrasound
■ 3G base station
■ I/Q signal processing applications
■ High-speed data acquisition systems
■ Portable instrumentation
December 2006
Rev 4
1/30
www.st.com
30
Electrical characteristics
7 Electrical characteristics
TSA1203
Electrical characteristics, unless otherwise specified, are measured at
AVCC = DVCC = VCCB = 2.5 V, FS = 40 Msps, Rpol = 18 kΩ, Fin = 2 MHz, Vin@ -1 dBFS,
VREFP=0.8 V, VREFM=0 V, and Tamb = 25° C.
Table 6. Analog inputs
Symbol
Parameter
VIN-VINB Full scale reference voltage
Cin Input capacitance
Req Equivalent input resistor
BW Analog input bandwidth
ERB Effective resolution bandwidth
Test
conditions
Min
Typ Max Unit
Differential
inputs
mandatory
1.1 2.0 2.8 Vpp
7.0 pF
10 kΩ
Vin@full scale,
Fs=40 Msps
1000
70
MHz
MHz
Table 7. Digital inputs and outputs
Symbol
Parameter
Test
conditions
Min
Typ
Max Unit
Clock and Select inputs
VIL Logic "0" voltage
VIH Logic "1" voltage
OEB input
VIL Logic "0" voltage
VIH Logic "1" voltage
Digital outputs
VOL Logic "0" voltage
VOH Logic "1" voltage
IOZ
High impedance
leakage current
CL
Output load
capacitance
2.0
0.75 x VCCBE
IOL=10 µA
IOH=10 µA
OEB set to
VIH
0.9 x VCCBE
-1.67
0
2.5
0
VCCBE
0
VCCBE
0
0.8 V
V
0.25 x VCCBE
V
V
0.1 x VCCBE
1.67
V
V
µA
15 pF
Table 8. Reference voltage
Symbol
Parameter
VREFP I
VREFP Q
VINCM I
VINCM Q
Top internal reference voltage
Input common mode voltage
Min Typ Max Unit
0.81 0.88 0.94
V
0.41 0.46 0.50
V
8/30
Application information
TSA1203
8.2
8.2.1
References and common mode connection
VREFM must always be connected directly to ground externally for most applications.
Internal reference and common mode
In the default configuration, the ADC operates with its own reference and common mode
voltages generated by its internal bandgap. It is recommended to decouple the VREFP and
INCM pins in order to minimize low and high frequency noise (see Figure 23).
Figure 23. Internal reference and common mode setting
0.89V
330pF 10nF 4.7μF
VIN VREFP
TSA1203
INCM 0.46V
VINB
330pF 10nF 4.7μF
VREFM
8.2.2
External reference and common mode
Each of the voltages VREFP, VREFM and INCM can be fixed externally to better fit the
application needs (refer to Table 5: Operating conditions on page 7 for min/max values). It is
possible to use an external reference voltage device for specific applications requiring even
better linearity, accuracy or enhanced temperature behavior.
The VREFP and VREFM voltages set the analog dynamic range at the input of the converter
that has a full scale amplitude of 2*(VREFP-VREFM).
The INCM voltage is half the value of VREFP-VREFM.
The best signal-to-noise performance is achieved with a dynamic range at its maximum
value. To obtain this, VREFM can be connected to GND, and VREFP can be set up to 1.5 V
maximum. However, signal to noise performance is a trade-off with the THD, with a
possibility of degraded THD under these conditions.
To obtain the highest performance from the TSA1203 device, we recommend implementing
the configuration shown in Figure 24 with the STMicroelectronics TS821 or TS4041-1.2
Vref.
16/30
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页数 | 30 页 | ||
下载 | [ TSA1203.PDF 数据手册 ] |
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