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參數資料
| 型號： | TSA1203IF |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | ADC |
| 英文描述： | 2-CH 12-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, QFP48 |
| 封裝： | 7 X 7 MM, TQFP-48 |
| 文件頁數： | 9/30頁 |
| 文件大小： | 440K |
| 代理商： | TSA1203IF |
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TSA1203
Application information
17/30
Figure 24. External reference setting
8.3
Driving the differential analog inputs
The TSA1203 is designed to deliver optimum performance when driven on differential
inputs. An RF transformer is an efficient way of achieving this high performance.
Figure 25 describes the schematics. The input signal is fed to the primary of the transformer,
while the secondary drives both ADC inputs. The common mode voltage of the ADC (INCM)
is connected to the center-tap of the secondary of the transformer in order to bias the input
signal around this common voltage, internally set to 0.46V. It determines the DC component
of the analog signal. Being a high-impedance input, it acts as an I/O and can be externally
driven to adjust this DC component. The INCM is decoupled to maintain a low noise level on
this node. Our evaluation board is mounted with a 1:1 ADT1-1WT transformer from Mini
circuits. You might also use a higher impedance ratio (1:2 or 1:4) to reduce the driving
requirement on the analog source.
Each analog input can drive a 1.4 Vpp amplitude input signal, so the resulting differential
amplitude is 2.8 Vpp.
Figure 25. Differential input configuration with transformer
1k
Ω
TSA1203
VIN
VINB
VREFM
VREFP
external
reference
VCCA
330pF
4.7
μF
10nF
TS821
TS4041
1.2V
TSA1203
VIN
VINB
INCM
50
Ω
33pF
330pF
470nF
10nF
Analog source
1:1
ADT1-1
channels
I or Q
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| TSA1204IFT | 2-CH 12-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQFP48 |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TSA1203IFT | 功能描述:模數轉換器 - ADC Dual Channel 12-Bit RoHS:否 制造商:Texas Instruments 通道數量:2 結構:Sigma-Delta 轉換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| TSA1203IFT-E | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Dual-channel 12-bit 40Msps 215mW A/D converter |
| TSA1204 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:DUAL-CHANNEL, 12-BIT, 20MSPS, 120mW A/D CONVERTER |
| TSA1204_06 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Dual channel 12-bit 20Msps 120mW A/D converter |
| TSA1204IF | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:DUAL-CHANNEL, 12-BIT, 20MSPS, 120mW A/D CONVERTER |
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