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參數(shù)資料
| 型號： | TSA1201IF |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | ADC |
| 英文描述： | 1-CH 12-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQFP48 |
| 封裝： | 7 X 7 MM, PLASTIC, TQFP-48 |
| 文件頁數(shù)： | 6/20頁 |
| 文件大小： | 349K |
| 代理商： | TSA1201IF |
TSA1201
14/20
DRIVING THE ANALOG INPUT
Differential inputs
The TSA1201 has been designed to obtain
optimum performances when being differentially
driven. An RF transformer is a good way to
achieve such performances.
Figure 3 describes the schematics. The input
signal is fed to the primary of the transformer,
while the secondary drives both ADC inputs.
Figure 3 : Differential input configuration with
transformer
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
0.57V. 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
Minicircuits.
You
might
also
use
a
higher
impedance ratio (1:2 or 1:4) to reduce the driving
requirement on the analog signal source. For
example, with internal references, each analog
input can drive a 1Vpp amplitude input signal, so
the resultant differential amplitude is 2Vpp.
Figure 4 : AC-coupled differential input
Figure 4 represents the biasing of a differential
input signal in AC-coupled differential input
configuration. Both inputs VIN and VINB are
centered around the common mode voltage, that
can be let internal or fixed externally.
Figure 5 shows a DC-coupled configuration with
forced INCM to the DC analog input (mid-voltage)
while VREFM is connected to ground and VREFP
is let internal (1V); we achieve a 2Vpp differential
amplitude.
Figure 5 : DC-coupled 2Vpp differential analog
input
Single-ended input configuration
The single-ended input configuration of the
TSA1201 requires particular biasing and driving.
The structure being fully differential, care has to
be taken in order to properly bias the inputs in sin-
gle-ended mode. Figure 6 summarizes the link
from the differential configuration to the sin-
gle-ended one; a wrong configuration is also pre-
sented.
- With differential driving, both inputs are centered
around the INCM voltage.
- The transition to single-ended configuration
implies to connect the unused input (VINB for
instance) to the DC component of the single input
(VIN) and also to the input common mode in order
to be well balanced. The mid-code is achieved at
the crossing between VIN and VINB, therefore
inputs are conveniently biased.
- Unlikely other structures of converters in which
the unused channel can be grounded; in our case
it will end with unbalanced inputs and saturation of
the internal amplifiers leading to a non respect of
the output codes.
TSA1201
VIN
VINB
INCM
50
100pF
330pF
4.7uF
10nF
Analog source
1:1
ADT1-1
50
10nF
TSA1201
VIN
VINB
INCM
33pF
100k
100k
50
10nF
common
mode
TSA1201
VIN
VINB
INCM
330pF
4.7uF
10nF
analog
DC
AC+DC
VREFP
VREFM
VREFP-VREFM = 1 V
DC
analog
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PDF描述 |
|---|---|
| TSA1201IFT | 1-CH 12-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQFP48 |
| TSA1203IFT | 2-CH 12-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, QFP48 |
| TSA1203IF | 2-CH 12-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, QFP48 |
| TSA1203IFT-E | 2-CH 12-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, QFP48 |
| TSA1204IFT-E | 2-CH 12-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQFP48 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TSA1201IFT | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:12-BIT, 50MSPS, 150mW A/D CONVERTER |
| TSA1203 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:DUAL-CHANNEL, 12-BIT, 40MSPS, 230mW A/D CONVERTER |
| TSA1203_06 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Dual-channel 12-bit 40Msps 215mW A/D converter |
| TSA1203IF | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Dual Channel 12-Bit RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| TSA1203IFT | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Dual Channel 12-Bit RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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