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參數(shù)資料
| 型號： | TSA1204IFT-E |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | ADC |
| 英文描述： | 2-CH 12-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQFP48 |
| 封裝： | 7 X 7 MM, PLASTIC, TQFP-48 |
| 文件頁數(shù)： | 9/31頁 |
| 文件大?。?/td> | 435K |
| 代理商： | TSA1204IFT-E |
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TSA1204
Application information
17/31
8.3
Driving the differential analog inputs
The TSA1204 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 0.46 V. 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
Minicircuits. You might also use a higher impedance ratio (1:2 or 1:4) to reduce the driving
requirement on the analog signal 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
Figure 26.
AC-coupled differential input
Figure 26 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.
TSA1204
VIN
VINB
INCM
50
Ω
33pF
330pF
470nF
10nF
Analog source
1:1
ADT1-1
channels
I or Q
50
Ω
10nF
TSA1204
VIN
VINB
INCM
33pF
100k
Ω
100k
Ω
50
Ω
10nF
common
mode
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