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參數(shù)資料
| 型號： | RHF1201KSO2 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | ADC |
| 英文描述： | 1-CH 12-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PDSO48 |
| 封裝： | LEAD FREE, HERMETIC SEALED, SOP-48 |
| 文件頁數(shù)： | 6/26頁 |
| 文件大小： | 328K |
| 代理商： | RHF1201KSO2 |
Application information
RHF1201
14/26
Figure 11.
2 Vp-p pure differential
The RHF1201 is designed to obtain optimum performance when driven on differential inputs
with a differential amplitude of 2 V peak-to-peak (2Vp-p). This is the result of 1 Vp-p on the
VIN and VINB inputs in phase opposition.
The RHF1201 is specifically designed to meet sampling requirements for IF, intermediate
frequency input signals. In particular, the track-and-hold in the first stage of the pipeline is
designed to minimize the linearity limitations as the analog frequency increases.This is
achieved by making the input impedance independent from the input frequency.
As a result, the RHF1201 can maintain high performance up to an analog frequency of
150 MHz (see Table 4 on page 8).
Figure 12 on page 15 shows a differential input solution. The input signal is fed to the
primary of the transformer, while the secondary drives both ADC inputs. The transformer
must be 50
Ω matched, and it must be loaded with 50 Ω on both the primary and the
secondary. Tracks between the secondary and VIN and VINB pins must be as short as
possible.
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 0.52 V (see Table 6 on page 9).The INCM is decoupled to maintain a low
noise level on this node. Ceramic technology for decoupling provides good stability of the
capacitor across a wide bandwidth.
VIN
VINB
1V
p-
p
VIN-VINB(2Vp-p)
INCM
(internal)
1V
p-
p
Ground
INCM
VIN
VINB
1V
p-
p
VIN-VINB(2Vp-p)
INCM
(internal)
1V
p-
p
Ground
INCM
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