參數(shù)資料
型號(hào)： AD7400YRWZ
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 6/20頁(yè)
文件大小： 0K
描述： IC MODULATOR SIGMA-DELTA 16-SOIC
標(biāo)準(zhǔn)包裝： 47
類型： 調(diào)制器
分辨率（位）： 16 b
采樣率（每秒）： 10M
數(shù)據(jù)接口： 串行
電壓電源： 單電源
電源電壓： 4.5 V ~ 5.25 V
工作溫度： -40°C ~ 105°C
安裝類型： 表面貼裝
封裝/外殼： 16-SOIC（0.295"，7.50mm 寬）
供應(yīng)商設(shè)備封裝： 16-SOIC W
包裝： 管件
AD7400
Data Sheet
Rev. G | Page 14 of 20
DIFFERENTIAL INPUTS
The analog input to the modulator is a switched capacitor
design. The analog signal is converted into charge by highly
linear sampling capacitors. A simplified equivalent circuit
diagram of the analog input is shown in Figure 23. A signal
source driving the analog input must be able to provide the
charge onto the sampling capacitors every half MCLKOUT cycle
and settle to the required accuracy within the next half cycle.
φA
φB
1k
VIN–
φA
φB
1k
VIN+
2pF
φA
MCLKOUT
04718-
027
Figure 23. Analog Input Equivalent Circuit
Because the AD7400 samples the differential voltage across its
analog inputs, low noise performance is attained with an input
circuit that provides low common-mode noise at each input.
The amplifiers used to drive the analog inputs play a critical role in
attaining the high performance available from the AD7400.
When a capacitive load is switched onto the output of an op
amp, the amplitude momentarily drops. The op amp tries to
correct the situation and, in the process, hits its slew rate limit.
This nonlinear response, which can cause excessive ringing, can
lead to distortion. To remedy the situation, a low-pass RC filter
can be connected between the amplifier and the input to the
AD7400. The external capacitor at each input aids in supplying
the current spikes created during the sampling process, and the
resistor isolates the op amp from the transient nature of the load.
The recommended circuit configuration for driving the differential
inputs to achieve best performance is shown in Figure 24. A
capacitor between the two input pins sources or sinks charge
to allow most of the charge that is needed by one input to be
effectively supplied by the other input. The series resistor again
isolates any op amp from the current spikes created during the
sampling process. Recommended values for the resistors and
capacitor are 22 and 47 pF, respectively.
R
VIN–
R
VIN+
C
AD7400
04718-
028
Figure 24. Differential Input RC Network
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