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AD7764 View Datasheet(PDF) - Analog Devices

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AD7764 Datasheet PDF : 32 Pages
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MODULATOR INPUT STRUCTURE
The AD7764 employs a double-sampling front end, as shown in
Figure 37. For simplicity, only the equivalent input circuitry for
VIN+ is shown. The equivalent circuitry for VIN− is the same.
VIN+
CPA
SS1
CS1
SH3
SH1
SS3
CPB1
ANALOG
MODULATOR
SS2
CS2
SH4
SH2
SS4
CPB2
Figure 37. Equivalent Input Circuit
AD7764
Sampling Switches SS1 and SS3 are driven by ICLK, whereas
Sampling Switches SS2 and SS4 are driven by ICLK. When
ICLK is high, the analog input voltage is connected to CS1. On
the falling edge of ICLK , the SS1 and SS3 switches open and the
analog input is sampled on CS1. Similarly, when ICLK is low,
the analog input voltage is connected to CS2. On the rising edge
of ICLK, the SS2 and SS4 switches open, and the analog input is
sampled on CS2.
Capacitors CPA, CPB1, and CPB2 represent parasitic capacitan-
ces that include the junction capacitances associated with the
MOS switches.
Table 8. Equivalent Component Values
CS1
CS2
CPA
13 pF
13 pF
13 pF
CPB1/2
5 pF
Rev. 0 | Page 19 of 32
 

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