AD7765 datasheet(18/32 Pages) AD

Part #	AD7765

Description	24-Bit, 156 kSPS, 112 dB 誇-? ADC with On-Chip Buffers and Serial Interface

PDF	32 Pages

Scroll/Zoom	100%

Manufacturer	AD [Analog Devices]

Direct Link	http://www.analog.com

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18 / 32 page

AD7765

Rev. 0 | Page 18 of 32

MODULATOR INPUT STRUCTURE

Sampling Switches SS1 and SS3 are driven by ICLK, whereas

Sampling Switches SS2 and SS4 are driven by ICLK

The AD7765 employs a double-sampling front end, as shown in

. 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.

Figure 31. For simplicity, only the equivalent input circuitry for

VIN+ is shown. The equivalent circuitry for VIN− is the same.

CS2

CPB2

SS4

SH4

CPA

SS2

SH2

CS1

CPB1

SS3

SH3

SS1

SH1

ANALOG

MODULATOR

VIN+

Capacitors CPA, CPB1, and CPB2 represent parasitic capaci-

tances that include the junction capacitances associated with

the MOS switches.

Table 8. Equivalent Component Values

CS1

CS2

CPA

CPB1/2

13 pF

5 pF

Figure 31. Equivalent Input Circuit

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