AD7401
Rev. D | Page 8 of 20
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
VDD1 1
VIN+ 2
VIN– 3
NC 4
GND2
16
NC
15
VDD2
14
MCLKIN
13
NC 5
NC
12
NC 6
MDAT
11
VDD1/NC 7
NC
10
GND1 8
GND2
9
NC = NO CONNECT
AD7401
TOP VIEW
(Not to Scale)
05
851
-00
5
Figure 5. Pin Configuration
Table 8. Pin Function Descriptions
Pin No.
Mnemonic
Description
1
VDD1
Supply Voltage. 4.5 V to 5.25 V. This is the supply voltage for the isolated side of the AD7401 and is relative to GND1.
2
VIN+
Positive Analog Input. Specified range of ±200 mV.
3
VIN
Negative Analog Input. Normally connected to GND1.
4 to 6, 10,
12, 15
NC
No Connect.
7
VDD1/NC
Supply Voltage. 4.5 V to 5.25 V. This is the supply voltage for the isolated side of the AD7401 and is relative to GND1.
No Connect (NC). If desired, Pin 7 may be allowed to float. It should not be tied to ground. The AD7401 will
operate normally provided that the supply voltage is applied to Pin 1.
8
GND1
Ground 1. This is the ground reference point for all circuitry on the isolated side.
9, 16
GND2
Ground 2. This is the ground reference point for all circuitry on the nonisolated side.
11
MDAT
Serial Data Output. The single bit modulator output is supplied to this pin as a serial data stream. The bits are
clocked out on the rising edge of the MCLKIN input and valid on the following MCLKIN rising edge.
13
MCLKIN
Master Clock Logic Input. 20 MHz maximum. The bit stream from the modulator is valid on the rising edge of MCLKIN.
14
VDD2
Supply Voltage. 3 V to 5.5 V. This is the supply voltage for the nonisolated side and is relative to GND2.