AD7401A
Rev. C | Page 9 of 20
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
V
DD1
1
V
IN
+
2
V
IN
–
3
NC
4
GND
2
16
NC
15
V
DD2
14
MCLKIN
13
NC
5
NC
12
NC
6
MDAT
11
V
DD1
/NC
7
NC
10
GND
1
8
GND
2
9
NC = NO CONNECT
AD7401A
TOP VIEW
(Not to Scale)
07332-005
Figure 5. Pin Configuration
Table 8. Pin Function Descriptions
Pin No. Mnemonic Description
1 V
DD1
Supply Voltage, 4.5 V to 5.5 V. This is the supply voltage for the isolated side of the AD7401A and is relative to GND
1
.
2 V
IN
+ Positive Analog Input. Specified range of ±250 mV.
3 V
IN
−
Negative Analog Input. Normally connected to GND
1
.
4 to 6, 10,
12, 15
NC No Connect.
7 V
DD1
/NC
Supply Voltage. 4.5 V to 5.5 V. This is the supply voltage for the isolated side of the AD7401A and is relative to
GND
1
.
No Connect (NC). If desired, Pin 7 may be allowed to float. It should not be tied to ground. The AD7401A will
operate normally provided that the supply voltage is applied to Pin 1.
8 GND
1
Ground 1. This is the ground reference point for all circuitry on the isolated side.
9, 16 GND
2
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 V
DD2
Supply Voltage. 3 V to 5.5 V. This is the supply voltage for the nonisolated side and is relative to GND
2
.
