AD7403BRIZ datasheet(10/25 Pages) AD

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Data Sheet

AD7403

PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS

VDD1 1

VIN+ 2

VIN– 3

GND1 4

GND2

NIC2

VDD2

MCLKIN

NIC1

NIC2

NIC1

MDAT

VDD1 7

NIC2

GND1 8

GND2

1NIC = NOT INTERNALLY CONNECTED. CONNECT TO VDD1, GND1, OR LEAVE FLOATING.

2NIC = NOT INTERNALLY CONNECTED. CONNECT TO VDD2, GND2, OR LEAVE FLOATING.

AD7403

TOP VIEW

(Not to Scale)

Figure 5. AD7403 Pin Configuration

Table 10. AD7403 Pin Function Descriptions

Pin No.

Mnemonic

Description

1, 7

VDD1

Supply Voltage, 4.5 V to 5.5 V. This is the supply voltage for the isolated side of the AD7403 and is relative to GND1.

For device operation, connect the supply voltage to both Pin 1 and Pin 7. Decouple each supply pin to GND1 with

a 10 µF capacitor in parallel with a 1 nF capacitor.

VIN+

Positive Analog Input.

VIN−

Negative Analog Input. Normally connected to GND1.

4, 8

GND1

Ground 1. This pin is the ground reference point for all circuitry on the isolated side.

5, 6

NIC

Not Internally Connected. These pins are not internally connected. Connect to VDD1, GND1, or leave floating.

9, 16

GND2

Ground 2. This pin is the ground reference point for all circuitry on the nonisolated side.

10, 12, 15

NIC

Not Internally Connected. These pins are not internally connected. Connect to VDD2, GND2, or leave floating.

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 are valid on the following MCLKIN rising edge.

MCLKIN

Master Clock Logic Input. 5 MHz to 20 MHz frequency range. The bit stream from the modulator is propagated on

the rising edge of the MCLKIN.

VDD2

Supply Voltage, 3 V to 5.5 V. This is the supply voltage for the nonisolated side and is relative to GND2. Decouple

this supply to GND2 with a 100 nF capacitor.

VDD1 1

VDD2

VIN+ 2

VIN– 3

GND1 4

MCLKIN

MDAT

GND2

AD7403-8

TOP VIEW

(Not to Scale)

Figure 6. AD7403-8 Pin Configuration

Table 11. AD7403-8 Pin Function Descriptions

Pin No.

Mnemonic

Description

VDD1

Supply Voltage, 4.5 V to 5.5 V. This is the supply voltage for the isolated side of the AD7403-8 and is relative to GND1.

For device operation, connect the supply voltage to both Pin 1 and Pin 7. Decouple each supply pin to GND1 with

a 10 µF capacitor in parallel with a 1 nF capacitor.

VIN+

Positive Analog Input.

VIN−

Negative Analog Input. Normally connected to GND1.

GND1

Ground 1. This pin is the ground reference point for all circuitry on the isolated side.

GND2

Ground 2. This pin is the ground reference point for all circuitry on the nonisolated side.

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 are valid on the following MCLKIN rising edge.

MCLKIN

Master Clock Logic Input. 5 MHz to 20 MHz frequency range. The bit stream from the modulator is propagated on

the rising edge of the MCLKIN.

VDD2

Supply Voltage, 3 V to 5.5 V. This is the supply voltage for the nonisolated side and is relative to GND2. Decouple

this supply to GND2 with a 100 nF capacitor.

Rev. B | Page 9 of 24

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