AD7762

Rev. 0 | Page 7 of 28

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

64 63 62

61

60 59 58

57 56 55 54 53 52 51 50 49

47

DB13

46

DB14

45

DB15

42

DGND

43

DGND

44

48

DB12

41

40

CS

39

RD/WR

37

RESET

36

SYNC

35

DGND

34

AGND1

33

38

DRDY

2

MCLKGND

3

MCLK

4

7

AGND1

6

5

AGND2

1

DGND

8

DECAPA

9

REFGND

10

12

13

AGND2

14

15

16

AGND2

11

AGND4

PIN 1

17 18

19

20 21 22 23 24 25 26

27 28 29 30 31 32

AD7762

TOP VIEW

(Not to Scale)

Figure 4. 64-Lead TQFP Pin Configuration

Table 5. Pin Function Descriptions

Pin No.

Mnemonic

Description

6, 33

2.5 V Power Supply for Modulator. These pins should be decoupled to AGND1 with 100 nF and 10 μF

capacitors on each pin.

4, 14, 15, 27

5 V Power Supply. These pins should be decoupled to AGND2 with 100 nF capacitors on each of Pin 4,

Pin 14, and Pin 15. Pin 27 should be connected to Pin 14 via a 15 nH inductor.

24

3.3 V to 5 V Power Supply for Differential Amplifier. These pins should be decoupled to AGND3 with a

100 nF capacitor.

12

3.3 V to 5 V Power Supply for Reference Buffer. This pin should be decoupled to AGND4 with a

10 nF capacitor in series with a 10 Ω resistor.

7, 34

AGND1

5, 13, 16, 18, 28

AGND2

23, 29, 31, 32

AGND3

11

AGND4

9

REFGND

Reference Ground. Ground connection for the reference voltage.

41

2.5 V Power Supply for Digital Circuitry and FIR Filter. This pin should be decoupled to DGND with a

100 nF capacitor.

44, 63

Logic Power Supply Input, 1.8 V to 2.5 V. The voltage supplied at these pins determines the operating

voltage of the logic interface. Both these pins must be connected together and tied to the same supply.

Each pin should also be decoupled to DGND with a100 nF capacitor.

DGND

Ground Reference for Digital Circuitry.

1, 35, 42, 43,

53, 62, 64

19

Positive Input to Differential Amplifier.

20

Negative Input to Differential Amplifier.

21

Negative Output from Differential Amplifier.

22

Positive Output from Differential Amplifier.

25

Positive Input to the Modulator.

26

Negative Input to the Modulator.

10

Reference Input. The input range of this pin is determined by the reference buffer supply voltage

8

DECAPA

Decoupling Pin. A 100 nF capacitor must be inserted between this pin and AGND1.