AD7760

Rev. A | Page 9 of 36

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

AD7760

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 (Pin 7 and Pin 34, respectively)

with 100 nF and 10 µF capacitors on each pin. See the Decoupling and Layout Recommendations section

for details.

4, 14, 15, 27

5 V Power Supply. These pins should be decoupled to AGND2 (Pin 5 and Pin 13, 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. See the

Decoupling and Layout Recommendations section for details.

24

3.3 V to 5 V Power Supply for Differential Amplifier. This pin should be decoupled to AGND3 (Pin 23) with a

100 nF capacitor. See the Decoupling and Layout Recommendations section for details.

12

3.3 V to 5 V Power Supply for Reference Buffer. This pin should be decoupled to Pin 9 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 of these pins must be connected together and tied to the same supply.

Each pin should also be decoupled to DGND with a 100 nF capacitor.

1, 35, 42, 43,

53, 62, 64

DGND

Ground Reference for Digital Circuitry.

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

See the Reference Voltage Filtering section for more details.

8

DECAPA

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