AD5381

Data Sheet

Rev. D | Page 14 of 40

PIN CONFIGURATIONAND FUNCTION DESCRIPTIONS

RESET

DB5

DB4

DB3

DB2

DB1

DB0

NC

NC

REG0

REG1

VOUT23

VOUT22

VOUT21

VOUT20

AVDD3

AGND3

DAC_GND3

SIGNAL_GND3

VOUT19

VOUT18

VOUT17

VOUT16

AVDD2

AGND2

59

74

75

69

70

71

72

67

68

66

73

64

65

60

61

62

63

57

58

55

56

53

54

52

51

5

4

3

2

7

6

9

8

1

14

13

12

11

16

15

17

10

19

18

23

22

21

20

24

25

FIFO EN

CLR

VOUT24

VOUT25

VOUT26

VOUT27

SIGNAL_GND4

DAC_GND4

AGND4

AVDD4

VOUT28

VOUT29

VOUT30

VOUT31

REFGND

REFOUT/REFIN

SIGNAL_GND1

DAC_GND1

AVDD1

VOUT0

VOUT1

VOUT2

VOUT3

VOUT4

AGND1

PIN 1

IDENTIFIER

AD5381

TOP VIEW

(Not to Scale)

NC = NO CONNECT

Figure 8. 100-Lead LQFP Pin Configuration

Table 9. PinFunction Descriptions

Mnemonic

Function

VOUTx

Buffered Analog Outputs forChannel x. Each analogoutput is driven by a rail-to-rail output amplifier operating at a

gain of 2. Each output is capable of driving an output load of 5 kΩ to ground. Typical output impedance is 0.5 Ω.

SIGNAL_GND(1–5)

Analog Ground Reference Points for Each Group of Eight Output Channels. All SIGNAL_GND pins are tied together

internally and should be connected to the AGND plane as close as possible to the AD5381.

DAC_GND(1–5)

Each group of eight channels contains a DAC_GND pin. This is the ground reference point for the internal 12-bit DAC.

These pins shound be connected to the AGND plane.

AGND(1–5)

Analog Ground Reference Point. Each group of eight channels contains an AGND pin. All AGND pins should be

connected externally to the AGND plane.

AVDD(1–5)

Analog Supply Pins. Each group of eight channels has a separate AVDD pin. These pins are shorted internallyand

should be decoupled with a 0.1 µF ceramic capacitor and 10 µF tantalum capacitor. Operating range for the

AD5381-5 is 4.5 V to 5.5 V; operating range for the AD5381-3 is 2.7 V to 3.6 V.

DGND

Ground for All Digital Circuitry.

DVDD

Logic Power Supply. Guaranteed operating range is 2.7 V to 5.5 V. It is recommended that these pins be decoupled

with a 0.1 µF ceramic and a 10 µF tantalum capacitors to DGND.

REFGND

Ground Reference Point for the Internal Reference.