Ultrasound Variable-Gain Amplifier

8

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Pin Description

PIN

NAME

FUNCTION

1, 2, 5, 6, 7, 10,

11, 12, 19, 20,

21, 24, 25, 26,

29, 30, 31, 34,

35, 36, 41, 43,

44, 45, 47, 48,

51, 55, 58, 59,

64, 65, 66, 69,

73, 76, 79, 80,

81, 83, 84, 85,

88–92, 96, 97,

98

GND

Ground

3

VGIN3-

VGA Channel 3 Inverting Differential Input

4

VGIN3+

VGA Channel 3 Noninverting Differential Input

8

VGIN4-

VGA Channel 4 Inverting Differential Input

9

VGIN4+

VGA Channel 4 Noninverting Differential Input

13

EXT_C1

External Compensation. Connect a 4.7µF capacitor to ground.

14

EXT_C2

External Compensation. Connect a 4.7µF capacitor to ground.

15

EXT_C3

External Compensation. Connect a 4.7µF capacitor to ground.

16, 39, 42, 46,

54, 72, 82, 87

pins as possible.

17

VGIN5-

VGA Channel 5 Inverting Differential Input

18

VGIN5+

VGA Channel 5 Noninverting Differential Input

22

VGIN6-

VGA Channel 6 Inverting Differential Input

23

VGIN6+

VGA Channel 6 Noninverting Differential Input

27

VGIN7-

VGA Channel 7 Inverting Differential Input

28

VGIN7+

VGA Channel 7 Noninverting Differential Input

32

VGIN8-

VGA Channel 8 Inverting Differential Input

33

VGIN8+

VGA Channel 8 Noninverting Differential Input

37, 93

VREF

5V Reference Supply. Bypass to GND with a 0.1µF capacitor as close to the pins as

possible. Note that noise performance of the device is dependent on the noise contribution

38

EXT_RES

External Resistor. Connect a 7.5kΩ resistor to ground.

40

PD

Power-Down Switch. Drive PD high to set the device in power-down mode. Drive PD low for

normal operation.

49

VGOUT8+

VGA Channel 8 Noninverting Differential Output

50

VGOUT8-

VGA Channel 8 Inverting Differential Output

52

VGOUT7+

VGA Channel 7 Noninverting Differential Output

53

VGOUT7-

VGA Channel 7 Inverting Differential Output

56

VGOUT6+

VGA Channel 6 Noninverting Differential Output

57

VGOUT6-

VGA Channel 6 Inverting Differential Output

60

VGOUT5+

VGA Channel 5 Noninverting Differential Output