VP216

4

An on-chip bandgap voltage reference circuit combined with two op amps provide all the necessary bias voltages f

ence is taken out to pin 25, VRB.

Pin

Name

Description

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

AGND1

AGND1

AGND1

VRT

VRM

VRB

AGND2

COMP-I

AIN-I

AGND3

COMP-Q

AIN-Q

AGND4

AGC

BIAS

TANK

CLKSEL

AGND5

CLKIN

N.C.

CLKOUT

N.C.

DQ0

DQ1

DQ2

DQ3

DQ4

DQ5

DGND

DI0

DI1

DI2

DI3

DI4

DI5

N.C.

N.C.

Analog voltage supply for the 6-bit ADCs

Analog voltage supply for the 6-bit ADCs

Analog ground

Analog ground

Analog ground

3.5V reference voltage - ladder top

Reference voltage - ladder middle

2.5V reference voltage - ladder bottom

Analog voltage supply for the reference bias circuits

Analog ground

Capacitor compensation - I channel

Analog signal input - I channel

Analog ground for the I channel buffer amplifier

Analog voltage supply for the I channel buffer amplifier

Capacitor compensation - Q channel

Analog signal input - Q channel

Analog ground

Analog voltage supply for the Q channel buffer amplifier

AGC control voltage

Input bias voltage

Tank circuit connection

Clock select - VCO or external clock

Analog voltage supply for the VCO

Analog ground

Clock input positive

Not connected

Clock output positive

Not connected

Digital TTL output - LSB -Q channel

Digital TTL output - MSB - Q channel

Digital ground

Digital voltage supply

Digital TTL output - LSB - I channel

Digital TTL output - MSB - I channel

Not connected

Not connected

Table 1: Pin descriptions