REV. 0

AD8346

–4–

PIN FUNCTION DESCRIPTIONS

Equivalent

Pin

Name

Description

Circuit

1

IBBP

I Channel Baseband Positive Input Pin. Input should be dc biased to approximately 1.2 V.

Circuit A

Nominal characterized ac swing is 1 V p-p (0.7 V to 1.7 V). This makes the differential

input 2 V p-p when IBBN is 180 degrees out of phase from IBBP.

2

IBBN

I Channel Baseband Negative Input Pin. Input should be dc biased to approximately 1.2 V.

Circuit A

Nominal characterized ac swing is 1 V p-p (0.7 V to 1.7 V). This makes the differential

input 2 V p-p when IBBN is 180 degrees out of phase from IBBP.

3

COM1

Ground pin for the LO phase splitter and LO buffers.

4

COM1

Ground pin for the LO phase splitter and LO buffers.

5

LOIN

LO Negative Input Pin. Internal dc bias (approximately VPS1–800 mV) is supplied. This

Circuit B

pin must be ac coupled.

6

LOIP

LO Positive Input Pin. Internal dc bias (approximately VPS1–800 mV) is supplied. This

Circuit B

pin must be ac coupled.

7

VPS1

Power supply pin for the bias cell and LO buffers. This pin should be decoupled using

local 100 pF and 0.01

µF capacitors.

8

ENBL

Enable Pin. A high level enables the device; a low level puts the device in sleep mode.

Circuit C

9

COM2

Ground pin for the input stage of output amplifier.

10

COM3

Ground pin for the output stage of output amplifier.

11

VOUT

50

Ω DC Coupled RF Output. User must provide ac coupling on this pin.

Circuit D

12

VPS2

Power supply pin for Baseband input voltage to current converters and mixer core. This pin

should be decoupled using local 100 pF and 0.01

µF capacitors.

13

COM4

Ground pin for Baseband input voltage to current converters and mixer core.

14

COM4

Ground pin for Baseband input voltage to current converters and mixer core.

15

QBBN

Q Channel Baseband Negative Input. Input should be dc biased to approximately 1.2 V.

Circuit A

Nominal characterized ac swing is 1 V p-p. This makes the differential input 2 V p-p when

QBBN is 180 degrees out of phase from QBBP.

16

QBBP

Q Channel Baseband Positive Input. Input should be dc biased to approximately 1.2 V.

Circuit A

Nominal characterized ac swing is 1 V p-p. This makes the differential input 2 V p-p when

QBBN is 180 degrees out of phase from QBBP.

3k

9k

VPS2

INPUT

BUFFER

TO MIXER

CORE

ACTIVE LOADS

Circuit A

VPS1

LOIN

LOIP

PHASE

SPLITTER

CONTINUES

Circuit B

40k

30k

VPS1

TO BIAS FOR

STARTUP/

SHUTDOWN

780

75k

ENBL

75k

Circuit C

43

43

VPS2

Circuit D

Figure 1. Equivalent Circuits