AD8348

Rev. A | Page 8 of 28

Pin No.

Mnemonic

Description

Equivalent

Circuit

15

ENBL

D

17

VGIN

Gain Control Input. The voltage on this pin controls the gain on the IF VGA. The gain

control voltage range is from 0.2 V to 1.2 V and corresponds to a conversion gain range

from +25.5 dB to −18.5 dB. This is the gain to the output of the mixers (that is, IMXO and

QMXO). There is an additional 20 dB of fixed gain in the final baseband amplifiers (IAIN to

IOPP/IOPN and QAIN to QOPP/QOPN). Note that the gain control function has a negative

sense (that is, increasing voltage decreases gain).

D

18, 19

MXIP, MXIN

Auxiliary Mixer Inputs. If ENVG is low, the IFIP and IFIN inputs are disabled and MXIP and

MXIN are enabled, allowing the VGA to be bypassed. The auxiliary mixer inputs are fully

differential inputs that should be ac-coupled to the signal source.

I

24

ENVG

Active High VGA Enable. When ENVG is high, IFIP and IFIN inputs are enabled and MXIP

and MXIN inputs are disabled. When ENVG is low, MXIP and MXIN inputs are enabled and

IFIP and IFIN inputs are disabled.

D

27

COM1

LO Section Ground.