AD8348 Ver la hoja de datos (PDF) - Analog Devices

Número de pieza

componentes Descripción

Fabricante

AD8348

50 MHz to 1000 MHz Quadrature Demodulator / Compact, 28-lead TSSOP package

Analog Devices 

AD8348

Pin No.

15

17

Mnemonic

ENBL

VGIN

18, 19

24

27

MXIP, MXIN

ENVG

COM1

Description

Chip Enable Input. Active high. Threshold is equal to VS/2.

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).

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.

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.

LO Section Ground.

Equivalent

Circuit

D

D

I

D

Rev. A | Page 8 of 28

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