REV. 0

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a

Low Power Mixer/AGC/RSSI

3 V Receiver IF Subsystem

AD607

© Analog Devices, Inc., 1995

One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A.

Tel: 617/329-4700

Fax: 617/326-8703

FEATURES

Complete Receiver on a Chip: Monoceiver™ Mixer

–15 dBm 1 dB Compression Point

–8 dBm Input Third Order Intercept

500 MHz RF and LO Bandwidths

Linear IF Amplifier

Linear-in-dB Gain Control

MGC or AGC with RSSI Output

Quadrature Demodulator

On-Board Phase-Locked Quadrature Oscillator

Demodulates IFs from 400 kHz to 12 MHz

Can Also Demodulate AM, CW, SSB

Low Power

25 mW at 3 V

CMOS Compatible Power-Down

Interfaces to AD7013 and AD7015 Baseband Converters

APPLICATIONS

GSM, CDMA, TDMA, and TETRA Receivers

Satellite Terminals

Battery-Powered Communications Receivers

PIN CONFIGURATION

20-Lead SSOP

(RS Suffix)

14

13

12

11

17

16

15

20

19

18

10

9

8

1

2

3

4

7

6

5

TOP VIEW

(Not to Scale)

AD607

FDIN

QOUT

IOUT

FLTR

VPS1

COM1

PRUP

LOIP

IFOP

DMIP

VPS2

RFLO

RFHI

GREF

MXOP

VMID

IFHI

IFLO

GAIN/RS

COM2

GENERAL DESCRIPTION

The AD607 is a 3 V low power receiver IF subsystem for opera-

tion at input frequencies as high as 500 MHz and IFs from

400 kHz to 12 MHz. It consists of a mixer, IF amplifiers, I and

Q demodulators, a phase-locked quadrature oscillator, AGC

detector, and a biasing system with external power-down.

The AD607’s low noise, high intercept mixer is a doubly-

balanced Gilbert cell type. It has a nominal –15 dBm input

referred 1 dB compression point and a –8 dBm input referred

third-order intercept. The mixer section of the AD607 also

includes a local oscillator (LO) preamplifier, which lowers the

required LO drive to –16 dBm.

The gain control input can serve as either a manual gain control

(MGC) input or an automatic gain control (AGC) voltage-

based RSSI output. In MGC operation, the AD607 accepts an

external gain-control voltage input from an external AGC detec-

tor or a DAC. In AGC operation, an onboard detector and an

external averaging capacitor form an AGC loop that holds the

IF output level at

±300 mV. The voltage across this capacitor

then provides an RSSI output.

The I and Q demodulators provide inphase and quadrature

baseband outputs to interface with Analog Devices’ AD7013

(IS54, TETRA, MSAT) and AD7015 (GSM) baseband con-

verters. A quadrature VCO phase-locked to the IF drives the I

and Q demodulators. The I and Q demodulators can also de-

modulate AM; when the AD607’s quadrature VCO is phase

locked to the received signal, the in-phase demodulator becomes

a synchronous product detector for AM. The VCO can also be

phase-locked to an external beat-frequency oscillator (BFO),

and the demodulator serves as a product detector for CW or

SSB reception. Finally, the AD607 can be used to demodulate

BPSK using an external Costas Loop for carrier recovery.