REV. 0

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use, nor for any infringements of patents or other rights of third parties

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

a

Low Power Mixer

3 V Receiver IF Subsystem

AD61009

FEATURES

–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

Manual Gain Control

Quadrature Demodulator

On-Board Phase-Locked Quadrature Oscillator

Demodulates IFs from 1 MHz to 12 MHz

Can Also Demodulate AM, CW, SSB

Low Power

25 mW at 3 V

CMOS Compatible Power-Down

APPLICATIONS

GSM 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)

AD61009

FDIN

QOUT

IOUT

FLTR

VPS1

COM1

PRUP

LOIP

IFOP

DMIP

VPS2

RFLO

RFHI

GREF

MXOP

VMID

IFHI

IFLO

GAIN

COM2

GENERAL DESCRIPTION

The AD61009 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, and a

biasing system with external power-down.

The AD61009’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 AD61009 also

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

required LO drive to –16 dBm.

In MGC operation, the AD61009 accepts an external gain-

control voltage input from an external AGC detector or a DAC.

A quadrature VCO phase-locked to the IF drives the I and Q

demodulators. The I and Q demodulators can also demodu-

late AM; when the AD61009’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 AD61009 can be used to demodu-

late BPSK using an external Costas Loop for carrier recovery.

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

Tel: 781/329-4700

World Wide Web Site: http://www.analog.com

Fax: 781/326-8703

© Analog Devices, Inc., 2001

Monoceiver is a registered trademark of Analog Devices, Inc.