AD607 Datasheet, PDF (1/24 Pages) Analog Devices – Low Power Mixer/AGC/RSSI 3 V Receiver IF Subsystem

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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
Low Power Mixer/AGC/RSSI
3 V Receiver IF Subsystem
AD607
PIN CONFIGURATION
20-Lead SSOP
(RS Suffix)
FDIN 1
20 VPS1
COM1 2
19 FLTR
PRUP 3
18 IOUT
LOIP 4
17 QOUT
RFLO 5 AD607 16 VPS2
RFHI
6
TOP VIEW
(Not to Scale)
15
DMIP
GREF 7
14 IFOP
MXOP 8
13 COM2
VMID 9
12 GAIN/RS
IFHI 10
11 IFLO
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.
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.
© Analog Devices, Inc., 1995
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