AD61009 Datasheet | Analog Devices

FEATURES plete Receiver-on-a-Chip: Monoceiver® Mixer - 15 d Bm 1 d B pression Point - 8 d Bm Input Third Order Intercept 500 MHz RF and LO Bandwidths Linear IF Amplifier Linear-in-d B 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 m W at 3 V CMOS patible Power-Down APPLICATIONS GSM and TETRA Receivers Satellite Terminals Battery-Powered munications Receivers Low Power Mixer 3 V Receiver IF Subsystem PIN CONFIGURATION 20-Lead SSOP (RS Suffix) FDIN 1 20 VPS1 1 2 19 FLTR PRUP 3 18 IOUT LOIP 4 17 QOUT RFLO 5 AD61009 16 VPS2 RFHI TOP VIEW (Not to Scale) DMIP GREF 7 14 IFOP MXOP 8 13 2 VMID 9 12 GAIN IFHI 10 11 IFLO GENERAL DESCRIPTION The AD61009 is a 3 V low power receiver IF subsystem for operation at input frequencies as high as 500 MHz and IFs from 400 k Hz 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 doublybalanced Gilbert cell type. It has a nominal - 15 d Bm input referred 1 d B pression point and a - 8 d Bm 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 d Bm. In MGC operation, the AD61009 accepts an external gaincontrol 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 demodulate AM; when the AD61009’s quadrature VCO is phase locked to the received signal, the in-phase demodulator bees 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 demodulate...