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AD6459ARS 数据表(PDF) 1 Page - Analog Devices |
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AD6459ARS 数据表(HTML) 1 Page - Analog Devices |
1 / 12 page REV. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its 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 AD6459 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 World Wide Web Site: http://www.analog.com Fax: 617/326-8703 © Analog Devices, Inc., 1996 GSM 3 V Receiver IF Subsystem FUNCTIONAL BLOCK DIAGRAM BPF PLL LO I Q GAIN CONTROL FREF RF AD6459 FEATURES Fully Compliant with Standard and Enhanced GSM Specification –11 dBm Input 1 dB Compression Point 0 dBm Input Third Order Intercept 10 dB SSB Noise Figure (50 ) DC-500 MHz RF and LO Bandwidths Linear IF Amplifier Linear-in-dB and Stable over Temperature Voltage Gain Control Quadrature Demodulator On-Board Phase-Locked Quadrature Oscillator Demodulates IFs from 5 MHz to 50 MHz Low Power 8 mA at Midgain 2 A Sleep Mode Operation 2.7 V to 5.5 V Operation Interfaces to AD7013, AD7015 and AD6421 Baseband Converters 20-Lead SSOP GENERAL DESCRIPTION The AD6459 is a 3 V, low power receiver IF subsystem for operation at input frequencies as high as 500 MHz and IFs from 5 MHz up to 50 MHz. It is optimized for operation in GSM, DCS1800 and PCS1900 receivers. It consists of a mixer, an IF amplifier, I and Q demodulators, a phase-locked quadra- ture oscillator, a precise AGC subsystem, and a biasing system with external power-down. The AD6459’s low noise, high intercept mixer is a doubly- balanced Gilbert-Cell type. It has a nominal –11 dBm input- referred 1 dB compression point and a 0 dBm input-referred third-order intercept. The mixer section of the AD6459 also includes a local oscillator (LO) preamplifier, which lowers the required LO drive to –16 dBm. The gain control input accepts an external gain-control voltage input from an external AGC detector or a DAC. It provides an 80 dB gain range with 27 mV/dB gain scaling. The I and Q demodulators provide in-phase and quadrature baseband outputs to interface with Analog Devices’ AD7013 (IS54, TETRA, MSAT) AD7015 and AD6421 (GSM, DCS1800, PCS1900) baseband converters. An on-board quadrature VCO that is externally phase-locked to the IF signal drives the I and Q demodulators. This locked reference signal is normally provided by an external VCTCXO under the control of the radio’s digital processor. The AD6459 can also provide demodulation of N-PSK and N-QAM in many non-TDMA systems when used with external analog carrier recovery systems such as the Costas Loop. Finally, the VCO can be phase-locked to a frequency that is deliberately offset from the IF as in the case of a Beat-Frequency oscillator (BFO) resulting in the product detection of CW or SSB. The AD6459 uses supply voltages from 2.7 V to 5.5 V over the temperature range of –40 °C to +85°C. Operation is enabled by a CMOS logical level; response time is typically < 80 µs. When disabled, the standby current is reduced to 2 µA. The AD6459 comes in a 20-pin shrink small outline (SSOP) surface mount package. |
类似零件编号 - AD6459ARS |
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类似说明 - AD6459ARS |
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