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AD6458 Dataheets PDF



Part Number AD6458
Manufacturers Analog Devices
Logo Analog Devices
Description GSM 3 V Receiver IF Subsystem
Datasheet AD6458 DatasheetAD6458 Datasheet (PDF)

a FEATURES Fully Compliant with Standard and Enhanced GSM Specification –12 dBm Input 1 dB Compression Point –2 dBm Input Third Order Intercept 10 dB SSB Noise Figure (330 ⍀) DC–400 MHz RF and LO Bandwidths Linear IF Amplifier Linear-in-dB and Stable over Temperature Voltage Gain Control Quadrature Demodulator Onboard Phase-Locked Quadrature Oscillator Demodulates IFs from 5 MHz to 50 MHz Low Power 9 mA at Midgain 1 ␮ A Sleep Mode Operation 3.0 V to 3.6 V Operation Interfaces to AD7013, AD7015 a.

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a FEATURES Fully Compliant with Standard and Enhanced GSM Specification –12 dBm Input 1 dB Compression Point –2 dBm Input Third Order Intercept 10 dB SSB Noise Figure (330 ⍀) DC–400 MHz RF and LO Bandwidths Linear IF Amplifier Linear-in-dB and Stable over Temperature Voltage Gain Control Quadrature Demodulator Onboard Phase-Locked Quadrature Oscillator Demodulates IFs from 5 MHz to 50 MHz Low Power 9 mA at Midgain 1 ␮ A Sleep Mode Operation 3.0 V to 3.6 V Operation Interfaces to AD7013, AD7015 and AD6421 Baseband Converters 20-Lead SSOP GSM 3 V Receiver IF Subsystem AD6458 FUNCTIONAL BLOCK DIAGRAM LO I RF BPF PLO Q AGC FREF AD6458 GENERAL DESCRIPTION The AD6458 is a 3 V, low power receiver IF subsystem for operation at input frequencies as high as 400 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, IF amplifier, I and Q demodulators, a phase-locked quadrature oscillator, precise AGC subsystem, and a biasing system with external power-down. The low noise, high intercept mixer of the AD6458 is a doubly-balanced Gilbert cell type. It has a nominal –12 dBm input-referred 1 dB compression point and a –2 dBm inputreferred third-order intercept. The mixer section of the AD6458 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 inphase and quadrature baseband outputs to interface with Analog Devices’ AD7013 (IS54, TETRA, MSAT) and AD7015 and AD6421 (GSM, DCS1800, PCS1900) baseband converters. An onboard quadrature VCO which 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 AD6458 can also provide demodulation of N-PSK and N-QAM in many nonTDMA systems when used with external analog carrier recovery systems such as the Costas Loop. Finally, the VCO can be phase-locked to a frequency which 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 AD6458 uses supply voltages from 3.0 V to 3.6 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 1 µA. The AD6458 comes in a 20-lead shrink small outline (SSOP) surface-mount package. 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.


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