ATR2731 Datasheet | Atmel

Features - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8.5V Supply Voltage Voltage Regulator for Stable Operating Conditions Microprocessor-controlled Via a Simple Two-wire Bus Two Selectable Addresses Gain-controlled RF Amplifier with Two Inputs, Selectable Via a Simple Two-wire Bus Control Balanced RF Amplifier Inputs Gain-controlled RF Mixer Four-pin Voltage-controlled Oscillator SAW Filter Driver With Differential Low-impedance Output AGC Voltage Generation for RF Section, Available at Charge-pump Output (Can Also Be Used to Control a PIN Diode Attenuator) Gain-controlled IF Amplifier Balanced IF Amplifier Inputs Selectable Gain-controlled IF Mixer Single-ended IF Output AGC Voltage Generation for IF Section, Available at Charge-pump Output Separate Differential Input for the IF AGC Block All AGC Time Constants are Adjustable AGC Thresholds Programmable Via a Simple Two-wire Bus Three AGC Charge Pump Currents Selectable (Zero, Low, High) Reference Oscillator Programmable 9-bit Reference Divider Programmable 15-bit Counter 1:2048 to 1:32767 Effectively Tri-state Phase Detector with Programmable Charge Pump Superior Phase-noise Performance Programmable Deactivation of Tuning Output Three Switching Outputs (Open Collector) Three D/A Converters (Resolution: 8 Bits) Lock Status Indication (Open Collector) DAB One-chip Front End ATR2731 Rev. 4904A- DAB- 03/06 1. Description .. The ATR2731 is a monolithically integrated Digital Audio Broadcasting one-chip front-end circuit manufactured using Atmel’s advanced UHF5S technology. Its functionality covers a gain-controlled RF amplifier with two selectable RF inputs, a gain-controlled RF mixer, a VCO which provides the LO signal for the RF mixers, either directly or after passing a frequency divider, a SAW filter driver, an AGC block for the RF section, a gain-controlled IF amplifier, an IF mixer which can also be bypassed, an AGC block for the IF section, and a fractional-N frequency synthesizer. The frequency...