T2801

Features Supply Voltage Range 3V to 4.6V (Unregulated) Auxiliary Voltage Regulator On-chip Low Current Consumption Few Low Cost External Components No Mechanical Tuning Required Non-blindslot and Blindslot Operation Unlimited Multislot Operation with Advanced Closed-loop Modulation Supports Multiple Reference Clocks (10.368 MHz/13.824 MHz/20.736 MHz) TX Preamplifier with 0 dBm Output Power at 1.9 GHz and Ramp-signal Generator for SiGe Power Amplifier DECT Single-chip Transceiver T2801 1. Description The T2801 is an RF IC for low-power DECT applications. The QFN48 packaged IC is a complete transceiver including image rejection mixer, IF amplifier, FM demodulator, baseband filter, RSSI, TX preamplifier, power-ramping generator for power amplifiers, integrated synthesizer, fully integrated VCO, TX filter and modulation compensation circuit for advanced closed-loop modulation concept. No mechanical tuning is necessary in production. Figure 1-1. Block Diagram www.DataSheet4U.com MIXER IF_IN OUT IR MIXER RF_IN DEMOD TANK IF_TANK IF AMP 1 IF AMP 2 CF BB_OUT DEMOD BB FILTER RAMP_OUT RAMP_SET RAMP GEN D/A RSSI DEMOD DAC RSSI VCO TX / RX SWITCH GF TX_DATA PC TX_OUT f :n TX DRIVER PD MCC 3-WIRE BUS CLOCK DATA ENABLE PU_VCO VCO REG AUX REG CP RC f :n CTRL LOGIC RX_ON TX_ON PU_RX/TX PU_PLL VREG_VCO VS_VCO VREG VS_REG VTUNE GND_VCO PU_REG REG_CTRL CP I_CPSW LD REF_CLK Rev. 4567B–DECT–03/06 Table 1-1. Name AUX REG BBF CP DAC DEMOD GF IF AMP1 ...