T2801_06 Datasheet, PDF (1/31 Pages) ATMEL Corporation – DECT Single-Chip Transceiver

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
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 neces-
sary in production.
Figure 1-1. Block Diagram
MIXER
OUT ^IF_IN
IF_TANK
DEMOD
TANK
CF
IR MIXER
IF AMP 1
IF AMP 2
RF_IN
RAMP_OUT
RAMP_SET
RAMP
GEN
RSSI
DEMOD
BB FILTER
D/A _{DEMOD DAC}
TX / RX
SWITCH
VCO
GF
BB_OUT
RSSI
TX_DATA
TX_OUT
PC
PD
f
:n
TX DRIVER
PU_VCO
VCO
REG
CP
AUX
REG
MCC ^3-WIRE
BUS
RC
f
:n
CTRL
LOGIC
CLOCK
DATA
ENABLE
RX_ON
TX_ON
PU_RX/TX
PU_PLL
T2801
VREG_VCO
VS_VCO
VREG VS_REG VTUNE
GND_VCO PU_REG REG_CTRL
CP
LD
I_CPSW
REF_CLK
Rev. 4567B–DECT–03/06