鈥?/div>
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 neces-
sary in production.
Figure 1-1.
Block Diagram
MIXER
IF_IN
OUT
IR MIXER
RF_IN
DEMOD
BB FILTER
RAMP_OUT
RAMP_SET
RAMP
GEN
D/A
RSSI
DEMOD DAC
RSSI
GF
TX_DATA
DEMOD
IF_TANK
IF AMP 1
IF AMP 2
BB_OUT
TANK
CF
VCO
TX / RX
SWITCH
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鈥揇ECT鈥?3/06