T2802 Datasheet, PDF (1/29 Pages) ATMEL Corporation – 2.4 GHz WDECT/ISM SINGLE-CHIP TRANSCEIVER

Features
• Fully Integrated TX/RX with VCO
• Fast Settling Synthesizer
• Unlimited Multi-slot Operation with Advanced Closed-loop Modulation
• No Mechanical Tuning Required
• Low Current Consumption
• Auxiliary Voltage Regulator On-chip (3.2 V to 4.6 V)
• Supply-voltage Range 3 V to 4.6 V (Regulated)
• Ramp-signal Generator for Power Ramping and Power Control of External SiGe Power
Amplifier (T7024 and T7026)
• Supports Multiple Reference Clocks (10.368 MHz/13.824 MHz/20.736 MHz/27.648 MHz)
• TX Preamplifier with 3 dBm Output Power at 2.45 GHz
• Few Low-cost External Components
Electrostatic sensitive device.
Observe precautions for handling.
2.4 GHz
WDECT/ISM
Single-chip
Transceiver
Description
The T2802 is an RF IC for low-power applications in the 2.45 GHz ISM band. 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.
T2802
Preliminary
Figure 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
RAMP
D/A
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
VREG_VCO
VS_VCO
VREG VS_REG VTUNE
GND_VCO PU_REG REG_CTRL
CP
LD
I_CPSW
REF_CLK
Rev. 4509F–DECT–10/03