U2761B Datasheet, PDF (1/11 Pages) TEMIC Semiconductors – DECT RF / IF IC

DECT RF / IF IC
U2761B
Description
The U2761B is an integrated circuit manufactured in
TEMIC’s UHF5S technology, designed for DECT
application. It contains rejection mixer, IF amplifier,
FM demodulator, baseband filter, RSSI, TX preamplifier
and power-ramping generator for power amplifier.
Features
D Supply-voltage range 2.7 to 5.5 V
D Low current consumption
D Few external components
D On-chip baseband filter
D LO switch and TX preamplifier
D Ramp-signal generator for power amplifier
Block Diagram
IF_TANK1 IF_TANK2
QUAD_TANK2
QUAD_TANK1
DEMOD_OUT VS1 VS2
IF_IN1
IF_IN2
MIXER_IN1
MIXER_IN2
IF amp 1
IR mixer
IF amp 2
Demodulator
T/R switch
Bandgap
TX driver
TX_RF_OUT
Ramp
generator
Control
logic
OpAmp
+
–
OP_OUT
MIXER_OUT1
RAMP_SET
TX_ON RX_ON LO_IN2
OP_N
MIXER_OUT2
RAMP_OUT
LO_IN1
OP_P
Figure 1. Block diagram
14657
Ordering Information
Extended Type Number
U2761B
Package
SSO28
Remarks
TEMIC Semiconductor
1 (11)
Rev. A4, 10-Mar-98
Preliminary Information