器件名称: U2761B
功能描述: DECT RF / IF IC
文件大小: 426.53KB 共12页
简 介:U2761B
DECT RF / IF IC
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
QUAD_TANK2 IF_TANK1 IF_TANK2 QUAD_TANK1 DEMOD_OUT VS1 VS2
IF_IN1 IF_IN2
IF amp 1
IF amp 2
Demodulator Bandgap
MIXER_IN1 MIXER_IN2
IR mixer
T/R switch
TX driver TX_RF_OUT
Ramp generator
Control logic
+ –
OpAmp OP_OUT
MIXER_OUT1
RAMP_SET TX_ON MIXER_OUT2 RAMP_OUT
LO_IN2 RX_ON OP_N LO_IN1 OP_P
14657
Figure 1. Block diagram
Ordering Information
Extended Type Number U2761B Package SSO28 Remarks
TEMIC Semiconductor Rev. A4, 10-Mar-98
1 (11)
Preliminary Information
U2761B
Pin Description
RSSI PU
1 2
28 OP_OUT 27 OP_P 26 OP_N
IF_TANK1 3 IF_TANK2 4 GND1 5
25 DEMOD_OUT 24 QUAD_TANK2 23 QUAD_TANK1 22 GND3 21 LO_IN2
MIXER_IN1 6 MIXER_IN2 7 GND2 8 TX_RF_OUT 9 VS1 10 IF_IN1 11 IF_IN2 12 RAMP_OUT 13 RAMP_SET 14
14808
20 LO_IN1 19 VS2
18 MIXER_OUT2 17 MIXER_OUT1
16 TX_ON 15 RX_ON
Figure 2. Pinning
Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 2……