LTC1757A-1 LINER [Linear Technology], LTC1757A-1 Datasheet - Page 12

• Manufacturer Part Number: LTC1757A-1
• Description: Single/Dual Band RF Power Controllers
• Manufacturer: LINER [Linear Technology]

LTC1757A-1/LT1757A-2
TYPICAL APPLICATIO S
RELATED PARTS
12
PART NUMBER
LTC1261
LTC1550/LTC1551
LTC1731
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] FAX: [phone] www.linear-tech.com
Li-Ion
V
Using the LTC1757A-1 in a Dual Band Cellular Telephone Transmitter Without Current Limiting
IN
68
DESCRIPTION
Regulated Inductorless Voltage Inverter
Low Noise Inductorless Voltage Inverter
Li-Ion Linear Charge Controller
SHDN
68
V
IN
Li-Ion
33pF
33pF
1
2
3
4
SHDN
V
RF
SHDN
GND
IN
LTC1757A-1
U
1
2
3
4
DAC
V
RF
SHDN
GND
TXEN
IN
PCTL
V
LTC1757A-1
V
PCA
Single Band Cellular Telephone Transmitter
CC
DAC
8
7
6
5
TXEN
PCTL
V
V
PCA
TXEN
CC
8
7
6
5
TXEN
COMMENTS
Regulated –5V from 3V, REG Pin Indicates Regulation, Up to 15mA, Micropower
Regulated Output, <1mV
Small, Thin 8-Pin MSOP, Trickle Charge, EOC Indicator, 1% Accuracy
RF POWER MODULE WITH MUX
RF
IN
V
PWRCTRL
BANDSELECT
CC
900MHz
RF1 IN
RF PA
1800MHz
1800MHz
RF2 IN
RFOUT1
900MHz
RFOUT2
P-P
Ripple, 900kHz
DIRECTIONAL
DIRECTIONAL
COUPLER
COUPLER
1757ai LT/TP 0400 4K • PRINTED IN THE USA
LINEAR TECHNOLOGY CORPORATION 2000
1757A TA02
50
50
DIPLEXER
1757A TA03