LTC1758-1EMS8 Linear Technology, LTC1758-1EMS8 Datasheet - Page 4

• Manufacturer Part Number: LTC1758-1EMS8
• Description: IC RF PWR CONTRLLR SINGLE 8-MSOP
• Manufacturer: Linear Technology

Specifications of LTC1758-1EMS8

• Rf Type: Cellular, GSM, GPRS, PCS, Wireless Modem, TDMA
• Frequency: 850MHz ~ 2GHz
• Features: Single Output
• Package / Case: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

PI FU CTIO S
LTC1758-1/LTC1758-2
V
be bypassed with 0.1 F and 100pF ceramic capacitors.
Used as return for RF 200 termination.
RF (Pin 2): RF Feedback Voltage from the Directional
Coupler. Referenced to V
must be used to connect to the ground referenced direc-
tional coupler. The frequency range is 850MHz to 2000MHz.
This pin has an internal 200
Schottky diode detector and peak detector capacitor.
SHDN (Pin 3): Shutdown Input. A logic low on the SHDN
pin places the part in shutdown mode. A logic high places
the part in autozero when TXEN is low. SHDN has an inter-
nal 150k pull-down resistor to ensure that the part is in shut-
down when the drivers are in a three-state condition.
BSEL (Pin 4): (LTC1758-2 Only) Selects V
and V
resistor to ground.
GND (Pin 5/Pin 4): System Ground.
PCTL (Pin 6/Pin 5): Analog Input. The external power
control DAC drives this input. The amplifier servos the RF
4
IN
U
(Pin 1): Input Supply Voltage, 2.7V to 6V. V
PCB
U
when high. This input has an internal 150k
U
IN
(LTC1758-2/LTC1758-1)
. A coupling capacitor of 33pF
termination, an internal
PCA
when low
IN
should
power until the RF detected signal equals the DAC signal.
The input impedance is typically 90k .
TXEN (Pin 7/Pin 6): Transmit Enable Input. A logic high
enables the control amplifier. When TXEN is low and
SHDN is high the part is in the autozero mode. This input
has an internal 150k resistor to ground.
V
Output. This pin drives an external RF power amplifier
power control pin. The maximum load capacitance is
100pF. The output is capable of rail-to-rail swings at low
load currents. Selected when BSEL is high.
V
drives an external RF power amplifier power control pin.
The maximum load capacitance is 100pF. The output is
capable of rail-to-rail swings at low load currents. Selected
when BSEL is low (LTC1758-2 only).
V
has an internal 0.090 sense resistor between V
V
detect overcurrent conditions.
PCB
PCA
CC
CC
(Pin 10/Pin 8): RF Power Amplifier Supply. This pin
that senses the RF power amplifier supply current to
(Pin 9/Pin 7): Power Control Voltage Output. This pin
(Pin 8): (LTC1758-2 Only) Power Control Voltage
IN
and