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Linear Technology Electronic Components Datasheet

LTC1757A-1 Datasheet

Single/Dual Band RF Power Controllers

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LTC1757A-1 pdf
LTC1757A-1/LTC1757A-2
Single/Dual Band
RF Power Controllers
FEATURES
DESCRIPTIO
s Dual Band RF Power Amplifier Control (LTC1757A-2)
s Improved Internal Schottky Diode Detector
s Wide Input Frequency Range: 850MHz to 2GHz
s Autozero Cancels Initial Offsets and Temperature
Dependent Offset Errors
s Wide VIN Range of 2.7V to 6V Allows
Direct Connection to Battery
s RF Output Power Set by External DAC
s Fast Acquire After Transmit Enable
s Internal Frequency Compensation
s Rail-to-Rail Power Control Outputs
s RF PA Supply Current Limiting
s Battery Overvoltage Protection
s Power Control Signal Overvoltage Protection
s Low Operating Current: 1mA
s Very Low Shutdown Current: < 1µA
s Available in a 8-Pin MSOP Package (LTC1757A-1)
and 10-Pin MSOP (LTC1757A-2)
U
APPLICATIO S
s Single/Dual Band GSM Cellular Telephones
s PCS Devices
s Wireless Data Modems
s TDMA Cellular Telephones
, LTC and LT are registered trademarks of Linear Technology Corporation.
The LTC®1757A-2 is a dual band RF power controller for
RF power amplifiers operating in the 850MHz to 2GHz
range. The LTC1757A is pin compatible with the LTC1757
but has improved RF detection range. The input voltage
range is optimized for operation from a single lithium-ion
cell or 3× NiMH. Several functions required for RF power
control and protection are integrated in one small 10-pin
MSOP package, thereby minimizing PCB area.
The LTC1757A-1 is a single output RF power controller
that is identical in performance to the LTC1757A-2 except
that one output (VPCA) is provided. The LTC1757A-1 can
be used to drive a single RF channel or dual channel
module with integral multiplexer. This part is available in
an 8-pin MSOP package.
RF power is controlled by driving the RF amplifier power
control pins and sensing the resultant RF output power
via a directional coupler. The RF sense voltage is peak
detected using an on-chip Schottky diode. This detected
voltage is compared to the DAC voltage at the PCTL pin
to control the output power. The RF power amplifier is
protected against high supply voltage and current and
high power control pin voltages.
Internal and external offsets are cancelled over tempera-
ture by an autozero control loop, allowing accurate low
power programming. The shutdown feature disables the
part and reduces the supply current to < 1µA.
TYPICAL APPLICATIO
LTC1757A-2 Dual Band Cellular Telephone Transmitter
68
VIN 33pF
LTC1757A-2
1 10
VIN VCC
Li-Ion
2
RF
9
VPCA
38
SHDN
SHDN
VPCB
47
BSEL
BSEL
TXEN
TXEN
5
GND
6
PCTL
900MHz
RF PA
DIRECTIONAL
COUPLER
DIPLEXER
DAC
1.8GHz /1.9GHz
RF PA
50
1757A TA01
1


Linear Technology Electronic Components Datasheet

LTC1757A-1 Datasheet

Single/Dual Band RF Power Controllers

No Preview Available !

LTC1757A-1 pdf
LTC1757A-1/LTC1757A-2
ABSOLUTE AXI U RATI GS (Note 1)
VIN to GND ............................................... – 0.3V to 6.5V
VPCA, VPCB Voltage ..................................... – 0.3V to 3V
PCTL Voltage ............................... – 0.3V to (VIN + 0.3V)
RF Voltage ........................................ (VIN – 2.2V) to 7V
IVCC, Continuous ....................................................... 1A
IVCC, 12.5% Duty Cycle .......................................... 2.5A
SHDN, TXEN, BSEL
Voltage to GND ............................ – 0.3V to (VIN + 0.3V)
IVPCA/B, 25% Duty Cycle ...................................... 20mA
Operating Temperature Range
(Note 2) ................................................. – 30°C to 85°C
Storage Temperature Range ................ – 65°C to 150°C
Maximum Junction Temperature ........................ 125°C
Lead Temperature (Soldering, 10 sec)................ 300°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
VIN 1
RF 2
SHDN 3
GND 4
8 VCC
7 VPCA
6 TXEN
5 PCTL
MS8 PACKAGE
8-LEAD PLASTIC MSOP
TJMAX = 150°C, θJA = 250°C/W
ORDER PART
NUMBER
LTC1757A-1EMS8
MS8 PART MARKING
LTPL
VIN 1
RF 2
SHDN 3
BSEL 4
GND 5
TOP VIEW
10 VCC
9 VPCA
8 VPCB
7 TXEN
6 PCTL
MS10 PACKAGE
10-LEAD PLASTIC MSOP
TJMAX = 125°C, θJA = 250°C/W
ORDER PART
NUMBER
LTC1757A-2EMS
MS10 PART MARKING
LTPM
Consult factory for Industrial and Military grade parts.
ELECTRICAL CHARACTERISTICS The q denotes specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 3.6V, SHDN = TXEN = HI, unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VIN Operating Voltage
IVIN Shutdown Current
IVIN Autozero Current
IVIN Operating Current
IVCC Current Limit
VIN to VCC Resistance
VPCA/B VOL
VPCA/B Dropout Voltage
VPCA/B Voltage Clamp
VPCA/B Output Current
VPCA/B Enable Time
VPCA/B Bandwidth
VPCA/B Load Capacitance
VPCA/B Slew Rate
VPCA/B Droop
VPCA/B TXEN Start Voltage
SHDN Input Threshold
TXEN, BSEL Input Threshold
(Note 7)
SHDN = LO, TXEN = LO, BSEL = LO
SHDN = HI, TXEN = LO
SHDN = HI, TXEN = HI, IVPCA = IVPCB = 0mA, VPCA/B = HI
SHDN = LO, TXEN = LO
TXEN = HI, Open Loop, PCTL = – 100mV
ILOAD = 5.5mA, VIN = 2.7V
RLOAD = 400
VPCA/B = 2.4V, VIN = 2.7V
VPCTL = 2V Step, CLOAD = 100pF (Note 5)
CLOAD = 100pF, RLOAD = 400(Note 9)
(Note 6)
VPCTL = 2V Step, CLOAD = 100pF (Note 3)
VIN = 2.7V, VPCTL = 2V Step
Open Loop, TXEN Low to High, CLOAD = 100pF (Note 10)
VIN = 2.7V to 6V, TXEN = LO
VIN = 2.7V to 4.7V
q 2.7
q
q
q
q
q
q 2.7
q 5.5
q 250
1.5
400
q 0.35
q 0.35
6V
1 µA
0.9 1.5 mA
1 1.6 mA
2.2 A
90 150 m
0 0.1
V
VIN – 0.28
2.85 3.0
V
V
9 mA
200 ns
400 550 kHz
100 pF
3 V/µs
±10 µV/ms
550 700 mV
1.4 V
1.4 V
2


Part Number LTC1757A-1
Description Single/Dual Band RF Power Controllers
Maker Linear Technology
Total Page 16 Pages
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