LTC1757A-1 LINER [Linear Technology], LTC1757A-1 Datasheet
LTC1757A-1
Available stocks
Related parts for LTC1757A-1
LTC1757A-1 Summary of contents
Page 1
... 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 single output RF power controller that is identical in performance to the LTC1757A-2 except that one output (V be used to drive a single RF channel or dual channel module with integral multiplexer ...
Page 2
... – 2.2V Storage Temperature Range ................ – 150 C IN Maximum Junction Temperature ........................ 125 C Lead Temperature (Soldering, 10 sec)................ 300 C + 0.3V ORDER PART NUMBER LTC1757A-1EMS8 RF 2 SHDN 3 BSEL 4 GND 5 MS8 PART MARKING MS10 PACKAGE 10-LEAD PLASTIC MSOP T = 125 C, LTPL JMAX ...
Page 3
... Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: The LTC1757A-1 and LTC1757A-2 are guaranteed to meet performance specifications from Specifications over the – operating temperature range are assured by design, characterization and correlation with statistical process controls ...
Page 4
... RF INPUT POWER (dBm CTIO S (LTC1757A-2/LTC1757A-1) V (Pin 1): Input Supply Voltage, 2. bypassed with 0.1 F and 100pF ceramic capacitors. Used as return for RF 175 termination. RF (Pin 2): RF Feedback Voltage from the Directional Coupler. Referenced coupling capacitor of 33pF ...
Page 5
... DIPLEXER 900MHz RF PA Li-Ion AUTOZERO – 50mV – + 6pF ICL + 33k RFDET – 16.7k 33k 1.2V 33k 600mV XMT AUTOZERO 150k TXEN PCTL 7 6 LTC1757A-1/LTC1757A 1.8GHz 50 TXENB PA + ADJ – CAMP – 400 A 140k VPC g 110k m 1.2V OVP g m 173k V IN 54.5k 12 ...
Page 6
... V a 1.8GHz/1.9GHz channel. PCB BSEL must be established before the part is enabled. The LTC1757A-1 can be used to drive a single RF channel or dual channel module with integral multiplexer. Control Amplifier The control amplifier supplies the power control voltage to the RF power amplifier. A portion (typically – 19dB for low frequencies and – ...
Page 7
... Shutdown Autozero Enable LTC1757A-1 Description The LTC1757A-1 is identical in performance to the LTC1757A-2 except that only one control output (V is available. The LTC1757A-1 can drive a single RF and V PCA PCB channel in the 850MHz to 2GHz range or a dual RF channel module with an internal multiplexer. Several and ...
Page 8
... LTC1757A-1/LT1757A APPLICATIO S I FOR ATIO External Termination The LTC1757A has an internal 175 termination resistor at the RF pin directional coupler is used recommended that an external 68 termination resistor be connected between the RF coupling capacitor (33pF), and ground at the side connected to the directional coupler ...
Page 9
... The additional gain supplied by the RF power amplifier increases the loop gain raising poles normally below the 0dB axis. The extra gain can vary significantly over input/ output power ranges, frequency, power supply, tempera- ture and manufacturer. RF power amplifier gain control LTC1757A-1/LTC1757A-2 3dB DIRECTIONAL ATTENUATOR COUPLER ...
Page 10
... LTC1757A-1/LT1757A APPLICATIO S I FOR ATIO transfer functions are often not available and must be generated by the user. Loop oscillations are most likely to occur in the midpower range where the external gain associated with the RF power amplifier typically peaks useful to measure the oscillation or ringing frequency to determine whether it corresponds to the expected loop bandwidth and thus is due to high gain bandwidth ...
Page 11
... DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE ** DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS. INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE LTC1757A-1/LTC1757A-2 U Dimensions in inches (millimeters) unless otherwise noted. MS8 Package ...
Page 12
... LTC1757A-1/LT1757A-2 U TYPICAL APPLICATIO S 68 33pF Li-Ion 3 SHDN 4 Using the LTC1757A Dual Band Cellular Telephone Transmitter Without Current Limiting 68 33pF LTC1757A Li-Ion RF 3 SHDN SHDN 4 GND DAC RELATED PARTS PART NUMBER DESCRIPTION LTC1261 Regulated Inductorless Voltage Inverter ...