LTC1758-1EMS8 Linear Technology, LTC1758-1EMS8 Datasheet
LTC1758-1EMS8
Specifications of LTC1758-1EMS8
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LTC1758-1EMS8 Summary of contents
Page 1
... PAs such as the Philips BGY280, Conexant RM009/ CX77302, Anadigics AWT6102/AWT6107 and the Hitachi PF08107/PF08123B. The LTC1758 single output RF power controller that is identical in performance to the LTC1758-2 except that one output (V be used to drive a single RF or dual channel module with integral multiplexer ...
Page 2
... IN Lead Temperature (Soldering, 10 sec)................ 300 C + 0.3V ORDER PART V 1 NUMBER SHDN 3 BSEL 4 LTC1758-1EMS8 GND 5 MS10 PACKAGE 10-LEAD PLASTIC MSOP MS8 PART MARKING T = 125 C, JMAX LTSL The denotes specifications which apply over the full operating = 3.6V, SHDN = TXEN = HI, unless otherwise noted 0mA, V ...
Page 3
... Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: The LTC1758-1 and LTC1758-2 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
... 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 (Pin 8): (LTC1758-2 Only) Power Control Voltage PCB Output. This pin drives an external RF power amplifier power control pin. The maximum load capacitance is 100pF ...
Page 5
... RF PA Li-Ion AUTOZERO – 50mV FILTER – + ICL 33k + RFDET – 22k 33k 22k COMPRESSION 22k XMT AUTOZERO 150k TXEN PCTL 7 6 LTC1758-1/LTC1758 1.8GHz/1.9GHz 50 TXENB PA ADJUSTABLE + PB CAMP – 400 A 140k VPC g 110k m 1.2V 1.2V BG1 1.2V BANDGAP ADJUSTABLE 12 PB TSDB 100 ...
Page 6
... For example, V PCB PCA a 900MHz channel and V a 1.8GHz/1.9GHz channel. PCB BSEL must be established before the part is enabled. The LTC1758-1 can be used to drive a single RF channel or dual channel with integral multiplexer Control Amplifier The control amplifier supplies the power control voltage to the RF power amplifier. A portion (typically – ...
Page 7
... The RF amplifier will then start to turn PCA on. The feedback signal from the directional coupler and the output power will be detected by the LTC1758-2 at the RF pin. The loop closes and the amplifier output tracks the DAC voltage ramping at PCTL. The RF power output will then follow the programmed power profile from the DAC ...
Page 8
... RF pin directional coupler is used recom- mended that an external 68 termination resistor be connected between the RF coupling capacitor (33pF), and ground at the side connected to the directional coupler. If the termination is placed at the LTC1758 RF pin, then the 68 resistor must be connected referenced Termination components should be IN placed adjacent to the LTC1758 ...
Page 9
... Loop voltage losses supplied by the directional coupler will improve phase margin. The larger the directional coupler loss the more stable the loop will become. How- ever, larger losses reduce the RF signal to the LTC1758 LTC1758 and detector performance may be degraded at low power PTCL levels ...
Page 10
... Bode plot. A low or V PCA PCB frequency AC SPICE model of the LTC1758 power control- ler is included to better determine pole and zero interac- tions. The user can apply external gains and poles to determine bandwidth and phase margin. DC, transient and RF information cannot be extracted from the present model ...
Page 11
... It should be remembered that models are a simplification of the actual circuit. CONTROLLED RF OUTPUT POWER 1758 F05 Figure 6. SPICE Model Open Loop Gain and Phase Characteristics from LTC1758-1/LTC1758-2 80 120 110 LOAD C = 33pF ...
Page 12
... VPCTLO, VRF, Adjust EFB gain to reflect external gain, currently set at 3X** *EFB RF 0 VPCA VIN 3 VIN VIN *VPCTLO PCTL **Open loop connections, comment-out EFB, VIN and VPCTLO** VPCTLO PCTL VRF **Add AC statement and print statement as required** .AC DEC 50 100 1E7 .END Figure 7. LTC1758 Low Frequency AC SPICE Model ...
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... U U APPLICATIO S I FOR ATIO W U LTC1758-1/LTC1758-2 13 ...
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... LTC1758-1/LTC1758-2 PACKAGE DESCRIPTIO 0.007 (0.18) 0.021 0.006 (0.53 0.015) * 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 ...
Page 15
... MAX 0 – 6 TYP SEATING PLANE 0.007 – 0.011 0.021 0.006 (0.17 – 0.27) (0.53 0.015) LTC1758-1/LTC1758 0.118 0.004** (3.00 0.102 0.034 (0.86) REF 0.005 0.002 (0.13 0.05) 0.0197 MSOP (MS10) 1100 (0 ...
Page 16
... Only Two External Components, Allows Charge Current Monitoring for Termination 40mA, No Inductors for White LED Backlight IN OUT I = 100mA, Low Noise OUT Single/Dual Channel RF Power Controller (Higher Bandwidth Version of the LTC1758) 2MHz Constant Frequency, I ThinSOT and MSOP Packages 1.4MHz Integrated Synchronous Rectification Quiescent Current DIRECTIONAL COUPLER 1758 TA02 DIRECTIONAL ...