LTC4402-2 Linear Technology, LTC4402-2 Datasheet

Page 1

... RF power amplifiers operating in the 300MHz to 2.4GHz range. The LTC4402-2 has two outputs to control dual T PA modules with two control inputs. An internal sample and hold circuit enables the LTC4402 used with AM modulation via the carrier or PA supply. The input voltage range is optimized for operation from a single lithium-ion cell or 3 NiMH ...

Page 2

... V = High PCTL HOLD High to Hold Switch Opening HOLD = 2. 2. 3.6V HOLD IN www.DataSheet4U.com ORDER PART TOP VIEW NUMBER BSEL LTC4402-2EMS 8 V HOLD 7 SHDN 6 PCTL MS PART MARKING MS PACKAGE = 125 C, = 160 C/W JA LTXH unless otherwise noted. IN MIN TYP MAX 2 ...

Page 3

... RF INPUT POWER (dBm) 4402 G02 V (Pin 3): (LTC4402-2 Only) Power Control Voltage should PCB IN 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. ...

Page 4

... V (Pin 7/8): Asserted high prior to AM modulation, HOLD opens control loop and holds voltage at V EDGE modulation. BSEL (Pin 9): (LTC4402-2 Only) Selects V and V PCB resistor to ground. RF (Pin 8/10): Coupled RF Feedback Voltage . This input is referenced to V 2400MHz. This pin has an internal 250 termination, an internal Schottky diode detector and peak detector capacitor ...

Page 5

... overvoltage clamp, com- PCA PCB PCA/B pression and a bandgap reference. Band Selection The LTC4402-2 is designed for multiband operation. The BSEL pin will select output V PCA V when high. For example, V PCB PCA an 850MHz/900MHz channel and V channel. BSEL must be established before the part is enabled ...

Page 6

... This closes the RF power control loop and the RF power is then controlled during ramp down. LTC4402-1 Description The LTC4402-1 is identical in performance to the LTC4402-2 except that only one control output (V available. The LTC4402-1 can drive a single band (300MHz to 2400MHz dual RF channel module with an internal multiplexer. Several manufacturers offer dual RF channel modules with an internal multiplexer ...

Page 7

... The range of decoupling capacitor values is typically 1nF to 3 Poor layout techniques associated with the coupler network may result in high frequency signals bypassing the coupler. This could result in stability problems due to the reduction in the coupler loss. LTC4402-1/LTC4402-2 www.DataSheet4U.com conditions. The oscillation fre- SWR 4402f 7 ...

Page 8

... LTC4402-1/LTC4402 APPLICATIO S I FOR ATIO Determining External Loop Gain and Bandwidth The external loop voltage gain contributed by the RF chan- nel and coupler network should be measured in a closed loop configuration. A voltage step is applied to PCTL and the change measured. The detected RF ...

Page 9

... In no event will Linear Technology be liable for special, collat- eral, incidental or consequential damages in connection with or arising out of the use of this model. It should be remembered that models are a simplification of the actual circuit. LTC4402-1/LTC4402-2 www.DataSheet4U.com 4402f 9 ...

Page 10

... LTC4402-1/LTC4402 APPLICATIO S I FOR ATIO *LTC4402-X Low Frequency AC Spice Model* *Main Network Description GGIN1 ND3 0 ND2 IFB 86E-6 GGXFB IFB 0 0 ND12 33E-6 GGX5 ND11 0 0 ND10 1E-6 GGX6 ND12 0 0 ND11 1E-6 GGX1 ND4 0 0 ND3 1E-6 GGX2 ND6 0 0 ND4 1E-6 ...

Page 11

... DETAIL “A” 0.254 (.010) 0 – 6 TYP 0.53 0.152 (.021 .006) 1.10 (.043) DETAIL “A” MAX SEATING PLANE 0.17 – 0.27 (.007 – .011) 0.50 TYP (.0197) BSC LTC4402-1/LTC4402-2 www.DataSheet4U.com POWER MODULE 33pF Li-Ion LTC4402-1 WITH MUX OUT1 900MHz ...

Page 12

... LTC4402-1/LTC4402-2 RELATED PARTS PART NUMBER DESCRIPTION LTC1261 Regulated Inductorless Voltage Inverter LTC1732 Li-Ion Linear Charger TM LTC1734/ ThinSOT Li-Ion Battery Charger LTC1734L LTC1754 ThinSOT Charge Pump LTC1757A RF Power Controller LTC1758 RF Power Controller LTC1957 RF Power Controller LTC4052 Li-Ion Pulse Charger LTC4400 SOT- Controller ...