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AIC1841

Analog Intergrations Corporation
Part Number AIC1841
Manufacturer Analog Intergrations Corporation
Description REGULATED GaAsFET BIAS
Published Jun 16, 2015
Detailed Description PRELIMINARY AIC1840/1841 LOW-NOISE, REGULATED GaAsFET BIAS SPEC NO: DS-1840-P2 ! FEATURES " Low Output Noise: 2mV Ripp...
Datasheet PDF File AIC1841 PDF File

AIC1841
AIC1841

Overview
PRELIMINARY AIC1840/1841 LOW-NOISE, REGULATED GaAsFET BIAS SPEC NO: DS-1840-P2 ! FEATURES " Low Output Noise: 2mV Ripple.
" Work with Small Capacitors (as Low as 0.
22µF).
" Fixed -2V or Adjustable Output.
" 2.
5V to 6.
5V Input Voltage Range.
" Switching Frequency: 104KHz in Normal Operation.
" 1µA Maximum in Shutdown Mode.
! APPLICATIONS " Cellular Phones.
" GaAsFET Power Amplifier Modules.
" Personal Communicators and PDAs.
" Wireless Data Loggers.
" LCD Bias Contrast Control.
" Regulated Negative Power Supplies.
! DESCRIPTION The AIC1840/1841 is a switched-capacitor voltage inverter that generates a regulated fixed -2.
0V or externally adjustable output.
An internal linear post-regulator reduces the output voltage ripple to less than 2mV, making the AIC1840/1841 excellent for use as bias voltage generator for transmitter GaAsFETs in portable RF and cellular telephone applications.
The operation voltage is as low as 2.
5V.
The AIC1840/1841 offers a -2V preset output as well as a -1.
3V to -3.
0V adjustable output.
Input voltage range for AIC1840/1841 is 2.
5V to 6.
5V.
Output current is 5mA at VOUT= -2V and with VIN≥2.
5V.
Quiescent current is 510µA at VIN=3.
6V and reduces to less than 1µA in shutdown mode (3µA max.
for the AIC1841).
! TYPICAL APPLICATION CIRCUIT The AIC1840 has an active-low shutdown input, while the AIC1841 has an active-high shutdown input.
VBAT (+2.
5 ~ +6.
5V) VTX C3 3.
3µF + C8 L1 C9 RF INPUT 8 RF POWER AMPLIFIER L2 T1 C1 3.
3µF + 1 2 VDD CAPP VOUT 6 VOUT(VGS)= -2.
0V CAPN C4 3 AIC1841 3.
3µF + C5 C2 3.
3µF VNN 5 4 FB SHDN GND + 7 VSHDN R1 C6 C7 T2 C11 C10 RF OUTPUT Bias Generator for GaAsFET Power Amplifier ! ORDERING INFORMATION AIC1840 XX AIC1841 XX PACKAGE TYPE N: PLASTIC DIP S: SMALL OUTLINE TEMPERATURE RANGE C: 0°C~+70°C ORDER NUMBER AIC1840CN AIC1841CN (PLASTIC DIP) AIC1840CS AIC1841CS (PLASTIC SO) PIN CONFIGURATION TOP VIEW CAPP 1 CAPN 2 VNN 3 SHDN 4 (AIC1840) *SHDN (AIC1841) 8 VDD 7 GND 6 VOUT 5 FB ANALO...


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