AN49 Digital Audio Amplifier Gain Control using Logarithmic XICOR

The Datasheet Archive - 100 Million Datasheets from 7500 Manufacturers.

AN49 Digital Audio Amplifier Gain Control using Logarithmic XICOR

Datasheet Thumbnail

Top Searches for this datasheet

Often power amplifier stage communications device located some distance from control panel. typical solution mount volume control front panel pair shielded cables back power amplifier stage. better solution Xicor X9314 logarithmic taper digitally controlled potentiometer. This completely eliminates need shielded cables since digital located printed circuit board near level input stages power amplifier. up/down volume switches located yards away these merely speed signals.
AN49
Digital Audio Amplifier Gain Control using Logarithmic XICOR Digitally Controlled Potentiontiometers (XDCPs)
shown will advance X9314 through wiper taps about seconds. changed from suit your preference. When pushbutton switches released, delay release X9314 chip select order ensure that last increment pulse written. X9314W needs little else apply most audio circuits, been included here remove component that present input signal. Also, lowpass filter removes residual high frequency noise from digital pots' internal charge pumps. LM380 LM386 power amplifiers have fixed gains 34dB 26dB respectively. gain LM386 increased 46dB (X200) connecting 10uF capacitor from pins positive pole capacitor should connected output snubber network required stability should located close output power amplifier. These amplifiers have fairly high gain wide bandwidths, careful with trace lengths. connections these amplifiers should short direct possible.
Circuit Description
Figure shows X9314 with voltage LM386 power amplifier. This circuit will produce 250mW audio power with only source. Figure similar circuit that uses higher power LM380 capable delivering over audio source available. Either circuit will provide plenty sound intercom, communications, monitoring applications. circuit would preferred when higher ambient noise present, such automobile. 74HC132 quad Schmitt nand gate (U2) plus discretes that required interface X9314W XDCP. When either pushbutton switch, depressed, output will HIGH. This immediately brings output which enables XDCP. After short delay determined astable multivibrator (U2C) will begin generating increment pulses. frequency oscillation (and consequently speed which volume controlled) determined values
June, 2000
www.xicor.com
JACK AUDIO INPUT
AN49
.1µF
LM386
DECREASE
1N4148
1000pF
74HC132
X9134
7.5K 470pF .1µF
250µF SPEAKER .1µF
10µF
INCREASE
74HC132 1N4148
74HC132 1000pF 220K
Figure Voltage Audio Amplifier
+VBAT JACK AUDIO INPUT
10µF .1µF
DECREASE
1N4148
1000pF
74HC132
X9134
7.5K .1µF
LM386
250µF 4-16 SPEAKER .1µF
INCREASE
74HC132 1N4148
LM78L05AC2
+VBAT
74HC132 1000pF 220K .1µF
9V-16V
Figure Watt Audio Amplifier
June, 2000
www.xicor.com

AN49 Digital Audio Amplifier Gain Control using Logarithmic XICOR

Top Searches for this datasheet

Other recent searches