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| Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw 6 Channel Volume Control PT2325 DESCRIPTION The volume controller is a basic function in an audio system, in a modern multi-channel system always needs a main volume that can adjust volume of all channels in synchronously. In traditional multi-channel design mostly utilizing a multi-gang potentiometer, but it's so expensive and not easy to achieved well volume attenuation matching between each channel. Now a better solution is uses the PT2325 to replace the multi-gang potentiometer. The PT2325 is designed for multi-channel audio purpose, the chip has 6 groups built-in 48 steps volume attenuator for each channel and running in synchronous, it only needs an external DC voltage to setting volume attenuation. In general application, a cheap single-gang potentiometer is work well to control whole channel's volume. The DC volume setting also can be controlled by a PWM signal from the MCU and support 3.3V MCU bus voltage. The performance of the PT2325 is excellent for the high cost/performance multi-channel audio system, its wide attenuation range (down to -100dB), high channel separation characteristics is also suite for other high quality audio purpose. FEATURES * 6 channels, volume control range 0 ~ -100dB/per channel * Operating voltage range: 5 ~ 10V (Volume Buffer) 3.3 ~ 10V (Volume Controller) * Low noise, High SNR: Greater than 100dB (A-Weighted) * High channel separation > 100dB * Built-in MUTE function * DC controlled volume attenuation APPLICATIONS * * * * * AV surround system Car audio Mini combo PC multimedia speaker Other audio applications PT2325 V1.1 -1- August, 2007 Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw 6 Channel Volume Control PT2325 PIN CONFIGURATION 1 IN2 IN3 REF GNDA MUTE IN4 IN5 IN6 2 3 4 5 6 7 8 9 10 PT2325 20 19 18 17 16 15 14 13 12 11 OUT1 OUT2 OUT3 VCCV VOLUME GNDV FREQ_ADJ OUT4 OUT5 OUT6 PIN DESCRIPTION Pin Name IN1 IN2 IN3 VccA REF GNDA MUTE IN4 IN5 IN6 OUT6 OUT5 OUT4 Freq_ADJ GNDV VOLUME VccV OUT3 OUT2 OUT1 I/O I I I I I I I O O O I O O O Description Channel.1 input, AC coupling to audio source Channel.2 input, AC coupling to audio source Channel.3 input, AC coupling to audio source Power Supply for internal amplifier 1/2 VccA reference bypassing, connect a capacitor to ground Ground Pin for amplifier Mute pin. Connect to the VccA active the mute function Channel.4 input, AC coupling to audio source Channel.5 input, AC coupling to audio source Channel.6 input, AC coupling to audio source Channel.6 output, AC coupling to next stage Channel.5 output, AC coupling to next stage Channel.4 output, AC coupling to next stage Oscillator Frequency adjustment for the volume controller Ground Pin for the volume controller DC voltage input for the volume controller Power Supply input for the volume controller Channel.3 output, AC coupling to next stage Channel.2 output, AC coupling to next stage Channel.1 output, AC coupling to next stage Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 PT2325 V1.1 -2- August, 2007 Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw 6 Channel Volume Control PT2325 APPLICATION CIRCUIT Notes: 1. Cadj is for volume controller calibration purpose, the osc frequency is 1MHz when Cadj=100pF. 2. The DC block coupling capacitor (1F) placed in every input and output pin must care the polarity, the positive polarity side of cap must toward the higher potential for proper operation. If not may cause abnormal pop noise during volume is changed. PT2325 V1.1 -3- August, 2007 Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw 6 Channel Volume Control PT2325 ORDER INFORMATION Valid Part Number PT2325-D (L) Package Type 20 Pin, DIP, 300mil Top Code PT2325-D Notes: 1. (L), (C) or (S) = Lead Free. 2. The Lead Free mark is put in front of the date code. PT2325 V1.1 -4- August, 2007 |
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