Dual channel PGA/VGA for audio

Robert Watkins1

Other Parts Discussed in Thread: PGA2310, PGA2311, PGA2320, PGA2310EVM

Greetings. I'm looking for a dual ch VCA for an audio project. All of the TI units are listed for Medical, Ultrasound or Sonar. Can any of these be used for an audio application? Thanx in advance

over 11 years ago

0 Ian Williams over 11 years ago

TI__Mastermind 27715 points

Hello Robert,

Have you considered the PGA2310, PGA2311, or PGA2320? They are all dual-channel PGAs designed for audio (specifically volume control) applications.

Best regards,

Ian Williams
Linear Applications Engineer
Precision Analog - Op Amps

0 Robert Watkins1 over 11 years ago in reply to Ian Williams

Prodigy 50 points

I have but I'm a novice and a little on the SDI and host controller setup and interface. I was planning on using rotory and slide potentiometers. If you could direct me to some info or literature on Host controllers and SDI I would greatly appreciate it.

0 Ian Williams over 11 years ago in reply to Robert Watkins1

TI__Mastermind 27715 points

There's a ton of information out there on SPI. Here are some useful links I was able to find:

This post discusses implementing SPI using an MSP430 microcontroller:

http://e2e.ti.com/support/microcontrollers/msp430/f/166/t/204442.aspx

If you like, I can also send you a PGA2310EVM for you to experiment with.

Best regards,

Ian Williams

0 Robert Watkins1 over 11 years ago in reply to Ian Williams

Prodigy 50 points

I will check these out. I appreciate all of your help. Thanx again.

0 Ian Williams over 11 years ago in reply to Robert Watkins1

TI__Mastermind 27715 points

Cheers!

- Ian Williams

0 Robert Cottiers over 11 years ago in reply to Ian Williams

Prodigy 60 points

Hi Ian: From a software perspective is there a way to write the desired volume level to just one channel without affecting the other channel?....it seems like you must write the level to both channels(2 byte write).

I am referring to the PGA2320 device.

thank you

Bob C.

0 Ian Williams over 11 years ago in reply to Robert Cottiers

TI__Mastermind 27715 points

Hello Bob,

You must write both channels during every SPI transaction, but each channel's value is set independently. In order to not affect one channel, simply write the same gain value as is currently programmed.

Best regards,

Ian Williams

Audio

Audio forum

Dual channel PGA/VGA for audio