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Old 11th May 2011, 12:01 PM   #1
usul27 is offline usul27  Switzerland
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Default INA 103 and digital potentiometer

Has anyone paired an INA 103/263 or similar with a digital potentiometer to adjust the gain? Thinking about this combination for a RIAA stage to adjust the gain.

Found this from AD: Circuit Note | CN0114 | Low Cost, High Voltage, Programmable Gain Instrumentation Amplifier Using the AD5292 Digital Potentiometer and the AD8221 In-Amp | Analog Devices

Any experiences or opinions?
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Old 11th May 2011, 05:29 PM   #2
kevinkr is offline kevinkr  United States
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I've used them in the front ends of ATE instrumentation for calibration, but have not listened to them.
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Old 12th May 2011, 03:50 AM   #3
Bonsai is offline Bonsai  Taiwan
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If you are looking for balanced input with adjustable gain, another (easier) approach is to simply use a PGA2320. It has two channels, use one for hot, one for cold and it has built in 255 step gain control (SPI). I am doing this on my latest pre-amp design. Works very well indeed. Have a look at my website for some pictures.
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Old 12th May 2011, 06:05 AM   #4
usul27 is offline usul27  Switzerland
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I had a look at the specs. I forgot to say that I want to use the INA 103 as input stage for MM and MC.
Seems, that the PGA2320 is not suitable for this application (performance best on 3V signal input, input impedance <600 Ohm). This would need at least additional preamplification and buffering.
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Old 12th May 2011, 09:50 AM   #5
Bonsai is offline Bonsai  Taiwan
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You are correct - the PGA2320 is designed for line level applications. If you are looking for MM or MC input levels, then indeed you need something else.
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