Signal Conditioning ICs (like PGA308 from TI)

Discussion in 'General Electronics Chat' started by drvlas, Oct 16, 2015.

  1. drvlas

    Thread Starter New Member

    Oct 16, 2015
    26
    5
    Hi to all,

    I need a signal amplifier-conditioner for use with load cell bridges and half-bridges. Texas Instruments has PGA308, PGA309, PGA400 and PGA900 - and they are very good, it seems. Actually, the first suits me.
    But I'd like to have a broader look, since I'm a novice in the field. What do other manufactures propose? ADI, MAXIM, STM, who else...

    Thanks!
     
  2. drvlas

    Thread Starter New Member

    Oct 16, 2015
    26
    5
    Don't know how to edit my prev. post, so have to "replay"...
    I want to explain my task.
    I need a module to be used with strain gauge circuits. The bias and the gain have to be adjustable in a quite broad limits. Looking at the picture below we can say that we need a good (zero-drift) instrumental amplifier with adjustable gain K and a regulated bias V, added to the input voltage.
    Signal-conditioner.png

    On the old-fashioned boards the switches were used for step adjustment and potentiometers for fine trim. But one-chip conditioners are available now and I'd like to use them. PGA308 was the 1-st I've looked at. And decided to ask the AAC community if there are others.
    Since my 1-s post I've found an ADI analog: AD8557.
    So far the common issue with PGA308 and AD8557 is the absence of internal EEPROM. You have to load all settings every power cycle (so on-board MCU is the must) or you can program the OTP memory (once or 7 times) and that's all. I compare this with old boards: potentiometers which you could turn hundreds of times.
    The PGA900 has EEPROM, but it has an MCU (Cortex M0) too and costs too much.
    So I'm still in search...
     
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