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[on:]

I'm looking for an ADC with a mininum of:
12 channels or two 8 channels
12-bit resolution
SPI communication, I2C may do; however, I'm already using SPI for the data logger.
Capable of reading 5V
Speed is not very important
DIP preferred but not a big deal

Have you used something along these lines? What would you recommend?

[Reply #1 on:]

Yes I have - in fact just designed an  8-channel SPI ADC onto a PIC based board so it could have Analog in like an ATMega.
Will look up the part number when I get home in few hours.

[Reply #2 on:]

It's only 8 channels, but 16 bit (14 at high speeds) Max1168...QSOP package, but you can get a dip converter. I've just started hooking one up and started talking to it last night.

[Reply #3 on:]

Analog Devices asks: "Why do more engineers choose ADI data converters over the next 8 suppliers combined?"

'Cause they make great parts like this!
http://www.analog.com/static/imported-files/data_sheets/AD5590.pdf

Flexible serial interface SPI-/QSPI-/MICROWIRE-/DSP-compatible

Input Channels
12-bit successive approximation ADC
16 inputs with sequencer
Fast throughput rate: 1 MSPS
Wide input bandwidth: 70 dB SNR at fIN = 50 kHz

and! :

Output channels
16 outputs with 12-bit DACs
On-chip 2.5 V reference
Hardware LDAC and LDAC override function
Rail-to-rail operation

[Reply #4 on:]

Thank you.
Interesting, I came across a MAXIM MAX1238 Evaluation Kit 12bit 12 Channel ADC yesterday on eBay and I purchased it.
I will be testing it and see how it works, the nice thing is that th evaluation board has built in resistors and capacitors, it looks like a low pass filter at each input, which will help me with a problem I'm having with too much electric noise in the readings I'm taking.