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Old 25th June 2008, 02:19 PM   #1
regal is offline regal  United States
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Default CS4397 or WM8471 can drive what impedance load?

Would a CS4397 or WM8471 be OK driving an analog stage under 10k Ohms? It looks like CS is specififying into a 1kOhm load, does that sound right? WM callsout a 10kOhm load, I am not sure what they can drive.
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Old 25th June 2008, 04:23 PM   #2
kevinkr is offline kevinkr  United States
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Default Re: CS4397 or WM8471 can drive what impedance load?

Quote:
Originally posted by regal
Would a CS4397 or WM8471 be OK driving an analog stage under 10k Ohms? It looks like CS is specififying into a 1kOhm load, does that sound right? WM callsout a 10kOhm load, I am not sure what they can drive.

I think you just answered your own question...
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Old 25th June 2008, 05:14 PM   #3
regal is offline regal  United States
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So minimum CS4397 is 1 k Ohms.

Minimum WM8471 is 10 kOhms ?
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Old 25th June 2008, 06:41 PM   #4
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Quote:
Originally posted by regal
So minimum CS4397 is 1 k Ohms.

Minimum WM8471 is 10 kOhms ?
The WM8741 can handle 2k to midrail, or twice that to ground. All measurements in the datasheet is specified into 10k however, and it would be best not to go below this.
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Old 26th June 2008, 05:38 AM   #5
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According to an application note I found at CS the dynamic range is 5dB higher if loaded by 1k instead of 10k. As this must be for each output, the differential load must not be lower than 2k. Anyway I would sacrifice a few dBs dynamic range for lighter loading and go for 4-5k differential load (and use a 1:1 transformer with primary termination for balanced to unbalanced).
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