Cirrus Logic CS1601 - Manual

Copyright  Cirrus Logic, Inc. 2011
(All Rights Reserved)
Cirrus Logic, Inc.
http://www.cirrus.com
CS1501 & CS1601: Frequently Asked Questions
DS927FAQ1
SEP’11
CONTACTING CIRRUS LOGIC SUPPORT
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visit the Cirrus Logic website at http://www.cirrus.com .
Question 1: What is the variance in the link voltage due to the reference current?
The reference current is specified as 129 A at 25°C.
The reference current is defined by the internal DAC current (I
dac
). Production calibration is carried out, and
the reference can be considered accurate for design purposes.
Matrix lot variation testing showed the following part-to-part variation at room temperature:
Max = +0.51%; Min = -0.61%
Question 2: What is the reference current variation over temperature?
Over the entire temperature range of -40°C to 125°C, the total variation of I
ref
is 120 A to136A, with the
major swings occurring at the extremes of temperature.
Over the more normal temperature range of 0°C to +70°C, the variation is limited to -1.0% to +1.5%.
Typical variations for V
link
are shown below:
I
ref
(I
dac
) Variation over Temperature
Temperature (°C) Max(%) Mean(%) Min(%)
5 -0.17 -0.50 -1.00
25 +0.00 +0.00 +0.00
55 +1.25 +0.35 -0.07
85 +1.50 +0.24 -0.56
375
380
385
390
395
400
405
-5 5 15 25 35 45 55 65 75
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