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CS5126 数据表(PDF) 11 Page - Cirrus Logic

部件名 CS5126
功能描述  16-Bit Stereo A/D Converter for Digital Audio
Download  32 Pages
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制造商  CIRRUS [Cirrus Logic]
网页  http://www.cirrus.com
标志 CIRRUS - Cirrus Logic

CS5126 数据表(HTML) 11 Page - Cirrus Logic

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larly, the acquisition time for the external sam-
ple/hold amplifiers must not exceed the mini-
mum conversion time of 192 master clock cycles
(7.8
µs for 48kHz stereo sampling).
Oversampling
The CS5126 can alternatively be used to over-
sample one channel (monaural) by 2X simply by
tying the L/R input high or low. This moves
much of the anti-alias burden from analog filters
to digital post-filtering. The analog filters’ cor-
ner can be pushed out in frequency with lower
roll-off, allowing lower passband ripple and
more linear phase in the audioband. Digital FIR
filtering, meanwhile, can be used to implement
high roll-off filters with ultra-low passband rip-
ple and perfectly linear phase.
Oversampling not only improves system-level
filtering performance, but it also enhances the
ADC’s dynamic range and distortion charac-
teristics. All noise energy in a sampled, digital
signal aliases into the baseband between dc and
one-half the sampling rate. For an ideal succes-
sive-approximation ADC the noise spectral con-
tent is white. Therefore, in a 2X oversampling
scheme such as 96kHz sampling the ADC’s
noise will be be spread uniformly from dc to
48kHz. Digital post-filtering then rejects noise
outside of the 20kHz or 22kHz bandwidth, re-
sulting in improved signal-to-noise and dynamic
range. For a white noise spectrum, a 2X reduc-
tion in bandwidth yields a 3dB improvement in
dynamic range.
Due to its on-chip self-calibration scheme, the
CS5126’s dynamic range is limited only by
white broadband noise rather than signal-depend-
ent DNL errors. Therefore, the CS5126 picks up
a full 3dB improvement in dynamic range to
95dB when implemented in 2X oversampling
schemes.
Oversampling and digital filtering also enhance
the ADC’s distortion performance. Consider for
example a full-scale 15kHz input signal to the
CS5126 sampling at 96kHz. Sampling distortion
produces THD of approximately 0.005% (86dB)
at the converter’s output. Most of the distortion
energy resides in the second and third harmonics
VA-
VD-
AINL*
AINR
VREF
AGND
REFBUF
+5V*
SCLK
CLKIN
SDATA
DGND
HOLD
+5V
-5V
Voltage
Reference
0.1
µF
0.1
µF
f
/256
clk
f
/16
clk
fclk
10
Anti Alias
Filter
Analog
Input
+ 1
µF
+
1
µF
+ 1
µF
+
1
µF
1nF
10
200
CS5126
* AINR can alternatively be used
with L/R grounded
SLEEP
VD+
VA+
L/R
0.1
µF
0.1
µF
0.1
µF
Figure 9. Monaural 2X Oversampling Connections
CS5126
DS32F1
11


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