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CS5126-KL Datasheet(PDF) 6 Page - Cirrus Logic

No. de pieza CS5126-KL
Descripción Electrónicos  16-Bit Stereo A/D Converter for Digital Audio
Download  32 Pages
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Fabricante Electrónico  CIRRUS [Cirrus Logic]
Página de inicio  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

CS5126-KL Datasheet(HTML) 6 Page - Cirrus Logic

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System Initialization
Upon power up, the CS5126 must be reset to
guarantee a consistent starting condition and in-
itially calibrate the device. Due to the CS5126’s
low power dissipation and low temperature drift,
no warm-up time is required before reset to ac-
commodate any self-heating effects. However,
the voltage reference input should have stabi-
lized to within 0.25% of its final value before
RST rises to guarantee an accurate calibration.
Later, the CS5126 may be reset at any time to
initiate a single full calibration. Reset overrides
all other functions. If reset, the CS5126 will
clear and initiate a new calibration cycle mid-
conversion or midcalibration.
When RST is brought low all internal logic
clears. When it returns high a calibration cycle
begins which takes 34,584,480 master clock cy-
cles to complete (approximately 1.4 seconds
with a standard 24MHz master clock). The
CS5126’s STBY output remains low throughout
the calibration sequence, and a rising transition
indicates the device is ready for normal opera-
tion.
A simple power-on reset circuit can be built us-
ing a resistor and capacitor as shown in Fig-
ure 1. The RC time constant must be long
enough to guarantee the rest of the system is
fully powered up and stable by the end of reset.
Master Clock
The CS5126 operates from an externally-sup-
plied master clock. In stereo operation, the mas-
ter clock frequency is set at 512 times the per-
channel sampling rate (256 in 2X oversampling
schemes). The CS5126 can accept master clocks
up to 24.576 MHz for 48kHz stereo sampling or
96kHz monaural oversampling.
All timing and control inputs for channel selec-
tion, sampling, and serial data transmission may
be divided down from the master clock. This
yields a completely synchronous system, avoid-
ing sampling and conversion errors due to asyn-
chronous digital noise.
CIRCUIT CONNECTIONS
Stereo Operation
Figure 2 shows the standard circuit connections
for operating the CS5126 in its stereo mode. The
HOLD, L/R, and SCLK inputs are derived from
the master clock using a binary divider string. A
24.576 MHz master clock is required for a sam-
pling rate of 48kHz per channel.
For 48kHz stereo sampling, the CS5126 must
sample and convert at a 96kHz rate to handle
both channels. The master clock is divided by
256 and applied to the HOLD input. A falling
transition on the HOLD pin places the input in
the hold mode and initiates a conversion cycle.
The HOLD input is latched internally by the
master clock, so it can return high anytime after
one master clock cycle plus 50ns.
In stereo operation the CS5126 alternately sam-
ples and converts the left and right input chan-
nels. This alternating channel selection is
achieved by dividing the HOLD input by two
(that is, dividing the master clock by 512) and
applying it to the L/R input. Upon completion of
each conversion cycle, the CS5126 automatically
returns to the track mode. The status of L/R as
CS5126
+5V
RST
R
C
Figure 1. Power-On Reset Circuit
CS5126
6
DS32F1


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