CS4270 Cirrus Logic, CS4270 Datasheet - Page 29

• Manufacturer Part Number: CS4270
• Description: 192 kHz Stereo Audio CODEC
• Manufacturer: Cirrus Logic

DS686A1
5.4.2 Output Connections
5.5
Mute Control
The analog output filter present in the CS4270 is a switched-capacitor filter followed by a continuous time
low pass filter. Its response, combined with that of the digital interpolator, is given in Figures
42. The recommended external analog circuitry is shown in
The Mute Control pins become active during power-up initialization, reset, muting, when the MCLK to
LRCK ratio is incorrect, and during power-down. The MUTE pins are intended to be used as control for
an external mute circuit in order to add off-chip mute capability.
The CS4270 also features Auto-Mute, which is enabled by default. The Auto-Mute function causes the
MUTE pin corresponding to an individual channel to activate following the reception of 8192 consecutive
static-level audio samples on the respective channel. A single transition of data on the channel will cause
the corresponding MUTE pin to deactivate.
Use of the Mute Control function is not mandatory but recommended for designs requiring the absolute
minimum in extraneous clicks and pops. Also, use of the Mute Control function can enable the system
CS4270
Analog
Input
AOUTx
Figure 13. CS5344 Example Analog Input Network
Figure 14. CS4270 Recommended Analog Output Filter
+
47 Ω
3.3 µF
C =
4 πF s ( R
R
10kΩ
ext
+ 470
ext
470 )
9.76 kΩ
470Ω
10 µF
For best 20 kHz response
Figure
2200 pF
C
14.
Analog Output
AINx
CS4270
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R
ext
Figures 19
CS4270
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