CS4361 Datasheet, PDF (18/23 Pages) Cirrus Logic – 20-pin, 24-bit, 192 kHz, 6-channel D/A Converter

CS4361
4.9 Mute Control
The MUTEC pin is intended to be used as control for an external mute circuit in order to add off-chip mute capability.
This pin becomes active under the following conditions.
1) during power-up initialization
2) upon reset
3) if the MCLK to LRCK ratio is incorrect
4) upon receipt of 8192 consecutive samples of zero
5) during power-down.
The MUTEC pin will only go active on static zero data only if all 6 channels satisfy the 8192 sample requirement. If
any channel receives non-zero data then the mute pin will return low (inactive).
Use of the mute control function is not mandatory but is recommended for designs requiring the absolute minimum
in extraneous clicks and pops. Also, use of the mute control function can enable the system designer to achieve idle
channel noise & signal-to-noise ratios which are only limited by the external mute circuit. The MUTEC pin is an ac-
tive-high CMOS driver. See Figure 13 below for a suggested active-high mute circuit.
AOUT
AC
Couple
6
470 Ω
10 kΩ
Filter
Cap
C S4361
MUTE C
+V_A
MMU N 2111LT 1
MMU N 2211LT 1
10 kΩ
2 kΩ
6
(Low R _on)
-V (if a va ila ble )
Figure 13. Suggested Active-low Mute Circuit
A u d io
O ut
47 kΩ
18
DS672A2