CDB4361
6. ANALOG OUTPUT FILTERING
The analog output on the CDB4361 has been designed according to the CS4361 datasheet. This output circuit in-
cludes an AC coupling cap and a single pole R and C. An additional load resistance may be added by shunting J23,
J24, J38, J39, J42, and J43 to test the CS4361’s load-driving capability. See
for more details.
7. OPTIONAL MUTE CIRCUITRY
The CDB4361 contains the optional, recommended mute circuitry for the CS4361. This circuitry is designed to min-
imize the potential for clicks and pops. In order for this circuitry to operate properly, a negative supply is required.
This supply is provided by U18. See
for more details.
CONNECTOR
+5 V
GND
S/PDIF INPUT - J1
S/PDIF INPUT - OPT1
PCM INPUT - J37
AOUT1 - 6
INPUT/OUTPUT
Input
Input
Input
Input
Input
Output
+ 5 V power
SIGNAL PRESENT
Ground connection from power supply
Digital audio interface input via coax
Digital audio interface input via optical
Input for master, serial, left/right clocks and serial data
RCA line level analog outputs
Table 1. System Connections
JUMPER /
SWITCH
J46
J17
J45
J20
PURPOSE
Selects source of voltage for
the CS4361 VA supply
Provides contact points to
measure VA current
Selects source of voltage for
the CS4361 VL supply
Provides contact points to
measure VL current
CS4361 Mode Select
POSITION
+3.3 V
*+5 V
-
+3.3 V
*+5 V
-
*I2S
LJ
RJ16
RJ24
*shunted
open
*shunted
open
shunted
*open
FUNCTION SELECTED
Voltage source is a +3.3 V regulator
Voltage source is +5 V binding post
Measure voltage across these nodes and divide result by 10 to
get current in amps
Voltage source is a +3.3 V regulator
Voltage source is +5 V binding post
Measure voltage across these nodes and divide result by 10 to
get current in Amps
Sets the mode of the CS4361 by placing a shunt across the
desired setting
Connects the CS4361 MUTEC pin to the mute circuitry
Disconnect for VA power-down current measurements
When shunted, the mute circuit is active
When open, the mute circuit is inactive
When shunted, a 3 kΩ AC load is added to the output
Leave open for normal operation
The CS8416 must be reset if switch S2 is changed
J52
J63
J53, J54
J55, J56
J57, J58
J24, J23
J39, J38
J43, J42
S1
S2
Global Mute Enable
Mute Enable
AC Load
Resets CS4361 and CS8416
SDIN Control
*All closed
All open
Connects SDIN1 to SDIN2 and SDIN3
SDIN1, 2, and 3 are discrete
DS672DB2
5
CIRRUS [ CIRRUS LOGIC ]
