AUX_SCLK
AUX_SDIN
AOUT1 +,-
AOUT2 +,-
AOUT3 +,-
AOUT4 +,-
AOUT5 +,-
AOUT6 +,-
AGND
VQ
VA
AIN1 +,-
AIN2 +,-
AIN3 +,-
AIN4 +,-
AIN5 +,-
AIN6 +,-
AIN5 A,B
AIN6 A,B
16
17
Auxiliary Serial Clock
(Output)
- Serial clock for the Auxiliary serial audio interface.
Auxiliary Serial Input
(Input) - The CS42438 provides an additional serial input for two’s comple-
ment serial audio data.
20,19
Differential Analog Output
(Output) - The full-scale differential analog output level is specified in
21,22 the Analog Characteristics specification table. Each positive leg of the differential outputs may also
24,23 be used single-ended.
25,26
28,27
29,30
35,48
Analog Ground
(Input) -
36
Quiescent Voltage
(Output)
-
Filter connection for internal quiescent reference voltage.
37,46
Analog Power
(Input) - Positive power supply for the analog section.
39,38
41,40
43,42
45,44
50,49
52,51
Differential Analog Input
(Input) - Signals are presented differentially to the delta-sigma modula-
tors. The full-scale input level is specified in the Analog Characteristics specification table. Single-
ended inputs may be applied to the positive terminals when the ADCx SINGLE pin is enabled.
Once in Single-Ended Mode, the negative terminal of AIN1-AIN4 must be externally driven to com-
mon mode. See below for a description of AIN5-AIN6 in Single-Ended Mode.
50,49
Single-Ended Analog Input
(Input) - In Single-Ended Mode, an internal analog mux allows selec-
52,51 tion between 2 channels for both analog inputs AIN5 and AIN6 (see section 7.6.6-7.6.8 for details).
The unused leg of each input is internally connected to common mode. The full-scale input level is
specified in the Analog Characteristics specification table.
47
Positive Voltage Reference
(Output) - Positive reference voltage for the internal sampling cir-
cuits.
FILT+
DS646PP2
9
CIRRUS [ CIRRUS LOGIC ]
