1.5 Terminal Functions (continued)
TERMINAL
NO.
I/O
DESCRIPTION
NAME
GQE/
ZQE
PW
RHD
SCLK
15
14
6
24
21
I
I
I
Control-port serial-data clock. For SPI and 2-wire control modes this is the serial-clock input.
See Section 3.1 for details.
SDIN
VMID
23
20
Control-port serial-data input. For SPI and 2-wire control modes this is the serial-data input and
also is used to select the control protocol after reset. See Section 3.1 for details.
16
13
Midrail voltage decoupling input. 10-µF and 0.1-µF capacitors should be connected in parallel to
this terminal for noise filtering. Voltage level is 1/2 AVDD nominal.
XTI/MCLK
XTO
16
18
25
26
22
23
I
Crystal or external-clock input. Used for derivation of all internal clocks on the AIC23B.
O
Crystal output. Connect to external crystal for applications where the AIC23B is the audio timing
master. Not used in applications where external clock source is used.
1−6
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