RALCWI Vocoder
CMX608/CMX618/CMX638
PCM3500
This CODEC should be supplied with a 4096MHz clock, giving a sample rate of 8ksample/s. The
connections for this device are shown below and in Figure 15:
PCM3500
Pin
CMX608/CMX618/CMX638
Name
Vcom
Vref1
Vref2
Vin
Pin
Name
1
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Pull high - Master mode
Pull high - Time slot mode
Connect to
2
3
4
5
AGND
M/S
6
7
TSC
8
BCK
17
18
16
15
SCLK
STRB
SDO
SDI
9
FS
Connect to
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
DIN
Connect to
DOUT
FSO
Connect to
Leave Unconnected
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Connect to
Vdd
DGND
SCKIO
XTO
XTI
HPFD
LOOP
PDWN
AGND
Vout
20
REC
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AGND
Vcc
The PCM3500 is started using the following sequence of instructions:
.
Select the external CODEC type - PCM3500.
Write $45 (CODEC_PCM3500) into the EXCODECCONT register ($0B) and then wait for
the RDY bit to be set in the STATUS register ($40). If C-BUS interrupts are enabled for
the RDY bit, then IRQN will go low as well - this applies to the rest of the sequence.
.
Ensure that the CODEC is in its power-save/reset mode, the CODEC port (SSP) is
disabled and the CODEC command FIFO is empty.
2014 CML Microsystems Plc
24
D/608_18_38/11
CMLMICRO [ CML MICROCIRCUITS ]
