CMX138 CML Microcircuits, CMX138 Datasheet - Page 7

• Manufacturer Part Number: CMX138
• Description: Audio Scrambler and Sub-Audio Signalling Processor
• Manufacturer: CML Microcircuits

Audio Scrambler and Sub-Audio Signalling Processor
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© 2008 CML Microsystems Plc
CMX138
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Signal List
COMMAND DATA
SERIAL CLOCK
SYS CLOCK 1
REPLY DATA
XTAL/CLOCK
AUXADC
AUXDAC
DISCN2
DISCN1
DISCFB
XTALN
TxENA
MICFB
AUDIO
Signal
Name
VDEC
IRQN
MICN
MICP
DVss
DV
MOD
AV
DV
V
AV
CSN
BIAS
DD
DD
SS
SS
TS OP
Type
PWR
PWR
PWR
PWR
PWR
PWR
OP
OP
OP
OP
OP
OP
OP
OP
OP
OP
IP
IP
IP
IP
IP
IP
IP
IP
IP
Digital Output pin – TxENA (active lo).
Internally generated 2.5V digital supply voltage. Must be decoupled to
DVss by capacitors mounted close to the device pins. No other
connections allowed.
Synthesised Digital System Clock Output 1.
C-BUS: A 'wire-ORable' output for connection to the Interrupt Request
input of the host. Pulled down to VSS(D) when active and is high
impedance when inactive. An external pull-up resistor is required.
C-BUS: A 3-state C-BUS serial data output to the µC. This output is high
impedance when not sending data to the µC.
C-BUS: The C-BUS serial clock input from the µC.
C-BUS: Serial data input from the µC.
C-BUS: The C-BUS chip select input from the µC - there is no internal pull-
up on this input.
The 3.3V positive supply rail for the digital on-chip circuits. This pin should
be decoupled to DV
Input to the oscillator inverter from the Xtal circuit or external clock source.
The output of the on-chip Xtal oscillator inverter.
Digital Ground.
Modulator output.
MIC input amplifier feedback.
MIC inverting input.
MIC non-inverting input.
Positive 3.3V supply rail for the analogue on-chip circuits. Levels and
thresholds within the device are proportional to this voltage. This pin
should be decoupled to AV
pins.
Auxiliary ADC input (inverted).
Internally generated bias voltage of about AV
is in ‘Powersave’ mode when V
decoupled to AV
other connections allowed.
DISC inverting input 2.
DISC inverting input 1.
DISC input amplifier feedback.
Audio output.
Analog Ground.
Auxiliary DAC output / RAMDAC.
Digital Ground.
Page 7
SS
by a capacitor mounted close to the device pins. No
SS
by capacitors mounted close to the device pins.
SS
by capacitors mounted close to the device
Description
BIAS
will discharge to AV
DD
/2, except when the device
SS
. Must be
D/138_FI1.0/5
CMX138