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CMX808A

Family Radio Service CTCSS Processor

MX-COM Inc  

Family Radio Service CTCSS Processor

9

CMX808A Preliminary Information

4.1.2.3 AUDIO CONTROL Register (Hex address $82)

This register is used to control the functions of the device as described below:

Note: TX BPF ENABLE (Bit 7) and RX BPF ENABLE (Bit 6) should not be enabled at the same time.

TX BPF ENABLE

(Bit 7)

RX BPF ENABLE

(Bit 6)

BPF UN-MUTE

(Bit 5)

AUDIO ATTENUATION

(Bits 4, 3, 2, 1, and 0)

When this bit is "1" the audio band-pass filter is enabled and the output of the

filter is switched to TX AUDIO OUT. The output is then controlled by BPF UN-

MUTE. See Bit 5 below.

When this bit is “0” the audio band pass filter is disabled (powersaved) and the

output of the filter is disconnected from TX AUDIO OUT, which is then in a high

impedance state.

When this bit is “1” the audio band-pass filter is enabled and the output of the

filter is switched to RX AUDIO OUT. The output is then controlled by BPF UN-

MUTE. See Bit 5 below.

When this bit is “0” the audio band-pass filter is disabled (powersaved) and the

output of the filter is disconnected from RX AUDIO OUT, which is then in a high

impedance state.

When this bit is “1” and TX BPF ENABLE is “1” the audio band-pass filter output

is switched to the TX AUDIO OUT pin. When this bit is “0” the output of the

filter is disconnected from TX AUDIO OUT, which is then in a high impedance

state.

This control, along with TX BPF ENABLE, allows the filter to power up and

settle internally before switching the output on, when coming out of powersave.

When this bit is “1” and RX BPF ENABLE is “1” the audio band-pass filter output

is switched to the RX AUDIO OUT pin. When this bit is “0” the output of the

filter is disconnected from RX AUDIO OUT, which is then in a high impedance

state. This control, along with RX BPF ENABLE, allows the filter to power up

and settle internally before switching the output on, to avoid clicks when coming

out of powersave.

These five bits are used to set the attenuation of the audio volume control

according to Table 9.

Table 8: AUDIO CONTROL Register (Hex address $82)

Bits

Audio

4 3 2 1 0 Attenuation

00000

00001

Off (VBIAS)

48.0dB

00010

46.4dB

00011

44.8dB

00100

43.2dB

00101

41.6dB

00110

40.0dB

00111

38.4dB

01000

36.8dB

01001

35.2dB

01010

33.6dB

01011

32.0dB

01100

30.4dB

01101

28.8dB

01110

27.2dB

01111

25.6dB

©1999 MX-COM, Inc.

www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054

Doc. # 20480199.002

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA

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