CMX882 데이터 시트보기 (PDF) - CML Microsystems Plc
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CMX882 Datasheet PDF : 70 Pages
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FRS Signalling Processor
CMX882
1.4 External Components
VDD(D)
R1
C-BUS
Interface
Discriminator
C8
R5
NC
NC
IRQN
REPLY_DATA
VSS(D)
SERIAL_CLOCK
CMD_DATA
CSN
VSS(A)
C5
VBIAS
DISC
DISC_FB
R6
INPUT_2
INPUT_2_FB
Microphone
1
28
2
27
3
26
4
25
5
24
6 CMX882 23
7
22
8
21
9
20
10
19
11
18
12
17
13
16
14
15
C6
R7
NC
NC
VSS(D)
CLOCK_OUT
CLOCK/XTAL
VDD(D)
AUDIO
VSS(A)
MOD_2
MOD_1
VDD(A)
SIG_MONITOR
MIC_FB
MIC
C7
R8
X1
VSS(D)
C2
R2
Loudspeaker amp
R3
R4
C1
Modulator reference
Modulator control
C3 C4
VSS(A)
C9*
D1* R10*
R9*
VSS(A)
C10*
Figure 2 Recommended External Components
R1 100kΩ
R2 100kΩ
R3 100kΩ
R4 100kΩ
R5 See note 2
R6 100kΩ
R7 See note 3
R8 100kΩ
R9 See note 6
R10 See note 6
C1 100pF
C2 1nF
C3 100pF
C4 100pF
C5 100pF
C6
C7
C8
C9/10
See note 4
200pF
See note 4
See note 6
X1 18.432MHz
D1 See note 6
See note 1
Resistors ±5%, capacitors and inductors ±20% unless otherwise stated.
Notes:
1. X1 can be a crystal or an external clock generator; this will depend on the application. The clock
drift requirement is defined in section 1.8.1. The tracks between the crystal and pin 24 and pin 5
should be as short as possible to achieve maximum stability and best start up performance.
2. R5 should be selected to provide the desired dc gain (assuming C8 is not present) of the
discriminator input, as follows:
GAINDisc = 100kΩ / R5
The gain should be such that the resultant output at the DISC_FB pin is within the discriminator input
signal range specified in section 1.8.1.
3. R7 should be selected to provide the desired dc gain (assuming C6 is not present) of the microphone
input as follows:
GAINMic = 100kΩ / R7
The gain should be such that the resultant output at the MIC_FB pin is within the microphone input
signal range specified in section 1.8.1.
4. C6 and C8 should be selected to maintain the lower frequency roll-off of the microphone and
discriminator inputs as follows:
C6 = 30nF × GAINMic
C8 = 100nF × GAINDisc
and C6 > 1000µF / R7
and C8 > TBAµF / R5
2004 CML Microsystems Plc
11
D/882/7
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