MX105ADW CMLMICRO [CML Microcircuits], MX105ADW Datasheet - Page 8

• Manufacturer Part Number: MX105ADW
• Description: Tone Detector
• Manufacturer: CMLMICRO [CML Microcircuits]

Tone Detector
5.5 Select R4 for Operating BW
The exact bandwidth given by any value of R4 will vary slightly. In applications where an exact bandwidth is required, R4
should be a variable resistor to permit adjustment.
5.6 Calculate R2 C2
For a frequency of 2800 Hz, a bandwidth of 6%, and a choice of C2
Note: Use nearest preferred values.
5.7 Define Maximum Allowed Response Time
The maximum response time (T
The MX105A’s T
gives the best S/N performance.
Using the formula above, for a frequency of 2800 Hz and a bandwidth of 6% the approximate Lock time (T
ms. Since the maximum response time is 50 ms, a DETECT time of 41 ms is allowed.
Note: T
This is used in calculating T
5.8 Calculate R3 C3
Note:
1. For a signal amplitude of 200 mV
2. Use nearest preferred values.
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4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
A. Calculate T
B. Calculate Maximum Allowable T
C. Define Minimum Expected Signal Amplitude V
a T
DETECT
LOCK
may vary from near zero to the value given, causing corresponding variations in actual T
time of 20ms. This in turn yields a response time of 9ms + 20 ms = 29ms.
LOCK
ON
must not exceed the maximum time allowed for the application, but a value lying near the maximum
A
A
DETECT
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ON
) is the sum of the VCO lock time (T
components.
DETECT
RMS
where: V
, a resistor value R3 of 510 k
R4
R3 C3
10.35 BW
T
4.8 BW
R2 C2
DETECT
TH
IN
T
is the detect filter sensitivity.
LOCK
MIN
A
8
A
T
3 ln 1
ON
3 f
f
10.35 6
0
T
MAX
4.8 6
DETECT
150
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100
0
BW
T
A
V
LOCK
BW
V
IN
LOCK
TH
MIN
0.01 F
with a 0.1 F capacitor for C3
6.8k
) and the DETECT integration time (T
R
V
200k
MX105A PRELIMINARY INFORMATION
.
A
ON
and C3
.
Doc.# 20480133.003
LOCK
B
) will be 9
will yield
DETECT
).