CMX469AE2 CML Microcircuits, CMX469AE2 Datasheet - Page 11

• Manufacturer Part Number: CMX469AE2
• Description: 1200/2400/4800 Baud FFSK Modem
• Manufacturer: CML Microcircuits

1200/2400/4800 Baud FFSK/MSK Modem
Notes:
Carrier Detect
Sensitivity
Probabilty of CD being High after bit 16:
Transmitter Output
Tx Output Level
Output Level Variation for 1200/1800Hz
or 1200/2400Hz or 2400/4800Hz
Output Distortion
3rd Harmonic Distortion
Isochronous Distortion
Logic ‘1’ Carrier Frequency 1200 Baud
Logic ‘0’ Carrier Frequency 1200 Baud
2001 Consumer Microcircuits Limited
with SNR = 12dB
with 230mVrms Noise and No Signal
1200Hz - 1800Hz/1800Hz - 1200Hz
1200Hz - 2400Hz/2400Hz - 1200Hz
2400Hz - 4800Hz/4800Hz - 2400Hz
1. Measured at V
2. Excludes any current drawn by external components, but includes current drawn by the crystal
3. See Figure 6 (Typical Variation of BER with Input Signal Level).
4. SNR = Signal-to-Noise Ratio in the Bit-Rate Bandwidth.
5. See Figure 7 (Typical Rx BER vs Signal-to-Noise Ratio).
6. Dependent upon Xtal tolerance.
7. With an alternating (1010...) pattern.
8. Measured with a 150mVrms input signal (no noise).
9. A signal level of 230mVrms is used in C.D. probability measurements. Noise bandwidth is 5kHz
10. For an unmodulated carrier.
components.
(1200/2400 baud operation) or 8kHz (4800 baud operation). See Section 1.4, Note 2 for details
on optimising noise immunity.
2400 Baud
4800 Baud
2400 Baud
4800 Baud
DD
= 5.0 volts. Signal levels and thresholds are proportional to V
12
Notes
1, 7, 8
10
10
3
9
9
1
6
6
6
6
6
6
Min.
0
-
-
-
-
-
-
-
-
-
-
-
-
-
0.995
1200
1200
2400
1800
2400
4800
Typ.
0.05
25.0
20.0
10.0
775
3.0
2.0
-
-
+/-1.0
Max.
40.0
30.0
20.0
150
5.0
3.0
-
-
-
-
-
-
-
DD.
mVrms
mVrms
Units
CMX469A
dB
Hz
Hz
Hz
Hz
Hz
Hz
µs
µs
µs
%
%
D/469A/2