CMX639E2 Ver la hoja de datos (PDF) - CML Microsystems Plc
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CMX639E2 Datasheet PDF : 16 Pages
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CVSD Codec
Dynamic Values
Encoder:
Analog Signal Input Levels
VDD = 3.0V
VDD = 5.0V
Principal Integrator Frequency
Encoder Passband
Compand Time Constant
Decoder:
Analog Signal Output Levels
VDD = 3.0V
VDD = 5.0V
Decoder Passband
Encoder Decoder (Full Codec):
Passband
Stopband
Stopband Attenuation
Passband Gain
Passband Ripple
Output Noise (Input Short Circuit)
Perfect Idle Channel Noise
(Encode Forced)
Group Delay Distortion
(1000Hz - 2600Hz)
(600Hz - 2800Hz)
(500Hz - 3000Hz)
Xtal/Clock Frequency
Notes
Min.
Typ.
Max.
CMX639
Units
7
-37
6
dB
7
-33
10
dB
160
Hz
4
3240
Hz
5
ms
7
-37
7
-33
4
3200
4
300
6
60
0
-3.0
8
-60
8, 9
-63
5
10, 11
0.500
1.024
6
10
3400
10
3.0
450
750
1500
2.048
dB
dB
Hz
Hz
kHz
dB
dB
dB
dBm0p
dBm0p
µs
µs
µs
MHz
Notes:
1. All logic inputs except Encoder and Decoder Data clocks.
2. The source impedance driving the coupling capacitor should be less than 1kΩ. A lower driving source
impedance will reduce encoder output channel noise levels.
3. For an Encoder/Decoder combination.
4. See Figure 5.
5. Group Delay Distortion for the full codec is relative to the delay with an 820Hz, -20dB signal at the encoder
input.
6. Not including any current drawn from the device pins by external circuits.
7. Recommended values.
8. dBm0p units are measured after the application of a psophometrically weighted filter that is commonly
applied in voice communication applications per CCITT Recommendation G.223.
9. Forced idle encode/decode control not available on D4 (16-pin SOIC) package.
10. Some applications may benefit from the use of an Xtal/Clock frequency other than 1.024MHz.
Note: Codec time constants and filter response curves are effectively proportional to Xtal/Clock frequency
© 2000 Consumer Microcircuits Limited
10
CMX639/2
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