CMX148 datasheet(71/75 Pages) CMLMICRO

71 / 75 page

PMR Audio and Data Processor

CMX148

D/148/6

AC Parameters (cont.)

Notes

Min.

Typ.

Max.

Unit

DTMF Decoder

Sensitivity

–

−22

Response Time

–

De-response Time

–

Falsing Rate (per 30min Voice input)

–

Frequency Tolerance

–

±2.5

–

Twist

−10

–

+10

Audio Compandor

Attack Time

–

4.0

–

Decay Time

–

0dB Point

–

100

–

mVrms

Compression/Expansion Ratio

–

2:1

–

DTMF Encoder

Output Signal Level

84,85

–

775

–

mVrms

Output Level Variation

Output Distortion

–

MSK/FFSK Encoder

Output Signal Level

–

775

–

mVrms

Output Level Variation

−1.0

+1.0

Output Distortion

–

rd Harmonic Distortion

–

Logic 1

frequency

1200baud and

2400baud

1198

1200

1202

Logic 0

frequency

1200baud

1798

1800

1802

2400baud

2398

2400

2402

Isochronous Distortion (0 to 1 and 1 to 0)

–

µs

Notes:

AVDD = 3.3V.

Measured in single tone mode, P1.0 set to $DAA0.

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