Rainbow Electronics DS2132A_Q - Manual (Page 13)

DS2132A/Q
041295 13/17
DTMF RECEIVER CHARACTERISTICS (0 ° C to 70 ° C; V
CC
= 5V + 10%)
PARAMETER SYMBOL MIN TYP MAX UNITS NOTES
Valid Detect Amplitude Range -40 0 dBm0 1,2
Frequency Deviation Accept + 1.5 % 3
Frequency Deviation Reject +3.5 % 3
Minimum Twist Accept Range -10 +10 dB 4
Talk Off (Mitel Tape CM7291) 5 Hits 5
Noise Tolerance (Mitel Test Tape
CM7291) -12 dB 6
NOTES:
1. 0 dBm0 = 1.231Vrms when sent through a Hitachi HD44238P CODEC as shown in Figure 1.
2. Individual tone level of the DTMF pair with recording path gain set to 0db.
3. Percent of nominal frequency for the individual tone; FS = 8 KHz (+0.1%).
4. Twist = 20 LOG (High tone/Low tone).
5. Talk Off is a measure of the speech immunity of a DTMF receiver; the lower the number of hits, the better the
immunity.
6. Three KHz bandlimited white noise, referenced to lowest amplitude in the DTMF pair.
DTMF DETECTION TIMING (0
°
C to 70
°
C; V
CC
= 5V + 10%)
PARAMETER SYMBOL MIN TYP MAX UNITS NOTES
Tone Duration Accept 40 ms
Tone Duration Reject 20 ms
Interdigit Pause Accept 40 ms
Interdigit Pause Reject 20 ms
DTMF TONE GENERATOR CHARACTERISTICS (0
°
C to 70
°
C; V
CC
= 5V + 10%)
PARAMETER SYMBOL MIN TYP MAX UNITS NOTES
DTMF Frequency Deviation (each
tone of the pair) +1.0 % 1
Output Distortion (single tone) -25 dB 2
DTMF Tone Level Twist +3 dB 3
NOTES:
1. FS = 8.0 KHz + 0.1%
2. Total harmonic distortion relative to test tone signal.
3. Twist = 20 LOG (High tone/Low tone).