Rainbow Electronics DS2130Q - Manual (Page 16)

DS2130Q
041295 16/22
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 Test Tape #CM7291) 5 Hits 5
Noise Tolerance
(Mitel Test Tape #CM7291) -12 dB 6
NOTES:
1. All DTMF receiver tests performed using test circuit shown in Figure 12.
2. Individual tone level of the DTMF pair.
3. Percent of nominal frequency for the individual tone.
4. Twist = 20 LOG (Hi tone/Lo 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 tone in the DTMF pair.
DTMF RECEIVER TIMING (0
°
C to 70
°
C; V
CC
= +5V + 10%)
PARAMETER SYMBOL MIN TYP MAX UNITS NOTES
Tone Duration Accept t
TAC
40 ms 1
Tone Duration Reject t
TRJ
20 ms
Interdigit Pause Accept t
PAC
40 ms
Interdigit Pause Reject t
PRJ
20 ms
Detect Delay (DT0-3) t
DTD
25 45 ms
NOTE:
1. See Figure 13 for DTMF receiver timing diagrams.
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, 2
DTMF High Tone Level -6.0 dBm0
DTMF Low Tone Level -6.0 dBm0
Output Twist (DTMF only) 0.0 dB
1004 Hz Tone Level 0.0 dBm0
620, 350 Hz Tone Level -12.0 dBm0
Output Distortion (single tone) -25 dB 3
NOTES:
1. All tests performed using test circuit in Figure 12. Zero dBm0 = 1.231 Vrms with the Hitachi HD44238 codec/fil-
ter device.
2. PCMFS = CPXFS = 8.0 KHz + 0.1%.
3. Total harmonic distortion relative to test tone signal.