MT3170B/71B, MT3270B/71B, MT3370B/71B

Data Sheet

10

Zarlink Semiconductor Inc.

‡ Typical figures are at 25

* Test Conditions

1. dBm refers to a reference power of 1 mW delivered into a 600 ohms load.

2. Data sequence consists of all DTMF digits.

3. Tone on = 40 ms, tone off = 40 ms.

4. Signal condition consists of nominal DTMF frequencies.

5. Both tones in composite signal have an equal amplitude.

6. Tone pair is deviated by

7. Bandwidth limited (0-3 kHz) Gaussian noise.

8. Precise dial tone frequencies are 350 Hz and 440 Hz (

9. Referenced to lowest level frequency component in DTMF signal.

10. Referenced to the minimum valid accept level.

11. Both tones must be within valid input signal range.

12. External guard time for MT3x70B = 20 ms.

13. Timing parameters are measured with 70pF load at SD output.

14. Time duration between PWDN pin changes from ‘1‘ to ‘0‘ and ESt/DStD becomes active.

15. Guaranteed by design and characterization. Not subject to production testing.

16. Value measured with an applied tone of 450 Hz.

18

Interdigit pause accept (DStD

logic output)

40

ms

MT3x71B

19

Interdigit pause reject (DStD

logic output)

20

ms

MT3x71B

20

Data shift rate 40-60% duty cycle

1.0

3.0

MHz

13,15

21

Propagation delay

(ACK to Data Bit)

100

140

ns

13,15

22

Data hold time (ACK to SD)

30

50

ns

13,15

stated.

Characteristics

Sym.

Min.

Max.

Units

Test Conditions*