MT8889CN Zarlink Semiconductor, Inc., MT8889CN Datasheet - Page 22

• Manufacturer Part Number: MT8889CN
• Description: Integrated DTMF Transceiver with Adaptive Micro Interface
• Manufacturer: Zarlink Semiconductor, Inc.

AC Electrical Characteristics
- Voltages are with respect to ground (V
† Characteristics are over recommended operating conditions unless otherwise stated
‡ Typical figures are at 25 C, V
NOTES:
1.
2.
3.
4.
5.
6.
7.
8.
9.
10. Referenced to the lowest amplitude tone in the DTMF signal.
11. For guard time calculation purposes.
16
17
dBm=decibels above or below a reference power of 1 mW into a 600 ohm load.
Tone duration=40 ms. Tone pause=40 ms.
Nominal DTMF frequencies are used.
Both tones in the composite signal have an equal amplitude.
The tone pair is deviated by
Bandwidth limited (3 kHz) Gaussian noise.
The precise dial tone frequencies are 350 and 440 Hz ( 2 %).
Guaranteed by design and characterization. Not subject to production testing.
Digit sequence consists of all 16 DTMF tones.
Output Capacitance (IRQ/CP)
Input Capacitance (data bus)
DS/RD/WR
Characteristics
DD
=5V, and for design aid only: not guaranteed and not subject to production testing
1.5 % 2 Hz.
†
SS
- MPU Interface (continued)
), unless otherwise stated.
Figure 18 - DS/RD/WR Clock Pulse
Zarlink Semiconductor Inc.
t
R
C
Sym
C
OUT
MT8889C
IN
22
t
CH
Min
t
CYC
Typ
t
F
5
5
‡
Max
t
CL
Units
pF
pF
Conditions
Data Sheet