參數(shù)資料
型號: MT8888C
廠商: Zarlink Semiconductor Inc.
英文描述: Integrated DTMF Transceiver with Intel Micro Interface
中文描述: 集成雙音多頻收發(fā)器與英特爾微型接口
文件頁數(shù): 21/25頁
文件大?。?/td> 536K
代理商: MT8888C
MT8888C
Data Sheet
21
Zarlink Semiconductor Inc.
Characteristics are over recommended operating conditions unless otherwise stated
Typical figures are at 25
°
C, V
DD
=5 V, and for design aid only: not guaranteed and not subject to production testing
Notes:
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
dBm=decibels above or below a reference power of 1 mW into a 600 ohm load.
Digit sequence consists of all 16 DTMF tones.
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
±
1.5%
±
2 Hz.
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.
Referenced to the lowest amplitude tone in the DTMF signal.
For guard time calculation purposes.
Figure 18 - RD/WR Clock Pulse
Figure 19 - 8031/8051/8085 Read Timing Diagram
Figure 20 - 8031/8051/8085 Write Timing Diagram
13
Output Capacitance (IRQ/CP)
C
OUT
5
pF
AC Electrical Characteristics
- MPU Interface (continued)-
Voltages are with respect to ground (V
SS
), unless otherwise
Characteristics
Sym.
Min.
Typ.
Max.
Units
Conditions
t
CYC
t
R
t
PWH
t
PWL
RD/WR
t
F
RD
CS, RS0
DATA BUS
t
PWL
t
AS
t
AH
t
PWH
t
DDR
t
DHR
WR
CS, RS0
DATA BUS
t
PWL
t
AS
t
AH
t
PWH
t
DSW
t
DHW
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