參數(shù)資料
型號(hào): MT8880C
廠商: Mitel Networks Corporation
英文描述: Integrated DTMF Transceiver(雙音多頻信號(hào)(DTMF)收發(fā)器(帶電話程序?yàn)V波器))
中文描述: 集成雙音多頻收發(fā)器(雙音多頻信號(hào)(DTMF)的收發(fā)器(帶電話程序?yàn)V波器))
文件頁(yè)數(shù): 16/24頁(yè)
文件大小: 188K
代理商: MT8880C
MT8880C
ISO
2
-CMOS
4-48
Timing is over recommended temperature & power supply voltages.
Typical figures are at 25
°
C and for design aid only: not guaranteed and not subject to production testing.
* The data bus output buffers are no longer sourcing or sinking current by t
DHR
.
#
See Figure 6 regarding guard time adjustment.
NOTES: 1)
dBm=decibels above or below a reference power of 1 mW into a 600 ohm load.
2)
Digit sequence consists of all 16 DTMF tones.
3)
Tone duration=40 ms. Tone pause=40 ms.
4)
Nominal DTMF frequencies are used.
5)
Both tones in the composite signal have an equal amplitude.
6)
The tone pair is deviated by
1.5%
2 Hz.
7)
Bandwidth limited (3 kHz) Gaussian noise.
8)
The precise dial tone frequencies are 350 and 440 Hz (
±
2%).
9)
For an error rate of less than 1 in 10,000.
10)
Referenced to the lowest amplitude tone in the DTMF signal.
11)
Referenced to the minimum valid accept level.
12)
For guard time calculation purposes.
AC Electrical Characteristics
(Cont‘d)
-
Voltages are with respect to ground (V
SS
) unless otherwise stated.
Characteristics
Sym
Min
Typ
Max
Units
Notes*
28
Data hold time (write)
t
DHW
C
IN
C
OUT
f
C
t
LHCL
t
HLCL
DC
CL
C
LO
10
ns
29
Input Capacitance (data bus)
5
pF
30
Output Capacitance (IRQ/CP)
5
pF
31
D
T
M
F
C
L
K
Crystal/clock frequency
3.5759
3.5795
3.5831
MHz
32
Clock input rise time
110
ns
Ext. clock
33
Clock input duty cycle
110
ns
Ext. clock
34
Clock input duty cycle
40
50
60
%
Ext. clock
35
Capacitive load (OSC2)
30
pF
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