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Número de pieza
componentes Descripción
MT8880CN Ver la hoja de datos (PDF) - Zarlink Semiconductor Inc
Número de pieza
componentes Descripción
Fabricante
MT8880CN
ISO²-CMOS Integrated DTMF Transceiver
Zarlink Semiconductor Inc
MT8880CN Datasheet PDF : 22 Pages
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DTMF/CP
INPUT
C1
R1
R2
DTMF
OUTPUT
R5
C4
X-tal
R
L
ISO
2
-CMOS
MT8880C
MT8880C
IN+
VDD
IN-
St/GT
GS
VRef
ESt
R3
D3
VSS
D2
OSC1
D1
OSC2
D0
TONE
R/W
IRQ/CP
Φ
2
CS
RS0
V
DD
C3
C2
R4
To
µ
P
or
µ
C
Notes:
R1, R2 = 100 k
Ω
1%
R3 = 374 k
Ω
1%
R4 = 3.3 k
Ω
10%
R5 = 4.7 M
Ω
10%
R
L
= 10 k
Ω
(min.)
C1 = 100 nF 5%
C2 = 100 nF 5%
C3 = 100 nF 10%*
C4 = 10 nF 10%
X-tal = 3.579545 MHz
* Microprocessor based systems can inject undesirable noise into
the supply rails. The performance of the MT8880 can be optimized
by keeping noise on the supply rails to a minimum. The decoupling
capacitor (C3) should be connected close to the device and ground
loops should be avoided.
Figure 13 - Application Circuit (Single-Ended Input)
MMD6150
(or equivalent)
TEST POINT
5.0 VDC
2.4 k
Ω
130 pF
24 k
Ω
MMD7000
(or equivalent)
TEST POINT
5.0 VDC
3 k
Ω
70 pF
Test load for D0-D3 pins
Test load for IRQ/CP pin
Figure 14 - Test Circuit
11
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