MT8880C Mitel Networks Corporation, MT8880C Datasheet - Page 11

• Manufacturer Part Number: MT8880C
• Description: Integrated DTMFTransceiver
• Manufacturer: Mitel Networks Corporation

DTMF/CP
INPUT
DTMF
OUTPUT
Notes:
R1, R2 = 100 k 1%
R3 = 374
R4 = 3.3 k 10%
R
C1 = 100 nF 5%
C2 = 100 nF 5%
C3 = 100 nF 10%*
C4 = 10 nF 10%
X-tal = 3.579545 MHz
L
= 10 k
TEST POINT
130 pF
Test load for D0-D3 pins
1%
(min.)
C1
MMD6150
(or equivalent)
R1
C4
24 k
Figure 13 - Application Circuit (Single-Ended Input)
X-tal
R
R2
L
2.4 k
5.0 VDC
MMD7000
(or equivalent)
Figure 14 - Test Circuit
* 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.
IN+
IN-
GS
VRef
VSS
OSC1
OSC2
TONE
R/W
CS
ISO
MT8880C/C-1
2
-CMOS
IRQ/CP
St/GT
VDD
TEST POINT
RS0
ESt
D3
D2
D1
D0
2
R3
MT8880C/MT8880C-1
Test load for IRQ/CP pin
C2
V
DD
R4
C3
5.0 VDC
3 k
70 pF
To P
or C
4-43