MT88L89
Advance Information
VDD
C3
MT88L89
VDD
IN+
C1
R1
C2
St/GT
ESt
DTMF/CP
INPUT
IN-
R4
GS
R3
R2
D3
VRef
VSS
D2
X-tal
D1
OSC1
OSC2
TONE
R/W/WR
CS
D0
To µP
or µC
IRQ/CP
DS/RD
RS0
DTMF
OUTPUT
RL
Notes:
R1, R2 = 100 kΩ 1%
R3 = 374 Ω 1%
R4 = 3.3 kΩ 10%
RL = 10 k Ω (min.)
C1 = 100 nF 5%
C2 = 100 nF 5%
C3 = 100 nF 10%*
X-tal = 3.579545 MHz
* Microprocessor based systems can inject undesirable noise into the supply rails.
The performance of the MT88L89 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)
4-136
MITEL [ MITEL NETWORKS CORPORATION ]
