mt88l89asr1 Zarlink Semiconductor, mt88l89asr1 Datasheet - Page 15

• Manufacturer Part Number: mt88l89asr1
• Description: 3 V Integrated Dtmf Transceiver With Adaptive Micro Interface
• Manufacturer: Zarlink Semiconductor

DTMF/CP
INPUT
DTMF
OUTPUT
Notes:
Example of External Component Values:
For Unity Gain:
For +2dB Gain:
R6 = 374 kΩ 1%
R7 = 3.3 kΩ 10%
R
C1 = 100 nF 5%
C3 = 100 nF 10%
C4 = 0.1 µF (to remove the DC component)
C5 = 100 nF 5%
C6 = 10 nF 10% (to remove any high frequency components)
X-tal = 3.579545 MHz
R5 = 4.7 MΩ 10%
R1 = 100 kΩ 1%
R2 = 100 kΩ 1%
R1 = 100 kΩ 1%
R2 = 127 kΩ 1%
LT
= 10 kΩ (min.) 50 kΩ (max.)
C1
C4
Figure 13 - Application Circuit (Single-Ended Input Configuration)
R1
C6
R5
R
X-tal
LT
R2
*
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.
Zarlink Semiconductor Inc.
NC
IN+
IN-
GS
VRef
VSS
OSC1
OSC2
TONE
R/W/WR
CS
NC
MT88L89
MT88L89
15
IRQ/CP
DS/RD
St/GT
VDD
RS0
ESt
NC
NC
D3
D2
D1
D0
R6
C5
V
C3
R7
DD
Data Sheet
To µP
or µC