mt88l85anr1 Zarlink Semiconductor, mt88l85anr1 Datasheet - Page 17

• Manufacturer Part Number: mt88l85anr1
• Description: 3 V Integrated Dtmf Transceiver With Power-down And Adaptive Micro Interface
• Manufacturer: Zarlink Semiconductor

DTMF/CP
INPUT
DTMF
OUTPUT
Notes:
Example of External Component Values:
For Unity Gain:
For +2dB Gain:
R5 = 4.7 MΩ 10%
R1, R4 = 100 kΩ 1%
R2 = 60.4 kΩ 1%
R7 = 3.3 kΩ 10%
R
C1 = 10 nF 5%
C2 = 10 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
R3 = 37.4 kΩ 1%
R5 = 100 kΩ 1%
R3 = 40.2 kΩ 1%
R5 = 127 kΩ 1%
R6 = 374 kΩ 1%
LT
= 10 kΩ (min.) 50 kΩ (max.)
C1
C2
C4
Figure 14 - Application Circuit (Differential Input Configuration)
R1
R4
C6
R3
R5
R
X-tal
LT
R2
R5
*
Microprocessor based systems can inject undesirable noise into the supply rails.
The performance of the MT88L85 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.
MT88L85
NC
IN+
IN-
GS
VRef
VSS
OSC1
OSC2
TONE
R/W/WR
CS
NC
MT88L85
17
IRQ/CP
DS/RD
PWDN
St/GT
VDD
RS0
ESt
NC
D3
D2
D1
D0
R6
C5
V
C3
R7
DD
Data Sheet
To µP
or µC