MT88E41AN ZARLINK [Zarlink Semiconductor Inc], MT88E41AN Datasheet - Page 8

• Manufacturer Part Number: MT88E41AN
• Description: CMOS Extended Voltage Calling Number Identification Circuit (ECNIC)
• Manufacturer: ZARLINK [Zarlink Semiconductor Inc]

SEMICMF.019
Data Sheet
2.0
The circuit shown in Figure 6 illustrates the use of the MT88E41 device in a typical FSK receiver system. Bellcore
Special Report SR-TSV-002476 specifies that the FSK receiver should be able to receive FSK signal levels as
follows:
Received Signal Level at 1200Hz:
Received Signal Level at 2200Hz:
This condition can be attained by choosing suitable values of R1 and R2. The MT88E41 configured in a unity gain
mode as shown in Fig. 6 meets the above level requirements.
For applications requiring detection of lower FSK signal level, the input op amp may be configured to provide
adequate gain.
Notes:
R1, R2 = 100 k
R3, R4 = 100 k
C1, C2, C3 = 0.1 F 20%
X-tal = 3.579545 MHz
Applications
-32dBm to -12dBm
-36dBm to -12dBm
1%
10%
C1
C2
Figure 6 - Application Circuit (Single-Ended Input)
R1
R2
X-tal
IN +
IN -
GS
VRef
CAP
OSC1
OSC2
VSS
MT88E41
PWDN
DATA
DCLK
VDD
IC2
IC1
CD
DR
VDD
R3
R4
C3
MT88E41
To
Controller
7