MT8841 Mitel, MT8841 Datasheet - Page 5

• Manufacturer Part Number: MT8841
• Description: CMOS Calling Number Identification Circuit
• Manufacturer: Mitel

Applications
The circuit shown in Figure 6 illustrates the use of
the MT8841 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 MT8841 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
-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
MT8841
PWDN
DCLK
DATA
VDD
IC2
IC1
CD
DR
+5V
R3
R4
C3
MT8841
To
Controller
5-15