MT88E45BS1 Zarlink, MT88E45BS1 Datasheet - Page 14

• Manufacturer Part Number: MT88E45BS1
• Description: Caller ID CMOS 3.58MHz 3.3V 20-Pin SOIC Tube
• Manufacturer: Zarlink

Specifications of MT88E45BS1

• Package: 20SOIC
• Telecommunication Standards Supported: ANSI/TIA/EIA-716|ETSI/ETS 300 778-1|GR-30|SIN227|SIN242|SR-TSV-002476|TIA/EIA-777
• Fabrication Technology: CMOS
• Maximum Data Rate: 1212 Bd
• Typical Operating Supply Voltage: 3.3 V
• Typical Supply Current: 2.8 mA
• Minimum Operating Temperature: -40 °C
• Maximum Operating Temperature: 85 °C
• Operating Frequency: 3.58 MHz

Advance Information
Gain Setting Resistor Calculation Example for Figure 8:
•
•
•
•
Example:
For the desired nominal Vdd, use Figure 8 to determine approximate A
For the GS1 op-amp, start with the 0dB gain setting resistor values of R5
Figure 7 these values are 53K7, 60K4 and 464K respectively. Keep C1,C2,R1,R2,R3,R4 as in Figure 7
to maintain the highpass corner frequency constant for all gain settings.
For the desired gain setting of A
Repeat for R
R7
R5
1/R6
•
•
•
Av
Av
For a gain of -3.5dB, A
R7
R5
Therefore R6
= R7
= R5
A
Av
v
-3.5dB
-3.5dB
= 1/R5
is now 309K/464K = 0.666
10
1.00
0.95
0.90
0.85
0.80
0.75
0.70
0.65
0.60
0.55
0.50
0dB
0dB
, R
= 464K x 0.668 = 309K9, the closest standard resistor value is 309K.
= 53K6 x 0.666 = 35K7, the closest standard resistor value is 35K7.
3.0
x A
x A
11
Av
, R
V
V
- 1/R7
0.668
0.531
-3.5dB
12
Figure 8 - Gain Ratio as a Function of Nominal Vdd
for the GS2 op-amp.
Av
is calculated to be 40K4, the closest standard resistor value is 40K2.
v
=10
Gain ratio for
Bellcore GS1, GS2
ETSI GS2 op amps
v
:
3.5
-3.5/20
= 0.668
Calculate R6
the closest standard resistor value as R6
Scaled for desired gain. Choose
the closest standard resistor value as R7
Actual A
Scaled for good common mode range. Choose
the closest standard resistor value as R5
Nominal Vdd (Volts)
v
from now on is R7
4.0
Av
so that R5
Gain ratio for ETSI
GS1 op amp
Av
=R6
Av
4.5
v
.
/R7
0dB
Av
0db
|| R7
, R6
0dB
Av
Av
Av
Av
. Choose
.
.
.
0.794
and R7
MT88E45
5.0
0dB
. In
13