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PDF CXB1572Q Data sheet ( Hoja de datos )
| Número de pieza | CXB1572Q | |
| Descripción | Post amplifier for Optical Fiber Communication Receiver | |
| Fabricantes | Sony Corporation | |
| Logotipo |  |
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CXB1572Q
Post amplifier for Optical Fiber Communication Receiver
Description
The CXB1572Q achieves the 2R optical-fiber
communication receiver functions (Reshaping and
Regenerating) on a single chip. This IC is also
equipped with the signal interruption alarm output
function, which is used to discriminate the existence
of data input.
32 pin QFP (Plastic)
Features
• Auto-offset canceler circuit
• Signal interruption alarm output
• 2-level switching function of identification maximum voltage amplitude for alarm block
• Single 3.3 V power supply
Applications
• FDDI
: 125 Mb/s
• SONET/SDH : 155.52 Mb/s
• ESCON
: 200 Mb/s
• Fiber channel : 265.625 Mb/s
• ATM
: 155.52 Mb/s
Absolute Maximum Ratings
• Supply voltage
• Storage temperature
• Input voltage difference : I VD – VD I
• SW input voltage
• Output current (Continuous)
(Surge current)
VCC – VEE
Tstg
Vdif
Vi
IO
–0.3 to +7.0
–65 to +150
0 to +2.5
VEE to VCC
0 to 50
0 to 100
V
°C
V
V
mA
mA
Recommended Operating Conditions
• Supply voltage
VCC – VEE
• Termination voltage (for data/alarm) VCC – VT1
• Termination voltage (for alarm 2)
VT2
• Termination resistance (for data/alarm) RT1
• Termination resistance (for alarm 2) RT2
• Operating temperature
Ta
3.0 to 3.6
1.8 to 2.2
VEE
46 to 56
460 to 560
–40 to +85
V
V
V
Ω
Ω
°C
Structure
Bipolar silicon monolithic IC
Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by
any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the
operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits.
—1—
E96638-TE
1 page  
CXB1572Q
Pin No. Symbol
Typical pin
voltage (V)
DC AC
Equivalent circuit
Description
28 CAP3 –1.8 V
29 CAP2 –1.8 V
29
80
200
5µA
Connects a peak hold circuit
28 VCCA capacitor for alarm block. 470 pF
80 should be connected to VCCA
each.
CAP2 pin → Peak hold
200 capacitor connection for
alarm level setting block.
5µA CAP3 pin → Peak hold
VEEA capacitor connection for
limiting amplifier signal.
–1090 mV
30
DOWN
(for
VEEI
= –3.3 V)
–1020 mV
31
UP
(for
VEEI
= –3.3 V)
32 VCCA 0 V
VccA
986
123.4
123.4
Connects a resistor for alarm
31 level setting.
Default voltage can be generated
30
Vcs without an external resistor.
SW (Please refer to pin description of
pin No. 3.)
VEEA
3
Positive power supply for analog
block.
—5—
5 Page 
CXB1572Q
Notes on Operation
1. Limiting amplifier block
The limiting amplifier block is equipped with the auto-offset canceler circuit. When external capacitors C1 and
C2 are connected as shown in Fig. 1, the DC bias is set automatically in this block. External capacitor C1 and
IC internal resistor R1 determine the low input cut-off frequency f2 as shown in Fig. 2. Similarly, external
capacitor C2 and IC internal resistor R2 determine the high cut-off frequency f1 for DC bias feedback. Since
peaking characteristics may occur in the low frequency area of the amplifier gain characteristics depending on
the f1/f2 combination, set the C1 and C2 so as to avoid the occurrence of peaking characteristics. The target
values of R1 and R2 and the typical values of C1 and C2 are as indicated below. When a single-ended input
is used, provide AC grounding by connecting Pin 6 to a capacitor which has the same capacitance as
capacitor C1.
R1 (internal): 1.5 kΩ
R2 (internal): 10 kΩ
f2: 4.8 kHz
f1: 72 Hz
C1 (external): 0.022 µF
C2 (external): 0.22 µF
2 kΩ is incorporated between Pins 8 and 9; 3 kΩ between Pins 10 and 11. A resistance value which is to be
inserted in parallel with a capacitor C2 can be selected 5 ways (∞, 5 kΩ, 3 kΩ, 2 kΩ, 2 k//3 kΩ) by external
wiring, and DC feedback can be varied.
D5
C1
6
C1
8
9
C2
10
11
R1
R3
R4
R1
R2
R2
Fig. 1
To IC interior
Feedback
frequency response
Amplifier
frequency response
f1 f2
Frequency
Fig. 2
—11—
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet CXB1572Q.PDF ] | |
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