S3050 AMCC (Applied Micro Circuits Corp), S3050 Datasheet - Page 2

• Manufacturer Part Number: S3050
• Description: Bicmos Pecl Clock Generator Multi-rate Sonet/sdh Clock Recovery Unit
• Manufacturer: AMCC (Applied Micro Circuits Corp)

DETAILED DESCRIPTION
The S3051 is an integrated limiting amplifier in-
tended for high-frequency fiber-optic applications.
The circuit connects to typical transimpedance am-
plifiers found within a fiber-optic link. The linear
signal output from a transimpedance amplifier can
contain significant amounts of noise, and may vary
in amplitude over time. The S3051 limiting amplifier
quantizes the signal, and outputs a voltage limited
waveform over a 38 dB input dynamic range.
At low signal levels, below 12 mVp-p, the circuit be-
haves as a linear amplifier. At higher levels the
device becomes a limiting amplifier.
Figure 2. Functional Block Diagram
2
S3051
V +
V –
DIN–
DIN+
REF
REF
NC ..... No Connect
V CC = +5V
10
11
12
9
110pF
50
50
110pF
VCC(GS1,GS2)
5k
5k
5k
5k
13
NC
GS1
8
VCC(GS1,SS2)
VCC(OB)
14
GS2
7
The referred wideband input noise (160 Vrms) al-
lows for a less than 1E-9 Bit Error Rate for inputs
down to 2 mVp-p.
The S3051 is designed to allow adjustment of the
DC offset between the DIN+ and DIN– inputs. V
can be used as a reference from which the required
offset can be subtracted to set the DC bias level at
DIN–. Similarly, V
bias level at DIN+. (See Application Information).
If no adjustment is made to the input DC bias level,
two resistors can be connected in a negative feed-
back configuration in order to cancel any DC offset
at the input. This will minimize the pulse width distor-
tion. (See separate S3051 Limiting Amplifier
Application document.)
GND(GS1,GS2)
GND(OB)
15
6
2.5 GBPS LIMITING AMPLIFIER
OB
GND(GS1,GS2)
–REF
GND(OB)
can be used to set the DC
16
5
July 14, 1999 / Revision B
4
3
2
1
GND(OB)
DOUT–
DOUT+
GND(OB)
+REF