LG1605DXB Datasheet, PDF (1/12 Pages) Agere Systems – LG1605DXB Limiting Amplifier

Data Sheet
February 1999
LG1605DXB Limiting Amplifier
Features
s 28 dB gain, 34 dB differential
s Large dynamic range: >60 dB
s Wideband response: 8 kHz to 3 GHz
s Extremely low ±4 ps delay skew across input range
s Complementary 50 Ω I/Os
s Surface-mount package
s Standard ECL supply (400 mW)
Applications
s Data/clock main amplifier SONET/SDH OC-48/
STM-16 transmission systems, DWDM systems
s Digital video transmission
s Interface between 1319 receiver and LG1600
clock and data regenerator
s High-speed comparator
Functional Description
The LG1605DXB is a GaAs wideband limiting ampli-
fier with differential inputs and outputs that provides
28 dB of gain (34 dB differential) and 3 GHz of band-
width in a 50 Ω environment (Figure 1 shows the
block diagram). At low input levels, below 10 mV to
20 mV, the circuit behaves as a linear amplifier. At
higher levels, the device goes smoothly into limiting.
The device matches the performance of an AGC
amplifier but shows none of the AGC bouncing and
attack characteristics.
VBR
8
VSS GND
7
1, 4, 5, 6, 15, 16
110 pF
110 pF
9
V–REF
10
V–IN
11
V+IN
12
V+REF
50 Ω
50 Ω
110 pF
25 kΩ CHIP BOUNDARY
+–
–+
+–
–+
3
V–OUT
2
V+OUT
25 kΩ
–+
13
VBF
14
VBS
Figure 1. LG1605DXB Block Diagram
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