LG1605DXB Ver la hoja de datos (PDF) - Agere -> LSI Corporation
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LG1605DXB Datasheet PDF : 12 Pages
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LG1605DXB Limiting Amplifier
Data Sheet
February 1999
Test Circuit
50 Ω
50 Ω
SOURCE
1.5 V +
RINT ≤ 10 kΩ
(SEE NOTE 1)
+
5.2 V
TF1003C FIXTURE BOUNDARY
0.047 µF
VBR
LG1605DXB 8
VSS
5 Ω GND
7
1, 4, 5, 6, 15, 16
0.047 µF
5Ω
V–REF 9
110 pF
110 pF
25 kΩ CHIP BOUNDARY
0.047 µF V–IN 10
50 Ω
V+IN 11
0.047 µF V+REF 12
50 Ω
5Ω
0.047 µF
110 pF
+–
–+
25 kΩ
–+
+–
–+
3 V–OUT
2 V+OUT
0.047 µF
0.047 µF
50 Ω
50 Ω
LOAD
(SEE NOTE 2)
13
VBF
14
VBS
1. Depending on the desired supply rejection, VBR can be biased with a simple resistive divider, or resistor/zener diode network.
12-3215(F)r.6
Alternatively, when the LG1605DXB is followed by the LG1600 clock and data regenerator, a resistive divider with bypassing capacitor may
be connected to pin 7 (VREF) of the LG1600 (VREF ≈ –3.2 V). This arrangement provides excellent temperature stability and power supply
rejection.
2. The outputs may be either ac coupled, as indicated, or dc terminated into 50 Ω. In the first case, good output return loss (see Figure 8) can be
obtained. The latter configuration provides a 0 mV to –600 mV output swing (when limiting) for easy interface to dc-coupled circuits. No input
coupling capacitors are needed when interfacing with the LG1600 or the 1319 receiver.
Figure 3. LG1605DXB Test Circuit (with TF1003C Test Fixture)
0.047 µF
(SEE NOTE 1)
12 kΩ
0.047 µF
(SEE NOTE 1)
8.2 kΩ
13.6 kΩ
VREF
≈ –3.2 V
(PIN 7 LG1600)
VBR
–1.5 V
A. Using LG1600 Reference Voltage
20 kΩ
VBR
–1.5 V
B. Using Supply Voltage
VSS
–5.2 V
12-3216(F)r.3
1. Depending on the desired supply rejection, VBR can be biased with a simple resistive divider, or resistor/zener diode network.
Alternatively, when the LG1605DXB is followed by the LG1600 clock and data regenerator, a resistive divider with bypassing capacitor may
be connected to pin 7 (VREF) of the LG1600 (VREF ≈ –3.2 V). This arrangement provides excellent temperature stability and power supply
rejection.
Figure 4. Bias Options
6
Lucent Technologies Inc.
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