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PDF MAX3760 Data sheet ( Hoja de datos )
| Número de pieza | MAX3760 | |
| Descripción | Low-Noise Transimpedance Preamplifier | |
| Fabricantes | Maxim Integrated | |
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Hay una vista previa y un enlace de descarga de MAX3760 (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
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19-4765; Rev 1; 11/05
EVAALVUAAILTAIOBNLEKIT 622Mbps, Low-Noise Transimpedance
Preamplifier for LAN and WAN Optical Receivers
General Description
The MAX3760 is a transimpedance preamplifier for
622Mbps ATM applications. It operates from a single
+5V supply and typically consumes only 100mW
power. The preamplifier converts a small photodiode
current to a differential voltage. A DC cancellation cir-
cuit provides a true differential output swing over a
wide range of input current levels, thus reducing pulse-
width distortion.
6.5kΩ transimpedance gain and 560MHz bandwidth,
combined with low 73nA input-referred noise, provide
-31.5dBm typical sensitivity in 1300nm receivers. The
circuit accepts a 1mAP-P input current, resulting in a
typical optical overload of -3dBm. The device operates
over an extended temperature range of -40°C to +85°C.
The MAX3760 is internally compensated and requires
few external components. In die form it includes a
space-saving filter connection, which provides positive
bias for the photodiode through a 1kΩ resistor to VCC.
These features, combined with the die aspect ratio and
dimensioning, allow the MAX3760 to assemble easily
into a TO-style header with a photodiode.
The MAX3760 is designed to be used with either the
MAX3761 or the MAX3762 limiting-amplifier ICs. When
combined with a photodiode, the chipset forms a com-
plete 5V, 622Mbps receiver. The MAX3760 is available
in die form and in an 8-pin SO package.
____________________________Features
♦ 73nA RMS Input-Referred Noise
♦ 560MHz Bandwidth
♦ 1mA Peak Input Current
♦ 6.5kΩ Gain
♦ Operation from -40°C to +85°C
♦ 100mW Typical Power Consumption
♦ Single +5V Supply
Ordering Information
PART
MAX3760ESA
MAX3760E/D
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
8 SO
Dice*
*Dice are designed to operate over a -40°C to +100°C junction
temperature (Tj) range, but are tested and guaranteed at
TA = +25°C.
________________________Applications
622Mbps ATM LAN Optical Receivers
622Mbps WAN Optical Receivers
TOP VIEW
Pin Configuration
VCC 1
IN 2
INREF 3
GND 4
MAX3760
8 COMP
7 OUT+
6 OUT-
5 GND
SO
Typical Application Circuit
+5V
0.01µF
VCC
(FILTER)
1kΩ
100pF
INREF
MAX3760
OUT+
0.01µF
MAX3761
MAX3762
LIMITING
AMPLIFIER
100Ω
(OPTIONAL)
IN OUT-
0.01µF
GND COMP*
( ) INDICATE PINS AVAILABLE ONLY ON THE DIE.
*NOT CONNECTED
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1 page  
622Mbps, Low-Noise Transimpedance
Preamplifier for LAN and WAN Optical Receivers
IN
INREF
D1
RF
VCC
TRANSIMPEDANCE
AMPLIFIER
Q1
Q4
GND
DC
CANCELLATION
AMPLIFIER
VCC
MAX3760
VCC
Q2
1kΩ
R1
PARAPHASE
AMP
R3
VCC
Q3
R4
R2
(FILTER)
OUT-
OUT+
Figure 1. Functional Diagram
COMP
Detailed Description
The MAX3760 is a transimpedance amplifier designed
for 622Mbps fiber optic applications. As shown in the
Functional Diagram (Figure 1), it comprises a transim-
pedance amplifier, a paraphase amplifier with emitter-
follower outputs, and a DC cancellation circuit.
Transimpedance Amplifier
The signal current at the input flows into a high-gain
amplifier’s summing node. Shunt feedback through RF
converts this current to a voltage with 6.5kΩ gain.
Diode D1 clamps the output voltage for large input cur-
rents. INREF is a direct connection to the input transis-
tor’s emitter, and must be connected directly to the
photodetector AC ground return for best performance.
Paraphase Amplifier
The paraphase amplifier converts single-ended signals to
differential signals and introduces a voltage gain of 2.
This signal drives a pair of internally biased emitter follow-
ers, Q2 and Q3, which form the output stage. Resistors
R1 and R2 provide back-termination at the output, deliv-
ering a 100Ω differential output impedance. The output
emitter followers are designed to drive a 100Ω differential
load between OUT+ and OUT-. The MAX3760 can also
GND ( ) INDICATE PINS AVAILABLE ON DIE ONLY.
be terminated with higher output impedances for
increased gain and output voltage swing. The MAX3760
will not drive a 50Ω load to ground. For best noise rejec-
tion, terminate the MAX3760 with differential loads.
DC Cancellation Circuit
The DC cancellation circuit removes the input signal’s
DC component by employing low-frequency feedback.
This feature centers the input signal within the transim-
pedance amplifier’s dynamic range, thereby reducing
pulse-width distortion on large input signals.
The paraphase amplifier’s output is sensed through
resistors R3 and R4, then filtered, amplified, and fed
back to the base of transistor Q4. The transistor draws
the input signal’s DC component away from the trans-
impedance amplifier’s summing node.
The MAX3760 DC cancellation loop is internally com-
pensated and does not require external capacitors in
most 622Mbps applications. Add external capacitance
at the COMP pin to reduce the DC cancellation circuit’s
frequency response and improve data-dependent jitter.
Connecting the COMP pin directly to GND disables the
circuit. The DC cancellation circuit can sink up to 1mA
at the input.
_______________________________________________________________________________________ 5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet MAX3760.PDF ] | |
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