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PDF MAX3864 Data sheet ( Hoja de datos )
| Número de pieza | MAX3864 | |
| Descripción | 2.5Gbps / +3V to +5.5V / Wide Dynamic Range Transimpedance Preamplifier | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-1790; Rev 0; 8/00
2.5Gbps, +3V to +5.5V, Wide Dynamic Range
Transimpedance Preamplifier
General Description
The MAX3864 is a transimpedance preamplifier for
applications in SDH/SONET systems operating up to
2.5Gbps. It features 490nA (typ) input-referred noise,
2.0GHz bandwidth, and 2mA input overload.
The MAX3864 operates from a single +3.0V to +5.5V
supply. It includes an integrated low-frequency com-
pensation capacitor, as well as a filter connection that
provides positive bias through a 750Ω resistor to VCC.
These features save external components, simplifying
design and assembly into a TO-46 header with a photo-
diode.
The MAX3864 has a typical optical dynamic range of
-24dBm to 0dBm using a PIN photodetector.
Applications
SDH/SONET Transmission Systems
PIN Preamplifier Receivers
APD Preamplifier Receivers
2.5Gbps ATM Receivers
Regenerators for SDH/SONET
Features
o 490nA (typ) Input-Referred Noise
o 2000MHz Bandwidth
o 2mA Input Overload
o 100Ω Differential Output Impedance
o 112mW Power Dissipation at +3.3V
o Integrated Filter Resistor
o CML Outputs
o Single +3.0V to +5.5V Supply Voltage
Ordering Information
PART
TEMP. RANGE PIN-PACKAGE
MAX3864ESA
MAX3864E/D
-40°C to +85°C
-40°C to +85°C
8 SO
Dice*
* Dice are designed to operate with junction temperatures of -40°C
to +140°C but are tested and guaranteed only at TA = +25°C.
Pin Configuration
TOP VIEW
VCC 1
N.C. 2
IN 3
FILTER 4
MAX3864
8 GND
7 OUT+
6 OUT-
5 GND
SO
CFILTER
400pF
Typical Application Circuit
VCC
0.01µF
750Ω
VCC
FILTER
PHOTODIODE
OUT+
IN
0.1µF
100Ω
MAX3864
OUT-
GND
0.1µF
LIMITING
AMPLIFIER
________________________________________________________________ Maxim Integrated Products 1
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
1 page  
2.5Gbps, +3V to +5.5V, Wide Dynamic Range
Transimpedance Preamplifier
MAX3864
RF = 1k
VOLTAGE
OUTPUT
OUTPUT
TRANSIMPEDANCE AMPLIFIER
AMPLIFIER
BUFFER 50Ω
FILTER
IN OUT+
OUT-
50Ω
VCC
FILTER
750Ω
LOWPASS FILTER
DISABLE
DC CANCELLATION
CIRCUIT
VCC
GND
Figure 1. Functional Diagram
AMPLITUDE
AMPLITUDE
INPUT FROM PHOTODIODE
TIME
OUTPUT (SMALL SIGNALS)
OUTPUT (LARGE SIGNALS)
Figure 2. Limited Output
For optimum supply-noise rejection, the MAX3864
should be terminated with a differential load. If a single-
ended output is required, the unused output should be
terminated with 50Ω to VCC. The MAX3864 will not drive
a DC-coupled, 50Ω grounded load.
Output Filter
The MAX3864 includes a one-pole lowpass filter that
limits the circuit bandwidth and improves noise perfor-
mance.
DC Cancellation Circuit
The DC cancellation circuit uses low-frequency feed-
back to remove the DC component of the input signal
(Figure 3). This feature centers the input signal within the
TIME
INPUT (AFTER DC CANCELLATION)
Figure 3. DC Cancellation Effect on Input
transimpedance amplifier’s linear range, thereby reduc-
ing pulse-width distortion (PWD) on large input signals.
The DC cancellation circuit is internally compensated
and therefore does not require external capacitors. This
circuit minimizes PWD for data sequences that exhibit a
50% duty cycle and mark density. A duty cycle or mark
density significantly different from 50% causes the
MAX3864 to generate PWD.
DC cancellation current is drawn from the input and
creates noise. For low-level signals with little or no DC
component, this is not a problem. Amplifier noise will
increase for signals with significant DC component (see
Typical Operating Characteristics).
_______________________________________________________________________________________ 5
5 Page 
2.5Gbps, +3V to +5.5V, Wide Dynamic Range
Transimpedance Preamplifier
NOTES
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MAX3864.PDF ] | |
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