Maxim MAX3260C-D Datasheet
19-0322; Rev 0; 10/94
1GHz Transimpedance Preamplifier
with 25dB Dynamic Range
_______________General Description
The MAX3260 high-speed transimpedance amplifier is
ideally suited for Fibre Channel and SDH/SONET applications. An extended dynamic range makes the
MAX3260 useful in optical receiver systems with as
much as 25dB of input signal range. A DC-restore feedback network prevents amplifier saturation in all Fibre
Channel applications by allowing input currents as high
as 900µA to be amplified linearly. To reduce noise, the
restore function is disabled at low input levels, allowing
detection of signals as small as 2.4µA with a signal-tonoise ratio of 10.
The filter output (FILTER) of the MAX3260 provides a
convenient voltage source for a photodiode, especially
when the circuit will be placed into a TO-style header
with the photodiode. The filter output is connected to
VCCthrough a 1kΩ on-chip resistor. In combination
with a bypass capacitor, the filter function significantly
reduces the amount of noise present at the cathode of
the photodiode.
The MAX3260 operates from a single +5V supply consuming only 115mW of power when the output is AC
coupled. With 50Ω output termination, it consumes less
than 300mW of power.
________________________Applications
High-Speed Fiber Optics
531Mbps and 1062Mbps Fibre Channel
622Mbps SDH/SONET
Current-to-Voltage Converters
PIN-Preamp Headers
____________________________Features
♦ 1GHz Bandwidth
♦ Single 5V Supply
♦ 25dB Dynamic Range
♦ Optimized for TO-Style Header
______________Ordering Information
PART
MAX3260C/D 0°C to +100°C
TJRANGE PIN-PACKAGE
Dice
___________________Chip Topography
I
FILTER N.C. V
IN
14 13 12 11
1
V
B
CC
OUT
(1.016mm)
GND
10
0.040"
MAX3260
2
VCCB
__________Typical Operating Circuit
3
V
A
CC
DOUT+
LIMITING
AMPLIFIER
50Ω
DIN-
MAX3262
DOUT-
FILTER
V
I
IN
MAX3260
VCCGND
+5V
________________________________________________________________
Zo = 50Ω
OUT
V
A
4
CC
N.C.
0.040"
(1.016mm)
TRANSISTOR COUNT: 16
SUBSTRATE CONNECTED TO GND
Maxim Integrated Products
Call toll free 1-800-998-8800 for free samples or literature.
GND
GND
9
GND
8
7
GND
65
1
1GHz Transimpedance Preamplifier
with 25dB Dynamic Range
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, V
Input Current, I
Input Bias Voltage, V
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
MAX3260
(VCC= +5V, output terminated with 50Ω to ground, 100% tested, TJ= +27°C, unless otherwise noted.)
A, VCCB to GND ...............................0V, 6V
CC
, FILTER..................................................1.5mA
IN
......................................................0V, 6V
IN
DC SPECIFICATIONS
Input Bias Voltage
DC-Restore Time Constant
Filter Resistor Value
Supply Current
DC Transimpedance
DC-Restore Activation Current
IN
DC
FILTER
VCC
RESTORE
50Ω load to ground
IIN> 400µA
IIN< 100µA
AC SPECIFICATIONS (Not production tested)
Peak Input Current
IN
(Notes 1, 2, 3) ps100PWDPulse-Width Distortion
Input Referred Current Noise
RMS
(Notes 2, 4) nA240IN
Note 1: Input is a square wave with 0.5GHz frequency and <200ps rise time.
Note 2: External capacitance on the input ≤ 0.4pF.
Note 3: Pulse-width distortion measured at the 50% level of the output pulses: Input is 900µA, zero-peak.
Note 4: Output noise is measured through a four-pole Bessel filter with -3dB bandwidth of 800MHz.
Noise is then referred to the input by dividing the DC transimpedance.
Output Voltage, V
Operating Junction Temperature Range...........-55°C to +150°C
........................................................0V, 6V
OUT
Processing Temperature..................................................+400°C
CONDITIONS
CONDITIONS UNITSMIN TYP MAXSYMBOLPARAMETER
-400
-2400 -2000 -1600
UNITSMIN TYP MAXSYMBOLPARAMETER
V1.6V
µs1t
Ω750 1250R
mA56 70I
V/A
µA350I
V/A-2400 -2000 -1600GTSmall-Signal Transimpedance
GHz0.8 1.0BWU-3dB Bandwidth
µA900I
dB21PSRRPower-Supply Rejection Ratio
Ω3ROUTOutput Resistance
__________________________________________Typical Operating Characteristics
(TJ = +27°C, unless otherwise noted.)
FREQUENCY RESPONSE
68
67
66
65
64
63
GAIN (dB)
IN
/I
62
OUT
V
61
60
59
58
0
200 400 600 800 1000 14001200
FREQUENCY (MHz)
MAX3260-01
2.0
1.8
1.6
1.4
1.2
(V)
1.0
OUT
V
0.8
0.6
0.4
0.2
DC TRANSFER FUNCTION
0
0
200 400 1000
2 _______________________________________________________________________________________
IIN (µA)
600
MAX3260-03
800
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