MAX3275 Datasheet, PDF (1/9 Pages) Maxim Integrated Products – Low-Noise, Fibre Channel Transimpedance Amplifiers

19-2207; Rev 1; 3/05
Low-Noise, Fibre Channel Transimpedance
Amplifiers
General Description
The MAX3275/MAX3277 transimpedance amplifiers
provide a compact low-power solution for communica-
tion up to 2.125Gbps. They feature 300nA input-
referred noise at 2.1GHz bandwidth (BW) with 0.85pF
input capacitance. The parts also have 2mA_P-P AC
input overload.
The MAX3277 is identical to the MAX3275, but with the
output polarities inverted for optimum packaging flexi-
bility. Both parts operate from a single 3.3V supply and
consume only 83mW. The MAX3275/MAX3277 are
compact 24mil x 47mil die and require no external com-
pensation capacitor. A space-saving filter connection is
provided for positive bias to the photodiode through an
on-chip 600Ω resistor to V_CC. These features allow
easy assembly into a TO-46 or TO-56 header with a
photodiode.
The MAX3275/MAX3277 and MAX3274 limiting ampli-
fiers provide a two-chip solution for dual-rate, fibre
channel receiver applications.
Applications
Dual-Rate Fibre Channel Optical Receivers
Gigabit Ethernet Optical Receivers
Features
o Up to 2.125Gbps (NRZ) Data Rates
o 7ps_P-P Deterministic Jitter for <100µA_P-P
Input Current
o 300nA_RMS Input-Referred Noise at 2.1GHz
Bandwidth
o 25mA Supply Current at +3.3V
o 2.3GHz Small-Signal Bandwidth
o 2.0mA_P-P AC Overload
o Die Size: 24mil x 47mil
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX3275U/D
MAX3277U/D
0°C to +85°C
0°C to +85°C
Dice*
Dice*
*Dice are guaranteed to operate from 0°C to +85°C, but are test-
ed only at T_A = +25°C.
Typical Application Circuit
C_FILTER
400pF
+3.3V
SMALL FORM FACTOR
OPTICAL RECEIVER
400pF
+3.3V
600Ω
IN
V_CC
MAX3275
0.1µF
MAX3274
OUT+
IN+
TIA
OUT-
100Ω
IN-
0.1µF
LOS LOS
LIMITING
AMP
0.1µF
OUT+
OUT-
0.1µF
GND
TH SQUELCH
BWSEL
660Ω
HOST SERVER
OR SWITCH
4.7kΩ
TO
10kΩ
DESERIALIZER
100Ω
RATE SELECT
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