MAX3744 Datasheet, PDF (1/10 Pages) Maxim Integrated Products – 2.7Gbps SFP Transimpedance Amplifiers with RSSI

19-2927; Rev 1; 8/03
2.7Gbps SFP Transimpedance
Amplifiers with RSSI
General Description
The MAX3744/MAX3745 transimpedance amplifiers pro-
vide a compact, low-power solution for communication
up to 2.7Gbps. They feature 330nA input-referred noise
at 2.1GHz bandwidth (BW) with 0.85pF input capaci-
tance. The parts also have >2mA_P-P AC input overload.
Both parts operate from a single +3.3V supply and con-
sume 93mW. The MAX3744/MAX3745 are in a compact
30-mil x 50-mil die and require no external compensa-
tion capacitor. A space-saving filter connection is pro-
vided for positive bias to the photodiode through an
on-chip 580Ω resistor to V_CC. These features allow
easy assembly into a low-cost TO-46 or TO-56 header
with a photodiode.
The MAX3744 and MAX3748A receiver chip set pro-
vides an RSSI output using a Maxim-proprietary* inter-
face technique. The MAX3744 preamplifier, MAX3748A
postamplifier, and DS1858/DS1859 SFP controller meet
all the SFF-8472 digital diagnostic requirements.
Applications
Up to 2.7Gbps SFF/SFP Optical Receivers
Optimized for Small-Form-Factor Pluggable (SFP)
Optical Receivers
*Patent pending
Features
o Up to 2.7Gbps (NRZ) Data Rates
o RSSI Implementation in 4-Pin TO46 Header
(MAX3744)
o 10ps_P-P Deterministic Jitter for <100µA_P-P Input
Current
o 330nA_RMS Input-Referred Noise at 2.1GHz
Bandwidth
o 28mA Supply Current at +3.3V
o 2GHz Small-Signal Bandwidth
o 2.0mA_P-P AC Overload
o Die Size: 30 mils x 50 mils
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX3744E/D
-40°C to +85°C Dice**
MAX3745E/D
-40°C to +85°C Dice**
**Dice are guaranteed to operate from -40°C to +85°C, but are
tested only at T_A = +25°C.
Typical Application Circuit
SFP OPTICAL RECEIVER
400pF
400pF
V_CC
FILTER OUT+
MAX3744
IN OUT-
GND
4-PIN TO CAN
V_CC
0.1µF
IN+
OUT+
MAX3748A
0.1µF
IN-
OUT-
RSSI DISABLE LOS
3.3kΩ
DS1858/
DS1859
HOST
BOARD
V_CC = 3.3V
4.7kΩ
TO
10kΩ
MOD-DEF1
MOD-DEF2
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