Rainbow Electronics MAX3745 User Manual
General Description
The MAX3744/MAX3745 transimpedance amplifiers provide 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 capacitance. The parts also have >2mA
P-P
AC input overload.
Both parts operate from a single +3.3V supply and consume 93mW. The MAX3744/MAX3745 are in a compact
30-mil x 50-mil die and require no external compensation capacitor. A space-saving filter connection is provided for positive bias to the photodiode through an
on-chip 580Ω resistor to VCC. 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 provides an RSSI output using a Maxim-proprietary* interface 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
Features
♦ Up to 2.7Gbps (NRZ) Data Rates
♦ RSSI Implementation in 4-Pin TO46 Header
(MAX3744)
♦ 10ps
P-P
Deterministic Jitter for <100µA
P-P
Input
Current
♦ 330nA
RMS
Input-Referred Noise at 2.1GHz
Bandwidth
♦ 28mA Supply Current at +3.3V
♦ 2GHz Small-Signal Bandwidth
♦ 2.0mA
P-P
AC Overload
♦ Die Size: 30 mils x 50 mils
MAX3744/MAX3745
2.7Gbps SFP Transimpedance
Amplifiers with RSSI
________________________________________________________________ Maxim Integrated Products 1
Ordering Information
V
CC
FILTER
4-PIN TO CAN
400pF
400pF
IN
OUT+
OUT-
GND
OUT+
0.1
µ
F
0.1
µ
F
3.3k
Ω
IN+
V
CC
IN-
RSSI
DISABLE LOS
OUT-
MAX3748A
SFP OPTICAL RECEIVER
HOST
BOARD
MOD-DEF1
MOD-DEF2
4.7kΩ
TO
10kΩ
V
CC
MAX3744
DS1858/
DS1859
3.3V
Typical Application Circuit
19-2927; Rev 0; 7/03
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.
**Dice are guaranteed to operate from -40°C to +85°C, but are
tested only at T
A
= +25°C.
*Patent pending
MAX3744E/D -40°C to +85°C Dice**
MAX3745E/D -40°C to +85°C Dice**
PART TEMP RANGE PIN-PACKAGE
MAX3744/MAX3745
2.7Gbps SFP Transimpedance
Amplifiers with RSSI
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VCC= +2.97V to +3.63V and TA= -40°C to +85°C. Typical values are at VCC= +3.3V, source capacitance (CIN) = 0.85pF, and TA=
+25°C, unless otherwise noted.) (Notes 1, 2)
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.
Power-Supply Voltage (VCC) .................................-0.5V to +6.0V
Continuous CML Output Current
(OUT+, OUT-) ............................................. -25mA to +25mA
Continuous Input Current (IN)...............................-4mA to +4mA
Continuous Input Current (FILTER).......................-8mA to +8mA
Operating Junction Temperature Range (T
J
) ....-55°C to +150°C
Storage Ambient Temperature Range (T
STG
) ...-55°C to +150°C
Die Attach Temperature...................................................+400°C
Supply Current I
Input Bias Voltage 1.0 V
Input Overload (Note 3) 2 mA
Input-Referred Noise I
Differential Transimpedance Differential output, IIN = 40µA
Small-Signal Bandwidth (Note 3) BW
Low-Frequency Cutoff -3dB, input current = 20µA
Deterministic Jitter
(Notes 3, 5)
Filter Resistance 510 580 690 Ω
Differential Output Resistance
(OUT+, OUT-)
Maximum Differential Output
Voltage
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Including CML output current (IIN = 0) 28 41 mA
CC
CIN = 0.85pF, BW = 933MHz 206
CIN = 0.85pF, BW = 2.1GHz 330 430
CIN = 0.85pF, BW = 18GHz 620
N
CIN = 0.6pF, BW = 933MHz 206
CIN = 0.6pF, BW = 2.1GHz 300 380
CIN = 0.6pF, BW = 18GHz 550
-3dB, CIN = 0.6pF 1.8 2
= 0.85pF 1.6 1.8
IN
< input ≤
P-P
P-P 2.7Gbps, 2
< input ≤
P-P
P-P
(output in limited state)
CC
V
DJ
OD
-3dB, C
100µA
2mA
10µA
100µA
Input > 50µA
V
AVE
(Note 3) 30 kHz
AVE
2.1Gbps, K28.5 pattern 14 31
31
-1 pattern 24
2.1Gbps, K28.5 pattern 10 16
2.7Gbps, 231-1 pattern 20
, output termination 50Ω to
AVE
2.8 3.5 4.5 kΩ
85 100 115 Ω
220 280 400 mV
nA
ps
P-P
RMS
GHz
P-P
P-P
MAX3744/MAX3745
2.7Gbps SFP Transimpedance
Amplifiers with RSSI
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(VCC= +2.97V to +3.63V and TA= -40°C to +85°C. Typical values are at VCC= +3.3V, source capacitance (CIN) = 0.85pF, and TA=
+25°C, unless otherwise noted.) (Notes 1, 2)
Note 1: Die parameters are production tested at room temperature only, but are guaranteed by design and characterization from
-40°C to +85°C.
Note 2: Source capacitance represents the total capacitance at the IN pad during characterization of the noise and bandwidth para-
meters.
Note 3: Guaranteed by design and characterization.
Note 4: Input-referred noise is:
Note 5: Deterministic jitter is the sum of pulse-width distortion (PWD) and pattern-dependent jitter (PDJ).
Note 6: Power-supply noise rejection PSNR = -20log(∆V
OUT
/ ∆VCC), where ∆V
OUT
is the differential output voltage and ∆VCCis the
noise on V
CC
.
Note 7:
A
IIAIIA
A
where I
II
RSSI range is from I A to A
RSSI
OUT CM IN OUT CM IN
OUT CM
OUT OUT
IN
=
=− =
=
+
=
+−
__
_
()()
400 0
400
2
6 500
µµ
µ
µµ
RMS output noise
Gain at f MHz=
100
Single-Ended Output CommonMode Minimum Level (MAX3744)
Output Data Transition Time
Differential Output Return Loss
Power-Supply Noise Rejection PSNR
RSSI Gain (MAX3744) A
RSSI Gain Stability (MAX3744)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
RSSI
Relative to V
Input > 200µA
(Note 3)
Frequency ≤ 1GHz 17
1GHz < frequency ≤ 2GHz 10
I
= 0
IN
(Note 6)
(Note 7) 21 A/A
10log(A
A
at 3.3V, +25°C (Note 3)
RSSI
, IIN = 1mA
CC
20% to 80% rise/fall time
P-P
RSSI/ARSSI-NOM
AVE
f < 1MHz 46
1MHz ≤ f < 10MHz 34
) where A
RSSI-NOM
540 490 mV
=
80 140 ps
0.24 dB
TBD
dB
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