19-3467; Rev 2; 12/06
1Gbps to 4.25Gbps Multirate Transimpedance
Amplifier with Photocurrent Monitor
General Description
The MAX3793 transimpedance amplifier provides a
compact low-power solution for applications from
1Gbps up to 4.25Gbps.
The MAX3793 features 195nA input-referred noise,
3.5kΩ transimpedance gain, 2.9GHz bandwidth (C
IN
=
0.3pF) and 2.8mA
P-P
input overload. Operating from a
+3.3V supply, the MAX3793 consumes only 106mW. An
integrated filter resistor provides positive bias for the
photodiode. These features, combined with a small die
size, allow easy assembly into a TO-46 header with a
photodiode. The MAX3793 also includes an average
photocurrent monitor.
The MAX3793 has a typical optical sensitivity of -20dBm
(0.55A/W) at 4.25Gbps. Typical optical overload is
at 4dBm. The MAX3793 and the MAX3748A limiting
amplifiers provide a complete solution for multirate
receiver applications.
♦
4.7ps
P-P
Deterministic Jitter (DJ)
♦
195nA
RMS
Input-Referred Noise
♦
2.9GHz Small-Signal Bandwidth
♦
2.8mA
P-P
AC Overload
♦
Photocurrent Output Monitor
♦
3.5kΩ Differential Gain
♦
Compact Die Size (30 mils x 50 mils)
Features
MAX3793
Applications
SFF/SFP Transceiver Modules from 1Gbps to
4.25Gbps
Gigabit Ethernet Optical Receivers
Multirate Fibre-Channel Optical Receivers
PART
Ordering Information
TEMP RANGE
PIN-PACKAGE
MAX3793E/D
-40°C to +85°C
Dice*
*Dice
are designed to operate from -40°C to +85°C ambient
temperature, but are tested and guaranteed only at T
A
= +25°C.
Typical Application Circuit
SFP OPTICAL RECEIVER
C
VCC
HOST
BOARD
C
FILT
FILT
V
CC
OUT+
0.1μF
IN+
V
CC
OUT+
0.1μF
MAX3793
IN
MON
GND
OUT-
0.1μF
IN-
MAX3748A
OUT-
0.1μF
V
CC
4.7kΩ
TO
10kΩ
DISABLE
LOS
R
MON
MOD-DEF1
DS1856/
DS1859
MOD-DEF2
________________________________________________________________
Maxim Integrated Products
1
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.
1Gbps to 4.25Gbps Multirate Transimpedance
Amplifier with Photocurrent Monitor
MAX3793
ABSOLUTE MAXIMUM RATINGS
Power-Supply Voltage (V
CC
) .................................-0.5V to +4.5V
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
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
(V
CC
= +2.97V to +3.63V, T
A
= -40°C to +85°C. Typical values are at V
CC
= +3.3V, source capacitance C
IN
= 0.60pF, T
A
= +25°C,
unless otherwise noted.) (Notes 1, 2)
PARAMETER
Power-Supply Current
Input Bias Voltage
Input Overload
Optical Input Sensitivity
(850nm, r
e
= 10dB,
Responsiveness = 0.55A/W)
I
OL
(Note 3)
BER = 10
-12
, K28.5, at 1.0625Gbps
BER =
10
-12
,
K28.5, at 2.125Gbps
BER = 10
-12
, K28.5, at 4.25Gbps
BW = 933MHz, 4th-order Bessel filter
Input-Referred Noise (Notes 3, 4)
Differential Transimpedance
Small-Signal Bandwidth
Gain Peaking
Low-Frequency Cutoff
BW
BW = 2000MHz, 4th-order Bessel filter
Unfiltered output
I
IN
= 20µA
AVE
-3dB, C
IN
= 0.6pF (Note 3)
-3dB, C
IN
= 0.3pF (Note 5)
(Note 3)
-3dB, I
IN
= 20µA
AVE
(Note 3)
I
IN
= 20µA
P-P
, K28.5, at 4.25Gbps
20µA
P-P
< I
IN
< 100µA
P-P
, K28.5, at
4.25Gbps
Deterministic Jitter
(Notes 3, 6)
DJ
100µA
P-P
< I
IN
< 2.2mA
P-P
,
K28.5, at 4.25Gbps
T
A
= +100°C
4.7
6
10
10
10
600
85
Outputs terminated by 50Ω to V
CC
, I
IN
>
100µA
P-P
Outputs terminated by 50Ω
to V
CC
20% to 80%, I
IN
>
200µA
P-P
(Note 3)
220
73
T
A
= +100°C
90
750
100
930
115
480
95
ps
Ω
Ω
mV
P-P
2.8
1.9
2.36
2.2
2.8
-23.5
-23
-20
195
377
449
3.5
2.5
2.9
0
70
11
16
27
ps
P-P
264
420
615
4.5
3.2
3.56
kΩ
GHz
dB
kHz
nA
RMS
dBm
SYMBOL
I
CC
CONDITIONS
Measured with AC-coupled output
MIN
TYP
32
MAX
46
1.0
UNITS
mA
V
mA
P-P
T
A
= +100°C, 100µA
P-P
< I
IN
< 2.2mA
P-P
,
K28.5, at 4.25Gbps
Photodiode Resistor
Differential Output Resistance
Maximum Differential Output
Voltage
Output Edge Transition Time
R
FILT
R
OUT
V
OD(MAX)
2
_______________________________________________________________________________________
1Gbps to 4.25Gbps Multirate Transimpedance
Amplifier with Photocurrent Monitor
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +2.97V to +3.63V, T
A
= -40°C to +85°C. Typical values are at V
CC
= +3.3V, source capacitance C
IN
= 0.60pF, T
A
= +25°C,
unless otherwise noted.) (Notes 1, 2)
PARAMETER
Differential Output Return Loss
Single-Ended Output Return Loss
Power-Supply Noise Rejection
(Note 7)
Minimum Photocurrent to be
Detected
Maximum Photocurrent to be
Detected
Maximum Photocurrent Monitor
Output Offset
Photocurrent Monitor Output
Offset Temperature Dependency
Monitor Output Compliance
Voltage
Photocurrent Monitor Gain
Photocurrent Monitor Gain
Stability
Photocurrent Monitor Gain
Bandwidth
PSNR
I
AVGMIN
I
AVGMAX
I
MON
(OFFSET)
MAX3793
SYMBOL
CONDITIONS
Frequency
≤
1GHz
1GHz < frequency
≤
4GHz
Frequency
≤
1GHz
1GHz < frequency
≤
4GHz
I
IN
= 0, f < 1MHz
I
IN
= 0, 1MHz
≤
f < 10MHz
MIN
TYP
18
9
14
11
47
22
MAX
UNITS
dB
dB
dB
2
1
I
IN
= 0µA
P-P
I
IN
= 0µA
P-P
ΔI
MON(OFFSET)
= ABS (I
MON(OFFSET)
(-40°C) - I
MON(OFFSET)
(+100°C))
0
2µA
≤
I
AVG
≤
1.0mA
2µA
≤
I
AVG
≤
1.0mA (Notes 3, 8)
2µA
≤
I
AVG
≤
1.0mA
-10
7
1
+10
10
µA
mA
µA
ΔI
MON
(OFFSET)
0.21
µA
V
MON
A
MON
2
V
A/A
%
MHz
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 external capacitance at the IN pad during characterization of the noise and band-
width parameters.
Note 3:
Guaranteed by design and characterization.
Note 4:
Input-referred noise is:
⎛
RMS Output Noise
⎞
⎜
⎟
⎝
Gain at f
=
100MHz
⎠
Note 5:
Values are derived by calculation from the C
IN
= 0.6pF measurements.
Note 6:
DJ is the sum of pulse-width distortion (PWD) and pattern-dependent jitter (PDJ). DJ is measured using a 3.2GHz 4th-order
Bessel filter on the input.
Note 7:
Power-supply noise rejection PSNR = -20log(ΔV
OUT
/
ΔV
CC
), where
ΔV
OUT
is the change in differential output voltage and
ΔV
CC
is the noise on V
CC
.
Note 8:
Gain stability is defined as
(A
MON
- A
MON-NOM
) / (A
MON-NOM
)
over the listed current range, temperature, and supply variation. Nominal gain is measured at V
CC
= +3.3V and +25°C.
_______________________________________________________________________________________
3
1Gbps to 4.25Gbps Multirate Transimpedance
Amplifier with Photocurrent Monitor
MAX3793
Typical Operating Characteristics
(V
CC
= +3.3V, C
IN
= 0.6pF, T
A
= +25°C, unless otherwise noted.)
INPUT-REFERRED NOISE
vs. TEMPERATURE
MAX3793 toc01
FREQUENCY RESPONSE
MAX3793 toc02
DETERMINISTIC JITTER
vs. INPUT AMPLITUDE
DATA RATE = 4.25Gbps
K28.5 PATTERN, UNFILTERED INPUT
MAx3793 toc03
600
INPUT-REFERRED NOISE (nA
RMS
)
75
18
15
12
9
6
3
0
500
UNFILTERED
400
65
300
BW = 2.0GHz
200
60
55
100
-40
-20
0
20
40
60
80
100
TEMPERATURE (°C)
50
10M
100M
1G
10G
FREQUENCY (Hz)
DETERMINISTIC JITTER (ps
P-P
)
70
GAIN (dBΩ)
20μ
400μ
800μ
1.2m
1.6m
2.0m
INPUT AMPLITUDE (A
P-P
)
SMALL-SIGNAL TRANSIMPEDANCE
vs. TEMPERATURE
MAX3793 toc04
DIFFERENTIAL S
22
vs. FREQUENCY
-5
-10
-15
S
22
(dB)
-20
-25
-30
MAX3793 toc05
SUPPLY CURRENT
vs. TEMPERATURE
MAX3793 toc06
75
0
70
60
SUPPLY CURRENT (mA)
50
40
30
20
10
0
TRANSIMPEDANCE (dBΩ)
70
65
-35
-40
-45
60
-40
-20
0
20
40
60
80
100
TEMPERATURE (°C)
-50
10M
100M
1G
10G
FREQUENCY (Hz)
-40
-20
0
20
40
60
80
100
TEMPERATURE (°C)
MONITOR OUTPUT CURRENT
vs. AVERAGE INPUT CURRENT
MAX3793 toc07
DC TRANSFER FUNCTION
(V
FILT
= 0V)
150
OUTPUT VOLTAGE (mV)
100
50
0
-50
-100
MAX3793 toc08
1.0
MONITOR OUTPUT CURRENT (mA)
200
0.8
0.6
0.4
0.2
-150
0
0
0.2
0.4
0.6
0.8
1.0
AVERAGE INPUT CURRENT (mA)
-200
-100
-50
0
50
100
INPUT CURRENT (μA)
4
_______________________________________________________________________________________
1Gbps to 4.25Gbps Multirate Transimpedance
Amplifier with Photocurrent Monitor
Typical Operating Characteristics (continued)
(V
CC
= +3.3V, C
IN
= 0.6pF, T
A
= +25°C, unless otherwise noted.)
MAX3793
EYE DIAGRAM
INPUT = 20μA
P-P
, DATA RATE = 1.0625Gbps
MAX3793 toc09
EYE DIAGRAM
INPUT = 20μA
P-P
, DATA RATE = 2.125Gbps
MAX3793 toc10
EYE DIAGRAM
INPUT = 20μA
P-P
, DATA RATE = 4.25Gbps
MAX3793 toc11
K28.5 PATTERN
K28.5 PATTERN
K28.5 PATTERN
10mV/div
10mV/div
10mV/div
200ps/div
100ps/div
48ps/div
EYE DIAGRAM
INPUT = 2.2mA
P-P
, DATA RATE = 4.25Gbps
MAX3793 toc12
EYE DIAGRAM T
A
= +100°C
INPUT = 20μA
P-P
, DATA RATE = 4.25Gbps
MAX3793 toc13
PHOTOCURRENT MONITOR OFFSET
TEMPERATURE DEPENDENCY HISTOGRAM
40
35
% OF UNITS
30
25
20
15
10
5
0
MAX3793 toc14
K28.5 PATTERN
K28.5 PATTERN
45
40mV/div
10mV/div
48ps/div
48ps/div
0-0.14
0.28-0.42
0.56-0.7
0.14-0.28
0.7-0.84
0.42-0.56
I
MON
CHANGE OVER TEMPERATURE (μA)
_______________________________________________________________________________________
5
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