19-2834; Rev 3; 11/05
155Mbps Low-Noise Transimpedance
Amplifier
General Description
The MAX3657 is a transimpedance preamplifier for
receivers operating up to 155Mbps. The low noise, high
gain, and low-power dissipation make it ideal for Class-B
and Class-C passive optical networks (PONs).
The circuit features 14nA input-referred noise, 130MHz
bandwidth, and 2mA input overload. Low jitter is
achieved without external compensation capacitors.
Operating from a +3.3V supply, the MAX3657 con-
sumes only 76mW power. An integrated filter resistor
provides positive bias for the photodiode. These fea-
tures, combined with a small die size, allow easy
assembly into a TO-46 header with a photodiode. The
MAX3657 includes an average photocurrent monitor.
The MAX3657 has a typical optical sensitivity of -38dBm
(0.9A/W), which exceeds the Class-C PON require-
ments. Typical overload is 0dBm. The MAX3657 is avail-
able in die form with both output polarities (MAX3657E/D
and MAX3657BE/D.) The MAX3657 is also available in a
12-pin, 3mm x 3mm thin QFN package.
♦
14nA
RMS
Input-Referred Noise
♦
54kΩ Transimpedance Gain
♦
130MHz (typ) Bandwidth
♦
2mA
P-P
Input Current—0dBm Overload Capability
♦
76mW (typ) Power Dissipation
♦
3.3V Single-Supply Operation
♦
Average Photocurrent Monitor
Features
MAX3657
Ordering Information
PART
MAX3657ETC
MAX3657E/D
MAX3657BE/D
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
12 Thin QFN
Die*
Die*
Applications
Optical Receivers (Up to 155Mbps Operation)
Passive Optical Networks (PONs)
SFP/SFF Transceivers
BiDi Transceivers
*Dice
are designed to operate over a -40°C to +110°C junction
temperature (T
J
) range, but are tested and guaranteed at T
A
=
+25°C.
Pin Configuration appears at end of data sheet.
Typical Application Circuit
3.3V
C
VCC1
C
VCC2
V
CCZ
R
FILT
FILT
C
FILT
IN
V
CC
OUT+
1μF
MAX3964
C
OUT
OUT-
1μF
R
LOAD
200Ω
LIMITING AMPLIFIER
MAX3657
GND
MON
TO-46 HEADER
R
MON
*
*OPTIONAL COMPONENT
________________________________________________________________
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.
155Mbps Low-Noise Transimpedance
Amplifier
MAX3657
ABSOLUTE MAXIMUM RATINGS
Power-Supply Voltage ...........................................-0.5V to +6.0V
Input Continuous Current ................................................±3.5mA
Voltage at OUT+, OUT- ...................(V
CC
- 1.5V) to (V
CC
+ 0.5V)
Voltage at FILT, MON .................................-0.5V to (V
CC
+ 0.5V)
Continuous Power Dissipation
12-Pin TQFN (derate 14.7mW/°C above +70°C) .......1176mW
Operating Temperature Range
12-Pin TQFN ....................................................-40°C to +85°C
Operating Junction Temperature Range
Die .................................................................-40°C to +150°C
Storage Temperature Range .............................-55°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°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.
DC ELECTRICAL CHARACTERISTICS
(V
CC1
= +2.97V to +3.63V, 200Ω load between OUT+ and OUT-, T
A
= -40°C to +85°C. Typical values are at V
CC
= +3.3V, T
A
= +25°C,
unless otherwise noted.) (Note 1)
PARAMETER
Supply Current
Input Bias Voltage
Transimpedance Linear Range
Small-Signal Transimpedance
Output Common-Mode Voltage
Output Resistance (Per Side)
Maximum Differential Output Voltage
Filter Resistor
DC Input Overload
Monitor Nominal Gain
G
NOM
V
CC
= +3.3V, +25°C (Note 2)
I
IN
= 100µA to 1mA
Monitor Gain Stability
(Note 3)
ΔG
I
IN
= 5µA
I
IN
= 2µA
I
IN
= 1µA
Die
TQFN package
Die only
Die only
R
OUT
Z
21
SYMBOL
I
CC
V
IN
I
IN
≤
1mA
0.95 < linearity < 1.05, referred to gain at
1µA
P-P
input
Differential output, I
IN
< 200nA
P-P
AC-coupled outputs
Single-ended output resistance
82
170
640
1
0.8
-1.5
-1.5
-3.0
-4.0
±2.0
2
44
54
V
CC
-
0.225
100
250
800
1.5
1
1.2
+1.5
+2.2
+2.7
+3.4
dB
118
450
960
65
CONDITIONS
MIN
TYP
23
1
MAX
34
1.3
UNITS
mA
V
µA
P-P
kΩ
V
Ω
mV
P-P
Ω
mA
A/A
V
OUT(max)
I
IN
= 2mA
P-P,
V
OUT
= (V
OUT
+) - (V
OUT
-)
R
FILT
AC ELECTRICAL CHARACTERISTICS
(V
CC
= +2.97V to +3.63V, 200Ω load between OUT+ and OUT-, C
IN
= 0.5pF, C
FILT
= 400pF, C
VCC2
= 680pF, T
A
= -40°C to +85°C.
Typical values are at V
CC
= +3.3V, T
A
= +25°C, unless otherwise noted.) (Note 1)
PARAMETER
Small-Signal Bandwidth
Low-Frequency Cutoff
AC Overload
Pulse-Width Distortion
Input-Referred Noise Current
RMS Noise Density
Monitor Bandwidth
PWD
I
n
300nA
P-P
≤
I
IN
≤
2mA
P-P
f = 100MHz (Note 4)
f = 117MHz
f = 100MHz
I
IN
= 1µA
14
1.3
5
SYMBOL
BW
-3dB
CONDITIONS
Relative to gain at 1MHz
-3dB, I
IN
= 1µA
2
22
15
MIN
110
5
25
TYP
MAX
UNITS
MHz
kHz
mA
P-P
ps
P-P
nA
RMS
pA/√Hz
kHz
2
_______________________________________________________________________________________
155Mbps Low-Noise Transimpedance
Amplifier
AC ELECTRICAL CHARACTERISTICS (12-PIN TQFN)
(V
CC
= +2.97V to +3.63V, R
LOAD
= 200Ω, C
IN
= 1.0pF, C
FILT
= 1000pF, C
VCC2
= 0.01µF, T
A
= -40°C to +85°C. Typical values are at
V
CC
= +3.3V, T
A
= +25°C, unless otherwise noted.) (Note 1)
PARAMETER
Small-Signal Bandwidth
Low-Frequency Cutoff
AC Overload
Pulse-Width Distortion
Input-Referred Noise Current
RMS Noise Density
PWD
I
n
SYMBOL
BW
-3dB
CONDITIONS
Relative to gain at 1MHz
-3dB, I
IN
= 1µA
ε
r
≥
10
1µA
P-P
≤
I
IN
≤
2mA
P-P
f = 50MHz (Note 4)
f = 100MHz
f = 100MHz
1.6
22
5
13
1.3
MIN
TYP
95
5
25
MAX
UNITS
MHz
kHz
mA
ps
P-P
nA
RMS
pA/√Hz
MAX3657
Note 1:
Die parameters are production tested at room temperature only, but are guaranteed by design from T
A
= -40°C to +85°C.
AC characteristics guaranteed by design and characterization.
Note 2:
G
NOM
= I
MON
(1mA) / 1mA.
Note 3:
Stability is relative to the nominal gain at V
CC
= +3.3V, T
A
= +25°C.
ΔG(I
IN
) dB = 10 log
10
[ I
MON
(I
IN
) ] / [ I
MON
(1mA) - G
NOM
x (1mA - I
IN
)], V
MON
≤
2.1V, Input t
r,
t
f
> 550ps (20% to 80%).
Note 4:
Total noise integrated from 0 to f.
Typical Operating Characteristics
(MAX3657E/D. V
CC
= 3.3V, C
IN
= 0.5pF, T
A
= +25°C, unless otherwise noted.)
SMALL-SIGNAL TRANSIMPEDANCE
vs. TEMPERATURE
MAX3657 toc01
SUPPLY CURRENT
vs. TEMPERATURE
90
80
SUPPLY CURRENT (mA)
70
60
50
40
30
20
10
MAX3657 toc02
INPUT BIAS VOLTAGE
vs. TEMPERATURE
MAX3657 toc03
60
0.2μA
P-P
TRANSIMPEDANCE GAIN (kΩ)
55
100
1.3
1.2
INPUT BIAS VOLTAGE (V)
1.1
1.0
0.9
0.8
0.7
50
1.0μA
P-P
45
40
35
-40
-20
60
AMBIENT TEMPERATURE (
°
C)
0
20
40
80
0
-40
-20
60
AMBIENT TEMPERATURE (
°
C)
0
20
40
80
-40
-20
0
20
40
60
80
AMBIENT TEMPERATURE (
°
C)
_______________________________________________________________________________________
3
155Mbps Low-Noise Transimpedance
Amplifier
MAX3657
Typical Operating Characteristics (continued)
(MAX3657E/D. V
CC
= 3.3V, C
IN
= 0.5pF, T
A
= +25°C, unless otherwise noted.)
DIFFERENTIAL OUTPUT VOLTAGE
vs. INPUT CURRENT
MAX3657 toc04
PULSE-WIDTH DISTORTION
vs. INPUT CURRENT AMPLITUDE
100
90
PULSE-WIDTH DISTORTION (ps)
80
70
60
50
40
30
20
10
0
0.1
1
10
100
1000
10,000
INPUT SIGNAL AMPLITUDE (μA)
-300
+85°C
-40°C
+25°C
400
300
OUTPUT VOLTAGE (mV
P-P
)
200
100
0
-100
-200
FREQUENCY RESPONSE
MAX3657 toc05
MAX3657 toc06
R
LOAD
= OPEN
Z
21
= 108kΩ
R
LOAD
= 200Ω
Z
21
= 54kΩ
98
95
OUTPUT MAGNITUDE (dBΩ)
92
DIFFERENTIAL OUTPUT
R
LOAD
= 100Ω
Z
21
= 36kΩ
89
86
83
SINGLE-ENDED OUTPUT
V
FILT
= GND
-400
-20
-15
-10
-5
0
5
10
15
20
INPUT CURRENT (μA)
80
100
1k
10k
100k
1M
10M 100M
1G
FREQUENCY (Hz)
BANDWIDTH vs. CAPACITANCE
MAX3657 toc07
INPUT-REFERRED RMS NOISE
vs. CAPACITANCE
MAX3657 toc08
INPUT-REFERRED RMS NOISE
vs. DC INPUT CURRENT
T
J
= +110°C
INPUT-REFERRED NOISE (nA
RMS
)
1.0
0.8
0.6
0.4
0.2
0
T
J
= +25°C
T
J
= -40°C
MAX3657 toc09
275
250
225
200
BANDWIDTH (MHz)
175
150
125
100
75
50
25
0
0.1
0.3
0.5
0.7
0.9
1.1
1.3
T
J
= -40°C
T
J
= +25°C
T
J
= +110°C
35
INPUT-REFERRED NOISE (nA
RMS
)
30
25
20
T
J
= +110°C
15
10
0
T
J
= -40°C
1.2
T
J
= +25°C
1.5
0.2
0.4
0.6
0.8
1.0
1.2
1.4
0.1
1
10
100
1000
10,000
CAPACITANCE (pF)
CAPACITANCE (pF)
DC CURRENT IN (μA)
OUTPUT EYE DIAGRAM
(1.0μA ELECTRICAL INPUT)
50mV
MAX3657 toc10
OUTPUT EYE DIAGRAM
(100μA ELECTRICAL INPUT)
200mV
MAX3657 toc11
OUTPUT EYE DIAGRAM
(1mA ELECTRICAL INPUT)
200mV
MAX3657 toc12
10mV
40mV
40mV
-50mV
1ns/div
-200mV
1ns/div
-200mV
1ns/div
4
_______________________________________________________________________________________
155Mbps Low-Noise Transimpedance
Amplifier
Typical Operating Characteristics (continued)
(MAX3657E/D. V
CC
= 3.3V, C
IN
= 0.5pF, T
A
= +25°C, unless otherwise noted.)
OUTPUT EYE DIAGRAM
(-30dBm OPTICAL INPUT)
MAX3657toc13
MAX3657
OUTPUT EYE DIAGRAM
(-1dBm OPTICAL INPUT)
MAX3657toc14
INPUT IMPEDANCE vs. FREQUENCY
MAGNITUDE OF INPUT IMPEDANCE (Ω)
750
700
650
600
550
500
450
400
350
300
100
1k
10k
100k
1M
10M 100M
1G
FREQUENCY (Hz)
T
J
= +110°C
SMALL SIGNAL
T
J
= +25°C
T
J
= -40°C
MAX3657 toc15
800
6mV/div
2
23-1
PRBS
20mV/div
2
23-1
PRBS
ZARLINK 1A358 PHOTODIODE + MAX3657
1ns/div
ZARLINK 1A358 PHOTODIODE + MAX3657
1ns/div
Pin Description
PIN
1, 9, 11
2
3
4
5
6
7
8
10
12
NAME
N.C.
GND
GNDZ
MON
IN
FILT
V
CCZ
V
CC
OUT+
OUT-
No Connection. Do not connect.
Negative Supply Voltage. Both GND and GNDZ must be connected to ground.
Negative Supply Voltage. Both GND and GNDZ must be connected to ground.
Photocurrent Monitor. This is a current output. Connect a resistor between MON and ground to monitor the
average photocurrent.
Signal Input. Connect to photodiode anode.
Filter Connection (Optional). Use to bias the photodiode cathode. An internal 800Ω on-chip resistor is connected
between this pin and V
CCZ
; an external decoupling capacitor connected to this pin forms a filter (see the
Design
Procedure
section).
Power-Supply Voltage. Both V
CC
and V
CCZ
must be connected to the supply.
Power-Supply Voltage. Both V
CC
and V
CCZ
must be connected to the supply.
Positive Data Output. This output has 100Ω back termination, increasing input current causes OUT+ to increase.
Negative Data Output. This output has 100Ω back termination, increasing input current causes OUT- to decrease.
FUNCTION
_______________________________________________________________________________________
5
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