19-3015; Rev 3; 2/07
622Mbps, Low-Noise, High-Gain
Transimpedance Preamplifier
General Description
The MAX3658 is a transimpedance preamplifier for
receivers operating up to 622Mbps. Low noise, high
gain, and low power dissipation make it ideal for fiber
access and small form-factor transceivers.
The MAX3658 features 45nA input-referred noise, 18kΩ
transimpedance gain, 580MHz bandwidth, and 2mA
P-P
input overload. Operating from a +3.3V supply, the
MAX3658 consumes only 66mW. 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
MAX3658 also includes an average photocurrent monitor.
The MAX3658 has typical optical sensitivity of -33dBm
(0.9A/W), which exceeds the class-B APON require-
ments. Typical optical overload is 1dBm. The MAX3658
is available in die form with both output polarities
(MAX3658A and MAX3658B). The MAX3658A is also
available in a 3mm x 3mm 8-pin TDFN package.
♦
45nA
RMS
Noise, -33dBm Sensitivity
♦
18.3kΩ Transimpedance Gain
♦
580MHz Bandwidth
♦
2mA
P-P
Input Overload, 1dBm Overload
♦
66mW Power Dissipation
♦
3.3V Operation
♦
Average Photocurrent Monitor
Features
MAX3658
Ordering Information
PART
MAX3658AETA
TEMP RANGE
-40°C to +85°C
PIN-
PACKAGE
8 TDFN
(3mm x 3mm)
8 TDFN
(3mm x 3mm)
Dice*
Dice*
PKG
CODE
T833-3
T833-3
—
—
MAX3658AETA+ -40°C to +85°C
MAX3658AE/D
MAX3658BE/D
—
—
Applications
Optical Receivers (Up to 622Mbps Operation)
Passive Optical Networks
SFF/SFP Transceivers
FTTx Transceivers
Pin Configuration appears at end of data sheet.
+Denotes
lead-free package.
*Dice
are designed to operate over a -40°C to +100°C junction
temperature (T
j
) range, but are tested and guaranteed at T
A
=
+25°C.
Typical Operating Circuit
C
VCC1
+3.3V
C
VCC2
5-PIN TO-46 HEADER
R
FILT
FILT
0.1μF
C
FILT
IN
0.1μF
OUT-
75Ω*
LIMITING AMPLIFIER
OUT+
75Ω*
25Ω*
MAX3748
C
OUT
*
25Ω*
100Ω
MAX3658
GND
MON
R
MON
*OPTIONAL COMPONENTS
________________________________________________________________
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.
622Mbps, Low-Noise, High-Gain
Transimpedance Preamplifier
MAX3658
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (V
CC
) ............................................-0.5V to +4.2V
Current into IN ....................................................................+5mA
Voltage at OUT+, OUT- ...................(V
CC
- 1.2V) to (V
CC
+ 0.5V)
Voltage FILT, MON .....................................-0.5V to (V
CC
+ 0.5V)
Continuous Power Dissipation (T
A
= +85°C)
8-Lead TDFN (derate 24.4mW/°C above +85°C) ......1951.2mW
Operating Temperature Range ...........................-40°C to +85°C
Operating Junction Temperature Range (die) ....-40°C to +150°C
Storage Temperature Range .............................-55°C to +150°C
Die Attach Temperature...................................................+400°C
Lead Temperature (soldering, 10s) .................................+300°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
CC
= +2.97V to +3.63V, 150Ω load between OUT+ and OUT-, T
j
= -40°C to +100°C. Typical values are at V
CC
= +3.3V and T
A
=
+25°C, unless otherwise noted.)
PARAMETER
Supply Current
Input Bias Voltage
Transimpedance Linear Range
Small-Signal Transimpedance
Output Common-Mode Voltage
Differential Output Offset
Output Impedance
Maximum Output Voltage
Filter Resistor
Offset-Correction Disable
Threshold
Input Resistance
Nominal MON Current Gain
MON Output Voltage Range
MON Accuracy (Note 1)
G
MON
V
MON
1µA
≤
I
IN
< 2µA
2µA
≤
I
IN
< 5µA
5µA
≤
I
IN
< 1mA
ΔV
OUT
Z
OUT
V
OUT(MAX)
R
FILT
Z
21
SYMBOL
I
CC
V
IN
I
IN
= 1µA
0.95 < linearity < 1.05
I
IN
< 2µA
P-P
AC-coupled output
I
IN
= 1.3mA
Single ended
I
IN
= 2mA
P-P
I
IN
= 4µA
I
IN
= 1.3mA
Voltage applied at FILT
FILT = 0V
I
MON
/ I
IN
(I
IN
= 1mA, 3.3V, +25°C)
0.8
0
-2.5
-2
-1.5
60
150
15
300
4
15.7
18.3
V
CC
-
0.125
±2
75
240
20
500
0.4
400
1
1.2
2.2
+2.5
+2
+1.5
dB
90
400
25
700
20.9
CONDITIONS
MIN
TYP
20
0.83
MAX
26
1.0
UNITS
mA
V
µA
P-P
kΩ
V
mV
Ω
mV
P-P
kΩ
Ω
V
Ω
A/A
V
Note 1:
Accuracy is defined as 10
log
(I
MON
/ I
IN
).
2
_______________________________________________________________________________________
622Mbps, Low-Noise, High-Gain
Transimpedance Preamplifier
AC ELECTRICAL CHARACTERISTICS
(V
CC
= +2.97V to +3.63V, 150Ω load between OUT+ and OUT-, C
IN
= 0.5pF total, C
FILT
= 400pF, C
VCC2
= 1nF, T
j
= -40°C to +100°C,
T
A
= -40°C to +85°C. Typical values are at V
CC
= +3.3V and T
A
= +25°C, unless otherwise noted. AC characteristics are guaranteed by
design and characterization.)
PARAMETER
Bandwidth
Input-Referred Noise
Noise Density
Low-Frequency Cutoff
Deterministic Jitter (Note 3)
Optical Overload
Optical Sensitivity
DJ
PIN(MAX)
PIN(MIN)
SYMBOL
BW
i
n
(Note 2)
BW = 467MHz
BW = 467MHz
I
IN
= 1µA
2µA
P-P
≤
I
IN
< 10µA
P-P
10µA
P-P
≤
I
IN
< 2mA
P-P
1.0A/W photodiode at 622 Mbps
1.0A/W photodiode at 155 Mbps
0.9A/W photodiode
+1
-7.2
-33
CONDITIONS
MIN
435
TYP
580
45
2.1
30
150
260
55
MAX
UNITS
MHz
nA
RMS
pA/√Hz
kHz
ps
P-P
dBm
dBm
MAX3658
Note 2:
-3dB bandwidth is measured relative to the gain at 10MHz.
Note 3:
Measured using a pattern equivalent to 2
23
- 1 PRBS with 72 CIDs at 622Mbps.
Typical Operating Characteristics
(V
CC
= +3.3V, C
IN
= 0.5pF, T
A
= +25°C, unless otherwise noted.)
SMALL-SIGNAL TRANSIMPEDANCE
vs. TEMPERATURE
MAX3658 toc01
SUPPLY CURRENT vs. TEMPERATURE
MAX3658 toc02
MONITOR CURRENT
vs. DC INPUT CURRENT
MAX3658 toc03
20
30
1000
19
TRANSIMPEDANCE (kΩ)
MONITOR CURRENT (μA)
27
SUPPLY CURRENT (mA)
100
18
24
10
17
21
16
18
1
15
-40
-20
0
20
40
60
80
100
AMBIENT TEMPERATURE (°C)
15
-40
-20
0
20
40
60
80
100
AMBIENT TEMPERATURE (°C)
0.1
0.1
1
10
100
1000
DC INPUT CURRENT (μA)
_______________________________________________________________________________________
3
622Mbps, Low-Noise, High-Gain
Transimpedance Preamplifier
MAX3658
Typical Operating Characteristics (continued)
(V
CC
= +3.3V, C
IN
= 0.5pF, T
A
= +25°C, unless otherwise noted.)
SMALL-SIGNAL LOW-FREQUENCY CUTOFF
vs. DC INPUT CURRENT
MAX3658 toc05
MAX3658 toc06
FILTER VOLTAGE
vs. DC INPUT CURRENT
MAX3658 toc04
DETERMINISTIC JITTER
vs. INPUT CURRENT AMPLITUDE
70
65
DETERMINISTIC JITTER (ps)
60
55
50
45
40
35
30
1000
LOW-FREQUENCY CUTOFF (kHz)
1600
1400
FILTER VOLTAGE (mV)
1200
1000
800
600
400
200
0
1
10
R
FILT
= 20kΩ
100
1000
R
FILT
= 500Ω
100
10
25
20
10,000
1
10
100
SEE NOTE 3
1000
10,000
1
1
10
100
1000
DC INPUT CURRENT (μA)
DC INPUT CURRENT (μA)
INPUT CURRENT (μA
P-P
)
DIFFERENTIAL OUTPUT VOLTAGE
vs. INPUT CURRENT
DIFFERENTIAL OUTPUT VOLTAGE (mV
P-P
)
MAX3658 toc07
FREQUENCY RESPONSE
MAX3658 toc08
BANDWIDTH vs. INPUT CAPACITANCE
MAX3658 toc09
250
90
85
TRANSIMPEDANCE (dBΩ)
80
75
70
65
20 log (V
OUT
/ I
IN
)
60
1200
1000
BANDWIDTH (MHz)
800
600
400
200
0
TEMP = +25°C
200
150
100
50
0
0
5
10
15
20
25
30
INPUT CURRENT (μA
P-P
)
1k
10k
100k 1M 10M 100M
FREQUENCY (Hz)
1G
10G
0
0.3
0.6
0.9
1.2
1.5
INPUT CAPACITANCE (pF)
INPUT-REFERRED RMS NOISE
vs. INPUT CAPACITANCE
MAX3658 toc10
INPUT-REFERRED RMS NOISE
vs. DC INPUT CURRENT
MAX3658 toc11
OUTPUT EYE DIAGRAM
(2μA ELECTRICAL INPUT)
MAX3658 toc12
70
INPUT-REFERRED NOISE (nA
RMS
)
60
50
40
30
20
10
0
0.3
0.6
0.9
1.2
TEMP = +25°C
TEMP = -40°C
TEMP = +110°C
350
INPUT-REFERRED NOISE (nA
RMS
)
300
250
200
2μA 2
31
- 1 PRBS INPUT
AT 622.08Mbps
4.8mV/div
150
100
50
0
I
IN
= 0μA
467MHz BANDWIDTH
1.5
0.1
1
10
100
330ps/div
INPUT CAPACITANCE (pF)
DC INPUT CURRENT (μA)
4
_______________________________________________________________________________________
622Mbps, Low-Noise, High-Gain
Transimpedance Preamplifier
Typical Operating Characteristics (continued)
(V
CC
= +3.3V, C
IN
= 0.5pF, T
A
= +25°C, unless otherwise noted.)
MAX3658
OUTPUT EYE DIAGRAM
(-28dBm OPTICAL INPUT)
MAX3658 toc13
OUTPUT EYE DIAGRAM
(0dBm OPTICAL INPUT)
MAX3658 toc14
2
31
- 1 PRBS INPUT AT 622Mbps
2
31
- 1 PRBS INPUT AT 622Mbps
4.5mV/div
20mV/div
300ps/div
200ps/div
Pin Description
PIN
1
2
3
NAME
V
CC
IN
FILT
+3.3V Supply Voltage
Signal Input. Connect to photodiode anode.
Optional Filter Connection. Use to bias the photodiode cathode. An internal on-chip resistive network
is connected between this pin and V
CC
; an external decoupling capacitor connected to this pin forms
a filter (see the
Design Procedure
section). Leave this pin open if a filter is not required.
Optional Photocurrent Monitor. This is a current output. Connect a resistor between MON and ground
to monitor the average photocurrent. Leave this pin open if a monitor is not required.
Circuit Ground
Positive 75Ω Data Output. Increasing input current causes OUT+ to increase.
Negative 75Ω Data Output. Increasing input current causes OUT- to decrease.
FUNCTION
4
5, 8
6
7
MON
GND
OUT+
OUT-
_______________________________________________________________________________________
5
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