MAXIM MAX3657ETC

19-2834; Rev 2; 2/04
155Mbps Low-Noise Transimpedance
Amplifier
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 consumes only 76mW power. 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
MAX3657 includes an average photocurrent monitor.
The MAX3657 has a typical optical sensitivity of -38dBm
(0.9A/W), which exceeds the Class-C PON requirements. Typical overload is 0dBm. The MAX3657 is available 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.
Applications
Optical Receivers (Up to 155Mbps Operation)
Passive Optical Networks (PONs)
Features
♦ 14nARMS Input-Referred Noise
♦ 54kΩ Transimpedance Gain
♦ 130MHz (typ) Bandwidth
♦ 2mAP-P Input Current—0dBm Overload Capability
♦ 76mW (typ) Power Dissipation
♦ 3.3V Single-Supply Operation
♦ Average Photocurrent Monitor
Ordering Information
TEMP RANGE
PIN-PACKAGE
MAX3657ETC
PART
-40°C to +85°C
12 Thin QFN
MAX3657E/D
-40°C to +85°C
Die*
MAX3657BE/D
-40°C to +85°C
Die*
*Dice are designed to operate over a -40°C to +110°C junction
temperature (TJ) range, but are tested and guaranteed at TA =
+25°C.
Pin Configuration appears at end of data sheet.
SFP/SFF Transceivers
BiDi Transceivers
Typical Application Circuit
3.3V
CVCC1
CVCC2
VCCZ
VCC
RFILT
FILT
CFILT
OUT+
1µF
MAX3964
IN
COUT
OUT-
RLOAD
200Ω
LIMITING AMPLIFIER
1µF
MAX3657
GND
MON
TO-46 HEADER
RMON*
*OPTIONAL COMPONENT
________________________________________________________________ Maxim Integrated Products
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.
1
MAX3657
General Description
MAX3657
155Mbps Low-Noise Transimpedance
Amplifier
ABSOLUTE MAXIMUM RATINGS
Power-Supply Voltage ...........................................-0.5V to +6.0V
Input Continuous Current ................................................±3.5mA
Voltage at OUT+, OUT- ...................(VCC - 1.5V) to (VCC + 0.5V)
Voltage at FILT, MON .................................-0.5V to (VCC + 0.5V)
Continuous Power Dissipation
12-Pin QFN (derate 14.7mW/°C above +70°C) .........1176mW
Operating Temperature Range
12-Pin QFN ......................................................-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
(VCC1 = +2.97V to +3.63V, 200Ω load between OUT+ and OUT-, TA = -40°C to +85°C. Typical values are at VCC = +3.3V, TA = +25°C,
unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
Supply Current
ICC
Input Bias Voltage
VIN
Transimpedance Linear Range
Small-Signal Transimpedance
Z21
Output Common-Mode Voltage
Output Resistance (Per Side)
Maximum Differential Output Voltage
Filter Resistor
CONDITIONS
IIN ≤ 1mA
0.95 < linearity < 1.05, referred to gain at
1µAP-P input
2
Differential output, IIN < 200nAP-P
44
AC-coupled outputs
ROUT
Single-ended output resistance
VOUT(max) IIN = 2mAP-P, VOUT = (VOUT+) - (VOUT-)
RFILT
Monitor Gain Stability
(Note 3)
GNOM
∆G
TYP
MAX
UNITS
23
34
mA
1
1.3
V
µAP-P
54
65
VCC 0.225
DC Input Overload
Monitor Nominal Gain
MIN
V
82
100
118
Ω
170
250
450
mVP-P
640
800
960
Ω
1.2
A/A
1
1.5
VCC = +3.3V, +25°C (Note 2)
0.8
1
IIN = 100µA to 1mA
-1.5
+1.5
mA
Die
-1.5
+2.2
QFN package
-3.0
+2.7
IIN = 2µA
Die only
-4.0
+3.4
IIN = 1µA
Die only
IIN = 5µA
kΩ
dB
±2.0
AC ELECTRICAL CHARACTERISTICS
(VCC = +2.97V to +3.63V, 200Ω load between OUT+ and OUT-, CIN = 0.5pF, CFILT = 400pF, CVCC2 = 680pF, TA = -40°C to +85°C.
Typical values are at VCC = +3.3V, TA = +25°C, unless otherwise noted.) (Note 1)
PARAMETER
Small-Signal Bandwidth
SYMBOL
BW-3dB
Low-Frequency Cutoff
CONDITIONS
Relative to gain at 1MHz
Input-Referred Noise Current
TYP
MAX
5
25
110
-3dB, IIN = 1µA
AC Overload
Pulse-Width Distortion
MIN
MHz
2
PWD
In
300nAP-P ≤ IIN ≤ 2mAP-P
UNITS
kHz
mAP-P
22
f = 100MHz (Note 4)
psP-P
15
nARMS
f = 117MHz
14
RMS Noise Density
f = 100MHz
1.3
pA/√Hz
Monitor Bandwidth
IIN = 1µA
5
kHz
2
_______________________________________________________________________________________
155Mbps Low-Noise Transimpedance
Amplifier
(VCC = +2.97V to +3.63V, RLOAD = 200Ω, CIN = 1.0pF, CFILT = 1000pF, CVCC2 = 0.01µF, TA = -40°C to +85°C. Typical values are at
VCC = +3.3V, TA = +25°C, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
Small-Signal Bandwidth
BW-3dB
CONDITIONS
Low-Frequency Cutoff
-3dB, IIN = 1µA
AC Overload
εr ≥ 10
Pulse-Width Distortion
TYP
In
RMS Noise Density
MAX
UNITS
95
MHz
5
25
kHz
1.6
mA
1µAP-P ≤ IIN ≤ 2mAP-P
PWD
Input-Referred Noise Current
MIN
Relative to gain at 1MHz
22
f = 50MHz (Note 4)
5
f = 100MHz
13
f = 100MHz
1.3
psP-P
nARMS
pA/√Hz
Note 1: Die parameters are production tested at room temperature only, but are guaranteed by design from TA = -40°C to +85°C.
AC characteristics guaranteed by design and characterization.
Note 2: GNOM = IMON (1mA) / 1mA.
Note 3: Stability is relative to the nominal gain at VCC = +3.3V, TA = +25°C. ∆G(IIN) dB = 10 log10 [ IMON(IIN) ] / [ IMON(1mA) - GNOM
x (1mA - IIN)], VMON ≤ 2.1V, Input tr, tf > 550ps (20% to 80%).
Note 4: Total noise integrated from 0 to f.
Typical Operating Characteristics
(MAX3657 E/D. VCC = 3.3V, CIN = 0.5pF, TA = +25°C, unless otherwise noted.)
1.0µAP-P
45
MAX3657 toc02
80
70
60
50
40
30
20
40
1.3
1.2
INPUT BIAS VOLTAGE (V)
50
90
SUPPLY CURRENT (mA)
TRANSIMPEDANCE GAIN (kΩ)
0.2µAP-P
55
INPUT BIAS VOLTAGE
vs. TEMPERATURE
100
MAX3657 toc01
60
SUPPLY CURRENT
vs. TEMPERATURE
MAX3657 toc03
SMALL-SIGNAL TRANSIMPEDANCE
vs. TEMPERATURE
1.1
1.0
0.9
0.8
10
35
0
-40
-20
0
20
40
60
AMBIENT TEMPERATURE (°C)
80
0.7
-40
-20
0
20
40
60
AMBIENT TEMPERATURE (°C)
80
-40
-20
0
20
40
60
80
AMBIENT TEMPERATURE (°C)
_______________________________________________________________________________________
3
MAX3657
AC ELECTRICAL CHARACTERISTICS (12-PIN QFN)
Typical Operating Characteristics (continued)
(MAX3657 E/D. VCC = 3.3V, CIN = 0.5pF, TA = +25°C, unless otherwise noted.)
PULSE-WIDTH DISTORTION
vs. INPUT CURRENT AMPLITUDE
DIFFERENTIAL OUTPUT VOLTAGE
vs. INPUT CURRENT
70
60
50
40
-40°C
+85°C
+25°C
30
200
RLOAD = 200Ω
Z21 = 54kΩ
100
0
RLOAD = 100Ω
Z21 = 36kΩ
-100
-200
20
95
92
DIFFERENTIAL OUTPUT
89
SINGLE-ENDED OUTPUT
86
83
-300
10
MAX3657 toc06
RLOAD = OPEN
Z21 = 108kΩ
OUTPUT MAGNITUDE (dBΩ)
OUTPUT VOLTAGE (mVP-P)
80
300
FREQUENCY RESPONSE
98
MAX3657 toc05
90
VFILT = GND
80
-400
0
0.1
1
10
100
1000
-20
10,000
-15
-10
-5
0
5
10
15
20
100
1k
10k
100k
1M
10M 100M
INPUT SIGNAL AMPLITUDE (µA)
INPUT CURRENT (µA)
FREQUENCY (Hz)
BANDWIDTH vs. CAPACITANCE
INPUT-REFERRED RMS NOISE
vs. CAPACITANCE
INPUT-REFERRED RMS NOISE
vs. DC INPUT CURRENT
200
TJ = -40°C
175
TJ = +25°C
150
TJ = +110°C
125
100
75
50
30
25
20
TJ = +110°C
TJ = +25°C
TJ = -40°C
15
10
1.2
TJ = +110°C
1.0
1G
MAX3657 toc09
225
35
INPUT-REFERRED NOISE (nARMS)
250
INPUT-REFERRED NOISE (nARMS)
MAX3657 toc07
275
MAX3657 toc08
PULSE-WIDTH DISTORTION (ps)
400
MAX3657 toc04
100
BANDWIDTH (MHz)
MAX3657
155Mbps Low-Noise Transimpedance
Amplifier
TJ = +25°C
TJ = -40°C
0.8
0.6
0.4
0.2
25
0
0
0.1
0.3
0.5
0.7
0.9
1.1
1.3
0.6
0.8
MAX3657 toc10
1ns/div
1.4
0.1
1
10
100
10,000
OUTPUT EYE DIAGRAM
(1mA ELECTRICAL INPUT)
MAX3657 toc12
200mV
-200mV
1ns/div
1000
DC CURRENT IN (µA)
40mV
-200mV
-50mV
1.2
MAX3657 toc11
200mV
40mV
10mV
1.0
OUTPUT EYE DIAGRAM
(100µA ELECTRICAL INPUT)
OUTPUT EYE DIAGRAM
(1.0µA ELECTRICAL INPUT)
4
0.4
CAPACITANCE (pF)
CAPACITANCE (pF)
50mV
0
0.2
1.5
1ns/div
_______________________________________________________________________________________
155Mbps Low-Noise Transimpedance
Amplifier
INPUT IMPEDANCE vs. FREQUENCY
6mV/
div
223-1 PRBS
223-1 PRBS
20mV/
div
ZARLINK 1A358 PHOTODIODE + MAX3657
ZARLINK 1A358 PHOTODIODE + MAX3657
1ns/div
800
MAGNITUDE OF INPUT IMPEDANCE (Ω)
MAX3657toc14
MAX3657toc13
OUTPUT EYE DIAGRAM
(-1dBm OPTICAL INPUT)
TJ = +25°C
750
MAX3657 toc15
OUTPUT EYE DIAGRAM
(-30dBm OPTICAL INPUT)
TJ = -40°C
700
650
600
TJ = +110°C
550
500
SMALL SIGNAL
450
400
350
300
1ns/div
100
1k
10k
100k
1M
10M 100M
1G
FREQUENCY (Hz)
Pin Description
PIN
NAME
1, 9, 11
N.C.
No Connection. Do not connect.
FUNCTION
2
GND
Negative Supply Voltage. Both GND and GNDZ must be connected to ground.
3
GNDZ
Negative Supply Voltage. Both GND and GNDZ must be connected to ground.
4
MON
Photocurrent Monitor. This is a current output. Connect a resistor between MON and ground to monitor the
average photocurrent.
5
IN
6
FILT
Filter Connection (Optional). Use to bias the photodiode cathode. An internal 800Ω on-chip resistor is connected
between this pin and VCCZ; an external decoupling capacitor connected to this pin forms a filter (see the Design
Procedure section).
7
VCCZ
Power-Supply Voltage. Both VCC and VCCZ must be connected to the supply.
8
VCC
Power-Supply Voltage. Both VCC and VCCZ must be connected to the supply.
10
OUT+
Positive Data Output. This output has 100Ω back termination, increasing input current causes OUT+ to increase.
12
OUT-
Negative Data Output. This output has 100Ω back termination, increasing input current causes OUT- to decrease.
Signal Input. Connect to photodiode anode.
_______________________________________________________________________________________
5
MAX3657
Typical Operating Characteristics (continued)
(MAX3657 E/D. VCC = 3.3V, CIN = 0.5pF, TA = +25°C, unless otherwise noted.)
155Mbps Low-Noise Transimpedance
Amplifier
MAX3657
Functional Diagram
MAX3657
TRANSIMPEDANCE
AMPLIFIER
RF
VOLTAGE
AMPLIFIER
IN
OUTPUT
BUFFER
ROUT
OUT+
OUTROUT
+1.0V
DC-CANCELLATION
CIRCUIT
LOWPASS
FILTER
MON
VCCZ
ROUT
ENABLE
FILT
Detailed Description
The MAX3657 transimpedance amplifier is designed for
155Mbps fiber-optic applications. The functional diagram of the MAX3657 comprises a transimpedance
amplifier, a voltage amplifier, a DC-cancellation circuit,
and a CML output buffer.
Transimpedance Amplifier
The signal current at the input flows into the summing
node of a high-gain amplifier. Shunt feedback through
resistor RF converts this current into a voltage. Schottky
diodes clamp the output signal for large input currents
(Figure 1).
Voltage Amplifier
The voltage amplifier provides additional gain and converts the transimpedance amplifier single-ended output
signal into a differential signal.
Output Buffer
The output buffer provides a reverse-terminated voltage output and is designed to drive a 200Ω differential
load between OUT+ and OUT-. For optimum supplynoise rejection, the MAX3657 should be terminated with
a differential load. The MAX3657 single-ended outputs
6
do not drive a DC-coupled grounded load. The outputs
should be AC-coupled or terminated to VCC. If a singleended output is required, both the used and the unused
outputs should be terminated in a similar manner.
DC-Cancellation Circuit
The DC-cancellation circuit uses low-frequency feedback to remove the DC component of the input signal
(Figure 2). This feature centers the input signal within
the transimpedance amplifier’s linear range, thereby
reducing pulse-width distortion.
The DC-cancellation circuit is internally compensated
and does not require external capacitors. This circuit
minimizes pulse-width distortion for data sequences
that exhibit a 50% mark density. A mark density significantly different from 50% causes the MAX3657 to generate pulse-width distortion. Grounding the FILT pin
disables the DC-cancellation circuit. For normal operation, the DC-cancellation circuit must be enabled.
The DC-cancellation current is drawn from the input and
creates noise. For low-level signals with little or no DC
component, the added noise is insignificant. However,
amplifier noise increases for signals with significant DC
component (see the Typical Operating Characteristics).
_______________________________________________________________________________________
155Mbps Low-Noise Transimpedance
Amplifier
AMPLITUDE
MAX3657
AMPLITUDE
INPUT FROM PHOTODIODE
TIME
TIME
OUTPUT (SMALL SIGNALS)
INPUT AFTER DC CANCELLATION
OUTPUT (LARGE SIGNALS)
Figure 2. Effects of DC Cancellation on Input
Figure 1. MAX3657 Limited Outputs
Photocurrent Monitor
Select RMON
The MAX3657 includes an average photocurrent monitor.
The current at MON is approximately equal to the DC current at IN. Best monitor accuracy is obtained when data
input edge time is longer than 500ps.
Connect a resistor between MON and ground to monitor the average photocurrent. Select RMON as large as
possible:
Design Procedure
Select Photodiode
Noise performance and bandwidth are adversely affected
by stray capacitance on the TIA input node. Select a
low-capacitance photodiode to minimize the total input
capacitance on this pin. The MAX3657 is optimized for
0.5pF of capacitance on the input. Assembling the
MAX3657 in die form using chip and wire technology
provides the lowest capacitance input and the best
possible performance.
Select CFILT
Supply voltage noise at the cathode of the photodiode
produces a current I = CPD ∆V/∆t, which reduces the
receiver sensitivity (C PD is the photodiode capacitance). The filter resistor of the MAX3657, combined
with an external capacitor, can be used to reduce the
noise (see the Typical Application Circuit). Current generated by supply-noise voltage is divided between
CFILT and CPD. To obtain a good optical sensitivity,
select CFILT > 400pF.
Select Supply Filter
The MAX3657 requires wideband power-supply decoupling. Power-supply bypassing should provide low
impedance between VCC and ground for frequencies
between 10kHz and 200MHz. Use LC filtering at the
main supply terminal and decoupling capacitors as
close to the die as possible.
RMON =
2.1V
IMONMAX
where IMONMAX is the largest average input current
observed.
Select Coupling Capacitors
A receiver built with the MAX3657 has a bandpass frequency response. The low-frequency cutoff due to the
coupling capacitors and load resistors is:
LFCTERM =
1
2π x RLOAD x CCOUPLE
Select CCOUPLE so the low-frequency cutoff due to the
load resistors and coupling capacitors is much lower than
the low-frequency cutoff of the MAX3657. The coupling
capacitor should be 0.1µF or larger, but 1.0µF is recommended for lowest jitter. Refer to Maxim Application Note
HFAN-1.1: Choosing AC-Coupling Capacitors for more
information.
Layout Considerations
Figure 3 shows a suggested layout for a TO header for
the MAX3657.
Wire Bonding
For high-current density and reliable operation, the
MAX3657 uses gold metalization. For best results, use
gold-wire ball-bonding techniques. Use caution if
attempting wedge bonding. Die size is 41 mils x 48 mils,
(1040µm x 1220µm) and die thickness is 15 mils (380µm).
The bond pad is 94.4µm x 94.4µm and its metal thickness
is 1.2µm. Refer to Maxim Application Note HFAN- 8.0.1:
_______________________________________________________________________________________
7
MAX3657
155Mbps Low-Noise Transimpedance
Amplifier
CASE
CFILT
CVCC
4-PIN TO HEADER
FILT
IN
VCC
Z
VCC
MO
N
GN
DZ
GN
D
OU
T+
OU
T-
PHOTODIODE
MAX3657 E/D
MOUNTED ON CFILT
OUTPUT POLARITIES
REVERSED FOR MAX3657BE/E
CASE IS GROUND
CASE
CFILT
CVCC
5-PIN TO HEADER
FILT
IN MON
VCCZ
VCC
GNDZ
GND
OUT+
OUT-
PHOTODIODE
MAX3657 E/D
MOUNTED ON CFILT
OUTPUT POLARITIES
REVERSED FOR MAX3657BE/E
CASE IS GROUND
Figure 3. Suggested TO Header Layout
8
_______________________________________________________________________________________
155Mbps Low-Noise Transimpedance
Amplifier
Table 1. Optical Power Relations*
PARAMETER
SYMBOL
RELATION
Applications Information
Average power
PAVG
Optical Power Relations
Extinction ratio
re
re = P1/P0
Optical power
of a 1
P1
re r
e
P1
P
1 ==2P2AVG
PAVG
re + 1
re + 1
Optical power
of a 0
P0
P0 = 2PAVG/(re + 1)
PIN
PIN = P1 − P0 =
re
2PAVG
re + 1
Many of the MAX3657 specifications relate to the inputsignal amplitude. When working with optical receivers,
the input is sometimes expressed in terms of average
optical power and extinction ratio. Figure 4 and Table 1
show relations that are helpful for converting optical
power to input signal when designing with the MAX3657.
 12.7 x in x (re + 1)

Sensitivity = 10log 
x 1000 dBm
 2 x ρ x (re − 1)

Optical modulation
amplitude
PAVG = (P0 + P1)/2
r −1
PIN = P1 − P0 = 2PAVG e
re + 1
Optical Sensitivity Calculation
The input-referred RMS noise current (i n ) of the
MAX3657 generally determines the receiver sensitivity.
To obtain a system bit-error rate (BER) of 1E-10, the
signal-to-noise ratio must always exceed 12.7. The
input sensitivity, expressed in average power, can be
estimated as:
MAX3657
Understanding Bonding Coordinates and Physical Die
Size for more information on bond-pad coordinates.
*Assuming a 50% average mark density.
Actual results may vary depending on supply noise, output filter, limiting amplifier sensitivity, and other factors
(refer to Maxim Application Note HFAN-3.0.0: Accurately
Estimating Optical Receiver Sensitivity).
Input Optical Overload
where ρ is the photodiode responsivity in A/W and in is
the RMS noise current in amps. For example, with photodiode responsivity of 0.9A/W, an extinction ratio of 10
and 15nA input-referred noise, the sensitivity of the
MAX3657 is:
 12.7 x 15nA x 11

Sensitivity = 10log 
x 1000 dBm = − 38dBm
 2 x 0.9A / W x 9

Overload is the largest input the MAX3657 accepts
while meeting the pulse-width distortion specification.
Optical overload can be estimated in terms of average
power with the following equation:
 2mA

Overload = 10log 
x 1000 dBm
x
2
ρ


For example, if photodiode responsivity is 1.0A/W, the
input overload is 0dBm.
Optical Linear Range
The MAX3657 has high gain, which limits the output for
large input signals. The MAX3657 operates in a linear
range for inputs not exceeding:
OPTICAL POWER
P1
 2µA (re + 1)

Linear Range = 10log 
x 1000 dBm
 2 x ρ (re − 1)

PAVG
For example, with photodiode responsivity of 0.9A/W
and an extinction ratio of 10 the linear range is:
P0
TIME
 2µA x 11

Linear Range = 10log 
x 1000 dBm = − 28dBm
 2 x 0.9 x 9

Figure 4. Optical Power Relations
_______________________________________________________________________________________
9
MAX3657
155Mbps Low-Noise Transimpedance
Amplifier
Interface Schematics
Equivalent Output Interface
The MAX3657 has a differential CML output structure
with 100Ω back termination (200Ω differentially). Figure
5 is a simplified diagram of the output interface. The
output current is divided between the internal 100Ω
resistor and the external load resistance. Because of
the CML structure, the maximum output-signal amplitude is affected by load impedance. Note that the internal back termination is 100Ω single ended and external
termination is recommended to interface the device to
50Ω test equipment. For example, if single-ended operation in a 50Ω system is required, first match the output
Pad Coordinates
Table 2 lists center-pad coordinates for the MAX3657
bond pads. Refer to Maxim Application Note HFAN8.0.1: Understanding Bonding Coordinates and
Physical Die Size for more information on bond-pad
coordinates.
Table 2. Bond-Pad Information
VCC
NAME
VCC
ROUT
100Ω
of the MAX3657 to the 50Ω controlled impedance by
placing a 100Ω pullup resistor in parallel with the output. Then establish similar loading conditions on the
unused output. Note that the loading conditions affect
the overall gain of the MAX3657. Figures 6a, 6b, and 6c
show alternate interface schemes for the MAX3657.
PAD
ROUT
100Ω
OUT+
VCC
OUT-
4.5mA
COORDINATES (µm)
MAX3657
MAX3657B
X
BP1
OUT-
OUT+
47.2
994.8
BP2
GND
GND
52.2
484.6
BP3
GNDZ
GNDZ
52.2
357.7
BP4
MON
MON
395.5
47.2
BP5
IN
IN
522.3
47.2
BP6
FILT
FILT
648.5
47.2
BP7
N.C.
N.C.
808.5
49.9
BP8
VCCZ
VCCZ
808.5
176.8
BP9
VCC
VCC
808.5
303.7
BP10
OUT+
OUT-
808.5
994.8
BP11
N.C.
N.C.
741.1
859.9
Figure 5. Equivalent Output Interface
10
Y
______________________________________________________________________________________
155Mbps Low-Noise Transimpedance
Amplifier
MAX3657
VCC
100Ω
100Ω
100Ω∗
100Ω∗
50Ω
50Ω
50Ω∗
50Ω∗
L
DIFFERENTIAL CML
INPUT STAGE
MAX3657
CML OUTPUT
STAGE
*COMPONENT NOT REQUIRED IF L < 10cm.
Figure 6a. 50Ω DC-Coupled Interface
VCC
100Ω∗
100Ω
50Ω
100Ω∗
100Ω
50Ω
50Ω∗
L
SINGLE-ENDED
INPUT STAGE
MAX3657
CML OUTPUT
STAGE
NOTE: THE PARALLEL COMBINATION AT THE UNUSED OUTPUT
CAN BE REPLACED BY A SINGLE EQUIVALENT 33Ω RESISTOR.
*COMPONENT NOT REQUIRED IF L < 10cm.
Figure 6b. 50Ω DC-Coupled Single-Ended Output Interface
______________________________________________________________________________________
11
MAX3657
155Mbps Low-Noise Transimpedance
Amplifier
VCC
100Ω∗
100Ω
100Ω∗
100Ω
50Ω
50Ω∗
L
50Ω
50Ω LOAD TO
GROUND
MAX3657
CML OUTPUT
STAGE
*COMPONENT NOT REQUIRED IF L < 10cm
Figure 6c. 50Ω AC-Coupled Single-Ended Output Interface
VCC
VCC
800Ω
FILT
Figure 7. FILT Interface
12
MON
Figure 8. MON Interface
______________________________________________________________________________________
155Mbps Low-Noise Transimpedance
Amplifier
Topography for MAX3657
TOP VIEW
OUT-
1
10
11
GND
2
GNDZ
3
OUT+
N.C.
0.048in
1.219mm
9
VCC
8
VCCZ
N.C.
1
GND
2
GNDZ
3
OUT-
N.C.
OUT+
12
11
10
MAX3657
4
5
6
MON
IN
FILT
9
N.C.
8
VCC
7
VCCZ
QFN
*EXPOSED PAD IS CONNECTED TO GND.
4
5
6
7
MON
IN
FILT
N.C.
0.041in
1.041mm
Chip Information
Topography for MAX3657B
OUT+
1
10
11
GND
2
GNDZ
3
OUT-
TRANSISTOR COUNT: 417
PROCESS: Silicon bipolar
SUBSTRATE: Connected to GND
DIE SIZE: 1.04mm x 1.22mm
N.C.
0.048in
1.219mm
9
VCC
8
VCCZ
4
5
6
7
MON
IN
FILT
N.C.
0.041in
1.041mm
______________________________________________________________________________________
13
MAX3657
Pin Configuration
Chip Topographies
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.
12x16L QFN THIN.EPS
MAX3657
155Mbps Low-Noise Transimpedance
Amplifier
D2
0.10 M C A B
b
D
D2/2
D/2
E/2
E2/2
CL
(NE - 1) X e
E
E2
L
e
CL
k
(ND - 1) X e
CL
0.10 C
CL
0.08 C
A
A2
A1
L
L
e
e
PACKAGE OUTLINE
12, 16L, THIN QFN, 3x3x0.8mm
21-0136
14
______________________________________________________________________________________
E
1
2
155Mbps Low-Noise Transimpedance
Amplifier
EXPOSED PAD VARIATIONS
DOWN
BONDS
ALLOWED
NOTES:
1. DIMENSIONING & TOLERANCING CONFORM TO ASME Y14.5M-1994.
2. ALL DIMENSIONS ARE IN MILLIMETERS. ANGLES ARE IN DEGREES.
3. N IS THE TOTAL NUMBER OF TERMINALS.
4. THE TERMINAL #1 IDENTIFIER AND TERMINAL NUMBERING CONVENTION SHALL CONFORM TO
JESD 95-1 SPP-012. DETAILS OF TERMINAL #1 IDENTIFIER ARE OPTIONAL, BUT MUST BE LOCATED
WITHIN THE ZONE INDICATED. THE TERMINAL #1 IDENTIFIER MAY BE EITHER A MOLD OR
MARKED FEATURE.
5. DIMENSION b APPLIES TO METALLIZED TERMINAL AND IS MEASURED BETWEEN 0.20 mm AND 0.25 mm
FROM TERMINAL TIP.
6. ND AND NE REFER TO THE NUMBER OF TERMINALS ON EACH D AND E SIDE RESPECTIVELY.
7. DEPOPULATION IS POSSIBLE IN A SYMMETRICAL FASHION.
8. COPLANARITY APPLIES TO THE EXPOSED HEAT SINK SLUG AS WELL AS THE TERMINALS.
9. DRAWING CONFORMS TO JEDEC MO220 REVISION C.
PACKAGE OUTLINE
12, 16L, THIN QFN, 3x3x0.8mm
21-0136
E
2
2
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 15
© 2004 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
MAX3657
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.