MAX3657_V01 [MAXIM]
155Mbps Low-Noise Transimpedance Amplifier;
| 型号： | MAX3657_V01 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | 155Mbps Low-Noise Transimpedance Amplifier |
| 文件： | 总15页 (文件大小：755K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-2834; Rev 3; 11/05
155Mbps Low-Noise Transimpedance
Amplifier
MAX3657
General Description
Features
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).
♦ 14nA
Input-Referred Noise
RMS
♦ 54kΩ Transimpedance Gain
♦ 130MHz (typ) Bandwidth
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.
♦ 2mA
Input Current—0dBm Overload Capability
P-P
♦ 76mW (typ) Power Dissipation
♦ 3.3V Single-Supply Operation
♦ Average Photocurrent Monitor
Ordering Information
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.
PART
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
12 Thin QFN
Die*
MAX3657ETC
MAX3657E/D
MAX3657BE/D
Die*
*Dice are designed to operate over a -40°C to +110°C junction
temperature (T ) range, but are tested and guaranteed at T
+25°C.
=
J
A
Applications
Optical Receivers (Up to 155Mbps Operation)
Passive Optical Networks (PONs)
SFP/SFF Transceivers
Pin Configuration appears at end of data sheet.
BiDi Transceivers
Typical Application Circuit
3.3V
C
C
VCC1
VCC2
V
V
CC
CCZ
R
FILT
FILT
IN
1μF
C
FILT
OUT+
OUT-
MAX3964
R
LOAD
200Ω
C
OUT
LIMITING AMPLIFIER
1μF
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
ABSOLUTE MAXIMUM RATINGS
Power-Supply Voltage...........................................-0.5V to +6.0V
Input Continuous Current ................................................ 3.5mA
Operating Temperature Range
12-Pin TQFN ....................................................-40°C to +85°C
Operating Junction Temperature Range
Voltage at OUT+, OUT-...................(V
- 1.5V) to (V
+ 0.5V)
CC
CC
Voltage at FILT, MON.................................-0.5V to (V + 0.5V)
Continuous Power Dissipation
12-Pin TQFN (derate 14.7mW/°C above +70°C) .......1176mW
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
CC
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.
MAX3657
DC ELECTRICAL CHARACTERISTICS
(V
CC1
= +2.97V to +3.63V, 200Ω load between OUT+ and OUT-, T = -40°C to +85°C. Typical values are at V
= +3.3V, T = +25°C,
CC A
A
unless otherwise noted.) (Note 1)
PARAMETER
Supply Current
SYMBOL
CONDITIONS
MIN
TYP
23
1
MAX
34
UNITS
mA
I
CC
Input Bias Voltage
V
I
≤ 1mA
IN
1.3
V
IN
0.95 < linearity < 1.05, referred to gain at
1µA input
Transimpedance Linear Range
Small-Signal Transimpedance
Output Common-Mode Voltage
2
µA
P-P
P-P
Z
Differential output, I < 200nA
IN
44
54
65
kΩ
21
P-P
V
-
CC
0.225
AC-coupled outputs
V
Output Resistance (Per Side)
Maximum Differential Output Voltage
Filter Resistor
R
Single-ended output resistance
= 2mA = (V +) - (V
82
170
640
1
100
250
800
1.5
1
118
450
960
Ω
OUT
V
I
V
-)
OUT
mV
P-P
OUT(max) IN
P-P, OUT
OUT
R
Ω
FILT
DC Input Overload
mA
A/A
Monitor Nominal Gain
G
V
= +3.3V, +25°C (Note 2)
CC
0.8
-1.5
-1.5
-3.0
-4.0
1.2
NOM
I
= 100µA to 1mA
+1.5
+2.2
+2.7
+3.4
IN
Die
I
= 5µA
Monitor Gain Stability
(Note 3)
IN
ΔG
TQFN package
Die only
dB
I
I
= 2µA
= 1µA
IN
IN
Die only
2.0
AC ELECTRICAL CHARACTERISTICS
(V
CC
= +2.97V to +3.63V, 200Ω load between OUT+ and OUT-, C = 0.5pF, C
= 400pF, C = 680pF, T = -40°C to +85°C.
VCC2 A
IN
FILT
Typical values are at V
= +3.3V, T = +25°C, unless otherwise noted.) (Note 1)
CC
A
PARAMETER
Small-Signal Bandwidth
Low-Frequency Cutoff
AC Overload
SYMBOL
BW
CONDITIONS
Relative to gain at 1MHz
-3dB, I = 1µA
MIN
TYP
5
MAX
UNITS
MHz
kHz
110
-3dB
25
IN
2
mA
P-P
P-P
Pulse-Width Distortion
PWD
300nA
≤ I ≤ 2mA
IN P-P
22
ps
P-P
f = 100MHz (Note 4)
f = 117MHz
15
Input-Referred Noise Current
I
nA
RMS
n
14
1.3
5
RMS Noise Density
Monitor Bandwidth
f = 100MHz
pA/√Hz
I
IN
= 1µA
kHz
2
_______________________________________________________________________________________
155Mbps Low-Noise Transimpedance
Amplifier
MAX3657
AC ELECTRICAL CHARACTERISTICS (12-PIN TQFN)
(V
CC
= +2.97V to +3.63V, R
= 200Ω, C = 1.0pF, C
= 1000pF, C
= 0.01µF, T = -40°C to +85°C. Typical values are at
VCC2 A
LOAD
IN
FILT
V
CC
= +3.3V, T = +25°C, unless otherwise noted.) (Note 1)
A
PARAMETER
SYMBOL
BW
CONDITIONS
Relative to gain at 1MHz
-3dB, I = 1µA
MIN
TYP
95
5
MAX
UNITS
MHz
kHz
Small-Signal Bandwidth
Low-Frequency Cutoff
AC Overload
-3dB
25
IN
ε ≥ 10
r
1.6
mA
Pulse-Width Distortion
PWD
1µA
≤ I ≤ 2mA
22
5
ps
P-P
P-P
IN
P-P
f = 50MHz (Note 4)
f = 100MHz
Input-Referred Noise Current
RMS Noise Density
I
nA
RMS
n
13
1.3
f = 100MHz
pA/√Hz
Note 1: Die parameters are production tested at room temperature only, but are guaranteed by design from T = -40°C to +85°C.
A
AC characteristics guaranteed by design and characterization.
Note 2: G
= I
(1mA) / 1mA.
NOM
MON
Note 3: Stability is relative to the nominal gain at V = +3.3V, T = +25°C. ΔG(I ) dB = 10 log [ I
(I ) ] / [ I
(1mA) - G
MON NOM
A
CC
IN
10 MON IN
x (1mA - I )], V
Note 4: Total noise integrated from 0 to f.
≤ 2.1V, Input t , t > 550ps (20% to 80%).
r f
IN
MON
Typical Operating Characteristics
(MAX3657E/D. V
= 3.3V, C = 0.5pF, T = +25°C, unless otherwise noted.)
IN A
CC
SMALL-SIGNAL TRANSIMPEDANCE
vs. TEMPERATURE
SUPPLY CURRENT
vs. TEMPERATURE
INPUT BIAS VOLTAGE
vs. TEMPERATURE
60
55
50
45
100
90
80
70
60
50
40
30
20
10
0
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.2μA
P-P
1.0μA
P-P
40
35
-40
-20
0
20
40
60
80
-40
-20
0
20
40
60
80
-40
-20
0
20
40
60
80
°
°
°
AMBIENT TEMPERATURE ( C)
AMBIENT TEMPERATURE ( C)
AMBIENT TEMPERATURE ( C)
_______________________________________________________________________________________
3
155Mbps Low-Noise Transimpedance
Amplifier
Typical Operating Characteristics (continued)
(MAX3657E/D. V
= 3.3V, C = 0.5pF, T = +25°C, unless otherwise noted.)
IN A
CC
PULSE-WIDTH DISTORTION
DIFFERENTIAL OUTPUT VOLTAGE
vs. INPUT CURRENT AMPLITUDE
vs. INPUT CURRENT
FREQUENCY RESPONSE
400
300
200
100
0
100
90
80
70
60
50
40
30
20
10
0
98
R
Z
= OPEN
LOAD
= 108kΩ
21
95
92
R
Z
= 200Ω
LOAD
= 54kΩ
MAX3657
21
DIFFERENTIAL OUTPUT
SINGLE-ENDED OUTPUT
89
86
83
80
R
= 100Ω
LOAD
= 36kΩ
-40°C
Z
21
-100
-200
-300
-400
+85°C
+25°C
V
FILT
= GND
1k
10k 100k 1M 10M 100M
FREQUENCY (Hz)
0.1
1
10
100
1000
10,000
-20 -15 -10 -5
INPUT CURRENT (μA)
0
5
10 15
20
100
1G
INPUT SIGNAL AMPLITUDE (μA)
INPUT-REFERRED RMS NOISE
vs. CAPACITANCE
INPUT-REFERRED RMS NOISE
vs. DC INPUT CURRENT
BANDWIDTH vs. CAPACITANCE
35
275
250
225
200
175
150
125
100
75
1.2
T = +110°C
J
30
25
1.0
0.8
T = +25°C
J
T = -40°C
J
T = -40°C
J
T = +25°C
J
T = -40°C
J
T = +110°C
J
20
15
10
0
0.6
0.4
0.2
0
T = +25°C
J
T = +110°C
J
50
25
0
0.1 0.3 0.5 0.7 0.9 1.1 1.3 1.5
CAPACITANCE (pF)
0.2
0.4
0.6
0.8
1.0
1.2
1.4
0.1
1
10
100
1000
10,000
CAPACITANCE (pF)
DC CURRENT IN (μA)
OUTPUT EYE DIAGRAM
(100μA ELECTRICAL INPUT)
OUTPUT EYE DIAGRAM
(1.0μA ELECTRICAL INPUT)
OUTPUT EYE DIAGRAM
(1mA ELECTRICAL INPUT)
MAX3657 toc11
MAX3657 toc10
MAX3657 toc12
200mV
40mV
50mV
10mV
200mV
40mV
-200mV
-50mV
-200mV
1ns/div
1ns/div
1ns/div
4
_______________________________________________________________________________________
155Mbps Low-Noise Transimpedance
Amplifier
MAX3657
Typical Operating Characteristics (continued)
(MAX3657E/D. V
= 3.3V, C = 0.5pF, T = +25°C, unless otherwise noted.)
IN A
CC
OUTPUT EYE DIAGRAM
(-30dBm OPTICAL INPUT)
OUTPUT EYE DIAGRAM
(-1dBm OPTICAL INPUT)
INPUT IMPEDANCE vs. FREQUENCY
800
750
700
650
600
550
500
450
400
350
300
T = +25°C
T = -40°C
J
J
6mV/div
23-1
23-1
2
PRBS
2
PRBS
T = +110°C
J
20mV/div
SMALL SIGNAL
ZARLINK 1A358 PHOTODIODE + MAX3657
1ns/div
ZARLINK 1A358 PHOTODIODE + MAX3657
1ns/div
1k
10k 100k 1M 10M 100M 1G
FREQUENCY (Hz)
100
Pin Description
PIN
NAME
N.C.
FUNCTION
1, 9, 11
No Connection. Do not connect.
2
3
GND Negative Supply Voltage. Both GND and GNDZ must be connected to ground.
GNDZ 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.
4
5
MON
IN
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 ; an external decoupling capacitor connected to this pin forms a filter (see the Design
CCZ
6
FILT
Procedure section).
7
8
V
Power-Supply Voltage. Both V
Power-Supply Voltage. Both V
and V
and V
must be connected to the supply.
must be connected to the supply.
CCZ
CC
CC
CCZ
CCZ
V
CC
10
12
OUT+ Positive Data Output. This output has 100Ω back termination, increasing input current causes OUT+ to increase.
OUT- Negative Data Output. This output has 100Ω back termination, increasing input current causes OUT- to decrease.
_______________________________________________________________________________________
5
155Mbps Low-Noise Transimpedance
Amplifier
Functional Diagram
MAX3657
TRANSIMPEDANCE
AMPLIFIER
VOLTAGE
AMPLIFIER
OUTPUT
BUFFER
R
F
R
R
OUT
IN
OUT+
OUT-
MAX3657
OUT
+1.0V
DC-CANCELLATION
CIRCUIT
LOWPASS
FILTER
MON
V
CCZ
R
OUT
ENABLE
FILT
do not drive a DC-coupled grounded load. The outputs
Detailed Description
should be AC-coupled or terminated to V . If a single-
CC
The MAX3657 transimpedance amplifier is designed for
155Mbps fiber-optic applications. The functional dia-
gram of the MAX3657 comprises a transimpedance
amplifier, a voltage amplifier, a DC-cancellation circuit,
and a CML output buffer.
ended 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 feed-
back 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.
Transimpedance Amplifier
The signal current at the input flows into the summing
node of a high-gain amplifier. Shunt feedback through
resistor R converts this current into a voltage. Schottky
F
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 signifi-
cantly different from 50% causes the MAX3657 to gen-
erate pulse-width distortion. Grounding the FILT pin
disables the DC-cancellation circuit. For normal opera-
tion, the DC-cancellation circuit must be enabled.
diodes clamp the output signal for large input currents
(Figure 1).
Voltage Amplifier
The voltage amplifier provides additional gain and con-
verts the transimpedance amplifier single-ended output
signal into a differential signal.
Output Buffer
The output buffer provides a reverse-terminated volt-
age output and is designed to drive a 200Ω differential
load between OUT+ and OUT-. For optimum supply-
noise rejection, the MAX3657 should be terminated with
a differential load. The MAX3657 single-ended outputs
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).
6
_______________________________________________________________________________________
155Mbps Low-Noise Transimpedance
Amplifier
MAX3657
AMPLITUDE
AMPLITUDE
INPUT FROM PHOTODIODE
TIME
TIME
OUTPUT (SMALL SIGNALS)
OUTPUT (LARGE SIGNALS)
INPUT AFTER DC CANCELLATION
Figure 1. MAX3657 Limited Outputs
Figure 2. Effects of DC Cancellation on Input
Photocurrent Monitor
The MAX3657 includes an average photocurrent monitor.
The current at MON is approximately equal to the DC cur-
rent at IN. Best monitor accuracy is obtained when data
input edge time is longer than 500ps.
Select R
MON
Connect a resistor between MON and ground to moni-
tor the average photocurrent. Select R
possible:
as large as
MON
2.1V
R
=
Design Procedure
MON
I
MONMAX
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.
where I
is the largest average input current
MONMAX
observed.
Select Coupling Capacitors
A receiver built with the MAX3657 has a bandpass fre-
quency response. The low-frequency cutoff due to the
coupling capacitors and load resistors is:
1
LFCTERM
=
2π x RLOAD x CCOUPLE
Select C
FILT
Supply voltage noise at the cathode of the photodiode
produces a current I = C
ΔV/Δt, which reduces the
Select C
so the low-frequency cutoff due to the
PD
COUPLE
receiver sensitivity (C
is the photodiode capaci-
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 recom-
mended for lowest jitter. Refer to Maxim Application Note
HFAN-01.1: Choosing AC-Coupling Capacitors for more
information.
PD
tance). The filter resistor of the MAX3657, combined
with an external capacitor, can be used to reduce the
noise (see the Typical Application Circuit). Current gen-
erated by supply-noise voltage is divided between
C
and C . To obtain a good optical sensitivity,
PD
FILT
FILT
select C
> 400pF.
Layout Considerations
Figure 3 shows a suggested layout for a TO header for
the MAX3657.
Select Supply Filter
The MAX3657 requires wideband power-supply decou-
pling. Power-supply bypassing should provide low
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- 08.0.1:
impedance between V
and ground for frequencies
CC
between 10kHz and 200MHz. Use LC filtering at the
main supply terminal and decoupling capacitors as
close to the die as possible.
_______________________________________________________________________________________
7
155Mbps Low-Noise Transimpedance
Amplifier
V
CC
C
VCC
PHOTODIODE
MAX3657
C
FILT
4-PIN TO HEADER
FILT IN MON
VCCZ
OUT+
OUT-
VCC
GNDZ
GND
OUTPUT POLARITIES
OUT+ OUT-
REVERSED FOR MAX3567BE/D.
CASE IS GROUND.
MAX3657E/D
GND
PHOTODIODE
C
FILT
V
MON
CC
5-PIN TO HEADER
C
VCC
OUT+
OUT-
FILT IN MON
VCCZ
VCC
GNDZ
GND
OUTPUT POLARITIES
OUT+ OUT-
REVERSED FOR MAX3567BE/D.
CASE IS GROUND.
MAX3657E/D
Figure 3. Suggested TO Header Layout
8
_______________________________________________________________________________________
155Mbps Low-Noise Transimpedance
Amplifier
MAX3657
Understanding Bonding Coordinates and Physical Die
Table 1. Optical Power Relations*
Size for more information on bond-pad coordinates.
PARAMETER
Average power
Extinction ratio
SYMBOL
RELATION
Applications Information
P
P
= (P0 + P1)/2
AVG
AVG
r
r = P1/P0
e
Optical Power Relations
Many of the MAX3657 specifications relate to the input-
signal 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.
e
r
e
+ 1
Optical power
of a 1
P1 = 2P
AVG
P1
P0
r
e
Optical power
of a 0
P0 = 2P
/(r + 1)
e
AVG
IN
P= P1 − P0 =
Optical Sensitivity Calculation
The input-referred RMS noise current (i ) of the
n
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:
Optical modulation
amplitude
r
e
+ 1
P
IN
2P
AVG
r
e
*Assuming a 50% average mark density.
Actual results may vary depending on supply noise, out-
put filter, limiting amplifier sensitivity, and other factors
(refer to Maxim Application Note HFAN-03.0.0: Accurately
Estimating Optical Receiver Sensitivity).
⎛
⎞
12.7 x i x (r + 1)
n
e
Sensitivity = 10log
x 1000 dBm
⎜
⎟
2 x ρ x (r − 1)
⎝
⎠
e
Input Optical Overload
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:
where ρ is the photodiode responsivity in A/W and i is
n
the RMS noise current in amps. For example, with pho-
todiode responsivity of 0.9A/W, an extinction ratio of 10
and 15nA input-referred noise, the sensitivity of the
MAX3657 is:
⎛
⎞
2mA
2 x ρ
Overload = 10log
x 1000 dBm
⎛
⎞
12.7 x 15nA x 11
2 x 0.9A/W x 9
⎜
⎟
Sensitivity = 10log
x 1000 dBm = − 38dBm
⎝
⎠
⎜
⎟
⎝
⎠
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:
P1
⎛
⎞
2μA (r + 1)
e
Linear Range = 10log
x 1000 dBm
⎜
⎟
2 x ρ (r − 1)
⎝
⎠
e
P
AVG
P0
For example, with photodiode responsivity of 0.9A/W
and an extinction ratio of 10 the linear range is:
⎛
⎞
2μA x 11
2 x 0.9 x 9
Linear Range = 10log
x 1000 dBm = − 28dBm
⎜
⎟
⎝
⎠
TIME
Figure 4. Optical Power Relations
_______________________________________________________________________________________
9
155Mbps Low-Noise Transimpedance
Amplifier
of the MAX3657 to the 50Ω controlled impedance by
Interface Schematics
placing a 100Ω pullup resistor in parallel with the out-
put. 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.
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 ampli-
tude is affected by load impedance. Note that the inter-
nal back termination is 100Ω single ended and external
termination is recommended to interface the device to
50Ω test equipment. For example, if single-ended oper-
ation 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 HFAN-
08.0.1: Understanding Bonding Coordinates and
Physical Die Size for more information on bond-pad
coordinates.
MAX3657
Table 2. Bond-Pad Information
V
CC
NAME
COORDINATES (µm)
V
CC
PAD
R
OUT
R
OUT
100Ω
MAX3657
MAX3657B
OUT+
GND
X
Y
100Ω
OUT-
GND
GNDZ
MON
IN
BP1
BP2
BP3
BP4
BP5
BP6
BP7
BP8
BP9
BP10
BP11
47.2
994.8
484.6
357.7
47.2
OUT+
CC
52.2
V
GNDZ
MON
IN
52.2
395.5
522.3
648.5
808.5
808.5
808.5
808.5
741.1
OUT-
47.2
FILT
N.C.
FILT
47.2
N.C.
49.9
V
V
176.8
303.7
994.8
859.9
CCZ
CCZ
V
V
CC
CC
OUT+
N.C.
OUT-
N.C.
4.5mA
Figure 5. Equivalent Output Interface
10 ______________________________________________________________________________________
155Mbps Low-Noise Transimpedance
Amplifier
MAX3657
V
CC
100Ω∗
100Ω∗
50Ω
50Ω
100Ω
100Ω
50Ω∗
50Ω∗
L
DIFFERENTIAL CML
INPUT STAGE
MAX3657
CML OUTPUT
STAGE
*COMPONENT NOT REQUIRED IF L < 10cm.
Figure 6a. 50Ω DC-Coupled Interface
V
CC
100Ω∗
50Ω
100Ω∗
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
155Mbps Low-Noise Transimpedance
Amplifier
V
CC
100Ω∗
100Ω∗
100Ω
100Ω
50Ω
MAX3657
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
V
CC
V
CC
800Ω
FILT
MON
Figure 8. MON Interface
Figure 7. FILT Interface
12 ______________________________________________________________________________________
155Mbps Low-Noise Transimpedance
Amplifier
MAX3657
Pin Configuration
Chip Topographies
Topography for MAX3657
N.C.
9
V
V
CC
CCZ
TOP VIEW
8
7
OUT-
OUT+
N.C.
1
10
11
OUT+ 10
N.C. 11
OUT- 12
6
5
4
FILT
IN
MAX3657
0.048in
1.219mm
MON
GND
2
3
GNDZ
1
2
3
9
8
7
V
V
CC
N.C.
GND GNDZ
CCZ
TQFN
*EXPOSED PAD IS CONNECTED TO GND.
4
5
6
MON
IN
FILT
N.C.
0.041in
1.041mm
Chip Information
TRANSISTOR COUNT: 417
PROCESS: Silicon bipolar
Topography for MAX3657B
SUBSTRATE: Connected to GND
DIE SIZE: 1.04mm x 1.22mm
OUT+
OUT-
N.C.
1
10
11
0.048in
1.219mm
GND
2
3
GNDZ
9
8
7
V
V
CC
CCZ
4
5
6
MON
IN
FILT
N.C.
0.041in
1.041mm
______________________________________________________________________________________ 13
155Mbps Low-Noise Transimpedance
Amplifier
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.
MAX3657
14 ______________________________________________________________________________________
155Mbps Low-Noise Transimpedance
Amplifier
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.
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
© 2005 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products, Inc.
相关型号：
MAX3658AETA+T
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MAXIM
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