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MAX40658/MAX40659
EVALUATION KIT AVAILABLE
Transimpedance Amplifier with 100mA Input
Current Clamp for LiDAR Applications
General Description
The MAX40658 and MAX40659 are transimpedance amplifiers for optical distance measurement receivers for LiDAR applications. Low noise, high gain, low group delay, and fast recovery from overload make these parts ideal for distance-measurement applications.
Important features include 45nA
RMS
input-referred noise, an internal 100mA clamp, 18kΩ (MAX40658) and 36kΩ
(MAX40659) transimpedance, and greater than 360MHz bandwidth. An offset input allows adjustment of input offset current. Operating from a +3.3V supply, the MAX40658 and MAX40659 consume only 70mW.
The MAX40658 and MAX40659 are available in a 3mm x
3mm, 8-pin TDFN package or bare die, and are specified over the -40°C to 85°C operating temperature range.
Applications
● Optical Distance Measurement
● LIDAR Receivers
● Industrial Safety Systems
● Autonomous Driving Systems
Benefits and Features
● 45nA
RMS
Noise
● Two Transimpedance Values Available
• 18kΩ (MAX40658)
• 36kΩ (MAX40659)
● 360MHz Minimum Bandwidth
● Internal Clamp For Input Current Up To 100mA
● Offset Adjust Input
● 70mW Power Dissipation
● 3.3V Operation
Simplified Block Diagram
IN
V
CC
GAIN STAGE 1
12.8kΩ
GAIN STAGE 2 x1.4 or x2.8
(150Ω load)
CCAP
VBIAS
OUT+
OUT-
27Ω
CLAMP
BIAS
3.2kΩ
OFFSET GND
19-100082; Rev 0; 6/17
MAX40658/MAX40659 Transimpedance Amplifier with 100mA Input
Current Clamp for LiDAR Applications
Absolute Maximum Ratings
Supply Voltage .....................................................-0.5V to +4.2V
Current Into IN ................................................................+100mA
Voltage at OUT+, OUT- ......................V
CC
- 1.2V to V
CC
+ 0.5V
Voltage at CCAP ....................................................-0.3V to 1.2V
Continuous Power Dissipation (T
A
= +85°C, derate 24.4mW/°C above +85°C.) ..........................1904.8mW
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
Soldering Temperature (reflow) .......................................+260°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.
Package Information
8-TDFN
PACKAGE CODE
Outline Number
Land Pattern Number
Thermal Resistance, Single-Layer Board:
Junction to Ambient (θ
JA
)
Junction to Case (θ
JC
)
Thermal Resistance, Four-Layer Board:
Junction to Ambient (θ
JA
)
Junction to Case (θ
JC
)
21-0137
90-0059
55
8
42
8
T833+1F
For the latest package outline information and land patterns (footprints), go to
www.maximintegrated.com/packages
. Note that a “+”,
“#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status.
Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board.
For detailed information on package thermal considerations, refer to
www.maximintegrated.com/thermal-tutorial
.
www.maximintegrated.com
Maxim Integrated │
2
MAX40658/MAX40659 Transimpedance Amplifier with 100mA Input
Current Clamp for LiDAR Applications
Electrical Characteristics
(V
CC
= +2.97V to +3.63V, 150Ω AC-coupled load between OUT+ and OUT-, T
A
= -40°C to +85°C, C
IN
= 0.25pF (Note 1))
PARAMETER
Power Supply Current
Input Bias Voltage
SYMBOL
I
CC
V
IN
CONDITIONS MIN TYP
21
0.78
MAX UNITS
30 mA
1.0
V
Transimpedance Linearity
Small-Signal Transimpedance
(Note 2)
Small-Signal Transimpedance
OFFSET Input Transimpedance
Input Clamping Current
Output Common-Mode Voltage
Z
21
Z
21
I
IN
= 1µA
I
MAX40658 I
IN
OFFSET
= I
INCENTER
= 0, Note 2
±2µA,
MAX40658, I
IN
< 2µA
P-P
MAX40659, I
IN
< 1µA
P-P
MAX40658
MAX40659
MAX40658
MAX40659
15.7
60
18.3
36.4
4.7
9.4
100
V
CC
-
0.125
V
CC
0.25
-
-27
75
6
20.9
90
% kΩ kΩ kΩ mA
V mV
Ω
Differential Output Offset
Output Impedance
Maximum Differential Output
Voltage
V
ΔV
Z
OUT
OUT
OUT(MAX)
I
IN
= 0mA
Single ended
MAX40658, I
IN
V
OUT
= ±1mA
P-P
.
= V
OUT + P-P
- V
OUT - P-P
MAX40659, I
V
OUT
IN
= ±1mA
P-P
.
= V
OUT + P-P
- V
OUT - P-P
Input Resistance R
IN
Bandwidth
Input-Referred Noise
Input Noise Density
BW i n
MAX40658, V
CC
= 3.3V, Note 3
MAX40659, V
CC
BW = 267MHz
= 3.3V
f = 267MHz
Note 1: Limits are 100% production tested at T
A
Note 2: I
INCENTER
= +25°C.
is the input current that results in a differential output voltage of 0V.
Note 3: Not production tested, guaranteed by design and characterization.
150
360
240
480
450
520
520
45
2.1
400 mV
P-P
Ω
MHz nA
RMS pA/Hz 1/2 www.maximintegrated.com
Maxim Integrated │
3
24
23
SUPPLY CURRENT vs. SUPPLY VOLTAGE
toc01a
I
DC-IN
= 0 μA
T
A
= +85
°C
22
21
20
19
18
17
2.9
3.1
T
A
= +25
°C
T
A
= -40
°C
3.3
3.5
3.7
SUPPLY VOLTAGE (V)
3.9
4.1
0.838
0.836
0.834
0.832
0.83
0.828
0.826
0.824
-10
V
IN vs. INPUT CURRENT
toc02b
-5 0
INPUT CURRENT (
μA)
5 10
40
20
0
-20
-40
-60
100
80
60
-80
-100
-20
OFFSET ADJUSTMENT CURRENT INPUT vs. INPUT DC CURRENT
toc03c
V
(OUT+)-(OUT-)
= -50mV
V
(OUT+)-(OUT-)
= -25mV
V
(OUT+)-(OUT-)
= 0mV
V
(OUT+)-(OUT-)
= +25mV
V
(OUT+)-(OUT-)
= +50mV
-10 0
INPUT DC CURRENT( μ A)
10 20
MAX40658/MAX40659 Transimpedance Amplifier with 100mA Input
Current Clamp for LiDAR Applications
Typical Operating Characteristics
(V
CC
= +3.3V, C
IN
= 0.5pF, T
A
= +25°C, unless otherwise noted.)
25
24
SUPPLY CURRENT vs. INPUT DC CURRENT
toc01b
T
A
=+ 85
°C
T
A
= +55
°C
23
22
21
20
19
18
17
16
15
-20
T
A
= -40
°C
T
A
= -10
°C
-10 0
T
A
= +25
10
INPUT CURRENT (
μA)
°C
20
150
OUTPUT DIFFERENTIAL VOLTAGE vs. INPUT DC CURRENT
toc03a
I
DC-IN
= 0
μA
I
OFFSET
= 0
μA
100
50
I
OFFSET
= -10 μA
I
OFFSET
= -20
μA
0
I
OFFSET
= -30 μA
-50
I
OFFSET
=+10 μA
-100
I
OFFSET
= +20 μA
-150
-20
I
OFFSET
= +30
μA
-10 0
INPUT CURRENT (
μA)
10 20
200
150
100
OUTPUT DIFFERENTIAL VOLTAGE vs. INPUT CURRENT
toc04
T
A
= +85
°C
T
A
= +55 °C
50
0
-50
T
A
= -40
°C
T
A
= +25
°C
-100
-150
T
A
= -10
°C
-200
-20 -15 -10 -5 0 5 10 15 20
INPUT CURRENT ( μA)
V
CCAP vs. TEMPERATURE
980
960
940 toc02a
920
900
880
860
840
820
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90
TEMPERATURE (°C)
150
OUTPUT DIFFERENTIAL VOLTAGE vs. OFFSET ADJUSTMENT CURRENT INPUT
toc03B
I
DC-IN
= 0 μA
100
I
DC-IN
= +5
μA
50
I
DC-IN
= +10
μA
0
I
DC-IN
= -5
μA
-50
-100
I
DC-IN
= -10 μA
-150
-100 -50 0 50
OFFSET ADJUSTMENT CURRENT INPUT (
μA)
100
SMALL-SIGNAL TRANSIMPEDANCE vs. TEMPERATURE
toc05
19
18.8
18.6
18.4
18.2
18
17.8
17.6
17.4
17.2
17
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90
TEMPERATURE (°C) www.maximintegrated.com
Maxim Integrated │
4
MAX40658/MAX40659 Transimpedance Amplifier with 100mA Input
Current Clamp for LiDAR Applications
Typical Operating Characteristics (continued)
(V
CC
= +3.3V, C
IN
= 0.5pF, T
A
= +25°C, unless otherwise noted.)
20
18
16
14
12
10
8
6
4
2
0
-10
TRANSIMPEDANCE vs. INPUT CURRENT
toc06
-5 0
INPUT CURRENT (
μA)
5 10
75
70
65
60
1
FREQUENCY RESPONSE
90
C
IN
= 0.25pF
85
80
10 100
FREQUENCY (MHz)
1000 toc08a
600
-3dB BANDWIDTH vs. INPUT CAPACITANCE
toc09
500
400
300
200
100
0
0 1 2 3 4 5 6 7 8 9 10 11
INPUT CAPACITANCE (pF)
500
450
400
350
300
250
200
150
100
50
0
0.1
INPUT IMPEDANCE vs. FREQUENCY
toc07
1 10
FREQUENCY (MHz)
100 1000
75
70
65
60
0.1
FREQUENCY RESPONSE
90
C
IN
= 0.55pF
85
80
1 10
FREQUENCY (MHz)
100 toc08b
1000
550
540
530
-3dB BANDWIDTH vs. SUPPLY VOLTAGE
C
IN
= 0.25pF
toc10
520
510
500
490
480
T
A
T
A
= -40
= +25
°C
°C
T
A
= +85
°C
470
460
450
440
430
420
2.8 2.9
3 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8
SUPPLY VOLTAGE (V) www.maximintegrated.com
Maxim Integrated │
5
MAX40658/MAX40659 Transimpedance Amplifier with 100mA Input
Current Clamp for LiDAR Applications
Typical Operating Characteristics (continued)
(V
CC
= +3.3V, C
IN
= 0.5pF, T
A
= +25°C, unless otherwise noted.)
200
180
160
140
120
100
80
60
40
20
0
1
INTEGRATED INPUT CURRENT NOISE vs. FREQUENCY
toc11
C
IN
= 0.55pF
10 100
FREQUENCY (MHz)
1000
INPUT REFERRED RMS NOISE vs. INPUT DC CURRENT
90
80
70
60
50 toc13
40
30
20
10
0
0 1 2 3 4 5 6 7 8 9 10
INPUT DC CURRENT ( μA)
I
IN
V
DIFF_OUT
PULSE RESPONSE
toc15
100
μA/div
0
0
50mV/div
V
OUT+
V
OUT-
500ps/div 50 ΩSYSTEM
20mV/div
(AC -
COUPLED)
300
250
INPUT REFERRED RMS NOISE vs. INPUT CAPACITANCE
toc12
C
IN
I
IN
= 0nA
= 0.55pF
267MHz BANDWIDTH
200
150
100
50
0
0 1 2 3 4
INPUT CAPACITANCE (pF)
5 6
I
IN
7
μA/div
0
V
OUT+
V
OUT-
I
IN
PULSE RESPONSE
V
DIFF_OUT toc14
V
DIFF_OUT
15mV/div
0
500ps/div
50
ΩSYSTEM
10mV/div
(AC-
COUPLED)
I
IN
V
DIFF_OUT
PULSE RESPONSE
toc16
22mA/div
0
50mV/div
0
V
OUT+
V
OUT-
1ns/div 50 ΩSYSTEM
50mV/div
(AC-
COUPLED) www.maximintegrated.com
Maxim Integrated │
6
MAX40658/MAX40659 Transimpedance Amplifier with 100mA Input
Current Clamp for LiDAR Applications
Pin Configuration
TOP VIEW
VCC
IN
CCAP
OFFSET
3
4
1
2
MAX40658
MAX40659
8
7
6
5
GND
OUT-
OUT+
GND
*
TDFN
3mm x 3mm
*THE EXPOSED PAD MUST BE CONNECTED TO THE CIRCUIT BOARD
GROUND FOR PROPER THERMALAND ELECTRICAL PERFORMANCE.
Pin Description
PIN
1
2
3
NAME
VCC
IN
CCAP
4
6
7
5, 8, EP
OFFSET
OUT+
OUT-
GND
FUNCTION
+3.3V Supply Voltage
Signal Input. Connect to photodiode anode.
Capacitor connection for clamp bias.
Offset adjustment current input. Apply a current to this input to adjust the effective input offset current. A positive current into the pin produces a negative offset voltage at OUT+ pin.
Positive 75Ω Output. Increasing input current causes OUT+ to increase.
Negative 75Ω Output. Increasing input current causes OUT- to decrease.
Circuit Ground www.maximintegrated.com
Maxim Integrated │
7
MAX40658/MAX40659 Transimpedance Amplifier with 100mA Input
Current Clamp for LiDAR Applications
Detailed Description
The MAX40658 and MAX40659 transimpedance amplifiers are designed for optical distance measurement applications and are comprised of a transimpedance amplifier and a voltage amplifier/output buffer.
Gain Stage 1
The signal current at the input flows into the summing node of a high-gain transimpedance amplifier. Shunt feedback through the feedback resistor converts this current into a voltage. An internal Schottky diode clamps input currents up to 100mA (see the
). Bypass CCAP (internally connected to the cathode of the internal Schottky diode) with a 1µF capacitor. An external Schottky diode may be added for increased clamping current capability.
Gain Stage 2
The second gain stage provides additional gain and converts the transimpedance amplifier single-ended output into a differential signal. Two different versions are available (MAX40658 and MAX40659), each with a different voltage amplifier gain.
This stage is designed to drive a 150Ω differential load between OUT+ and OUT-. For optimum supply noise rejection, the outputs should be terminated with a differential load. The single-ended outputs do not drive a DC-coupled grounded load. The outputs should be
AC-coupled or terminated to V
CC
. If a single-ended output is required, both the used and unused outputs should be terminated in a similar manner.
Offset Adjustment
The OFFSET input accepts an input current that may be used to adjust the input offset current of the TIA. Current flowing into the pin yields a negative offset equivalent to I
OSIN
/4, where I
OSIN
is the current flowing into the
OFFSET pin. The OFFSET pin is biased to the same voltage as the IN pin.
Applications Information
Photodiode
Noise performance and bandwidth are adversely affected by capacitance on the TIA input node. Select a low- capacitance photodiode to minimize the total input capacitance on this pin. The TIA is optimized for 0.5pF of capacitance on the input. Assembling the TIA in die form using chip and wire technology provides the lowest capacitance input and the best possible performance.
Supply Filter
Sensitive optical receivers require wide-band power supply decoupling. Power supply bypassing should provide low impedance between V
CC
and ground for frequencies between 10kHz and 700MHz. Isolate the amplifier from noise sources with LC supply filters and shielding. Place a supply filter as close to the amplifier as possible.
www.maximintegrated.com
Maxim Integrated │
8
MAX40658/MAX40659 Transimpedance Amplifier with 100mA Input
Current Clamp for LiDAR Applications
Typical Application Circuits
DC-Coupled APD Receiver TIA Using 100mA Internal Clamp
VPD
VCC
GAIN STAGE 1
12.8k
Ω
GAIN STAGE 2 x1.4 or x2.8
(150
Ω load)
IN
CCAP
1
µF
VBIAS
27
Ω
CLAMP
BIAS
3.2k
Ω
OFFSET
IOSIN
GND
OUT +
OUT -
150
Ω
DC-Coupled APD Receiver TIA Using External Schottky Clamp For Higher Input Current Handling
VPD
VCC
GAIN STAGE 1
12.8k
Ω
GAIN STAGE 2 x1.4 or x2.8
(150
Ω load)
IN
1
µF
CCAP
VBIAS
27
Ω
CLAMP
BIAS
3.2k
Ω
OFFSET
IOSIN
GND
OUT +
OUT -
150
Ω www.maximintegrated.com
Maxim Integrated │
9
MAX40658/MAX40659 Transimpedance Amplifier with 100mA Input
Current Clamp for LiDAR Applications
Ordering Information
PART NUMBER
MAX40658ETA+
MAX40659ETA+**
MAX40658E/D**
MAX40659E/D**
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-
-
+Denotes a lead(Pb)-free/RoHS-compliant package
T Denotes tape-and-reel.
**Future product—Contact Maxim for availability.
PIN-PACKAGE
8-TDFN
8-TDFN
Dice*
Dice*
TOP MARKING
BSE
BSF
—
—
TRANSIMPEDANCE
18.3kΩ
36.6kΩ
18.3kΩ
36.6kΩ www.maximintegrated.com
Maxim Integrated │
10
MAX40658/MAX40659
Revision History
REVISION
NUMBER
0
REVISION
DATE
6/17 Initial release
Transimpedance Amplifier with 100mA Input
Current Clamp for LiDAR Applications
DESCRIPTION
PAGES
CHANGED
—
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
© 2017 Maxim Integrated Products, Inc. │ 11
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