MAX40658/MAX40659 - Transimpedance

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MAX40658/MAX40659 - Transimpedance | Manualzz

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

Ordering Information

appears at end of data sheet.

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

Typical Application

Circuits

). 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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