MAX40660 Evaluation Kit Datasheet

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Evaluates: MAX40660

MAX40660 Evaluation Kit

General Description

The MAX40660 evaluation kit (EV kit) is a fully assembled

electrical demonstration kit that provides a proven design

to evaluate the MAX40660 trans-impedance amplifiers.

Note that the MAX40660 EV kit provides an electrical

interface to the IC that is similar, but not the same as a

photodiode.

The MAX40660 EV kit PCB comes with a MAX40660ATB/

VY+ installed.

Features

●Easy Electrical Evaluation of the MAX40660

● EV Kit Designed for 50Ω Interfaces

●-40°C to +125°C Temperature Range

●Tested 10-TDFN-EP MAX40660ATB/VY+ device

●Accommodates Easy-to-Use components

●Proven PCB Layout

●Fully Assembled and Tested

Ordering Information appears at end of data sheet.

319-100402; Rev 0; 5/19

MAX40660 EV Kit Photo

Click here for production status of specific part numbers.

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MAX40660 Evaluation Kit

Quick Start

Required Equipment

● +3.6V, 100mA DC Power Supply

● Signal Source Up to 1GHz

● 500MHz to 2.5GHz Oscilloscope

Procedure

The MAX40660 EV kit is fully assembled and tested.

Follow the below to verify board operation:

Caution: Do not turn on the power supply or the electronic

load until all the connections are complete.

1) Connect a +3.3V supply and ground to VIN_SUPPLY

connector and GND return pad of the EV kit, respectively.

Disable the output of the power supply.

2) Install a shunt on 2-3 of jumper J1 to enable the TIA.

(Installing a shunt on 1-2 of jumper J1 will force the

TIA into low-power disable mode.)

3) Install a shunt on 2-3 of jumper J2 to selects the low

gain mode (25kΩ transimpedance) (Installing a shunt

on 1-2 of jumper J2) selects the high gain mode (50kΩ

transimpedance)).

4) Connect a signal source to IN_AC (J4) edge-mount SMA

input. Set the signal amplitude to 12.5mVP-P

(4.4mVRMS

or -34dBm), which corresponds to 5μAP-P. Set the

frequency to 300MHz. Disable the signal generator

output.

5) Connect OUT1+ (J7) and OUT- (J6) edge-mount

SMA outputs to the 50Ω inputs of a high-speed

oscilloscope.

6) Verify all the shunts are in default positions, as shown

in Table 1.

7) Enable the power supply and signal generator

output. Observe for outputs from OUT+ and OUT- on

the oscilloscope.

8) The differential signal at the oscilloscope should be

approximately 62.5mVP-P at 300MHz.

9) Enable the power supply and signal generator

output. Observe for outputs from OUT+ and OUT- on

the oscilloscope.

10) The differential signal at the oscilloscope should be

approximately 125mVP-P at 300MHz.

Detailed Description of Hardware

The MAX40660 accepts AC and DC-coupled input

from a high-speed photodiode. The EV kit facilitates

evaluation of the MAX40660 TIA without a photodiode.

The MAX40660 TIA is designed to be used with

optical transceiver systems when the detector’s (APD,

PIN diodes) cathode connected to the IN input of the IC.

The device is to be used when AC input currents are flowing

out of the device at IN input of the IC.

When an APD with negative bias voltage is connected to

the TIA input the signal current flows out of the amplifier’s

summing node. The input current flows through an internal

load resistor to develop a voltage that is then applied to the

input of the second stage. An internal clamp circuit protects

against input currents up to 100mA up to 100ns and up to

2A for 10ns pulses at low duty cycles. For more information

about the device, please refer to the IC data sheet.

Theory of Operation

The MAX40660 EV kit provides photodiode emulation

using a simplified electrical photodiode model. The model

provides a 50Ω electrical input termination, and resistors

that convert the high-speed input voltage to high-speed

current. A DC path is provided to model the average

photodiode current.

Test Interface

The MAX40660 outputs are back terminated with 50Ω.

When terminating the outputs to 50Ω oscilloscope, the

ac-coupling capacitors C6 and C7 are present and

resistor R0 is not installed. When interfacing with subsequent

amplifiers or LVDS- capable devices, ac-coupling capacitors

(C6,C7) and 100Ω resistor (R0) are installed when the

subsequent device has internal bias. Replace C6 and C7

ac coupling capacitors with 0Ω resistors in case of DC

coupling into the device.

Table 1. Jumper Function

*Default position

JUMPER

LABEL POSITION FUNCTIONS

2-3* Enables U1. Active Mode

1-2 Disables U1 or Low Power

Disable Mode

J2 2-3* Low Gain Mode Selected

(25kΩ Transimpedance)

1-2 High Gain Mode Selected

(50kΩ Transimpedance)

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MAX40660 Evaluation Kit

Input and OFFSET Input DC Evaluation

The MAX40660 EV kit features DC evaluation of IN input

and OFFSET input.

When evaluating the MAX40660’s IN input in DC mode

at I_DC_IN (J3) using a calibrator with voltage output

option, 0Ω is installed at resistor R3, capacitors CIN1 and

CIN2 are removed. Current value set in microamperes will

provide a differential voltage output function of

transimpedance selected.

When evaluating the MAX40660’s IN input in DC mode

at I_DC_IN (J3) using a calibrator with voltage output

option, 0Ω is installed at resistor R3, and capacitor C8,

CIN1 and CIN2 are removed. Resistors R1 and R2 sets

the input resistance (RS), the bias voltage at IN (VIN) is

855mV. The voltage value set at the calibrator will dictate

the input current by the following equation:

IIN(μA) = [VCAL-SET(V) - VIN(V)]/RS - (1)

Current value in microamperes will provide a differential

voltage output function of transimpedance selected.

When evaluating the MAX40660’s IN input in DC mode

at I_OFFSET(J5) using a calibrator with current output

option, resistor R4 is replaced with 0Ω. Current value set

in microamperes will provide a differential voltage output

function of transimpedance selected.

When evaluating the MAX40660’s IN input in DC mode at

I_DC_IN (J3) using a calibrator with voltage output option,

capacitor C9 is removed. Resistor R4 sets the input

resistance and the bias voltage at OFFSET (VOFFSET) is

855mV. The voltage value set at the calibrator will dictate

the input current by the following equation:

IIN(μA) = [VCAL-SET(V) – VOFFSET(V)]/R4 - (2)

Current value in microamperes will provide a differential

voltage output function of transimpedance selected.

The outputs are observed with ac-coupling capacitors

C6 and C7 replaced with 0Ω and resistor R0 with 100Ω

installed. The transimpedance is measured with ac-coupled

setup, hence with the above method the transimpedance

observed will seem to be twice as what it is.

More information about the transfer function curve for IN

and OFFSET input can be referred to TOC9 and TOC10

in datasheet. This is useful in determining the load line

curve for optimized performance for a given diode.

Current Pulse Measurements

To perform pulse measurements, the current pulses are

created by providing a voltage pulse at the J4 input. The

input series resistance combination (R1+R2) respectively

determines the amplitude of the current pulse.

Both AC and DC coupling at the IN input may be used

for this test. When using DC blocking capacitors, C1 and

C2 is used in conjunction with the test. When providing

the input voltage pulse at IN_AC edge mount SMA , the

DC blocking capacitors C1 and C2 are replaced with 0Ω

short to DC couple the input to the MAX40660. Make sure

resistor R3 is not installed.

The following resistor settings RS = (R1 + R2) is shown

in Table 2 to create the large signal current amplitude

pulses.

To generate < 100μA small signal currents, see Equation 1.

Noise measurements

Remove the input resistors and shunt capacitor before

attempting noise measurement. With the input resistors

and shunt capacitor removed, the total capacitance at the

IN-input is equal to 0.5pF.

Table 2. Different Values of RS (R1+R2) for Different Input Current Pulse Amplitudes.

#Denotes RoHS compliant

INPUT SERIES

RESISTANCE RS (Ω)

GENERATOR INPUT

HIGH VOLTAGE (V)

GENERATOR INPUT LOW

VOLTAGE (V)

GENERATED INPUT CURRENT

STEP FROM IN (mA)

0.855 0.65 1

0.855 0.15 10

0.855 -1.06 50

0.855 -2.46 100

PART TYPE

MAX40660EVKIT# EV kit

Ordering Information

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MAX40660 Evaluation Kit

ITEM REF_DES DNI/DNP QTY MFG PART # MANUFACTURER VALUE DESCRIPTION

1 C1, CIN1 — 2

C0402C101J5GAC;

NMC0402NPO101J;

CC0402JRNPO9BN101;

GRM1555C1H101JA01;

C1005C0G1H101J050BA;

CGA2B2C0G1H101J050BA

KEMET;

NIC COMPONENTS CORP.;

YAGEO PHICOMP;

MURATA;TDK;TDK

100PF CAPACITOR; SMT (0402); CERAMIC CHIP; 100PF; 50V;

TOL = 5%; TG = -55°C TO +125°C; TC = C0G

2 C2 — 1 C0402X7R500-222KNE;

GRM155R71H222KA01 VENKEL LTD.;MURATA 2200PF CAPACITOR; SMT (0402); CERAMIC CHIP; 2200PF; 50V;

TOL = 10%; TG = -55°C TO +125°C; TC = X7R

3 C3 — 1 C0402X5R100-105KNE;

GRM155R61A105KE15 VENKEL LTD.;MURATA 1UF CAPACITOR; SMT (0402); CERAMIC CHIP; 1UF; 10V;

TOL = 10%; MODEL =; TG = -55°C TO +85°C; TC = X5R

4 C4, C6-C8 — 4 GRM155R61C104KA88 MURATA 0.1UF CAPACITOR; SMT (0402); CERAMIC; 0.1UF; 16V; TOL = 10%;

MODEL = GRM SERIES; TG = -55°C to +85°C; TC = X5R

5 C5 — 1

C0402X5R6R3-225MNP;

C0402C225M9PAC;

GRM155R60J225ME15;

\JMK105BJ225MV

VENKEL;KEMET;MURATA;

TAIYO YUDEN 2.2UF CAPACITOR; SMT; 0402; CERAMIC; 2.2µF; 6.3V; 20%; X5R;

-55°C to + 85°C; 0 ±15% °C MAX.

6 CIN2 — 1

CGA2B3X7R1H104K050BB;

C1005X7R1H104K050BB;

GRM155R71H104KE14;

GCM155R71H104KE02;

C1005X7R1H104K050BE;

UMK105B7104KV-FR;

CGA2B3X7R1H104K050BE

TDK;TDK;MURATA;MURATA;

TDK;TAIYO YUDEN;TDK 0.1UF CAPACITOR; SMT (0402); CERAMIC CHIP; 0.1UF; 50V;

TOL = 10%; TG = -55°C TO +125°C; TC = X7R

7GND1, GND2,

VIN_SUPPLY — 3 9020 BUSS WEICO WIRE MAXIMPAD EVK KIT PARTS; MAXIM PAD; WIRE; NATURAL; SOLID;

WEICO WIRE; SOFT DRAWN BUS TYPE-S; 20AWG

8 J1, J2 — 2 PCC03SAAN SULLINS PCC03SAAN CONNECTOR; MALE; THROUGH HOLE; BREAKAWAY;

STRAIGHT THROUGH; 3PINS; -65°C TO +125°C

9 J3, J5 — 2 131-3701-266 JOHNSON COMPONENTS 131-3701-266 CONNECTOR; MALE; THROUGH HOLE;

SMB JACK VERTICAL PCB MOUNT; STRAIGHT; 5PINS

10 J4, J6, J7 — 3 32K243-40ML5 ROSENBERGER 32K243-40ML5 CONNECTOR; FEMALE; SMT; SMA JACK PCB;

RIGHT ANGLE; 2PINS

11 L1 — 1 BLM15BD601SN1 MURATA 600 INDUCTOR; SMT (0402); FERRITE-BEAD; 600; TOL = ±25%; 0.2A

12 MH1-MH4 — 4 P440.375 GENERIC PART N/A MACHINE SCREW; SLOTTED; PAN; 4-40IN; 3/8IN; NYLON

13 MH1-MH4 — 4 1902B GENERIC PART N/A STANDOFF; FEMALE-THREADED; HEX; 4-40IN; 3/8IN; NYLON

14 R1, R2 — 2 ERJ-2RKF1241 PANASONIC 1.24K RESISTOR; 0402; 1.24K ; 1%; 100PPM; 0.10W; THICK FILM

15 R4, RCL — 2 ERJ-2GE0R00 PANASONIC 0 RESISTOR; 0402; 0Ω; 0%; JUMPER; 0.10W; THICK FILM

16 RT — 1

TNPW040249R9BE;

RG1005P-49R9-B-T;

ERA-2AEB49R9

SUSUMU CO LTD.;

PANASONIC;VISHAY 49.9 RESISTOR; 0402; 49.9Ω; 0.1%; 25PPM; 0.063W;

THICK FILM

17 SU1, SU2 — 2 S1100-B;SX1100-B;

STC02SYAN

KYCON;KYCON;

SULLINS ELECTRONICS CORP. SX1100-B TEST POINT; JUMPER; STR; TOTAL LENGTH = 0.24IN; BLACK;

INSULATION = PBT;PHOSPHOR BRONZE CONTACT = GOLD PLATED

18 U1 — 1 MAX40660ATB/VY+ MAXIM MAX40660ATB/VY+

EVKIT PART - IC; TRANSIMPEDANCE AMPLIFIER WITH 100

MILLI-AMPERE INPUT CURRENT CLAMP FOR AUTOMOTIVE LIDAR;

PACKAGE OUTLINE DRAWING: 21-100317; PACKAGE CODE: T1033Y+4C

19 PCB — 1 MAX40660 MAXIM PCB PCB:MAX40660

20 C9, C12 DNP 0 C0402X5R100-105KNE;

GRM155R61A105KE15 VENKEL LTD.;MURATA 1UF CAPACITOR; SMT (0402); CERAMIC CHIP; 1µF; 10V; TOL = 10%;

MODEL = ; TG = -55°C TO +85°C; TC = X5R

21 C10 DNP 0

C0402C101J5GAC;

NMC0402NPO101J;

CC0402JRNPO9BN101;

GRM1555C1H101JA01;

C1005C0G1H101J050BA;

CGA2B2C0G1H101J050BA

KEMET;

NIC COMPONENTS CORP.;

YAGEO PHICOMP;

MURATA;TDK;TDK

100PF CAPACITOR; SMT (0402); CERAMIC CHIP; 100PF; 50V;

TOL = 5%; TG = -55°C TO +125°C; TC = C0G

22 C11 DNP 0 C0402X7R500-222KNE;

GRM155R71H222KA01 VENKEL LTD.;MURATA 2200PF CAPACITOR; SMT (0402); CERAMIC CHIP; 2200PF; 50V;

TOL = 10%; TG = -55°C TO +125°C; TC = X7R

23 R0 DNP 0 ERJ-2RKF1000 PANASONIC 100 RESISTOR; 0402; 100 ; 1%; 100PPM; 0.10W; THICK FILM

24 R3 DNP 0 ERJ-2GE0R00 PANASONIC 0 RESISTOR; 0402; 0Ω; 0%; JUMPER; 0.10W; THICK FILM

25 CD DNP 0 N/A N/A OPEN PACKAGE OUTLINE 0402 NON-POLAR CAPACITOR

38TOTAL

MAX40660 EV Kit Bill of Materials

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MAX40660 Evaluation Kit

MAX40660 EV Kit Schematic

DNI

131-3701-266

I_OFFSET 1

VCC

0.1UF

131-3701-266

0.1UF

MAX40660ATB/VY+

PCC03SAAN

2200PF1UF

IN_AC

100PF 2200PF

0.1UF

100

0.1UF

VCC

1UF

32K243-40ML5

0.1UF

VCC

600

GND

2.2UF

OUT+

32K243-40ML5

I_DC_IN

VCC

OPEN

C10

1 2

VIN_SUPPLY

C12

CIN1

CIN2

RCL

C3C1 C2

100PF

C11

100PF

R2R1

32K243-40ML5

PCC03SAAN

OUT-

DNIDNIDNI

DNI

49.9

1.24K 1.24K

GND

VCC

OUTP

OUTN

GNDGAIN

OFFSET

VCL

m (-1 L9 . L'J 1‘er @498 F-

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MAX40660 Evaluation Kit

MAX40660 EV Kit PCB Layout—Top Silkscreen

MAX40660 EV Kit PCB Layout—Layer 2 Ground

MAX40660 EV Kit PCB Layout—Top Layer

MAX40660 EV Kit PCB Layout Diagrams

1.0’’

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MAX40660 Evaluation Kit

MAX40660 EV Kit PCB Layout—Layer 3 Power

MAX40660 EV Kit PCB Layout—Bottom Silkscreen

MAX40660 EV Kit PCB Layout—Bottom Layer

MAX40660 EV Kit PCB Layout Diagrams (continued)

1.0’’

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.

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MAX40660 Evaluation Kit

REVISION

NUMBER

REVISION

DATE DESCRIPTION PAGES

CHANGED

0 5/19 Initial release —

Revision History

For pricing, delivery, and ordering information, please visit Maxim Integrated’s online storefront at https://www.maximintegrated.com/en/storefront/storefront.html.

MAX40660 Evaluation Kit Datasheet

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