MAX4209KAUA+ [MAXIM]

Configurable Reference Voltage: Externally or Internally Buffered;


型号：	MAX4209KAUA+
厂家：	MAXIM INTEGRATED PRODUCTS
描述：	Configurable Reference Voltage: Externally or Internally Buffered
文件：	总6页 (文件大小：96K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

±9-099ꢀ; Rev 0; 9/0ꢀ

MAX4208 Evaluation Kit

Evluates:8/MAX4209

General Description

Features

The MAX4208 evaluation kit (EV kit) simplifies evalua-

tion of the MAX4208 ultra-low offset/drift, adjustable

gain, precision instrumentation amplifier in a µMAX^®

package. The MAX4208 features high-impedance dif-

ferential inputs optimized for small voltages (±±00mV

max) and provides rail-to-rail output. The MAX4208 EV

kit is configured for a gain of ±48V/V. The EV kit oper-

ates from a single-supply voltage between 2.85V and

5.5V, or dual supplies providing ±±.425V to ±2.ꢀ5V.

o Single- or Dual-Supply Operation

2.85V to 5.5V Single-Supply Operation

±±.ꢀ25V to ±2.ꢁ5V Dual-Supply Operation

o Adjustable Voltage Gain Configured to ±ꢀ8V/V

o Rail-to-Rail Output

o Configurable Reference Voltage: Externally or

Internally Buffered

The MAX4208 EV kit can also be used to evaluate the

MAX4209 fixed-gain amplifiers. The MAX4208 IC tem-

perature range is -40°C to +±25°C.

o Optional Current-Sense Mode

o Fully Assembled and Tested

The MAX4209 EV kit, available separately, evaluates the

±00V/V fixed-gain MAX4209 amplifier without external

gain-setting resistors.

Note: To evaluate a MAX4209 IC featuring internal

gain-setting resistors, order a MAX4209EVKIT+ or

request a free sample of the MAX4209 IC along with the

MAX4208EVKIT+. See the Part Selection Table for IC

ordering information.

Ordering Information

Component List

PART

TYPE

DESIGNATION QTY

DESCRIPTION

MAX4208EVKIT+

EV Kit

±0µF ±±0ꢁ, ±0V X5R ceramic

capacitors (0805)

Murata GRM2±BR6±A±06K

KEMET C0805C±06K8PAC

+Denotes lead-free and RoHS-compliant

C±, C3

0.±µF ±±0ꢁ, ±0V X5R ceramic

capacitors (0402)

Part Selection Table

C2, C4, C5

Murata GRM±55R6±A±04K

KEMET C0402C±04K8RACTU

PART

MAX4208AUA+

GAIN (V/V)

Adjustable

±0

C6, Cꢀ

Not installed, capacitors (0603)

MAX4209TAUA+

MAX4209HAUA+

MAX4209KAUA+

±000pF ±±0ꢁ, ±6V X5R ceramic

capacitor (0402)

Murata GRM±55R6±C±02K

±00

±000

JU±

4-pin header

2-pin headers

JU2, JU3

±kΩ ±0.±ꢁ resistor (0805)

IRC PCF-W0805LF-03-±00±-B

±4ꢀkΩ ±0.±ꢁ resistor (0805)

IRC PCF-W0805LF-03-±4ꢀ3-B

R±

R3, R4

R5, R6

Rꢀ

4.99kΩ ±±ꢁ resistors (0603)

Not installed, resistors—short (0603)

Not installed, resistor (±206)

MAX4208AUA+ (8-pin µMAX)

Shunts

U±

—

PCB: MAX4208 Evaluation Kit+

µMAX is a registered trademark of Maxim Integrated Products, Inc.

________________________________________________________________ Maxim Integrated Products

For pricing, delivery, and ordering information, please contact Maxim Direct at ±-888-629-ꢀ6ꢀ2,

or visit Maxim's website at www.maxim-ic.com.

MAX4208 Evaluation Kit

Component Suppliers

SUPPLIER

PHONE

WEBSITE

www.irctt.com

IRC

36±-992-ꢀ900

864-963-6300

ꢀꢀ0-436-±300

KEMET Corp.

www.kemet.com

Murata Mfg. Co., Ltd.

www.murata.com

Note: Indicate that you are using the MAX4208 or MAX4209 when contacting these component suppliers.

Quick Start

Recommended Equipment

Before beginning, the following equipment is needed:

Detailed Description

The MAX4208 EV kit evaluates the MAX4208 instrumenta-

tion amplifier that features adjustable gain with gain-

setting resistors R± and R2, low offset voltage, and low

offset voltage drift. The output-voltage range is from VSS

+ ±00mV, to VDD - ±00mV. The MAX4208 EV kit voltage

gain is configured to ±48V/V. The EV kit operates from a

single-supply voltage between 2.85V and 5.5V or from

a dual-supply voltage providing ±±.425V to ±2.ꢀ5V.

•

5V, ±A-rated DC power supply

Function generator

Oscilloscope

Procedure

The MAX4208 EV kit is fully assembled and tested.

Follow the steps below to verify board operation.

Caution: Do not turn on the power supply until all

connections are completed.

The MAX4208 EV kit can evaluate the fixed-gain

MAX4209 ICs in the 8-pin µMAX package by replacing

the MAX4208 IC U± and removing resistors R± and R2.

Power Supply

The MAX4208 EV kit jumper JU2 must be configured

properly for single-supply or dual-supply operation. For

single-supply operation, a single power supply is con-

nected to VDD and GND. For dual-supply operation,

connect a positive supply to VDD, a negative supply to

VSS, and supply ground to GND. See Table ± to config-

ure jumper JU2.

±) Verify that a shunt is installed across pins ±-4 of

jumper JU± (on-board buffered-reference mode).

2) Verify that a shunt is installed on jumper JU2 (single-

supply operation).

3) Verify that a jumper is not installed on jumper JU3

(buffered-reference mode).

Evluates:8/MAX4209

4) Set the DC power-supply output to 5V and disable

the output.

5) Set the function generator output to a ±0mV

P-P

200Hz, 0V DC offset sine wave. Terminate the func-

tion generator as needed.

Table ±. Power-Supply Configuration

(Jumper JU2)

6) Connect the power-supply positive output to the

VDD PCB pad on the EV kit.

SHUNT

POSITION

VSS PIN

EV KIT FUNCTION

ꢀ) Connect the power-supply ground to the GND PCB

pad next to VDD on the EV kit.

Connected to

GND

Single-supply operation.

Power only VDD.

Installed

8) Connect the function generator output across the

differential input PCB pads, IN+ and IN-.

Dual-supply operation.

Power VDD and VSS.

Not installed

Not connected

9) Connect the IN- PCB pad to the GND PCB pad with

a wire.

±0) Connect the oscilloscope to the OUT PCB pad and

the oscilloscope ground clip to the GND PCB pad.

±±) Enable the DC power supply and the function gen-

erator.

±2) Verify that the oscilloscope measures a ±.48V

200Hz, 2.5V DC offset sine wave.

P-P

_______________________________________________________________________________________

MAX4208 Evaluation Kit

Evluates:8/MAX4209

REFIN/MODE Operation Modes

The EV kit jumper JU± configures the MAX4208 for direct

reference, buffered reference, or shutdown mode. The

reference voltage at REF sets the output voltage DC sig-

REF Input

The EV kit’s jumper JU3 must be configured properly

for appropriate reference-voltage operation. In direct

reference mode, install a shunt on jumper JU3 to con-

nect REF to the on-board ground (GND), or remove the

shunt to connect a user reference voltage to the REF

input PCB pad. For either buffered-reference mode,

REF must not be connected to a reference voltage;

thus, the shunt on jumper JU3 must not be installed.

See Table 2 for jumper JU3 configurations.

nal, OUT, when the differential input signal V

- V

IN-

IN+

equals zero. In direct-reference-mode operation, con-

nect a user reference voltage directly to the REF PCB

pad. In buffered-reference-mode operation, connect a

user reference voltage to the REFIN/MODE input PCB

pad or use the resistor-divider network R3 and R4 to

provide a reference voltage for REFIN/MODE, scaled

from VDD. The network is configured to scale the volt-

age at REFIN/MODE to one-half of VDD. Replace resis-

tors R3 and R4 to modify the voltage applied to

REFIN/MODE using the following equation:

Optional capacitor C6 can be used for reference-volt-

age stability/filtering. Choose an appropriate value as

needed.

On-Board Current Sensing

The MAX4208 EV kit can be configured for on-board

current sensing by installing a surface-mount ±206

sense resistor at Rꢀ, located between the IN+ and IN-

PCB pads. Use the following equation to select the

value for resistor Rꢀ:

⎛

⎞

R3 + R4

= VDD x

REFIN/MODE

⎜

⎟

⎝

⎠

where VDD is the input supply voltage to the EV kit.

30mV

In buffered-reference mode, the MAX4208 internally

buffers the REFIN/MODE voltage onto REF.

Rꢀ =

Note: Do not connect an external source to the REF PCB

pad in buffered-reference mode. See Table 2 for jumper

JU± configurations.

where I is the maximum current flowing across resis-

tor Rꢀ and 30mV is a suggested sense voltage. 30mV x

±48V/V gives a 4.4V output swing. Refer to the

Table 2. Jumpers JU± and JU3 Configurations

JU± SHUNT

POSITION

REFIN/MODE JU3 SHUNT

MODE

REF PIN

EV KIT FUNCTION

POSITION

Connected to JU± disables the internal REF buffer.

Installed

GND

JU3 sets the REF voltage to GND.

JU± disables the internal REF buffer.

JU3 allows the user to set the REF

Not installed user reference voltage directly. Apply a user reference

Direct-reference-mode

operation

Connected to

VSS

±-2

Connected to

voltage to the REF PCB pad in the 0V

and VDD - ±.6V range.

voltage

Connected to

VDD

Shutdown mode

±-3

±-4

—

Entire IC is in shutdown. I

< 5µA.

Buffered-reference-

mode operation

(on-board reference)

The IC buffers the on-board VDD / 2

Connected to

VDD / 2

Not installed Not connected onto REF. Do not install JU3 or connect

an external source to the REF PCB pad.

The IC buffers a user reference voltage

onto REF. Apply a user reference

voltage to the REFIN/MODE PCB pad in

the range of VSS + 200mV and VDD -

±.6V. Do not install JU3 or connect an

external source to the REF PCB pad.

Buffered-reference-

mode operation (user

reference)

Connected to

user reference

voltage

Not installed

Not installed Not connected

_______________________________________________________________________________________

MAX4208 Evaluation Kit

MAX4208/MAX4209 IC data sheet for application

details. Verify that the selected resistor is rated for the

appropriate current and power levels.

high-precision, surface-mount 0805 resistors can

change the gain. Tolerance of ±0.±ꢁ or better is rec-

ommended for optimum performance. Use the follow-

ing equation to select values for resistors R± and R2:

For high-power applications, use the IN+ and IN- PCB

pads as sense connections to an off-board current-

sense resistor.

R2 = R± x (Gain - ±)

where R± ≤ ±kΩ and the sum of R± + R2 is ±0kΩ ≤ (R± +

R2) ≤ 500kΩ.

Differential Input Filter

The MAX4208 EV kit features an optional balanced-dif-

ferential resistor-capacitor filter across the MAX4208

IN+ and IN- input pins. Use the surface-mount 0603

PCB pads for installing resistors R5, R6, and capacitor

Cꢀ, which form the filter. Before installing resistors R5

and R6, cut open the shorting PCB trace located at the

respective pads.

Evaluating the MAX4209

The MAX4208 EV kit can be used to evaluate the fixed-

gain MAX4209 IC in the 8-pin µMAX package by replac-

ing the MAX4208 IC U± and removing resistors R± and

R2. The MAX4209 IC features fixed gains of ±0V/V,

±00V/V, or ±000V/V. See the Part Selection Table for

ordering information.

The MAX4209 EV kit is also available separately.

Gain Setting

The MAX4208 EV kit gain is configured to ±48V/V by

resistors R± and R2. Replacing these resistors with

VDD

10μF

4.99kΩ

GND

4.99kΩ

Evluates:8/MAX4209

VSS

JU1

REFIN/MODE

GND

REFIN/MODE

0.1μF

SHORT

IN-

IN+

OUT

GND

147kΩ

0.1%

OPEN

1000pF

OPEN

MAX4208

SHORT

IN+

1kΩ

0.1%

VSS

REF

VSS

REF

0.1μF

OPEN

JU3

10μF

JU2

GND

Figure ±. MAX4208 EV Kit Schematic

ꢀ

_______________________________________________________________________________________

MAX4208 Evaluation Kit

Evluates:8/MAX4209

Figure 3. MAX4208 EV Kit PCB Layout—Component Side

Figure 2. MAX4208 EV Kit Component Placement Guide—

(Component Side)

_______________________________________________________________________________________

MAX4208 Evaluation Kit

Figure 4. MAX4208 EV Kit PCB Layout—Solder Side

Evluates:8/MAX4209

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.

6 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600

is a registered trademark of Maxim Integrated Products, Inc.

MAX4209KAUA+ [MAXIM]

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