Intersil ISL71218MEVAL1Z User manual

Rev.0.00 Aug 2017

User’s Manual

ISL71218MEVAL1Z

User’s Manual: Evaluation Board

High Reliability Space

UG139 Rev.0.00 Page 2 of 14

Aug 17, 2017

UG139

Rev.0.00

Aug 17, 2017

ISL71218MEVAL1Z

Evaluation Board

USER’S MANUAL

1. Overview

The ISL71218MEVAL1Z evaluation platform is designed to evaluate the ISL71218M. The ISL71218M is a single

supply, rail-to-rail output, dual amplifier with ground sensing inputs that allow the common-mode input voltage to

swing 0.5V below the V- rail. The ISL71218M can operate from a single or dual supply with a 3V to 40V supply

range. The ISL71218M features very low power, low offset voltage, and low temperature drift, making it ideal for

applications for precision instrumentation, current sensing, and power supply and industrial process controls.

1.1 Key Features

•Wide V

IN range single or dual supply operation

• +1.8V/-1.2V to ±20V

• 3.0V to 40V

• Singled-ended or differential input operation

• External VREF input

• Banana jack connectors for power supply and VREF inputs

• BNC connectors for op amp input and output terminals

• Convenient PCB pads for op amp input/output impedance loading

1.2 Specifications

• V+ range: 1.8V to 20V

• V- range: -1.2V to -20V

1.3 Ordering Information

1.4 Related Literature

• For a full list of related documents, visit our website

•ISL71218M product page

Part Number Description

ISL71218MEVAL1Z ISL71218MEVAL1Z evaluation board

UG139 Rev.0.00 Page 3 of 14

Aug 17, 2017

ISL71218MEVAL1Z 1. Overview

Figure 1. Basic Differential Amplifier Configuration

VREF

IN+

GND

100kΩ

OPEN

OUT

ISL71218MBZ

V-

0Ω

VCM

IN-

IN+

VREF

V+

10kΩ

OPEN

R39, R47, R49, R50

R14, R16,

R32

R51 TO R54

R67 TO R70

IN-A

IN-B 6

OUT_A 1

OUT_B 7

OUT_C 8

OUT_D 14

IN-C

IN-D 13

IN+A

IN+B 5

IN+C

IN+D 12

R5, R7,

R9, R35

R18, R40

100kΩ

R33

UG139 Rev.0.00 Page 4 of 14

Aug 17, 2017

ISL71218MEVAL1Z 2. Functional Description

2. Functional Description

2.1 Power Supply Connections

Figure 2. Power Supply Circuit

Figure 2 shows the power supply connections, decoupling and protection circuitry. External power connections are

made through the V+, V-, VREF, and GND banana jack connections on the evaluation board. Decoupling

capacitors, C2 and C26, provide low-frequency power-supply filtering, while additional capacitors (C1, C3, C4, and

C5, connected close to the part) filter out high-frequency noise, and are connected to their respective supplies

through R37 and R48 resistors. These resistors are 0Ω but can be changed by the user to provide additional power

supply filtering, or to reduce the supply voltage rate-of-rise time. Anti-reverse diodes, D1 and D2, protect the

circuit in case of momentarily reversing the power supplies accidentally to the evaluation board. The VREF pin can

be connected to ground to establish a ground referenced input for split supply operation.

2.2 Amplifier Configuration

A simplified schematic of the evaluation board is shown in Figure 1 on page 3. The input stage with the

components supplied is shown in Figure 3. The circuit implements a Hi-Z differential input with unbalanced

common-mode impedance. The differential amplifier gain is expressed in Equation 1:

For a single-ended input with an inverting gain G = -10V/V, the IN+ input is grounded and the signal is supplied to

the IN- input. VREF must be connected to a reference voltage between the V+ and V- supply rails. For a

non-inverting operation with G = 11V/V, the negative input (IN-) is grounded and the signal is supplied to the

positive input (IN+). The non-inverting gain is strongly dependent on any resistance from IN- to GND. For good

gain accuracy, a 0Ω resistor should be installed on the empty R11 pad.

R37

D1D2 R48

C2C26

0Ω

1µF 1µF

VREF

V+

V-

0.1µF

GND

V- V+

R44

0Ω

V- AND V+

IC SUPPLY PINS

0.01µF

VOUT VIN+

VIN-RF

 RIN–VREF

(EQ. 1)

UG139 Rev.0.00 Page 5 of 14

Aug 17, 2017

ISL71218MEVAL1Z 2. Functional Description

2.3 User-Selectable Options

Component pads are included to enable a variety of user-selectable circuits to be added to the amplifier inputs, the

VREF input, outputs, and the amplifier feedback loops.

A voltage divider can be added to establish a power supply-tracking common-mode reference using the VREF

input. The inverting and noninverting inputs have additional resistor and capacitor placements for adding input

attenuation or feedback capacitors (Figure 3).

The outputs (Figure 4) also have additional resistor and capacitor placements for filtering and loading.

Note: Operational amplifiers are sensitive to output capacitance and may oscillate. In the event of oscillation,

reduce output capacitance by using shorter cables, or add a resistor in series with the output.

Figure 3. Input Stage

Figure 4. Output Stage

R11

R39

R14

10kΩ

DNP

0Ω

10kΩ

100kΩ

OPEN

TO IN-A

TO IN+A

FROM OUT_A

OPEN

R20

DNP

C23

OPEN

R15

0Ω

DNP

R21

IN+A

IN-A

OUT A

R51 J13

C15

R59

DNP

OPEN

0Ω

C14

OPEN

R55

DNP

R63

0Ω

R67

DNP

OUT_A

UG139 Rev.0.00 Page 6 of 14

Aug 17, 2017

ISL71218MEVAL1Z 3. PCB Layout Guidelines

3. PCB Layout Guidelines

Analog circuits can conduct noise through paths that connect it to the “outside world”. To minimize the effects of any

noise through the power lines, it is recommended to decouple the power supply pins (V+ and V-). If the trace lines to

the power supply pins are long, it is recommended to place high frequency decoupling capacitors (such as 0.1µF) right

next to the power supply in, and a larger capacitor value (such as 1µF) at the point of entry for the power supply.

3.1 ISL71218MEVAL1Z Evaluation Board

Figure 5. ISL71218MEVAL1Z Evaluation Board

UG139 Rev.0.00 Page 7 of 14

Aug 17, 2017

ISL71218MEVAL1Z 3. PCB Layout Guidelines

3.2 ISL71218MEVAL1Z Schematic Diagram

Figure 6. ISL71218MEVAL1Z Schematic

RELEASED BY:

DRAW N BY: DATE:

DATE:

ENGINEER:

TITLE:

08/01/2017

TIM KLEMANN

ISL71218SR

KIRAN BERNARD

OUT A

OUT B

C3 AND C5 CLOSE TO PART

IN- A

IN+ A

IN- B

IN+ B

V-

VREF

V+ VREF

DNP

R20

DNP

R24

0.1UF

R11

100

R21

DNP

V+

-IN_B

OUT_B

OUTA

V- +IN_B

+IN_A

-IN_A

ISL71218MBZ

4 5

R23

DNP

R17

10K

DNP

R14

OPEN

DNP

J11

10K

0.01UF

100K

R12

R22

DNP

10K

R10

10K

R18

R15

100

0.01UF

OPEN

J12

0.1UF

OPEN

C12

100K

R13

DNP

J10

OPEN

C11

OPEN

R19

OPEN

C10

1UF

100K

R16

UNNAMED_1_BNC 4G_I87_IN1

UNNAMED_1_BNC 4G_I88_IN1

UNNAMED_1_BNC 4G_I89_IN1

UNNAMED_1_BNC 4G_I90_IN1

UNNAMED_1_SMC AP_I101_AUNNAMED_1_SMC AP_I102_B

UNNAMED_1_SMC AP_I127_AUNNAMED_1_SMCAP_I127_BUNNAMED_1_SMC AP_I133_B

UNNAMED_1_SMC AP_I27_A

UNNAMED_1_SMC AP_I29_B

UNNAMED_1_SMR ES_I111_BUNNAMED_1_SMRES_I120_B

UNNAMED_1_SMRES_I129_A

UNNAMED_1_SMRES_I12_B

UNNAMED_1_SMR ES_I13_B

UG139 Rev.0.00 Page 8 of 14

Aug 17, 2017

ISL71218MEVAL1Z 3. PCB Layout Guidelines

3.3 Bill of Materials

3.4 Board Layout

Figure 7. Silkscreen

Table 1. ISL71218SRHMEVAL1Z Components Parts List

Device # Description Comments

C2, C4 CAP, SMD, 1210, 1µF, 50V, 10%, X7R, ROHS Power supply decoupling

C3, C6 CAP, SMD, 0805, 0.1µF, 50V, 10%, X7R, ROHS Power supply decoupling

C5, C7 CAP, SMD, 0603, 0.01µF, 50V, 10%, X7R, ROHS Power supply decoupling

C1, C8-C12 CAP, SMD, 0603, DNP-PLACE HOLDER, ROHS User selectable capacitors - not

populated

D1 DIODE-RECTIFIER, SMD, SOD-123, 2P, 40V, 0.5A,

ROHS

Reverse power protection

U1 ISL71218MBZ, DUAL OP-AMP, 8Ld. SOIC

R1, R2, R5-R8, R14, R20, R23,

R24,

RESISTOR, SMD, 0603, 0.1%, MF, DNP-PLACE

HOLDER

User selectable resistors - not populated

R3, R20-R22 RES, SMD, 0603, 0, 1/10W,TF, ROHS Zero ohm user selectable resistors

R4, R10, R17, R18 RES, SMD, 0603, 10k, 1/10W, 1%, TF, ROHS Gain resistors

R10, R12, R13, R16 RES, SMD, 0603, 100k, 1/10W, 1%, TF, ROHS Gain resistors

UG139 Rev.0.00 Page 9 of 14

Aug 17, 2017

ISL71218MEVAL1Z 3. PCB Layout Guidelines

Figure 8. Top Layer

Figure 9. Bottom Layer

UG139 Rev.0.00 Page 10 of 14

Aug 17, 2017

ISL71218MEVAL1Z 4. Typical Performance Curves

4. Typical Performance Curves

Figure 10. Gain vs Frequency vs RL, VS = ±15V Figure 11. Gain vs Frequency vs RL, VS = ±5V

Figure 12. Output Voltage Swing vs Load Current,

VS = ±15V

Figure 13. Output Voltage Swing vs Load Current,

VS = ±5V

Figure 14. Large Signal 10V Step Response, VS= ±15V Figure 15. Large Signal 4V Step Response, VS= ±5V

Frequency (Hz)

Normalized Gain (dB)

100k 1M 10M10k1k

-9

-8

-7

-6

-5

-4

-3

-2

-1

100

VS = ±15V

AV = +1

VOUT = 100mVP-P

CL = 4pF

RL = 1k

RL = 499

RL = 100

RL = 49.9

RL = OPEN, 100k, 10k

Frequency (Hz)

Normalized Gain (dB)

100k 1M 10M10k1k

-9

-8

-7

-6

-5

-4

-3

-2

-1

100

VS = ±5V

AV = +1

VOUT = 100mVP-P

CL = 4pF

RL = OPEN, 100k, 10k

RL = 1k

RL = 499

RL = 100

RL = 49.9

I-Force (mA)

-15

-14

-13

-12

-11

2218161412108642

-10

0°C

-40°C

+25°C

+75°C

+125°C

20 24

-55°C

VS = ±15V

AV = 2

VIN = ±7.5V-DC

RF = RG = 100k

I-Force (mA)

-5

-4

-3

-2

-1

VS = ±5V

AV = 2

VIN = ±2.5V-DC

RF = RG = 100k

0°C

-40°C

+25°C

+75°C

+125°C

-55°C

022181614121086422024

-6

-4

-2

0 102030405060708090100

OUT

(V)

Time (µs)

VS = ±15V

AV = 1

RL = 2k

CL = 4pF

0 102030405060708090100

OUT

(V)

Time (µs)

-2.4

-2.0

-1.6

-1.2

-0.8

-0.4

0.4

0.8

1.2

1.6

2.0

2.4

VS = ±5V

AV = 1

RL = 2k

CL = 4pF

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