Texas Instruments AMC1311EVM User manual

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AMC1311EVM Users Guide
User's Guide
SLAU745–November 2017
AMC1311EVM Users Guide
The AMC1311 is a precision isolation amplifier with an output separated from the input circuitry by a
silicon dioxide (SiO2) barrier that is highly resistant to magnetic interference. This barrier has been
certified to provide reinforced galvanic isolation of up to 7000 VPEAK per DIN V VDE V 0884-11 (VDE V
0884-11): 2017-01.
Contents
1 Introduction ................................................................................................................... 2
1.1 Features.............................................................................................................. 2
2 Analog Interface.............................................................................................................. 2
2.1 Analog Input......................................................................................................... 2
2.2 Shutdown ............................................................................................................ 3
2.3 Analog Output....................................................................................................... 3
3 Power Supplies .............................................................................................................. 4
3.1 VDD1 Input .......................................................................................................... 4
3.2 VDD2 Input .......................................................................................................... 4
4 EVM Operation............................................................................................................... 5
4.1 Isolated Power and Analog Inputs: J1 and J4 .................................................................. 5
4.2 User Power and Analog Outputs: J2, J3 and J6................................................................ 5
4.3 Device Operation ................................................................................................... 6
5 Board Layout ................................................................................................................. 6
6 Schematic and Bill of Materials ............................................................................................ 7
6.1 Bill of Materials...................................................................................................... 7
6.2 Schematic............................................................................................................ 8
7 Related Documentation..................................................................................................... 9
List of Figures
1 AMC1311EVM Schematic – Analog Input Section...................................................................... 2
2 AMC1311EVM Schematic – Analog Output Section ................................................................... 3
3 VDD1 Input ................................................................................................................... 4
4 VDD2 Input Connector...................................................................................................... 4
5 AMC1311 Silk Screen Drawing............................................................................................ 6
6 AMC1311EVM Schematic.................................................................................................. 8
List of Tables
1 J1 – Analog Input............................................................................................................ 5
2 J4 - VDD1 Power ............................................................................................................ 5
3 J2 – Differential Analog Output ............................................................................................ 5
4 J3 – VDD2 Power............................................................................................................ 5
5 J6 – Single-Ended Analog Output......................................................................................... 6
6 Bill of Materials............................................................................................................... 7

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Trademarks
All trademarks are the property of their respective owners.
1 Introduction
For use in high-resolution voltage measurement applications, the high-impedance input of the AMC1311 is
optimized for connection to high-voltage resistive dividers or other voltage signal sources with high output
resistance.
Throughout this document, the abbreviation EVM and the term evaluation module are synonymous with
the AMC1311EVM.
1.1 Features
• Full-featured Evaluation Module for the AMC1311 single-channel precision isolation amplifier.
• Screw terminals for easy access to analog inputs and outputs.
• Transformer and rectifiers to provide an isolated 5-V source to VDD1.
• Differential to Single-ended output option.
2 Analog Interface
The analog input to the AMC1311 is routed from a three-wire screw terminal screw at J1.1 which provides
access to the VINP terminal. A test point, TP1 is also provided along with pads for 1206 size user installed
series resistors R1, R2 and R3 to create a voltage divider circuit for the input to the AMC1311. The analog
input is referenced to J1.2 or TP2.
2.1 Analog Input
The default analog input to the AMC1311EVM board is comprised of R4 and C3 which form a simple anti-
aliasing filter with a corner frequency of 723 Hz. The input circuit for the AMC1311 is shown in Figure 1.
Using a signal generator or other voltage source, the user can apply an input signal directly to J1 pin 1.
The maximum voltage input to the AMC1311 via J1.1 is 2 V referenced to J1.2 or TP2.
Figure 1. AMC1311EVM Schematic – Analog Input Section

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41 + 42 + 43 =
8
621F8 +02
8
+02
T44
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AMC1311EVM Users Guide
With user installed resistor options R1 through R3, an external voltage source can be applied between
TP1 and GND1 via J1.2 or TP2. As depicted in Figure 1, with R4 installed as 10 kΩ, resistors R1 through
R3 can be chosen according to Equation 1:
(1)
2.2 Shutdown
The AMC1311 features a shutdown option which is an active high input. Shunt jumper SH-J7 is installed
by default and allows for normal operation of the AMC1311 device. When the shunt jumper is removed,
the AMC1311 enters into a low power mode by means of an internal pullup resistor for battery or other
power sensitive applications. For external shutdown operation, J1.3 provides access to the SHTDN pin
when shunt SH-J7 is removed.
2.3 Analog Output
The analog output from the AMC1311EVM board is a fully differential signal centered at 1.44 V. The
differential output of U1 is available on the two screw terminals of J2 as shown below in Figure 2. U4 and
U5 provide the user with a single-ended version of the analog output on J6 pin 1. U5 is designed to
provide bias voltage to the difference amplifier configuration of U4. The single ended output provides unity
gain with an output voltage swing from 0.5 V to 2.5 V. If a different bias voltage is desired, the shunt on J8
can be moved to cover pins 2-3 and an external voltage source may be applied to TP4 referenced to
GND2 via TP3.
Figure 2. AMC1311EVM Schematic – Analog Output Section

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3 Power Supplies
The AMC1311EVM requires two separate power rails, VDD1 and VDD2. VDD1 is on the high voltage side
of the amplifier. VDD2 is on the user side of the amplifier.
3.1 VDD1 Input
The default configuration of the EVM provides 5V to VDD1 through transformer T1 via U3, an SN6501
push-pull driver. A shunt on jumper J5 is shorting pins 1-2 which routes the regulated 5V from U2, a
TPS76350, to pin 1 of U1. The screw terminal at J4 allows the user to provide their own VDD1 source
when the shunt on J5 is covering pins 2-3. The VDD1 supply should be between 3 and 5.5 VDC when
using an external voltage source. The input power scheme is shown in Figure 3.
Figure 3. VDD1 Input
3.2 VDD2 Input
The user side of the AMC1311 isolation amplifier is rated for 3.0 to 5.5 VDC and is applied to the amplifier
using J3 pin 1. When using the on-board transformer for VDD1, a minimum of 3.6 V is needed at J3.
Figure 4 depicts the power input for VDD2.
Figure 4. VDD2 Input Connector

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4 EVM Operation
The following section describes the general operation of the AMC1311EVM.
4.1 Isolated Power and Analog Inputs: J1 and J4
The analog input voltage to the AMC1311EVM can be applied directly to J1 pins 1 and 2.
Table 1 lists the details of J1.
Table 1. J1 – Analog Input
Pin Number Signal Description
J1.1 VINP Analog input to the AMC1311.
J1.2 GND1 Ground connection.
J1.3 ShutDown Optional input to drive the shutdown pin from an external source.
The isolated power input to the AMC1311EVM printed circuit board (PCB) can be applied directly to J4
pins 1 and 2. Table 2 lists the details of J4.
Table 2. J4 - VDD1 Power
Pin Number Signal Description
J4.1 VDD1 Connection to the AMC1311 VDD1 terminal (pin 1) with SH-J5 shorting pins 2-3 on J5.
J4.2 GND1 Connection to the AMC1311 GND1 terminal (pin 4).
CAUTION
Carefully review the AMC1311 product data sheet for the limitations of the
analog input range, and ensure that the appropriate analog/digital voltages are
applied prior to connecting any analog input to the EVM. The transformer on
the evaluation module is rated to 2500 Vrms, but the board is not certified for
high voltage operation.
4.2 User Power and Analog Outputs: J2, J3 and J6
The differential analog output voltage from the AMC1311EVM printed circuit board is applied directly to J2
pins 1 and 2. Table 3 lists the details of J2.
Table 3. J2 – Differential Analog Output
Pin Number Signal Description
J2.1 VOUTN Non-inverting analog output from the AMC1311 (pin 6).
J2.2 VOUTP Inverting output from the AMC1311 (pin 7).
The VDD2 power input to the AMC1311EVM printed circuit board can be applied directly to J3 pins 1 and
2. Table 4 lists the details of J3.
Table 4. J3 – VDD2 Power
Pin Number Signal Description
J3.1 VDD2 Connection to the AMC1311 VDD2 terminal (pin 8).
J3.2 GND2 Connection to the AMC1311 GND2 terminal (pin 5).
The single-ended analog output voltage from the AMC1311EVM printed circuit board is applied directly to
J6 pin 1 referenced to pin 2. Table 5 lists the details of J6.

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Table 5. J6 – Single-Ended Analog Output
Pin Number Signal Description
J6.1 VOUT Single-ended analog output from the AMC1311 through U4.
J6.2 GND2 Ground reference.
4.3 Device Operation
Once the VDD1 and VDD2 power is applied to the AMC1311EVM, the analog output will be available with
a fixed gain of one and a DC offset equal to 1.44 V (typical).
An analog input signal may be applied directly at screw terminal J2. Refer to Figure 1 and Table 2 for
details. The analog input range is specified at 0 to 2 V.
The analog output has a nominal gain of 1 through the AMC1311 isolation amplifier. With an input voltage
of 0 – 2 V, the nominal output is ±1 V differential. The output voltage is centered on 1.44 V providing a
convenient analog input range to the embedded ADCs of the MSP430 and TMS320C2000 series of digital
processors.
5 Board Layout
This section contains the and printed circuit board (PCB) layout of the AMC1311EVM.
NOTE: Board layouts are not to scale. These are intended to show how the board is laid out, and
are not intended to be used for manufacturing AMC1311EVM PCBs.
Figure 5. AMC1311 Silk Screen Drawing

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6 Schematic and Bill of Materials
This section contains the complete bill of materials, and schematic diagram of the AMC1311EVM.
6.1 Bill of Materials
Table 6. Bill of Materials
Designator Description Manufacturer Mfg. Part Number
C1, C6 CAP, CERM, 0.1 µF, 50 V,+/- 10%, X7R, 1206 AVX 12065C104KAT2A
C2, C5 CAP, CERM, 4.7 µF, 25 V,+/- 20%, X5R, 1206 AVX 12063D475MAT2A
C3 CAP, CERM, 0.022 µF, 50 V, +/- 1%, C0G/NP0, 0805 Kemet C0805C223F5GACTU
C4, C8, C9, C10 CAP, CERM, 10 µF, 16 V, +/- 10%, X5R, 0805 Taiyo Yuden EMK212BJ106KG-T
C7, C15, C16 CAP, CERM, 0.1 µF, 50 V, +/- 10%, X7R, 0603 AVX 06035C104KAT2A
C11 CAP, CERM, 0.1 µF, 25 V, +/- 10%, X7R, 0805 Kemet C0805C104K3RACTU
C12 CAP, CERM, 100 pF, 10 V, +/- 10%, X7R, 0603 AVX 0603ZC101KAT2A
C13, C14 CAP, CERM, 1000 pF, 10 V, +/- 10%, X7R, 0603 AVX 0603ZC102KAT2A
D1, D2 Diode, Schottky, 20V, 0.5A, SOD-123 ON Semiconductor MBR0520LT1G
J1 Terminal Block, 3.5mm Pitch, 3x1, TH On-Shore Technology ED555/3DS
J2, J3, J4, J6 Terminal Block, 3.5mm Pitch, 2x1, TH On-Shore Technology ED555/2DS
J5, J8 Header, 2mm, 3x1, Tin, TH Samtec TMM-103-01-T-S
J7 Header, 50mil, 2x1, Gold, TH Sullins Connector
Solutions GRPB021VWVN-RC
R4 RES, 10.0 k, 1%, 0.25 W, 1206 Vishay-Dale CRCW120610K0FKEA
R5, R6, R7, R9, R10,
R11 RES, 10.0 k, 1%, 0.1 W, 0603 Vishay-Dale CRCW060310K0FKEA
R8 RES, 1.10 k, 1%, 0.1 W, 0603 Vishay-Dale CRCW06031K10FKEA
T1 Transformer, 340uH, SMT Wurth Elektronik 750313769
TP1, TP2, TP3, TP4 Terminal, Turret, TH, Double Keystone 1502-2
U1 Precision, 2-V Input, Reinforced Isolated Amplifier, DWV0008A
(SOIC-8) Texas Instruments AMC1311DWVR
U2 Single Output LDO, 150 mA, Fixed 5 V Output, 2.5 to 24 V
Input, with Ultra-Low IQ, 5-pin SOT-23 (DBV), -40 to 125 degC,
Green (RoHS & no Sb/Br)
Texas Instruments TLV70450DBVT
U3 Transformer Driver for Isolated Power Supplies, DBV0005A Texas Instruments SN6501DBVR
U4, U5 Low-Power, Rail-to-Rail In/Out, 1-MHz Operational Amplifier for
Cost-Sensitive Systems, DCK0005A (SOT-5) Texas Instruments TLV6001IDCKR
R1, R2, R3 Not Installed

GND1
GND2
GND2
20V
D2
20V
D1
VDD2
GND2
VDD2
10µF
C8
GND2
10µF
C10
GND1
10µF
C4
VDD2
GND1
VDD1
VDD1
GND1
1
GND
OUT
3IN 2
NC 4 NC
5
U2 TLV70450DBVT
GND1
0.1µF
C6
4.7µF
C5
0.1µF
C11
GND1
10µF
C9
0.022µF
C3
2
6
3
1
4
5
T1
1 2 3
J5
D1
1
VCC
2
D2
3GND 4
GND 5
U3
SN6501DBVR
1
2
3
J1
1
2
J4
1
2
J3
GND1
10.0k
R4
10.0k
R10
10.0k
R5
10.0k
R7
10.0k
R9
VDD2
GND2
VDD2
GND2
10.0k
R6
1.10k
R8
VDD2
GND2
GND2
3
1
2
4
5
V+
V-
U4
TLV6001IDCKR
3
1
2
4
5
V+
V-
U5
TLV6001IDCKR
J7
R1 R2
R3
TP1
10.0k
R11
100pF
C12
1000pF
C13
1000pF
C14
0.1µF
C15
VDD2
GND2
0.1µF
C16
0.1µF
C7
1
2
J2
1
2
J6
SH-J5
SH-J7
TP2
TP3
User Installed Options
VINP
GND1
Shut Down
VOUTP
3.0 V to 5.5 V
VOUTN
VOUT
GND2
GND2
VDD1
GND1
VDD2
3.0 V to 5.5 V
1 2 3
J8
SH-J8
TP4
0.1µF
C1
4.7µF
C2
VDD1
1
VINP
2
SHTDN
3
GND1
4GND2 5
VOUTN 6
VOUTP 7
VDD2 8
U1
AMC1311BDWVR
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6.2 Schematic
Figure 6. AMC1311EVM Schematic

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7 Related Documentation
To obtain a copy of any of the following TI documents, call the Texas Instruments Literature Response
Center at [phone] or the Product Information Center (PIC) at [phone]. When ordering,
please identify this booklet by its title and literature number. Updated documents can also be obtained
through our website at www.ti.com/.
•AMC1311 Precision, 2-V Input, Reinforced Isolated Amplifier, SBAS786
•SN6501 Transformer Driver for Isolated Power Supplies, SLLSEA0
•TLV600x Low-Power, Rail-to-Rail In/Out, 1-MHz Op Amp for Cost-Sen, SBOS779

STANDARD TERMS FOR EVALUATION MODULES
1. Delivery: TI delivers TI evaluation boards, kits, or modules, including any accompanying demonstration software, components, and/or
documentation which may be provided together or separately (collectively, an “EVM” or “EVMs”) to the User (“User”) in accordance
with the terms set forth herein. User's acceptance of the EVM is expressly subject to the following terms.
1.1 EVMs are intended solely for product or software developers for use in a research and development setting to facilitate feasibility
evaluation, experimentation, or scientific analysis of TI semiconductors products. EVMs have no direct function and are not
finished products. EVMs shall not be directly or indirectly assembled as a part or subassembly in any finished product. For
clarification, any software or software tools provided with the EVM (“Software”) shall not be subject to the terms and conditions
set forth herein but rather shall be subject to the applicable terms that accompany such Software
1.2 EVMs are not intended for consumer or household use. EVMs may not be sold, sublicensed, leased, rented, loaned, assigned,
or otherwise distributed for commercial purposes by Users, in whole or in part, or used in any finished product or production
system.
2Limited Warranty and Related Remedies/Disclaimers:
2.1 These terms do not apply to Software. The warranty, if any, for Software is covered in the applicable Software License
Agreement.
2.2 TI warrants that the TI EVM will conform to TI's published specifications for ninety (90) days after the date TI delivers such EVM
to User. Notwithstanding the foregoing, TI shall not be liable for a nonconforming EVM if (a) the nonconformity was caused by
neglect, misuse or mistreatment by an entity other than TI, including improper installation or testing, or for any EVMs that have
been altered or modified in any way by an entity other than TI, (b) the nonconformity resulted from User's design, specifications
or instructions for such EVMs or improper system design, or (c) User has not paid on time. Testing and other quality control
techniques are used to the extent TI deems necessary. TI does not test all parameters of each EVM.
User's claims against TI under this Section 2 are void if User fails to notify TI of any apparent defects in the EVMs within ten (10)
business days after delivery, or of any hidden defects with ten (10) business days after the defect has been detected.
2.3 TI's sole liability shall be at its option to repair or replace EVMs that fail to conform to the warranty set forth above, or credit
User's account for such EVM. TI's liability under this warranty shall be limited to EVMs that are returned during the warranty
period to the address designated by TI and that are determined by TI not to conform to such warranty. If TI elects to repair or
replace such EVM, TI shall have a reasonable time to repair such EVM or provide replacements. Repaired EVMs shall be
warranted for the remainder of the original warranty period. Replaced EVMs shall be warranted for a new full ninety (90) day
warranty period.
3Regulatory Notices:
3.1 United States
3.1.1 Notice applicable to EVMs not FCC-Approved:
FCC NOTICE: This kit is designed to allow product developers to evaluate electronic components, circuitry, or software
associated with the kit to determine whether to incorporate such items in a finished product and software developers to write
software applications for use with the end product. This kit is not a finished product and when assembled may not be resold or
otherwise marketed unless all required FCC equipment authorizations are first obtained. Operation is subject to the condition
that this product not cause harmful interference to licensed radio stations and that this product accept harmful interference.
Unless the assembled kit is designed to operate under part 15, part 18 or part 95 of this chapter, the operator of the kit must
operate under the authority of an FCC license holder or must secure an experimental authorization under part 5 of this chapter.
3.1.2 For EVMs annotated as FCC – FEDERAL COMMUNICATIONS COMMISSION Part 15 Compliant:
CAUTION
This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not
cause harmful interference, and (2) this device must accept any interference received, including interference that may cause
undesired operation.
Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to
operate the equipment.
FCC Interference Statement for Class A EVM devices
NOTE: This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of
the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is
operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not
installed and used in accordance with the instruction manual, may cause harmful interference to radio communications.
Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to
correct the interference at his own expense.