Datasheet

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AVDD

DGND

AGND

DVDD

Modulator

DATA

IsolationBarrier

VINP

VINN

2.5V

Ref

CLKIN

AMC1204

AMC1204B

www.ti.com

SBAS512D –APRIL 2011–REVISED DECEMBER 2013

20MHz, Second-Order, Isolated Delta-Sigma Modulator

for Current-Shunt Measurement

Check for Samples: AMC1204, AMC1204B

FEATURES

DESCRIPTION

The AMC1204 and AMC1204B are 1-bit digital

• ±250mV Input Voltage Range Optimized for

output, isolated delta-sigma (ΔΣ) modulators that can

Shunt Resistors

be clocked at up to 20MHz. The digital isolation of the

• Certified Digital Isolation:

modulator output is provided by a silicon dioxide

– CSA, IEC60747-5-5, and UL1577 Approved

(SiO

) barrier that is highly resistant to magnetic

interference. This barrier has been certified to provide

– Isolation Voltage: 4250V

PEAK

(AMC1204B)

basic galvanic isolation of up to 4000V

PEAK

– Working Voltage: 1200V

PEAK

(AMC1204) and 4250V

PEAK

(AMC1204B) according to

– Transient Immunity: 15kV/µs

UL1577, IEC60747-5-5, and CSA standards or

specifications.

• Long Isolation Barrier Lifetime

(see Application Report SLLA197)

The AMC1204 and AMC1204B provide a single-chip

solution for measuring the small signal of a shunt

• High Electromagnetic Field Immunity

resistor across an isolated barrier. These types of

(see Application Note SLLA181A )

resistors are typically used to sense currents in motor

• Outstanding AC Performance:

control inverters, green energy generation systems,

– SNR: 84dB (min)

and other industrial applications. The AMC1204 and

AMC1204B differential inputs easily connect to the

– THD: –80dB (max)

shunt resistor or other low-level signal sources. An

• Excellent DC Precision:

internal reference eliminates the need for external

– INL: ±8LSB (max)

components. When used with an appropriate external

– Gain Error: ±2% (max) digital filter, an effective number of bits (ENOB) of 14

is achieved at a data rate of 78kSPS.

• External Clock Input for Easier

Synchronization

A 5V analog supply (AVDD) is used by the modulator

while the isolated digital interface operates from a 3V,

• Fully Specified Over the Extended Industrial

3.3V, or 5V supply (DVDD). The AMC1204 and

Temperature Range

AMC1204B are available in SO-16 (DW) and SSO-8

(DWV) packages and are specified from –40°C to

APPLICATIONS

+105°C.

• Shunt Resistor Based Current Sensing in:

– Motor Control

– Green Energy

– Inverter Applications

– Uninterruptible Power Supplies

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (32 pages)

PAGE 1
AMC1204 AMC1204B www.ti.com SBAS512D – APRIL 2011 – REVISED DECEMBER 2013 20MHz, Second-Order, Isolated Delta-Sigma Modulator for Current-Shunt Measurement Check for Samples: AMC1204, AMC1204B FEATURES DESCRIPTION • The AMC1204 and AMC1204B are 1-bit digital output, isolated delta-sigma (ΔΣ) modulators that can be clocked at up to 20MHz. The digital isolation of the modulator output is provided by a silicon dioxide (SiO2) barrier that is highly resistant to magnetic interference.
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AMC1204 AMC1204B SBAS512D – APRIL 2011 – REVISED DECEMBER 2013 www.ti.com This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure.
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AMC1204 AMC1204B www.ti.com SBAS512D – APRIL 2011 – REVISED DECEMBER 2013 REGULATORY INFORMATION VDE/IEC CSA UL Certified according to IEC60747-5-5 Approved under CSA component acceptance notice Recognized under 1577 component recognition program File number: 40016131 File number: 2350550 File number: E181974 IEC SAFETY LIMITING VALUES Safety limiting intends to prevent potential damage to the isolation barrier upon failure of input or output (I/O) circuitry.
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AMC1204 AMC1204B SBAS512D – APRIL 2011 – REVISED DECEMBER 2013 www.ti.
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AMC1204 AMC1204B www.ti.com SBAS512D – APRIL 2011 – REVISED DECEMBER 2013 ELECTRICAL CHARACTERISTICS All minimum/maximum specifications at TA = –40°C to +105°C, AVDD = 4.5V to 5.5V, DVDD = 2.7V to 5.5V, VINP = –250mV to +250mV, VINN = 0V, and sinc3 filter with OSR = 256, unless otherwise noted. Typical values are at TA = +25°C, AVDD = 5V, and DVDD = 3.3V.
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AMC1204 AMC1204B SBAS512D – APRIL 2011 – REVISED DECEMBER 2013 www.ti.com ELECTRICAL CHARACTERISTICS (continued) All minimum/maximum specifications at TA = –40°C to +105°C, AVDD = 4.5V to 5.5V, DVDD = 2.7V to 5.5V, VINP = –250mV to +250mV, VINN = 0V, and sinc3 filter with OSR = 256, unless otherwise noted. Typical values are at TA = +25°C, AVDD = 5V, and DVDD = 3.3V. AMC1204, AMC1204B PARAMETER TEST CONDITIONS MIN LVCMOS logic family TYP MAX UNIT LVCMOS VIH High-level input voltage DVDD = 2.
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AMC1204 AMC1204B www.ti.com SBAS512D – APRIL 2011 – REVISED DECEMBER 2013 PIN CONFIGURATIONS DW PACKAGE SO-16 (TOP VIEW) DWV PACKAGE SSO-8 (TOP VIEW) AVDD 1 16 DGND VINP 2 15 NC VINN 3 14 DVDD AGND 4 13 CLKIN (1) 5 12 NC NC 6 11 DATA NC 7 10 NC AGND 8 9 NC AVDD 1 8 DVDD VINP 2 7 CLKIN VINN 3 6 DATA 4 5 DGND AGND DGND (1) NC = no internal connection.
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AMC1204 AMC1204B SBAS512D – APRIL 2011 – REVISED DECEMBER 2013 www.ti.com TYPICAL CHARACTERISTICS At AVDD = 5V, DVDD = 3.3V, VINP = –250mV to +250mV, VINN = 0V, and sinc3 filter with OSR = 256, unless otherwise noted. INTEGRAL NONLINEARITY vs INPUT SIGNAL AMPLITUDE INTEGRAL NONLINEARITY vs TEMPERATURE 8 7 5 INL (LSB) INL (LSB) 6 4 3 2 1 0 −250 −200 −150 −100 −50 0 50 100 Input Signal Amplitude (mV) 150 200 250 16 14 12 10 8 6 4 2 0 −2 −4 −6 −8 −10 −12 −14 −16 −40 −25 −10 5 Figure 2. 0.8 0.
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AMC1204 AMC1204B www.ti.com SBAS512D – APRIL 2011 – REVISED DECEMBER 2013 TYPICAL CHARACTERISTICS (continued) At AVDD = 5V, DVDD = 3.3V, VINP = –250mV to +250mV, VINN = 0V, and sinc3 filter with OSR = 256, unless otherwise noted. GAIN ERROR vs TEMPERATURE 2 1.5 1.5 1 1 Gain Error (%) Gain Error (%) GAIN ERROR vs ANALOG SUPPLY VOLTAGE 2 0.5 0 −0.5 0.5 0 −0.5 −1 −1 −1.5 −1.5 −2 4.5 5 AVDD (V) −2 −40 −25 −10 5.5 5 Figure 8. 1.5 1.5 1 1 0.5 0 −0.5 110 125 0.5 0 −0.5 −1 −1 −1.5 −1.
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AMC1204 AMC1204B SBAS512D – APRIL 2011 – REVISED DECEMBER 2013 www.ti.com TYPICAL CHARACTERISTICS (continued) At AVDD = 5V, DVDD = 3.3V, VINP = –250mV to +250mV, VINN = 0V, and sinc3 filter with OSR = 256, unless otherwise noted. SINAD AND SNR vs ANALOG SUPPLY VOLTAGE SINAD AND SNR vs TEMPERATURE 100 100 SINAD SNR 90 SINAD and SNR (dB) SINAD and SNR (dB) SINAD SNR 80 70 60 4.5 5 AVDD (V) 90 80 70 60 −40 −25 −10 5.5 5 Figure 14. 20 35 50 65 Temperature (°C) 80 95 110 125 Figure 15.
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AMC1204 AMC1204B www.ti.com SBAS512D – APRIL 2011 – REVISED DECEMBER 2013 TYPICAL CHARACTERISTICS (continued) At AVDD = 5V, DVDD = 3.3V, VINP = –250mV to +250mV, VINN = 0V, and sinc3 filter with OSR = 256, unless otherwise noted. TOTAL HARMONIC DISTORTION vs TEMPERATURE −60 −60 −70 −70 −80 −80 THD (dB) THD (dB) TOTAL HARMONIC DISTORTION vs ANALOG SUPPLY VOLTAGE −90 −90 −100 −100 −110 −110 −120 4.5 5 AVDD (V) −120 −40 −25 −10 5.5 5 20 35 50 65 Temperature (°C) 80 95 Figure 20.
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AMC1204 AMC1204B SBAS512D – APRIL 2011 – REVISED DECEMBER 2013 www.ti.com TYPICAL CHARACTERISTICS (continued) At AVDD = 5V, DVDD = 3.3V, VINP = –250mV to +250mV, VINN = 0V, and sinc3 filter with OSR = 256, unless otherwise noted. SPURIOUS-FREE DYNAMIC RANGE vs TEMPERATURE 120 120 110 110 100 100 SFDR (dB) SFDR (dB) SPURIOUS-FREE DYNAMIC RANGE vs ANALOG SUPPLY VOLTAGE 90 90 80 80 70 70 60 4.5 5 AVDD (V) 60 −40 −25 −10 5.5 5 20 35 50 65 Temperature (°C) 80 95 Figure 26. Figure 27.
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AMC1204 AMC1204B www.ti.com SBAS512D – APRIL 2011 – REVISED DECEMBER 2013 TYPICAL CHARACTERISTICS (continued) At AVDD = 5V, DVDD = 3.3V, VINP = –250mV to +250mV, VINN = 0V, and sinc3 filter with OSR = 256, unless otherwise noted. FREQUENCY SPECTRUM (4096 point FFT, fIN = 1kHz, 056VPP) 0 -20 -20 -40 -40 Magnitude (dB) Magnitude (dB) 0 -60 -80 -60 -80 -100 -100 -120 -120 -140 -140 0 5 10 15 20 25 30 35 40 0 15 20 25 Figure 32. Figure 33.
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AMC1204 AMC1204B SBAS512D – APRIL 2011 – REVISED DECEMBER 2013 www.ti.com TYPICAL CHARACTERISTICS (continued) At AVDD = 5V, DVDD = 3.3V, VINP = –250mV to +250mV, VINN = 0V, and sinc3 filter with OSR = 256, unless otherwise noted. DIGITAL SUPPLY CURRENT vs TEMPERATURE 16 16 14 14 12 12 IDVDD (mA) IDVDD (mA) DIGITAL SUPPLY CURRENT vs DIGITAL SUPPLY VOLTAGE (5V) 10 8 6 10 8 6 4 4 2 2 0 4.5 5 DVDD (V) DVDD = 3.3V DVDD = 5V 0 −40 −25 −10 5.5 5 20 35 50 65 Temperature (°C) Figure 38.
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AMC1204 AMC1204B www.ti.com SBAS512D – APRIL 2011 – REVISED DECEMBER 2013 GENERAL DESCRIPTION The AMC1204 and AMC1204B are single-channel, second-order, delta-sigma (ΔΣ) modulators designed for medium- to high-resolution analog-to-digital conversions. The isolated output of the converter (DATA) provides a stream of digital ones and zeros. The time average of this serial output is proportional to the analog input voltage. Figure 41 shows a detailed block diagram of the AMC1204 and AMC1204B.
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AMC1204 AMC1204B SBAS512D – APRIL 2011 – REVISED DECEMBER 2013 www.ti.com THEORY OF OPERATION The differential analog input of the AMC1204 and AMC1204B are implemented with a switched-capacitor circuit. This switched-capacitor circuit implements a second-order modulator stage that digitizes the input signal into a 1bit output stream. The externally-provided clock source at the CLKIN pin is used by the capacitor circuit and the modulator and should be in the range of 5MHz to 22MHz.
PAGE 17
AMC1204 AMC1204B www.ti.com SBAS512D – APRIL 2011 – REVISED DECEMBER 2013 MODULATOR The modulator topology of the AMC1204 and AMC1204B is fundamentally a second-order, switched-capacitor, ΔΣ modulator, such as the one conceptualized in Figure 43. The analog input voltage (X(t)) and the output of the 1-bit digital-to-analog converter (DAC) are differentiated, providing an analog voltage (X2) at the input of the first integrator or modulator stage.
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AMC1204 AMC1204B SBAS512D – APRIL 2011 – REVISED DECEMBER 2013 www.ti.com DIGITAL OUTPUT A differential input signal of 0V ideally produces a stream of ones and zeros that are high 50% of the time and low 50% of the time. A differential input of +250mV produces a stream of ones and zeros that are high 89.06% of the time. A differential input of –250mV produces a stream of ones and zeros that are high 10.94% of the time.
PAGE 19
AMC1204 AMC1204B www.ti.com SBAS512D – APRIL 2011 – REVISED DECEMBER 2013 In a sinc3 filter response (shown in Figure 46 and Figure 47), the location of the first notch occurs at the frequency of output data rate fDATA = fCLK/OSR. The –3dB point is located at half the Nyquist frequency or fDATA/4. For some applications, it may be necessary to use another filter type with different frequency response. Performance can be improved, for example, by using a cascaded filter structure.
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AMC1204 AMC1204B SBAS512D – APRIL 2011 – REVISED DECEMBER 2013 www.ti.com An example code for an implementation of a sinc3 filter in an FPGA follows. For more information, see the application note Combining ADS1202 with FPGA Digital Filter for Current Measurement in Motor Control Applications (SBAA094) , available for download at www.ti.com. library IEEE; use IEEE.std_logic_1164.all; use IEEE.std_logic_unsigned.
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AMC1204 AMC1204B www.ti.com SBAS512D – APRIL 2011 – REVISED DECEMBER 2013 APPLICATION INFORMATION A typical operation of the AMC1204 and AMC1204B in a motor control application is shown in Figure 50. Measurement of the motor phase current is done via the shunt resistor RSHUNT (in this case, a two-terminal shunt). For better performance, the differential signal is filtered using RC filters (components R2, R3, and C2). Optionally, C3 and C4 can be used to reduce charge dumping from the inputs.
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AMC1204 AMC1204B SBAS512D – APRIL 2011 – REVISED DECEMBER 2013 www.ti.com Figure 51 shows an example of two AMC1204 and AMC1204B devices and one ADS1209 (a dual-channel, 10MHz, non-isolated modulator) connected to an AMC1210, building the entire analog front-end of a resolverbased motor control application. For detailed information on the ADS1209 and AMC1210, visit the respective device product folders at www.ti.com.
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AMC1204 AMC1204B www.ti.com SBAS512D – APRIL 2011 – REVISED DECEMBER 2013 A layout recommendation showing the critical placement of the decoupling capacitor on the high-side and placement of the other components required by the AMC1204 and AMC1204B is presented in Figure 52. Top View Clearance Area Keep Free of Any Conductive Materials To Shunt 12W SMD 0603 330pF SMD 12W 0603 SMD 0603 0.1mF SMD 1206 AVDD DGND VINP NC VINN DVDD AGND NC LEGEND AMC1204, AMC1204B CLKIN 0.
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AMC1204 AMC1204B SBAS512D – APRIL 2011 – REVISED DECEMBER 2013 www.ti.com ISOLATION GLOSSARY Creepage Distance: The shortest path between two conductive input to output leads measured along the surface of the insulation. The shortest distance path is found around the end of the package body. Clearance: The shortest distance between two conductive input to output leads measured through air (line of sight).
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AMC1204 AMC1204B www.ti.com SBAS512D – APRIL 2011 – REVISED DECEMBER 2013 Pollution Degree: Pollution Degree 1—No pollution, or only dry, nonconductive pollution occurs. The pollution has no influence on device performance. Pollution Degree 2—Normally, only nonconductive pollution occurs. However, a temporary conductivity caused by condensation is to be expected. Pollution Degree 3—Conductive pollution, or dry nonconductive pollution that becomes conductive because of condensation, occurs.
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AMC1204 AMC1204B SBAS512D – APRIL 2011 – REVISED DECEMBER 2013 www.ti.com REVISION HISTORY NOTE: Page numbers for previous revisions may differ from page numbers in the current version. Changes from Revision C (August 2012) to Revision D Page • Deleted chip photo ................................................................................................................................................................ 1 • Added DWV (SSO-8) package to document ......................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 17-Jul-2013 continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
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PACKAGE MATERIALS INFORMATION www.ti.com 17-Jul-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant AMC1204BDWR SOIC DW 16 2000 330.0 16.4 10.75 10.7 2.7 12.0 16.0 Q1 AMC1204DWR SOIC DW 16 2000 330.0 16.4 10.75 10.7 2.7 12.0 16.
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PACKAGE MATERIALS INFORMATION www.ti.com 17-Jul-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) AMC1204BDWR SOIC DW 16 2000 367.0 367.0 38.0 AMC1204DWR SOIC DW 16 2000 367.0 367.0 38.
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