Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsData collecting ICsData acquisition IC - AD converter (ADC) Internal SOP 8

Output

Buffer

REF

MDAT

MCLK

Output

Buffer

REF

PORBIASPOR

IsolationBarrier

2nd-Order

DS Modulator

20MHz

Oscillator

IN+

IN-

Buffer

2.5V

REF

InterfaceCircuit

AMC1203

www.ti.com

SBAS427C –FEBRUARY 2008– REVISED JUNE 2011

1-Bit, 10MHz, 2nd-Order, Isolated Delta-Sigma Modulator

Check for Samples: AMC1203

FEATURES

DESCRIPTION

The AMC1203 is a 1-bit, 10MHz, isolated delta-sigma

• 16-Bit Resolution

(ΔΣ) modulator with an output buffer separated from

• SNR: 80.5dB min

the input interface circuitry by a silicon dioxide (SiO

)

• THD: –88dB max (AMC1203B)

isolation barrier. This barrier provides galvanic

• ±280mV Input Range with +5V Supply

isolation of up to 4000V

PEAK

. Used in conjunction with

isolated power supplies, these devices prevent noise

• Internal 2.5V Reference Voltage: 1% Accuracy

currents on a data bus or other circuits from entering

• Gain Error: ±1% (AMC1203B)

the local ground and interfering with or damaging

• UL1577, IEC60747-5-2 (VDE0884, Rev. 2), and

sensitive circuitry.

IEC61010-1 Approved

The AMC1203 modulator operates from a +5V supply

– Isolation: 4000V

PEAK

with a dynamic range of 95dB. The differential inputs

Working Voltage: 560V

are ideal for direct connection to shunt resistors or

– Transient Immunity: 15kV/μs

other low-level signal sources. With the appropriate

• Typical 25-Year Life at Rated Working Voltage

digital filter and modulator rate, the device can be

(see Application Report SLLA197)

used to achieve 16-bit analog-to-digital (A/D)

• Specified Temperature Range:

conversion with no missing codes. An effective

–40°C to +105°C

resolution of 14 bits and an SNR of 85dB (typical)

can be maintained with a sinc

filter with a decimation

APPLICATIONS

ratio of 256.

• Shunt Based Current Sensing in:

The modulator output is translated to a balanced

signal and then transferred by the capacitive isolation

– Motor Control

barrier. Across the isolation barrier, a differential

– Uninterruptible Power Supplies

comparator receives the logic transition information,

– Power Inverters

and then sets or resets a flip-flop and the output

– Industrial Process Control

circuit accordingly.

The AMC1203 is available in SOP-8 gull-wing,

SOP-8, and SOIC-16 packages. The AMC1203 is

characterized for operation over the ambient

temperature range of –40°C to +105°C.

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 (27 pages)

PAGE 1
AMC1203 SBAS427C – FEBRUARY 2008 – REVISED JUNE 2011 www.ti.com 1-Bit, 10MHz, 2nd-Order, Isolated Delta-Sigma Modulator Check for Samples: AMC1203 FEATURES DESCRIPTION • • • • • • • The AMC1203 is a 1-bit, 10MHz, isolated delta-sigma (ΔΣ) modulator with an output buffer separated from the input interface circuitry by a silicon dioxide (SiO2) isolation barrier. This barrier provides galvanic isolation of up to 4000VPEAK.
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AMC1203 SBAS427C – FEBRUARY 2008 – REVISED JUNE 2011 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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AMC1203 SBAS427C – FEBRUARY 2008 – REVISED JUNE 2011 www.ti.com THERMAL CHARACTERISTICS (1) Over recommended operating conditions, unless otherwise noted.
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AMC1203 SBAS427C – FEBRUARY 2008 – REVISED JUNE 2011 www.ti.com PACKAGE CHARACTERISTICS (1) Over recommended operating conditions, unless otherwise noted. PARAMETER L(I01) L(I02) Minimum air gap (clearance) Minimum external tracking (creepage) TEST CONDITIONS Shortest terminal to terminal distance through air Shortest terminal to terminal distance across the package surface MIN RIO MAX UNIT DUB 7 mm DW 8 mm PSA 6.3 mm DUB 7 mm 8 mm 6.
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AMC1203 SBAS427C – FEBRUARY 2008 – REVISED JUNE 2011 www.ti.com ELECTRICAL CHARACTERISTICS At TA = –40°C to +105°C, VDD1 = 4.5V to 5.5V, VDD2 = 4.5V to 5.5V, VIN+ = –280mV to +280mV, VIN– = 0V, and sinc3 filter with OSR = 256, unless otherwise noted.
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AMC1203 SBAS427C – FEBRUARY 2008 – REVISED JUNE 2011 www.ti.com ELECTRICAL CHARACTERISTICS (continued) At TA = –40°C to +105°C, VDD1 = 4.5V to 5.5V, VDD2 = 4.5V to 5.5V, VIN+ = –280mV to +280mV, VIN– = 0V, and sinc3 filter with OSR = 256, unless otherwise noted. AMC1203 MIN TYP (1) IOH = –8mA VDD2 – 0.8 4.6 IOH = –4mA VDD2 – 0.4 4.8 PARAMETER TEST CONDITIONS MAX UNIT DIGITAL OUTPUTS VOH VOL High-level output voltage Low-level output voltage V V IOL = 8mA 0.3 0.8 V IOL = 4mA 0.2 0.
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AMC1203 SBAS427C – FEBRUARY 2008 – REVISED JUNE 2011 www.ti.com PIN CONFIGURATION DUB or PSA PACKAGE SOP-8 Gull-Wing or SOP-8 (TOP VIEW) VDD1 1 VIN+ 2 DW PACKAGE SOIC-16 (TOP VIEW) 8 VDD2 VDD1 1 16 GND2 7 MCLK VIN+ 2 15 NC 14 VDD2 AMC1203 VIN- 3 6 MDAT VIN- 3 GND1 4 5 GND2 GND1 4 13 MCLK AMC1203 Table 1. SOP-8 PIN DESCRIPTIONS PIN NO.
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AMC1203 SBAS427C – FEBRUARY 2008 – REVISED JUNE 2011 www.ti.com TIMING INFORMATION tCLK tHIGH MCLK tD tS tH MDAT Figure 2. Modulator Output Mode Timing TIMING CHARACTERISTICS FOR MODULATOR OUTPUT MODE Over recommended operating free-air temperature range at –40°C to +105°C, VDD1 = +5V, and VDD2 = +5V, unless otherwise noted. PARAMETER MIN TYP MAX UNIT 83.
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AMC1203 SBAS427C – FEBRUARY 2008 – REVISED JUNE 2011 www.ti.com TYPICAL CHARACTERISTICS At VDD1 = VDD2 = 5V, VIN+ = –280mV to +280mV, VIN– = 0V, and sinc3 filter with OSR = 256, unless otherwise noted. INTEGRAL NONLINEARITY vs INPUT SIGNAL AMPLITUDE INTEGRAL NONLINEARITY vs TEMPERATURE 6 3 5 4 2 3 1 INL (LSB) INL (LSB) 2 1 0 -1 -2 0 -1 -3 -4 -2 -5 -6 -300 -3 -200 -100 0 VIN (mV) 100 200 300 OFFSET ERROR vs SUPPLY VOLTAGE OFFSET ERROR vs TEMPERATURE 0.5 0.15 0.4 95 110 125 0.3 0.
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AMC1203 SBAS427C – FEBRUARY 2008 – REVISED JUNE 2011 www.ti.com TYPICAL CHARACTERISTICS (continued) At VDD1 = VDD2 = 5V, VIN+ = –280mV to +280mV, VIN– = 0V, and sinc3 filter with OSR = 256, unless otherwise noted. SIGNAL-TO-NOISE RATIO vs INPUT SIGNAL AMPLITUDE SIGNAL-TO-NOISE RATIO vs TEMPERATURE 100 90 fIN = 500Hz 89 90 87 70 86 SNR (dB) SNR (dB) 88 80 60 85 84 83 50 82 40 81 30 80 1 10 100 1000 VIN (mVPP) 20 35 50 65 Temperature (°C) Figure 9. Figure 10.
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AMC1203 SBAS427C – FEBRUARY 2008 – REVISED JUNE 2011 www.ti.com TYPICAL CHARACTERISTICS (continued) At VDD1 = VDD2 = 5V, VIN+ = –280mV to +280mV, VIN– = 0V, and sinc3 filter with OSR = 256, unless otherwise noted. FREQUENCY SPECTRUM (4096 Point FFT, fIN = 1kHz, 0.56VPP) 0 0 -20 -20 -40 -40 Magnitude (dB) Magnitude (dB) FREQUENCY SPECTRUM (4096 Point FFT, fIN = 500Hz, 0.
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AMC1203 SBAS427C – FEBRUARY 2008 – REVISED JUNE 2011 www.ti.com TYPICAL CHARACTERISTICS (continued) At VDD1 = VDD2 = 5V, VIN+ = –280mV to +280mV, VIN– = 0V, and sinc3 filter with OSR = 256, unless otherwise noted. ANALOG SUPPLY CURRENT vs TEMPERATURE DIGITAL SUPPLY CURRENT vs TEMPERATURE 6.5 10.0 9.5 6.0 IDD2 (mA) IDD1 (mA) 9.0 5.5 5.0 8.5 8.0 4.5 7.5 4.0 7.0 -40 -25 -10 5 20 35 50 65 Temperature (°C) Figure 21.
PAGE 13
AMC1203 SBAS427C – FEBRUARY 2008 – REVISED JUNE 2011 www.ti.com GENERAL DESCRIPTION The AMC1203 is a single-channel, 2nd-order, CMOS, delta-sigma modulator, designed for medium- to high-resolution A/D conversions from dc to 39kHz with an oversampling ratio (OSR) of 256. The isolated output of the converter (MDAT) provides a stream of digital ones and zeros. The time average of this serial output is proportional to the analog input voltage.
PAGE 14
AMC1203 SBAS427C – FEBRUARY 2008 – REVISED JUNE 2011 www.ti.com THEORY OF OPERATION The differential analog input of the AMC1203 is implemented with a switched-capacitor circuit. This switched-capacitor circuit implements a 2nd-order modulator stage that digitizes the input signal into a 1-bit output stream. The internally-generated clock signal (sourcing the capacitor circuit and the modulator) is available as an output signal on the MCLK pin.
PAGE 15
AMC1203 SBAS427C – FEBRUARY 2008 – REVISED JUNE 2011 www.ti.com DIGITAL OUTPUT 0 The system clock of the AMC1203 is 20 MHz by default, and is generated internally using an RC circuit. The system clock is divided by two for the modulator clock; thus, the default clock frequency of the modulator is 10MHz. This clock is also available on the output terminal MCLK, whereas the data are provided at the MDAT output pin.
PAGE 16
AMC1203 SBAS427C – FEBRUARY 2008 – REVISED JUNE 2011 www.ti.com In motor-control applications, a very fast response time for the over-current detection is required. The time for full settling of the filter depends on its order (that is, a sinc3 filter requires three data clocks for full settling (with fDATA = fMOD/OSR). Therefore, for over-current protection, filter types other than sinc3 might be a better choice; an alternative is the sinc2 filter.
PAGE 17
AMC1203 SBAS427C – FEBRUARY 2008 – REVISED JUNE 2011 www.ti.com APPLICATION INFORMATION A typical operation of the AMC1203 in a motor-control application is shown in Figure 30. Measurement of the motor phase current is done via the shunt resistor ®SHUNT; in this case, a 2-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.
PAGE 18
AMC1203 SBAS427C – FEBRUARY 2008 – REVISED JUNE 2011 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. the leakage current produces an overvoltage at the site of the discontinuity, and an electric spark is generated.
PAGE 19
AMC1203 SBAS427C – FEBRUARY 2008 – REVISED JUNE 2011 www.ti.com REVISION HISTORY NOTE: Page numbers for previous revisions may differ from page numbers in the current version. Changes from Revision B (May 2010) to Revision C Page • Changed text in Features bullet from "Operating" to "Specified" for temperature range ..................................................... 1 • Changed Minimum Air Gap parameter in Package Characteristics table to show values for all packages .........................
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PACKAGE OPTION ADDENDUM www.ti.
PAGE 21
PACKAGE OPTION ADDENDUM www.ti.com 11-Apr-2013 LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.