1

FEATURES

DESCRIPTION

APPLICATIONS

Output

Buffer

V

REF

+

-

+

-

MDAT

MCLK

Output

Buffer

V

REF

+

-

+

-

POR

BIAS

POR

IsolationBarrier

2nd-Order

DS Modulator

20MHz

RC

Oscillator

V

IN+

V

IN-

Buffer

2.5V

V

REF

AMC1203

SBAS427 – FEBRUARY 2008

www.ti.com

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

2

• 16-Bit Resolution

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

(

ΔΣ) modulator with an output buffer separated from

• SNR: 80.5dB min

• THD: –88dB max (AMC1203B)

isolation

barrier.

This

barrier

provides

galvanic

• ±280mV Input Range with +5V Supply

• Internal 2.5V Reference Voltage: 1% Accuracy

isolated power supplies, these devices prevent noise

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

–

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

digital filter and modulator rate, the device can be

• Typical 25-Year Life at Rated Working Voltage

used

to

achieve

16-bit

analog-to-digital

(A/D)

(see Application Report SLLA197)

conversion with no missing codes. An effective

• Operating Temperature Range:

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

–40

°C to +105°C

ratio of 256.

The modulator output is translated to a balanced

• Shunt Based Current Sensing in:

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,

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

–

Power Inverters

circuit accordingly.

–

Industrial Process Control

The AMC1203 is available in an SO-8 gull-wing

package. SO-8 and SO-16 packages are planned for

release in 2008. The AMC1203 is characterized for

operation over the ambient temperature range of

–40

°C to +105°C.

1

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.

2

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2008, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.