AVDD

DGND

AGND

DVDD

DS

Modulator

DATA

VINP

VINN

2.5V

Ref

CLKIN

Product

Folder

Sample &

Buy

Technical

Documents

Tools &

Software

Support &

Community

AMC1204, AMC1204B

SBAS512E – APRIL 2011 – REVISED SEPTEMBER 2015

AMC1204 20-MHz, Second-Order, Isolated Delta-Sigma Modulator

for Current-Shunt Measurement

1 Features

3 Description

The AMC1204 and AMC1204B are 1-bit digital

1

•

±250-mV Input Voltage Range Optimized for

output, isolated delta-sigma (

ΔΣ) modulators that can

Shunt Resistors

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

•

Certified Digital Isolation:

the modulator output is provided by a silicon dioxide

–

CSA, VDE V 0884-10, and UL1577 Approved

interference. This barrier has been certified to provide

–

basic

galvanic

isolation

of

up

to

4000

–

–

Transient Immunity: 15 kV/µs

to UL1577, VDE V 0884-10, 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: 84 dB (Minimum)

and other industrial applications. The AMC1204 and

AMC1204B differential inputs easily connect to the

–

THD: –80 dB (Maximum)

shunt resistor or other low-level signal sources. An

•

Excellent DC Precision:

internal reference eliminates the need for external

–

INL: ±8LSB (Maximum)

components. When used with an appropriate external

–

Gain Error: ±2% (Maximum)

digital filter, an effective number of bits (ENOB) of 14

is achieved at a data rate of 78 kSPS.

•

External Clock Input for Easier Synchronization

•

Fully Specified Over the Extended Industrial

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

modulator while the isolated digital interface operates

Temperature Range

from a 3-V, 3.3-V, or 5-V supply (DVDD). The

AMC1204 and AMC1204B are available in SOIC-16

2 Applications

(DW) and SOIC-8 (DWV) packages and are specified

•

Shunt Resistor Based Current Sensing in:

from –40°C to 105°C.

–

Motor Control

Device Information(1)

–

Green Energy

PART NUMBER

PACKAGE

BODY SIZE (NOM)

–

Inverter Applications

SOIC (16)

10.30 mm × 7.50 mm

–

Uninterruptible Power Supplies

AMC1204

SOIC (8)

5.85 mm × 7.50 mm

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

Simplified Schematic

1

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.