ACPL-C799 Datasheet, PDF (1/16 Pages) Broadcom Corporation. – Optically Isolated ±50 mV Sigma-Delta Modulator

ACPL-C799
Optically Isolated ±50 mV Sigma-Delta Modulator
Data Sheet
Description
The Avago Technologies’ ACPL-C799 is a 1-bit, second-order
sigma-delta (-) modulator converts an analog input signal
into a high-speed data stream with galvanic isolation based on
optical coupling technology. The ACPL-C799 operates from a
5V power supply with dynamic range of 77 dB with an
appropriate digital filter. The differential inputs of ±50 mV (full
scale ±80 mV) are ideal for direct connection to shunt resistors
or other low-level signal sources in applications, such as motor
phase current measurement.
The analog input is continuously sampled by a means of
sigma-delta over-sampling using an on-board clock. The signal
information is contained in the modulator data, as a density of
ones with data rate of 10 MHz, and the data are encoded and
transmitted across the isolation boundary where they are
recovered and decoded into high-speed data stream of digital
ones and zeros. The original signal information can be
reconstructed with a digital filter. The serial interface for data
and clock has a wide supply range of 3V to 5.5V.
Combined with superior optical coupling technology, the
modulator delivers high noise margins and excellent immunity
against isolation-mode transients. With 0.5 mm minimum
distance through insulation (DTI), the ACPL-C799 provides
reliable reinforced insulation and high working insulation
voltage, which is suitable for fail-safe designs. This outstanding
isolation performance is superior to alternatives including
devices based on capacitive- or magnetic-coupling with DTI in
micro-meter range. Offered in a Stretched SO-8 (SSO-8)
package, the isolated ADC delivers the reliability, small size,
superior isolation and over-temperature performance motor
drive designers need to accurately measure current at much
lower price compared to traditional current transducers.
Features
 10-MHz internal clock
 1-bit, second-order sigma-delta modulator
 16 bits resolution no missing codes (12 bits ENOB)
 77 dB SNR typ
 1.3 μV/°C maximum offset drift
 ±1% gain error
 Internal reference voltage
 ±50 mV linear range with single 5 V supply (±80 mV full scale)
 3V to 5.5V wide supply range for digital interface
 –40°C to +105°C operating temperature range
 SSO-8 package
 25 kV/μs common-mode transient immunity
 Safety and regulatory approval:
— IEC/EN/DIN EN 60747-5-5: 1414 Vpeak working
insulation voltage
— UL 1577: 5000 Vrms/1 min isolation voltage
— CSA: Component Acceptance Notice #5
Applications
 Motor phase and rail current sensing
 Power inverter current sensing
 Industrial process control
 Data acquisition systems
 General purpose current sensing
 Traditional current transducer replacements
CAUTION
It is advised that normal static precautions be
taken in handling and assembly of this
component to prevent damage and/or
degradation that may be induced by ESD. The
components featured in this data sheet are not
to be used in military or aerospace applications
or environments.
Broadcom
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