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ACPL-C799 Datasheet Preview

ACPL-C799 Datasheet

Sigma-Delta Modulator

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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
-1-




Broadcom

ACPL-C799 Datasheet Preview

ACPL-C799 Datasheet

Sigma-Delta Modulator

No Preview Available !

ACPL-C799
Data Sheet
Functional Block Diagram
Figure 1 Functional Block Diagram
VDD1
VIN+
VIN-
BUF
G
ȉ-Ǽ
MODULATOR/
ENCODER
LED
DRIVER
BUF
DECODER
SHIELD
VDD2
MCLK
MDAT
GND1
VREF BUF
CLK
GND2
Pin Configurations and Descriptions
Figure 2 Pin Configuration
VDD1
VIN+
VIN
GND1
1
2
3
4
ACPL-C799
8 VDD2
7 MCLK
6 MDAT
5 GND2
Functional Block Diagram
Table 1 Pin Descriptions
Pin No.
Symbol
1 VDD1
2 VIN+
3 VIN-
4 GND1
5 GND2
6 MDAT
7 MCLK
8 VDD2
Description
Supply voltage for signal input side (analog side), relative to GND1
Positive analog input, recommended input range ±50 mV
Negative analog input, recommended input range ±50 mV (normally connected to GND1)
Supply ground for signal input side
Supply ground for data/clock output side (digital side)
Modulator data output
Modulator clock output
Supply voltage for data output side, relative to GND2
Broadcom
-2-


Part Number ACPL-C799
Description Sigma-Delta Modulator
Maker Broadcom
Total Page 16 Pages
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