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AVAGO - Miniature Isolation Amplifiers

Numéro de référence ACPL-C784
Description Miniature Isolation Amplifiers
Fabricant AVAGO 
Logo AVAGO 





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ACPL-C784 fiche technique
ACPL-C78A, ACPL-C780, ACPL-C784
Miniature Isolation Amplifiers
Data Sheet
Description
The ACPL-C78A/C780/C784 isolation amplifier family was
designed for current sensing in electronic motor drives. In
a typical implementation, motor currents flow through an
external resistor and the resulting analog voltage drop is
sensed by the ACPL-C78A/C780/C784. A differential output
voltage is created on the other side of the ACPL-C78A/
C780/C784 optical isolation barrier. This differential output
voltage is proportional to the motor current and can be
converted to a single-ended signal by using an op-amp
as shown in the recommended application circuit. Since
common-mode voltage swings of several hundred volts
in tens of nanoseconds are common in modern switching
inverter motor drives, the ACPL-C78A/C780/C784 was
designed to ignore very high common-mode transient
slew rates (of at least 10 kV/µs).
The high CMR capability of the ACPL-C78A/C780/C784
isolation amplifier provides the precision and stability
needed to accurately monitor motor current in high noise
motor control environments, providing for smoother
control (less “torque ripple”) in various types of motor
control applications.
The product can also be used for general analog signal
isolation applications requiring high accuracy, stability,
and linearity under similarly severe noise conditions. For
general applications, we recommend the ACPL-C780 (gain
tolerance of ±3%) and the ACPL-C784 (gain tolerance of
±5%). For precision applications AvagoTechnologies offers
the ACPL-C78A with part-to-part gain tolerance of ±1%.
The ACPL-C78A/C780/C784 utilizes sigma-delta (∑-∆) an-
alog-to-digital converter technology, chopper stabilized
amplifiers, and a fully differential circuit topology.
Together, these features deliver unequaled isolation-
mode noise rejection, as well as excellent offset and gain
accuracy and stability over time and temperature. This
performance is delivered in a compact, auto-insertable,
Stretched SO-8 (SSO-8) package that meets worldwide
regulatory safety standards.
Features
15 kV/µs Common-Mode Rejection at VCM = 1000 V
Compact, Auto-Insertable Stretched SO-8 Package
0.00025 V/V/°C Gain Drift vs. Temperature
0.3 mV Input Offset Voltage
100 kHz Bandwidth
0.004% Nonlinearity
Worldwide Safety Approval: UL 1577 (5000Vrms/1 min.),
CSA and IEC/EN/DIN EN 60747-5-2
Advanced Sigma-Delta (∑-∆) A/D Converter Technology
Fully Differential Amplifier
Applications
Motor Phase and Rail Current Sensing
Inverter Current Sensing
Switched Mode Power Supply Signal Isolation
General Purpose Current Sensing and Monitoring
General Purpose Analog Signal Isolation
Functional Diagram
IDD1
VDD1 1
IDD2
8 VDD2
VIN+ 2
VIN- 3
GND1 4
++
--
SHIELD
7 VOUT+
6 VOUT-
5 GND2
NOTE: A 0.1 μF bypass capacitor must be connected between pins 1 and
4 and between pins 5 and 8.
CAUTION: It is advised that normal static precautions be taken in handling and assembly
of this component to prevent damage and/or degradation which may be induced by ESD.
Free Datasheet http://www.datasheet-pdf.com/

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