Broadcom ACPL 7970 500E DIP 8 Package Sigma Delta Modulator Providing Reinforced Insulation and Safety
ACPL-7970 Optically Isolated Sigma-Delta Modulator
Product Overview
The ACPL-7970 is a 1-bit, second-order sigma-delta (-) modulator that converts an analog input signal into a high-speed data stream with galvanic isolation. Leveraging optical coupling technology, it operates from a 5 V supply and offers a dynamic range of 78 dB with an appropriate digital filter. Its differential inputs of 200 mV (full scale 320 mV) are ideal for direct connection to shunt resistors or other low-level signal sources, particularly in applications like motor phase current measurement. The ACPL-7970 provides superior isolation performance with 0.5 mm minimum distance through insulation (DTI), ensuring reliable reinforced insulation and high working insulation voltage suitable for fail-safe designs. Offered in a DIP-8 package, it delivers reliability, small size, and excellent over-temperature performance for motor drive designers, serving as a cost-effective alternative to traditional current transducers.
Product Attributes
- Brand: Avago Technologies
- Package: DIP-8
- Certifications: IEC/EN/DIN EN 60747-5-5, UL 1577, CSA
Technical Specifications
| Specification | Value | Units | Conditions/Notes |
|---|---|---|---|
| Internal Clock | 10 | MHz | |
| Resolution | 16 | Bits | (12 bits ENOB) |
| SNR | 78 | dB | |
| Offset Drift vs. Temperature | 6 | mV/C | Maximum |
| Gain Error | 1 | % | Maximum |
| Linear Input Range | 200 | mV | (Full Scale 320 mV) |
| Digital Interface Supply Range | 3 to 5.5 | V | |
| Operating Temperature Range | -40 to +105 | C | |
| Common-Mode Transient Immunity | 25 | kV/ms | |
| Working Insulation Voltage (IEC/EN/DIN EN 60747-5-5) | 891 | Vpeak | |
| Isolation Voltage (UL 1577) | 5000 | Vrms/1min | |
| Supply Voltage (VDD1) | 4.5 to 5.5 | V | Recommended Operating |
| Supply Voltage (VDD2) | 3 to 5.5 | V | Recommended Operating |
| Full-Scale Differential Voltage Input Range | 320 | mV | |
| Data Access Time After MCLK Rising Edge | 40 | ns | CL = 15 pF |
| Data Hold Time After MCLK Rising Edge | 10 | ns | CL = 15 pF |
| Input-Output Momentary Withstand Voltage | 5000 | Vrms | t = 1 min; TA = 25 C |
| Input-Output Resistance | 1012 to 1013 | VI-O = 500 VDC | |
| Input-Output Capacitance | 1.4 | pF | f = 1 MHz |
Applications
- Motor phase and rail current sensing
- Power inverter current and voltage sensing
- Industrial process control
- Data acquisition systems
- General purpose current and voltage sensing
- Traditional current transducer replacements
2410121720_Broadcom-ACPL-7970-500E_C691937.pdf
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