Sigma-Delta Modulator
Sigma-Delta Modulator

Product Details

General Description

The CA-IS1204 device is precision isolated sigma-delta (Σ-Δ) modulator shunt resistor-based current sensing or other small signal measurement applications. Low offset, low gain error and drift guarantee that measuring accuracy is maintained over the entire operating temperature range. The analog input-side (high-side) and digital output-side (low-side) are separated by unique silicon oxide (SiO2) capacitive isolation barriers that provide up to 5kVRMS galvanic isolation per UL1577 certification. In systems with different voltage domains, this isolation technical is typically used to protect the low voltage side from the high voltage side in case of any faults. This device also features up to 150kV/μs common mode transient immunity and enable efficient bit-stream transmission in noisy environments. It’s fail-safe output is ideal to support high safety system design.

The CA-IS1204 device specified for operation with 5MHz to 21MHz clock input. The internal sigma-delta modulator combined with an external digital decimation sinc3 filter within FPGA or DSP, can achieve up to 85 dB signal-to-noise ratio (SNR) at 78.1 Ksps.

Full-Scale Sense Voltage Range ±250 mV
Ultra-Low Input Offset Voltage and Gain Error±1mV (max) input offset voltage
±2% (max) at 25°C gain error
Excellent AC PerformanceSNR: 85dB (typ)
THD: -91dB (typ)
Robust Isolation BarrierHigh lifetime: >40 years
Up to 5000 VRMS isolation rating
±150 kV/μs typical CMTI
Fault Diagnostic Functions Improve System Safety
External Clock Input
Wide Operating Temperature Range–40°C to 125°C
Package16-pin SOIC

◎ Industrial Motor Controls and Drives
◎ Isolated Power Supplies
◎ Frequency Inverters

Device information
Part NumberPackagePackage Size (NOM)
CA-IS1204 SOIC16-WB(W)10.30 mm × 7.50 mm
Simplified Channel Structure

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