Sigma-Delta Modulator
Sigma-Delta Modulator

Product Details

General Description

The CA-IS1305/CA-IS1306 family of devices is series of precision isolated sigma-delta (Σ-Δ) modulator and optimized for shunt resistor-based current sensing or other small signal measurement applications. 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. 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. These devices also feature up to 150kV/μs common mode transient immunity(CMTI) and enable efficient bit-stream transmission in noisy environments.

The CA-IS1305/CA-IS1306 devices 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
Manchester Encoded or Uncoded Bitstream Output Options
Ultra-Low Input Offset Voltage and DriftCA-IS1305: ±150μV(max) @ 25°C input offset voltage
CA-IS1306: ±100μV(max) @ 25°C input offset voltage
±3.5μV/°C(max) input offset tempco
Low Gain Error and DriftCA-IS1305: ±0.3%(max) @ 25°C gain error
CA-IS1306: ±0.2%(max) @ 25°C gain error
±40ppm/°C(max) gain drift
Excellent AC PerformanceSNR: 85dB (typ)
THD: -93dB (typ) 16-Bit Resolution with No Missing Codes
Robust Isolation BarrierHigh lifetime: >40 years
Up to 5000 VRMS isolation rating
±150 kV/μs typical CMTI
Fault Diagnostic Functions Improve System Safety
Wide Operating Temperature Range–40°C to 125°C
Package8-pin SOIC and 16-pin SOIC

◎ Industrial Motor Controls and Drives
◎ Isolated Power Supplies
◎ Process Signal Isolation

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Simplified Channel Structure

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