SGM52421R4

The SGM52421R4 is a high-precision, low power, low noise integrated analog front end. It integrates a 24-bit Σ-Δ ADC, supporting 4 differential inputs or 7 single-ended/pseudo- differential inputs, plus an on-chip low-gain amplifier for small-signal acquisition. 

The device features three power modes to balance power draw, output data rate, RMS noise, and alongside multiple configurable filters. At 25SPS single-cycle settling, it provides over 80dB rejection for 50Hz and 60Hz interference at low ODRs. 

The built-in modules include a precision bandgap reference (compatible with the external differential references), programmable excitation and burnout current sources, and a bias voltage generator. A low-side power switch disables bridge sensors between conversions to reduce power consumption. 

The integrated channel sequencer supports up to 16 channels including supply and reference monitoring, enabling interleaved conversion and diagnostics. Each channel can be independently configured for gain, filter, ODR, buffer and reference settings. 

The rich diagnostic functions such as CRC and interface verification improve system reliability, while high integration reduces external components, board size, development time and cost. It achieves over 90% SFF (Safe Failure Fraction) complying with IEC 61508 per FMEDA evaluation. 

Power supply: analog 2.7V to 3.6V (or dual 1.8V rails), digital 1.8V to 3.6V. Packaged Green TQFN-5×5-32IL and TSSOP-24 packages, operating temperature range: -40℃ to +125℃. Multi-function pins are marked with full names or primary functions in this datasheet.