Analog Devices Inc. ADFS7124 Low-Power Low-Noise Analog Front End

Analog Devices Inc. ADFS7124 Low-Power Low-Noise Analog Front End is designed for high-precision measurements. The Analog Devices ADFS7124 features a 24-bit Σ-Δ analog-to-digital converter (ADC) with low noise and can be configured with four differential inputs or seven single-ended/pseudo-differential inputs. The device’s on-chip low gain stage enables direct interfacing of small amplitude signals with the ADC. The device offers three integrated power modes, allowing customization of current consumption, output data rates, and RMS noise. Additionally, it provides various filter options for maximum flexibility.

Features

Functional safety approved to SC3 by TÜV Rheinland, File Number 968/FSP 2188.01/23
Three power modes
RMS noise
- 24nV_RMS at 1.17 SPS, gain = 128 (255µA typical) low power
- 20nV_RMS at 2.34 SPS, gain = 128 (355µA typical) mid-power
- 23nV_RMS at 9.4 SPS, gain = 128 (930µA typical) full power
Up to 22 noise-free bits in all power modes (gain = 1)
Output data rate
- 9.38SPS to 19,200SPS full power
- 2.34SPS to 4800SPS mid-power
- 1.17SPS to 2400SPS low power
Rail-to-rail analog inputs for gains > 1
Simultaneous 50Hz/60Hz rejection at 25SPS (single cycle settling)
Diagnostic functions (which aid safe integrity level (SIL) certification)
Crosspoint multiplexed analog inputs
4 differential/7 pseudo-differential inputs

Programmable gain (1 to 128)
Band gap reference with 15ppm/°C drift maximum (70µA)
Matched programmable excitation currents
Internal clock oscillator
On-chip bias voltage generator
Low-side power switch
General-purpose outputs
Multiple filter options
Internal temperature sensor
Self and system calibration
Sensor burnout detection
Automatic channel sequencer
Per channel configuration
2.7V to 3.6V and ±1.8V power supply
Independent interface power supply
5µA maximum power-down current
−40°C to +125°C temperature range
32-lead LFCSP
3-wire or 4-wire serial interface
- SPI, QSPI, MICROWIRE, and DSP compatible
- Schmitt trigger on SCLK
4kV ESD

Applications

Temperature measurement
Pressure measurement
Industrial process control

Instrumentation
Smart transmitters

Analog Devices Inc. ADFS7124 Low-Power Low-Noise Analog Front End

Features

Applications

FUNCTIONAL BLOCK DIAGRAM

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