ADI LTC2508IDKD-32#PBF

Is a low-noise, low-power, high-performance 32-bit ADC with an integrated configurable digital filter. Operating from a single 2.5V supply, it features a fully differential input range of up to ±VREF, with VREF ranging from 2.5V to 5.1V. A wide common-mode range of 0V to VREF is supported, simplifying analog signal conditioning requirements. Two output codes are provided: (1) a 32-bit digitally filtered high-precision low-noise code; and (2) a 22-bit no-latency composite code. The configurable digital filter applies low-pass filtering and decimation to the data stream from the SAR ADC core to reduce measurement noise, producing a 32-bit filtered output code. The 22-bit composite code consists of a 14-bit code representing the differential voltage and an 8-bit code representing the common-mode voltage. The 22-bit composite code is available every conversion cycle with no latency cycles. The digital filter can be conveniently configured for 4 different decimation factors via pin strapping. These configurations provide a dynamic range of 131dB (at 3.9ksps) and 145dB (at 61sps). The digital low-pass filter relaxes analog anti-aliasing requirements. Multiple devices can be easily synchronized using the SYNC pin.

• ±0.5ppm INL (typical)
• 145dB dynamic range at 61sps (typical), 131dB dynamic range at 4ksps (typical)
• Guaranteed 32-bit, no missing codes
• Configurable digital filter with synchronization
• Relaxed anti-aliasing filter requirements
• Dual-output 32-bit SAR ADC
• 32-bit digitally filtered low-noise output
• 14-bit differential + 8-bit common-mode 1Msps zero-latency output
• Wide input common-mode range
• Guaranteed operation to 85°C
• 1.8V to 5V SPI-compatible serial I/O
• Low power: 24mW (at 1Msps)
• 24-lead 7mm x 4mm DFN package

• Seismology
• Energy Exploration
• Automated Test Equipment (ATE)
• High-Accuracy Instrumentation