AD7982BCPZ-RL

The AD7982 is an 18-bit, successive approximation ADC that operates from a single supply (VDD). It incorporates a low power, high speed, 18-bit sampling ADC and a versatile serial interface port. On the rising edge of CNV, the AD7982 samples the voltage difference between the IN+ and IN− pins, which typically swing from 0 V to V_REF in opposite phases. The reference voltage (REF) is supplied externally and can be independent of the supply voltage (VDD). Power consumption scales linearly with throughput. The SPI-compatible serial interface also supports daisy-chaining multiple ADCs onto a 3-wire bus using the SDI input, and provides an optional busy indicator. Through a separate supply VIO, the device is compatible with 1.8 V, 2.5 V, 3 V, and 5 V logic. The AD7982 is available in a 10-lead MSOP package or a 10-lead QFN (LFCSP) package, and is rated for an operating temperature range of −40°C to +85°C.

Applications

• Battery-powered devices
• Data acquisition systems
• Medical instruments
• Seismic data acquisition systems

Key features

• 18-bit resolution, no missing codes
• Throughput rate: 1 MSPS
• Low power: 4 mW (1 MSPS, VDD only), 7 mW (1 MSPS, total power), 70 μW at 10 kSPS
• INL: ±1 LSB typical, ±2 LSB maximum
• Dynamic range: 99 dB
• True differential analog input range: ±V_REF, 0 V to V_REF (V_REF from 2.5 V to 5.0 V); either input range selectable; easily driven by ADA4941
• No pipeline delay
• 2.5 V single-supply operation with 1.8 V/2.5 V/3 V/5 V logic interface
• Compatible with patented serial interface: SPI/QSPI/MICROWIRE/DSP
• Daisy-chainable with multiple ADCs and busy indicator
• 10-lead package: MSOP (MSOP-8 footprint) and 3 mm×3 mm QFN (LFCSP) (SOT-23 footprint)