AD7982BRMZRL7

The AD7982 is an 18-bit, successive approximation, analog-to-digital converter (ADC) that operates from a single power supply, VDD. The AD7982 contains a low power, high speed, 18-bit sampling ADC and a versatile serial interface port. On the CNV rising edge, the AD7982 samples the voltage difference between the IN+ and IN- pins. The voltages on these pins usually swing in opposite phases between 0V and VREF. The reference voltage, VREF, is applied externally and can be set independent of the supply voltage, VDD. Its power scales linearly with throughput. The serial peripheral interface (SPI)-compatible serial interface also features the ability, using the SDI input, to daisy-chain several ADCs on a single 3-wire bus and provides an optional busy indicator. The AD7982 is compatible with 1.8 V, 2.5 V, 3 V, and 5 V logic, using the separate VIO supply. The AD7982 is available in a 10-lead MSOP or a 10-lead LFCSP with operation specified from -40°C to +85°C.

Applications

• Automated test equipment
• Data acquisition systems
• Medical instruments
• Machine automation

Key features

• High performance True differential analog input range: ±VREF 0 V to VREF with VREF between 2.5 V to 5 V
• Easy to drive with the ADA4941-1 or ADA4940-1
• Throughput: 1 MSPS
• Zero latency architecture
• 18-bit resolution with no missing codes
• INL: ±1 LSB typical, ±3 LSB maximum
• Dynamic range: 99 dB, VREF = 5 V
• SNR: 98 dB at fIN = 1 kHz, VREF = 5 V
• THD: −119 dB at fIN = 1 kHz, VREF = 5 V
• SINAD: 97 dB at fIN = 1 kHz, VREF = 5 V
• Low power dissipation
• Single-supply 2.5 V operation with 1.8 V, 2.5 V, 3 V, and 5 V logic interface
• 4 mW at 1 MSPS (VDD only)
• 7 mW at 1 MSPS (total)
• 70 μW at 10 kSPS
• Proprietary serial interface SPI-/QSPI/MICROWIRE-/DSP-compatible
• Ability to daisy-chain multiple ADCs and busy indicator
• 10-lead MSOP and 3 mm × 3 mm 10-lead LFCSP
• Wide operating temperature range: -40°C to +85°C