GENERAL DESCRIPTION
●The AD7946 is a 14-bit, charge redistribution, successive approximation, analog-to-digital converter (ADC) that operates from a single 5 V power supply, VDD. It contains a low power, high speed, 14-bit sampling ADC with no missing codes, an internal conversion clock, and a versatile serial interface port. The part also contains a low noise, wide bandwidth, short aperture delay track-and-hold circuit. On the CNV rising edge, it samples an analog input IN+ between 0 V to REF with respect to a ground sense IN−. The reference voltage, REF, is applied externally and can be set up to the supply voltage.
●FEATURES
●14-bit resolution with no missing codes
●Throughput: 500 kSPS
●INL: ±0.4 LSB typical, ±1 LSB maximum (±0.0061% of FSR)
●SINAD: 85 dB @ 20 kHz
●THD: −100 dB @ 20 kHz
●Pseudo differential analog input range
● 0 V to REF with REF up to VDD
●No pipeline delay
●Single-supply 5 V operation with
● 1.8 V/2.5 V/3 V/5 V logic interface
●Serial interface, SPI/QSPI/MICROWIRE™/DSP compatible
●Daisy-chain multiple ADCs and BUSY indicator
●Power dissipation
● 3.3 mW @ 5 V/100 kSPS
● 3.3 μW @ 5 V/100 SPS
●Standby current: 1 nA
●10-lead MSOP (MSOP-8 size) and
● 3 mm × 3 mm QFN (LFCSP) (SOT-23 size)
●Pin-for-pin compatible with the 16-bit AD7686
●APPLICATIONS
●Battery-powered equipment
●Data acquisition
●Instrumentation
●Medical instruments
●Process control
