Product Details
●The AD7690 is an 18-bit, successive approximation, analog-to-digital converter (ADC) that operates from a single power supply, VDD. It contains a low power, high speed, 18-bit sampling ADC with no missing codes, an internal conversion clock, and a versatile serial interface port. On the CNV rising edge, it samples the voltage difference between the IN+ and IN− pins. The voltages on these pins swing in opposite phase between 0 V and REF. The reference voltage, REF, is applied externally and can be set up to the supply voltage.
●The power of the AD7690 scales linearly with the throughput.
●The 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. It is compatible with 1.8 V, 2.5 V, 3 V, or 5 V logic, using the separate VIO supply.
●The AD7690 is housed in a 10-lead MSOP or a 10-lead QFN (LFCSP) with operation specified from −40°C to +85°C.
●Applications
● Battery-powered equipment
● Data acquisition
● Seismic data acquisition systems
● DVMs
● Instrumentation
● Medical instruments
●### Features and Benefits
● 18-bit resolution with no missing codes
● Throughput: 400 kSPS
● INL: ±0.75 LSB typ, ±1.5 LSB max (±6 ppm of FSR)
● Dynamic range: 102 dB @ 400 kSPS
● Oversampled dynamic range: 125 dB @ 1 kSPS
● Noise-free code resolution: 20 bits @ 1 kSPS
● Effective resolution: 22.7 bits @ 1 kSPS
● SINAD: 101.5 dB @ 1 kHz
● THD: −125 dB @ 1 kHz
● True differential analog input range: ±VREF 0 V to VREF with VREF up to VDD on both inputs
● No pipeline delay
● Single-supply 5 V operation with 1.8 V/2.5 V/3 V/5 V logic interface
