AD7691 Datasheet | Analog Devices

FEATURES 18-bit resolution with no missing codes Throughput: 250 k SPS INL: ±0.75 LSB typ, ±1.5 LSB max (±6 ppm of FSR) Dynamic range: 102 d B typ @ 250 k SPS Oversampled dynamic range: 125 d B @1 k SPS Noise-free code resolution: 20 bits @ 1 k SPS Effective resolution: 22.7 bits @ 1 k SPS SINAD: 101.5 d B typ @ 1 k Hz THD: - 125 d B typ @ 1 k Hz True differential analog input range: ±VREF 0 V to VREF with VREF up to VDD on both inputs No pipeline delay Single-supply 2.3 V to 5 V operation with 1.8 V/2.5 V/3 V/5 V logic interface Serial interface SPI®/QSPI™/MICROWIRE™/DSP patible Daisy-chain multiple ADCs and busy indicator Power dissipation 5 m W @ 5 V/250 k SPS 50 μW @ 5 V/1 k SPS Standby current: 1 n A 10-lead package: MSOP (MSOP-8 size) and 3 mm × 3 mm QFN 1 (LFCSP) (SOT-23 size) Pin-for-pin patible with the18-bit AD7690 and 16-bit AD7693, AD7688, and AD7687 APPLICATION DIAGRAM +2.3V TO VDD +2.3V TO +5V IN+ ±10V, ±5V, ... REF VDD VIO SDI SCK SDO GND CNV +1.8V TO VDD 3- OR 4-WIRE INTERFACE (SPI, DAISY CHAIN, CS) IN- ADA4941 Figure 2. Table 1. MSOP, QFN (LFCSP)/SOT-23 14-/16-/18-Bit Pul SAR ADC 100 k SPS 250 k SPS AD7691 AD7687 AD7685 AD7694 AD7942 400 k SPS to 500 k SPS AD7690 AD7688 AD7693 AD7686 ADC Driver ADA4941-1 ADA4841-x ADA4941-1 ADA4841-x ADA4841-x Type 18-Bit 16-Bit True Differential 16-Bit Pseudo Differential/ Unipolar 14-Bit AD7684 AD7683 AD7680 AD7940 AD7946 ADA4841-x QFN package in development. Contact sales for samples and availability. APPLICATIONS Battery-powered equipment Data acquisitions Seismic data acquisition systems DVMs Instrumentation Medical instruments 1.5 POSITIVE INL = 0.43LSB NEGATIVE INL = - 0.62LSB GENERAL DESCRIPTION The AD7691 is an 18-bit, charge redistribution, successive approximation, analog-to-digital converter (ADC) that operates from a single power supply, VDD, between 2.3 V and 5 V. It contains a low power, high speed, 18-bit sampling ADC with no missing codes, an internal conversion clock, and a versatile serial...