AD7688

16-Bit, 1.5 LSB INL, 500 kSPS PulSAR™ Differential ADC in MSOP/QFN AD7688 FEATURES 16-bit resolution with no missing codes Throughput: 500 kSPS INL: ±0.4 LSB typ, ±1.5 LSB max (±23 ppm of FSR) Dynamic range: 96.5 dB SNR: 95.5 dB @ 20 kHz THD: −118 dB @ 20 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 Serial interface SPI®/QSPI™/MICROWIRE™/DSP-compatible Daisy-chain multiple ADCs and BUSY indicator Power dissipation 3.75 mW @ 5 V/100 kSPS 3.75 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 AD7685, AD7686, and AD7687 APPLICATION DIAGRAM 0.5V TO 5V 5V VREF 0 IN+ IN– VREF 0 REF VDD VIO SDI 1.8V TO VDD 3- OR 4-WIRE INTERFACE (SPI, DAISY CHAIN, CS) AD7688 GND SCK SDO CNV Figure 2. Table 1. MSOP, QFN (LFCSP)/SOT-23 16-Bit PulSAR ADC Type True Differential Pseudo Differential/Unipolar Unipolar 100 kSPS AD7684 AD7683 AD7680 250 kSPS AD7687 AD7685 AD7694 500 kSPS AD7688 AD7686 GENERAL DESCRIPTION The AD7688 is a 16-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, 16-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 ap...