AD7942

Preliminary Technical Data FEATURES 14-bit resolution with no missing codes Throughput: 250 kSPS INL: ±0.4 LSB typ, ±1 LSB max (±0.0061 % of FSR) S/(N + D): 85 dB @ 20 kHz THD: −100 dB @ 20 kHz Pseudo-differential analog input range 0 V to VREF with VREF up to VDD No pipeline delay Single-supply 5V operation with 1.8 V/2.5 V/3 V/5 V logic interface Serial interface SPI®/QSPI™/µWire/DSP compatible Daisy chain multiple ADCs and BUSY indicator Power dissipation 1.15 mW @ 2.5 V/100 kSPS, 3.3 mW @ 5 V/100 kSPS, 1.15 µW @ 2.5 V/100 SPS Stand-by current: 1 nA 10-lead package: MSOP (MSOP-8 size) and 3 mm × 3 mm QFN (LFCSP) (SOT-23 size) Pin-for-pin compatible with the 16-Bit AD7685 14-Bit, 250 kSPS PulSAR™ ADC in MSOP/QFN AD7942 APPLICATION DIAGRAM 0.5 TO 5V 2.5V to 5V 0 TO VREF IN+ IN– REF VDD VIO SDI 1.8 TO VDD 3- OR 4-WIRE INTERFACE (SPI, DAISY CHAIN, CS) AD7942 GND SCK SDO CNV Figure 1. GENERAL DESCRIPTION The AD7942 is a 14-bit, charge redistribution successive approximation, analog-to-digital converter (ADC) that operates from a single 5V 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 www.DataSheet4U.com 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 exte...