AD7949

14-Bit, 8-Channel, 250 kSPS PulSAR ADC AD7949 FEATURES 14-bit resolution with no missing codes 8-channel multiplexer with choice of inputs Unipolar single-ended Differential (GND sense) Pseudobipolar Throughput: 250 kSPS INL/DNL: ±0.5/±0.25 LSB typical SINAD: 85 dB @ 20 kHz THD: −100 dB @ 20 kHz Analog input range: 0 V to VREF with VREF up to VDD Multiple reference types Internal selectable 2.5 V or 4.096 V External buffered (up to 4.096 V) External (up to VDD) Internal temperature sensor (TEMP) Channel sequencer, selectable 1-pole filter, busy indicator No pipeline delay, SAR architecture Single-supply 2.3 V to 5.5 V operation with 1.8 V to 5.5 V logic interface Serial interface compatible with SPI, MICROWIRE, QSPI, and DSP Power dissipation 2.9 mW @ 2.5 V/200 kSPS 10.8 mW @ 5 V/250 kSPS Standby current: 50 nA 20-lead 4 mm × 4 mm LFCSP package www.DataSheet4U.com FUNCTIONAL BLOCK DIAGRAM 0.5V TO VDD – 0.5V 0.1µF REFIN 0.5V TO VDD 10µF REF 2.3V TO 5.5V VDD 1.8V VIO TO VDD BAND GAP REF TEMP SENSOR IN0 IN1 IN2 IN3 IN4 IN5 IN6 IN7 COM AD7949 CNV MUX 14-BIT SAR ADC ONE-POLE LPF SEQUENCER 07351-001 SPI SERIAL INTERFACE SCK SDO DIN GND Figure 1. Table 1. Multichannel 14-/16-Bit PulSAR® ADCs Type 14-Bit 16-Bit 16-Bit Channels 8 4 8 250 kSPS AD7949 AD7682 AD7689 500 kSPS ADC Driver ADA4841-x ADA4841-x ADA4841-x AD7699 GENERAL DESCRIPTION The AD7949 is an 8-channel, 14-bit, charge redistribution successive approximation register (SAR) analog-to-digital converter (ADC) that...