AD7949 Datasheet | Analog Devices

14-Bit, 8-Channel, 250 k SPS Pul SAR 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 k SPS INL/DNL: ±0.5/±0.25 LSB typical SINAD: 85 d B @ 20 k Hz THD: - 100 d B @ 20 k Hz 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 patible with SPI, MICROWIRE, QSPI, and DSP Power dissipation 2.9 m W @ 2.5 V/200 k SPS 10.8 m W @ 5 V/250 k SPS Standby current: 50 n A 20-lead 4 mm × 4 mm LFCSP package .. 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 CNV MUX 14-BIT SAR ADC ONE-POLE LPF SEQUENCER 07351-001 SPI SERIAL INTERFACE SCK SDO DIN Figure 1. Table 1. Multichannel 14-/16-Bit Pul SAR® ADCs Type 14-Bit 16-Bit 16-Bit Channels 8 4 8 250 k SPS AD7949 AD7682 AD7689 500 k SPS 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 operates from a single power supply, VDD. The AD7949 contains all ponents for use in a multichannel, low power data acquisition system, including a true 14-bit SAR ADC with no missing codes; an 8-channel, low crosstalk multiplexer that is useful for configuring the inputs as singleended (with or without ground sense), differential, or bipolar; an internal low drift reference (selectable 2.5 V or 4.096 V) and buffer; a temperature sensor; a selectable one-pole filter; and a sequencer that...