Programmable Resistor IC Circuit Board AD7193BRUZ 4 Channel 4.8 kHz

AD7193BRUZ 4-Channel 4.8 kHz, Ultralow Noise, 24-Bit Sigma-Delta ADC with PGA

FEATURES

Fast settling filter option 4 differential/8 pseudo differential input channels RMS noise: 11 nV @ 4.7 Hz (gain = 128) 15.5 noise-free bits @ 2.4 kHz (gain = 128) Up to 22 noise-free bits (gain = 1) Offset drift: ±5 nV/°C Gain drift: ±1 ppm/°C Specified drift over time Automatic channel sequencer Programmable gain (1 to 128) Output data rate: 4.7 Hz to 4.8 kHz Internal or external clock Simultaneous 50 Hz/60 Hz rejection 4 general-purpose digital outputs Power supply AVDD: 3 V to 5.25 V DVDD: 2.7 V to 5.25 V Current: 4.65 mA Temperature range: −40°C to +105°C Package: 28-lead TSSOP Interface 3-wire serial SPI, QSPI™, MICROWIRE™, and DSP compatible Schmitt trigger on SCLK APPLICATIONS PLC/DCS analog input modules Data acquisition Strain gage transducers Pressure measurement Temperature measurement Flow measurement Weigh scales Chromatography Medical and scientific instrumentation GENERAL DESCRIPTION The AD7193 is a low noise, complete analog front end for high precision measurement applications. It contains a low noise, 24-bit sigma-delta (Σ-Δ) analog-to-digital converter (ADC). The on-chip low noise gain stage means that signals of small amplitude can interface directly to the ADC. The device can be configured to have four differential inputs or eight pseudo differential inputs. The on-chip channel sequencer allows several channels to be enabled simultaneously, and the AD7193 sequentially converts on each enabled channel. This simplifies communication with the part. The on-chip 4.92 MHz clock can be used as the clock source to the ADC or, alternatively, an external clock or crystal can be used. The output data rate from the part can be varied from 4.7 Hz to 4.8 kHz. The device has a very flexible digital filter, including a fast settling option. Variables such as output data rate and settling time are dependent on the option selected. For applications that require all conversions to be settled, the AD7193 includes zero latency. The part operates with a power supply from 3 V to 5.25 V. It consumes a current of 4.65 mA and it is housed in a 28-lead TSSOP package.

ABSOLUTE MAXIMUM RATINGS TA = 25°C, unless otherwise noted.

THERMAL RESISTANCE

θJA is specified for the worst-case conditions, that is, a device soldered in a circuit board for surface-mount packages. Thermal Resistance

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