AD7798 Series

3-Channel, Low Noise, Low Power, 16-Bit, Sigma Delta ADC with On-Chip In-Amp

Catalog

3-Channel, Low Noise, Low Power, 16-Bit, Sigma Delta ADC with On-Chip In-Amp

Part	Package / Case [x]	Package / Case	Package / Case [y]	Architecture	Number of Bits	Sampling Rate (Per Second)	Voltage - Supply, Analog [Min]	Voltage - Supply, Analog [Max]	Mounting Type	Input Type	Number of A/D Converters	Voltage - Supply, Digital [Max]	Voltage - Supply, Digital [Min]	Operating Temperature [Min]	Operating Temperature [Max]	Supplier Device Package	Reference Type	Configuration	Number of Inputs	Data Interface	Input Range	Supplied Contents	Utilized IC / Part	Power (Typ) @ Conditions
Analog Devices AD7798BRUZ	0.173 in	16-TSSOP	4.4 mm	Sigma-Delta	16	470 Per Second	2.7 V	5.25 V	Surface Mount	Differential	1	5.25 V	2.7 V	-40 °C	105 ░C	16-TSSOP	External	MUX-ADC	3	DSP SPI
Analog Devices EVAL-AD7798EBZ					16	470 Per Second					1									Serial	±VREF/gain	Board(s) Cable(s)	AD7798	2.5 mW
Analog Devices AD7798BRUZ-REEL	0.173 in	16-TSSOP	4.4 mm	Sigma-Delta	16	470 Per Second	2.7 V	5.25 V	Surface Mount	Differential	1	5.25 V	2.7 V	-40 °C	105 ░C	16-TSSOP	External	MUX-ADC	3	DSP SPI

Catalog

3-Channel, Low Noise, Low Power, 16-Bit, Sigma Delta ADC with On-Chip In-Amp

Key Features

• RMSnoise:27 nV at 4.17 Hz (AD7799)65 nV at 16.7 Hz (AD7799)40 nV at 4.17 Hz (AD7798)85 nV at 16.7 Hz (AD7798)

• Current: 380 μA typical

• Power-down: 1 μA maximum

• Low noise, programmable gain, instrumentation amp

• Internal clock oscillator

• Simultaneous 50 Hz/60 Hz rejection

• Reference detect

• Low-side power switch

• Programmable digital outputs

• Burnout currents

• Power supply: 2.7 V to 5.25 V

• Update rate: 4.17 Hz to 470 Hz 3 differential inputs

Description

The AD7798 /AD7799are low power, low noise, complete analog front ends for high precision measurement applications. The AD7798 / AD7799 contains a low noise, 16-/24-bit Σ-Δ ADC with three differential analog inputs. The on-chip, low noise instrumentation amplifier means that signals of small amplitude can be interfaced directly to the ADC. With a gain setting of 64, the rms noise is 27 nV for the AD7799 and 40 nV for the AD7798 when the update rate equals 4.17 Hz.On-chip features include a low-side power switch, reference detect, programmable digital output pins, burnout currents, and an internal clock oscillator. The output data rate from the part is software-programmable and can be varied from 4.17 Hz to 470 Hz.The part operates with a power supply from 2.7 V to 5.25 V. The AD7798 consumes a current of 300 μA typical, whereas the AD7799 consumes 380 μA typical. Both devices are housed in a 16-lead TSSOP package.APPLICATIONSWeigh scalesPressure measurementStrain gauge transducersGas analysisIndustrial process controlInstrumentationPortable instrumentationBlood analysisSmart transmittersLiquid/gas chromotography 6-digit DVM