AD7796 Series

Low Power 16-Bit Sigma-Delta A/D Converter for Bridge Sensors

Catalog

Low Power 16-Bit Sigma-Delta A/D Converter for Bridge Sensors

Part	Package / Case [x]	Package / Case	Package / Case [y]	Configuration	Operating Temperature [Max]	Operating Temperature [Min]	Mounting Type	Voltage - Supply, Digital [Max]	Voltage - Supply, Digital [Min]	Data Interface	Architecture	Sampling Rate (Per Second)	Supplier Device Package	Input Type	Number of Bits	Reference Type	Number of Inputs	Voltage - Supply, Analog [Min]	Voltage - Supply, Analog [Max]	Number of A/D Converters
Analog Devices AD7796BRUZ	0.173 in	16-TSSOP	4.4 mm	MUX-ADC	85 °C	-40 °C	Surface Mount	5.25 V	2.7 V	DSP SPI	Sigma-Delta	123	16-TSSOP	Differential	16	External	1	2.7 V	5.25 V	1

Catalog

Low Power 16-Bit Sigma-Delta A/D Converter for Bridge Sensors

Key Features

• RMS noise: 65 nV

• Instrumentation amp

• Temperature sensor

• Internal clock oscillator

• Simultaneous 50 Hz/60 Hz rejection

• Update rate range: 4.17 Hz to 123 Hz

• Current: 250 µA typ

• Power-down: 1 µA

• Power supply range: 2.7 V to 5.25 V

• –40°C to +85°C temperature range

• Independent interface power supply

• 16-lead TSSOP

Description

The AD7796/AD7797are complete, analog front ends for high precision, bridge sensor applications such as weigh scales. The AD7796/AD7797 contain a Σ-∆ ADC capable of 16-/24-bit resolution, respectively. The on-chip instrumentation amplifier has a fixed gain of 128, allowing small amplitude signals such as those from bridge sensors to be directly interfaced to the ADC.Each device has one differential input and contains a temperature sensor that is internally connected to the ADC. This sensor can be used to perform temperature compensation of the bridge.The devices can be operated with the internal clock or an external clock. The output data rate from the devices is software-programmable and can be varied from 4.17 Hz to 123 Hz.The AD7796/AD7797 operate with a power supply from 2.7 V to 5.25 V. Each device consumes a current of 250 µA typical and is housed in a 16-lead TSSOP.ApplicationsWeigh scalesStrain gagesIndustrial process controlInstrumentationPortable instrumentation