AD7781BRZ

Semiconductors - ICs

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> Analog-to-Digital Converters - ADC

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Series Information for AD7781BRZ - Analog Devices

Features

  • feature
    Pin-programmable filter response Update rate: 10 Hz or 16.7 Hz Pin-programmable in-amp gain Pin-programmable power-down and reset Status function Internal clock oscillator Internal bridge power-down switch Current 115 u03bcA typical (gain = 1) 330 u03bcA typical (gain = 128) Simultaneous 50 Hz/60 Hz rejection Power supply: 2.7 V to 5.25 V u221240u00b0C to +105u00b0C temperature range Independent interface power supply Packages 14-lead, narrow body SOIC 16-lead TSSOP 2-wire serial interface (read-only device) SPI compatible Schmitt trigger on SCLK

Description

IC ADC 20BIT 1CH LP SD 14SO

The AD7781 is a complete, low power front-end solution for bridge sensor products, including weigh scales, strain gages, and pressure sensors. It contains a precision, low power, 20-bit sigma-delta (Σ-Δ) ADC, an on-chip, low noise programmable gain amplifier (PGA), and an on-chip oscillator. Consuming only 330 μA, the AD7781 is particularly suitable for portable or battery-operated products where very low power is required. The AD7781 also has a power-down mode that allows the user to switch off the power to the bridge sensor and power down the AD7781 when not converting, thus increasing the battery life of the product. For ease of use, all the features of the AD7781 are controlled by dedicated pins. Each time that a data read occurs, eight status bits are appended to the 20-bit conversion. These status bits contain a pattern sequence that can be used to confirm the validity of the serial transfer. The on-chip PGA has a gain of 1 or 128, supporting a full-scale differential input of ±5 V or ±39 mV. The device has two filter response options. The filter response at the 16.7 Hz update rate provides superior dynamic performance. The settling time is 120 ms at this update rate. At the 10 Hz update rate, the filter response provides better than −45 dB of stop-band attenuation. In load cell applications, this stop-band rejection is useful to reject low frequency mechanical vibrations of the load cell. The settling time is 300 ms at this update rate. Simultaneous 50 Hz/ 60 Hz rejection occurs at both the 10 Hz and 16.7 Hz update rates. The AD7781 operates with a power supply from 2.7 V to 5.25 V. It is available in a narrow body, 14-lead SOIC package and in a 16-lead TSSOP package.

Specifications

Resolution (Bits):
20bit
Sampling Rate:
16.7SPS
Input Channel Type:
Single Ended
Data Interface:
2 Wire Serial
Supply Voltage Type:
Single
Supply Voltage Min:
2.7V
Supply Voltage Max:
5.25V
ADC / DAC Case Style:
SOIC
No. of Pins:
14Pins
Operating Temperature Min:
-40°C
Operating Temperature Max:
105°C
Product Range:
Single 20-Bit Sigma-Delta ADCs
Automotive Qualification Standard:
-
RoHS Phthalates Compliant:
Yes
MSL:
MSL 1 - Unlimited
SVHC:
No SVHC (07-Jul-2017)
Base Number:
7781
IC Case Style:
SOIC
No. of Channels:
1Channels
Operating Temperature Range:
-40°C to +105°C
Supply Current:
420µA
Supply Voltage Range:
2.7V to 5.25V
Supply Voltage Range - Analogue:
2.7V to 5.25V
Supply Voltage Range - Digital:
2.7V to 5.25V

Alternate Descriptions

Richardson RFPD
CONVERTER - ADC