AD7788 데이터 시트보기 (PDF) - Analog Devices
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AD7788 Datasheet PDF : 20 Pages
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FEATURES
AD7788: 16-bit resolution
AD7789: 24-bit resolution
Power
Supply: 2.5 V to 5.25 V operation
Normal: 75 µA maximum
Power-down: 1 µA maximum
RMS noise: 1.5 µV
AD7788: 16-bit p-p resolution
AD7789: 19-bit p-p resolution (21.5 bits effective)
Integral nonlinearity: 3.5 ppm typical
Simultaneous 50 Hz and 60 Hz rejection
Internal clock oscillator
VDD monitor channel
10-lead MSOP
INTERFACE
3-wire serial
SPI®, QSPI™, MICROWIRE™, and DSP compatible
Schmitt trigger on SCLK
APPLICATIONS
Smart transmitters
Battery applications
Portable instrumentation
Sensor measurement
Temperature measurement
Pressure measurement
Weigh scales
4 to 20 mA loops
Low Power, 16-/24-Bit
Sigma-Delta ADC
AD7788/AD7789
FUNCTIONAL BLOCK DIAGRAM
REFIN(+) REFIN(–) GND VDD
AD7788/
AD7789
CLOCK
AIN(+)
AIN(–)
Σ-∆
ADC*
SERIAL
INTERFACE
AND
CONTROL
LOGIC
DOUT/RDY
DIN
SCLK
CS
*AD7788: 16-BIT ADC
AD7789: 24-BIT ADC
Figure 1.
03539-0-001
GENERAL DESCRIPTION
The AD7788/AD7789 are low power, low noise, analog front
ends for low frequency measurement applications. The AD7789
contains a low noise 24-bit ∑-∆ ADC with one differential input.
The AD7788 is a 16-bit version of the AD7789.
The device operates from an internal clock. Therefore, the user
does not have to supply a clock source to the device. The output
data rate is 16.6 Hz, which gives simultaneous 50 Hz/60 Hz
rejection.
The part operates with a single power supply from 2.5 V to
5.25 V. When operating from a 3 V supply, the power dissipation
for the part is 225 µW maximum. The AD7788/AD7789 is
housed in a 10-lead MSOP.
Rev. 0
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Fax: 781.326.8703 © 2003 Analog Devices, Inc. All rights reserved.
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