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參數(shù)資料
| 型號： | AD7799 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Low Power, 24-Bit/16-Bit Sigma-Delta ADC with In-Amp |
| 中文描述： | 低功耗，24-Bit/16-BitΣ-Δ型ADC在放大器 |
| 文件頁數(shù)： | 1/17頁 |
| 文件大?。?/td> | 499K |
| 代理商： | AD7799 |
Low Power, 24-Bit/16-Bit
Sigma-Delta ADC with In-Amp
Preliminary Technical Data
AD7798/AD7799
FEATURES
Resolution:
Rev. PrD.
Information furnished by Analog Devices is believed to be accurate and reliable.
However, no responsibility is assumed by Analog Devices for its use, nor for any
infringements of patents or other rights of third parties that may result from its use.
Specifications subject to change without notice. No license is granted by implication
or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective companies.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.326.8703
2004 Analog Devices, Inc. All rights reserved.
www.analog.com
AD7798: 16-Bit
AD7799: 24-Bit
Three Differential Analog Inputs
Low Noise Programmable Gain Amp
RMS noise: 80 nV (Gain = 64) at 16.6 Hz update rate (AD7798)
65 nV (Gain = 64) at 16.6 Hz update rate (AD7799)
30 nV (Gain = 64) at 4 Hz update rate (AD7799)
Update Rate: 4 Hz to 500 Hz
Power
Supply: 2.7 V to 5.25 V operation
Normal: 330 μA typ (AD7798)
400 μA typ (AD7799)
Power-down: 1 μA max
Simultaneous 50 Hz/60 Hz Rejection
Two Programmable Digital Outputs
Internal Clock Oscillator
Reference Detect
100 nA Burnout Currents
Low Side Power Switch
Independent Interface Power Supply
16-Lead TSSOP
INTERFACE
3-wire serial
SPI, QSPI, MICROWIRE, and DSP compatible
Schmitt trigger on SCLK
APPLICATIONS
Pressure measurement
Weigh scales
FUNCTIONAL BLOCK DIAGRAM
AD7799/AD7798
SERIAL
INTERFACE
AND
CONTROL
LOGIC
INTERNAL
CLOCK
SIGMA DELTA
ADC
AIN1(-)
AIN2(+)
AIN2(-)
MUX
IN-AMP
DOUT/RDY
DIN
SCLK
CS
DVDD
AVDD
GND
REFERENCE
DETECT
GND
AIN1(+)
PWRSW
AIN3(-)/P2
AIN3(+)/P1
Figure 1.
GENERAL DESCRIPTION
The AD7798/AD7799 is a low power, complete analog front end
for low frequency measurement applications. The device
contains a low noise 24-bit (AD7799)/ 16-bit (AD7798) ∑-
ADC with three differential 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 80 nV for AD7798 and 65 nV for
the AD7799 at 16.6 Hz.
T
he device contains a low side power switch which is useful in
bridge applications. The switch allows the bridge to be
disconnected from the power supply when conversions are not
being performed and this will minimise power consumption.
The device also has 100 nA burnout currents. These currents
are used to detect if sensors connected to the analog inputs are
burnt out. Other on-chip features include an internal clock so
the user does not have to supply a clock to the device. This
reduces the component count in a system and provides board
space savings. The update rate is programmable on the
AD7798/99. It can be varied from 4 Hz to 500 Hz.
The part operates with a single power supply from 2.7 V to 5.25
V. It consumes a current of 380 uA maximum for the AD7798
and 450 uA maximum for the AD7799. The AD7799/AD7798 is
housed in a 16-lead TSSOP package.
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