参数资料
型号: EVAL-AD7798EBZ
厂商: Analog Devices Inc
文件页数: 1/28页
文件大小: 0K
描述: BOARD EVAL FOR AD7798
标准包装: 1
ADC 的数量: 1
位数: 16
采样率(每秒): 470
数据接口: 串行
输入范围: ±VREF/增益
在以下条件下的电源(标准): 2.5mW @ 470SPS
工作温度: -40°C ~ 105°C
已用 IC / 零件: AD7798
已供物品: 板,缆线,CD
3-Channel, Low Noise, Low Power,
16-/24-Bit, Σ-Δ ADC with On-Chip In-Amp
Data Sheet
Rev. B
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorother
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
2005–2013 Analog Devices, Inc. All rights reserved.
FEATURES
RMS noise:
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 A typical
Power-down: 1 A maximum
Low noise, programmable gain, instrumentation amp
Update rate: 4.17 Hz to 470 Hz
3 differential inputs
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
–40°C to +105°C temperature range
Independent interface power supply
16-lead TSSOP package
INTERFACE
3-wire serial
SPI, QSPI, MICROWIRE, and DSP compatible
Schmitt trigger on SCLK
APPLICATIONS
Weigh scales
Pressure measurement
Strain gauge transducers
Gas analysis
Industrial process control
Instrumentation
Portable instrumentation
Blood analysis
Smart transmitters
Liquid/gas chromotography
6-digit DVM
FUNCTIONAL BLOCK DIAGRAM
DOUT/RDY
DIN
SCLK
CS
DVDD
SERIAL
INTERFACE
AND
CONTROL
LOGIC
Σ-Δ
ADC
AD7798/AD7799
AD7798: 16-BIT
AD7799: 24-BIT
AIN2(+)
AIN2(–)
AIN3(+)/P1
AIN1(+)
AIN1(–)
AIN3(–)/P2
AVDD
GND
MUX
INTERNAL
CLOCK
GND
AVDD
REFIN(–)
PSW
IN-AMP
REFERENCE
DETECT
REFIN(+)
04856-
001
Figure 1.
GENERAL DESCRIPTION
The AD7798/AD7799 are low power, low noise, complete
analog front ends for high precision measurement applications.
The AD7798/AD7799 contains a low noise, 16-/24-bit ∑-
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 A typical, whereas the
AD7799 consumes 380 A typical. Both devices are housed in a
16-lead TSSOP package.
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