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| 型号： | EVAL-AD7785EBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 1/32页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR AD7785 |
| 标准包装： | 1 |
| ADC 的数量： | 1 |
| 位数： | 20 |
| 采样率（每秒）： | 470 |
| 数据接口： | 串行 |
| 输入范围： | ±VREF |
| 工作温度： | -40°C ~ 105°C |
| 已用 IC / 零件： | AD7785 |
| 已供物品： | 板，缆线，CD |
| 相关产品： | AD7785BRUZ-REEL-ND - IC ADC 20BIT 3CH LN LP 16-TSSOP AD7785BRUZ-ND - IC ADC 20BIT SIGMA-DELTA 16TSSOP |
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3-Channel, Low Noise, Low Power, 20-Bit ∑-Δ
ADC with On-Chip In-Amp and Reference
AD7785
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other
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
www.analog.com
Fax: 781.461.3113
2007 Analog Devices, Inc. All rights reserved.
FEATURES
Up to 20 bits effective resolution
RMS noise
40 nV @ 4.17 Hz
85 nV @ 16.7 Hz
Current: 400 μA typical
Power-down: 1 μA maximum
Low noise programmable gain instrumentation amp
Band gap reference with 4 ppm/°C drift typical
Update rate: 4.17 Hz to 470 Hz
3 differential inputs
Internal clock oscillator
Simultaneous 50 Hz/60 Hz rejection
Programmable current sources
On-chip bias voltage generator
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
Thermocouple measurements
RTD measurements
Thermistor measurements
Gas analysis
Industrial process control
Instrumentation
Portable instrumentation
Blood analysis
Smart transmitters
Liquid/gas chromatography
6-digit DVM
GENERAL DESCRIPTION
The AD7785 is a low power, low noise, complete analog front
end for high precision measurement applications. The AD7785
contains a low noise 20-bit ∑-Δ 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 40 nV
when the update rate equals 4.17 Hz.
The device contains a precision low noise, low drift internal
band gap reference and can accept an external differential
reference. Other on-chip features include programmable
excitation current sources, burnout currents, and a bias voltage
generator. The bias voltage generator sets the common-mode
voltage of a channel to AVDD/2.
The AD7785 can be operated with either the internal clock
or an external clock. The output data rate from the device is
software-programmable and can be varied from 4.17 Hz to 470
Hz. The device operates with a power supply from 2.7 V to
5.25 V. It consumes a current of 400 μA typical and is housed in
a 16-lead TSSOP package.
FUNCTIONAL BLOCK DIAGRAM
06
72
1-
0
01
DOUT/RDY
DIN
SCLK
CS
DVDD
SERIAL
INTERFACE
AND
CONTROL
LOGIC
Σ-Δ
ADC
AD7785
AIN1(+)
AIN1(–)
AIN2(+)
AIN2(–)
AVDD
GND
MUX
VBIAS
BAND GAP
REFERENCE
INTERNAL
CLOCK
CLK
GND
AVDD
REFIN(–)/AIN3(–)
IOUT1
IOUT2
AVDD
IN-AMP
BUF
REFIN(+)/AIN3(+)
Figure 1.
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