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參數資料
| 型號： | AD7781CRZ |
| 廠商： | Analog Devices Inc |
| 文件頁數： | 1/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 20BIT 1CH LP SD 14SOIC |
| 產品培訓模塊： | Weigh Scale Introduction |
| 設計資源： | Weigh Scale Design Using AD7781 with Internal PGA (CN0108) |
| 標準包裝： | 56 |
| 位數： | 20 |
| 采樣率（每秒）： | 16.7 |
| 數據接口： | 串行，SPI? |
| 轉換器數目： | 1 |
| 電壓電源： | 單電源 |
| 工作溫度： | -40°C ~ 105°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 14-SOIC（0.154"，3.90mm 寬） |
| 供應商設備封裝： | 14-SO |
| 包裝： | 管件 |
| 輸入數目和類型： | 1 個差分，雙極 |
| 產品目錄頁面： | 779 (CN2011-ZH PDF) |
20-Bit, Pin-Programmable,
Low Power Sigma-Delta ADC
AD7781
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother
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
2009 Analog Devices, Inc. All rights reserved.
FEATURES
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 μA typical (gain = 1)
330 μA typical (gain = 128)
Simultaneous 50 Hz/60 Hz rejection
Power supply: 2.7 V to 5.25 V
40°C to +105°C 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
APPLICATIONS
Weigh scales
Pressure measurement
Industrial process control
Portable instrumentation
FUNCTIONAL BLOCK DIAGRAM
A
G = 1
OR 128
20-BIT Σ-Δ
ADC
DOUT/RDY
GND
VDD
AIN(+)
AIN(–)
SCLK
DVDD
FILTER
REFIN(+)
GAIN
REFIN(–)
INTERNAL
CLOCK
AD7781
PDRST
BPDSW
08
16
2-
00
1
Figure 1.
Table 1.
Parameter
Gain = 128
Gain = 1
Output Data Rate
10 Hz
16.7 Hz
10 Hz
16.7 Hz
RMS Noise
C Grade
44 nV
65 nV
2.4 μV
2.7 μV
B Grade
55 nV
90 nV
2.4 μV
2.7 μV
P-P Resolution
C Grade
17.6
17.1
18.8
18.7
B Grade
17.3
16.6
18.8
18.7
Settling Time
300 ms
120 ms
300 ms
120 ms
GENERAL DESCRIPTION
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.
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| AD7781CRZ-REEL | 功能描述:IC ADC 20BIT 1CH LP SD 14SOIC RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:2,500 系列:- 位數:16 采樣率（每秒）:15 數據接口:MICROWIRE?，串行，SPI? 轉換器數目:1 功率耗散（最大）:480µW 電壓電源:單電源 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:38-WFQFN 裸露焊盤 供應商設備封裝:38-QFN（5x7） 包裝:帶卷 (TR) 輸入數目和類型:16 個單端，雙極；8 個差分，雙極 配用:DC1011A-C-ND - BOARD DELTA SIGMA ADC LTC2494 |
| AD7782 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Read Only, Pin Configured 24-Bit ADC |
| AD7782BRU | 制造商:Analog Devices 功能描述:ADC Single Delta-Sigma 20sps 24-bit Serial 16-Pin TSSOP 制造商:Analog Devices 功能描述:IC 24-BIT ADC |
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| AD7782BRU-REEL7 | 制造商:Analog Devices 功能描述:ADC Single Delta-Sigma 20sps 24-bit Serial 16-Pin TSSOP T/R |
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