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參數資料
| 型號： | AD7780BRUZ-REEL |
| 廠商： | Analog Devices Inc |
| 文件頁數： | 1/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 24BIT 1CH LP SD 16TSSOP |
| 設計資源： | Weigh Scale Design Using AD7780 with Internal PGA (CN0107) |
| 標準包裝： | 2,500 |
| 位數： | 24 |
| 采樣率（每秒）： | 16.7 |
| 數據接口： | 串行，SPI? |
| 轉換器數目： | 1 |
| 電壓電源： | 模擬和數字 |
| 工作溫度： | -40°C ~ 105°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-TSSOP（0.173"，4.40mm 寬） |
| 供應商設備封裝： | 16-TSSOP |
| 包裝： | 帶卷 (TR) |
| 輸入數目和類型： | 1 個差分，雙極 |
24-Bit, Pin-Programmable,
Ultralow Power Sigma-Delta ADC
AD7780
Rev. A
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
G = 1
OR 128
24-BIT Σ-Δ
ADC
DOUT/RDY
GND AVDD
AIN(+)
AIN(–)
SCLK
DVDD
FILTER
REFIN(+)
GAIN
REFIN(–)
INTERNAL
CLOCK
AD7780
PDRST
BPDSW
07
945
-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
44 nV
65 nV
2.4 μV
2.7 μV
P-P Resolution
17.6
17.1
18.8
18.7
Settling Time
300 ms
120 ms
300 ms
120 ms
GENERAL DESCRIPTION
The AD7780 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, 24-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 AD7780 is particularly suitable for
portable or battery-operated products where very low power is
required. The AD7780 also has a power-down mode that allows
the user to switch off the power to the bridge sensor and power
down the AD7780 when not converting, thus increasing the
battery life of the product.
For ease of use, all the features of the AD7780 are controlled by
dedicated pins. Each time a data read occurs, eight status bits
are appended to the 24-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 greater 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 AD7780 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 a 16-lead
TSSOP package.
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