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| 型号： | AD7780BRUZ-REEL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 3/16页 |
| 文件大小： | 0K |
| 描述： | IC ADC 24BIT 1CH LP SD 16TSSOP |
| 设计资源： | Weigh Scale Design Using AD7780 with Internal PGA (CN0107) |
| 标准包装： | 2,500 |
| 位数： | 24 |
| 采样率（每秒）： | 16.7 |
| 数据接口： | 串行，SPI? |
| 转换器数目： | 1 |
| 电压电源： | 模拟和数字 |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 16-TSSOP |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 1 个差分，双极 |
AD7780
Rev. A | Page 11 of 16
THEORY OF OPERATION
01
100
80
60
40
20
F
IL
T
E
R
GA
IN
(
d
B
)
INPUT SIGNAL FREQUENCY (Hz)
–1000
0
–20
–40
–60
–80
–100
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07
94
5-
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20
The AD7780 is a low power ADC that incorporates a precision
24-bit, Σ-Δ modulator; a PGA; and an on-chip digital filter
intended for measuring wide dynamic range, low frequency
signals. The part provides a complete front-end solution for
bridge sensor applications such as weigh scales and pressure
sensors.
The device has an internal clock and one buffered differential
input. It offers a choice of two update rates (10 Hz or 16.7 Hz)
and two gain settings (1 or 128). These functions are controlled
using dedicated pins, which makes the interface easy to configure.
A 2-wire interface simplifies data retrieval from the AD7780.
FILTER, DATA RATE, AND SETTLING TIME
The AD7780 has two filter options. When the FILTER pin is low,
the 16.7 Hz filter is selected; when the FILTER pin is high, the
10 Hz filter is selected. When the polarity of FILTER is changed,
the AD7780 modulator and filter are reset immediately. DOUT/
RDY is set high, and the ADC then begins conversions using
the selected filter response. The first conversion requires the
complete settling time of the filter. Subsequent conversions occur
at the selected update rate. The settling time of the 10 Hz filter is
300 ms (three conversion cycles), and the settling time of the
16.7 Hz filter is 120 ms (two conversion cycles).
Figure 20. Filter Profile with Update Rate = 16.7 Hz (FILTER = 0)
01
100
80
60
40
20
F
IL
T
E
R
GA
IN
(
d
B
)
INPUT SIGNAL FREQUENCY (Hz)
–1000
0
–20
–40
–60
–80
–100
20
07
94
5-
0
21
When a step change occurs on the analog input, the AD7780
requires several conversion cycles to generate a valid conversion.
If the step change occurs synchronous to the conversion period, the
settling time of the AD7780 must be allowed to generate a valid
conversion. If the step change occurs asynchronous to the end
of a conversion, an extra conversion must be allowed to generate
a valid conversion. The data register is updated with all the con-
versions, but, for an accurate result, the user must allow for the
required time.
Figure 21. Filter Profile with Update Rate = 10 Hz (FILTER = 1)
The 10 Hz filter provides greater than 45 dB of rejection in the
stop band. The only external filtering required on the analog inputs
is a simple R-C filter to provide rejection at multiples of the master
clock. A 1 kΩ resistor in series with each analog input, a 0.01 μF
capacitor from each input to GND, and a 0.1 μF capacitor from
AIN(+) to AIN() are recommended.
When the filter is changed, DOUT/RDY goes high and remains
high until the appropriate settling time for that filter elapses
(see
). Therefore, the user should complete any read
operations before changing the filter. Otherwise, 1s are read
back from the AD7780 because the DOUT/
RDY pin is set high
following the filter change.
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