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參數(shù)資料
| 型號： | AB-122 |
| 英文描述： | AB-122 - INTERFACING THE ADS7822 TO THE SYNCHRONOUS SERIAL PORT OF THE 80x51 MICROCONTROLLER |
| 中文描述： | 抗體- 122 - ADS7822的接口的同步串行端口80x51單片機 |
| 文件頁數(shù)： | 6/6頁 |
| 文件大?。?/td> | 106K |
| 代理商： | AB-122 |
6
Also, note that the characteristics of the tone is depen-
dent on the layout of the ADS1210/11. We have taken
an ADS1210/11 out of the demonstration board socket
(DEM-ADS1210/11), plugged it back in, and seen a change
in the oscillation amplitude and frequency. A soldered part,
particularly a surface mount part, should have smaller idle
tones and better performance.
Another way to reduce the idle tone problem is to introduce
a small offset voltage to the signal. As illustrated in Figure
5, a small offset voltage can take the converter away from
the sensitive input voltages that cause the problem.
CONCLUSION
The short cut to 23 bits
rms of effective resolution with the
ADS1210 and ADS1211 gives attention to optimizing the
converter’s programming, circuit layout, a proper clock
source, and special care with the analog input pins. The
converter should be configured in a Turbo Mode of 16 and
data rates from to 10Hz to 60Hz. The analog and digital
power and grounds should be carefully separated for optimal
performance. A crystal oscillator is recommended, although,
clock oscillators can be used with great care. An external
reference is also recommended if 23 bits
rms is the desired
effective resolution. The analog input leads to the input of
the A/D converter must be a short as possible and properly
filtered.
REFERENCES
(1) Ryan, Scranton, “DC Amplifier Noise Revisited”, Analog Devices,
Analog Dialogue, 1984, pg 18-1.
(2) “ADS1210, ADS1211, 24-bit Analog-to-Digital Converter”, Product
Data Sheet PDS-1248, Burr-Brown Corporation.
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