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參數(shù)資料
| 型號： | ADC12048EVAL |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 12-Bit Plus Sign 216 kHz 8-Channel Sampling Analog-to-Digital Converter |
| 中文描述： | 12位帶符號216 kHz的8聲道采樣模擬到數(shù)字轉(zhuǎn)換器 |
| 文件頁數(shù)： | 9/30頁 |
| 文件大?。?/td> | 635K |
| 代理商： | ADC12048EVAL |
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Notes on Specifications
(Continued)
Note 13:
Zero error is a measure of the deviation from the mid-scale voltage (a code of zero), expressed in LSB. It is the average value of the code transitions be-
tween 1 to 0 and 0 to +1 (see Figure 8).
Note 14:
The DC common-mode error is measured with both inputs shorted together and driven from 0V to 5V. The measured value is referred to the resulting out-
put value when the inputs are driven with a 2.5V input.
Note 15:
Power Supply Sensitivity is measured after an Auto-Zero and Auto Calibration cycle has been completed with V
A
+ and V
D
+ at the specified extremes.
Note 16:
V
REFCM
(Reference Voltage Common Mode Range) is defined as
Note 17:
The ADC12048’s self-calibration technique ensures linearity and offset errors as specified, but noise inherent in the self-calibration process will result in
a repeatability uncertainly of
±
0.20 LSB.
Note 18:
Total Unadjusted Error (TUE) includes offset, full scale linearity and MUX errors.
Note 19:
The ADC12048 parts used to gather the information for these curves were auto-calibrated prior to taking the measurements at each test condition. The
auto-calibration cycle cancels any first order drifts due to test conditions. However, each measurement has a repeatability uncertainty error of 0.2 LSB. See (Note
17).
Note 20:
The reference input current is a DC average current drawn by the reference input with a full-scale sinewave input. The ADC12048 is continuously con-
verting with a throughput rate of 206 kHz.
Note 21:
These typical curves were measured during continuous conversions with a positive half-scale DC input. A 240 ns RD pulse was applied 25 ns after the
RDY signal went low. The data bus lines were loaded with 2 HC family CMOS inputs (C
L
～
20 pF).
Note 22:
Any other values placed in the command field are meaningless. However, if a code of 101 or 110 is placed in the command field and the CS, RD and WR
go low at the same time, the ADC12048 will enter a test mode. These test modes are only to be used by the manufacturer of this device. A hardware power-off and
power-on reset must be done to get out of these test modes.
Electrical Characteristics
DS012387-5
FIGURE 1. Output Digital Code vs the Operating Input Voltage Range (General Case)
A
www.national.com
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