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| 型號： | ADS1255IDBR |
| 英文描述： | Very Low Noise, 24-Bit Analog-to-Digital Converter |
| 中文描述： | 極低噪聲，24位模擬數(shù)字轉(zhuǎn)換器 |
| 文件頁數(shù)： | 24/39頁 |
| 文件大小： | 427K |
| 代理商： | ADS1255IDBR |
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SBAS288D JUNE 2003 REVISED AUGUST 2004
www.ti.com
24
CALIBRATION
Offset and gain errors can be minimized using the
ADS1255/6 onboard calibration circuitry. Figure 23 shows
the calibration block diagram. Offset errors are corrected
with the Offset Calibration (OFC) register and, likewise,
full-scale errors are corrected with the Full-Scale
Calibration (FSC) register. Each of these registers is
24-bits and can be read from or written to.
Analog
Modulator
PGA
Digital
Filter
Output
X
OFC
Register
Σ
VREFN
VREFP
AIN
P
AIN
N
FSC
Register
Figure 23. Calibration Block Diagram
The output of the ADS1255/6 after calibration is shown in
Equation 3.
Output
PGA
·
V
IN
2V
REF
OFCFSC
·
where
α
and
β
vary with data rate settings shown in
Table 18 along with the ideal values (assumes perfect
analog performance) for OFC and FSC. OFC is a Binary
Two’s Complement number that can range from
8,388,608 to 8,388,607, while FSC is unipolar ranging
from 0 to 16,777,215.
The ADS1255/6 supports both self-calibration and system
calibration for any PGA setting using a set of five
commands:
SELFOCAL,
SYSOCAL, and SYSGCAL. Calibration can be done at
any time, though in many applications the ADS1255/6 drift
performance is low enough that a single calibration is all
that is needed. DRDY goes high when calibration begins
and remains so until settled data is ready afterwards.
There is no need to discard data after a calibration. It is
strongly recommended to issue a self-calibration
command after power-up when the reference has
stabilized. After a reset, the ADS1255/6 performs
self-calibration. Calibration must be performed whenever
the data rate changes and should be performed when the
buffer configuration or PGA changes.
SELFGCAL,
SELFCAL,
Table 18. Calibration Values for Different Data Rate Settings
DATA RATE
(SPS)
α
β
IDEAL OFC
IDEAL FSC
30,000
15,000
7500
3750
2000
1000
500
100
60
50
30
25
15
10
5
2.5
400000H
400000H
400000H
400000H
3C0000H
3C0000H
3C0000H
4B0000H
3E8000H
4B0000H
3E8000H
4B0000H
3E8000H
5DC000H
5DC000H
5DC000H
1.8639
1.8639
1.8639
1.8639
1.7474
1.7474
1.7474
2.1843
1.8202
2.1843
1.8202
2.1843
1.8202
2.7304
2.7304
2.7304
000000H
000000H
000000H
000000H
000000H
000000H
000000H
000000H
000000H
000000H
000000H
000000H
000000H
000000H
000000H
000000H
44AC08H
44AC08H
44AC08H
44AC08H
494008H
494008H
494008H
3A99A0H
4651F3H
3A99A0H
4651F3H
3A99A0H
4651F3H
2EE14CH
2EE14CH
2EE14CH
(3)
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