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參數資料
| 型號： | AD7853ARS |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | 3 V to 5 V Single Supply, 200 kSPS 12-Bit Sampling ADCs |
| 中文描述： | 1-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO24 |
| 封裝： | SSOP-24 |
| 文件頁數： | 13/34頁 |
| 文件大小： | 350K |
| 代理商： | AD7853ARS |
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REV. B
–13–
AD7853/AD7853L
WRITE TO CONTROL REGISTER SETTING STCAL = 0, RDSLT1 = 1,
RDSLT0 = 0, AND CALSLT1, CALSLT0 = 00, 01, 10, 11
CAL REGISTER POINTER IS
AUTOMATICALLY RESET
FINISHED
NO
YES
START
READ CAL REGISTER
CAL REGISTER POINTER IS
AUTOMATICALLY INCREMENTED
LAST
REGISTER
READ
OPERATION
OR
ABORT
Figure 9. Flowchart for Reading from the Calibration
Registers
Adjusting the Offset Calibration Register
The offset calibration register contains 16 bits, two leading zeros
and 14 data bits. By changing the contents of the offset register,
different amounts of offset on the analog input signal can be
compensated for. Increasing the number in the offset calibra-
tion register compensates for negative offset on the analog input
signal, and decreasing the number in the offset calibration regis-
ter compensates for positive offset on the analog input signal.
The default value of the offset calibration register is 0010 0000
0000 0000 approximately. This is not an exact value, but the
value in the offset register should be close to this value. Each of
the 14 data bits in the offset register is binary weighted; the
MSB has a weighting of 5% of the reference voltage, the MSB-1
has a weighting of 2.5%, the MSB-2 has a weighting of 1.25%,
and so on down to the LSB, which has a weighting of 0.0006%.
This gives a resolution of
±
0.0006% of V
REF
approximately.
More accurately the resolution is
±
(0.05
×
V
REF
)/2
13
volts =
±
0.015 mV, with a 2.5 V reference. The maximum offset that
can be compensated for is
±
5% of the reference voltage, which
equates to
±
125 mV with a 2.5 V reference and
±
250 mV with a
5 V reference.
Q. If a +20 mV offset is present in the analog input signal and the
reference voltage is 2.5 V, what code needs to be written to the
offset register to compensate for the offset
A. 2.5 V reference implies that the resolution in the offset
register is 5%
×
2.5 V/2
13
= 0.015 mV. +20 mV/0.015 mV
= 1310.72; rounding to the nearest number gives 1311. In
binary terms this is 0101 0001 1111, therefore decrease the
offset register by 0101 0001 1111.
This method of compensating for offset in the analog input
signal allows for fine tuning the offset compensation. If the
offset on the analog input signal is known, there will be no need
to apply the offset voltage to the analog input pins and do a
system calibration. The offset compensation can take place in
software.
Adjusting the Gain Calibration Register
The gain calibration register contains 16 bits, two leading 0s
and 14 data bits. The data bits are binary weighted as in the
offset calibration register. The gain register value is effectively
multiplied by the analog input to scale the conversion result
over the full range. Increasing the gain register compensates for
a smaller analog input range and decreasing the gain register
compensates for a larger input range. The maximum analog
input range that the gain register can compensate for is 1.025
times the reference voltage, and the minimum input range is
0.975 times
the reference voltage.
相關PDF資料 |
PDF描述 |
|---|---|
| AD7853BN | 3 V to 5 V Single Supply, 200 kSPS 12-Bit Sampling ADCs |
| AD7853BR | 3 V to 5 V Single Supply, 200 kSPS 12-Bit Sampling ADCs |
| AD7853LAN | 3 V to 5 V Single Supply, 200 kSPS 12-Bit Sampling ADCs |
| AD7853LAR | 3 V to 5 V Single Supply, 200 kSPS 12-Bit Sampling ADCs |
| AD7853LBN | 3 V to 5 V Single Supply, 200 kSPS 12-Bit Sampling ADCs |
相關代理商/技術參數 |
參數描述 |
|---|---|
| AD7853ARS-REEL | 制造商:Analog Devices 功能描述:ADC Single SAR 200ksps 12-bit Serial 24-Pin SSOP T/R 制造商:Rochester Electronics LLC 功能描述:SELF CAL.SERIAL 12-BIT ADC I.C. - Tape and Reel |
| AD7853ARS-REEL7 | 制造商:Analog Devices 功能描述:ADC Single SAR 200ksps 12-bit Serial 24-Pin SSOP T/R 制造商:Analog Devices 功能描述:ADC SGL SAR 200KSPS 12-BIT SERL 24SSOP - Tape and Reel |
| AD7853ARSZ | 功能描述:IC ADC 12BIT SRL 200KSPS 24SSOP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 位數:12 采樣率（每秒）:3M 數據接口:- 轉換器數目:- 功率耗散（最大）:- 電壓電源:- 工作溫度:- 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應商設備封裝:SOT-23-6 包裝:帶卷 (TR) 輸入數目和類型:- |
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| AD7853ARZ | 功能描述:IC ADC 12BIT SRL 200KSPS 24SOIC RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1,000 系列:- 位數:12 采樣率（每秒）:300k 數據接口:并聯 轉換器數目:1 功率耗散（最大）:75mW 電壓電源:單電源 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:24-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:24-SOIC 包裝:帶卷 (TR) 輸入數目和類型:1 個單端，單極；1 個單端，雙極 |
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