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參數資料
| 型號： | AD7719 |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | ADC |
| 英文描述： | Low Voltage, Low Power, Factory-Calibrated 16-/24-Bit Dual ADC |
| 中文描述： | 低電壓，低功耗，工廠校準，16-/24-Bit雙ADC |
| 文件頁數： | 22/40頁 |
| 文件大?。?/td> | 367K |
| 代理商： | AD7719 |
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REV. 0
AD7719
–22–
Operating Characteristics when Addressing the Mode and Control Registers
1
.
Any change to the MD bits will immediately reset both ADCs. A write to the MD2
–
0 bits with no change is also treated as a reset.
(See exception to this in Note 3.)
2. If AD0CON is written when AD0EN = 1, or if AD0EN is changed from 0 to 1, both ADCs are also immediately reset. In other
words, the Main ADC is given priority over the Aux ADC and any change requested on main is immediately responded to.
3. On the other hand, if AD1CON is written to only the Aux ADC is reset. For example, if the Main ADC is continuously convert-
ing when the Aux ADC change or enable occurs, the Main ADC continues undisturbed. Rather than allow the Aux ADC
to operate with a phase difference from the Main ADC, the Aux ADC will fall into step with the outputs of the Main ADC.
The result is that the first conversion time for the Aux channel will be delayed up to three outputs while the Aux ADC update rate
is synchronized to the Main ADC.
4. Once the MODE has been written with a calibration mode, the RDY0/1 bits (STATUS) are immediately reset and the calibration
commences. On completion the appropriate calibration registers are written, the relevant bits in STATUS are written, and
the MD2
–
0 bits are reset to 001 to indicate the ADC is back in Idle Mode.
5. Any calibration request of the Aux ADC while the temperature sensor is selected will fail to complete.
6. Calibrations are performed with the maximum allowable SF value. SF register is reset to user configuration after calibration.
Main ADC Control Register (AD0CON): (A3, A2, A1, A0 = 0, 0, 1, 0; Power-On Reset = 07 Hex)
The Main ADC control Register is an 8-bit register from which data can be read or to which data can be written. This register is used
to configure the Main ADC for range, channel selection, 16-/24-bit operation and unipolar or bipolar coding. Table XIII outlines the bit
designations for the Main ADC control register. AD0CON7 through AD0CON0 indicate the bit location, AD0CON denoting the
bits are in the Main ADC Control Register. AD0CON7 denotes the first bit of the data stream. The number in brackets indicates the
power-on/reset default status of that bit.
Table XIII. Main ADC Control Register (AD0CON) Bit Designations
Bit
Location
Bit
Name
Description
AD0CON7
AD0EN
Main ADC Enable Bit.
Set
by user to enable the Main ADC. When set the Main ADC operates according to the MD
bits in the mode register.
Cleared
by the user to power down the Main ADC.
16-/24-Bit Operating Mode.
Set
by user to enable 16-bit mode. The conversion results from the Main ADC will be rounded
to 16 bits and the Main ADC data register will be 16 bits wide.
Cleared
by user to enable 24-bit mode. The conversion results from the Main ADC will be
rounded to 24 bits and the Main ADC data register will be 24 bits wide.
Main ADC Channel Selection Bits.
Written by the user to select the differential input pairs used by the Main ADC as follows:
Note: The CHCON bit resides in the MODE register.
AD0CON6
WL
AD0CON5
AD0CON4
CH1
CH0
CHCON
0
0
0
0
1
1
1
1
CH1
0
0
1
1
0
0
1
1
CH0
0
1
0
1
0
1
0
1
Positive Input
AIN1
AIN3
AIN2
AIN3
AIN1
AIN3
AIN4
AIN2
Negative Input
AIN2
AIN4
AIN2
AIN2
AIN4
AIN4
AIN4
AIN4
Calibration Register Pair
0
1
0
1
0
1
0
2
AD0CON7
AD0CON6
AD0CON5
AD0CON4
AD0CON3
AD0CON2
AD0CON1
AD0CON0
AD0EN (0)
WL (0)
CH1 (0)
CH0 (0)
U/
B
(0)
RN2 (1)
RN1 (1)
RN0 (1)
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