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參數(shù)資料
| 型號： | AD7799 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Low Power, 24-Bit/16-Bit Sigma-Delta ADC with In-Amp |
| 中文描述： | 低功耗，24-Bit/16-BitΣ-Δ型ADC在放大器 |
| 文件頁數(shù)： | 17/17頁 |
| 文件大?。?/td> | 499K |
| 代理商： | AD7799 |
Preliminary Technical Information
AD7798/AD7799
OFFSET REGISTER (RS2, RS1, RS0 = 1, 1, 0; Power-on/Reset = 0x8000 (AD7798)/0x800000 (AD7799))
The offset register holds the offset calibration coefficient for the ADC. The power-on-reset value of the internal zero-scale calibration
coefficient register is 8000 hex (AD7798)/800000 hex (AD7799). The AD7798/AD7799 has 3 offset registers. Each of these registers is a
16/24-bit read/write register.
However, when writing to the offset-scale registers, the ADC must be placed in power down mode or idle
mode. This register is used in conjunction with its associated full-scale register to form a register pair. The power-on-reset value is
automatically overwritten if an internal or system zero-scale calibration is initiated by the user.
FULLSCALE Register (RS2, RS1, RS0 = 1, 1, 1; Power-on/Reset = 0x5XXX (AD7798)/0x5XXX000 (AD7799))
The full-scale register holds the full-scale calibration coefficient for the ADC. The AD7798/AD7799 has 3 full-scale registers. Each of
these registers is a 16/24-bit read/write register.
However, when writing to the full-scale registers, the ADC must be placed in power
down mode or idle mode. The full-scale error of the AD7799/AD7798 is calibrated in the factory at both a gain of 1 and 128. Therefore if
the gain is set to 128, as on power-on, or if the gain is set to 1, the factory calibrated internal full-scale coefficients are automatically
loaded into the full-scale registers of the AD7799/AD7798. Therefore, every device will have different default coefficients. The user can
overwrite these values, if required. These coefficients will be automatically overwritten if an internal or system full-scale calibration is
initiated by the user. A full-scale calibration should be performed when the gain is changed. When the gain equals 128, internal full-scale
calibrations cannot be performed.
TYPICAL APPLICATION
REV. PrD. Page 17 of 17
AVDD
IN+
IN-
OUT+
OUT-
REFIN(-)
GND
AVDD
AD7799/AD7798
SERIAL
INTERFACE
AND
CONTROL
LOGIC
SIGMA DELTA
ADC
REFERENCE
DETECT
INTERNAL
CLOCK
AIN1(+)
AIN1(-)
AIN2(+)
AIN2(-)
MUX
IN-AMP
REFIN(+)
DOUT/RDY
DIN
SCLK
CS
DVDD
AVDD
GND
PWRSW
Figure 12.
P
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