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參數(shù)資料
| 型號(hào)： | AD7788ARM |
| 廠商： | Analog Devices Inc |
| 文件頁(yè)數(shù)： | 4/20頁(yè) |
| 文件大小： | 0K |
| 描述： | IC ADC 16BIT SIGMA-DELTA 10-MSOP |
| 標(biāo)準(zhǔn)包裝： | 50 |
| 位數(shù)： | 16 |
| 采樣率（每秒）： | 16.6 |
| 數(shù)據(jù)接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 230µW |
| 電壓電源： | 單電源 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類(lèi)型： | 表面貼裝 |
| 封裝/外殼： | 10-TFSOP，10-MSOP（0.118"，3.00mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 10-MSOP |
| 包裝： | 管件 |
| 輸入數(shù)目和類(lèi)型： | 1 個(gè)差分，單極；1 個(gè)差分，雙極 |
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AD7788/AD7789
Rev. B | Page 12 of 20
Table 8. Register Selection
RS1
RS0
Register
Register Size
0
Communications register during a write operation
8-bit
0
Status register during a read operation
8-bit
0
1
Mode register
8-bit
1
0
Reserved
8-bit
1
Data register
16-bit (AD7788)
24-bit (AD7789)
Table 9. Channel Selection
CH1
CH0
Channel
0
AIN(+) AIN()
0
1
Reserved
1
0
AIN() AIN()
1
VDD monitor
STATUS REGISTER
(RS1, RS0 = 0, 0; Power-On/Reset = 0x88 for AD7788 and 0x8C for AD7789)
The status register is an 8-bit, read only register. To access the ADC status register, the user must write to the communications register,
select the next operation to be a read, and load Bit RS1 and Bit RS0 with 0. Table 10 outlines the bit designations for the status register.
SR0 through SR7 indicate the bit locations, SR denoting the bits are in the status register. SR7 denotes the first bit of the data stream. The
number(s) in brackets indicates the power-on/reset default status of that bit.
MSB
LSB
SR7
SR6
SR5
SR4
SR3
SR2
SR1
SR0
RDY[1]
ERR[0]
0[0]
1[1]
WL[1/0]
CH1[0]
CH0[0]
Table 10. Status Register Bit Designations
Bit Location
Bit Name
Description
SR7
RDY
Ready Bit for ADC. Cleared when data is written to the ADC data register. The RDY bit is set automatically
after the ADC data register has been read or a period of time before the data register is updated with a
new conversion result to tell the user not to read the conversion data. It is also set when the part is
placed in power-down mode. The end of a conversion is indicated by the DOUT/RDY pin. This pin can be
used as an alternative to the status register for monitoring the ADC for conversion data.
SR6
ERR
ADC Error Bit. This bit is written to at the same time as the RDY bit. Set to indicate that the result written
to the ADC data register has been clamped to all 0s or all 1s. Error sources include overrange, under-
range. Cleared by a write operation to start a conversion.
SR5
0
This bit is cleared automatically.
SR4
0
This bit is cleared automatically.
SR3
1
This bit is set automatically.
SR2
WL
AD7788/AD7789 Identifier. This bit is cleared automatically if the device is an AD7788 and it is set
automatically if the device is an AD7789. This bit is used to distinguish between the AD7788 and
AD7789.
SR1 to SR0
CH1 to CH0
These bits indicate which channel is being converted by the ADC.
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