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參數資料
| 型號： | AD7994 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 4-Channel, 12-/10-Bit ADCs with I2C Compatible Interface in 16-Lead TSSOP |
| 中文描述： | 4通道，12-/10-Bit ADC的16 - I2C兼容接口的無鉛TSSOP封裝 |
| 文件頁數： | 17/27頁 |
| 文件大?。?/td> | 277K |
| 代理商： | AD7994 |
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AD7994/AD7993
–17–
REV. PrF
PRELIMINARY TECHNICAL DATA
CONVERSION RESULT REGISTER
The Conversion Result Register is a 16-bit read-only reg-
ister which stores the conversion result from the ADC in
Straight Binary format. A Two Byte read is necessary to
read data from this register. Table VIIa shows the contents
of the first byte to be read while Table VIIb show the
contents of the second byte to be read from AD7994/
AD7993.
Table VIIa. Conversion Value Register (First Read)
The AD7994/AD7993 conversion result consists of an
Alert_Flag bit, a leading zero, two Channel Identifier bits
and the 12-/10- bit data result. For the AD7993 the two
LSBs (D1 and D0) of the second read will contain two
zeros.
The Alert_Flag bit indicates whether the conversion result
being read or any other channel result has violated the
limit registers associated with it. The Master may wish to
read the ALERT Status register to obtain more informa-
tion on where the ALERT occurred if this Alert_Flag bit
is set.
This is followed by a leading zero and the two Channel
Indentifier bits indicating which channel the conversion
result corresponds to. The 12-/10-bit conversion result
then follows MSB first.
Table VI. ALERT/BUSY Function
D2
D1
ALERT/BUSY Pin Configuration
0
0
Pin does not provide any interrupt signal.
0
1
Pin configured as a BUSY output.
1
0
Pin configured as an ALERT output.
1
1
Resets ALERT output pin, Alert_Flag bit in
Conversion Result Reg, and entire Alert
Status Reg ( if any active).
Note 1:-
The AD7994/AD7994 converts on the selected channel in the Sequence in ascending order, starting with the
lowest channel in the sequence.
Table V. Channel Selection
D7
D6
D5 D4
Analog Input Channel
0
0
0 0
No channel selected, see Address Pointer Byte, Mode 2
0
0
0 1
Convert on V
IN
1
Convert on V
IN
2
Sequence between V
IN
1 and V
IN
2
Convert on V
IN
3
Sequence between V
IN
1 and V
IN
3
Sequence between V
IN
2 and V
IN
3
Sequence between V
IN
1, V
IN
2 and V
IN
3
Convert on V
IN
4
Sequence between V
IN
1 and V
IN
4
Sequence between V
IN
2 and V
IN
4
Sequence between V
IN
1, V
IN
2 and V
IN
4
Sequence between V
IN
3 and V
IN
4
Sequence between V
IN
1, V
IN
3 and V
IN
4
Sequence between V
IN
2, V
IN
3 and V
IN
4
Sequence between V
IN
1, V
IN
2, V
IN
3 and V
IN
4
0
0
1 0
0
0
1 1
0
1
0 0
0
1
0 1
0
1
1 0
0
1
1 1
1
0
0 0
1
0
0 1
1
0
1 0
1
0
1 1
1
1
0 0
1
1
0 1
1
1
1 0
1
1
1 1
Alert_Flag
1
Zero CH
ID1
CH
ID0
Channel# Result
0/1
0
0
0
Channel 1(V
IN
1)
Channel 2(V
IN
2)
Channel 3(V
IN
3)
Channel 4(V
IN
4)
0/1
0
0
1
0/1
0
1
0
0/1
0
1
1
Table VIIb. Conversion Value Register (Second Read)
D7
D6
D5
D4
D3
D2
D1
D0
B7
B6
B5
B4
B3
B2
B1/0
B0/0
D15
D14
D13
D12
D11
D10
D9
D8
Alert_Flag Zero CH
ID1
CH
ID0
MSB B10
B9
B8
If 1/1 is written to bits D2/D1 in the configuration Regis-
ter to reset the ALERT pin, the Alert Flag bit and the
Alert Status Register; the contents of the Configuration
Register will read 1/0 for D2/D1 respectively if read back.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| AD7994-0 | 制造商:AD 制造商全稱:Analog Devices 功能描述:4-Channel, 10- and 12-Bit ADCs with I2C Compatible Interface in 16-Lead TSSOP |
| AD7994-1 | 制造商:AD 制造商全稱:Analog Devices 功能描述:4-Channel, 10- and 12-Bit ADCs with I2C Compatible Interface in 16-Lead TSSOP |
| AD7994BRU-0 | 功能描述:IC ADC 12BIT 4CHAN I2C 16TSSOP RoHS:否 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:16 采樣率（每秒）:45k 數據接口:串行 轉換器數目:2 功率耗散（最大）:315mW 電壓電源:模擬和數字 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:28-SOIC W 包裝:帶卷 (TR) 輸入數目和類型:2 個單端，單極 |
| AD7994BRU-0REEL | 功能描述:IC ADC 12BIT 4CHAN I2C 16TSSOP RoHS:否 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:16 采樣率（每秒）:45k 數據接口:串行 轉換器數目:2 功率耗散（最大）:315mW 電壓電源:模擬和數字 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:28-SOIC W 包裝:帶卷 (TR) 輸入數目和類型:2 個單端，單極 |
| AD7994BRU-1 | 制造商:Analog Devices 功能描述:ADC Single SAR 188ksps 12-bit Serial 16-Pin TSSOP 制造商:Rochester Electronics LLC 功能描述: |
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