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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： | 23/27頁 |
| 文件大小： | 277K |
| 代理商： | AD7994 |
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AD7994/AD7993
–23–
REV. PrF
PRELIMINARY TECHNICAL DATA
Figure 14. Reading two bytes of data from the Conversion
Result Register
Figure 13. Reading a single byte of data from a selected
register
device will win communication rights via standard I
2
C
arbitration during the slave address transfer.
The ALERT output becomes active when the value in the
Conversion Result Register exceeds the value in the
DATA
HIGH
Register or falls below the value in the
DATA
LOW
Register . It is reset when a write operation to
the Configuration register sets D1 to a 1, or when the
conversion result returns N LSBs below or above the value
stored in the DATA
HIGH
Register or DATA
LOW
Register
respectively. N is the value in the Hysteresis register. (See
Limit Registers section)
The ALERT output requires an external pull-up resistor.
This can be connected to a voltage different from V
DD
provided the maximum voltage rating of the ALERT out-
put pin is not exceeded. The value of the pull-up resistor
depends on the application, but should be as large as pos-
sible to avoid excessive sink currents at the ALERT out-
put.
ALERT/BUSY PIN
The ALERT/BUSY may be configured as an Alert or
Busy ouput as shown in Table VI.
SMBus ALERT
The AD7994/AD7993 ALERT output is an SMBus inter-
rupt line for devices that want to trade their ability to
master for an extra pin. The AD7994/AD7993 is a slave
only device and uses the SMBus ALERT to signal the
host device that it wants to talk. The SMBus ALERT on
the AD7994/AD7993 is used as an out of conversion
range indicator (a limit violation indicator).
The ALERT pin has an open-drain configuration which
allows the ALERT outputs of several AD7994/AD7993
devices to be wired-AND together when the ALERT pin
is active low. D0 of the Configuration Register is used to
set the active polarity of the ALERT output. The power-
up default is active low. The ALERT function can be
disabled or enabled by setting D2 of the Configuration
Register to 1 or 0 respectively.
The host device can process the ALERT interrupt and
simultaneously access all SMBus ALERT devices through
the alert response address. Only the device which pulled
the ALERT low will acknowledge the ARA (Alert Re-
sponse Address). If more than one device pulls the
ALERT pin low, the highest priority (lowest address)
SDA
NO ACK. BY
MASTER
START BY
MASTER
FRAME 1
SERIAL BUS ADDRESS BYTE
FRAME 2
SINGLE DATA BYTE FROM AD7994/3
ACK. BY
AD7994/3
1
9
1
9
D7
D6
D5
D2
D1
D0
R/
A0
A1
A2
A3
0
1
SCL
STOP BY
MASTER
D4
D3
0
SDA
ACK. BY
MASTER
START BY
MASTER
FRAME 1
SERIAL BUS ADDRESS BYTE
FRAME 2
MOST SIGNIFICANT DATA BYTE FROM
AD7994/3
ACK. BY
AD7994/3
1
9
1
9
Alert_
Flag
D10
D9
D8
R/
A0
A1
A2
A3
0
0
SCL
1
D11
NO ACK. BY
MASTER
FRAME 3
LEAST SIGNIFICANT DATA BYTE FROM
AD7994/3
1
9
D7
D6
D5
D2
D1/0
D0/0
STOP BY
MASTER
D4
D3
SCL (CONTINUED)
SDA (CONTINUED)
CH ID1CH ID0
0
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| AD7993BRU-1 | 4-Channel, 12-/10-Bit ADCs with I2C Compatible Interface in 16-Lead TSSOP |
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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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