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參數(shù)資料
| 型號： | ADS7823EB2K5 |
| 英文描述： | 12-Bit, Sampling A/D Converter with I2C?? INTERFACE |
| 中文描述： | 12位，采樣A / D轉換器，帶有I2C？？接口 |
| 文件頁數(shù)： | 11/15頁 |
| 文件大?。?/td> | 275K |
| 代理商： | ADS7823EB2K5 |
ADS7823
SBAS180B
11
MSB
6
5
4
3
2
1
LSB
BYTE0
0
0
0
0
D11
D10
D9
D8
BYTE1
D7
D6
D5
D4
D3
D2
D1
D0
READING DATA
Data can be read from the ADS7823 by read-addressing the
part (LSB of address byte set to 1) and receiving the
transmitted bytes. Converted data can only be read from the
ADS7823 once a conversion has been initiated as described
in the preceding section.
Each 12-bit data word is returned in two bytes, as shown
below, where D11 is the MSB of the data word, and D0 is the
LSB. Byte 0 is sent first, followed by Byte 1.
READING IN F/S MODE
In Fast and Standard (F/S) modes, the A/D converter has
time to make four complete conversions between the recep-
tion of bit 5 of the command byte and the complete reception
of the read address, even when operating in Fast mode.
Because the ADS7823 can perform these conversions much
faster than they can be transmitted in F/S mode, data is
stored in a four-level FILO. During the read operation, the A/
D converter is powered down and the contents of the stack
are read out one by one in the correct order.
A typical transfer sequence for reading four words of data in
F/S mode (see Figure 3). Note that the master sends a not-
acknowledge after the fourth data word has been read. This
tells the ADS7823 that no further reads will be performed. No
more than four data words should be read at a time; further
reads will return undefined data.
Although a STOP condition is shown at the end of the figure,
it is permissible to issue a repeated START; this will have the
same effect.
READING IN HS MODE
High Speed (HS) mode is fast enough that codes can be
read out one at a time, without employing the FILO. In HS
mode there is not enough time for a single conversion to
complete between the reception of command bit 5 and the
read address byte, so the ADS7823 stretches the clock after
the command byte has been fully received, holding it LOW
until the conversion is complete.
A typical read sequence for HS mode is shown in Figure 4.
Included in the read sequence is the shift from
F/S to HS modes. It may be desirable to remain in HS mode
after reading a code; to do this, issue a repeated START
instead of a STOP at the end of the read sequence, since a
STOP causes the part to return to F/S mode.
It is very important not to read more than one code at a time
from the ADS7823 during HS mode. If codes are read out
more than one at a time, as in F/S mode, the results for all
codes (except the first) are undefined, and the data stream
will be corrupt.
FIGURE 4. Typical Read Sequence in HS Mode.
Sr
1
0
0
1
0
A1
A0
R
A
0
0
0
0
D11D10D9
D8
A
D7D6 . . .D1D0
N
P
Read-Addressing Byte
(see Note A)
2
×
(8 bits + ack/not-ack)
From master to slave
From slave to master
ADC Power-Down Mode
W = 0 (WRITE)
R = 1 (READ)
S
X
0
0
0
0
1
X
X
N
F/S Mode
HS Mode Master Code
Sr
A1
1
0
0
1
0
A0
W
A
0
0
0
X
X
X
X
X
A
Write-Addressing Byte
Command Byte
ADC Wake-Up Mode
SCLH is stretched in wait-state
HS Mode Enabled
ADC Power-Down Mode
HS Mode Enabled
Return to
F/S Mode
See Note B
A = acknowledge (SDA Low)
N = not-acknowledge (SDA High)
S = START Condition
P = STOP Condition
Sr = repeated START Condition
NOTES: (A) Failure for master to send read-addressing byte
—
setting R/W flag to
“
1
”—
will result in internal clock remaining ON, increasing power consumption.
(B) Use repeated START to remain in HS mode instead of STOP.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ADS7824 | 制造商:BB 制造商全稱:BB 功能描述:4 Channel, 12-Bit Sampling CMOS A/D Converter |
| ADS7824P | 功能描述:模數(shù)轉換器 - ADC 4-Channel 12-Bit Sampling CMOS RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結構:Sigma-Delta 轉換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADS7824P | 制造商:BURR-BROWN 功能描述:IC 12BIT ADC 7824 DIP28 制造商:Texas Instruments 功能描述:IC 12BIT ADC 40KHZ 7824 DIP28 制造商:Texas Instruments 功能描述:IC, 12BIT ADC, 40KHZ, 7824, DIP28 |
| ADS7824PB | 功能描述:模數(shù)轉換器 - ADC 4-Channel 12-Bit Sampling CMOS RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結構:Sigma-Delta 轉換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADS7824PBG4 | 功能描述:模數(shù)轉換器 - ADC 4-Channel 12-Bit Sampling CMOS RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結構:Sigma-Delta 轉換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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