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參數(shù)資料
| 型號： | ADS7825PB |
| 英文描述： | 4 Channel, 16-Bit Sampling CMOS A/D Converter |
| 中文描述： | 4通道，16位采樣的CMOS A / D轉換 |
| 文件頁數(shù)： | 14/16頁 |
| 文件大?。?/td> | 342K |
| 代理商： | ADS7825PB |
14
ADS7825
conversions will proceed through each higher channel, cy-
cling back to zero after Channel 3.
If PWRD is held HIGH for a significant period of time, the
REF (pin 7) bypass capacitor may discharge (if the internal
reference is being utilized) and the CAP (pin 6) bypass
capacitor will discharge (for both internal and external
references). The continuous conversion mode should not be
enabled until the bypass capacitor(s) have recharged and
stabilized (1ms for 2.2
μ
F capacitors recommended). In
addition, the continuous conversion mode should not be
enabled even with a short pulse on PWRD until the mini-
mum acquisition time has been met.
MANUAL CHANNEL SELECTION (CONTC= 0V)
The channels of the ADS7825 can be selected manually by
using the A0 and A1 address pins (pins 19 and 18, respec-
tively). See Table IVb for the multiplexer truth table and
Figure 8 for channel selection timing.
into the A0 and A1 registers (pins 19 and 18, respectively)
prior to CONTC being raised HIGH, becomes the first
address in the sequential continuous conversion mode (e.g.,
if Channel 1 was the last address selected then Channel 2
will follow, then Channel 3, and so on). The A0 and A1
address inputs become outputs when the device is in this
mode. When BUSY rises at the end of a conversion, A0 and
A1 will output the address of the channel that will be
converted when BUSY goes LOW at the beginning of the
next conversion. Data will be valid for the previous channel
when BUSY rises. See Table IVa and Figure 7 for channel
selection timing in continuous conversion mode.
PWRD (pin 26) can be used to reset the multiplexer address
to zero. With the ADS7825 configured for no conversion,
PWRD can be taken HIGH for a minimum of 200ns. When
PWRD returns LOW, the multiplexer address will be reset
to zero. When the continuous conversion mode is enabled,
the first conversion will be done on channel 0. Subsequent
ADS7825 TIMING AND CONTROL
FIGURE 7. Channel Addressing in Continuous Conversion Mode (CONTC HIGH, CS and R/C LOW).
FIGURE 8. Channel Addressing in Normal Conversion Mode (CONTC and CS LOW).
0
0
1
1
0
1
0
1
AIN
3
AIN
0
AIN
1
AIN
2
AIN
0
AIN
1
AIN
2
AIN
3
DATA AVAILABLE
FROM CHANNEL
CHANNEL TO BE OR
BEING CONVERTED
A1
A0
DESCRIPTION OF OPERATION
Channel being acquired or converted is output on these
address lines. Data is valid for the previous channel. These
lines are updated when BUSY rises.
TABLE IVa. A0 and A1 Outputs (CONTC HIGH).
CHANNEL SELECTED
WHEN BUSY GOES HIGH
A1
A0
DESCRIPTION OF OPERATION
0
0
1
1
0
1
0
1
AIN
0
AIN
1
AIN
2
AIN
3
TABLE IVb. A0 and A1 Inputs (CONTC LOW).
Channel to be converted during conversion 'n + 1' is latched
when conversion 'n' is initiated (BUSY goes LOW). The selected
input starts being acquired as soon as conversion 'n' is done
(BUSY goes HIGH).
R/C
BUSY
A0, A1
(Input)
D7-D0
n – 3
n – 2
n – 1
n
n + 1
n + 2
n + 3
n – 1
n
n + 1
n + 2
n + 3
n + 4
n + 5
n + 4
n + 3
n + 2
n + 1
n
n – 1
n – 2
n + 4
Conversion Currently in Progress:
Channel Address for Conversion:
Results from Conversion:
t
30
BUSY
A0, A1
(Output)
D7-D0
n – 3
n – 2
n – 1
n
n + 1
n + 2
n + 3
n – 2
n – 1
n
n + 1
n + 2
n + 3
n + 4
n + 4
n + 3
n + 2
n + 1
n
n – 1
n – 2
n + 5
n + 4
Conversion Currently in Progress:
Channel Address for Conversion:
Results from Conversion:
t
29
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相關代理商/技術參數(shù) |
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| ADS7825PBG4 | 功能描述:模數(shù)轉換器 - ADC 4 Ch 16B Sampling CMOS ADC 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 |
| ADS7825PG4 | 功能描述:模數(shù)轉換器 - ADC 4 Channel 16-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 |
| ADS7825U | 功能描述:模數(shù)轉換器 - ADC 4 Channel 16-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 |
| ADS7825U | 制造商:BURR-BROWN 功能描述:16BIT ADC 4CH SMD 7825 SOIC28 |
| ADS7825U/1K | 功能描述:模數(shù)轉換器 - ADC 4 Channel 16-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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