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參數(shù)資料
| 型號： | ADS8344 |
| 英文描述： | 16-Bit, 8-Channel Serial Output Sampling ANALOG-TO-DIGITAL CONVERTER |
| 中文描述： | 16位，8通道串行輸出采樣模擬到數(shù)字轉(zhuǎn)換器 |
| 文件頁數(shù)： | 10/13頁 |
| 文件大?。?/td> | 278K |
| 代理商： | ADS8344 |
10
ADS8344
inputs provide a differential input. See Tables I and II and
Figure 2 for more information. The last two bits (PD1 - PD0)
select the power-down mode and clock mode as shown in
Table V. If both PD1 and PD0 are HIGH, the device is
always powered up. If both PD1 and PD0 are low, the device
enters a power-down mode between conversions. When a
new conversion is initiated, the device will resume normal
operation instantly—no delay is needed to allow the device
to power up and the very first conversion will be valid.
Clock Modes
The ADS8344 can be used with an external serial clock or
an internal clock to perform the successive-approximation
conversion. In both clock modes, the external clock shifts
data in and out of the device. Internal clock mode is selected
when PD1 is HIGH and PD0 is LOW.
External Clock Mode
In external clock mode, the external clock not only shifts
data in and out of the ADS8344, it also controls the A/D
conversion steps. BUSY will go HIGH for one clock period
after the last bit of the control byte is shifted in. Successive-
approximation bit decisions are made and appear at DOUT
on each of the next 16 SCLK falling edges (Figure 3). Figure
4 shows the BUSY timing in external clock mode.
FIGURE 3. Conversion Timing, 24-Clocks per Conversion, 8-Bit Bus Interface. No DCLK delay required with dedicated
serial port.
t
ACQ
Acquire
Idle
Conversion
1
DCLK
CS
8
1
15
DOUT
BUSY
(MSB)
(START)
(LSB)
A2
S
DIN
A1
A0
DIF
PD1 PD0
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Zero Filled...
8
1
8
Acquire
Idle
Conversion
1
8
1
15
(MSB)
(START)
A2
S
A1
A0
SGL/
DIF
PD1 PD0
14
Bit 7
(MSB)
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
(LSB)
S
A2
A1
A0
—
SGL/DIF
PD1
PD0
TABLE III. Order of the Control Bits in the Control Byte.
TABLE IV.Descriptions of the Control Bits within the
Control Byte.
BIT
NAME
DESCRIPTION
7
S
Start Bit. Control byte starts with first HIGH bit on
DIN.
6 - 4
A2 - A0
Channel Select Bits. Along with the SGL/DIF bit,
these bits control the setting of the multiplexer input
as detailed in Tables I and II.
2
SGL/DIF
Single-Ended/Differential Select Bit. Along with bits
A2 - A0, this bit controls the setting of the multiplexer
input as detailed in Tables I and II.
1 - 0
PD1 - PD0
Power-Down Mode Select Bits. See Table V for
details.
PD0
0
PD1
0
Description
Power-down between conversions. When each
conversion is finished, the converter enters a low
power mode. At the start of the next conversion,
the device instantly powers up to full power. There
is no need for additional delays to assure full
operation and the very first conversion is valid.
0
1
Internal clock mode.
1
0
Reserved for future use.
1
1
No power-down between conversions, device al-
ways powered.
TABLE V. Power-Down Selection.
FIGURE 4. Detailed Timing Diagram.
PD0
t
BDV
t
DH
t
CH
t
CL
t
DS
t
CSS
t
DV
t
BD
t
BD
t
TR
t
BTR
t
D0
t
CSH
DCLK
CS
15
DOUT
BUSY
DIN
14
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADS8344E | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16-Bit 8-Ch Serial Output Sampling RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)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 |
| ADS8344E | 制造商:Texas Instruments 功能描述:IC's |
| ADS8344E | 制造商:Texas Instruments 功能描述:16BIT ADC SERIAL O/P SMD 8344 |
| ADS8344E/2K5 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16-Bit 8-Ch Serial Output Sampling RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)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 |
| ADS8344E/2K5G4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16-Bit 8-Ch Serial Output Sampling RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)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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