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參數(shù)資料
| 型號： | ADS7844E |
| 元件分類： | 通用總線功能 |
| 英文描述： | CMOS 8-Stage Presettable 8-Bit Binary Synchronous Down Counter 16-SO -55 to 125 |
| 中文描述： | 12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)： | 11/14頁 |
| 文件大?。?/td> | 204K |
| 代理商： | ADS7844E |
11
ADS7844
FIGURE 3. Conversion Timing, 24-Clocks per Conversion, 8-Bit Bus Interface. No DCLK delay required with dedicated
serial port.
1
DCLK
CS
8
1
11
DOUT
BUSY
S
DIN
CONTROL BITS
S
CONTROL BITS
10
9
8
7
6
5
4
3
2
1
0
11 10
9
8
1
1
8
FIGURE 4. Conversion Timing, 16-Clocks per Conversion, 8-bit Bus Interface. No DCLK delay required with dedicated
serial port.
Bit 7
(MSB)
Bit 0
(LSB)
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
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. A new control byte starts with every 15th clock
cycle.
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.
3
—
Not Used.
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.
The SGL/DIF bit controls the multiplexer input mode: either
single-ended (HIGH) or differential (LOW). In single-ended
mode, the selected input channel is referenced to the COM
pin. In differential mode, the two selected 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 as shown in Table V. If both inputs are HIGH,
the device is always powered up. If both inputs 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.
16-Clocks per Conversion
The control bits for conversion n+1 can be overlapped with
conversion ‘n’ to allow for a conversion every 16 clock
cycles, as shown in Figure 4. This figure also shows possible
serial communication occurring with other serial peripherals
between each byte transfer between the processor and the
converter. This is possible provided that each conversion
completes within 1.6ms of starting. Otherwise, the signal
that has been captured on the input sample/hold may droop
enough to affect the conversion result. In addition, the
ADS7844 is fully powered while other serial communica-
tions are taking place.
t
ACQ
Acquire
Idle
Conversion
Idle
1
DCLK
CS
8
1
11
DOUT
BUSY
(MSB)
(START)
(LSB)
A2
S
DIN
A1
A0
DIF
PD1 PD0
10
9
8
7
6
5
4
3
2
1
0
Zero Filled...
8
1
8
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ADS7844EB | CMOS 8-Stage Presettable 8-Bit Binary Synchronous Down Counter 16-SO -55 to 125 |
| ADS7844N | 12-Bit, 8-Channel Serial Output Sampling ANALOG-TO-DIGITAL CONVERTER |
| ADS7844NB | CMOS 8-Stage Presettable 8-Bit Binary Synchronous Down Counter 16-TSSOP -55 to 125 |
| ADS7845 | CMOS 8-Stage Presettable 8-Bit Binary Synchronous Down Counter 16-TSSOP -55 to 125 |
| ADS7845E | TOUCH SCREEN CONTROLLER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADS7844E/2K5 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADS7844E/2K5G4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADS7844EB | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADS7844EB/2K5 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADS7844EB/2K5G4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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