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參數資料
| 型號： | TLC2558CDWR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | ADC |
| 英文描述： | 8-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20 |
| 封裝： | GREEN, PLASTIC, SOIC-20 |
| 文件頁數： | 10/48頁 |
| 文件大小： | 1072K |
| 代理商： | TLC2558CDWR |
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TLC2554, TLC2558
5-V, 12-BIT, 400 KSPS, 4/8 CHANNEL, LOW POWER,
SERIAL ANALOG-TO-DIGITAL CONVERTERS WITH AUTO POWER DOWN
SLAS220A –JUNE 1999
18
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
FIFO operation
76543210
ADC
12-BIT
×8
FIFO
OD
Serial
FIFO Full
FIFO 3/4 Full
FIFO 1/2 Full
FIFO 1/4 Full
FIFO Threshold Pointer
Figure 15. TLC2554/TLC2558 FIFO
The device has an 8 layer FIFO that can be programmed for different thresholds. An interrupt is sent to the host
after the preprogrammed threshold is reached. The FIFO can be used to store data from either a fixed channel
or a series of channels based on a preprogrammed sweep sequence. For example, an application may require
eight measurements from channel 3. In this case, the FIFO is filled with 8 data sequentially taken from channel
3. Another application may require data from channel 0, channel 2, channel 4, and channel 6 in an orderly
manner. Therefore, the threshold is set for 1/2 and the sweep sequence 0–2–4–6–0–2–4–6 is chosen. An
interrupt is sent to the host as soon as all four data are in the FIFO.
SCLK and conversion speed
There are multiple ways to adjust the conversion speed. The maximum equivalent conversion clock (fSCLK/DIV)
should not exceed 10 MHz.
D The SCLK is used as the source of the conversion clock and 14 conversion clocks are required to complete
a conversion plus 4 SCLKs overhead.
The devices can operate with an SCLK up to 20 MHz for the supply voltage range specified. The clock
divider provides speed options appropriate for an application where a high speed SCLK is used for faster
I/O. The total conversion time is 14
× (DIV/fSCLK) where DIV is 1 or 2. For example a 20-MHz SCLK with the
divide by 2 option produces a {14
× (2/20 M) + 4 × (1/20 MHz)} = 1.6 s conversion time.
D Auto power down can be used. This mode is always on. If the device is not accessed (by CS or CSTART),
the converter is powered down to save power. The built-in reference is left on in order to quickly resume
operation within one half SCLK period. This provides unlimited choices to trade speed with power savings.
reference voltage
The device has a built-in reference with a level of 4 V. If the internal reference is used, REFP is set to 4 V and
REFM is set to 0 V. An external reference can also be used through two reference input pins, REFP and REFM,
if the reference source is programmed as external. The voltage levels applied to these pins establish the upper
and lower limits of the analog inputs to produce a full-scale and zero-scale reading respectively. The values of
REFP, REFM, and the analog input should not exceed the positive supply or be lower than GND consistent with
the specified absolute maximum ratings. The digital output is at full scale when the input signal is equal to or
higher than REFP and at zero when the input signal is equal to or lower than REFM.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TLC2558CDWRG4 | 功能描述:模數轉換器 - ADC 12-bit 400 KSPS 8-Ch Serial w/Powerdown RoHS:否 制造商:Texas Instruments 通道數量: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 |
| TLC2558CPW | 功能描述:模數轉換器 - ADC 12bit 400KSPS ADC RoHS:否 制造商:Texas Instruments 通道數量: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 |
| TLC2558CPWG4 | 功能描述:模數轉換器 - ADC 12-bit 400 KSPS 8-Ch Serial w/Powerdown RoHS:否 制造商:Texas Instruments 通道數量: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 |
| TLC2558CPWR | 功能描述:模數轉換器 - ADC 12-bit 400 KSPS 8-Ch Serial w/Powerdown RoHS:否 制造商:Texas Instruments 通道數量: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 |
| TLC2558CPWRG4 | 功能描述:模數轉換器 - ADC 12-bit 400 KSPS 8-Ch Serial w/Powerdown RoHS:否 制造商:Texas Instruments 通道數量: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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