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參數資料
| 型號： | TLV2543CDWG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | ADC |
| 英文描述： | 11-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20 |
| 封裝： | GREEN, PLASTIC, SOIC-20 |
| 文件頁數： | 23/28頁 |
| 文件大小： | 553K |
| 代理商： | TLV2543CDWG4 |
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TLV2543C, TLV2543I
12-BIT ANALOG-TO-DIGITAL CONVERTERS
WITH SERIAL CONTROL AND 11 ANALOG INPUTS
SLAS096C – MARCH 1995 – REVISED JUNE 2000
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
converter operation
The operation of the converter is organized as a succession of two distinct cycles: 1) the I/O cycle, and 2) the
actual conversion cycle. The I/O cycle is defined by the externally provided I/O CLOCK and lasts 8, 12, or 16
clock periods depending on the selected output data length.
1.
I/O cycle
During the I/O cycle, two operations take place simultaneously.
a.
An 8-bit data stream consisting of address and control information is provided to DATA INPUT. This data
is shifted into the device on the rising edge of the first eight I/O CLOCKs. DATA INPUT is ignored after
the first eight clocks during 12- or 16-clock I/O transfers.
b.
The data output with a length of 8, 12, or 16 bits is provided serially on DATA OUT. When CS is held low,
the first output data bit occurs on the rising edge of EOC. When CS is negated between conversions, the
first output data bit occurs on the falling edge of CS. This data is the result of the previous conversion
period, and after the first output data bit each succeeding bit is clocked out on the falling edge of each
succeeding I/O CLOCK.
2.
Conversion cycle
The conversion cycle is transparent to the user, and it is controlled by an internal clock synchronized to the
I/O CLOCK. During the conversion period, the device performs a successive-approximation conversion on
the analog input voltage. The EOC output goes low at the start of the conversion cycle and goes high when
conversion is complete and the output data register is latched. A conversion cycle is started only after the I/O
cycle is completed, which minimizes the influence of external digital noise on the accuracy of the
conversion.
power up and initialization
After power up, CS must be taken from high to low to begin an I/O cycle. EOC is initially high, and the input data
register is set to all zeros. The contents of the output data register are random, and the first conversion result
should be ignored. To initialize during operation, CS is taken high and returned low to begin the next I/O cycle.
The first conversion after the device has returned from the power-down state may not read accurately due to
internal device settling.
operational terminology
Previous (N – 1) conversion cycle
The conversion cycle prior to the current I/O cycle.
Current (N) I/O cycle
The entire I/O CLOCK sequence that transfers address and control data into the data register and clocks
the digital result from the previous conversion cycle from DATA OUT. The last falling edge of the clock in
the I/O CLOCK sequence signifies the end of the current I/O cycle.
Current (N) conversion cycle
Immediately after the current I/O cycle, the current conversion cycle starts. When the current conversion
cycle is complete, the current conversion result is loaded into the output register.
Current (N) conversion result
The result of the current conversion cycle that is serially shifted out during the next I/O cycle.
Next (N + 1) I/O cycle
The I/O cycle after the current conversion cycle.
Example: In the 12-bit mode, the result of the current conversion cycle is a 12-bit serial-data stream clocked out during
the next I/O cycle. The current I/O cycle must be exactly 12 bits long to maintain synchronization, even
when this corrupts the output data from the previous conversion. The current conversion begins
immediately after the twelfth falling edge of the current I/O cycle.
data input
The data input is internally connected to an 8-bit serial-input address and control register. The register defines
the operation of the converter and the output data length. The host provides the data word with the MSB first.
Each data bit is clocked in on the rising edge of the I/O CLOCK sequence (see Table 1 for the data register
format).
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| TLV2543CDWR | 功能描述:模數轉換器 - ADC 12-Bit 66 kSPS Serial Out 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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