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參數(shù)資料
| 型號(hào)： | TLC876CPWLE |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | ADC |
| 英文描述： | 1-CH 10-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PDSO28 |
| 封裝： | TSSOP-28 |
| 文件頁數(shù)： | 9/23頁 |
| 文件大?。?/td> | 305K |
| 代理商： | TLC876CPWLE |
TLC876M, TLC876I, TLC876C
10-BIT 20 MSPS PARALLEL OUTPUT CMOS
ANALOG-TO-DIGITAL CONVERTERS
SLAS140C – JULY 1997 – REVISED MAY 1999
17
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
dc considerations (continued)
2.5
2
0.5
0
0.5
1
1.5
2
2.5
3
REFTF
,REFTS
3.5
4.5
REFBF, REFBS
5
3.5
4
1.5
4
3
1
2 V Span
1 V Span
Figure 18. TLC876 Reference Ranges
ac considerations
The simplified diagram of Figure 17 shows that the reference terminals connect to a capacitor for one half of
the clock period. The size of the capacitor is a function of the analog input voltage, therefore producing dynamic
impedance changes at the reference inputs.
The external reference source must be able to maintain a low impedance over all frequencies of interest to
provide the charge required by the capacitance. By supplying the requisite charge, the reference voltages
remain relatively constant maintaining specified performance. For some reference configurations, voltage
transients are present on the reference lines, especially during the falling edge of CLK. The reference must
recover from the transients and settle to the desired level of accuracy prior to the rising edges of CLK.
Several useful reference configurations can be used depending on the application, desired level of accuracy,
and cost tradeoffs. The simplest configuration, shown in Figure 19, utilizes a resistor divider to generate the
reference voltages from the converters analog power supply. The 0.1
F bypass capacitors reduce high
frequency transients. The 10
F capacitors reduce the impedances at the REFTF and REFBF terminals at lower
frequencies; however, as input frequencies approach dc, the capacitors become ineffective, and small voltage
deviations appear across the biasing resistors. This reference method maintains 10-bit accuracy for input
frequencies above approximately 200 Hz and 8-bit accuracy applications for input frequencies above
approximately 50 Hz.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TLC876CPWR | 制造商:TI 制造商全稱:Texas Instruments 功能描述:10-BIT 20 MSPS PARALLEL OUTPUT CMOS ANALOG-TO-DIGITAL CONVERTERS |
| TLC876EVM | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Texas Instruments 功能描述: |
| TLC876I | 制造商:TI 制造商全稱:Texas Instruments 功能描述:10-BIT 20 MSPS PARALLEL OUTPUT CMOS ANALOG-TO-DIGITAL CONVERTERS |
| TLC876IDB | 制造商:TI 制造商全稱:Texas Instruments 功能描述:10-BIT 20 MSPS PARALLEL OUTPUT CMOS ANALOG-TO-DIGITAL CONVERTERS |
| TLC876IDBLE | 制造商:TI 制造商全稱:Texas Instruments 功能描述:10-BIT 20 MSPS PARALLEL OUTPUT CMOS ANALOG-TO-DIGITAL CONVERTERS |
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