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參數(shù)資料
| 型號： | 9042RPFE |
| 廠商： | MAXWELL TECHNOLOGIES |
| 元件分類： | ADC |
| 英文描述： | 12-Bit, 41 MSPS A/D Converter |
| 中文描述： | 1-CH 12-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, DFP28 |
| 封裝： | RAD PAK, LDFP-28 |
| 文件頁數(shù)： | 16/26頁 |
| 文件大小： | 396K |
| 代理商： | 9042RPFE |
M
16
All data sheets are subject to change without notice
2005 Maxwell Technologies
All rights reserved.
12-Bit, 41 MSPS A/D Converter
9042
01.07.05 REV 7
THEORY OF OPERATION
The 9042 analog-to-digital converter (ADC) employs a twostage subrange architecture. This design approach ensures
12-bit accuracy, without the need for laser trim at low power. As shown in the functional block diagram the 1 V p-p
SingleEnded analog input, centered at 2.4 V, drives a single-in to differential-out amplifier, A1. The output of A1 drives
the first track-and-hold, TH1. The high state of the ENCODE pulse places TH1 in hold mode. The held value of TH1 is
applied to the input of the 6-bit coarse ADC. The digital output of the coarse ADC drives a 6-bit DAC; the DAC is 12
bits accurate. The output of the 6-bit DAC is subtracted fromthe delayed analog signal at the input to TH3 to generate
a residue signal. TH2 is used as an analog pipeline to null out the digital delay of the coarse ADC. The residue signal
is passed to TH3 on a subsequent clock cycle where the signal is amplified by the residue amplifier, A2, and converted
to a digital word by the 7-bit residue ADC. One bit of overlap is used to accommodate any linearity errors in the coarse
ADC.
The 6-bit coarse ADC word and 7-bit residue word are added together and corrected in the digital error correction logic
to generate the output word. The result is a 12-bit parallel digital word which is CMOS-compatible, coded as twos com-
plement.
APPLYING THE 9042
Encoding the 9042
The 9042 is designed to interface with TTL and CMOS logic famlies. The source used to drive the ENCODE pin(s)
must be clean and free fromjitter. Sources with excessive jitter will limt SNR (ref. Equation 1 under “Noise Floor and
SNR”).
Figure 19. Single-Ended TTL/CMOS Encode
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| 9042RPFH | 12-Bit, 41 MSPS A/D Converter |
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| 904BC | Super Flux LEDs |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 9042RPFH | 制造商:MAXWELL 制造商全稱:Maxwell Technologies 功能描述:12-Bit, 41 MSPS A/D Converter |
| 9042RPFI | 制造商:MAXWELL 制造商全稱:Maxwell Technologies 功能描述:12-Bit, 41 MSPS A/D Converter |
| 9042RPFK | 制造商:MAXWELL 制造商全稱:Maxwell Technologies 功能描述:12-Bit, 41 MSPS A/D Converter |
| 904-2-T43-1-MTF-LR0-0-0-0-0A03 | 制造商:MPE-Garry GmbH 功能描述: |
| 9043 | 功能描述:電路板硬件 - PCB FEMALE SUPPORT .500" NYLON UL 94V-0 RoHS:否 制造商:Harwin 類型:Shield Clip 長度:9.4 mm 螺紋大小: 外徑: 材料:Beryllium Copper 電鍍:Tin |
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