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參數(shù)資料
| 型號(hào)： | AD9020KE |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | CONNECTOR |
| 中文描述： | 1-CH 10-BIT FLASH METHOD ADC, PARALLEL ACCESS, CQCC68 |
| 封裝： | CERAMIC, LCC-68 |
| 文件頁數(shù)： | 7/12頁 |
| 文件大?。?/td> | 204K |
| 代理商： | AD9020KE |
AD9020
–7–
REV. A
Digitizing Oscilloscopes
Oscilloscopes provide amplitude information about an observed
waveform with respect to time. Digitizing oscilloscopes must ac-
curately sample this signal, without distorting the information to
be displayed.
One figure of merit for the ADC in these applications is
Effective
Number of Bits (ENOBs).
ENOB is calculated with a sine wave
curve fit and equals:
ENOB = N – LOG
2
[
Error
(
measured
)
/Error (ideal
)]
N
is the resolution (number of bits) of the ADC. T he measured
error is the actual rms error calculated from the converter out-
puts with a pure sine wave input.
T he
Analog Bandwidth
of the converter is the analog input fre-
quency at which the spectral power of the fundamental signal is
reduced 3 dB from its low frequency value. T he analog band-
width is a good indicator of a converter’s stewing capabilities.
T he
Maximum Conversion Rate
is
defined as the encode rate at
which the SNR for the lowest analog signal test frequency tested
drops by no more than 3 dB below the guaranteed limit.
Imaging
Visible and infrared imaging systems both require similar char-
acteristics from ADCs. T he signal input (from a CCD camera,
or multiplexer) is a time division multiplexed signal consisting of
a series of pulses whose amplitude varies in direct proportion to
the intensity of the radiation detected at the sensor. T hese vary-
ing levels are then digitized by applying encode commands at
the correct times, as shown below.
ENCODE
A
IN
AD9020
FS
+
FS
–
Imaging Application Using AD9020
T he actual resolution of the converter is limited by the thermal
and quantization noise of the ADC. T he low frequency test for
SNR or ENOB is a good measure of the noise of the AD9020.
At this frequency, the static errors in the ADC determine the
useful dynamic range of the ADC.
Although the signal being sampled does not have a significant
slew rate, this does not imply dynamic performance is not im-
portant. T he
Transient Response and Overvoltage Recovery Time
specifications insure that the ADC can track full-scale changes
in the analog input sufficiently fast to capture a valid sample.
Transient Response
is
the time required for the AD9020 to
achieve full accuracy when a step function is applied.
Overvolt-
age Recovery Time
is
the time required for the AD9020 to re-
cover to full accuracy after an analog input signal 150% of full
scale is reduced to the full-scale range of the converter.
Professional Video
Digital Signal Processing (DSP) is now common in television
production. Modern studios rely on digitized video to create
state-of-the-art special effects. Video instrumentation also re-
quires high resolution ADCs for studio quality measurement
and frame storage.
T he AD9020 provides sufficient resolution for these demanding
applications. Conversion speed, dynamic performance and ana-
log bandwidth are suitable for digitizing both composite and
RGB video sources.
相關(guān)PDF資料 |
PDF描述 |
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| AD9020KZ | 10-Bit 60 MSPS A/D Converter |
| AD9020PCB | 10-Bit 60 MSPS A/D Converter |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD9020KJ | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| AD9020KZ | 制造商:Rochester Electronics LLC 功能描述:10 BIT 60 MSPS TTL ADC - Bulk |
| AD9020PCB | 制造商:AD 制造商全稱:Analog Devices 功能描述:10-Bit 60 MSPS A/D Converter |
| AD9020SE/883 | 制造商:AD 制造商全稱:Analog Devices 功能描述:10-Bit 60 MSPS A/D Converter |
| AD9020SZ/883 | 制造商:AD 制造商全稱:Analog Devices 功能描述:10-Bit 60 MSPS A/D Converter |
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