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参数资料
| 型号： | AD9000SE |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | ADC |
| 英文描述： | High Speed 6-Bit A/D Converter |
| 中文描述： | 1-CH 6-BIT FLASH METHOD ADC, PARALLEL ACCESS, CQCC28 |
| 封装： | CERAMIC, LCC-28 |
| 文件页数： | 6/8页 |
| 文件大小： | 205K |
| 代理商： | AD9000SE |
AD9000
–6–
REV. A
ABOUT THE AD9000
Analog Bandwidth
Quantifying the high frequency analog performance of the
AD9000 is somewhat difficult because of the various criteria
that can be applied. At one extreme there is the analog input
bandwidth of a single input comparator (which tends to be
extremely high). At the other end of the performance criteria is
the “no missing codes” restriction, which tends to be the most
conservative measure of analog bandwidth.
The “no missing codes” criteria simply means that the converter
is capable of generating all 64 output codes for an analog and
ENCODE frequency. At higher ENCODE rates to analog
frequencies, the converter continues to function, but with
reduced resolution. The graph below details the “no missing
codes” region of operation for the AD9000 at several reference
levels. Note that nearly all analog-to-digital converter applica-
tions operate in the oversampled region to avoid generation of
indeterminate data (aliasing).
Figure 4. Analog Input vs. Encode Rate “No Missing
Codes”
High-Speed Performance Enhancements
The AD9000 employs a hysteresis control pin which affects
comparator sensitivity. The error rate (number of full-scale
errors in a given period) is directly affected by the comparator
sensitivity. By varying the voltage on the hysteresis control pin,
the error rate can be reduced. The AD9000 is capable of ex-
tremely low error rate operation, which makes it ideal for error
sensitive applications such as QAM demodulation. If the
hysteresis control pin is used, it should be decoupled to
ground through a 0.1
μ
F capacitor, otherwise it may be left
floating.
At the highest encode rates, overall accuracy can be improved
by skewing the ENCODE signal duty-cycle to allow more time
in the “latch” mode. Specifically, extending the logic HIGH
portion of the ENCODE signal allows the comparators more
time to achieve an appropriate logic level prior to the decoding
cycle that begins on the rising edge of the ENCODE pulse.
Figure 5. Comparator Switching vs. Hysteresis Voltage
Layout Considerations
The AD9000, like all high-speed circuits, requires certain
precautions be taken to ensure optimum performance. The
foremost of these is the use of a substantial low impedance
ground plane around and under the AD9000. Just as important
are high quality ground connections to the AD9000 itself. It is
probably more effective to keep the analog and digital grounds
separate, except at the AD9000 where they should be connected
together. Sockets should generally be avoided due to the in-
creased interlead capacitance they induce. If socketing must be
used, pin sockets are preferred.
Decoupling is especially important to high-speed analog circuits.
Each supply should be decoupled to ground with 0.1
μ
F ceramic
and 0.001
μ
F mica capacitors. The ladder reference pins should
be treated in a similar manner. In addition to decoupling the
reference ladder, the reference ladder should be driven from a
low output impedance source for the best noise rejection. In
all cases where practical, chip capacitors are recommended to
reduce the effects of lead inductance associated with standard
discrete capacitors.
MIL-STD-883 Compliance Information
The AD9000SE/SD/883C are classified within microcircuits
group 57-technology group D (bipolar A/D converters), and are
constructed in accordance with the latest revision of MIL-STD-
883. The AD9000 is electrostatic sensitive and falls within
electrostatic sensitivity classification Category A. PDA (Percent
Defective Allowance) is computed based on Subgroups 1 of the
specified Group A test list. QA screening is in accordance with
“Alternate Method A” of method 5005. The following apply:
Burn-In per 1015, Life Test per 1005, Electrical Testing per
5004. (Note: Group A electrical Testing assumes T
A
=
T
C
=
T
J
.)
相关PDF资料 |
PDF描述 |
|---|---|
| AD9000JD | High Speed 6-Bit A/D Converter |
| AD9002 | High Speed 8-Bit Monolithic A/D Converter |
| AD9002AD | High Speed 8-Bit Monolithic A/D Converter |
| AD9002AJ | High Speed 8-Bit Monolithic A/D Converter |
| AD9002BD | High Speed 8-Bit Monolithic A/D Converter |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AD9000SE/883B | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Analog Devices 功能描述: |
| AD9000SQ/883B | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog-to-Digital Converter， 6-Bit |
| AD9002 | 制造商:AD 制造商全称:Analog Devices 功能描述:High Speed 8-Bit Monolithic A/D Converter |
| AD9002AD | 制造商:Rochester Electronics LLC 功能描述:8 BIT 150 MSPS ADC - Bulk |
| AD9002AJ | 制造商:Analog Devices 功能描述: 制造商:Rochester Electronics LLC 功能描述:8-BIT 150 MSPS ADC - Bulk 制造商:Analog Devices 功能描述:IC 8BIT MONOLITHIC CONVERTER 9002 |
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