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参数资料
| 型号： | HI5714EVAL |
| 厂商： | Intersil |
| 文件页数： | 1/11页 |
| 文件大小： | 0K |
| 描述： | EVALUATION PLATFORM HI5714 |
| 产品培训模块： | Solutions for Industrial Control Applications |
| 标准包装： | 1 |
| ADC 的数量： | 1 |
| 位数： | 8 |
| 采样率（每秒）： | 75M |
| 数据接口： | 并联 |
| 输入范围： | 2.7 Vpp |
| 在以下条件下的电源（标准）： | 325mW @ 75MSPS |
| 工作温度： | 0°C ~ 70°C |
| 已用 IC / 零件： | HI5714 |
| 已供物品： | 板 |
?
Using the HI5714 Evaluation Board
Application Note
November 2002
AN9517.1
Author: Juan C. Garcia
Description
The HI5714 evaluation board was designed to easily allow a
user to evaluate the performance of the HI5714 8-bit
75 MSPS Analog-to-Digital converter (ADC). The board
includes clock driver circuitry, reference voltage generators,
two input options and a reconstruct DAC. A block diagram of
the evaluation board is shown in Figure 3.
HI5714 Theory of Operation
The HI5714 design utilizes a folding and interpolating
architecture. This architecture reduces the number of
comparators, reference taps, and latches in comparison to a
full parallel flash converter, and as a result reduces power
requirements, die size and cost. A full parallel 8-bit flash
converter requires 255 comparators, 255 references and
255 latches, while the HI5714 utilizes only 16 comparators,
16 references and 16 latches.
A folding A/D converter operates basically like a 2 step
Features
? HI5714 Analog to Digital Converter
? External Reference
? Two Analog Inputs: One AC Coupled, One DC Coupled
? Reconstruct DAC: HI5721
? Buffered Digital Outputs
The interpolation technique further reduces the number of
necessary amplifiers by using passive elements to derive the
remaining signals. Interpolation (as seen in Figure 2) takes
advantage of the overlap between two adjacent amplifiers
and uses resistor taps to fill in the gaps (thereby replacing
three out of every four amplifiers with resistors). Signal
distortion introduced by interpolation can be ignored as only
the zero crossing is of importance.
subranging converter by using 2 lower resolution converters
to do a course and subranged fine conversion. The major
difference in the folding technique is that the folding
V O
0
V 01
V 02
amplifiers are used to do the fine conversion in parallel
with the course conversion, where the fine and course
conversions are done in a sequential mode for a
V IN
conventional subranging converter. The folding architecture
V 2
V 3
V 4
uses only the folding amplifiers, voltage comparators, flip-
flops and decoding circuits. Sample and hold and DAC
circuits are not required.
A folding amplifier is a number of parallel differential pairs
with interconnected outputs as shown in Figure 1. The
folding ratio is the number of differential pairs used in the
amplifier, which is 16 for the HI5714. When compared to a
traditional straight flash architecture, one folding amplifier
with a folding ratio of 16 replaces 16 input comparators.
Assuming no interpolation were to be performed, the number
of folding amplifiers necessary to implement an 8-bit
conversion (using a folding ratio of 16) would be DC at 16.
V CC
FIGURE 2. INTERPOLATED AMPLIFIER OUTPUTS
As stated earlier in this section, the HI5714 uses a folding
ratio of 16 (16 latched comparators) with an interpolation
ratio of 4 (4 folding amplifiers). These 16 latched
comparators in turn are decoded into 32 ROM enables to
provide the 5 LSBs of the converter. There are 8 subranging
sections of the input voltage range which perform the coarse
conversion and provide the 3 MSBs of the device.
The bias current generator is based on a simple band gap
reference which provides a typical variation of 1% over the
full temperature range.
The operation of the part is depicted in the timing diagram in
Figure 4. There is a 1 cycle clock delay from the analog input
V 1
V A
V 2
V B
V 3
sampling point to the corresponding digital output data.
V IN
FIGURE 1. FOLDING AMPLIFIER WITH A FOLDING RATIO OF 2
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright ? Intersil Americas Inc. 2002. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
相关PDF资料 |
PDF描述 |
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| HI5728EVAL1 | EVALUATION PLATFORM TQFPHI5728 |
| HI5731-EVS | EVALUATION PLATFORM SOIC HI5731 |
| HI5741-EVS | EVALUATION PLATFORM HI5741 |
| HI5760EVAL1 | EVALUATION PLATFORM SOIC HI5760 |
| HI5762EVAL2 | EVALUATION MOD FOR HI5762 AMP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| HI5721 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:10-Bit, 125 MSPS, High Speed D/A Converter |
| HI5721 WAF | 制造商:Harris Corporation 功能描述: |
| HI5721_03 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:10-Bit, 125MSPS, High Speed D/A Converter |
| HI5721BIB | 制造商:Rochester Electronics LLC 功能描述: 制造商:Harris Corporation 功能描述: 制造商:Intersil Corporation 功能描述: |
| HI5721BIBS2503 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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