công cụ tìm kiếm bảng dữ liệu linh kiện điện tử
  Vietnamese  ▼
ALLDATASHEET.VN

X  

ML2264CCS bảng dữ liệu(PDF) 9 Page - Micro Linear Corporation

tên linh kiện ML2264CCS
Giải thích chi tiết về linh kiện  4-Channel High-Speed 8-Bit A/D Converter with T/H (S/H)
Download  17 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
nhà sản xuất  MICRO-LINEAR [Micro Linear Corporation]
Trang chủ  http://www.microlinear.com
Logo MICRO-LINEAR - Micro Linear Corporation

ML2264CCS bảng dữ liệu(HTML) 9 Page - Micro Linear Corporation

Back Button ML2264CCS Datasheet HTML 5Page - Micro Linear Corporation ML2264CCS Datasheet HTML 6Page - Micro Linear Corporation ML2264CCS Datasheet HTML 7Page - Micro Linear Corporation ML2264CCS Datasheet HTML 8Page - Micro Linear Corporation ML2264CCS Datasheet HTML 9Page - Micro Linear Corporation ML2264CCS Datasheet HTML 10Page - Micro Linear Corporation ML2264CCS Datasheet HTML 11Page - Micro Linear Corporation ML2264CCS Datasheet HTML 12Page - Micro Linear Corporation ML2264CCS Datasheet HTML 13Page - Micro Linear Corporation Next Button
Zoom Inzoom in Zoom Outzoom out
 9 / 17 page
background image
ML2264
9
1.0 FUNCTIONAL DESCRIPTION
The ML2264 uses a two stage flash technique for A/D
conversion. This technique first performs a 4 bit flash
conversion on VIN to determine the 4 MSB’s. These 4
MSB’s are then cycled through an internal DAC to
recreate the analog input. This reconstructed analog input
signal from the DAC is then subtracted from the input, and
the difference voltage is converted by a second 4 bit flash
conversion, providing the 4 LSB’s of the output data word.
1.1 MULTIPLEXER ADDRESSING
The ML2264 contains a 4-channel single ended analog
multiplexer. A particular input channel is selected by using
the address inputs A0 and A1. The relationship between
the address inputs, A0 and A1, and the analog input
selected is shown in Table 1.
Address Input
Analog Channel
A0
A1
A IN 1
0
0
A IN 2
1
0
A IN 3
0
1
A IN 4
1
1
Table 1. Multiplexer Address Decoding
The address inputs are latched into the ML2264 on the
falling edge of the RD, WR, or CS depending on the state
of pins SH/TH and mode as shown in Table 2.
Address Latching
Signal
Mode
Operation Mode
RD
Ø
GND
GND
WR
Ø
VCC
GND
CS
Ø
GND
VCC
CS
Ø
VCC
VCC
Table 2.
In the Sample & Hold mode of operation CS is used as the
address latch enable, allowing for continuous conversions
without addressing a given analog input for each
conversion.
The Track & Hold mode of operation requires an analog
input to be addressed and latched for each conversion
that the ML2264 performs.
1.2 ANALOG INPUTS
The analog input on the ML2264 behaves differently than
inputs on conventional converters. The analog input
current requirements change while the conversion is in
progress, and the amount of input current depends on
what cycle the converter is in.
Selected
The equivalent input circuit for the converter is shown in
Figure 8. When the conversion starts in the T/H mode
(WR
Ø in the WR-RD mode or RDØ in the RD mode) S1,
S4 and S6 close and S3 opens. This period is known as the
acquisition period where the MSB flash converter tracks
the input signal and the LSB flash converter samples it.
During this period, VIN is connected to the 16 MSB and
15 LSB comparators. Thus 38pF of input capacitance must
be charged up through the combined RON resistance of
the internal analog switches plus any external source
resistance, RS. In addition, there is a stray capacitance of
approximately 11pF that needs to be charged through the
external source resistance RS. This period ends in the WR-
RD mode when WR
 or by an internal timer in the RD
mode. At this point S1 and S4 open and the analog input
at VIN is no longer being sampled; thus during this time
the analog voltage on VIN does not affect converter
performance.
As shown above, the critical period for charging up the
analog input occurs when the MSB and LSB comparators
are sampling the input, known as the acquisition period.
The source of the external signal on VIN must adequately
charge up the analog voltage during the acquisition
period. To do this, the input must settle within the
required analog accuracy tolerance at least 50ns before
the end of the acquisition period so that the MSB
comparators have adequate time to make the correct
decision. If more time is needed due to finite charging or
settling time of the external source, the WR low period
can be extended in WR-RD mode. In RD mode, since the
acquisition time is fixed by internal delays, the burden is
on the external source to charge up and settle the input
adequately.
When the ML2264 operates in the S/H mode (pin 23 =
VCC) both the MSB and the LSB flash converter perform a
true sample and hold operation during the acquisition or
sampling period. This period starts after the falling edge of
INT and ends with the falling edge of WR in the WR-RD
mode or the falling edge of RD in the RD mode. The
duration of this period is user controlled and must satisfy a
minimum of tP.
During this period S1, S3, S4 and S6 close, therefore
46pF of input capacitance must be charged up in addition
to the 11pF of stray capacitance.
1.3 TRACK AND HOLD vs. SAMPLE AND HOLD
The MSB Flash Converter of the ML2264 in T/H mode has
a track and hold mechanism for sampling the input. The
input is attached to the MSB comparators directly in the
MSB compare cycle, or acquisition period. When the MSB
compare cycle ends, the state of the MSB comparators is
latched. The LSB Flash Converter always performs a S/H
operation. Thus, the analog input signal can be changing
during the MSB compare cycle, or acquisition period, and


Số phần tương tự - ML2264CCS

nhà sản xuấttên linh kiệnbảng dữ liệuGiải thích chi tiết về linh kiện
logo
Micro Linear Corporatio...
ML2261 MICRO-LINEAR-ML2261 Datasheet
1Mb / 15P
   關P Compatible High-Speed 8-Bit A/D Converter with T/H (S/H)
ML2261BCP MICRO-LINEAR-ML2261BCP Datasheet
1Mb / 15P
   關P Compatible High-Speed 8-Bit A/D Converter with T/H (S/H)
ML2261BCQ MICRO-LINEAR-ML2261BCQ Datasheet
1Mb / 15P
   關P Compatible High-Speed 8-Bit A/D Converter with T/H (S/H)
ML2261CCP MICRO-LINEAR-ML2261CCP Datasheet
1Mb / 15P
   關P Compatible High-Speed 8-Bit A/D Converter with T/H (S/H)
ML2261CCQ MICRO-LINEAR-ML2261CCQ Datasheet
1Mb / 15P
   關P Compatible High-Speed 8-Bit A/D Converter with T/H (S/H)
More results

Mô tả tương tự - ML2264CCS

nhà sản xuấttên linh kiệnbảng dữ liệuGiải thích chi tiết về linh kiện
logo
Micro Linear Corporatio...
ML2261 MICRO-LINEAR-ML2261 Datasheet
1Mb / 15P
   關P Compatible High-Speed 8-Bit A/D Converter with T/H (S/H)
logo
List of Unclassifed Man...
ADC-574Z ETC1-ADC-574Z Datasheet
632Kb / 6P
   12-BIT, uP-COMPATIVEL A/D CONVERTER WITH S/H
logo
Maxim Integrated Produc...
MAX151 MAXIM-MAX151 Datasheet
424Kb / 12P
   300kHz 10-Bit A/D Converter with Refrence and T/H
19-2897; Rev 0; 6/90
logo
Texas Instruments
TLC32071 TI1-TLC32071 Datasheet
123Kb / 15P
[Old version datasheet]   HIGH-SPEED 8-BIT A/D AND D/A CONVERTER WITH 8-CHANNEL MULTIPLEXER
logo
List of Unclassifed Man...
SPT1018 ETC1-SPT1018 Datasheet
160Kb / 11P
   8-BIT, HIGH SPEED D/A CONVERTER
SPT1019 ETC2-SPT1019 Datasheet
801Kb / 12P
   8-BIT, HIGH SPEED D/A CONVERTER
logo
API Technologies Corp
MN3014 APITECH-MN3014 Datasheet
620Kb / 2P
   High-speed 8-bit D/A Converter
logo
Integrated Circuit Syst...
MN3014 ICST-MN3014 Datasheet
616Kb / 2P
   High-speed 8-bit D/A Converter
logo
Cadeka Microcircuits LL...
SPT1019 CADEKA-SPT1019 Datasheet
4Mb / 12P
   8-BIT, HIGH SPEED D/A CONVERTER
logo
Intersil Corporation
HI-7153 INTERSIL-HI-7153 Datasheet
977Kb / 17P
   8-Channel, 10-Bit High Speed Sampling A/D Converter
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17


bảng dữ liệu tải về

Go To PDF Page


Link URL




Chính sách bảo mật
ALLDATASHEET.VN
Cho đến nay ALLDATASHEET có giúp ích cho doanh nghiệp của bạn hay không?  [ DONATE ] 

Alldatasheet là   |   Quảng cáo   |   Liên lạc với chúng tôi   |   Chính sách bảo mật   |   Trao đổi link   |   Tìm kiếm theo nhà sản xuất
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com