전자부품 데이터시트 검색엔진
  Korean  ▼
ALLDATASHEET.CO.KR

X  

AD652JP 데이터시트(PDF) 5 Page - Analog Devices

부품명 AD652JP
상세설명  Monolithic Synchronous Voltage-to-Frequency Converter
Download  16 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
제조업체  AD [Analog Devices]
홈페이지  http://www.analog.com
Logo AD - Analog Devices

AD652JP 데이터시트(HTML) 5 Page - Analog Devices

  AD652JP Datasheet HTML 1Page - Analog Devices AD652JP Datasheet HTML 2Page - Analog Devices AD652JP Datasheet HTML 3Page - Analog Devices AD652JP Datasheet HTML 4Page - Analog Devices AD652JP Datasheet HTML 5Page - Analog Devices AD652JP Datasheet HTML 6Page - Analog Devices AD652JP Datasheet HTML 7Page - Analog Devices AD652JP Datasheet HTML 8Page - Analog Devices AD652JP Datasheet HTML 9Page - Analog Devices Next Button
Zoom Inzoom in Zoom Outzoom out
 5 / 16 page
background image
AD652
REV. B
–5–
there are no problems with dielectric absorption causing the
duration of a reset pulse to be influenced by the length of time
since the last reset.
Figure 2. AD652 Block Diagram and System Waveforms
Referring to Figure 2, it can be seen that the period between
output pulses is constrained to be an exact multiple of the clock
period. Consider an input current of exactly one quarter of the
value of the reference current. In order to achieve a charge bal-
ance, the output frequency will equal the clock frequency divided
by four; one clock period for reset and three clock periods of inte-
grate. This is shown in Figure 3. If the input current is increased by
a very small amount, the output frequency should also increase
by a very small amount. Initially, however, no output change is
Figure 3. Integrator Output for lIN = 250
µA
observed for a very small increase in the input current. The out-
put frequency continues to run at one quarter of the clock,
delivering an average of 250
µA to the summing junction. Since
the input current is slightly larger than this, charge accumulates
in the integrator and the sawtooth signal starts to drift downward.
As the integrator sawtooth drifts down, the comparator thresh-
old is crossed earlier and earlier in each successive cycle, until
finally, a whole cycle is lost. When the cycle is lost, the Integrate
Phase lasts for two periods of the clock instead of the usual three
periods. Thus, among a long string of divide-by-fours an occasional
divide-by-three occurs; the average of the output frequency is
very close to one quarter of the clock, but the instantaneous fre-
quency can be very different.
Because of this, it is very difficult to observe the waveform on an
oscilloscope. During all of this time, the signal at the output of
the integrator is a sawtooth wave with an envelope which is also
a sawtooth. This is shown in Figure 4.
Figure 4. Integrator Output for IIN Slightly Greater
than 250
µA
Another way to view this is that the output is a frequency of
approximately one quarter of the clock that has been phase
modulated. A constant frequency can be thought of as accumu-
lating phase linearly with time at a rate equal to 2
πf radians per
second. Hence, the average output frequency which is slightly in
excess of a quarter of the clock will require phase accumulation
at a certain rate. However, since the SVFC is running at exactly
one quarter of the clock, it will not accumulate enough phase
(see Figure 5). When the difference between the required phase
(average frequency) and the actual phase equals 2
π, a step in
phase is taken where the deficit is made up instantaneously. The
output frequency is then a steady carrier which has been phase
modulated by a sawtooth signal (see Figure 5). The period of
the sawtooth phase modulation is the time required to accumulate
a 2
π difference in phase between the required average frequency
and one quarter of the clock frequency. The amplitude of the
sawtooth phase modulation is 2
π.
Figure 5. Phase Modulation


유사한 부품 번호 - AD652JP

제조업체부품명데이터시트상세설명
logo
Analog Devices
AD652JP AD-AD652JP Datasheet
786Kb / 28P
   Monolithic Synchronous Voltage-to-Frequency Converter
REV. C
AD652JP AD-AD652JP Datasheet
786Kb / 28P
   Monolithic Synchronous Voltage-to-Frequency Converter
REV. C
AD652JP AD-AD652JP Datasheet
786Kb / 28P
   Monolithic Synchronous Voltage-to-Frequency Converter
REV. C
AD652JP AD-AD652JP Datasheet
786Kb / 28P
   Monolithic Synchronous Voltage-to-Frequency Converter
REV. C
AD652JP AD-AD652JP Datasheet
631Kb / 29P
   Monolithic Synchronous Voltage-to-Frequency Converter
More results

유사한 설명 - AD652JP

제조업체부품명데이터시트상세설명
logo
Analog Devices
AD652JPZ-REEL AD-AD652JPZ-REEL Datasheet
786Kb / 28P
   Monolithic Synchronous Voltage-to-Frequency Converter
REV. C
AD652KPZ AD-AD652KPZ Datasheet
786Kb / 28P
   Monolithic Synchronous Voltage-to-Frequency Converter
REV. C
AD652 AD-AD652_15 Datasheet
786Kb / 28P
   Monolithic Synchronous Voltage-to-Frequency Converter
REV. C
AD652 AD-AD652_17 Datasheet
631Kb / 29P
   Monolithic Synchronous Voltage-to-Frequency Converter
AD652JPZ AD-AD652JPZ Datasheet
786Kb / 28P
   Monolithic Synchronous Voltage-to-Frequency Converter
REV. C
AD652KPZ-REEL AD-AD652KPZ-REEL Datasheet
786Kb / 28P
   Monolithic Synchronous Voltage-to-Frequency Converter
REV. C
AD651 AD-AD651 Datasheet
1Mb / 16P
   Monolithic Synchronous Voltage-to-Frequency Converter
AD652KPZ-REEL AD-AD652KPZ-REEL Datasheet
786Kb / 28P
   Monolithic Synchronous Voltage-to-Frequency Converter
REV. C
AD654 AD-AD654_17 Datasheet
410Kb / 13P
   Low Cost Monolithic Voltage-to-Frequency Converter
AD654 AD-AD654_15 Datasheet
359Kb / 12P
   Low Cost Monolithic Voltage-to-Frequency Converter
REV. C
More results


Html Pages

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


데이터시트 다운로드

Go To PDF Page


링크 URL




개인정보취급방침
ALLDATASHEET.CO.KR
ALLDATASHEET 가 귀하에 도움이 되셨나요?  [ DONATE ] 

Alldatasheet는?   |   광고문의   |   운영자에게 연락하기   |   개인정보취급방침   |   링크교환   |   제조사별 검색
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