전자부품 데이터시트 검색엔진
  Korean  ▼
ALLDATASHEET.CO.KR

X  

AD538BD 데이터시트(PDF) 7 Page - Analog Devices

부품명 AD538BD
상세설명  Real-Time Analog Computational Unit ACU
Download  11 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
제조업체  AD [Analog Devices]
홈페이지  http://www.analog.com
Logo AD - Analog Devices

AD538BD 데이터시트(HTML) 7 Page - Analog Devices

Back Button AD538BD Datasheet HTML 3Page - Analog Devices AD538BD Datasheet HTML 4Page - Analog Devices AD538BD Datasheet HTML 5Page - Analog Devices AD538BD Datasheet HTML 6Page - Analog Devices AD538BD Datasheet HTML 7Page - Analog Devices AD538BD Datasheet HTML 8Page - Analog Devices AD538BD Datasheet HTML 9Page - Analog Devices AD538BD Datasheet HTML 10Page - Analog Devices AD538BD Datasheet HTML 11Page - Analog Devices  
Zoom Inzoom in Zoom Outzoom out
 7 / 11 page
background image
AD538
–7–
REV. C
STABILITY PRECAUTIONS
At higher frequencies, the multistaged signal path of the AD538,
as illustrated in Figure 10, can result in large phase shifts. If a
condition of high incremental gain exists along that path (e.g.,
VO = VY
× V
Z /VX = 10 V
× 10 mV/10 mV = 10 V so that
∆V
O /
∆V
X = 1000), then small amounts of capacitive feedback
from VO to the current inputs IZ or IX can result in instability.
Appropriate care should be exercised in board layout to pre-
vent capacitive feedback mechanisms under these conditions.
LOGe
IY
VY
Ln Y
LOGe
IZ
VZ
Ln Z
LOGe
IX
VX
Ln X
0.2 M 5
BUFFER
+
++
Ln Z – Ln X
M(Ln Z – Ln X)
M(Ln Z – Ln X) +Ln Y
VO = VY
VZ
VX
M
ANTILOGe
Figure 10. Model Circuit
USING THE VOLTAGE REFERENCES
A stable bandgap voltage reference for scaling is included in the
AD538. It is laser-trimmed to provide a selectable voltage out-
put of +10 V buffered (Pin 4), +2 V unbuffered (Pin 5) or any
voltages between +2 V and +10.2 V buffered as shown in Figure
11. The output impedance at Pin 5 is approximately 5 k
Ω. Note
that any loading of this pin will produce an error in the +10 V
reference voltage. External loads on the +2 V output should be
greater than 500 k
Ω to maintain errors less than 1%.
25k
25k
LOG
RATIO
100
25k
25k
ANTILOG
LOG
OUTPUT
100
AD538
INTERNAL
VOLTAGE
REFERENCE
I
VO
IZ
VZ
B
REF OUT
–VS
+VS
+2V
IY
A
D
IX
VX
C
PWR
GND
SIGNAL
GND
VY
118
17
16
15
14
13
12
11
10
2
3
4
5
6
7
8
9
50k
11.5k
+2V TO +10.2V
BUFFERED
Figure 11. +2 V to +10.2 V Adjustable Reference
In situations not requiring both reference levels, the +2 V output
can be converted to a buffered output by tying Pins 4 and 5
together. If both references are required simultaneously, the
+10 V output should be used directly and the +2 V output
should be externally buffered.
ONE-QUADRANT MULTIPLICATION/DIVISION
Figure 12 shows how the AD538 may be easily configured as a
precision one-quadrant multiplier/divider. The transfer function
VOUT = VY (VZ /VX) allows “three” independent input variables,
a calculation not available with a conventional multiplier. In
addition, the 1000:1 (i.e., 10 mV to 10 V) input dynamic range
of the AD538 greatly exceeds that of analog multipliers comput-
ing one-quadrant multiplication and division.
25k
25k
LOG
RATIO
100
25k
25k
ANTILOG
LOG
OUTPUT
100
AD538
INTERNAL
VOLTAGE
REFERENCE
I
VO
IZ
VZ
B
+10V
+2V
IY
A
D
IX
VX
C
PWR
GND
SIGNAL
GND
VY
1
18
17
16
15
14
13
12
11
10
2
3
4
5
6
7
8
9
VZ
INPUT
+15V
–15V
OUTPUT
VX
INPUT
VY
INPUT
IN4148
VOUT = VY (
)
VZ
VX
Figure 12. One-Quadrant Combination Multiplier/Divider
By simply connecting the input VX (Pin 15) to the +10 V refer-
ence (Pin 4), and tying the log-ratio output at B to the antilog
input at C, the AD538 can be configured as a one-quadrant
analog multiplier with 10-volt scaling. If 2-volt scaling is desired,
VX can be tied to the +2 V reference.
When the input VX is tied to the +10 V reference terminal, the
multiplier transfer function becomes:
V
O = VY
V
Z
10 V


As a multiplier, this circuit provides a typical bandwidth of
400 kHz with values of VX, VY or VZ varying over a 100:1 range
(i.e., 100 mV to 10 V). The maximum error with a 100 mV to
10 V range for the two input variables will typically be +0.5% of
reading. Using the optional Z offset trim scheme, as shown in
Figure 13, this error can be reduced to +0.25% of reading.
By using the +10 V reference as the VY input, the circuit of
Figure 12 is configured as a one-quadrant divider with a fixed
scale factor. As with the one-quadrant multiplier, the inputs
accept only single (positive) polarity signals. The output of the
one-quadrant divider with a +10 V scale factor is:
V
O = 10V
V
Z
V
X


The typical bandwidth of this circuit is 370 kHz with 1 V to
10 V denominator input levels. At lower amplitudes, the band-
width gradually decreases to approximately 200 kHz at the
2 mV input level.


유사한 부품 번호 - AD538BD

제조업체부품명데이터시트상세설명
logo
Analog Devices
AD538BD AD-AD538BD Datasheet
511Kb / 17P
   Real-Time Analog Computational Unit (ACU)
Rev. E
AD538BDZ AD-AD538BDZ Datasheet
511Kb / 17P
   Real-Time Analog Computational Unit (ACU)
Rev. E
More results

유사한 설명 - AD538BD

제조업체부품명데이터시트상세설명
logo
Analog Devices
AD538BDZ AD-AD538BDZ Datasheet
511Kb / 17P
   Real-Time Analog Computational Unit (ACU)
Rev. E
AD538 AD-AD538_15 Datasheet
547Kb / 17P
   Real-Time Analog Computational Unit
Rev. E
logo
Dallas Semiconductor
DS12887 DALLAS-DS12887 Datasheet
584Kb / 19P
   Real Time Clock
DS12B887 DALLAS-DS12B887 Datasheet
102Kb / 16P
   Real Time Clock
logo
List of Unclassifed Man...
VT82885 ETC-VT82885 Datasheet
72Kb / 16P
   Real Time Clock
logo
OKI electronic componet...
MSM6782-01 OKI-MSM6782-01 Datasheet
88Kb / 17P
   REAL TIME CLOCK
logo
Golledge Electronics Lt...
RV4162C7 GOLLEDGE-RV4162C7 Datasheet
135Kb / 1P
   Real Time Clock
RV8564C2 GOLLEDGE-RV8564C2_08 Datasheet
55Kb / 1P
   Real Time Clock
logo
Epson ToYoCom
RTC-8593SA EPSONTOYOCOM-RTC-8593SA Datasheet
377Kb / 2P
   Real time clock
RTC-64613 EPSONTOYOCOM-RTC-64613 Datasheet
440Kb / 2P
   Real time clock
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11


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