Os motores de busca de Datasheet de Componentes eletrônicos
  Portuguese  ▼
ALLDATASHEETPT.COM

X  

AD734BQ Folha de dados(PDF) 7 Page - Analog Devices

Nome de Peças AD734BQ
Descrição Electrónicos  10 MHz, 4-Quadrant Multiplier/Divider
Download  12 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Fabricante Electrônico  AD [Analog Devices]
Página de início  http://www.analog.com
Logo AD - Analog Devices

AD734BQ Folha de dados(HTML) 7 Page - Analog Devices

Back Button AD734BQ Datasheet HTML 3Page - Analog Devices AD734BQ Datasheet HTML 4Page - Analog Devices AD734BQ Datasheet HTML 5Page - Analog Devices AD734BQ Datasheet HTML 6Page - Analog Devices AD734BQ Datasheet HTML 7Page - Analog Devices AD734BQ Datasheet HTML 8Page - Analog Devices AD734BQ Datasheet HTML 9Page - Analog Devices AD734BQ Datasheet HTML 10Page - Analog Devices AD734BQ Datasheet HTML 11Page - Analog Devices Next Button
Zoom Inzoom in Zoom Outzoom out
 7 / 12 page
background image
AD734
–7–
REV. C
Current Output
It may occasionally be desirable to convert the output voltage to
a current. In correlation applications, for example, multiplica-
tion is followed by integration; if the output is in the form of a
current, a simple grounded capacitor can perform this function.
Figure 6 shows how this can be achieved. The op amp forces
the voltage across Z1 and Z2, and thus across the resistor RS, to
be the product XY/U. Note that the input resistance of the
Z interface is in shunt with RS, which must be calculated
accordingly.
The smallest FS current is simply
±10 V/50 kΩ, or ±200 µA,
with a tolerance of about 20%. To guarantee a 1% conversion
tolerance without adjustment, RS must be less than 2.5 k
Ω. The
maximum full scale output current should be limited to about
±10 mA (thus, R
S = 1 k
Ω). This concept can be applied to all
connection modes, with the appropriate choice of terminals.
Squaring and Frequency-Doubling
Squaring of an input signal, E, is achieved simply by connecting
the X and Y inputs in parallel; the phasing can be chosen to
produce an output of E
2/U or –E2/U as desired. The input may
have either polarity, but the basic output will either always be
positive or negative; as for multiplication, the Z2 input may be
used to add a further signal to the output.
When the input is a sine wave, a squarer behaves as a frequency-
doubler, since
(Esinwt)
2 = E2 (1 – cos2wt)/2
(8)
Equation (8) shows a dc term at the output which will vary
strongly with the amplitude of the input, E. This dc term can be
avoided using the connection shown in Figure 7, where an
RC-network is used to generate two signals whose product has
no dc term. The output is
W
= 4
E
2
sin wt
+ π
4


E
2
sin wt
− π
4


1
10 V


(9)
for w = 1/CR1, which is just
W = E2(cos2wt)/( 10 V)
(10)
which has no dc component. To restore the output to
±10 V
when E = 10 V, a feedback attenuator with an approximate ratio
of 4 is used between W and Z1; this technique can be used
wherever it is desired to achieve a higher overall gain in the
transfer function.
In fact, the values of R3 and R4 include additional compensa-
tion for the effects of the 50 k
Ω input resistance of all three
interfaces; R2 is included for a similar reason. These resistor
values should not be altered without careful calculation of the
consequences; with the values shown, the center frequency f0 is
100 kHz for C = 1 nF. The amplitude of the output is only a
weak function of frequency: the output amplitude will be 0.5%
too low at f = 0.9f0 and f = 1.1f0. The cross-connection is simply
to produce the cosine output with the sign shown in Equation
(10); however, the sign in this case will rarely be important.
R2
1.6k
R1
1.6k
C
Esin
ωt
R3
13k
R4
4.32k
E cos2
ωt
2
/10V
1
2
3
4
5
6
7
10
8
9
11
13
12
14
W
ER
VN
VP
DD
Z1
Z2
X1
X2
U1
U2
U0
Y1
Y2
AD734
NC
NC
0.1 F
0.1 F
+15V
–15V
L
L
L
Figure 7. Frequency Doubler
OPERATION AS A DIVIDER
The AD734 supports two methods for performing analog
division. The first is based on the use of a multiplier in a feed-
back loop. This is the standard mode recommended for
multipliers having a fixed scaling voltage, such as the AD534,
and will be described in this Section. The second uses the
AD734’s unique capability for externally varying the scaling
(denominator) voltage directly, and will be described in the
next section.
Feedback Divider Connections
Figure 8 shows the connections for the standard (AD534)
divider mode. Feedback from the output, W, is now taken to the
Y2 (inverting) input, which, provided that the X-input is posi-
tive, establishes a negative feedback path. Y1 should normally
be connected to the ground associated with the load circuit, but
may optionally be used to sum a further signal to the output. If
desired, the polarity of the Y-input connections can be reversed,
with W connected to Y1 and Y2 used as the optional summation
input. In this case, either the polarity of the X-input connections
must be reversed, or the X-input voltage must be negative.
Z INPUT
10V FS
X INPUT
+0.1V TO
+10V
OPTIONAL
SUMMING
INPUT
10V FS
W = 10
+Y1
(Z2 – Z1)
(X1 – X2)
1
2
3
4
5
6
7
10
8
9
11
13
12
14
W
ER
VN
VP
DD
Z1
Z2
X1
X2
U1
U2
U0
Y1
Y2
AD734
NC
NC
0.1 F
0.1 F
+15V
–15V
L
L
Y1
L
Figure 8. Standard (AD534) Divider Connection
The numerator input, which is differential and can have either
polarity, is applied to pins Z1 and Z2. As with all dividers based
on feedback, the bandwidth is directly proportional to the
denominator, being 10 MHz for X = 10 V and reducing to
100 kHz for X = 100 mV. This reduction in bandwidth, and the
increase in output noise (which is inversely proportional to the
denominator voltage) preclude operation much below a denomi-
nator of 100 mV. Division using direct control of the denominator
(Figure 10) does not have these shortcomings.


Nº de peça semelhante - AD734BQ

Fabricante ElectrônicoNome de PeçasFolha de dadosDescrição Electrónicos
logo
Analog Devices
AD734BQ AD-AD734BQ Datasheet
451Kb / 20P
   10 MHz, Four-Quadrant Multiplier/Divider
REV. E
More results

Descrição semelhante - AD734BQ

Fabricante ElectrônicoNome de PeçasFolha de dadosDescrição Electrónicos
logo
Analog Devices
AD734 AD-AD734_15 Datasheet
451Kb / 20P
   10 MHz, Four-Quadrant Multiplier/Divider
Rev. E
AD734ANZ AD-AD734ANZ Datasheet
451Kb / 20P
   10 MHz, Four-Quadrant Multiplier/Divider
Rev. E
AD734SQ AD-AD734SQ Datasheet
451Kb / 20P
   10 MHz, Four-Quadrant Multiplier/Divider
REV. E
AD835 AD-AD835_15 Datasheet
237Kb / 16P
   250 MHz, Voltage Output, 4-Quadrant Multiplier
REV. D
AD835ARZ AD-AD835ARZ Datasheet
237Kb / 16P
   250 MHz, Voltage Output, 4-Quadrant Multiplier
REV. D
AD835 AD-AD835 Datasheet
200Kb / 8P
   250 MHz, Voltage Output 4-Quadrant Multiplier
REV. A
AD835ANZ AD-AD835ANZ Datasheet
237Kb / 16P
   250 MHz, Voltage Output, 4-Quadrant Multiplier
REV. D
AD835ANZ AD-AD835ANZ Datasheet
237Kb / 16P
   250 MHz, Voltage Output,4-Quadrant Multiplier
Rev. D
AD834 AD-AD834 Datasheet
258Kb / 8P
   500 MHz Four-Quadrant Multiplier
REV. C
AD834 AD-AD834_12 Datasheet
351Kb / 20P
   500 MHz Four-Quadrant Multiplier
Rev. F
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12


Folha de dados Download

Go To PDF Page


Ligação URL




Privacy Policy
ALLDATASHEETPT.COM
ALLDATASHEET é útil para você?  [ DONATE ] 

Sobre Alldatasheet   |   Publicidade   |   Contato conosco   |   Privacy Policy   |   roca de Link   |   Lista de Fabricantes
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