Datasheet

Data Sheet AD534
Rev. D | Page 15 of 20
APPLICATIONS INFORMATION
The versatility of the AD534 allows the creative designer to implement a variety of circuits such as wattmeters, frequency doublers, and
automatic gain controls.
09675-012
AD534
+V
S
X
1
X
2
SF
Y
1
Y
2
OUT
Z
1
Z
2
–V
S
+15V
30kΩ
10kΩ
–15V
OUTPUT =
A
2
– B
2
10V
A + B
2
A – B
2
A
B
Figure 20. Difference of Squares
09675-013
AD534
+V
S
X
1
X
2
SF
Y
1
Y
2
OUT
Z
1
Z
2
–V
S
+15V
2kΩ
39kΩ
1kΩ
SET GAIN
1kΩ
–15V
–
V
S
NOTES
1. GAIN IS × 10 PER VOLT OF
E
C
, ZERO TO × 50.
2
. WIDEBAND (10Hz TO 30kHz) OUTPUT NOISE IS 3mV rms,
TYP CORRESPONDING TO A.F.S. SNR OF 70dB.
3
. NOISE REFERRED TO SIGNAL INPUT, WITH E
C
= ±5V, IS
60µV rms, TYP.
4
. BANDWIDTH IS DC TO 20kHz, –3dB, INDEPENDENT OF GAIN.
CONTROL INPUT,
E
C
, 0V TO ±5V
SIGNAL INPUT,
E
S
, ±5V PK
0.005µF
OUTPUT, ±12V PK =
E
C
E
S
0.1V
Figure 21. Voltage-Controlled Amplifier
09675-014
USING CLOSE TOLERANCE RESISTORS AND AD543L,
ACCURACY OF FIT IS WITHIN ±0.5% AT ALL POINTS.
θ IS IN RADIANS.
AD534
+V
S
X
1
X
2
SF
Y
1
Y
2
OUT
Z
1
Z
2
–V
S
+15V
18kΩ
3kΩ
10kΩ
4.7kΩ
4.3kΩ
INPUT, E
θ
0V TO +10V
–15V
WHERE θ = ×
π
2
E
θ
10V
OUTPUT = (10V) sin
θ
Figure 22. Sine Function Generator
09675-015
THE SF PIN OR A Z ATTENUATOR CAN BE USED TO PROVIDE OVERALL
SIGNAL AMPLIFICATION. OPERATION FROM A SINGLE SUPPLY POSSIBLE;
BIAS Y
2
TO V
S
/2.
AD534
+V
S
X
1
X
2
SF
Y
1
Y
2
OUT
Z
1
Z
2
–V
S
+15V
MODULATION
INPUT, ±E
M
C
ARRIER INPUT
E
C
sin ωt
–15V
E
M
10V
OUTPUT = 1 ± E
C
sin ωt
Figure 23. Linear AM Modulator
09675-016
OTHER SCALES, FROM 10% PER VOLT TO 0.1% PER VOLT
CAN BE OBTAINED BY ALTERING THE FEEDBACK RATIO.
AD534
+V
S
X
1
X
2
SF
Y
1
Y
2
OUT
Z
1
Z
2
–V
S
+15V
9kΩ
1kΩ
B INPUT,
(+
V
E
ONLY)
–15V
A – B
B
OUTPUT = (100V)
(1% PER VOLT)
A INPUT (±)
Figure 24. Percentage Computer
09675-017
AD534
+V
S
X
1
X
2
SF
Y
1
Y
2
OUT
Z
1
Z
2
–V
S
+15V
INPUT, Y ±10V FS
–15V
y
1 + y
Y
(10V)
OUTPUT, ±5V/PK =
(10V)
WHERE y =
Figure 25. Bridge Linearization Function