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AD534
Data Sheet
Rev. D | Page 16 of 20
09
675-
018
AD534
+VS
X1
X2
SF
Y1
Y2
OUT
Z1
Z2
–VS
+15V
500
39k
2k
82k
2.2k
–15V
CONTROL INPUT,
EC 100mV TO 10V
+
–
(= R)
ADJ
1kHz
0.01
(= C)
ADJ 8kHz
3pF to 30pF
2
3
7
AD211
+15V
OUTPUT
±15V APPROX.
PINS 5, 6, 8 TO +15V
PINS 1, 4 TO –15V
f =
×
EC
40
1
CR = 1kHz PER VOLT
WITH VALUES SHOWN
CALIBRATION PROCEDURE:
WITH EC = 1.0V, ADJUST POTENTIOMETER TO SET f = 1.000kHz WITH
EC = 8.0V, ADJUST TRIMMER CAPACITOR TO SET f = 8.000kHz. LINEARITY
WILL TYPICALLY BE WITHIN ±0.1% OF FS FORANY OTHER INPUT.
DUE TO DELAYS IN THE COMPARATOR, THIS TECHNIQUE IS NOT SUITABLE
FOR MAXIMUM FREQUENCIES ABOVE 10kHz. FOR FREQUENCIES ABOVE
10kHz THE AD537 VOLTAGE-TO-FREQUENCY CONVERTER IS RECOMMENDED.
A TRIANGLE-WAVE OF ±5V PK APPEARS ACROSS THE 0.01F CAPACITOR: IF
USED AS AN OUTPUT, A VOLTAGE-FOLLOWER SHOULD BE INTERPOSED.
Figure 26. Differential Input Voltage-to-Frequency Converter
0
967
5-
01
9
AD534
AD741J
+VS
X1
X2
SF
Y1
Y2
OUT
Z1
Z2
–VS
+15V
10k
20k
10k
ZERO
ADJ
10M
–15V
10F
NONPOLAR
10F SOLID Ta
20k
AD741K
5k
+
RMS + DC
MODE
AC RMS
INPUT
5V RMS FS
±10V PEAK
OUTPUT
0V TO 5V
MATCHED TO 0.025%
CALIBRATION PROCEDURE:
WITH MODE SWITCH IN ‘RMS + DC’ POSITION, APPLY AN INPUT OF +1.00V DC.
ADJUST ZERO UNTIL OUTPUT READS SAME AS INPUT. CHECK FOR INPUTS
OF ±10V; OUTPUT SHOULD BE WITHIN ±0.05% (5mV).
ACCURACY IS MAINTAINED FROM 60Hz TO 100kHz, AND IS TYPICALLY HIGH
BY 0.5% AT 1MHz FOR VIN = 4V RMS (SINE, SQUARE, OR TRIANGLULAR-WAVE).
PROVIDED THAT THE PEAK INPUT IS NOT EXCEEDED, CREST FACTORS UP
TO AT LEAST 10 HAVE NO APPRECIABLE EFFECT ON ACCURACY.
INPUT IMPEDANCE IS ABOUT 10k; FOR HIGH (10M) IMPEDANCE, REMOVE
MODE SWITCH AND INPUT COUPLING COMPONENTS.
FOR GUARANTEED SPECIFICATIONS THE AD536A AND AD636 ARE OFFERED
AS A SINGLE PACKAGE RMS-TO-DC CONVERTER.
Figure 27. Wideband, High-Crest Factor, RMS-to-DC Converter