AD534S Просмотр технического описания (PDF) - Analog Devices
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AD534S Datasheet PDF : 12 Pages
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+15V
ADJ 8kHz
39k⍀
2k⍀
X1
+VS +15V
3-30p
CONTROL +
INPUT, EC
100mV TO 10V –
X2
OUT
AD534
SF
Z1
Z2
Y1
Y2
–VS
ADJ
1kHz
500⍀ 2.2k⍀
(= R)
–15V
0.01
(= C)
82k⍀
2
7
OUTPUT
3
؎15V APPROX.
AD211
PINS 5, 6, 8 TO +15V
PINS 1, 4 TO –15V
f = EC 1
40 CR
= 1kHz PER VOLT
WITH VALUES SHOWN
CALIBRATION PROCEDURE:
WITH EC = 1.0V, ADJUST POT 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 FOR ANY 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 14. Differential-Input Voltage-to-Frequency Converter
20k⍀
MATCHED TO 0.025%
10k⍀
10k⍀
INPUT
5V RMS FS
؎10V PEAK
10F
NONPOLAR
RMS + DC
MODE
AC RMS
10k⍀
AD741K
X1
+VS +15V
5k⍀
X2
OUT
AD534
SF
Z1
Z2
Y1
10k⍀
+
10F SOLID Ta
10k⍀
–
+
AD741J
10M⍀
Y2
–VS
20k⍀
–15V
ZERO
ADJ
+15V
OUTPUT
0 TO +5V
CALIBRATION PROCEDURE:
WITH 'MODE' SWITCH IN 'RMS + DC' POSITION, APPLY AN INPUT OF +1.00VDC.
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 TRIANGULAR-WAVE).
PROVIDED THAT THE PEAK INPUT IS NOT EXCEEDED, CREST-FACTORS UP
TO AT LEAST TEN 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 15. Wideband, High-Crest Factor, RMS-to-DC Converter
AD534
REV. B
–9–
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