AD534T(RevC) Просмотр технического описания (PDF) - Analog Devices
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AD534T Datasheet PDF : 21 Pages
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AD534
+15V
ADJ 8kHz
2kΩ
39kΩ
X1
+VS
+15V
3pF to 30pF
+
CONTROL INPUT,
EC 100mV TO 10V –
X2
OUT
AD534
SF
Z1
Y1
Z2
Y2
–VS
ADJ
1kHz
500Ω 2.2kΩ
(= R)
–15V
0.01
(= C)
2
82kΩ
7
3
AD211
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 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 0.01µF CAPACITOR: IF
USED AS AN OUTPUT, A VOLTAGE-FOLLOWER SHOULD BE INTERPOSED.
Figure 26. Differential Input Voltage-to-Frequency Converter
20kΩ
MATCHED TO 0.025%
10kΩ
10kΩ
INPUT
5V RMS FS
±10V PEAK
10µF
NONPOLAR
RMS + DC
MODE
AC RMS
10kΩ
X1
+VS
X2
OUT
AD534
SF
Z1
Z2
Y1
AD741K
+15V
10kΩ
5kΩ
+
10µF SOLID Ta
10kΩ
10MΩ
AD741J
Y2
–VS
20kΩ
–15V
ZERO
ADJ
+15V
OUTPUT
0V TO 5V
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 10kΩ; FOR HIGH (10MΩ) 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
Rev. C | Page 16 of 20
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