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參數資料
| 型號： | AD824AR-14-3V |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運動控制電子 |
| 英文描述： | VARISTOR 14V RMS 14MM RADIAL |
| 中文描述： | QUAD OP-AMP, 4000 uV OFFSET-MAX, 2 MHz BAND WIDTH, PDSO14 |
| 封裝： | PLASTIC, SOIC-14 |
| 文件頁數： | 12/16頁 |
| 文件大小： | 551K |
| 代理商： | AD824AR-14-3V |
AD824
–12–
REV. A
APPLICATIONS
Single Supply Voltage-to-Frequency Converter
The circuit shown in Figure 31 uses the AD824 to drive a low
power timer, which produces a stable pulse of width t
1
. The
positive going output pulse is integrated by R1-C1 and used as
one input to the AD824, which is connected as a differential
integrator. The other input (nonloading) is the unknown volt-
age, V
IN
. The AD824 output drives the timer trigger input, clos-
ing the overall feedback loop.
2
6
5
3
4
+10V
0.1
μ
F
C5
R
SCALE
**
10k
R1
499k, 1%
R2
499k, 1%
0V TO 2.5V
FULL SCALE
C1
0.01
μ
F, 2%
C2
0.01
μ
F, 2%
U4
REF02
V
REF
= 5V
U1
4
3
U3B
2
1
U3A
C6
390pF
5%
(NPO)
C3
0.1
μ
F
THR
TR
DIS
R
V+
OUT
CV
GND
4
8
6
2
7
1
3
5
C4
0.01
μ
F
R3
*
116k
U2
CMOS 555
OUT2
OUT1
NOTES:
f
OUT
= /(VREF*t
1
), t
1
= 1.1*R3*C6
= 25kHz f
S
AS SHOWN.
*
= 1% METAL FILM, <50ppm/
°
C TC
**
= 10%, 20T FILM, <100ppm/
°
C TC
t
1
= 33
μ
s FOR f
OUT
= 20kHz @
= 2.0V
CMOS
74HCO4
1/4
AD824B
V
IN
V
IN
Figure 31. Single Supply Voltage-to-Frequency Converter
Typical AD824 bias currents of 2 pA allow megaohm-range
source impedances with negligible dc errors. Linearity errors on
the order of 0.01% full scale can be achieved with this circuit.
This performance is obtained with a 5 volt single supply, which
delivers less than 3 mA to the entire circuit.
Single Supply Programmable Gain Instrumentation Amplifier
The AD824 can be configured as a single supply instrumenta-
tion amplifier that is able to operate from single supplies down
to 3 V or dual supplies up to
±
15 V. AD824 FET inputs’ 2 pA
bias currents minimize offset errors caused by high unbalanced
source impedances.
An array of precision thin-film resistors sets the in amp gain to
be either 10 or 100. These resistors are laser-trimmed to ratio
match to 0.01% and have a maximum differential TC of
5 ppm/
°
C.
Table I. AD824 In Amp Performance
Parameters
V
S
= 3 V, 0 V
V
S
=
6
5 V
CMRR
Common-Mode
Voltage Range
3 dB BW, G = 10
74 dB
80 dB
–0.2 V to +2 V
180 kHz
18 kHz
–5.2 V to +4 V
180 kHz
18 kHz
G = 100
t
SETTLING
2 V Step (V
S
= 0 V, 3 V)
5 V (V
S
=
±
5 V)
Noise @ f = 1 kHz, G = 10
2
μ
s
5
μ
s
270 nV/
√
Hz
2.2
μ
V/
√
Hz
270 nV/
√
Hz
2.2
μ
V/
√
Hz
G = 100
10
0%
100
90
1V
5μs
Figure 32a. Pulse Response of In Amp to a 500 mV p-p
Input Signal; V
S
= +5 V, 0 V; Gain = 10
(G =10) V
OUT
= (V
IN1
– V
IN2
) (1+R4 + R5
REF
(G =100) V
OUT
= (V
IN1
– V
IN2
) (1+ RR4
REF
FOR R1 = R6, R2 = R5 AND R3 = R4
R1
R2
R3
R4
R5
R6
90k
9k
1k
1k
9k
90k
V
OUT
V
IN1
0.1
μ
F
8
1/4
AD824
1/4
AD824
V
IN2
R
P
1k
1
2
3
6
5
11
7
OHMTEK
PART # 1043
V
REF
G =10
G =100
R
P
1k
G =100
G =10
+V
S
Figure 32b. A Single Supply Programmable
Instrumentation Amplifier
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