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AD650 반도체 회로 부품 판매점

Voltage-to-Frequency and Frequency-to-Voltage Converter



Analog Devices 로고
Analog Devices
AD650 데이터시트, 핀배열, 회로
a
FEATURES
V/F Conversion to 1 MHz
Reliable Monolithic Construction
Very Low Nonlinearity
0.002% typ at 10 kHz
0.005% typ at 100 kHz
0.07% typ at 1 MHz
Input Offset Trimmable to Zero
CMOS or TTL Compatible
Unipolar, Bipolar, or Differential V/F
V/F or F/V Conversion
Available in Surface Mount
MIL-STD-883 Compliant Versions Available
Voltage-to-Frequency and
Frequency-to-Voltage Converter
AD650
PIN CONFIGURATION
PRODUCT DESCRIPTION
The AD650 V/F/V (voltage-to-frequency or frequency-to-voltage
converter) provides a combination of high frequency operation
and low nonlinearity previously unavailable in monolithic form.
The inherent monotonicity of the V/F transfer function makes
the AD650 useful as a high-resolution analog-to-digital converter.
A flexible input configuration allows a wide variety of input volt-
age and current formats to be used, and an open-collector output
with separate digital ground allows simple interfacing to either
standard logic families or opto-couplers.
The linearity error of the AD650 is typically 20 ppm (0.002%
of full scale) and 50 ppm (0.005%) maximum at 10 kHz full
scale. This corresponds to approximately 14-bit linearity in an
analog-to-digital converter circuit. Higher full-scale frequencies
or longer count intervals can be used for higher resolution con-
versions. The AD650 has a useful dynamic range of six decades
allowing extremely high resolution measurements. Even at 1 MHz
full scale, linearity is guaranteed less than 1000 ppm (0.1%) on
the AD650KN, BD, and SD grades.
In addition to analog-to-digital conversion, the AD650 can be used
in isolated analog signal transmission applications, phased locked-
loop circuits, and precision stepper motor speed controllers. In
the F/V mode, the AD650 can be used in precision tachometer
and FM demodulator circuits.
The input signal range and full-scale output frequency are user-
programmable with two external capacitors and one resistor.
Input offset voltage can be trimmed to zero with an external
potentiometer.
REV. C
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
The AD650JN and AD650KN are offered in a plastic 14-lead
DIP package. The AD650JP is available in a 20-lead plastic
leaded chip carrier (PLCC). Both plastic packaged versions of the
AD650 are specified for the commercial (0°C to +70°C) tempera-
ture range. For industrial temperature range (–25°C to +85°C)
applications, the AD650AD and AD650BD are offered in a
ceramic package. The AD650SD is specified for the full –55°C
to +125°C extended temperature range.
PRODUCT HIGHLIGHTS
1. In addition to very high linearity, the AD650 can operate at
full-scale output frequency up to 1 MHz. The combination of
these two features makes the AD650 an inexpensive solution
for applications requiring high resolution monotonic A/D
conversion.
2. The AD650 has a very versatile architecture that can be con-
figured to accommodate bipolar, unipolar, or differential
input voltages, or unipolar input currents.
3. TTL or CMOS compatibility is achieved using an open
collector frequency output. The pull-up resistor can be
connected to voltages up to +30 V, or +15 V or +5 V for
conventional CMOS or TTL logic levels.
4. The same components used for V/F conversion can also be
used for F/V conversion by adding a simple logic biasing net-
work and reconfiguring the AD650.
5. The AD650 provides separate analog and digital grounds.
This feature allows prevention of ground loops in real-world
applications.
6. The AD650 is available in versions compliant with MIL-
STD-883. Refer to the Analog Devices Military Products
Databook or current AD650/883B data sheet for detailed
specifications.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2000


AD650 데이터시트, 핀배열, 회로
AD650–SPECIFICATIONS (@ +25؇C, with VS = ؎15 V, unless otherwise noted)
Model
AD650J/AD650A
Min Typ Max
AD650K/AD650B
Min Typ Max
AD650S
Min Typ
Max
Units
DYNAMIC PERFORMANCE
Full-Scale Frequency Range
Nonlinearity1 fMAX = 10 kHz
Nonlinearity1 fMAX = 100 kHz
Nonlinearity1 fMAX = 500 kHz
Nonlinearity1 fMAX = 1 MHz
Full-Scale Calibration Error2, 100 kHz
Full-Scale Calibration Error2, 1 MHz
vs. Supply3
vs. Temperaturc
A, B, and S Grades
at 10 kHz
at 100 kHz
J and K Grades
at 10 kHz
at 100 kHz
BIPOLAR OFFSET CURRENT
Activated by 1.24 kBetween Pins 4 and 5
DYNAMIC RESPONSE
Maximum Settling Time for Full Scale
Step Input
Overload Recovery Time
Step Input
–0.015
0.002
0.005
0.02
0.1
±5
± 10
1
0.005
0.02
0.05
+0.015
–0.015
0.002
0.005
0.02
0.05
±5
± 10
1
0.005
0.02
0.05
0.1
+0.015
–0.015
0.002
0.005
0.02
0.05
±5
± 10
1
0.005
0.02
0.05
0.1
+0.015
MHz
%
%
%
%
%
%
% of FSR/V
± 75
± 150
± 75
± 150
± 75
± 150
± 75
± 150
0.45 0.5
0.55 0.45 0.5
0.55 0.45 0.5
± 75
± 150
0.55
ppm/°C
ppm/°C
ppm/°C
ppm/°C
mA
1 Pulse of New Frequency Plus 1 µs 1 Pulse of New Frequency Plus 1 µs 1 Pulse of New Frequency Plus 1 µs
1 Pulse of New Frequency Plus 1 µs 1 Pulse of New Frequency Plus 1 µs 1 Pulse of New Frequency Plus 1 µs
ANALOLG INPUT AMPLIFIER (V/F Conversion)
Current Input Range (Figure 1)
Voltage Input Range (Figure 5)
Differential Impedance
Common-Mode Impedance
Input Bias Current
Noninverting Input
Inverting Input
Input Offset Voltage
(Trimmable to Zero)
vs. Temperature (TMIN to TMAX)
Safe Input Voltage
COMPARATOR (F/V Conversion)
Logic “0” Level
Logic “1” Level
Pulse Width Range4
Input Impedance
0
–10
2 Mʈ10 pF
1000 Mʈ10 pF
40
±8
± 30
± VS
–VS
0
0.1
250
OPEN COLLECTOR OUTPUT (V/F Conversion)
Output Voltage in Logic “0”
ISINK 8 mA, TMIN to TMAX
Output Leakage Current in Logic “1”
Voltage Range5
0
AMPLIFIER OUTPUT (F/V Conversion)
Voltage Range (1500 min Load Resistance)
Source Current (750 max Load Resistance)
Capacitive Load (Without Oscillation)
0
10
+0.6
0
0
–10
2 Mʈ10 pF
1000 Mʈ10 pF
+0.6
0
0 +0.6
–10 0
2 Mʈ10 pF
1000 Mʈ10 pF
mA
V
100 40 100 40 100 nA
؎20 ± 8 ؎20 ± 8 ؎20 nA
؎4 ؎4
؎4 mV
± 30 ± 30 µ V/°C
± VS ± VS C
–1 –VS
–1 –VS
+VS 0
+VS 0
(0.3 × tOS) 0.1
(0.3 × tOS) 0.1
250 250
+1
+VS
(0.3 × tOS)
V
V
µs
k
0.4
100
+36 0
+10 0
10
100
0.4
100
+36 0
+10 0
10
100
0.4 V
100 nA
+36 V
+10 V
mA
100 pF
POWER SUPPLY
Voltage, Rated Performance
Quiescent Current
± 9 ؎18 ± 9 ؎18 ± 9
88
؎18 V
8 mA
TEMPERATURE RANGE
Rated Performance – N Package
Rated Performance – D Package
0
–25
+70 0
+85 –25
+70
+85 –55
+125
°C
°C
NOTES
1Nonlinearity is defined as deviation from a straight line from zero to full scale, expressed as a fraction of full scale.
2Full-scale calibration error adjustable to zero.
3Measured at full-scale output frequency of 100 kHz.
4Refer to F/V conversion section of the text.
5Referred to digital ground.
Specifications subject to change without notice.
Specifications shown in boldface are tested on all production units at final electrical test. Results from those test are used to calculate outgoing quality levels. All min and max
specifications are guaranteed, although only those shown in boldface are tested on all production units.
–2– REV. C




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