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Analog Devices Semiconductor Electronic Components Datasheet

AD652 Datasheet

Monolithic Synchronous Voltage-to-Frequency Converter

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AD652 pdf
a
FEATURES
Full-Scale Frequency (Up to 2 MHz) Set by External
System Clock
Extremely Low Linearity Error (0.005% max at 1 MHz
FS, 0.02% max at 2 MHz FS)
No Critical External Components Required
Accurate 5 V Reference Voltage
Low Drift (25 ppm/؇C max)
Dual or Single Supply Operation
Voltage or Current Input
MIL-STD-883 Compliant Versions Available
Monolithic Synchronous
Voltage-to-Frequency Converter
AD652
FUNCTIONAL BLOCK DIAGRAM
PRODUCT DESCRIPTION
The AD652 Synchronous Voltage-to-Frequency Converter
(SVFC) is a powerful building block for precision analog-to-
digital conversion, offering typical nonlinearity of 0.002%
(0.005% maximum) at a 100 kHz output frequency. The inher-
ent monotonicity of the transfer function and wide range of
clock frequencies allows the conversion time and resolution to
be optimized for specific applications.
The AD652 uses a variation of the popular charge-balancing
technique to perform the conversion function. The AD652 uses
an external clock to define the full-scale output frequency,
rather than relying on the stability of an external capacitor. The
result is a more stable, more linear transfer function, with sig-
nificant application benefits in both single- and multichannel
systems.
Gain drift is minimized using a precision low drift reference and
low TC on-chip thin-film scaling resistors. Furthermore, the ini-
tial gain error is reduced to less than 0.5% by the use of
laser-wafer-trimming.
The analog and digital sections of the AD652 have been de-
signed to allow operation from a single-ended power source,
simplifying its use with isolated power supplies.
The AD652 is available in five performance grades. The 20-lead
PLCC packaged JP and KP grades are specified for operation
over the 0°C to +70°C commercial temperature range. The
16-lead cerdip-packaged AQ and BQ grades are specified for
operation over the –40°C to +85°C industrial temperature
range, and the AD652SQ is available for operation over the full
–55°C to +125°C extended temperature range.
PRODUCT HIGHLIGHTS
1. The use of an external clock to set the full-scale frequency
allows the AD652 to achieve linearity and stability far supe-
rior to other monolithic VFCs. By using the same clock to
drive the AD652 and (through a suitable divider) also set the
counting period, conversion accuracy is maintained indepen-
dent of variations in clock frequency.
2. The AD652 Synchronous VFC requires only a single external
component (a noncritical integrator capacitor) for operation.
3. The AD652 includes a buffered, accurate 5 V reference
which is available to the user.
4. The clock input of the AD652 is TTL and CMOS compat-
ible and can also be driven by sources referred to the negative
power supply. The flexible open-collector output stage pro-
vides sufficient current sinking capability for TTL and CMOS
logic, as well as for optical couplers and pulse transformers.
A capacitor-programmable one-shot is provided for selection
of optimum output pulse width for power reduction.
5. The AD652 can also be configured for use as a synchronous
F/V converter for isolated analog signal transmission.
6. The AD652 is available in versions compliant with MIL-
STD-883. Refer to the Analog Devices Military Products
Databook or current AD652/883B data sheet for detailed
specifications.
REV. B
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.
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


Analog Devices Semiconductor Electronic Components Datasheet

AD652 Datasheet

Monolithic Synchronous Voltage-to-Frequency Converter

No Preview Available !

AD652 pdf
AD652–SPECIFICATIONS (typical @ TA = +25؇C, VS = ؎15 V, unless otherwise noted)
Parameter
AD652JP/AQ/SQ
Min Typ Max
AD652KP/BQ
Min Typ Max
Units
VOLTAGE-TO-FREQUENCY MODE
Gain Error
fCLOCK = 200 kHz
fCLOCK = 1 MHz
fCLOCK = 4 MHz
Gain Temperature Coefficient
fCLOCK = 200 kHz
fCLOCK = 1 MHz
fCLOCK = 4 MHz
Power Supply Rejection Ratio
Linearity Error
fCLOCK = 200 kHz
fCLOCK = 1 MHz
fCLOCK = 2 MHz
fCLOCK = 4 MHz
Offset (Transfer Function, RTI)
Offset Temperature Coefficient
Response Time
± 0.5 ± 1
± 0.5 ؎1
± 0.5 ؎1.5
± 0.25
± 0.25
± 0.25
± 0.5
؎0.5
؎0.75
%
%
%
± 25
± 25
± 10
± 25
0.001
± 50
؎50
؎50
؎75
0.01
± 15
± 15
± 10
± 15
0.001
± 25
؎25
؎30
؎50
0.01
ppm/°C
ppm/°C
ppm/°C1
ppm/°C
%/V
± 0.002 ± 0.02
± 0.002 ± 0.005
± 0.002 ؎0.02
± 0.002 ؎0.005
± 0.01 ± 0.02
± 0.002 ± 0.005
± 0.02 ؎0.05
± 0.01 ؎0.02
± 1 ؎3
± 1 ؎2
± 10 ؎50
± 10 ؎25
One Period of New Output Frequency Plus One Clock Period.
%
%
%
%
mV
µV/°C
FREQUENCY-TO-VOLTAGE MODE
Gain Error
fIN = 100 kHz FS
Linearity Error
fIN = 100 kHz FS
INPUT RESISTORS
Cerdip (Figure 1a)(0 to +10 V FS Range)
PLCC (Figure lb)
Pin 8 to Pin 7
Pin 7 to Pin 5 (0 V to +5 V FS Range)
Pin 8 to Pin 5 (0 V to +10 V FS Range)
Pin 9 to Pin 5 (0 V to +8 V FS Range)
Pin 10 to Pin 5 (Auxiliary Input)
Temperature Coefficient (All)
19.8
9.9
9.9
19.8
15.8
19.8
± 0.5
± 0.002
±1
± 0.02
20 20.2
10 10.1
10 10.1
20 20.2
16 16.2
20 20.2
± 50 ؎100
± 0.25 ± 0.5
± 0.002 ± 0.01
%
%
19.8 20 20.2 k
9.9 10 10.1 k
9.9 10 10.1 k
19.8 20 20.2 k
15.8 16 16.2 k
19.8 20 20.2 k
± 50 ؎100 ppm/°C
INTEGRATOR OP AMP
Input Bias Current
Inverting Input (Pin 5)
Noninverting Input (Pin 6)
Input Offset Current
Input Offset Current Drift
Input Offset Voltage
Input Offset Voltage Drift
Open Loop Gain
Common-Mode Input Range
CMRR
Bandwidth
Output Voltage Range
(Referred to Pin 6, R1 > = 5k)
–VS + 5
80
14
–1
±5
20
20
1
±1
± 10
86
95
؎20
50
70
3
؎3
± 25
+VS – 5
(+VS – 4)
–VS + 5
80
14
–1
±5
20
20
1
±1
± 10
86
95
؎20 nA
50 nA
70 nA
2 nA/°C
؎2 mV
± 15 µV/°C
dB
+VS – 5 V
dB
MHz
(+VS – 4) V
COMPARATOR
Input Bias Current
Common-Mode Voltage
CLOCK INPUT
Maximum Frequency
Threshold Voltage (Referred to Pin 12)
TMIN to TMAX
Input Current
(–VS<VCLK< +VS)
Voltage Range
Rise Time
–VS + 4
0.5
45
1.2
0.8
5
–VS
5
+ VS – 4
2.0
20
+VS
2
–VS + 4
0.5
45
1.2
0.8
5
–VS
5 µA
+VS – 4 V
MHz
V
2.0 V
20 µA
+VS V
2 µs
–2– REV. B


Part Number AD652
Description Monolithic Synchronous Voltage-to-Frequency Converter
Maker Analog Devices
Total Page 16 Pages
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