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Analog Devices Semiconductor Electronic Components Datasheet

AD537 Datasheet

Integrated Circuit Voltage-to-Frequency Converter

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AD537 pdf
a
FEATURES
Low Cost A–D Conversion
Versatile Input Amplifier
Positive or Negative Voltage Modes
Negative Current Mode
High Input Impedance, Low Drift
Single Supply, 5 V to 36 V
Linearity: ؎0.05% FS
Low Power: 1.2 mA Quiescent Current
Full-Scale Frequency up to 100 kHz
1.00 V Reference
Thermometer Output (1 mV/K)
F-V Applications
MIL-STD-883 Compliant Versions Available
Integrated Circuit
Voltage-to-Frequency Converter
AD537*
PIN CONFIGURATIONS
D-14 Package
H-10A Package
LOGIC GND 1
SYNC 2
IIN 3
–VIN 4
+VIN 5
VTEMP 6
VREF 7
LOGIC GND
10
AD537
14 OUTPUT
–VIN 1
AD537
9 OUTPUT
DRIVER
13 +VS +VIN 2
DRIVER
8 +VS
CURR-
BUF TO-FREQ
CONV
VT PRECISION
VOLTAGE
VR REFERENCE
12 CAP
11 CAP
CURR-
TO-FREQ
BUF CONV
10 VOS
9 VOS
8 –VS
3
VTEMP
VT PRECISION
VR
VOLTAGE
REFERENCE
4
VREF
5
7
CAP
6
CAP
–VS
(CONNECTED TO CASE)
PRODUCT DESCRIPTION
The AD537 is a monolithic V-F converter consisting of an input
amplifier, a precision oscillator system, an accurate internal ref-
erence generator and a high current output stage. Only a single
external RC network is required to set up any full-scale (F.S.)
frequency up to 100 kHz and any F.S. input voltage up to
± 30 V. Linearity error is as low as ± 0.05% for 10 kHz F.S., and
operation is guaranteed over an 80 dB dynamic range. The over-
all temperature coefficient (excluding the effects of external
components) is typically ± 30 ppm/°C. The AD537 operates
from a single supply of 5 V to 36 V and consumes only 1.2 mA
quiescent current.
A temperature-proportional output, scaled to 1.00 mV/K,
enables the circuit to be used as a reliable temperature-to-
frequency converter; in combination with the fixed reference
output of 1.00 V, offset scales such as 0°C or 0°F can be generated.
The low drift (1 µV/°C typ) input amplifier allows operation
directly from small signals (e.g., thermocouples or strain gages)
while offering a high (250 M) input resistance. Unlike most
V–F converters, the AD537 provides a square-wave output, and
can drive up to 12 TTL loads, LEDs, very long cables, etc.
The excellent temperature characteristics and long-term stability
of the AD537 are guaranteed by the primary bandgap reference
generator and the low T.C. silicon chromium thin film resistors
used throughout.
The device is available in either a 14-lead ceramic DIP or a 10-lead
metal can; both are hermetically sealed packages.
*Protected by Patent Nos. 3,887,963 and RE 30,586.
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 AD537 is available in three performance/temperature
grades; the J and K grades are specified for operation over the
0°C to +70°C range while the AD537S is specified for operation
over the extended temperature range, –55°C to +125°C.
PRODUCT HIGHLIGHTS
1. The AD537 is a complete V-F converter requiring only an
external RC timing network to set the desired full-scale fre-
quency and a selectable pull-up resistor for the open collec-
tor output stage. Any full-scale input voltage range from
100 mV to 10 volts (or greater, depending on +VS) can be
accommodated by proper selection of timing resistor. The
full-scale frequency is then set by the timing capacitor from
the simple relationship, f = V/10RC.
2. The power supply requirements are minimal, only 1.2 mA
quiescent current is drawn from a single positive supply from
4.5 volts to 36 volts. In this mode, positive inputs can vary
from 0 volts (ground) to (+VS – 4) volts. Negative inputs can
easily be connected for below ground operation.
3. F-V converters with excellent characteristic are also easy to
build by connecting the AD537 in a phase-locked loop. Ap-
plication particulars are shown in Figure 6.
4. The versatile open-collector NPN output stage can sink up
to 20 mA with a saturation voltage less than 0.4 volts. The
Logic Common terminal can be connected to any level be-
tween ground (or –VS) and 4 volts below +VS. This allows
easy direct interface to any logic family with either positive or
negative logic levels.
5. The AD537 is available in versions compliant with MIL-
STD-883. Refer to the Analog Devices Military Product
Databook or current AD537/883B 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


Analog Devices Semiconductor Electronic Components Datasheet

AD537 Datasheet

Integrated Circuit Voltage-to-Frequency Converter

No Preview Available !

AD537 pdf
AD537–SPECIFICATIONS (typical @ +25؇C with VS (total) = 5 V to 36 V, unless otherwise noted)
Model
AD537JH
AD537JD
AD537KD
AD537KH
CURRENT-TO-FREQUENCY CONVERTER
Frequency Range
Nonlinearity1
0 kHz to 150 kHz
fMAX = 10 kHz
fMAX = 100 kHz
Full-Scale Calibration Error
0.15% max (0.1% typ)
0.25% max (0.15% typ)
C = 0.01 µF, IIN = 1.000 mA
vs. Supply (fMAX < 100 kHz)
vs. Temp (TMIN to TMAX)
± 10% max
± 0.1%/V max (0.01% typ)
± 150 ppm/°C max (50 ppm typ)
ANALOG INPUT AMPLIFIER
(Voltage-to-Current Converter)
Voltage Input Range
Single Supply
Dual Supply
Input Bias Current
0 to (+VS – 4) Volts (min)
–VS to (+VS – 4) Volts (min)
(Either Input)
Input Resistance (Noninverting)
100 nA
250 M
Input Offset Voltage
(Trimmable in “D” Package Only)
vs. Supply
vs. Temp (TMIN to TMAX)
Safe Input Voltage3
5 mV max
200 µV/V max
5 µV/°C
± VS
REFERENCE OUTPUTS
Voltage Reference
Absolute Value
vs. Temp (TMIN to TMAX)
vs. Supply
Output Resistance4
Absolute Temperature Reference5
1.00 Volt ± 5% max
50 ppm/°C
± 0.03%/V max
380
Nominal Output Level
1.00 mV/K
Initial Calibration @ +25°C
Slope Error from 1.00 mV/K
Slope Nonlinearity
Output Resistance5
298 mV (± 5 mV typ)
± 0.02 mV/K
± 0.1 K
900
*
*
*
± 7% max
*
*
*
*
*
*
*
100 µV/V max
*
*
*
*
*
*
*
*
*
*
*
*
0.07% max
0.1% max
± 5% max
*
50 ppm/°C max (30 ppm typ)2
*
*
*
*
2 mV max
100 µV/V max
1 µV/°C
*
*
100 ppm/°C max
*
*
*
298 mV (± 5 mV max)
*
*
*
OUTPUT INTERFACE (Open Collector Output)
(Symmetrical Square Wave)
Output Sink Current in Logic “0”
VOUT = 0.4 V max (TMIN to TMAX) 20 mA min
Output Leakage Current in Logic “1”
(TMIN to TMAX)
Logic Common Level Range
Rise/Fall Times (CT = 0.01 µF)
IIN = l mA
IIN = 1 µA
200 nA max
–VS to (+VS – 4) Volts
0.2 µs
1 µs
POWER SUPPLY
Voltage, Rated Performance
Single Supply
4.5 V to 36 V
Dual Supply
± 5 V to ± 18 V
Quiescent Current
1.2 mA (2.5 mA max)
20 mA min
*
*
*
*
20 mA min
*
*
*
*
**
**
**
TEMPERATURE RANGE
Rated Performance
Storage
PACKAGE OPTIONS6, 7
D-14 Ceramic DIP
H-10A Header
0°C to +70°C
–65°C to +150°C
AD537JH
*
*
AD537JD
*
*
AD537KD
AD537KH
AD537SD1
AD537SH1
*
**
**
**
*
250 ppm/°C max
*
*
*
*
**
**
10 µV/°C max
*
*
**
*
*
*
**
*
*
*
10 mA min
2 µA max
*
*
*
*
*
*
–55°C to +125°C
*
AD537SD
AD537SH
NOTES
*Specifications same as AD537JH.
**Specifications same as AD537K.
1Nonlinearity is specified for a current input level (IIN) to the converter from 0.1 µA to 1000 µA. Converter has 100% overrange capability up to IIN = 2000 µA with slightly
reduced linearity. Nonlinearity is defined as deviation from a straight line from zero to full scale, expressed as a percentage of full scale.
2Guaranteed not tested.
3Maximum voltage input level is equal to the supply on either input terminal. However, large negative voltage levels can be applied to the negative terminal if the input is scaled to
a nominal 1 mA full scale through an appropriate value resistor (See Figure 2).
4Loading the 1.0 volt or 1 mV/K outputs can cause a significant change in overall circuit performance, as indicated in the applications section. To maintain normal operation,
these outputs should be operated into the external buffer or an external amplifier.
5Temperature reference output performance is specified from 0°C to +70°C for “J” and “K” devices, –55°C to +125°C for “S” model.
6D = Ceramic DIP; H = Hermetic Metal Can. For outline information see Package Information section.
7For AD537/883B specifications, refer to Analog Devices Military Products Databook.
Specifications subject to change without notice.
–2– REV. C


Part Number AD537
Description Integrated Circuit Voltage-to-Frequency Converter
Maker Analog Devices
Total Page 8 Pages
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