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AD537JH The AD537 is a monolithic V-F converter consisting of an input amplifier, a precision oscillator system, an accurate internal reference 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 overall 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<br/> 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 (1μV/°C typ) input amplifier allows operation directly from small signals (e.g., thermocouples or strain gages) while offering a high (250 M(Ohm) 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 TO-116 ceramic DIP or a TO-100 metal can<br/> both are hermetically sealed packages.
The AD537 is available in three performance/temperature grades<br/> 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.
  • AD537JH
  • AD537JH
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Description

The AD537 is a monolithic V-F converter consisting of an input amplifier, a precision oscillator system, an accurate internal reference 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 overall 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 (1μV/°C typ) input amplifier allows operation directly from small signals (e.g., thermocouples or strain gages) while offering a high (250 M(Ohm) 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 TO-116 ceramic DIP or a TO-100 metal can
both are hermetically sealed packages. 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.

Not found, similar datasheet recommended

  • ECAD Module
  • Series: -
  • Brand: Analog Devices
  • DateCode: 96+
  • Package / Case: CAN-10
  • Packaging: Bulk
  • Part Status: Active
  • Type: Voltage to Frequency
  • Frequency - Max: 100kHz
  • Full Scale: ±30ppm/°C
  • Linearity: ±0.05%
  • Mounting Type: Through Hole
  • Supplier Device Package: TO-100-10
Similar Models VFC32

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ECAD Module

Product Attributes

  • AD537JH is a monolithic integrated circuit from Analog Devices. It is a precision, low-cost, low-power, single-supply, 8-bit analog-to-digital converter (ADC). Description: The AD537JH is an 8-bit, low-power, low-cost, single-supply, monolithic ADC. It operates from a single +5 V supply and features a fast conversion rate of 10 μs. The AD537JH has an input range of 0 V to +5 V and a reference input range of 0 V to +5 V. It features an on-chip reference and a built-in reference buffer. Features: 8-bit resolution Low power consumption Single +5 V supply Fast conversion rate of 10 μs Input range of 0 V to +5 V Reference input range of 0 V to +5 V On-chip reference Built-in reference buffer Applications: The AD537JH is suitable for a wide range of applications including data acquisition systems, instrumentation systems, and industrial process control systems. It is also suitable for use in medical imaging systems, automotive systems, and consumer electronics. (For reference only)

Preview of the first 3 pages of the data sheet

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  • AD537JH's pdf picture 2
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AD537­SPECIFICATIONS (typical @ +25C with VS (total) 36 V, unless otherwise noted)

fMAX = 10 kHz fMAX = 100 kHz Full-Scale Calibration Error = 0.01 µF, IIN 1.000 mA vs. Supply (fMAX < 100 kHz) vs. Temp (TMIN to TMAX)

Single Supply Dual Supply Input Bias Current
0 to (+VS ­ 4) Volts (min) ­VS to (+VS ­ 4) Volts (min)
(Trimmable in "D" Package Only) vs. Supply vs. Temp (TMIN to TMAX) Safe Input Voltage3
vs. Temp (TMIN to TMAX) vs. Supply Output Resistance4 Absolute Temperature Reference5
Initial Calibration @ +25°C Slope Error from 1.00 mV/K
VOUT 0.4 V max (TMIN to TMAX) 20 mA min Output Leakage Current in Logic "1"
(TMIN to TMAX) Logic Common Level Range

**Specifications same 1Nonlinearity is specified for a current input level (IIN) to the converter from 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 to +70°C for "J" and "K" devices, 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.

CIRCUIT OPERATION Block diagrams of the AD537 are shown above. A versatile operational amplifier (BUF) serves as the input stage; its purpose is to convert and scale the input voltage signal to a drive current in the NPN follower. Optimum performance is achieved when, at the full-scale input voltage, 1 mA drive current is delivered to the current-to-frequency converter. The drive current to the current-to-frequency converter (an astable multivibrator) provides both the bias levels and the charging current to the externally connected timing capacitor. This "adaptive" bias scheme allows the oscillator to provide low nonlinearity over the entire current input range to 2000 µA. The square wave oscillator output goes to the output driver which provides a floating base drive to the NPN power transistor. This floating drive allows the logic interface to be referenced to a different level than ­VS. The "SYNC" input ("D" package only) allows the oscillator to be slaved to an external master oscillator; this input can also be used to shut off the oscillator.

The reference generator uses a bandgap circuit (this allows single-supply operation to 4.5 volts which is not possible with low T.C. Zeners) to provide the reference and bias levels for the amplifier and oscillator stages. The reference generator also provides the precision, low T.C. 1.00 volt output and the VTEMP output which tracks absolute temperature at 1 mV/K.

V-F CONNECTION FOR POSITIVE INPUT VOLTAGES The positive voltage input range is from ­VS (ground in single supply operation) to 4 volts below the positive supply. The connection shown in Figure 1 provides a very high (250 M) input impedance. The input voltage is converted to the proper drive current at Pin 3 by selecting a scaling resistor. The full-scale current is 1 mA, so, for example a 10 volt range would require a nominal 10 k resistor. The trim range required will depend on capacitor tolerance. Full-scale currents other than 1 mA can be chosen, but linearity will be reduced; mA is the maximum allowable drive.

As indicated by the scaling relationship in Figure 0.01 µF timing capacitor will give a 10 kHz full-scale frequency, and 0.001 µF will give 100 kHz with 1 mA drive current. The maximum frequency is 150 kHz. Polystyrene or NPO ceramic capacitors are preferred for T.C. and dielectric absorption; polycarbonate or mica are acceptable; other types will degrade linearity. The capacitor should be wired very close to the AD537.

Figure 1. Standard V-F Connection for Positive Input Voltages

V-F CONNECTIONS FOR NEGATIVE INPUT VOLTAGE OR CURRENT A wide range of negative input voltages can be accommodated with proper selection of the scaling resistor, as indicated in Figure 2. This connection, unlike the buffered positive connection, is not high impedance since the 1 mA F.S. drive current must be supplied by the signal source. However, very large negative voltages beyond the supply can be handled easily; just modify the scaling resistors appropriately. Diode (HP50822811) is necessary for overload and latchup protection for current or voltage inputs.

If the input signal is a true current source, R1 and R2 are not used. Full-scale calibration can be accomplished by connecting 200 k pot in series with a fixed 27 k from Pin 7 to ­VS (see calibration section, below).

Figure 2. V-F Connections for Negative Input Voltage or Current

CALIBRATION There are two independent adjustments: scale and offset. The first is trimmed by adjustment of the scaling resistor R and the second by the (optional) potentiometer connected to +VS and the VOS pins ("D" package only). Precise calibration requires the use of an accurate voltage standard set to the desired FS value and a frequency meter; a scope is useful for monitoring output waveshape. Verification of linearity requires the availability of a switchable voltage source (or a DAC) having a linearity error below ± 0.005%, and the use of long measurement intervals to minimize count uncertainties. Every AD537 is automatically tested for linearity, and it will not usually be necessary to perform this verification, which is both tedious and time-consuming.

Although drifts are small it is good practice to allow the operating environment to attain stable temperature and to ensure that the supply, source and load conditions are proper. Begin by setting the input voltage 1/10,000 of full scale. Adjust the offset pot until the output frequency 1/10,000 of full scale (for example 1 Hz for of 10 kHz). This is most easily accomplished using a frequency meter connected to the output. Then apply the FS input voltage and adjust the gain pot until the desired FS frequency is indicated. In applications where the FS input is small, this adjustment will very slightly affect the offset voltage, due to the input bias current of the buffer amplifier. A change in R will affect the input by approximately 100 µV, which is as much mV FS range. Therefore, it may be necessary to repeat the offset and scale adjustments for the highest accuracy. The design of the input amplifier is such that the input voltage drift after offset nulling is typically below l µV/°C.

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    • AD537JH Electronic Component
    • AD537JH The AD537 is a monolithic V-F converter consisting of an input amplifier, a precision oscillator system, an accurate internal reference 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 overall 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 (1μV/°C typ) input amplifier allows operation directly from small signals (e.g., thermocouples or strain gages) while offering a high (250 M(Ohm) 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 TO-116 ceramic DIP or a TO-100 metal can
      both are hermetically sealed packages. 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.
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      AD537JH

      AD537JH has several brands around the world that may have alternate names for AD537JH due to regional differences or acquisition. AD537JH may also be known as the following names:

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