NJM4151M The NJM4151 provide a simple low-cost method of A/D conversion. They have all the inherent advantages of the voltage-to-frequency conversion technique. The Output of NJM4151 is a series of pulses of constant duration. The frequency of the pulses is proportional to the applied input voltage. These converters are designed for use in a wide range of data conversion and remote sensing applications.

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Description

The NJM4151 provide a simple low-cost method of A/D conversion. They have all the inherent advantages of the voltage-to-frequency conversion technique. The Output of NJM4151 is a series of pulses of constant duration. The frequency of the pulses is proportional to the applied input voltage. These converters are designed for use in a wide range of data conversion and remote sensing applications.

Not found, similar datasheet recommended

Title

V-F / F-V Convertor

ECAD Module
Manufacturer Part Number: NJM4151M
Brand: JRC
DateCode: 2000
Package / Case: SOP8
Category: Integrated Circuits (ICs)
Warranty: 100% Perfect Functions

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ECAD Module

Product Attributes

NJM4151M is a dual operational amplifier manufactured by JRC. It is an 8-pin SOP package. Description: The NJM4151M is a dual high-speed, low-noise operational amplifier with a wide gain bandwidth and low distortion. It features low power consumption, high slew rate, and low input bias current. Features: * Wide gain bandwidth: 1.2MHz * Low noise: 5.5nV/√Hz * Low distortion: 0.0006% * Low power consumption: 1.2mA * High slew rate: 0.7V/μs * Low input bias current: 0.2nA Applications: The NJM4151M is suitable for use in audio signal processing, instrumentation amplifiers, active filters, and other applications requiring high speed and low noise. (For reference only)

Preview of the first 3 pages of the data sheet

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applied input voltage. These converters are designed for use in a wide
range of data conversion and remote sensing applications.
FEATURES

PIN FUNCTION 1.Io (Current Source) 2.RS (Scale Factor) 3.VLO (Logic Output) 4.GND 5.Ro (One-Shot R,C) 6.Th (Threshold) 7.VI (Input Voltage) 8.V+

Conversion Accuracy Scale Factor Drift with Temperature
Input Comparator Offset Voltage Offset Current Input Bias Current Common Mode Range (Note 1)
One-Shot Threshold Voltage, Pin 5 Input Bias Current, Pin5 Reset VSAT
Current Source Output Current (Rs = 14.0k) Change with Voltage Off Leakage Reference Voltage
Note 1 : Input Common Mode Range includes ground.

PRINCIPLE OF OPERATION Single Supply Mode Voltage-to-Frequency Conversion In this application the NJM4151 functions as a stand-alone voltage to frequency converter operating on a single positive power supply. Refer to Figure 1, the simplified block diagram. The NJM4151 contains a voltage comparator, a one-shot, and a precision switched current source. The voltage comparator compares a positive input voltage applied at pin 7 to the voltage at pin 6. If the input voltage is higher, the comparator will fire the one-shot. The output of the one-shot is connected to both the logic output and the precision switched current source. During the one-shot period, T, the logic output will go low and the current source will turn on with current I. At the end of the one-shot period the logic output will go high and the current source will shut off. At this time the current source has injected an amount of charge = I0T into the network RB-CB. If this charge has not increased the voltage VB such that VB > VI, the comparator again fires the one-shot and the current source injects another lump of charge, Q, into the RB-CB network. This process continues until VB > VI. When this condition is achieved the current source remains off and the voltage VB decays until VB is again equal to VI. This completes one cycle. The VFC will now run in a steady state mode. The current source dumps lumps of charge into the capacitor CB at rate fast enough to keep VB VI. Since the discharge rate of capacitor CB is proportional to VB/RB, the frequency at which the system runs will be proportional to the input voltage.

Figure 1. Simplified Block Diagram, Single Supply Mode

The NJM4151 VFC is easy to use and apply if you understand the operation of it through the block diagram, Figure 1. Many users, though, have expressed the desire to understand the workings of the internal circuitry. The circuit can be divided into five sections: the internal biasing network, input comparator, one-shot, voltage reference, and the output current source.

The internal biasing network is composed of Q39-Q43. The N-channel FET Q43 supplies the initial current for zener diode Q39. The NPN transistor Q38 senses the zener voltage to derive the current reference for the multiple collector current source Q41. This special PNP transistor provides active pull-up for all of the other sections of the NJM4151. 2. The input comparator section is composed of Q1-Q7. PNP transistors Q1-Q4 form the special ground-sensing input which is necessary for VFC operation at low input voltages, NPN transistors Q5 and Q6 convert the differential signal to drive the second gain stage Q7. If the voltage on input pin 7 is less than that on threshold pin 6, the comparator will be off and the collector of Q7 will be in the high state. As soon as the voltage on pin 7 exceeds the voltage on pin 6, the collector of Q7 will go low and trigger the one-shot. 3. The one-shot is made from a voltage comparator and an R-S latch, Transistors Q12-Q15 and Q18-Q20 form the comparator, while Q8-Q11 and Q16-Q17 make up the R-S latch. One latch output, open-collector reset transistor Q16, is connected to a comparator input and to the terminal, pin 5. Timing resistor RO is tied externally from pin to V+ and timing

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Product Reviews

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10000 buyer reviews from United States

Kenneth Harris

NJM4151M

United States

Length of registration:7 years

The NJM4151M is an integrated circuit from Japan Radio Company (JRC) that offers excellent performance in a variety of applications. It is a dual operational amplifier with a wide range of features, including low noise, low distortion, and high output current. It is suitable for use in audio, video, and other signal processing applications. Utsource is a reliable distributor of electronic componen

Reply0

03/17/2023

Zlatan Avdic

NJM4151M

Canada Etobicoke

Length of registration:6 years

Hard to find part but you had it

Reply0

08/06/2020

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NJM4151M The NJM4151 provide a simple low-cost method of A/D conversion. They have all the inherent advantages of the voltage-to-frequency conversion technique. The Output of NJM4151 is a series of pulses of constant duration. The frequency of the pulses is proportional to the applied input voltage. These converters are designed for use in a wide range of data conversion and remote sensing applications.

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NJM4151M

NJM4151M has several brands around the world that may have alternate names for NJM4151M due to regional differences or acquisition. NJM4151M may also be known as the following names: