PMIC - V/F and F/V Converters

Part Number	Description / PDF	Quantity
LM2917N/NOPB	LM2917-N FREQUENCY TO VOLTAGE CO	13750
LM2917MX/NOPB Texas Instruments	IC F/V CONV 10KHZ 14SOIC	10707
LM231N/NOPB Texas Instruments	IC V/F CONV 100KHZ 8DIP	49710000
LM2907MX-8/NOPB Texas Instruments	IC F/V CONV 10KHZ 8SOIC	12900
AD7741YR Analog Devices, Inc.	VOLTAGE TO FREQUENCY CONVERTER	0
NJM4151D New Japan Radio (NJR)	IC F/V & V/F CONV 100KHZ 8DIP	1825
LM2917MX-8 Texas Instruments	ANALOG DATA CONVERTR	5000
LM231AN/NOPB Texas Instruments	IC V/F CONV 100KHZ 8DIP	934110000
VFC32KUG4 Texas Instruments	IC F/V & V/F CONV 100KHZ 14SOIC	10000
ADVFC32BH Analog Devices, Inc.	IC F/V & V/F CONV 500KHZ TO100	482
LM2917M-8 Texas Instruments	IC F/V CONV 10KHZ 8SOIC	4449975
LM331N Texas Instruments	VOLTAGE TO FREQUENCY CONVERTER	0
AD652JPZ Analog Devices, Inc.	IC V/F CONV 2MHZ 20PLCC	312
LM2917MX	VOLTAGE TO FREQUENCY CONVERTER,	5000
VFC32KP Texas Instruments	IC F/V & V/F CONV 100KHZ 14DIP	5510000
LM2917M-8/NOPB Texas Instruments	IC F/V CONV 10KHZ 8SOIC	5869975
AD654JNZ Analog Devices, Inc.	IC V/F CONV 500KHZ 8DIP	1086
ADVFC32SH Analog Devices, Inc.	IC F/V & V/F CONV 500KHZ TO100	55
AD652BQ Analog Devices, Inc.	IC V/F CONV 2MHZ 16CDIP	243
AD537SH Analog Devices, Inc.	IC V/F CONV 100KHZ TO100-10	42

PMIC - V/F and F/V Converters

1. Overview

PMIC (Power Management Integrated Circuit) V/F (Voltage-to-Frequency) and F/V (Frequency-to-Voltage) converters are specialized signal conditioning ICs that enable bidirectional conversion between analog voltage signals and digital frequency signals. These converters play a critical role in industrial automation, precision measurement, and sensor interfacing applications where noise immunity and galvanic isolation are essential. Their ability to transform signals into frequency domains enhances resistance to electromagnetic interference (EMI) and simplifies long-distance signal transmission.

2. Major Types and Functional Classification

Type	Functional Characteristics	Application Examples
Basic V/F Converters	Linear voltage-to-frequency transfer, typical ranges 0-10V to 1kHz-100kHz	Simple sensor signal conditioning
High-Precision F/V	0.01% nonlinearity, temperature compensation	Calibration equipment
Bidirectional Converters	Automatic mode switching, isolation amplifiers integrated	Motor speed control systems
Wideband V/F	Up to 1MHz frequency range, fast transient response	Communication systems

3. Structural Composition

Typical physical structure includes:

Input conditioning stage (attenuation/amplification)
Conversion core (voltage-controlled oscillator or phase-locked loop)
Temperature compensation circuitry
Output driver (CMOS/TTL compatible)
Power supply regulation section

Advanced packages integrate isolation barriers (capacitive or inductive) for high-voltage applications.

4. Key Technical Specifications

Parameter	Description	Importance
Conversion Accuracy	Typically 0.01-0.5% of full scale	Determines measurement precision
Frequency Range	1Hz to 10MHz operational bandwidth	Defines application scope
Temperature Stability	5ppm/ C drift	Affects reliability in harsh environments
Power Supply Rejection	80dB typical	Reduces noise sensitivity
Isolation Voltage	Up to 5kV RMS	Safety and noise isolation

5. Application Areas

Industrial automation (PLC analog I/O modules)
Electric vehicle battery management systems
Aerospace sensor interfaces (vibration, pressure)
Smart grid metering equipment
Medical diagnostic devices

Case Study: In CNC machine tools, V/F converters interface analog position sensors with digital control systems, achieving 0.02% positioning accuracy.

6. Leading Manufacturers and Products

Manufacturer	Product Series	Key Features
Texas Instruments	VFC32K	16-bit resolution, 100kHz bandwidth
Analog Devices	AD654	Low-power, 1MHz output
STMicroelectronics	LTC690	Programmable oscillator, 0.2% accuracy
Maxim Integrated	MAX331	Galvanic isolation up to 5kV

7. Selection Guidelines

Define required conversion direction (uni/bidirectional)
Evaluate signal bandwidth requirements
Assess environmental conditions (temperature, vibration)
Consider isolation requirements for safety
Analyze cost/performance trade-offs

Recommendation: For industrial process control, prioritize temperature stability (>0.05%/ C) and isolation voltage (>2.5kV).

8. Industry Trends

Key development directions include:

Integration with digital interfaces (I2C, SPI)
Embedded self-calibration algorithms
Reduced package sizes (DFN, BGA formats)
Lower power consumption (<10 A standby current)
Increased radiation hardness for aerospace applications