PMIC - V/F and F/V Converters

Part Number	Description / PDF	Quantity
LM2907MX Texas Instruments	IC F/V CONV 10KHZ 14SOIC	10000
VFC32KU/2K5 Texas Instruments	VFC32 VOLTAGE-TO-FREQUENCY AND F	7141
LM2907M-8/NOPB Texas Instruments	IC F/V CONV 10KHZ 8SOIC	18349975
LM2917MX-8/NOPB Texas Instruments	IC F/V CONV 10KHZ 8SOIC	135410000
LM2917M Texas Instruments	VOLTAGE TO FREQUENCY CONVERTER	1435
LM331AN/NOPB Texas Instruments	IC V/F CONV 100KHZ 8DIP	48010000
LM2917N-8/NOPB Texas Instruments	IC F/V CONV 10KHZ 8DIP	30701160
LM2907M Texas Instruments	LM2907-N FREQUENCY TO VOLTAGE CO	94
VFC320CP Texas Instruments	IC F/V & V/F CONV 1MHZ 14DIP	2253000
LM2917M/NOPB Texas Instruments	IC F/V CONV 10KHZ 14SOIC	3949955
LM331N/NOPB Texas Instruments	IC V/F CONV 100KHZ 8DIP	2812
LM2917N Texas Instruments	IC F/V CONV 10KHZ 14DIP	0
LM2917N-8 Texas Instruments	IC F/V CONV 10KHZ 8DIP	0
LM2907MX-8 Texas Instruments	IC F/V CONV 10KHZ 8SOIC	0
LM2907N Texas Instruments	IC F/V CONV 10KHZ 14DIP	0
LM331AN Texas Instruments	IC V/F CONV 100KHZ 8DIP	0
RV4151NB Texas Instruments	IC V/F CONV 100KHZ 8DIP	0

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