PMIC - V/F and F/V Converters

Part Number	Description / PDF	Quantity
AD7740YRM Analog Devices, Inc.	VOLTAGE TO FREQUENCY CONVERTER	0
AD650BD Analog Devices, Inc.	VOLTAGE TO FREQUENCY CONVERTER,	11201
VFC32KPG4 Texas Instruments	IC F/V & V/F CONV 100KHZ 14DIP	10000
AD652SQ Analog Devices, Inc.	IC V/F CONV 2MHZ 16CDIP	39
TC9400EOD Roving Networks / Microchip Technology	IC F/V & V/F CONV 100KHZ 14SOIC	182
VFC32KU Texas Instruments	IC F/V & V/F CONV 100KHZ 14SOIC	4219350
AD652JP-REEL Analog Devices, Inc.	VOLTAGE TO FREQUENCY CONVERTER	955
AD654JR Analog Devices, Inc.	VOLTAGE TO FREQUENCY CONVERTER	618
AD537JD Analog Devices, Inc.	IC V/F CONV 100KHZ 14CDIP	9
VFC110AP Texas Instruments	IC V/F CONV 4MHZ 14DIP	1458775
AD537KD/+ Analog Devices, Inc.	VOLTAGE-TO-FREQUENCY CONVERTER	4387
AD537SD Analog Devices, Inc.	VOLTAGE-TO-FREQUENCY CONVERTER	2843
LM2907M/NOPB Texas Instruments	IC F/V CONV 10KHZ 14SOIC	11209955
LM231N	VOLTAGE TO FREQUENCY CONVERTER,	1190
AD650JNZ Analog Devices, Inc.	IC F/V & V/F CONV 1MHZ 14DIP	72
AD7740KRM-REEL7 Analog Devices, Inc.	VOLTAGE TO FREQUENCY CONVERTER	1896
AD7741BRZ Analog Devices, Inc.	IC V/F CONV 6.144MHZ 8SOIC	304
AD7750AN Analog Devices, Inc.	SINGLE PHASE METERING IC	108529
ADVFC32SH/883B Analog Devices, Inc.	IC F/V & V/F CONV 500KHZ TO100	4
VFC320CPG4 Texas Instruments	IC F/V & V/F CONV 1MHZ 14DIP	2875

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