PMIC - V/F and F/V Converters

Part Number	Description / PDF	Quantity
LM2917N-8/NOPB Texas Instruments	IC F/V CONV 10KHZ 8DIP	30701160
AD650KN Analog Devices, Inc.	VOLTAGE TO FREQUENCY CONVERTER	7108
LM2907M Texas Instruments	LM2907-N FREQUENCY TO VOLTAGE CO	94
TC9400CPD Roving Networks / Microchip Technology	IC F/V & V/F CONV 100KHZ 14DIP	69
AD7740KRMZ Analog Devices, Inc.	IC V/F CONV 1MHZ 8MSOP	0
AD650JN Analog Devices, Inc.	VOLTAGE TO FREQUENCY CONVERTER	7384
AD537KD Analog Devices, Inc.	VOLTAGE-TO-FREQUENCY CONVERTER	8263
VFC320CP Texas Instruments	IC F/V & V/F CONV 1MHZ 14DIP	2253000
AD7750AR Analog Devices, Inc.	SINGLE PHASE METERING IC	5034
AD7740KRM Analog Devices, Inc.	VOLTAGE TO FREQUENCY CONVERTER	9083
AD652JPZ-REEL7 Analog Devices, Inc.	IC V/F CONV 2MHZ 20PLCC	125
LM2917M/NOPB Texas Instruments	IC F/V CONV 10KHZ 14SOIC	3949955
LM331N/NOPB Texas Instruments	IC V/F CONV 100KHZ 8DIP	2812
AD7740YRT-REEL7 Analog Devices, Inc.	VOLTAGE TO FREQUENCY CONVERTER	2434
AD7741YRZ Analog Devices, Inc.	IC V/F CONV 6.144MHZ 8SOIC	511
AD7742BN Analog Devices, Inc.	VOLTAGE TO FREQUENCY CONVERTER,	0
AD42957 Analog Devices, Inc.	IC, SYNC V/F CONVERTER IC	2722
VFC32SMQ Burr-Brown (Texas Instruments)	VOLTAGE TO FREQUENCY CONVERTER	0
AD42949 Analog Devices, Inc.	IC, SYNC V/F CONVERTER IC	67
AD7742BNZ Analog Devices, Inc.	VOLTAGE TO FREQUENCY CONVERTER	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