TC9401CPD

Overview

The TC9401CPD is a Voltage-to-Frequency and Frequency-to-Voltage converter manufactured by Microchip Technology. It utilizes low-power CMOS technology to accept variable analog input signals and generate linearly proportional output pulse trains or voltages. The device supports single or dual supply operation ranging from +8V to +15V or ±4V to ±7.5V. It features a full-scale frequency range of DC to 100 kHz for F/V mode and 1 Hz to 100 kHz for V/F mode, with typical linearity errors of 0.01% in V/F mode and 0.02% in F/V mode.

Feature Summary

• Offers high-precision linearity performance with specified error margins of 0.01% for voltage-to-frequency conversion and 0.02% for frequency-to-voltage conversion.
• Operates effectively across a wide frequency spectrum, supporting DC to 100 kHz for frequency-to-voltage applications and 1 Hz to 100 kHz for voltage-to-frequency applications.
• Provides flexible power supply configurations, accommodating both single-ended supplies up to 15V and dual symmetric supplies within the ±4V to ±7.5V range.

Applications

• Microprocessor data acquisition systems
• Analog data transmission and recording circuits
• Phase locked loops
• Frequency meters and tachometers

Procurement Notes

Verify that the specific suffix 'CPD' corresponds to the commercial temperature range (0°C to +70°C) and the 14-pin Plastic DIP package as documented in the official datasheet. Confirm that the ordering information matches the manufacturer's current production status and packaging specifications before finalizing procurement decisions.

Selection Notes

Select the TC9401CPD when application requirements demand superior linearity compared to standard variants, specifically requiring 0.01% V/F and 0.02% F/V accuracy. Ensure the design environment operates within the commercial temperature limits and utilizes the PDIP-14 through-hole package format compatible with the selected PCB layout constraints.

Part Context

This component belongs to the TC9400/9401/9402 family of charge-balancing converters. While sharing identical pinouts and core architecture, the TC9401 variant is distinguished by its tighter linearity specifications. It serves as a high-accuracy alternative to the TC9400 and TC9402 models within the same product series.

Replacement Considerations

The TC9400CPD and TC9402CPD are direct pin-compatible substitutes within the same package. Note that these alternatives offer different linearity specifications (0.05% and 0.25%, respectively). Verify if the reduced accuracy meets the system requirements before substitution.

FAQ

How does the TC9401 achieve its high linearity specification?

The device utilizes a charge balancing technique where the input current is balanced against fixed charges from a reference voltage, ensuring the output frequency remains linearly proportional to the input voltage.

What is the function of the Threshold Detector input pin?

In V/F mode, it triggers a pulse when the op amp output crosses a threshold. In F/V mode, it accepts the input frequency waveform to initiate the charge dispensing process.