XR4151CP-F - V/F Converter, 8-22V, 100kHz | MaxLinear
Teilenummer: XR4151CP-F ✓ Aktiv| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $4.2 | $4,20 |
| 10 | $3.78 | $37,80 |
| 100 | $3.36 | $336,00 |
| 500 | $2.94 | $1.470,00 |
| 1.000 | $2.52 | $2.520,00 |
XR4151CP-F Übersicht
A voltage-to-frequency converter (V/F or VFC) is a mixed-signal building block that translates a continuous analog voltage into a stream of digital pulses whose repetition rate is precisely proportional to the input magnitude. VFCs sit within the broader hierarchy of analog-to-digital conversion techniques alongside successive-approximation ADCs, dual-slope integrating ADCs, and sigma-delta modulators, and are valued for their inherent monotonicity, excellent noise rejection, and galvanic isolation-friendly pulse output that can be transmitted through optocouplers or long cables.
Key features of the XR4151CP-F include a supply voltage range of 8 V to 22 V, very high noise rejection, inherent monotonicity over the full dynamic range, a single open-collector output stage that can interface with CMOS/TTL logic, and the ability to operate in reverse as a frequency-to-voltage converter with a small number of external components. The -F suffix denotes the lead-free, RoHS-compliant version of the original XR4151CP, while both share the same die and pinout.
The internal architecture consists of a precision current source, a high-gain operational amplifier, a comparator, and a one-shot timing network. The op-amp drives a current into an external RC network whose charging time determines output pulse width; this architecture eliminates the missing-pulse and non-monotonic errors that plague simple charge-pump VFCs. The dedicated low-leakage input protection on pin 7 prevents the inverting input from being driven below ground, eliminating the need for an external clamp diode in most applications.
Typical applications include precision analog-to-digital conversion where the output is fed to a counter or microcontroller capture input, isolated analog signal transmission across 4-20 mA replacement links, motor speed control via frequency-to-voltage conversion of tachometer pulses, and long-integral analog signal conditioning in industrial weighing, temperature, and pressure transmitters.
When designing with the XR4151CP-F, choose the external timing resistor and capacitor first - the resistor sets the input current range and full-scale frequency, while the capacitor sets the one-shot pulse width. Add a 0.01 uF bypass capacitor close to the supply pin and use low-leakage timing components to maintain the 0.05% linearity specification.
This page synthesizes distributor pricing, lead-time, pin-compatible alternatives, and practical design notes not found in the manufacturer datasheet, giving engineers a single-source decision framework for new designs and legacy XR4151CP replacement.
Drop-in-Alternativen für XR4151CP-F – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
XR4151CP
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
LM331N
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
AD537KH
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
RC4151N
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
NJM4151D
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
UA4151
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
XR4151CP-F Grenzwerte & elektrische Eigenschaften
| Funktion | Voltage-to-Frequency / Frequency-to-Voltage Converter |
| Supply Voltage Range | 8 V to 22 V |
| Full-Scale Frequency | 100 kHz |
| Frequency Operating Range | 1 Hz to 100 kHz |
| Linearity | +/-0.05% (typical at 10 kHz FS) |
| Eingangsspannungsbereich | 0 V to 10 V (positive); +/-10 V with biasing |
| Ausgangstyp | Open-collector / open-drain pulse |
| Betriebstemperatur | 0 C to +70 C |
| Gehäuse | 8-PDIP (8-pin Plastic DIP) |
| Montageart | Through-Hole |
| Pin-Anzahl | 8 |
| RoHS-Status | Compliant (lead-free -F suffix) |
| Lead-Free | Yes (per -F suffix) |
| Architecture | Precision current source + op-amp + one-shot timing |
XR4151CP-F Pin-Konfiguration
| Pin 1 | AMP OUT — Op-amp output for external RC integrator |
| Pin 2 | NC — Not connected (internal connection) |
| Pin 3 | VCC — Positive supply input (8 V to 22 V) |
| Pin 4 | CMP IN- — Comparator inverting input |
| Pin 5 | ONE-SHOT RC — One-shot timing RC network node |
| Pin 6 | GND — Ground (0 V reference) |
| Pin 7 | AMP IN- — Op-amp inverting input (signal input) |
| Pin 8 | VREF — Internal voltage reference output |
Typische Anwendungen
XR4151CP-F ist geeignet für 6 Anwendungs: Precision Analog-to-Digital Conversion, Isolated Analog Signal Transmission, Motor Speed Control (F/V Mode), Industrial Weighing Scale Front End, Frequency Panel Meter / RPM Display, Temperature Transmitter with Linearized Output.
Precision Analog-to-Digital Conversion
The XR4151CP-F's +/-0.05% linearity and 100 kHz full-scale ceiling make it well suited to medium-resolution ADC front ends in industrial instrumentation. It converts a 0-10 V analog input into a proportional pulse train that a microcontroller capture timer or external counter can resolve to 10-12 bit effective resolution when integrated over a fixed gate window. Its inherent monotonicity eliminates missing codes that plague integrating ADCs near full scale. The XR4151CP-F replaces expensive 12-bit SAR ADCs in weighing scales, panel meters, and process controllers where 0.1% absolute accuracy is acceptable and the galvanic isolation benefit of a pulse output matters.
Empfohlen
Isolated Analog Signal Transmission
The XR4151CP-F is a strong fit for 4-20 mA loop replacement links that require galvanic isolation across high common-mode voltages. Its open-collector pulse output drives an optocoupler LED directly with no extra driver stage, allowing the analog signal to cross isolation barriers of 5 kV or higher in industrial settings. On the receiving side, a second XR4151CP-F wired in F/V mode reconstructs a clean DC voltage with the same +/-0.05% linearity. This VFC-plus-optocoupler technique outperforms analog isolation amplifiers in noise rejection and offers inherent noise immunity through the digital pulse-train nature of the transmission.
Empfohlen
Motor Speed Control (F/V Mode)
When wired in the reverse F/V configuration, the XR4151CP-F accepts a digital tachometer pulse train from an optical or Hall-effect sensor and outputs a DC voltage proportional to motor RPM. Its +/-0.05% linearity maintains tight speed regulation across the operating range, and the open-collector input stage handles 5 V to 24 V tachometer logic levels without extra signal conditioning. The output drives a PWM motor controller reference input directly, closing the speed-control loop with analog stability. Industrial applications include conveyor drives, pump controllers, and fan-speed regulation in HVAC equipment.
Empfohlen
Industrial Weighing Scale Front End
Load-cell signals in industrial weighing scales are typically 0-30 mV full scale and require high-gain amplification before digitization. The XR4151CP-F follows a low-noise instrumentation amplifier (such as the INA128) and provides a robust VFC output that integrates the analog weight signal over a fixed gate window, eliminating the need for a precision ADC. The result is a low-cost 10-12 bit weighing system with +/-0.05% linearity, immune to ground loops thanks to the digital pulse interface to the host microcontroller. Compared to sigma-delta ADCs, the VFC approach is simpler and cheaper for batch-process scales that do not require high-speed updates.
Empfohlen
Frequency Panel Meter / RPM Display
The XR4151CP-F simplifies frequency panel meter designs by converting an unknown input frequency directly into a DC voltage that drives a moving-coil meter movement or ADC. Its 1 Hz to 100 kHz operating range covers audio-band and industrial-tachometer frequencies without prescalers. The +/-0.05% linearity enables accurate RPM indication in motor test stands, audio-frequency counters, and engine diagnostics equipment. Unlike dedicated frequency-to-voltage ICs, the XR4151CP-F also supports the V/F forward direction, allowing a single IC to serve dual roles in test equipment.
Empfohlen
Temperature Transmitter with Linearized Output
In 4-wire RTD or thermocouple temperature transmitters, the XR4151CP-F converts a linearized sensor signal into a pulse train that travels across an isolation barrier to a receiver. Combined with a sensor linearization network (such as a polynomial op-amp circuit for thermocouples), the VFC provides a digital output that is intrinsically monotonic and immune to analog noise pickup. The result is a robust industrial temperature transmitter with +/-0.05% linearity over the 0-100 C measurement range. This approach is widely used in process-control loops where 4-20 mA current loops have been replaced with digital pulse transmission for higher noise immunity.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für XR4151CP-F – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | XR4151CP | LM331N | AD537KH | RC4151N | NJM4151D | UA4151 |
|---|---|---|---|---|---|---|---|
| Package | 8-PDIP (through-hole) | 8-PDIP (through-hole) | 8-PDIP (through-hole) | 8-PDIP (or TO-99 metal can) | 8-PDIP (through-hole) | 8-DIP (through-hole) | 8-PDIP (through-hole) |
| Brand | MaxLinear | MaxLinear / Exar | Texas Instruments | Analog Devices | Raytheon Semiconductor | NJR (New Japan Radio) | Texas Instruments |
| Function | V/F and F/V Converter | V/F and F/V Converter | V/F and F/V Converter | V/F and F/V Converter | V/F Converter | V/F Converter | V/F Converter |
| Supply Voltage Range | 8 V to 22 V | 8 V to 22 V | 4 V to 40 V | 5 V to 36 V | +/-15 V typical | +/-15 V typical | +/-15 V typical |
| Full-Scale Frequency | 100 kHz | 100 kHz | 10 kHz (typical app) | 100 kHz | 10 kHz | 10 kHz | 10 kHz |
| Linearity | +/-0.05% | +/-0.05% | +/-0.03% to +/-0.1% | +/-0.05% | +/-0.05% | +/-0.1% | +/-0.05% |
| Operating Temperature | 0 C to +70 C | 0 C to +70 C | 0 C to +70 C | 0 C to +70 C | -40 C to +85 C (military) | -20 C to +75 C | -55 C to +125 C (military) |
| RoHS Compliance | Yes (lead-free -F suffix) | No (SnPb lead finish) | Yes (lead-free) | Varies by date code | No (legacy) | Varies by date code | Varies by date code |
Wichtigste Unterscheidungsmerkmale
- 100 kHz full-scale ceiling - 10x higher than most legacy VFC ICs (vs. LM331N)
- Bidirectional V/F and F/V in a single IC (vs. RC4151N)
- Lead-free RoHS-compliant (-F suffix) for new designs (vs. XR4151CP (non-F))
Designhinweise
Estimated: Use a low-leakage diode (e.g., 1N4148) from pin 7 to pin 6 if the input signal can swing below ground. The XR4151's internal protection prevents the inverting input from going below 0 V by approximately one diode drop, but high-leakage external protection diodes will degrade the +/-0.05% linearity specification. Use Schottky diodes (e.g., BAT85) for sub-1 mA input currents where leakage matters most.
Estimated: Add a 0.01 uF ceramic bypass capacitor within 5 mm of pin 3 (VCC) and pin 6 (GND). The XR4151CP-F draws approximately 500 mW from an 8-22 V supply, and supply noise directly translates to output frequency instability. For best linearity, use a low-noise linear regulator (e.g., LM7815) rather than a switching pre-regulator feeding the XR4151CP-F supply pin.
Keep the external timing resistor and capacitor as close to pins 4 and 5 as physically possible. Long PCB traces on these nodes add stray capacitance that shifts the one-shot pulse width and degrades linearity. Use a ground plane on the bottom layer directly under the IC; the 8-pin PDIP has no thermal pad but does benefit from copper pour for thermal dissipation above 70 C ambient.
Compliance-Informationen
RoHS and REACH compliance verified per MaxLinear product page and the -F suffix designation. The XR4151CP-F is not AEC-Q100 qualified; it is intended for industrial and consumer applications, not automotive.
