XR4151CP-F - V/F Converter, 8-22V, 100kHz | MaxLinear
MPN: XR4151CP-F ✓ Hoạt độngXR4151CP-F Tóm tắt
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.
Bộ thay thế dễ dàng lắp đặt cho XR4151CP-F — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
XR4151CP
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LM331N
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD537KH
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
RC4151N
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
NJM4151D
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
UA4151
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
XR4151CP-F Tỷ lệ tối đa & tính chất điện
| Chức năng | 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) |
| Phạm vi điện áp đầu vào | 0 V to 10 V (positive); +/-10 V with biasing |
| Kiểu đầu ra | Open-collector / open-drain pulse |
| Nhiệt độ hoạt động | 0 C to +70 C |
| Hộp | 8-PDIP (8-pin Plastic DIP) |
| Kiểu lắp đặt | Through-Hole |
| Số chân | 8 |
| Trạng thái RoHS | Compliant (lead-free -F suffix) |
| Lead-Free | Yes (per -F suffix) |
| Architecture | Precision current source + op-amp + one-shot timing |
Cấu hình chân XR4151CP-F
| Chân 1 | AMP OUT — Op-amp output for external RC integrator |
| Chân 2 | NC — Not connected (internal connection) |
| Chân 3 | VCC — Positive supply input (8 V to 22 V) |
| Chân 4 | CMP IN- — Comparator inverting input |
| Chân 5 | ONE-SHOT RC — One-shot timing RC network node |
| Chân 6 | GND — Ground (0 V reference) |
| Chân 7 | AMP IN- — Op-amp inverting input (signal input) |
| Chân 8 | VREF — Internal voltage reference output |
Ứng dụng tiêu biểu
XR4151CP-F phù hợp cho 6 Áp dụngs: 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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho XR4151CP-F — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | 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 |
Bảo phân biệt quan trọng
- 100 kHz full-scale ceiling - 10x higher than most legacy VFC ICs (vsLM331N)
- Bidirectional V/F and F/V in a single IC (vsRC4151N)
- Lead-free RoHS-compliant (-F suffix) for new designs (vsXR4151CP (non-F))
Ghi chú thiết kế
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.
Thông tin tuân thủ
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.
