Overview
The LM2917MX-8/NOPB is a frequency-to-voltage converter integrated circuit manufactured by Texas Instruments. This device is designed to convert input frequencies into proportional voltage outputs, making it suitable for various applications such as tachometers, speed sensors, and frequency measurement systems. The LM2917MX-8/NOPB features a high-gain operational amplifier and uses a charge pump technique to achieve high accuracy and low ripple in the output signal. It is available in an 8-pin SOIC package and is RoHS compliant, ensuring environmental sustainability.
Key Specifications
| Specification | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Part Number | LM2917MX-8/NOPB |
| Package Type | SOIC-8 |
| Maximum Frequency | 10 kHz |
| Linearity | ±0.3% (Typical) |
| Operating Temperature Range | -40°C to 85°C |
| Lead Free Status / RoHS Status | Lead Free / RoHS Compliant |
| Mounting Type | Surface Mount |
| Output Current Capability | Up to 50 mA (with Zener regulator) |
Key Features
- Ground-referenced tachometer input interfaces directly with variable reluctance magnetic pickups.
- Op Amp with floating transistor output capable of sinking or sourcing up to 50 mA.
- Frequency doubling for low ripple.
- Built-in hysteresis with either differential input or ground-referenced input.
- Output swings to ground for zero frequency input.
- Zener regulator on chip for accurate and stable frequency-to-voltage or current conversion.
- Full-input protection against voltage swings above VCC and below ground.
Applications
The LM2917MX-8/NOPB is versatile and can be used in a variety of applications, including:
- Tachometers and speed sensors.
- Frequency measurement systems.
- Relay, solenoid, meter, or LED control.
- Active filter conditioning of tachometer outputs.
- Automotive and industrial control systems where accurate frequency-to-voltage conversion is required.
Q & A
- What is the maximum frequency that the LM2917MX-8/NOPB can handle?
The LM2917MX-8/NOPB can handle frequencies up to 10 kHz. - What is the typical linearity of the LM2917MX-8/NOPB?
The typical linearity is ±0.3%. - What type of package does the LM2917MX-8/NOPB come in?
The LM2917MX-8/NOPB comes in an 8-pin SOIC package. - Is the LM2917MX-8/NOPB RoHS compliant?
Yes, the LM2917MX-8/NOPB is RoHS compliant. - What is the operating temperature range of the LM2917MX-8/NOPB?
The operating temperature range is -40°C to 85°C. - What is the maximum output current capability of the LM2917MX-8/NOPB?
The maximum output current capability is up to 50 mA with the Zener regulator. - Does the LM2917MX-8/NOPB have built-in protection features?
Yes, it has full-input protection against voltage swings above VCC and below ground. - Can the LM2917MX-8/NOPB be used with variable reluctance magnetic pickups?
Yes, the ground-referenced tachometer input interfaces directly with variable reluctance magnetic pickups. - What is the purpose of the Zener regulator on the LM2917MX-8/NOPB?
The Zener regulator allows for accurate and stable frequency-to-voltage or current conversion. - How does the output of the LM2917MX-8/NOPB behave at zero frequency input?
The output swings to ground for zero frequency input.
