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D4C3570
Electronics Part Number
D4C3570-WXManufacturer
Texas Instruments
D4C3570
Description
3.5-7.0GHz circulatorInventory
388 Pcs New Original In Stock
High-performance RF/wireless parts with optimized electrical specs; designed for seamless integration in transceivers and antennas.
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Minimum 1
Minimum 1
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Basic cost: USD 70.00
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Technical Specifications
Category
Power Management (PMIC), V/F and F/V Converters
Manufacturer
Texas Instruments
Packaging
-
Mounting Type
Through Hole
Package / Case
14-DIP (0.300", 7.62mm)
Series
-
Base Product Number
LM2907
Product Status
Obsolete
Type
Frequency to Voltage
Supplier Device Package
14-PDIP
Frequency - Max
10 kHz
Linearity
±0.3%
Full Scale
-
Data Sheet Document (D)
Datasheets
Download LM2907N Product Specification (PDF)
HTML Datasheet
LM2907N-DG
Environmental & Export Classification
RoHS Status
RoHS non-compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Standard Package
25
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Frequently Asked Questions (FAQ)
Can the LM2907N be used as a reliable replacement for the LM2907N/NOPB in new designs given its obso
While the LM2907N is functionally identical to the LM2907N/NOPB and can serve as a drop-in replacement in existing designs, it is not recommended for new designs due to its obsolete status and RoHS non-compliance. Using the LM2907N introduces supply chain risks and potential regulatory issues in markets requiring RoHS compliance. For new designs, consider upgrading to RoHS-compliant alternatives like the LM2907S/NOPB or redesigning with modern frequency-to-voltage converters such as the LTC1799, ensuring long-term availability and compliance. If you must use the LM2907N, secure a sufficient lifetime buy and verify end-market regulatory requirements.
What are the key design-in risks when integrating the LM2907N in a high-noise automotive environment
Integrating the LM2907N in automotive applications poses risks due to its sensitivity to power supply noise and lack of built-in EMI filtering. Although commonly used in tachometer circuits, the LM2907N's analog comparator and charge pump are susceptible to voltage transients common in 12V systems. Mitigate risks by adding a dedicated LC filter on Vcc, using a low-ESR bypass capacitor close to the supply pin, and shielding the input signal with a Schmitt trigger buffer. Ensure the pull-up capacitor (C1) and timing resistor (R1) are located near the IC to minimize parasitic pickup that could distort frequency response.
How does the ±0.3% linearity of the LM2907N perform across temperature in precision measurement appl
The LM2907N's specified ±0.3% linearity is typically measured at room temperature and can degrade over industrial temperature ranges (-40°C to +85°C), especially in high-humidity environments. In precision applications like engine speed monitoring, this drift may introduce significant calibration errors. Designers should characterize linearity across the full operating range and include temperature compensation in firmware if used with a microcontroller. Consider calibrating at multiple frequencies during system test to maintain accuracy, or evaluate more stable alternatives like the TC9400 for critical applications requiring tighter linearity over temperature.
What are the main integration challenges when replacing a LM555-based frequency-to-voltage circuit w
Replacing a LM555-based F-V converter with the LM2907N improves accuracy and reduces component count, but introduces new design constraints. The LM2907N requires precise selection of the timing capacitor (C1) and resistor (R2) to set full-scale output, and improper values can lead to frequency clipping or poor low-end response. Unlike the LM555, the LM2907N's output is current-sourced and requires an external pull-up resistor and filtering capacitor. Designers must also ensure input signal amplitude meets the internal Schmitt trigger thresholds (typically 1.4V min), which may require signal conditioning if driving from low-level sensors.
Is the LM2907N suitable for use in battery-powered systems considering its power consumption and pac
The LM2907N is not ideal for battery-powered systems due to its relatively high quiescent current (around 6 mA typical) and through-hole 14-PDIP package, which increases board size and limits integration with low-power microcontrollers. In portable or energy-constrained designs, this can significantly reduce battery life. Additionally, the lack of a sleep or shutdown mode prevents power cycling without external circuitry. For battery operation, consider alternatives like the LMC6772 with rail-to-rail operation and lower power draw, or redesign around current-sense frequency converters with digital outputs to interface directly with low-power ADCs or MCUs.
Can the LM2907N be used as a reliable replacement for the LM2907N/NOPB in new designs given its obso
While the LM2907N is functionally identical to the LM2907N/NOPB and can serve as a drop-in replacement in existing designs, it is not recommended for new designs due to its obsolete status and RoHS non-compliance. Using the LM2907N introduces supply chain risks and potential regulatory issues in markets requiring RoHS compliance. For new designs, consider upgrading to RoHS-compliant alternatives like the LM2907S/NOPB or redesigning with modern frequency-to-voltage converters such as the LTC1799, ensuring long-term availability and compliance. If you must use the LM2907N, secure a sufficient lifetime buy and verify end-market regulatory requirements.
What are the key design-in risks when integrating the LM2907N in a high-noise automotive environment
Integrating the LM2907N in automotive applications poses risks due to its sensitivity to power supply noise and lack of built-in EMI filtering. Although commonly used in tachometer circuits, the LM2907N's analog comparator and charge pump are susceptible to voltage transients common in 12V systems. Mitigate risks by adding a dedicated LC filter on Vcc, using a low-ESR bypass capacitor close to the supply pin, and shielding the input signal with a Schmitt trigger buffer. Ensure the pull-up capacitor (C1) and timing resistor (R1) are located near the IC to minimize parasitic pickup that could distort frequency response.
How does the ±0.3% linearity of the LM2907N perform across temperature in precision measurement appl
The LM2907N's specified ±0.3% linearity is typically measured at room temperature and can degrade over industrial temperature ranges (-40°C to +85°C), especially in high-humidity environments. In precision applications like engine speed monitoring, this drift may introduce significant calibration errors. Designers should characterize linearity across the full operating range and include temperature compensation in firmware if used with a microcontroller. Consider calibrating at multiple frequencies during system test to maintain accuracy, or evaluate more stable alternatives like the TC9400 for critical applications requiring tighter linearity over temperature.
What are the main integration challenges when replacing a LM555-based frequency-to-voltage circuit w
Replacing a LM555-based F-V converter with the LM2907N improves accuracy and reduces component count, but introduces new design constraints. The LM2907N requires precise selection of the timing capacitor (C1) and resistor (R2) to set full-scale output, and improper values can lead to frequency clipping or poor low-end response. Unlike the LM555, the LM2907N's output is current-sourced and requires an external pull-up resistor and filtering capacitor. Designers must also ensure input signal amplitude meets the internal Schmitt trigger thresholds (typically 1.4V min), which may require signal conditioning if driving from low-level sensors.
Is the LM2907N suitable for use in battery-powered systems considering its power consumption and pac
The LM2907N is not ideal for battery-powered systems due to its relatively high quiescent current (around 6 mA typical) and through-hole 14-PDIP package, which increases board size and limits integration with low-power microcontrollers. In portable or energy-constrained designs, this can significantly reduce battery life. Additionally, the lack of a sleep or shutdown mode prevents power cycling without external circuitry. For battery operation, consider alternatives like the LMC6772 with rail-to-rail operation and lower power draw, or redesign around current-sense frequency converters with digital outputs to interface directly with low-power ADCs or MCUs.
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Sep 15 2026
