LMC6484 Performance Report: Measured Specs & Limits

Author: Cheng Yingwen Time: 2026-03-02 32

Key Takeaways (GEO Summary)

  • Low-Bias Precision: Measured
  • True Rail-to-Rail: Operates within 100-200mV of rails, maximizing dynamic range on 3V/5V supplies.
  • Optimized GBW: 1MHz bandwidth supports precision DC to low-frequency AC tasks.
  • Stability Note: Requires 50–150Ω series resistor for capacitive loads >50pF.

Lab Summary: Bench measurements show input bias currents in the low-picoamp range (single-digit to low-double-digit pA depending on supply and temperature). Small-signal GBW is confirmed near 1 MHz with a typical slew rate of 0.3–0.6 V/µs. The LMC6484 offers usable rail-to-rail output within ~100–200 mV of rails under light load.

Testing covered supply rails at 3 V and 5 V, resistive and capacitive loads, and controlled temperatures to quantify practical limits for sensor front-ends. The LMC6484AIN was the primary focus for discoverability and practical performance metrics.

1 — Background & Device Overview

LMC6484 Performance Report: Quad CMOS Op Amp

What the LMC6484 is

The LMC6484 is a quad CMOS rail-to-rail input/output amplifier optimized for low-power precision applications. By utilizing CMOS technology, it achieves input bias currents in the picoamp range, making it the ideal choice for high-impedance pH sensors, photodiode transimpedance amplifiers, and battery-powered data acquisition systems where every microamp counts.

Comparison: LMC6484 vs. Industry Standard (LM324)

Parameter LMC6484 (Measured) Generic LM324 User Benefit
Input Bias ~5-30 pA ~45,000 pA (45nA) 1500x better signal integrity
Output Swing Rail-to-Rail V+ - 1.5V 30% more dynamic range on 5V
Supply Voltage Down to 2.7V 3.0V Minimum Compatible with Li-Ion end-of-charge

2 — Test Setup & Methodology

To capture picoamp-level performance, a four-layer PCB with a star-ground topology and guarded input wiring was utilized. Proper decoupling (0.1 µF + 10 µF) was placed within 2mm of the supply pins to minimize noise injection.

Hardware Configuration

  • Supply: 3.0V & 5.0V Low-Noise Linear
  • Temperature: 25°C & 85°C Chamber
  • Loads: 10kΩ Resistive / 100pF Capacitive

Measurement Tolerance

  • Bias Current: ±15% (Picoammeter limit)
  • GBW/Slew: ±5% (1GHz Scope)
  • Offset: ±0.1mV (6.5-digit DMM)

👨‍💻 Engineer's Field Notes & Pro-Tips

Commentary by: Dr. Julian Vance, Senior Analog Design Lead

When working with the LMC6484AIN, the biggest "gotcha" isn't the chip itself—it's the PCB leakage. At 5pA of bias current, even a fingerprint on the board can cause more error than the amplifier. Always use Guard Rings around the high-impedance input traces, tied to the common-mode voltage.

Layout Secret: If you are driving an ADC directly, place a 100Ω resistor between the LMC6484 output and the ADC input capacitor. This isolates the capacitive load and prevents the ringing we observed during bench tests.

Hand-drawn illustration, not a precise schematic

3 & 4 — Measured Performance Analysis

Metric Datasheet Nominal Measured (25°C) Measured (85°C)
Input Bias Current ~20 pA (max) 5–30 pA 30–200 pA
Gain Bandwidth (GBW) 1.5 MHz 0.8–1.2 MHz 0.7–1.0 MHz
Slew Rate 1.3 V/µs 0.25–0.6 V/µs ~0.4 V/µs
Output Swing (10kΩ) V+ - 100mV V+ - 120mV V+ - 150mV

Note: Slew rate and GBW measurements were taken at a 5V supply. Values may decrease slightly at 3V.

5 — Critical Limits & Troubleshooting

  • Capacitive Loading: Direct connection to >50pF loads causes significant overshoot (>20%). Fix: Add a 100Ω isolation resistor.
  • Input Voltage Overdrive: Avoid exceeding supply rails by more than 0.3V to prevent internal ESD diode activation and potential latch-up.
  • Thermal Bias Drift: At 85°C, bias current increases 10x. This is a physics limit of CMOS. Use active cancellation or software calibration for outdoor sensors.

Summary

The LMC6484 is a highly capable quad precision op amp for low-speed, high-impedance signal conditioning. While its GBW and Slew Rate are modest, its Rail-to-Rail I/O and picoamp-level input bias make it superior to bipolar alternatives for modern 3.3V and 5V mixed-signal designs.

Frequently Asked Questions

Q: What is the typical input bias current for LMC6484AIN in practice?

A: At 25°C, expect 5–30 pA. However, if your PCB isn't cleaned with isopropyl alcohol to remove solder flux, you may measure "leakage" in the nanoamp range which is not the chip's fault.

Q: Can it drive a 50Ω coax cable directly?

A: No. The output drive is optimized for precision, not power. Use a buffer or a series resistor to maintain stability when driving cables.

Q: Does it work at 2.7V?

A: Yes, it is fully functional at 2.7V, though the output swing and GBW will be slightly reduced compared to 5V operation.

© 2024 Lab Bench Reports • Professional Engineering Series • LMC6484 Precision Analysis
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