TP5554-TR

Overview

The TP5554-TR is a quad chopper-stabilized zero-drift operational amplifier from the TP555X family, manufactured by 3PEAK. It features ultra-low noise characteristics with no 1/f noise corner down to 0.1 Hz and an input voltage noise density of 15 nV/√Hz at 1 kHz. The device operates on a single supply voltage ranging from 1.8 V to 5.5 V or dual supplies up to ±2.75 V. Key electrical specifications include a maximum input offset voltage of 5 μV, a maximum offset drift of 0.05 μV/°C, and a unity-gain bandwidth of 3.5 MHz. Each channel consumes a typical quiescent current of 550 μA. The output provides rail-to-rail swing capability.

Feature Summary

• Chopper-stabilized architecture eliminates flicker noise and minimizes offset voltage drift over temperature and time.
• Rail-to-rail input and output operation maximizes dynamic range within the specified supply voltage limits.
• High common-mode rejection ratio (CMRR) and power supply rejection ratio (PSRR) ensure signal integrity in noisy environments.
• Integrated ESD protection diodes provide robustness against electrostatic discharge events.

Applications

• Medical instrumentation requiring high precision and low noise
• Temperature measurement systems utilizing thermistors or RTDs
• Precision current sensing circuits
• Low frequency ADC drivers demanding minimal drift
• Process control systems and precision voltage reference buffers

Procurement Notes

Verify the package type corresponds to TSSOP-14 for the -TR suffix. Confirm RoHS compliance and halogen-free status as defined by the manufacturer's green specification. Ensure design implementation accounts for potential residual ripple at the chopping frequency by incorporating appropriate post-filtering if necessary. Validate PCB layout practices regarding guard rings to mitigate surface leakage effects given the low input bias current specifications.

Selection Notes

Select this component when application requirements demand extremely low offset voltage and near-zero drift without the penalty of high 1/f noise. It is suitable for DC and low-frequency applications where standard amplifiers would exhibit significant drift. Consider the trade-off between the 3.5 MHz bandwidth and the ultra-low noise performance. Ensure the source impedance is balanced across inputs to minimize offset current errors induced by charge injection.

Part Context

The TP5554-TR belongs to the TP555X series of zero-drift op-amps, which includes single (TP5551), dual (TP5552), and quad (TP5554) configurations. This family utilizes an auto-calibration technique with a time-continuous op-amp in the signal path. The -TR suffix indicates the device is supplied in tape and reel packaging, specifically designed for automated surface-mount assembly processes.

Replacement Considerations

Direct substitutes within the same family include TP5554-SR, which offers identical electrical characteristics but utilizes SOP-14 packaging instead of TSSOP-14. Designers must verify pin compatibility and thermal resistance differences between the two packages before substitution.

FAQ

How does the chopper stabilization affect low-frequency noise?

The chopper stabilization technique significantly reduces flicker noise, ensuring there is no 1/f noise corner down to 0.1 Hz. This results in lower noise at DC and low frequencies compared to standard low-noise amplifiers.

What precautions are needed for high source impedance applications?

Due to charge injection currents from the chopper switches, high input impedance can cause an apparent shift in input bias current. It is recommended to balance the input impedance across the IN+ and IN- terminals to minimize total input offset current.

Is external filtering required due to the chopping technique?

While internal notch filters suppress residual voltage ripple, higher noise spectra may exist at the chopping frequency and its harmonics. If the input signal frequency is near the chopping frequency, placing a post-filter at the output is recommended to further suppress noise.