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Texas Instruments TLC2654CN
- Part No.:
- TLC2654CN
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
TLC2654CN.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 14DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,605
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Product details
Overview
TLC2654CN from Texas Instruments is a chopper-stabilized operational amplifier optimized for ultra-low-noise, high-precision DC signal conditioning. It delivers 0.5 µV peak-to-peak input noise (0–1 Hz), 10 kHz chopping frequency, and 10 µV max input offset voltage (TLC2654A grade), enabling accurate amplification of thermocouple and strain gauge outputs in single-supply industrial sensor interfaces.
For engineers reviewing the TLC2654CN datasheet, TLC2654CN pinout, TLC2654CN application, or TLC2654CN equivalent, key selection criteria include sub-microvolt offset stability (0.05 µV/°C), rail-to-rail common-mode input range (includes VDD–), and absence of clock noise below 10 kHz - critical for low-frequency precision measurement systems.
Technical Context
The TLC2654CN implements a high-frequency (10 kHz typ) chopper-stabilization architecture that continuously nulls input offset voltage against temperature drift, time aging, and supply variation. Its Advanced LinCMOS process enables CMOS-level input impedance (>1012 Ω) while maintaining robust ESD protection (2000 V HBM).
Unlike low-frequency choppers, its 10 kHz chopping eliminates intermodulation error up to 5 kHz and avoids aliasing in subsonic bandwidth applications. The device requires two external capacitors (CXA/CXB) for internal chopping control, with optional external clock access via CLK IN/CLK OUT pins in 14-pin and 20-pin packages - though the 8-pin D and plastic DIP (N) packages used for TLC2654CN omit those pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | 10 µV max (TLC2654A grade at 25°C); ensures minimal baseline error in precision DC gain stages. |
| Offset Tempco | 0.05 µV/°C max; guarantees stable calibration over industrial temperature range (0°C to 70°C). |
| Input Noise (0–1 Hz) | 0.5 µVPP typ; enables resolution of microvolt-level thermocouple signals without 1/f noise corruption. |
| Chopping Frequency | 10 kHz typ; places clock energy beyond audio band, eliminating audible artifacts and intermodulation distortion below 5 kHz. |
| CMRR / PSRR | 110 dB min each; rejects power supply ripple and common-mode interference in noisy industrial environments. |
| Supply Range | ±2.3 V to ±8 V; supports operation from low-voltage single-supply (e.g., +5 V with VDD– = GND) to dual-rail systems. |
| Gain-Bandwidth | 1.9 MHz typ; sufficient for closed-loop gains up to ~100× while preserving phase margin (48°) with 100 pF load. |
Pinout & Package
Package: Plastic Dual-In-Line (PDIP-8), also designated N package per TI documentation. Body dimensions: 9.27 mm × 6.35 mm × 3.3 mm. RoHS-compliant lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CXA) | Chopper capacitor A terminal | Connects to external timing capacitor; sets chopping frequency and stabilizes nulling loop. |
| 2 (IN–) | Inverting input | Differential input node; high-impedance CMOS input (IIB ≤ 60 pA) minimizes bias current errors. |
| 3 (IN+) | Non-inverting input | Differential input node; common-mode range extends to VDD–, enabling true single-supply sensor interfacing. |
| 4 (VDD–) | Negative supply rail | Reference for internal chopping circuitry; allows rail-to-rail input operation when tied to system ground. |
| 5 (CXB) | Chopper capacitor B terminal | Completes chopper capacitor pair; must match CXA capacitor value for optimal offset cancellation. |
| 6 (VDD+) | Positive supply rail | Power supply input; supports ±2.3 V to ±8 V operation; internal regulation ensures stable core bias. |
| 7 (OUT) | Amplifier output | Class AB output stage; drives ≥10 kΩ loads with ±4.7 V swing (±5 V supplies); includes clamp pin for fast overload recovery. |
| 8 (CLAMP) | Output clamp control | Sinks 25 µA when active; reduces recovery time after saturation by limiting internal node excursion. |
Key Features
| Feature | Design Value |
|---|---|
| Noise performance | 0.5 µVPP (0–1 Hz) and 13 nV/√Hz (1 kHz) enable high-resolution DC measurements without external filtering. |
| DC precision | 10 µV max VIO and 0.05 µV/°C tempco ensure stable calibration across temperature in weigh-scale and medical instrumentation. |
| Rail-to-rail input | Common-mode range includes VDD–, allowing direct connection of grounded-sensor bridges and thermocouples in single-supply systems. |
| Robust fault tolerance | Withstands –100 mA surge currents and incorporates 2000 V HBM ESD protection - suitable for factory-floor sensor nodes. |
| Chopper transparency | On-chip chopping control requires no external clock; user-configurable clock interface available only on larger packages (not TLC2654CN). |
Applications
| Thermocouple Amplifier | Strain Gauge Signal Chain |
|---|---|
Use Scenario: Amplifying µV-level Seebeck voltages from Type-K thermocouples in HVAC controllers and industrial ovens. IC Role / Device Role / Timing Role: Primary DC-coupled gain stage with chopper stabilization to suppress thermal EMF drift and 1/f noise. Use Value: Enables <1°C measurement accuracy over 0–100°C range without manual recalibration, leveraging 0.05 µV/°C offset stability. | Use Scenario: Conditioning mV-output Wheatstone bridge signals from load cells in precision weighing systems. IC Role / Device Role / Timing Role: Low-noise, high-PSRR instrumentation amplifier front-end with rail-to-rail input for unipolar bridge excitation. Use Value: Delivers 16-bit-equivalent resolution (0.5 µVPP noise floor) without external auto-zero circuitry or complex layout shielding. |
| Medical ECG Front-End | Subsonic Data Acquisition |
Use Scenario: Biopotential amplification in portable ECG monitors requiring high CMRR and low electrode offset sensitivity. IC Role / Device Role / Timing Role: First-stage AC/DC-coupled amplifier with integrated clamp to recover from pacemaker pulse saturation. Use Value: CLAMP pin reduces overload recovery to <10 µs, preventing waveform clipping during transient events - critical for diagnostic fidelity. | Use Scenario: Seismic sensor readout and structural health monitoring where signals reside below 5 Hz with high dynamic range. IC Role / Device Role / Timing Role: Ultra-low-drift, low-noise transducer interface with no intermodulation error below 5 kHz. Use Value: Eliminates aliasing artifacts in digitized waveforms, ensuring faithful representation of slow mechanical vibrations without post-processing correction. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar chopper-stabilized op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2189IDR | Zero-drift architecture with 5.2 nV/√Hz noise (1 kHz), lower quiescent current (0.42 mA), but no CLAMP pin or chopper-capacitor interface. | Better suited for battery-powered precision ADC drivers; lacks fast overload recovery and external capacitor tuning. | Select OPA2189IDR when low power and modern zero-drift simplicity outweigh need for chopper-frequency optimization and clamp-assisted recovery. |
| LTC2057HMS8#PBF | Higher offset spec (5 µV max), wider supply range (±1.65 V to ±5.5 V), integrated EMI filtering, but no CLAMP pin and higher 1/f noise corner (~0.1 Hz). | Preferred for space-constrained, EMI-heavy environments (e.g., automotive body control); less ideal for ultra-low-noise sub-Hz applications. | Choose LTC2057HMS8#PBF when EMI immunity and compact MSOP-8 packaging are prioritized over absolute lowest 0–1 Hz noise and active clamp functionality. |
Compared with OPA2189IDR and LTC2057HMS8#PBF, the TLC2654CN uniquely combines sub-µVPP 0–1 Hz noise, user-accessible chopper capacitor terminals for frequency tuning, and a dedicated CLAMP pin - making it irreplaceable for legacy or cost-sensitive industrial systems demanding proven, field-hardened chopper performance.
Availability
TLC2654CN is available at Aetrix Electronics and suitable for thermocouple amplification, strain gauge signal conditioning, and medical biopotential acquisition requiring stable component supply across extended product lifecycles.
Supply support for TLC2654CN includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and digital signal technologies with over 90 years of innovation in precision analog ICs.
The TLC2654CN belongs to TI's Advanced LinCMOS™ chopper-stabilized op-amp family, designed specifically for high-accuracy, low-drift DC signal conditioning in industrial, medical, and test equipment where long-term calibration stability is mandatory.
FAQ
What is the maximum operating temperature range for the TLC2654CN?
The TLC2654CN is rated for operation from 0°C to 70°C (C-suffix). This commercial-grade temperature range is validated per TI's SLOS020G datasheet and applies to all electrical specifications unless otherwise noted. The device uses plastic DIP (N) packaging, which is not qualified for extended industrial or automotive ranges - those require I-, Q-, or M-suffix variants like TLC2654IN or TLC2654AMN.
Does the TLC2654CN require external clocking components?
No, the TLC2654CN does not require external clocking components. Its internal chopper-control circuitry operates autonomously using the CXA and CXB pins connected to external capacitors only - no external clock source, crystal, or oscillator is needed. Unlike 14-pin or 20-pin variants (e.g., TLC2654AC-14D), the 8-pin PDIP (N) package of TLC2654CN omits CLK IN and CLK OUT pins, making it a fully self-contained chopper solution.
How does the CLAMP pin on the TLC2654CN improve system performance?
The CLAMP pin on the TLC2654CN sinks 25 µA when activated, limiting internal node voltage excursion during output saturation. This reduces overload recovery time significantly - critical in applications like ECG front-ends or overload-prone sensor interfaces. In practice, this feature enables faster return to linear operation after large transient inputs, preserving signal integrity without requiring external clamping diodes or complex compensation networks.
Can the TLC2654CN operate from a single +5-V supply?
Yes, the TLC2654CN supports true single-supply operation. With VDD+ = +5 V and VDD– = 0 V (GND), its common-mode input voltage range extends from 0 V to +2.7 V, and output swings from ~0.3 V to ~4.7 V under 10-kΩ load. This rail-to-rail input capability - combined with chopper stabilization - makes it ideal for interfacing grounded sensors (e.g., thermocouples referenced to system ground) without level-shifting circuitry.
What are the recommended external capacitor values for CXA and CXB on the TLC2654CN?
Texas Instruments specifies 0.1 µF ceramic capacitors for both CXA and CXB pins in standard configurations, as confirmed in the SLOS020G datasheet Figure 1 and application guidance. These values set the nominal 10 kHz chopping frequency and ensure stable nulling loop behavior. Capacitor tolerance should be ±10% or better; X7R dielectric is preferred for temperature stability. Deviations alter chopping frequency and may degrade DC precision or increase residual ripple.
TLC2654CN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- LinCMOS™
- Package/Case:
- 14-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 3.7V/µs
- Gain Bandwidth Product:
- 1.9 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 50 pA
- Voltage - Input Offset:
- 5 µV
- Current - Supply:
- 1.5mA
- Current - Output / Channel:
- 50 mA
- Voltage - Supply Span (Min):
- 4.6 V
- Voltage - Supply Span (Max):
- 16 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 14-PDIP
TLC2654CN FAQ
1.How can I place an order for TLC2654CN through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC2654CN on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for TLC2654CN reliable?
The price and inventory of TLC2654CN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC2654CN is usually 5 days.
3.What payment methods are accepted for TLC2654CN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC2654CN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC2654CN?
TLC2654CN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC2654CN order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for TLC2654CN?
For technical support, including TLC2654CN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC2654CN requirements.
6.How does Aetrix verify that TLC2654CN is sourced from the original manufacturer or authorized distributors?
All TLC2654CN products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TLC2654CN meets industry standards.
7.What is the process for return or replacement of TLC2654CN?
All TLC2654CN units undergo pre-shipment inspection (PSI). If there is an issue with TLC2654CN, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The TLC2654CN part is unused and in its original packaging.
Return procedure for TLC2654CN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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