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Analog Devices Inc. LTC2055CDD#PBF
- Part No.:
- LTC2055CDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC2055CDD#PBF.pdf
- Description:
- IC OPAMP ZERO-DRIFT 2 CIRC 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,857
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Product details
Overview
LTC2055CDD#PBF from Analog Devices (formerly Linear Technology) is a dual, micropower, zero-drift operational amplifier in an 8-lead 3mm × 3mm DFN package. It delivers 3μV max input offset voltage, 30nV/°C max drift, 130μA per amplifier supply current, and rail-to-rail output swing - enabling precision DC-coupled signal conditioning in battery-powered medical sensors and industrial instrumentation.
For engineers reviewing the LTC2055CDD#PBF datasheet, LTC2055CDD#PBF pinout, LTC2055CDD#PBF application, or LTC2055CDD#PBF equivalent, key selection criteria include guaranteed 0°C to 70°C operation, DFN thermal performance (θJA = 160°C/W), low-frequency noise (1.6μVP-P, 0.01Hz–10Hz), and dual-amplifier channel isolation for differential bridge interfaces.
Technical Context
The LTC2055CDD#PBF uses auto-zeroing architecture with a 1kHz internal clock to continuously correct input offset and drift, achieving near-zero DC error over temperature and common-mode voltage. Its input stage supports rail-to-rail common-mode range (V– to V+ – 0.5V) and features 1pA typical input bias current at 25°C.
It provides 140dB typical open-loop gain, 130dB PSRR and CMRR, 500kHz gain-bandwidth product, and 0.5V/μs slew rate - balancing precision, speed, and power efficiency for sensor front-ends where DC accuracy dominates AC response requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7V to 6V single supply - supports 3.3V and 5V systems without level-shifting. |
| Input Offset Voltage (Max) | ±3μV over –40°C to 85°C - enables sub-10μV system-level DC error in precision transducer interfaces. |
| Offset Drift (Max) | ±30nV/°C - ensures <1μV total drift across 0°C to 70°C operating range. |
| Supply Current per Amp | 130μA (typ), 150μA (max) - allows two-channel operation under 300μA total, critical for multi-day battery life. |
| Input Noise (0.01–10Hz) | 1.6μVP-P - suitable for thermocouple, strain gauge, and high-resolution ADC driver applications. |
| Output Swing | Rail-to-rail (e.g., 2.98V high / 3mV low at 3V supply, RL = 100kΩ) - maximizes dynamic range into low-voltage ADCs. |
| Gain-Bandwidth Product | 500kHz - sufficient for anti-alias filtering and closed-loop gains up to ~100 without stability issues. |
Pinout & Package
Package: 8-lead plastic DFN (3mm × 3mm × 0.8mm), exposed pad internally connected to V–; θJA = 160°C/W with minimal PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: OUT A | Amplifier A output | Capable of sourcing/sinking ±20mA; rail-to-rail swing minimizes headroom loss in single-supply designs. |
| 2: –IN A | Inverting input A | High-impedance node (1pA bias current); sensitive to layout-induced leakage and clock feedthrough. |
| 3: +IN A | Non-inverting input A | Matches –IN A in offset and drift; requires matched trace lengths and guard rings for optimal CMRR. |
| 4: V– | Negative supply / ground reference | Internally connects to exposed thermal pad; must be soldered to PCB ground plane for thermal and noise performance. |
| 5: V+ | Positive supply | Accepts 2.7–6V; PSRR >120dB reduces sensitivity to supply ripple in noisy environments. |
| 6: OUT B | Amplifier B output | Independent channel; enables differential drive, I/V conversion with matched gain, or dual-sensor conditioning. |
| 7: –IN B | Inverting input B | Electrically isolated from Channel A; supports fully independent signal paths with no crosstalk. |
| 8: +IN B | Non-inverting input B | Same DC specs as +IN A; allows true differential amplification when paired with external resistors. |
Key Features
| Feature | Design Value |
|---|---|
| Zero-drift auto-zeroing | Eliminates thermal drift and 1/f noise accumulation, maintaining <3μV offset across full temperature range. |
| Rail-to-rail output | Delivers full supply voltage swing (e.g., 0.003V to 2.997V at 3V), maximizing SNR into 16-bit+ ADCs. |
| Ultra-low input bias current | 1pA typical at 25°C enables high-impedance sensor interfaces (e.g., pH electrodes, piezoresistive bridges) without significant error. |
| High PSRR and CMRR | 130dB typical rejection of supply noise and common-mode interference improves measurement integrity in electrically noisy industrial settings. |
| DFN thermal performance | 160°C/W θJA with standard layout allows continuous operation at 70°C ambient without derating. |
Applications
| Thermocouple Amplification | Electronic Scale Load Cell Interface |
|---|---|
Use Scenario: Amplifying microvolt-level Seebeck voltage from Type-K thermocouples in HVAC controllers and process monitoring. IC Role / Device Role / Timing Role: Dual-channel precision instrumentation amplifier front-end, with one amp for cold-junction compensation and one for signal gain. Use Value: 3μV offset and 30nV/°C drift ensure <±0.5°C absolute accuracy over 0–70°C without calibration. | Use Scenario: Conditioning mV-level Wheatstone bridge outputs from strain-gauge-based weight platforms in retail scales and industrial weigh modules. IC Role / Device Role / Timing Role: Dual-op-amp difference amplifier with matched gain-setting resistors for ratiometric bridge excitation and output scaling. Use Value: Rail-to-rail output swing preserves full 16-bit ADC resolution; 1.6μVP-P noise enables <10mg resolution on 30kg load cells. |
| Medical ECG Front-End | Battery-Powered Data Logger |
Use Scenario: Low-noise, low-power amplification of 0.5–2mV cardiac signals in portable ECG monitors with 24-hour battery life. IC Role / Device Role / Timing Role: First-stage gain and filtering amplifier with active guarding and right-leg drive support via dual channels. Use Value: 130μA per amplifier enables dual-channel analog front-end under 300μA, extending coin-cell battery life while maintaining diagnostic-grade DC accuracy. | Use Scenario: Signal conditioning for environmental sensors (temperature, humidity, gas) in remote IoT nodes powered by Li-SOCl₂ batteries. IC Role / Device Role / Timing Role: Precision buffer and level-shifter for interfacing analog sensors to ultra-low-power SAR ADCs in sleep/wake architectures. Use Value: 2.7V minimum supply and rail-to-rail output allow direct interface to 3V ADCs; zero-drift eliminates baseline drift during long-term unattended logging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual zero-drift op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8629ARZ | Single-supply range 2.7–5V; 1μV max offset; 250μA per amp supply current; SOIC-8 package. | Higher quiescent current limits battery life; larger SOIC footprint increases board area vs. DFN. | Choose AD8629ARZ only if SOIC handling or legacy layout compatibility outweighs size/power penalties. |
| LTC2055IDD#PBF | Identical DFN package and pinout; extended –40°C to 85°C temperature grade; same electrical specs. | Required for industrial environments with wider ambient swings; no design change needed beyond qualification testing. | Select LTC2055IDD#PBF when operating outside 0–70°C range - drop-in replacement with identical layout and schematic. |
Compared with AD8629ARZ, LTC2055CDD#PBF offers 57% lower supply current and 30% smaller footprint; versus LTC2055IDD#PBF, it trades extended temperature capability for cost and qualification simplicity in commercial-grade applications.
Availability
LTC2055CDD#PBF is available at Aetrix Electronics and suitable for thermocouple amplifiers, electronic scales, medical instrumentation, and battery-powered data loggers requiring stable component supply across commercial temperature ranges.
Supply support for LTC2055CDD#PBF 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
Analog Devices acquired Linear Technology in 2017 and maintains its precision analog portfolio, renowned for low-noise, low-drift, and high-reliability signal conditioning ICs.
The LTC2055CDD#PBF belongs to Linear's zero-drift op amp family, designed specifically for DC-accurate sensor signal chains in medical, industrial, and test equipment where long-term stability and microvolt-level precision are mandatory.
FAQ
What is the maximum operating temperature for the LTC2055CDD#PBF?
The LTC2055CDD#PBF is specified for 0°C to 70°C ambient operation. Its DFN package has a junction-to-ambient thermal resistance (θJA) of 160°C/W with minimal PCB copper; actual junction temperature must remain ≤125°C. Derating is required above 70°C ambient unless enhanced thermal layout is implemented.
Does the LTC2055CDD#PBF require external capacitors for stability?
No, the LTC2055CDD#PBF is unity-gain stable and does not require external compensation capacitors. However, a 0.1μF ceramic capacitor between V+ and V– pins is recommended close to the device for supply decoupling, especially in noisy environments or when driving capacitive loads.
Can the LTC2055CDD#PBF drive ADC inputs directly?
Yes, the LTC2055CDD#PBF can directly drive SAR and delta-sigma ADCs with rail-to-rail output swing (e.g., 0.003V to 2.997V at 3V supply) and low output impedance (<1Ω). For 16-bit+ resolution, use a 10Ω series resistor and 1nF capacitor at the ADC input to limit charge kickback and settling time.
How does clock feedthrough affect the LTC2055CDD#PBF in precision applications?
The LTC2055CDD#PBF uses a 1kHz auto-zeroing clock, producing <0.2μVRMS input-referred feedthrough. In DC-critical applications, this appears as a small 1kHz tone in the output spectrum. Use low-source-impedance inputs (<10kΩ) and feedback capacitors to suppress feedthrough without compromising bandwidth.
Is the exposed pad on the LTC2055CDD#PBF package required to connect to ground?
Yes, the underside metal pad of the LTC2055CDD#PBF DFN package is internally connected to V–. It must be soldered to a PCB ground plane for thermal dissipation (reducing θJA), noise reduction, and mechanical reliability. Omitting this connection degrades thermal performance and may cause instability or increased offset drift.
LTC2055CDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Zero-Drift
- Number of Circuits:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.5V/µs
- Gain Bandwidth Product:
- 500 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 1 pA
- Voltage - Input Offset:
- 0.5 µV
- Current - Supply:
- 130µA (x2 Channels)
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 11 V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x3)
LTC2055CDD#PBF FAQ
1.How can I place an order for LTC2055CDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2055CDD#PBF 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 LTC2055CDD#PBF reliable?
The price and inventory of LTC2055CDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2055CDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC2055CDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2055CDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2055CDD#PBF?
LTC2055CDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2055CDD#PBF 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 LTC2055CDD#PBF?
For technical support, including LTC2055CDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2055CDD#PBF requirements.
6.How does Aetrix verify that LTC2055CDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2055CDD#PBF 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 LTC2055CDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC2055CDD#PBF?
All LTC2055CDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2055CDD#PBF, 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 LTC2055CDD#PBF part is unused and in its original packaging.
Return procedure for LTC2055CDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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