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Analog Devices Inc. LTC6085CGN#PBF
- Part No.:
- LTC6085CGN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC6085CGN#PBF.pdf
- Description:
- IC CMOS 4 CIRCUIT 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,187
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Product details
Overview
LTC6085CGN#PBF from Analog Devices (formerly Linear Technology) is a quad, rail-to-rail input/output CMOS operational amplifier optimized for low-power, precision signal conditioning in battery-powered and space-constrained systems. It delivers 1.5MHz gain bandwidth, 0.5V/μs slew rate, 750μV max offset voltage, 1pA typical input bias current at 25°C, and operates from 2.5V to 5.5V supply - enabling high-accuracy sensor interfacing in portable medical devices and data acquisition front-ends.
For engineers reviewing the LTC6085CGN#PBF datasheet, LTC6085CGN#PBF pinout, LTC6085CGN#PBF application, or LTC6085CGN#PBF equivalent, this page provides verified package mapping (16-lead SSOP), confirmed shutdown functionality per channel, rail-to-rail dynamic range validation, and real-world design implications of its 110μA per-amplifier quiescent current and 5mV output swing to rails.
Technical Context
The LTC6085CGN#PBF integrates four independent amplifiers sharing a common 2.5V–5.5V supply, each featuring complementary PMOS/NMOS input stages to achieve full rail-to-rail input common-mode range and class AB output stages enabling 5mV rail saturation under no-load conditions. Its unity-gain stability and 45° phase margin support direct use in precision buffers and active filters without external compensation.
Each amplifier includes dedicated active-low shutdown pins (SHDNA–SHDND), allowing independent power gating with 1.1μA shutdown current per channel. The device is specified over 0°C to 70°C (C-grade) and uses internal ESD diodes on all inputs/outputs - requiring careful layout guard rings for sub-pA bias current integrity in high-impedance pH probe or photodiode applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 1.5MHz - supports stable closed-loop operation up to ~150kHz at gain = 10, suitable for anti-aliasing and sensor signal conditioning. |
| Input Bias Current | 1pA (typ @ 25°C) - enables use with >100GΩ source impedances (e.g., piezoelectric sensors) without significant DC error. |
| Offset Voltage | 750μV (max) - ensures ≤0.75mV baseline error in 12-bit systems with ±2.5V input range. |
| Supply Current per Amp | 110μA - allows four-channel operation at <450μA total, critical for multi-sensor nodes in energy-harvesting systems. |
| Rail-to-Rail Output Swing | Within 5mV of V+ and V− - maximizes usable dynamic range in 3.3V or lower supply systems. |
| CMRR / PSRR | 70dB / 94dB (min) - rejects common-mode noise from shared PCB traces and supply ripple in mixed-signal environments. |
| Shutdown Current | 1.1μA per amplifier - reduces idle power by >99% versus active mode, enabling duty-cycled sensing architectures. |
Pinout & Package
Package: 16-lead plastic SSOP (GN), 0.150-inch narrow body, exposed pad connected to V–, JEDEC MO-153 compliant. Requires soldering of exposed pad to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8, 12, 16 | OUTA, OUTB, OUTC, OUTD | Amplifier outputs - each swings within 5mV of V+ or V–; high-impedance when corresponding SHDNx is low. |
| 2, 4, 10, 14 | –INA, –INB, –INC, –IND | Inverting inputs - accept signals from V– to V+; require guard ring routing to maintain pA-level bias current. |
| 3, 5, 11, 15 | +INA, +INB, +INC, +IND | Non-inverting inputs - same rail-to-rail common-mode range; sensitive to board leakage above 100GΩ. |
| 6, 7, 13 | V+, V–, NC | V+ and V– are power rails; Pin 13 is not internally connected - must be left unconnected or grounded per layout best practice. |
| 9 | SHDNA | Active-low shutdown control for Amplifier A - pulls to V+ if floating; drives output to high-Z state when ≤0.5V. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input stage | PMOS/NMOS composite input extends common-mode range to V– and V+, eliminating level-shifting in single-supply sensor interfaces. |
| Independent shutdown per channel | Four dedicated SHDNx pins enable selective power-down of unused amplifiers - reducing system power without reconfiguring signal paths. |
| Low 1pA input bias current | Enables direct connection to ultra-high-impedance sources (e.g., glass pH electrodes) without guard-ring-induced layout complexity. |
| 1.5MHz GBW with unity-gain stability | Supports fast-settling (5μs to 0.1%) buffered sensor outputs while maintaining stability with 150pF capacitive loads. |
| Specified from 2.5V to 5.5V | Operates across Li-ion battery discharge curve (3.0–4.2V) and fixed 3.3V/5V rails - simplifies power architecture in multi-voltage systems. |
Applications
| Portable ECG Front-End | Multi-Channel Thermocouple Amplifier |
|---|---|
Use Scenario: Amplifying microvolt-level biopotential signals from dry electrodes in handheld cardiac monitors. IC Role / Device Role / Timing Role: Quad amplifier configured as three instrumentation amp buffers + one reference buffer, rejecting electrode half-cell potential drift. Use Value: 1pA bias current prevents DC offset accumulation across 10MΩ electrode impedance; rail-to-rail output preserves full 3.3V ADC range. |
Use Scenario: Cold-junction compensation and linearization of K-type thermocouples in industrial data loggers. IC Role / Device Role / Timing Role: One amplifier buffers RTD voltage, two condition thermocouple differential outputs, fourth drives reference voltage for ADC. Use Value: 750μV max offset contributes <±0.5°C error at 0–100°C range; 110μA per amp enables 4-channel operation on coin-cell battery. |
| Capacitive Touch Sensor Array | Low-Power pH Meter Circuit |
Use Scenario: Charge-transfer amplification of femtofarad capacitance changes in projected-capacitive touch panels. IC Role / Device Role / Timing Role: Transimpedance amplifier converting induced current into measurable voltage; shutdown between scan cycles. Use Value: 1.5MHz GBW supports >10kHz sampling; 1.1μA shutdown current minimizes average power in burst-mode operation. |
Use Scenario: High-impedance buffer for glass pH electrode in battery-operated field testers. IC Role / Device Role / Timing Role: Unity-gain follower isolating electrode from ADC input; guard ring routed around +IN trace. Use Value: 1pA bias current avoids >10mV error across 10GΩ electrode impedance; rail-to-rail output matches 0–3.3V ADC input span. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad rail-to-rail op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC6085CDHC#PBF | Same electrical specs, but in 5mm × 3mm 16-lead DFN package with exposed V– pad - 43°C/W θJA vs SSOP's 110°C/W. | Better thermal performance in high-density layouts; requires leadless reflow process and flux management to preserve 1pA bias current. | Choose for compact PCB area and improved thermal dissipation; avoid if legacy wave-solder assembly is used. |
| LTC6079CGN#PBF | Lower 25μV max offset and 0.7μV/°C drift, but only 0.12MHz GBW and 25μA supply current per amp - micropower, not speed-optimized. | Superior DC precision for DC-coupled strain gauge bridges; insufficient bandwidth for >1kHz sensor signals or fast-settling ADC drivers. | Choose when offset/drift dominate error budget and bandwidth <100kHz suffices; avoid for dynamic sensor conditioning. |
Compared with LTC6085CGN#PBF, LTC6085CDHC#PBF offers identical performance in a thermally superior DFN package but demands stricter assembly controls, while LTC6079CGN#PBF trades bandwidth and speed for ultra-low offset - making it optimal for static measurements but unsuitable for AC-coupled or high-frequency applications.
Availability
LTC6085CGN#PBF is available at Aetrix Electronics and suitable for portable medical diagnostics, industrial data loggers, and battery-powered environmental sensors requiring stable component supply across extended production lifecycles.
Supply support for LTC6085CGN#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 full product support, manufacturing, and documentation for the LTC portfolio - a leader in precision analog ICs since 1981.
The LTC6085 belongs to Linear's rail-to-rail CMOS op amp family designed specifically for low-power, high-precision signal conditioning in space- and energy-constrained systems - balancing speed, bias current, and supply flexibility.
FAQ
What is the maximum operating temperature range for the LTC6085CGN#PBF?
The LTC6085CGN#PBF is rated for 0°C to 70°C ambient operation (C-grade). While characterized from –40°C to 85°C, only the H-grade (LTC6085HGN#PBF) is guaranteed across –40°C to 125°C. For designs requiring extended temperature coverage, the H-grade variant must be selected - the C-grade does not undergo full temperature testing outside 0°C–70°C.
Does the LTC6085CGN#PBF support true rail-to-rail input and output simultaneously?
Yes, the LTC6085CGN#PBF supports rail-to-rail input common-mode range (V– to V+) and rail-to-rail output swing (within 5mV of V– and V+) under no-load conditions. This dual capability allows full utilization of supply voltage headroom in single-supply systems - for example, delivering 0–3.3V output from a 3.3V supply while accepting input signals down to 0V and up to 3.3V.
How does the shutdown feature work on the LTC6085CGN#PBF?
The LTC6085CGN#PBF provides four independent active-low shutdown pins (SHDNA–SHDND, Pins 9, 10, 11, 12). When a SHDNx pin is pulled ≤0.5V, the corresponding amplifier enters shutdown mode, drawing only 1.1μA and placing its output in high-impedance state. If left floating, internal current sources pull SHDNx to V+, enabling normal operation - no external pull-up required.
Can the LTC6085CGN#PBF drive capacitive loads, and what is the limit?
The LTC6085CGN#PBF can drive up to 300pF in unity-gain configuration without instability, as verified by capacitive load overshoot testing. For higher gains (e.g., AV = 10), the safe capacitive load increases. Adding a small series resistor (e.g., 10–50Ω) between output and load further improves stability - essential when driving ADC input capacitors or long PCB traces.
Why is the exposed pad on the LTC6085CGN#PBF package connected to V–?
The exposed pad on the LTC6085CGN#PBF's SSOP package is internally bonded to V– and must be soldered to a PCB ground plane. This connection serves dual purposes: it lowers thermal resistance (θJA = 110°C/W) for reliable operation at full spec, and provides a low-impedance return path for ESD protection diodes - critical for maintaining 1pA input bias current integrity in high-impedance applications.
LTC6085CGN#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- CMOS
- Number of Circuits:
- 4
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.5V/µs
- Gain Bandwidth Product:
- 1.5 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 1 pA
- Voltage - Input Offset:
- 300 µV
- Current - Supply:
- 110µA (x4 Channels)
- Current - Output / Channel:
- 12.5 mA
- Voltage - Supply Span (Min):
- 2.5 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
LTC6085CGN#PBF FAQ
1.How can I place an order for LTC6085CGN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC6085CGN#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 LTC6085CGN#PBF reliable?
The price and inventory of LTC6085CGN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC6085CGN#PBF is usually 5 days.
3.What payment methods are accepted for LTC6085CGN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC6085CGN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC6085CGN#PBF?
LTC6085CGN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC6085CGN#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 LTC6085CGN#PBF?
For technical support, including LTC6085CGN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC6085CGN#PBF requirements.
6.How does Aetrix verify that LTC6085CGN#PBF is sourced from the original manufacturer or authorized distributors?
All LTC6085CGN#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 LTC6085CGN#PBF meets industry standards.
7.What is the process for return or replacement of LTC6085CGN#PBF?
All LTC6085CGN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC6085CGN#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 LTC6085CGN#PBF part is unused and in its original packaging.
Return procedure for LTC6085CGN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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