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Analog Devices Inc. LT1679CS#TRPBF
- Part No.:
- LT1679CS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1679CS#TRPBF.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:5,909
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Product details
Overview
LT1679CS#TRPBF from Analog Devices (formerly Linear Technology) is a quad rail-to-rail input/output precision operational amplifier optimized for low-noise, single-supply signal conditioning. It delivers 3.9nV/√Hz voltage noise at 1kHz, 100µV max input offset voltage, 20MHz gain bandwidth, and operates from 2.7V to 36V supply. It is used in battery-powered instrumentation amplifiers, strain gauge interfaces, and portable microphone preamplifiers where microvolt-level accuracy and wide dynamic range are critical.
For engineers reviewing the LT1679CS#TRPBF datasheet, LT1679CS#TRPBF pinout, LT1679CS#TRPBF application, or LT1679CS#TRPBF equivalent, key selection criteria include guaranteed rail-to-rail input beyond rails by 100mV, output swing within 170mV of either rail at 0.1mA load, matched amplifier performance across all four channels, and full –40°C to +85°C operation without phase inversion.
Technical Context
The LT1679CS#TRPBF employs dual complementary input stages (NPN and PNP) that automatically switch based on common-mode voltage to maintain rail-to-rail input operation without phase reversal. Its input stage operates at ~100µA per amplifier to achieve low voltage noise, while its unique collector-driven rail-to-rail output stage avoids emitter-follower voltage drops.
It supports true single-supply operation down to 2.7V with specified performance at ±15V, ±5V, and 3V supplies. Matching specifications-including offset voltage match (≤150µV), CMRR match (≥94dB), and PSRR match (≥96dB)-are explicitly defined between amplifier pairs A/D and B/C for instrumentation-grade applications like 2-op-amp INA designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 20MHz - enables stable unity-gain buffer and closed-loop gain ≥10 up to 2MHz with adequate phase margin. |
| Input Voltage Noise Density | 3.9nV/√Hz @ 1kHz - ensures minimal contribution to system noise floor in sensor front-ends with source impedances ≤400Ω. |
| Input Offset Voltage | 100µV max (–40°C to +85°C) - supports µV-level threshold detection and high-gain DC-coupled amplification without trimming. |
| Rail-to-Rail Input Range | –0.1V to VS + 0.1V - allows direct interfacing to sensors operating beyond supply rails, eliminating level-shifting circuitry. |
| Output Swing (0.1mA) | Within 170mV of either rail - delivers >95% of full-scale dynamic range in 3V or 5V systems with light loads. |
| Supply Voltage Range | 2.7V to 36V (±1.35V to ±18V) - supports both ultra-low-power portable devices and industrial ±15V signal chains. |
| Common-Mode Rejection | 100dB min - rejects power supply ripple and ground bounce in noisy mixed-signal PCB environments. |
Pinout & Package
LT1679CS#TRPBF is housed in a 14-lead plastic SO (Small Outline) package, 150-mil width, with standard JEDEC MS-012AC footprint and thermal resistance θJA = 160°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT A) | Amplifier A output | Drives external load; rail-to-rail swing supports single-supply signal chain integrity. |
| 2 (–IN A) | Inverting input A | Differential node for A channel; accepts signals up to VS + 0.1V or –0.1V. |
| 3 (+IN A) | Non-inverting input A | High-impedance sensing node; bias current ≤20nA minimizes error in high-Z sources. |
| 4 (V+) | Positive supply rail | Accepts 2.7V to 36V; decoupling capacitor required near pin for stability. |
| 5 (+IN B) | Non-inverting input B | Independent input for second amplifier; matches A channel for differential pair use. |
| 6 (–IN B) | Inverting input B | Matches A channel inputs for matched gain/offset in instrumentation topologies. |
| 7 (OUT B) | Amplifier B output | Electrically isolated from OUT A; enables dual-channel independent buffering. |
| 8 (OUT D) | Amplifier D output | Third output terminal; paired with –IN D/+IN D for fourth channel functionality. |
| 9 (–IN D) | Inverting input D | Part of D/C matching pair; ∆VOS ≤150µV vs C channel enables precision 4-op-amp INAs. |
| 10 (V–) | Negative supply rail | Ground reference in single-supply mode; accepts negative voltage down to –18V in dual-supply. |
| 11 (+IN C) | Non-inverting input C | Fourth amplifier non-inverting input; matches B channel for symmetrical design. |
| 12 (–IN C) | Inverting input C | Fourth amplifier inverting input; completes matched set with A/B/D for multi-stage filtering. |
| 13 (OUT C) | Amplifier C output | Final output; completes quad configuration-no shared internal nodes with other outputs. |
| 14 (NC) | No connect | Not internally bonded; must remain unconnected per datasheet to avoid parasitic coupling. |
Key Features
| Feature | Design Value |
|---|---|
| No phase inversion over full input range | Eliminates latch-up risk in servo loops and prevents distortion when input exceeds rails by 100mV. |
| Guaranteed rail-to-rail output swing | Delivers usable signal headroom within 170mV of V+ or V– at 0.1mA, enabling full utilization of ADC input range. |
| Matched amplifier parameters | Offset match ≤150µV and CMRR match ≥94dB allow two LT1679CS#TRPBF amplifiers to form a precision 2-op-amp INA. |
| Low 1/f noise corner | 4Hz corner frequency ensures stable DC-coupled performance in microvolt-threshold detection and slow-sensor applications. |
| Single-supply operation from 2.7V | Enables direct integration into Li-ion (3.0–4.2V) and coin-cell (3V) powered portable instrumentation. |
Applications
| Strain Gauge Amplifier | Portable Microphone Preamp |
|---|---|
Use Scenario: Wheatstone bridge output from metal foil or semiconductor strain gauges in structural health monitoring. IC Role / Device Role / Timing Role: First-stage instrumentation amplifier using two matched LT1679CS#TRPBF channels (A/B) for high CMRR and low drift. Use Value: 100µV max offset and 94dB CMRR match enable <1µε resolution without calibration in 3.3V systems. | Use Scenario: Low-noise preamplification of electret condenser microphone (ECM) output in handheld audio recorders. IC Role / Device Role / Timing Role: Single-supply, rail-to-rail I/V converter and gain stage with 3.9nV/√Hz noise floor. Use Value: 90nVP-P 0.1–10Hz noise preserves speech intelligibility and SNR >65dB(A) at 1kHz with 2kΩ source impedance. |
| Battery-Powered Rail-to-Rail INA | Infrared Detector Interface |
Use Scenario: Dual-supply instrumentation amplifier for thermopile or pyroelectric IR sensor in portable gas analyzers. IC Role / Device Role / Timing Role: Quad configuration: A/B as difference amp, C/D as output buffer and reference driver. Use Value: Matched ∆VOS ≤150µV and ∆CMRR ≥94dB ensure <0.01% gain error across temperature in 5V battery-powered designs. | Use Scenario: Transimpedance amplification of photodiode current from pulsed IR emitters in proximity sensors. IC Role / Device Role / Timing Role: High-speed TIA stage (GBW = 20MHz) with low input capacitance (4.2pF) and 0.3pA/√Hz current noise. Use Value: Enables 10ns pulse response and sub-picoamp sensitivity in 3.3V IoT motion detectors without external compensation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OP4177ARUZ | Lower noise (2.9nV/√Hz), higher precision (60µV max VOS), but no rail-to-rail input; requires dual supply for full-range operation. | Preferred in precision lab equipment where supply headroom exists and ultra-low offset dominates over rail-to-rail capability. | Select OP4177ARUZ only when input signal stays within ±12V of mid-supply and µV-level offset trumps input range flexibility. |
| TLV9064IPWR | Lower supply current (530µA/ch), rail-to-rail I/O, but higher noise (16nV/√Hz) and lower GBW (10MHz); rated only to +125°C. | Suitable for cost-sensitive, low-power industrial sensors where noise budget allows >10× degradation versus LT1679CS#TRPBF. | Choose TLV9064IPWR for battery life-critical designs with relaxed noise requirements and no need for sub-100nV/√Hz performance. |
Compared with OP4177ARUZ and TLV9064IPWR, the LT1679CS#TRPBF uniquely balances rail-to-rail input beyond supplies, 3.9nV/√Hz noise, and 20MHz bandwidth-making it irreplaceable in single-supply, wide-dynamic-range sensor front-ends where both headroom and fidelity are constrained.
Availability
LT1679CS#TRPBF is available at Aetrix Electronics and suitable for strain gauge amplifiers, portable microphone preamplifiers, battery-powered instrumentation amplifiers, and infrared detector interfaces requiring stable component supply across automotive, industrial, and medical OEM programs.
Supply support for LT1679CS#TRPBF 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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LT1679CS#TRPBF belongs to ADI's legacy Linear Technology precision op amp product line, engineered specifically for low-noise, rail-to-rail, single-supply signal conditioning in portable and battery-operated instrumentation systems.
FAQ
What is the maximum supply voltage rating for the LT1679CS#TRPBF?
The LT1679CS#TRPBF has an absolute maximum supply voltage rating of ±18V (36V total). It is fully specified for operation from ±1.35V to ±18V (or 2.7V to 36V single supply), with guaranteed performance across the full –40°C to +85°C temperature range at these extremes. Exceeding ±18V risks permanent damage per Absolute Maximum Ratings.
Does the LT1679CS#TRPBF support true rail-to-rail input beyond the supply rails?
Yes-the LT1679CS#TRPBF guarantees rail-to-rail input operation from –0.1V to V+ + 0.1V, meaning it accepts common-mode voltages 100mV beyond either supply rail without phase inversion or clipping. This is confirmed in the datasheet's "Rail-to-Rail Input" section and validated by the Simplified Schematic showing dual NPN/PNP input stage switching.
How is amplifier matching defined for the LT1679CS#TRPBF?
Matching for the LT1679CS#TRPBF is explicitly defined between amplifier pairs A/D and B/C per Note 15. Key matched parameters include offset voltage match (≤150µV max), CMRR match (≥94dB), and PSRR match (≥96dB), all tested over –40°C to +85°C. These values enable precise 2-op-amp instrumentation amplifier topologies without external trimming.
Can the LT1679CS#TRPBF drive capacitive loads without instability?
The LT1679CS#TRPBF is unity-gain stable but exhibits increasing overshoot with capacitive loads >100pF. The datasheet shows 10% overshoot at 100pF and >40% at 1000pF (Figure G18). For loads >100pF, add a series resistor (10–50Ω) between output and cap, or use the recommended 20–50pF feedback capacitor across RF to maintain phase margin above 45°.
What is the 0.1Hz to 10Hz input voltage noise specification for the LT1679CS#TRPBF?
The LT1679CS#TRPBF delivers 90nVP-P typical 0.1Hz to 10Hz input voltage noise when VCM = V+, and 180nVP-P when VCM = 0V (per page 3, Electrical Characteristics table). This low 1/f noise supports high-resolution DC measurements in applications such as microvolt-threshold detection and thermocouple amplification.
LT1679CS#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- LT®
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 4
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 6V/µs
- Gain Bandwidth Product:
- 20 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 2 nA
- Voltage - Input Offset:
- 20 µV
- Current - Supply:
- 2.5mA (x4 Channels)
- Current - Output / Channel:
- 35 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SO
LT1679CS#TRPBF FAQ
1.How can I place an order for LT1679CS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1679CS#TRPBF 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 LT1679CS#TRPBF reliable?
The price and inventory of LT1679CS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1679CS#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1679CS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1679CS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1679CS#TRPBF?
LT1679CS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1679CS#TRPBF 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 LT1679CS#TRPBF?
For technical support, including LT1679CS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1679CS#TRPBF requirements.
6.How does Aetrix verify that LT1679CS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1679CS#TRPBF 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 LT1679CS#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1679CS#TRPBF?
All LT1679CS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1679CS#TRPBF, 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 LT1679CS#TRPBF part is unused and in its original packaging.
Return procedure for LT1679CS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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