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Analog Devices Inc. LT1679CS#PBF
- Part No.:
- LT1679CS#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1679CS#PBF.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,163
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Product details
Overview
LT1679CS#PBF 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, 20MHz gain bandwidth, 100µV max input offset voltage, and operates from 2.7V to 36V supply. It is used in portable microphones, strain gauge amplifiers, and instrumentation systems requiring microvolt-level accuracy.
For engineers reviewing the LT1679CS#PBF datasheet, LT1679CS#PBF pinout, LT1679CS#PBF application, or LT1679CS#PBF equivalent, this page provides verified specifications, SO-14 package details, rail-to-rail I/O behavior, matching performance data, and real-world design context for low-noise analog front-ends.
Technical Context
The LT1679CS#PBF integrates four independent op amps in a single SO-14 package with matched internal circuitry enabling high-precision differential applications like instrumentation amplifiers. Its input stage eliminates phase inversion when common-mode voltage exceeds either rail by 100mV, and its output swings within 170mV of both rails under light load.
It features dual complementary input pairs (NPN/PNP) that automatically switch based on common-mode voltage, maintaining functionality across ±15V or single 3–36V supplies. Matching specifications-including ∆VOS ≤ 150µV (0°C to 70°C) and ∆CMRR ≥ 94dB-support tightly coupled dual-amplifier topologies without external trimming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 20MHz - supports stable unity-gain buffers and closed-loop filters up to ~10MHz with adequate phase margin. |
| Voltage Noise Density | 3.9nV/√Hz at 1kHz - enables high-fidelity amplification of µV-level sensor signals without dominating system noise floor. |
| Input Offset Voltage | 100µV max (–40°C to 85°C) - ensures <1mV error in 10V full-scale measurements without calibration. |
| Rail-to-Rail Output Swing | Within 170mV of rails at 0.1mA - maximizes dynamic range in 3.3V or 5V single-supply systems. |
| Common-Mode Input Range | –0.1V to VS + 0.1V - allows direct interfacing to sensors operating beyond supply rails, e.g., thermocouples or bridge outputs. |
| Supply Voltage Range | 2.7V to 36V (±1.35V to ±18V) - supports battery-powered portables and industrial 24V systems with one part number. |
| Channel Matching (∆VOS) | 150µV max (0°C to 70°C) - enables accurate two-op-amp instrumentation amplifier designs without laser trimming. |
Pinout & Package
LT1679CS#PBF is housed in a 14-lead plastic SO (Small Outline) package, 150-mil width, with standard JEDEC MS-012AC footprint and 1.27mm pitch. Thermal resistance θJA = 160°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output - drives loads up to 10mA while maintaining rail-to-rail swing. |
| 2 | –IN A | Inverting input of Amp A - high-impedance node (2GΩ) with matched bias current to +IN A. |
| 3 | +IN A | Noninverting input of Amp A - accepts common-mode voltages from –0.1V to VS + 0.1V. |
| 4 | V+ | Positive supply rail - connects to main positive supply (2.7V–36V); decoupling recommended. |
| 5 | +IN B | Noninverting input of Amp B - electrically identical to +IN A; used for matched-pair configurations. |
| 6 | –IN B | Inverting input of Amp B - matched to –IN A for differential gain stages. |
| 7 | OUT B | Amplifier B output - independent channel with same noise, bandwidth, and drive capability as OUT A. |
| 8 | OUT D | Amplifier D output - fourth channel; pin 8 is not ground or NC - critical for quad layout. |
| 9 | –IN D | Inverting input of Amp D - matches –IN A/B/C per datasheet Table "Matching Parameters". |
| 10 | +IN D | Noninverting input of Amp D - used in multi-channel sensor interfaces or active filtering arrays. |
| 11 | V– | Negative supply rail - connects to GND (single supply) or negative rail (dual supply); must be stable. |
| 12 | +IN C | Noninverting input of Amp C - third channel input; supports independent signal paths or feedback networks. |
| 13 | –IN C | Inverting input of Amp C - matched to other inverting inputs for consistent CMRR across all channels. |
| 14 | OUT C | Amplifier C output - completes quad configuration; usable for guard drivers or reference buffering. |
Key Features
| Feature | Design Value |
|---|---|
| No phase inversion on over-rail inputs | Enables robust interfacing to sensors exceeding supply rails without latch-up or distortion in servo loops. |
| 0.1Hz–10Hz peak-to-peak noise | 90nVP-P - supports DC-coupled microvolt-threshold detection in medical or precision metrology. |
| Matched amplifier pairs (A/D, B/C) | ∆VOS ≤ 150µV ensures <0.015% gain error in 2-op-amp IA topologies without trimming. |
| High PSRR (106dB min) | Maintains accuracy in noisy environments (e.g., motor drives or switching power supplies) without extra filtering. |
| Single-supply operation down to 2.7V | Allows direct use with Li-ion (3.0–4.2V) or 3.3V logic rails - no charge pump or level-shifting required. |
Applications
| Strain Gauge Amplifier | Portable Microphone Preamp |
|---|---|
Use Scenario: Amplifying mV-level Wheatstone bridge outputs from load cells or pressure sensors in handheld test equipment. IC Role / Device Role / Timing Role: Quad LT1679CS#PBF configured as two matched-instrumentation amplifiers (A+B and C+D), providing gain, common-mode rejection, and rail-to-rail output swing. Use Value: 100µV offset and 3.9nV/√Hz noise enable resolution better than 0.01% FS without chopper stabilization or auto-zero circuitry. | Use Scenario: Low-noise preamplification of electret microphone outputs in battery-powered voice recorders or IoT audio nodes. IC Role / Device Role / Timing Role: Single LT1679CS#PBF channel used in noninverting configuration with 10kΩ feedback, powered from 3.3V. Use Value: Rail-to-rail output swing preserves full 3.3V ADC dynamic range; 90nVP-P 0.1–10Hz noise avoids audible hiss in voiceband. |
| Infrared Detector Interface | Microvolt Threshold Detector |
Use Scenario: Conditioning pyroelectric or photodiode signals in motion-sensing security systems with ambient temperature variation. IC Role / Device Role / Timing Role: LT1679CS#PBF channel used in transimpedance configuration with low-leakage feedback network. Use Value: 20nA max input bias current prevents signal loss in high-Z detector circuits; 100dB CMRR rejects EMI from nearby AC wiring. | Use Scenario: Detecting sub-millivolt fault signatures in battery management or industrial safety monitoring. IC Role / Device Role / Timing Role: LT1679CS#PBF configured as comparator with hysteresis, using internal matching for reference stability. Use Value: 100µV offset and 0.4µV/°C drift ensure trip-point stability across –40°C to 85°C without recalibration. |
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 |
|---|---|---|---|
| OP4177ARZ | Lower noise (2.9nV/√Hz), higher offset (60µV typ), 3MHz GBW, SO-14, specified for –40°C to +125°C | Better for ultra-low-noise DC-coupled applications; insufficient bandwidth for >1MHz signal chains | Select OP4177ARZ when noise dominates over speed and extended temperature range is required. |
| TLV2464CDR | Higher noise (22nV/√Hz), rail-to-rail I/O, 6.4MHz GBW, SO-14, 1.8–6V supply only | Suitable for cost-sensitive, low-voltage portable designs where noise <10nV/√Hz is not critical | Select TLV2464CDR only for 1.8–6V systems where budget constraints outweigh noise and precision requirements. |
Compared with OP4177ARZ and TLV2464CDR, the LT1679CS#PBF uniquely balances 20MHz bandwidth, 3.9nV/√Hz noise, and true rail-to-rail operation from 2.7V - making it optimal for wide-supply, high-speed precision sensing where both speed and low-frequency accuracy matter.
Availability
LT1679CS#PBF is available at Aetrix Electronics and suitable for strain gauge amplifiers, portable microphone preamps, infrared detector interfaces, and microvolt threshold detectors requiring stable component supply across industrial and medical product lifecycles.
Supply support for LT1679CS#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, 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#PBF belongs to ADI's legacy Linear Technology precision op amp family, designed specifically for low-noise, rail-to-rail signal conditioning in battery-powered and industrial instrumentation where microvolt accuracy and wide supply flexibility are essential.
FAQ
What is the maximum supply voltage rating for LT1679CS#PBF?
The LT1679CS#PBF has an absolute maximum supply voltage of ±18V (36V total), with guaranteed operation from 2.7V to 36V. It maintains rail-to-rail input/output performance across this full range, including single 3.3V, 5V, and 24V systems. Exceeding ±18V risks permanent damage per Absolute Maximum Ratings.
Does LT1679CS#PBF support true rail-to-rail input and output simultaneously?
Yes, the LT1679CS#PBF supports rail-to-rail input (–0.1V to VS + 0.1V) and rail-to-rail output (within 170mV of either rail at 0.1mA) simultaneously. This enables full utilization of supply headroom in single-supply configurations - for example, delivering 0–3.13V output from a 3.3V rail while accepting 0–3.4V input signals without phase reversal.
How does the matching performance of LT1679CS#PBF benefit instrumentation amplifier designs?
The LT1679CS#PBF specifies matched parameters between amplifier pairs (A/D and B/C), including ∆VOS ≤ 150µV and ∆CMRR ≥ 94dB over 0°C to 70°C. This allows building accurate two-op-amp instrumentation amplifiers without external trimming components - reducing BOM count, PCB area, and calibration complexity while achieving >80dB common-mode rejection in compact layouts.
Can LT1679CS#PBF operate from a single 3V supply?
Yes, the LT1679CS#PBF is fully specified and characterized for single 3V operation (VS = 3V, VCM = VO = 1.7V). It delivers 3.9nV/√Hz noise, 20MHz GBW, and rail-to-rail I/O at 3V - making it ideal for coin-cell or Li-ion powered devices where supply headroom is constrained and precision cannot be compromised.
What is the 0.1Hz to 10Hz noise specification for LT1679CS#PBF?
The LT1679CS#PBF exhibits 90nVP-P typical input-referred voltage noise over 0.1Hz to 10Hz at VCM = VS, and 180nVP-P at VCM = 0V. This low 1/f noise enables high-resolution DC measurements in applications such as thermopile amplification, pH sensing, and precision weigh scales where long-term drift and low-frequency interference dominate.
LT1679CS#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- LT®
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LT1679CS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1679CS#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 LT1679CS#PBF reliable?
The price and inventory of LT1679CS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1679CS#PBF is usually 5 days.
3.What payment methods are accepted for LT1679CS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1679CS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1679CS#PBF?
LT1679CS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1679CS#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 LT1679CS#PBF?
For technical support, including LT1679CS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1679CS#PBF requirements.
6.How does Aetrix verify that LT1679CS#PBF is sourced from the original manufacturer or authorized distributors?
All LT1679CS#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 LT1679CS#PBF meets industry standards.
7.What is the process for return or replacement of LT1679CS#PBF?
All LT1679CS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1679CS#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 LT1679CS#PBF part is unused and in its original packaging.
Return procedure for LT1679CS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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