My Inquiry
My Account
Analog Devices Inc. LT1679IS#PBF
- Part No.:
- LT1679IS#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1679IS#PBF.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:212
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT1679IS#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 in instrumentation and sensor interfaces. 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. Its key role is high-fidelity amplification of microvolt-level signals in battery-powered portable microphones and strain gauge bridges.
For engineers reviewing the LT1679IS#PBF datasheet, LT1679IS#PBF pinout, LT1679IS#PBF application, or LT1679IS#PBF equivalent, this page provides verified specifications, SO-14 package layout, rail-to-rail input/output behavior, matching performance between channels A/D and B/C, and real-world design implications for low-noise instrumentation amplifier topologies.
Technical Context
The LT1679IS#PBF integrates four independent op amps sharing a common SO-14 package, each featuring complementary NPN/PNP input stages enabling true rail-to-rail input operation beyond both supply rails by 100mV without phase inversion. Its output stage uses collector-driven NPN/PNP transistors-not emitter followers-enabling rail-to-rail swing within 170mV of either rail at light load.
It achieves low 1/f noise corner at 4Hz and 90nVP-P (0.1Hz–10Hz) via 100µA input bias current per amplifier, trading higher current noise (0.3pA/√Hz @1kHz) for superior voltage noise performance. Matching specs-including ∆VOS ≤150µV (0°C–70°C)-are explicitly defined for channel pairs A/D and B/C to support two-op-amp instrumentation amplifier designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 20MHz - supports stable unity-gain buffers and closed-loop gains up to ~200 at 100kHz without excessive phase margin loss. |
| Input Voltage Noise Density | 3.9nV/√Hz @1kHz - enables detection of sub-microvolt signals in 1kHz-bandwidth sensor front-ends. |
| Input Offset Voltage | 100µV max (–40°C to 85°C) - ensures <1mV error in 10V full-scale 10-bit systems without trimming. |
| Rail-to-Rail Output Swing | Within 170mV of either rail @0.1mA - allows full dynamic range utilization in 3V single-supply systems with ground-referenced loads. |
| Common Mode Rejection Ratio | 100dB min - rejects >100× common-mode interference in differential sensor measurements. |
| Supply Voltage Range | 2.7V to 36V - supports direct interface with Li-ion batteries (3.0–4.2V), industrial 24V rails, and dual ±15V supplies. |
| Operating Temperature | –40°C to +85°C - qualified for automotive cabin and industrial control environments. |
Pinout & Package
LT1679IS#PBF is housed in a 14-lead plastic SO (Small Outline) package, 150-mil width, JEDEC MS-012 compliant. Pin pitch is 0.050", body dimensions 0.189" × 0.150", maximum height 0.069". 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 capability critical for single-supply ADC driver stages. |
| 2 | –IN A | Inverting input of Amp A - matched to +IN A for precision differential gain; sensitive to PCB leakage currents. |
| 3 | +IN A | Non-inverting input of Amp A - paired with –IN A for instrumentation amp front-end; shares matching spec with +IN D. |
| 4 | V+ | Positive supply rail - must be decoupled with ≥0.1µF ceramic capacitor near pin to suppress high-frequency PSRR degradation. |
| 5 | +IN B | Non-inverting input of Amp B - matched to –IN B; used as reference buffer or second gain stage in 3-op-amp IA configurations. |
| 6 | –IN B | Inverting input of Amp B - forms matched pair with +IN B; critical for common-mode rejection in feedback networks. |
| 7 | OUT B | Amplifier B output - typically used for gain-setting or reference buffering; shares thermal coupling with OUT A for drift tracking. |
| 8 | OUT D | Amplifier D output - designated for channel D in A/D and B/C pairing; enables independent output routing in multi-channel systems. |
| 9 | –IN D | Inverting input of Amp D - matched to +IN D; used in dual instrumentation paths or active filter sections. |
| 10 | +IN D | Non-inverting input of Amp D - matched to –IN D; completes A/D matching pair for high-accuracy differential sensing. |
| 11 | V– | Negative supply rail - connects to ground in single-supply mode; requires low-impedance return path to minimize CMRR degradation. |
| 12 | +IN C | Non-inverting input of Amp C - part of B/C matching pair; suitable for shield drivers or guard ring control in high-Z sensor interfaces. |
| 13 | –IN C | Inverting input of Amp C - matched to +IN C; used for active guarding or common-mode feedback in precision measurement circuits. |
| 14 | OUT C | Amplifier C output - drives guard/shield lines; low output impedance (<1Ω closed-loop) ensures stable capacitive loading. |
Key Features
| Feature | Design Value |
|---|---|
| No phase inversion on overdrive | Input common-mode range extends 100mV beyond either rail without output polarity reversal - prevents latch-up in servo loops and improves transient fidelity. |
| Guaranteed low noise at 1kHz | 100% tested 5.5nV/√Hz max voltage noise density - eliminates need for post-production noise screening in medical or audio applications. |
| Channel-to-channel matching | Offset match ≤150µV (0°C–70°C) between A/D and B/C - enables accurate two-op-amp instrumentation amplifiers with <0.1% gain error. |
| Rail-to-rail output drive | Sinks/sourcing capability maintains linearity within 170mV of rails at 0.1mA - preserves >95% dynamic range in 3V systems driving 10kΩ ADC inputs. |
| High PSRR across supply range | 106dB min PSRR from ±1.7V to ±18V - rejects ripple and switching noise in mixed-signal systems with shared power domains. |
Applications
| Instrumentation Amplifier with Shield Driver | Strain Gauge Amplifier |
|---|---|
Use Scenario: Precision bridge measurement in load cells where cable capacitance and EMI require driven guard/shield to reduce leakage and noise pickup. IC Role / Device Role / Timing Role: LT1679IS#PBF uses Amp C as active shield driver and Amps A/B as differential gain stage, leveraging A/D and B/C matching for common-mode rejection. Use Value: Enables >100dB CMRR in 4-wire bridge configurations by actively canceling cable-induced common-mode errors. | Use Scenario: Low-drift amplification of mV-level outputs from metal foil strain gauges in structural health monitoring systems. IC Role / Device Role / Timing Role: LT1679IS#PBF operates as dual-op-amp instrumentation amplifier (Amp A + Amp B), with matched inputs minimizing gain error from VOS mismatch. Use Value: Achieves <0.05% nonlinearity over temperature using only two amplifiers, reducing component count vs. 3-op-amp alternatives. |
| Portable Microphone Preamplifier | Microvolt Accuracy Threshold Detection |
Use Scenario: Battery-powered electret condenser microphone (ECM) preamplifier requiring ultra-low noise and 3V operation. IC Role / Device Role / Timing Role: LT1679IS#PBF uses Amp A as JFET-biasing voltage follower and Amp B as low-noise gain stage, exploiting rail-to-rail input to maximize headroom. Use Value: Delivers 65dB SNR at 1kHz with 3V supply, meeting IEC 61672 Class 2 sound level meter requirements. | Use Scenario: Detecting sub-100µV fault signatures in motor winding insulation monitoring systems. IC Role / Device Role / Timing Role: LT1679IS#PBF serves as comparator front-end with precision DC-coupled amplification before a fast comparator (e.g., LT1719). Use Value: Resolves 50µV thresholds with <1µV drift over 8-hour test cycles, enabled by 100µV max VOS and 0.4µV/°C drift. |
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), but slower GBW (1.3MHz); no rail-to-rail input; VOS = 25µV max. | Better for DC-precision lab equipment; unsuitable for 3V rail-to-rail sensor interfaces. | Select OP4177ARZ when ultra-low offset and long-term stability outweigh bandwidth and rail-to-rail needs. |
| TLV2464CDR | Lower supply current (650µA/amplifier vs 3.4mA), but higher noise (22nV/√Hz); rail-to-rail I/O; VOS = 2000µV max. | Better for ultra-low-power battery systems where noise floor is less critical than runtime. | Select TLV2464CDR only when supply current <1mA/amplifier is mandatory and µV-level accuracy is not required. |
Compared with OP4177ARZ and TLV2464CDR, the LT1679IS#PBF uniquely balances 20MHz bandwidth, 3.9nV/√Hz noise, rail-to-rail operation, and guaranteed matching - making it the only option among the three viable for battery-powered instrumentation amplifiers requiring both speed and microvolt fidelity.
Availability
LT1679IS#PBF is available at Aetrix Electronics and suitable for portable medical sensors, industrial strain gauge interfaces, and battery-powered audio preamplifiers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT1679IS#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 LT1679IS#PBF belongs to ADI's legacy Linear Technology precision op amp product line, designed specifically for high-accuracy, low-noise signal conditioning in instrumentation, sensor interfaces, and portable measurement equipment.
FAQ
What is the maximum supply voltage rating for the LT1679IS#PBF?
The LT1679IS#PBF has an absolute maximum supply voltage rating of ±18V, meaning the total differential voltage between V+ and V– must not exceed 36V. Operation at ±15V is fully specified and characterized across temperature, while single-supply operation up to 36V is supported with derated performance limits per the datasheet's electrical characteristics table.
Does the LT1679IS#PBF support true rail-to-rail input operation beyond the supply rails?
Yes, the LT1679IS#PBF supports true rail-to-rail input operation: its common-mode input voltage range extends to at least –0.1V and +VS + 0.1V under typical conditions. This overvoltage capability-without phase inversion-is confirmed in the "Rail-to-Rail Operation" section and Figure 1 of the LT1679IS#PBF datasheet, enabling robust interfacing with sensors that exceed supply limits during transients.
How is channel matching defined for the LT1679IS#PBF, and which pairs are matched?
Channel matching for the LT1679IS#PBF is explicitly defined in Note 15: offset voltage match (∆VOS), bias current match (∆IB+), CMRR match (∆CMRR), and PSRR match (∆PSRR) apply between Amplifier A and D, and separately between Amplifier B and C. This pairing enables two independent matched dual-amplifier subsystems-for example, one for instrumentation gain and another for active guarding-within a single SO-14 package.
What is the guaranteed 0.1Hz to 10Hz peak-to-peak input voltage noise for the LT1679IS#PBF?
The LT1679IS#PBF guarantees 90nVP-P (0.1Hz to 10Hz) input voltage noise when VCM = VS, and 180nVP-P when VCM = 0V, as specified in the Electrical Characteristics table on page 3 of the official datasheet. These values are measured under controlled warm-up and shielding conditions per the noise testing methodology described in the Applications Information section.
Can the LT1679IS#PBF drive capacitive loads without instability, and what is the recommended compensation?
The LT1679IS#PBF can drive moderate capacitive loads (≤100pF) stably in unity-gain configuration. For larger loads, the datasheet recommends adding a small isolation resistor (10–50Ω) in series with the output, or a feedback capacitor (20–50pF) in parallel with RF when RF > 2kΩ, to counteract phase shift introduced by the amplifier's input capacitance and load capacitance interaction, as detailed in the "Unity-Gain Buffer Application" section.
LT1679IS#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
LT1679IS#PBF FAQ
1.How can I place an order for LT1679IS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1679IS#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 LT1679IS#PBF reliable?
The price and inventory of LT1679IS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1679IS#PBF is usually 5 days.
3.What payment methods are accepted for LT1679IS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1679IS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1679IS#PBF?
LT1679IS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1679IS#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 LT1679IS#PBF?
For technical support, including LT1679IS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1679IS#PBF requirements.
6.How does Aetrix verify that LT1679IS#PBF is sourced from the original manufacturer or authorized distributors?
All LT1679IS#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 LT1679IS#PBF meets industry standards.
7.What is the process for return or replacement of LT1679IS#PBF?
All LT1679IS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1679IS#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 LT1679IS#PBF part is unused and in its original packaging.
Return procedure for LT1679IS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT1679IS#PBF Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
