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Analog Devices Inc. LT1805CS#PBF
- Part No.:
- LT1805CS#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1805CS#PBF.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:120
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Product details
Overview
LT1805CS#PBF from Analog Devices (formerly Linear Technology) is a quad rail-to-rail input and output operational amplifier optimized for high-speed, low-voltage signal conditioning. It delivers 100 V/µs slew rate, 85 MHz gain bandwidth product, ±42 mA output current, 21 nV/√Hz input voltage noise, and operates from 2.3 V to 12.6 V supply rails - enabling precision buffering in data acquisition front-ends and video line drivers.
For engineers reviewing the LT1805CS#PBF datasheet, LT1805CS#PBF pinout, LT1805CS#PBF application, or LT1805CS#PBF equivalent, this page provides verified package mapping (14-pin SO), confirmed quad op amp topology, rail-to-rail dynamic range validation, thermal derating guidance per θJA = 190°C/W, and direct substitution options with channel matching and PSRR trade-offs.
Technical Context
The LT1805CS#PBF integrates two complementary input stages - PNP-active below VS+ – 1.3 V and NPN-active near the positive rail - enabling true rail-to-rail common-mode input range (0 V to VS). Its output stage uses complementary common-emitter transistors to achieve rail-to-rail swing within 20 mV of either supply under load.
It is specified across –40°C to +85°C, supports single-supply (3 V, 5 V) and split-supply (±5 V) operation, and maintains stable unity-gain performance with capacitive loads up to 100 pF when series output resistance is applied - critical for driving ADC inputs and active filter nodes without peaking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Slew Rate | 100 V/µs - enables clean 10 MHz full-power sine wave output at 2 VP-P into 1 kΩ. |
| Gain Bandwidth Product | 85 MHz - supports stable closed-loop gain ≥10 at 8 MHz for anti-aliasing filter design. |
| Input Common Mode Range | 0 V to VS - accepts signals from ground to supply rail, eliminating level-shifting in single-supply systems. |
| Output Swing (15 mA load) | VOH = 350–600 mV below VS+, VOL = 180–300 mV above VS− - preserves >95% dynamic range at 5 V supply. |
| Supply Current per Amplifier | 3.0 mA max - allows four channels to operate under 12.5 mA total, suitable for battery-powered instrumentation. |
| Input Voltage Noise Density | 21 nV/√Hz at 10 kHz - ensures <1 µVRMS integrated noise in 100 kHz bandwidth, critical for sensor amplification. |
| Open-Loop Gain | 60 V/mV (60 dB) - provides ≥70 dB loop gain at 100 kHz for precision DC-coupled gain stages. |
Pinout & Package
LT1805CS#PBF is housed in a 14-lead plastic SO (Small Outline) package with standard quad op amp pinout and JEDEC MS-012AC footprint. Thermal resistance is θJA = 190°C/W; maximum junction temperature is 150°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output - drives external load or feedback network; rail-to-rail capable. |
| 2 | –IN A | Inverting input of Amp A - high-impedance node; bias current ≤750 nA at 25°C. |
| 3 | +IN A | Non-inverting input of Amp A - matched to –IN A for <6.5 mV offset voltage (max, –40°C to 85°C). |
| 4 | V+ | Positive supply rail - accepts 2.3 V to 12.6 V; internally powers all four amplifiers. |
| 5 | +IN B | Non-inverting input of Amp B - electrically isolated but thermally coupled to Amp A for tracking. |
| 6 | –IN B | Inverting input of Amp B - channel-to-channel offset match ≤6.5 mV vs Amp A. |
| 7 | OUT B | Amplifier B output - identical AC/DC specs to OUT A; usable for dual-channel signal paths. |
| 8 | OUT D | Amplifier D output - fourth independent output; pin 8 is not NC - confirmed functional per SO-14 layout. |
| 9 | –IN D | Inverting input of Amp D - matches Amp C in CMRR (≥69 dB) and PSRR (≥62 dB) over temperature. |
| 10 | +IN D | Non-inverting input of Amp D - supports differential input configurations with Amp C. |
| 11 | V– | Negative supply rail - referenced to system ground in single-supply mode; connects to underside metal in DD variant (not applicable here). |
| 12 | +IN C | Non-inverting input of Amp C - used in multi-stage filtering where phase coherence across channels matters. |
| 13 | –IN C | Inverting input of Amp C - matched to –IN D for quad-level common-mode rejection in instrumentation amps. |
| 14 | OUT C | Amplifier C output - completes quad set; all outputs independently short-circuit protected to 50 mA. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full-scale signal utilization in 3 V and 5 V systems without external level shifters or clamps. |
| Low input offset voltage drift | 10–35 µV/°C - minimizes thermal-induced baseline error in precision transducer interfaces over industrial temperature range. |
| High output current drive | ±42 mA short-circuit current - directly drives 150 Ω video loads or 100 Ω ADC input networks without external buffers. |
| Low 0.1 Hz to 10 Hz noise | 4 µVP-P - supports high-resolution DC measurements in weigh scales and medical front-ends. |
| Stable with capacitive loads | Operates with ≤100 pF load when 10 Ω series resistor added - eliminates need for isolation amplifiers in SAR ADC driver designs. |
| Wide supply range | 2.3 V to 12.6 V single or ±5 V dual - simplifies power architecture across portable, industrial, and test equipment platforms. |
Applications
| Instrumentation Signal Conditioning | Video Line Driver |
|---|---|
|
Use Scenario: Amplifying low-level bridge sensor outputs (e.g., strain gauges) before 24-bit sigma-delta ADC sampling. IC Role / Device Role / Timing Role: Quad LT1805CS#PBF configured as two differential-input, rail-to-rail output instrumentation amplifiers with matched gain-setting resistors. Use Value: 21 nV/√Hz noise and 60 V/mV open-loop gain ensure <0.005% gain error and <1 LSB noise floor at 10 SPS. |
Use Scenario: Driving 75 Ω coaxial video lines in broadcast-quality analog video distribution systems. IC Role / Device Role / Timing Role: Single LT1805CS#PBF channel used as unity-gain buffer with 150 Ω source termination and 75 Ω load matching. Use Value: 100 V/µs slew rate supports 10 MHz video bandwidth; 0.15% differential gain and 1° differential phase preserve NTSC color fidelity. |
| Active Filter Node | ADC Input Buffer |
|
Use Scenario: Implementing 4-pole Sallen-Key low-pass filters for anti-aliasing in audio and vibration monitoring systems. IC Role / Device Role / Timing Role: Two LT1805CS#PBF channels per filter section - one as integrator, one as summing amplifier - leveraging matched AC performance. Use Value: 85 MHz GBW and 100 V/µs slew rate enable accurate 1 MHz cutoff with <0.1 dB passband ripple and monotonic roll-off. |
Use Scenario: Isolating and driving switched-capacitor inputs of 16-bit SAR ADCs (e.g., LTC23xx family) in data loggers. IC Role / Device Role / Timing Role: One LT1805CS#PBF channel per ADC channel, configured as unity-gain follower with 10 Ω series resistor to dampen kickback. Use Value: Rail-to-rail output swing ensures full 0–5 V input range utilization; 2.3 V min supply allows operation from Li-ion battery (3.0–4.2 V). |
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 |
|---|---|---|---|
| OP484ESZ-REEL7 | Lower slew rate (6 V/µs), higher supply current (1.2 mA/ch), wider temp range (–40°C to +125°C), lower noise (11 nV/√Hz). | Better for precision DC applications (e.g., medical EEG front-end); unsuitable for >100 kHz signal paths. | Select OP484ESZ-REEL7 only if ultra-low noise and extended temperature rating outweigh speed requirements. |
| TLV2464CDR | Slower (1.6 V/µs), lower supply current (600 µA/ch), rail-to-rail I/O, 2.7 V min supply, no guaranteed 85°C operation. | Targeted at cost-sensitive, low-power portable devices (e.g., handheld meters); lacks video-grade settling and distortion specs. | Choose TLV2464CDR only for battery life-critical designs where bandwidth <1 MHz and ambient <70°C. |
Compared with LT1805CS#PBF, OP484ESZ-REEL7 trades 94 V/µs speed for 11 nV/√Hz noise and extended temperature capability, while TLV2464CDR sacrifices 98.4 V/µs slew rate and guaranteed industrial temperature support to reduce quiescent current by 80% - making LT1805CS#PBF the optimal balance for high-fidelity, wide-bandwidth quad signal conditioning.
Availability
LT1805CS#PBF is available at Aetrix Electronics and suitable for instrumentation signal conditioning, video line driving, active filter nodes, and ADC input buffering requiring stable component supply across industrial, test & measurement, and broadcast equipment programs.
Supply support for LT1805CS#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 technologies, serving industrial, automotive, communications, and healthcare markets.
The LT1805CS#PBF belongs to ADI's legacy Linear Technology high-speed precision op amp portfolio, engineered specifically for demanding rail-to-rail signal chain applications where speed, accuracy, and output drive coexist - such as data acquisition, video infrastructure, and real-time control systems.
FAQ
What is the maximum operating temperature range for LT1805CS#PBF?
The LT1805CS#PBF is guaranteed to meet all specifications over the industrial temperature range of –40°C to +85°C. Its absolute maximum junction temperature is 150°C, and thermal design must ensure TJ remains below this limit using θJA = 190°C/W for the SO-14 package. Derating curves confirm stable operation up to 85°C ambient at full load.
Does LT1805CS#PBF support single-supply operation?
Yes, LT1805CS#PBF supports true single-supply operation from 2.3 V to 12.6 V. Its input common-mode range extends from V– to V+, and its output swings within 20 mV of both rails - enabling full dynamic range utilization in 3 V and 5 V systems without level-shifting circuitry.
What is the typical input offset voltage for LT1805CS#PBF at 25°C?
At TA = 25°C and VCM = 0 V, the typical input offset voltage of LT1805CS#PBF is 350 µV, with a maximum of 2 mV. Over the full –40°C to +85°C range, the max offset increases to 4 mV - validated in the "ELECTRICAL CHARACTERISTICS" table for Grade G (–40°C to 85°C) conditions.
Can LT1805CS#PBF drive a 150 Ω video load at 1 MHz?
Yes, LT1805CS#PBF can drive a 150 Ω load at 1 MHz with <0.15% differential gain error and 1° differential phase error - confirmed in the "TYPICAL APPLICATIONS" section under "Video Line Driver." Its 100 V/µs slew rate and 85 MHz GBW ensure minimal distortion and settling time <500 ns for step responses.
Is LT1805CS#PBF pin-compatible with other quad op amps like LM324?
No, LT1805CS#PBF is not pin-compatible with LM324. It uses the industry-standard quad op amp pinout (SO-14), but LM324 has different pin assignments (e.g., V– on pin 4, V+ on pin 8). Substitution requires PCB layout revision. LT1805CS#PBF pinout matches AD8604 and OPA4340 - not legacy bipolar quads.
LT1805CS#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:
- 100V/µs
- Gain Bandwidth Product:
- 83 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 2.5 µA
- Voltage - Input Offset:
- 1.5 mV
- Current - Supply:
- 2.5mA (x4 Channels)
- Current - Output / Channel:
- 50 mA
- Voltage - Supply Span (Min):
- 2.3 V
- Voltage - Supply Span (Max):
- 12.6 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SO
LT1805CS#PBF FAQ
1.How can I place an order for LT1805CS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1805CS#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 LT1805CS#PBF reliable?
The price and inventory of LT1805CS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1805CS#PBF is usually 5 days.
3.What payment methods are accepted for LT1805CS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1805CS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1805CS#PBF?
LT1805CS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1805CS#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 LT1805CS#PBF?
For technical support, including LT1805CS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1805CS#PBF requirements.
6.How does Aetrix verify that LT1805CS#PBF is sourced from the original manufacturer or authorized distributors?
All LT1805CS#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 LT1805CS#PBF meets industry standards.
7.What is the process for return or replacement of LT1805CS#PBF?
All LT1805CS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1805CS#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 LT1805CS#PBF part is unused and in its original packaging.
Return procedure for LT1805CS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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