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Analog Devices Inc. LT6238CGN#PBF
- Part No.:
- LT6238CGN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LT6238CGN#PBF.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:486
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Product details
Overview
LT6238CGN#PBF from Analog Devices (formerly Linear Technology) is a quad, low-noise, rail-to-rail output operational amplifier optimized for high-precision SAR ADC driving. It delivers 1.1nV/√Hz input voltage noise density, 215MHz gain-bandwidth product, 70V/µs slew rate, and 3.5mA per amplifier supply current - enabling accurate 16-bit to 18-bit data acquisition in low-voltage (3V–12.6V) systems.
For engineers reviewing the LT6238CGN#PBF datasheet, LT6238CGN#PBF pinout, LT6238CGN#PBF application, or LT6238CGN#PBF equivalent, this page provides verified package mapping (16-lead SSOP), confirmed quad-channel pin assignment, real-world settling performance (570ns to 18-bit), THD = –116.8dB at 2kHz, and validated alternatives for SAR ADC front-end design.
Technical Context
The LT6238CGN#PBF implements a fully differential, unity-gain-stable voltage-feedback architecture with internal compensation. Its rail-to-rail output swings within 50mV of either supply rail under load, supporting dynamic range maximization in 3.3V and ±5V systems. Input stage uses precision bipolar topology to achieve low offset drift (0.5µV/°C typical) and high CMRR (95dB).
It features four independent amplifiers in one package, each with matched input characteristics (offset match ≤100µV, bias current match ≤0.1µA) and shared thermal environment - critical for multi-channel simultaneous-sampling ADC interfaces. No enable/shutdown pin is present on the LT6238 variant, distinguishing it from the LT6236 single-channel version.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Noise Density | 1.1nV/√Hz at 10kHz - enables sub-100µV RMS noise contribution in 1MHz bandwidth ADC driver stages |
| Gain-Bandwidth | 215MHz - supports stable closed-loop gain ≥10 up to ~20MHz, sufficient for >10Msps SAR ADC sampling |
| Slew Rate | 70V/µs - ensures full-scale 4V step settles within 570ns to 18-bit accuracy (4ppm) |
| Supply Range | 3V to 12.6V single-supply or ±1.5V to ±5V dual-supply - compatible with modern low-voltage data acquisition rails |
| Output Swing | Rail-to-rail: within 50mV of V+ and V– at 20mA load - preserves >97% of available signal swing at 3.3V supply |
| THD @ 2kHz | –116.8dB - meets SFDR requirements for 16-bit+ resolution without post-processing correction |
| Input Offset | 350µV max (0°C to 70°C) - contributes <0.005% FSR error in 12-bit systems, negligible in 16-bit+ with calibration |
Pinout & Package
LT6238CGN#PBF is housed in a 16-lead narrow plastic SSOP (GN package), 5.3mm × 7.8mm body, 0.635mm pitch. Thermal resistance θJA = 110°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output - drives ADC IN+ or filter network; capable of sourcing/sinking 20mA |
| 2 | –IN A | Inverting input of Amp A - high-impedance node (6.5MΩ common-mode); requires matched layout for THD control |
| 3 | +IN A | Non-inverting input of Amp A - same impedance as Pin 2; used for unity-gain buffer or differential drive |
| 4 | V+ | Positive supply rail - decoupling capacitor (0.1µF) required within 5mm for stability |
| 5 | +IN B | Non-inverting input of Amp B - electrically isolated but thermally coupled to Amp A for matching |
| 6 | –IN B | Inverting input of Amp B - matches Pin 2 offset and noise specs; used in interleaved ADC configurations |
| 7 | OUT B | Amplifier B output - identical AC/DC specs to Pin 1; supports dual-channel simultaneous sampling |
| 8 | NC | No connect - no internal connection; must be left floating or grounded per layout best practices |
| 9 | OUT D | Amplifier D output - fourth channel; shares same die substrate as A/B/C for thermal tracking |
| 10 | –IN D | Inverting input of Amp D - matches Pin 2/6/14; critical for multi-channel phase coherence |
| 11 | +IN D | Non-inverting input of Amp D - symmetric routing recommended to minimize inter-channel skew |
| 12 | V– | Negative supply rail - return path for all four amplifiers; low-inductance plane essential |
| 13 | +IN C | Non-inverting input of Amp C - third channel input; enables 4-channel synchronous analog front-end |
| 14 | –IN C | Inverting input of Amp C - matched to other inputs; supports differential pair configuration with Pin 13 |
| 15 | OUT C | Amplifier C output - completes quad set; usable for reference buffer or auxiliary signal conditioning |
| 16 | NC | No connect - unused pad; no internal bond wire; may be tied to ground for mechanical stability |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Delivers >97% of full-scale signal amplitude at 3.3V supply, maximizing SNR in low-voltage ADC systems |
| 1.1nV/√Hz input noise | Ensures <1LSB noise floor contribution in 18-bit, 100kSPS SAR ADCs with 100kHz effective bandwidth |
| 570ns 18-bit settling time | Validated at 2VP-P step, enabling reliable operation with LTC2389-18 and similar 2.5Msps+ converters |
| Quad-channel matching | Channel-to-channel offset match ≤100µV and noise correlation support coherent multi-channel acquisition |
| –40°C to 125°C operation | Specified over industrial temperature range (LT6238HGN), though LT6238CGN#PBF is rated 0°C to 70°C |
| Stable with 100Ω load | Drives ADC input RC networks directly without external isolation resistor, reducing component count |
Applications
| High-Speed Data Acquisition | Differential SAR ADC Driver |
|---|---|
Use Scenario: Simultaneous sampling of four sensor channels (e.g., vibration, pressure, temperature, current) feeding a quad-channel 18-bit SAR ADC like LTC2389-18. IC Role / Device Role / Timing Role: LT6238CGN#PBF provides matched, low-noise, fast-settling buffering and level-shifting for each ADC input pair. Use Value: Achieves 98.9dB SINAD and 117.7dB SFDR at 2kHz, meeting metrology-grade measurement requirements without digital correction. | Use Scenario: Driving the differential inputs of a 16-bit SAR ADC (e.g., AD7960) from a single-ended source using an instrumentation-grade difference amplifier topology. IC Role / Device Role / Timing Role: One LT6238CGN#PBF channel serves as precision gain stage; another as reference buffer; remaining two as complementary output drivers. Use Value: Maintains THD ≤ –116.8dB and 570ns settling across full 2VP-P range, eliminating timing skew between IN+ and IN– paths. |
| Multi-Channel Active Filter Bank | Low-Power Precision Signal Chain |
Use Scenario: Four independent 4th-order anti-aliasing filters preceding a multiplexed ADC in portable medical instrumentation (e.g., ECG front-end). IC Role / Device Role / Timing Role: Each LT6238CGN#PBF amplifier implements one filter stage with precise pole placement via matched external components. Use Value: Low 3.5mA per amplifier supply current enables battery-powered 8-hour operation; rail-to-rail output supports 3.3V rail-limited filter headroom. | Use Scenario: Signal conditioning for IoT sensor nodes requiring 16-bit accuracy, low standby power, and operation from single 3.7V Li-ion cell. IC Role / Device Role / Timing Role: LT6238CGN#PBF operates from 3.3V supply, buffers transducer outputs, and drives ADC while consuming only 14mA total quiescent current. Use Value: 1.1nV/√Hz noise and 350µV max offset ensure <0.01% linearity error without calibration, reducing firmware overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADA4897-4ARUZ | Lower noise (0.9nV/√Hz), higher supply current (6.5mA/amp), no rail-to-rail output (clips 120mV from rails) | Better for ultra-low-noise preamp stages; unsuitable where full 3.3V swing is required | Select when noise dominates over power or swing requirements; verify layout for higher current density |
| OPA211IDR | Higher precision (10µV offset), lower bandwidth (45MHz), higher cost; rail-to-rail input but not output | Preferred for DC-critical sensor interfaces; insufficient GBW for >500ksps SAR ADC driving | Choose for high-accuracy, low-frequency (<100kHz) applications where speed is secondary to offset stability |
Compared with ADA4897-4ARUZ and OPA211IDR, the LT6238CGN#PBF uniquely balances 215MHz bandwidth, rail-to-rail output, 1.1nV/√Hz noise, and 3.5mA/amp consumption - making it the optimal choice for high-speed, low-voltage, multi-channel SAR ADC front-ends where signal fidelity and power efficiency are co-constrained.
Availability
LT6238CGN#PBF is available at Aetrix Electronics and suitable for high-speed data acquisition, precision sensor interfacing, and multi-channel active filtering requiring stable component supply and guaranteed 0°C to 70°C performance.
Supply support for LT6238CGN#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, acquired Linear Technology in 2017 to strengthen its precision amplifier portfolio.
The LT6238 belongs to ADI's high-speed, low-noise precision op amp family designed specifically for demanding data converter interface and wideband signal conditioning applications in test equipment, medical imaging, and industrial automation.
FAQ
What is the operating temperature range for LT6238CGN#PBF?
The LT6238CGN#PBF is specified for operation from 0°C to 70°C ambient temperature. This commercial-grade rating is indicated by the "C" suffix in the part number. For extended temperature applications, consider the LT6238IGN#PBF (–40°C to 85°C) or LT6238HGN#PBF (–40°C to 125°C) variants, which share identical electrical specifications but undergo broader temperature screening.
Does LT6238CGN#PBF include an enable/shutdown pin?
No, the LT6238CGN#PBF does not feature an enable or shutdown pin. Unlike the LT6236 (single-channel) which includes an ENABLE pin to reduce supply current to <10µA, the quad LT6238 has no power-management control. All four amplifiers remain active whenever V+ and V– supplies are present. Power gating must be implemented externally if needed.
What is the maximum capacitive load LT6238CGN#PBF can drive stably?
The LT6238CGN#PBF is stable driving up to 100pF capacitive load in unity-gain configuration, as verified in the datasheet's Typical Performance Characteristics (Figure G22). For larger loads (e.g., ADC input capacitance + PCB trace), a small series resistor (10–50Ω) between amplifier output and load is recommended to maintain phase margin and prevent peaking or oscillation.
Can LT6238CGN#PBF operate on a single 3.3V supply?
Yes, the LT6238CGN#PBF is fully specified for single-supply operation from 3V to 12.6V. At 3.3V, it delivers rail-to-rail output swing (within 50mV of each rail), 3.5mA per amplifier supply current, and maintains 1.1nV/√Hz noise density - making it ideal for modern low-voltage data acquisition systems powered by 3.3V LDOs or buck regulators.
How does LT6238CGN#PBF compare to LT6237 dual op amp in terms of channel matching?
The LT6238CGN#PBF specifies channel-to-channel input offset voltage match ≤100µV and input bias current match ≤0.1µA (Note 6), identical to the LT6237 dual op amp. Both devices are fabricated on the same process and leverage matched transistor pairs across channels, ensuring consistent performance for multi-channel synchronous sampling - critical when driving interleaved or parallel ADC architectures.
LT6238CGN#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- LT®
- Package/Case:
- 16-SSOP (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:
- 70V/µs
- Gain Bandwidth Product:
- 215 MHz
- -3db Bandwidth:
- 90 MHz
- Current - Input Bias:
- 5 µA
- Voltage - Input Offset:
- 350 µV
- Current - Supply:
- 3.15mA (x4 Channels)
- Current - Output / Channel:
- 30 mA
- Voltage - Supply Span (Min):
- 3 V
- Voltage - Supply Span (Max):
- 12.6 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
LT6238CGN#PBF FAQ
1.How can I place an order for LT6238CGN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT6238CGN#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 LT6238CGN#PBF reliable?
The price and inventory of LT6238CGN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT6238CGN#PBF is usually 5 days.
3.What payment methods are accepted for LT6238CGN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT6238CGN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT6238CGN#PBF?
LT6238CGN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT6238CGN#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 LT6238CGN#PBF?
For technical support, including LT6238CGN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT6238CGN#PBF requirements.
6.How does Aetrix verify that LT6238CGN#PBF is sourced from the original manufacturer or authorized distributors?
All LT6238CGN#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 LT6238CGN#PBF meets industry standards.
7.What is the process for return or replacement of LT6238CGN#PBF?
All LT6238CGN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT6238CGN#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 LT6238CGN#PBF part is unused and in its original packaging.
Return procedure for LT6238CGN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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