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Analog Devices Inc. LT6238IGN#PBF
- Part No.:
- LT6238IGN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LT6238IGN#PBF.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:100
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Product details
Overview
LT6238IGN#PBF from Analog Devices (formerly Linear Technology) is a quad, rail-to-rail output, low-noise operational amplifier optimized as a high-precision SAR ADC driver. 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 LT6238IGN#PBF datasheet, LT6238IGN#PBF pinout, LT6238IGN#PBF application, or LT6238IGN#PBF equivalent, key selection criteria include its guaranteed –40°C to +85°C operating range, 16-lead SSOP package, differential driving capability for high-speed SAR converters like LTC2389-18, and low 350µV max input offset voltage with rail-to-rail output swing within 50mV of either supply rail.
Technical Context
The LT6238IGN#PBF implements a fully complementary bipolar input stage delivering ultra-low voltage noise without sacrificing bandwidth or power efficiency. Its architecture supports stable operation with capacitive loads up to 100pF while maintaining >60° phase margin, and features matched internal amplifiers (A/B/C/D) with ≤1000µV channel-to-channel offset voltage match over temperature.
It operates across ±1.5V to ±5V dual supplies or 3V–12.6V single supplies, with CMRR and PSRR exceeding 90dB up to 10kHz. The device is specified for full performance at VCM = –3V to +4V under ±5V supplies, supporting wide common-mode input ranges required in precision sensor front-ends and active filter topologies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Noise Density | 1.1nV/√Hz at 10kHz - enables sub-100dB THD in 18-bit ADC drivers without added filtering |
| Gain-Bandwidth | 215MHz - supports closed-loop gains ≥10 at >20MHz signal bandwidth for fast settling |
| Slew Rate | 70V/µs - ensures <570ns settling to 18-bit (4ppm) accuracy for 2VP-P steps |
| Supply Current | 3.5mA per amplifier - allows four-channel precision amplification within 14mA total budget |
| Input Offset | 350µV max - maintains <0.01% gain error in 12-bit+ measurement paths |
| Output Swing | Within 50mV of rails at light load - maximizes dynamic range in 3.3V or 5V systems |
| Operating Temp | –40°C to +85°C - qualified for industrial and automotive cabin electronics |
Pinout & Package
LT6238IGN#PBF is housed in a 16-lead narrow plastic SSOP (GN package), 5.3mm × 6.2mm body, 0.635mm pitch, with exposed pad thermally connected to V–.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT A) | Amplifier A output | Low-impedance buffered output; drives ADC input or feedback network |
| 2 (–IN A) | Inverting input A | Differential pair input node; matched to +IN A for common-mode rejection |
| 3 (+IN A) | Non-inverting input A | High-impedance input; referenced to system ground or bias network |
| 4 (V+) | Positive supply rail | Accepts 3V–12.6V single or +5V in dual-supply configurations |
| 5 (+IN B) | Non-inverting input B | Independent input for second amplifier; electrically isolated from A/C/D |
| 6 (–IN B) | Inverting input B | Matched pair with +IN B; supports differential gain stages |
| 7 (OUT B) | Amplifier B output | Full-swing output; capable of sourcing/sinking 20mA into 100Ω loads |
| 8 (NC) | No connect | Not bonded; must remain unconnected per design specification |
| 9 (OUT D) | Amplifier D output | Identical performance to OUT A/B/C; supports multi-channel signal conditioning |
| 10 (–IN D) | Inverting input D | Part of matched quad topology; offset match ≤1000µV vs other channels |
| 11 (+IN D) | Non-inverting input D | Enables independent configuration of fourth amplifier without crosstalk |
| 12 (V–) | Negative supply rail | Connects to 0V (single supply) or –5V (dual supply); thermal pad tied here |
| 13 (+IN C) | Non-inverting input C | Third amplifier input; supports simultaneous 4-channel analog front-end |
| 14 (–IN C) | Inverting input C | Paired with +IN C; used in instrumentation or transimpedance configurations |
| 15 (OUT C) | Amplifier C output | Drives secondary ADC channel or active filter stage |
| 16 (NC) | No connect | Not bonded; no electrical function; leave floating |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Swings within 50mV of V+ and V– at 5mA load - preserves >96% of full-scale ADC range in 3.3V systems |
| Quad amplifier matching | Channel-to-channel offset match ≤1000µV - enables precise differential signal generation and rejection |
| Low 1/f noise corner | 180nVP-P (0.1Hz–10Hz) - critical for DC-coupled sensor interfaces and weigh-scale applications |
| Stable with capacitive loads | Operates with ≥100pF load without oscillation - simplifies anti-aliasing filter integration |
| Wide supply range | 3V to 12.6V single supply or ±1.5V to ±5V dual supply - supports legacy and low-power designs |
| High PSRR/CMRR | ≥90dB to 10kHz - rejects supply ripple and common-mode interference in noisy industrial environments |
Applications
| High-Speed SAR ADC Driver | Multi-Channel Precision Sensor Interface |
|---|---|
Use Scenario: Driving the LTC2389-18 18-bit, 2.5Msps SAR ADC in a data acquisition system sampling at 2kHz with –1dBFS input. IC Role / Device Role / Timing Role: LT6238IGN#PBF provides low-noise, fast-settling differential drive with 570ns 18-bit settling time and –116.8dB THD at 2kHz. Use Value: Enables full 18-bit ENOB without external buffering or calibration, reducing BOM count and layout complexity. | Use Scenario: Conditioning outputs from four synchronized load cells in an industrial weighing platform. IC Role / Device Role / Timing Role: Each of the four LT6238IGN#PBF amplifiers performs rail-to-rail instrumentation gain (G=100) with matched offset and noise. Use Value: Eliminates inter-channel gain/offset drift errors, achieving <±0.005% linearity across all four channels. |
| Active Anti-Aliasing Filter | Low-Noise Photodiode Transimpedance Amplifier |
Use Scenario: Implementing a 4-pole 1MHz Butterworth filter preceding a 10Msps ADC in medical ECG front-end. IC Role / Device Role / Timing Role: Two LT6238IGN#PBF amplifiers form Sallen-Key stages; remaining two provide buffer and level shift. Use Value: 215MHz GBW ensures filter passband flatness to 1MHz with <0.02dB ripple and minimal phase distortion. | Use Scenario: Converting photocurrent from a low-capacitance photodiode (5pF) in optical spectroscopy. IC Role / Device Role / Timing Role: One LT6238IGN#PBF configured as transimpedance amplifier with 1MΩ feedback resistor. Use Value: 1.1nV/√Hz noise density dominates over resistor noise, achieving 1.2pA/√Hz input-referred current noise at 10kHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad low-noise op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADA4898-4ARUZ | Higher 1.2nV/√Hz noise, 220MHz GBW, 28V/µs slew rate; requires ±5V min supply | Better for higher supply voltage (>±4V) systems needing lower distortion at >10MHz | Select when THD < –120dB at 10MHz is required and supply headroom permits |
| OPA4189IDR | Zero-drift architecture; 0.1µV/°C drift, 5.6nV/√Hz noise, 12MHz GBW, 1.5mA per amp | Superior DC precision but insufficient bandwidth for >1Msps SAR ADC driving | Prefer for DC-coupled strain gauge or thermocouple interfaces where offset drift dominates noise |
Compared with ADA4898-4ARUZ and OPA4189IDR, the LT6238IGN#PBF uniquely balances ultra-low noise, high speed, and low power in a single 16-pin SSOP - making it optimal for 16–18-bit SAR ADC front-ends operating from 3.3V or ±5V with tight thermal and space constraints.
Availability
LT6238IGN#PBF is available at Aetrix Electronics and suitable for high-precision data acquisition, industrial sensor signal conditioning, and medical instrumentation requiring stable component supply across extended temperature ranges.
Supply support for LT6238IGN#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, acquired Linear Technology in 2017 to strengthen precision amplifier and power management portfolios.
The LT6238IGN#PBF belongs to ADI's legacy Linear Technology precision op amp family, engineered specifically for high-resolution, high-speed data conversion systems where noise, settling time, and rail-to-rail output are critical.
FAQ
What is the maximum supply voltage rating for the LT6238IGN#PBF?
The LT6238IGN#PBF has an absolute maximum total supply voltage (V+ to V–) of 12.6V. It is fully specified for operation from 3V to 12.6V single supply or ±1.5V to ±5V dual supply. Exceeding 12.6V risks permanent damage per Absolute Maximum Ratings.
Does the LT6238IGN#PBF include an enable/shutdown feature like the LT6236?
No, the LT6238IGN#PBF does not include an ENABLE pin or shutdown functionality. That feature is exclusive to the single-amplifier LT6236 variant. The LT6238IGN#PBF is a fixed-operating quad op amp with continuous 3.5mA per amplifier supply current.
What is the guaranteed input offset voltage specification for LT6238IGN#PBF over its full operating temperature range?
For the LT6238IGN#PBF (industrial grade, –40°C to +85°C), the maximum input offset voltage is 650µV, as confirmed in the Electrical Characteristics table on page 6 of the datasheet under the "l" (–40°C to 85°C) column.
Can the LT6238IGN#PBF drive a 100Ω load while maintaining rail-to-rail output swing?
Yes - the LT6238IGN#PBF guarantees output swing within 500mV of each rail when sinking or sourcing 20mA (e.g., into 100Ω at ±5V). At lighter loads (5mA), swing improves to within 240mV/325mV of rails, preserving >90% of full-scale range.
Is the LT6238IGN#PBF pin-compatible with other members of the LT6236/LT6237/LT6238 family?
No - the LT6238IGN#PBF uses a unique 16-lead SSOP (GN) package with dedicated pins for four independent amplifiers. It is not pin-compatible with the 6-lead TSOT-23 LT6236 or 8-lead DFN/MSOP LT6237. Board layout must be designed specifically for the GN footprint.
LT6238IGN#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:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
LT6238IGN#PBF FAQ
1.How can I place an order for LT6238IGN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT6238IGN#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 LT6238IGN#PBF reliable?
The price and inventory of LT6238IGN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT6238IGN#PBF is usually 5 days.
3.What payment methods are accepted for LT6238IGN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT6238IGN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT6238IGN#PBF?
LT6238IGN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT6238IGN#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 LT6238IGN#PBF?
For technical support, including LT6238IGN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT6238IGN#PBF requirements.
6.How does Aetrix verify that LT6238IGN#PBF is sourced from the original manufacturer or authorized distributors?
All LT6238IGN#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 LT6238IGN#PBF meets industry standards.
7.What is the process for return or replacement of LT6238IGN#PBF?
All LT6238IGN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT6238IGN#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 LT6238IGN#PBF part is unused and in its original packaging.
Return procedure for LT6238IGN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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