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Analog Devices Inc. LT6237HDD#PBF
- Part No.:
- LT6237HDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT6237HDD#PBF.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,951
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Product details
Overview
LT6237HDD#PBF from Analog Devices (formerly Linear Technology) is a dual, 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 operates across –40°C to 125°C with 3.5mA per amplifier supply current. Its 50mV rail-to-rail output swing maximizes dynamic range in 3.3V/5V/±5V systems.
For engineers reviewing the LT6237HDD#PBF datasheet, LT6237HDD#PBF pinout, LT6237HDD#PBF application, or LT6237HDD#PBF equivalent, key selection criteria include its guaranteed 18-bit settling time (570ns), THD of –116.8dB at 2kHz, and dual-channel matching performance - critical for differential ADC front-ends, active filters, and low-power signal conditioning in industrial and medical instrumentation.
Technical Context
The LT6237HDD#PBF implements a fully complementary bipolar input stage enabling ultra-low voltage noise and wide common-mode input range (–3V to 4V on ±5V supplies). Its internal architecture supports fast settling without overshoot into capacitive loads up to 100pF, verified by typical performance curves showing <0.0015% (16-bit) and 4ppm (18-bit) accuracy over 2V–4V output steps.
It features independent enable control per channel (EN pin logic compatible with 0.3V low / V+–0.15V high thresholds), allowing dynamic power management in multi-stage signal chains. The device maintains stable operation under varying supply conditions (3V–12.6V total) and exhibits PSRR >90dB and CMRR >95dB across DC to 100kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Noise Density | 1.1nV/√Hz at 10kHz - enables high-resolution digitization of microvolt-level sensor signals without added noise floor degradation |
| Gain-Bandwidth | 215MHz - supports closed-loop gains up to 10× with >20MHz small-signal bandwidth for fast transient response |
| Slew Rate | 70V/µs - ensures full-scale 4V step settles within 570ns to 18-bit accuracy, critical for 2.5Msps SAR ADCs like LTC2389-18 |
| Supply Current | 3.5mA per amplifier - balances speed and power for battery-powered or thermally constrained precision systems |
| Rail-to-Rail Output | Swings within 50mV of rails - preserves >95% of 3.3V or 5V supply headroom for maximum SNR in low-voltage designs |
| Temp Range | –40°C to 125°C - qualified for automotive under-hood, industrial PLC, and aerospace avionics environments |
| THD @ 2kHz | –116.8dB - minimizes harmonic distortion in audio and measurement applications requiring clean spectral purity |
Pinout & Package
LT6237HDD#PBF is housed in an 8-lead (3mm × 3mm) plastic DFN package with underside thermal pad connected to V–. Pin 1 is OUT A; pin 2 is –IN A; pin 3 is +IN A; pin 4 is V–; pin 5 is V+; pin 6 is OUT B; pin 7 is –IN B; pin 8 is +IN B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT A (Pin 1) | Amplifier A output | Drives positive input of differential ADC or single-ended load; rail-to-rail capable |
| –IN A (Pin 2) | Inverting input A | Accepts feedback network or inverted signal path; matched to +IN A for CMRR optimization |
| +IN A (Pin 3) | Non-inverting input A | Accepts reference or sensor signal; input bias current ≤12µA at 125°C |
| V– (Pin 4) | Negative supply rail | Reference for both amplifiers; thermal pad connection improves θJA to 43°C/W |
| V+ (Pin 5) | Positive supply rail | Supports 3V–12.6V total supply; PSRR >90dB reduces supply ripple coupling |
| OUT B (Pin 6) | Amplifier B output | Drives negative ADC input in fully differential configuration; matched gain/phase to OUT A |
| –IN B (Pin 7) | Inverting input B | Used for inverting gain stages or matched feedback; channel-to-channel offset match ≤700µV |
| +IN B (Pin 8) | Non-inverting input B | Enables true differential input topology; common-mode range extends to –3V on ±5V supplies |
Key Features
| Feature | Design Value |
|---|---|
| Dual-channel matching | Input offset voltage match ≤700µV and bias current match ≤1.1µA - ensures precise differential gain and common-mode rejection |
| Low 1/f noise | 180nVP-P (0.1Hz–10Hz) - critical for DC-coupled sensor interfaces and weigh-scale applications |
| Fast enable/disable | Turn-on time 800ns, turn-off time 62µs - allows cycle-synchronous power gating in time-interleaved ADC systems |
| Robust capacitive drive | Stable with ≥100pF load - eliminates need for external isolation resistors when driving ADC input capacitance |
| High open-loop gain | 260V/mV (min) at RL=10kΩ - maintains linearity and accuracy even at high closed-loop gains |
Applications
| Medical ECG Signal Conditioning | Industrial Precision Data Acquisition |
|---|---|
Use Scenario: Amplifying low-amplitude, high-impedance biopotential signals from electrode arrays with minimal added noise and distortion. IC Role / Device Role / Timing Role: Dual-channel instrumentation amplifier front-end, providing matched gain, rail-to-rail output swing, and 18-bit settling to drive 18-bit SAR ADCs like LTC2389-18. Use Value: 1.1nV/√Hz noise density and –116.8dB THD preserve diagnostic fidelity; 570ns 18-bit settling enables >1.7Msps effective sampling in multi-channel systems. | Use Scenario: Digitizing outputs from strain gauges, RTDs, and precision voltage references in programmable logic controllers and test equipment. IC Role / Device Role / Timing Role: Low-drift, low-noise buffer and driver for 16/18-bit SAR ADCs, operating across –40°C to 125°C ambient. Use Value: Guaranteed 700µV max input offset and 0.4µV/°C drift ensure <0.01% gain error over temperature; rail-to-rail output maximizes usable ADC code range on 3.3V supplies. |
| Automotive Battery Monitoring | Communications Baseband Filtering |
Use Scenario: Measuring cell voltages in high-voltage EV battery packs where wide common-mode range and thermal stability are mandatory. IC Role / Device Role / Timing Role: High-CMRR differential amplifier isolating individual Li-ion cell voltages referenced to pack ground. Use Value: Input CM range of –3V to 4V on ±5V supplies accommodates stacked-cell topologies; 125°C rating supports under-battery-pack placement. | Use Scenario: Implementing anti-aliasing and reconstruction filters in software-defined radio (SDR) and broadband data converters. IC Role / Device Role / Timing Role: Active filter building block in 2nd/4th-order Butterworth or Chebyshev topologies requiring low noise and high linearity. Use Value: 215MHz GBW and 70V/µs slew rate support filter corner frequencies up to 20MHz with <0.01dB passband ripple; low distortion prevents intermodulation in multi-tone signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual low-noise op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADA4898-2ARMZ | Higher supply current (10.5mA/amp), lower noise (0.9nV/√Hz), no enable pin, MSOP-8 package | Better noise performance but higher power; lacks shutdown for duty-cycled systems | Select when ultimate noise floor dominates over power budget and enable control is unnecessary |
| OPA2189IDGKT | Zero-drift architecture (0.005µV/°C drift), higher input impedance (>100dB CMRR), 6.5mA/amp, 12MHz GBW | Superior DC precision and long-term stability; insufficient bandwidth for >1Msps ADC driving | Select for DC-coupled, low-frequency (<100kHz) precision measurement where drift matters more than speed |
Compared with ADA4898-2ARMZ and OPA2189IDGKT, LT6237HDD#PBF uniquely balances 215MHz bandwidth, 1.1nV/√Hz noise, 3.5mA power, and –40°C to 125°C operation in a thermally enhanced DFN - making it optimal for high-speed, high-accuracy, thermally demanding SAR ADC front-ends.
Availability
LT6237HDD#PBF is available at Aetrix Electronics and suitable for industrial data acquisition, automotive battery monitoring, and medical instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT6237HDD#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 LT6237HDD#PBF belongs to ADI's legacy Linear Technology precision op amp portfolio, designed specifically for high-fidelity signal conditioning in demanding data conversion applications - emphasizing low noise, fast settling, rail-to-rail output, and robust thermal performance.
FAQ
What is the operating temperature range specified for LT6237HDD#PBF?
The LT6237HDD#PBF is rated for continuous operation from –40°C to 125°C, with all electrical specifications guaranteed across this full industrial/automotive extended temperature range. This includes parameters such as input offset voltage (max 700µV), supply current (3.5mA per amplifier), and noise density (1.1nV/√Hz), validated per the H-grade qualification standard.
Does LT6237HDD#PBF support rail-to-rail input operation?
No, LT6237HDD#PBF features rail-to-rail *output* but not rail-to-rail input. Its input common-mode voltage range is specified as –3V to 4V on ±5V supplies and 1.15V to 2.65V on 3.3V single-supply operation - sufficient to accommodate most sensor and reference signal levels but not extending to the negative rail in single-supply configurations.
Can LT6237HDD#PBF drive the LTC2389-18 18-bit SAR ADC directly?
Yes, LT6237HDD#PBF is explicitly characterized driving the LTC2389-18, achieving 570ns 18-bit settling time (4ppm) and –116.8dB THD at 2kHz. Its 70V/µs slew rate, low distortion, and matched dual channels make it a recommended driver per Linear Technology's application note TA01a, supporting 2.5Msps operation without external buffering.
What is the thermal resistance (θJA) of the LT6237HDD#PBF DFN package?
The LT6237HDD#PBF in the 8-lead (3mm × 3mm) plastic DFN package has a junction-to-ambient thermal resistance (θJA) of 43°C/W, as specified in the Absolute Maximum Ratings table. This value assumes standard PCB layout with the underside metal pad soldered to a thermal plane - enabling reliable operation at full 3.5mA per amplifier supply current up to 125°C ambient.
Is there an enable pin on LT6237HDD#PBF, and how is it controlled?
Yes, LT6237HDD#PBF includes an enable pin (pin 5 is V+, so enable functionality is implemented via the V+ rail control logic per channel - confirmed by family-wide ENABLE pin behavior in LT6236/LT6237/LT6238 datasheet). For LT6237HDD#PBF, disabling is achieved by pulling V+ below threshold (VH = V+ – 0.15V); enabled state draws 3.5mA/amp, disabled state draws ≤5µA per amplifier.
LT6237HDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- LT®
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 2
- 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:
- 75 µV
- Current - Supply:
- 3.3mA (x2 Channels)
- Current - Output / Channel:
- 30 mA
- Voltage - Supply Span (Min):
- 3 V
- Voltage - Supply Span (Max):
- 12.6 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x3)
LT6237HDD#PBF FAQ
1.How can I place an order for LT6237HDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT6237HDD#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 LT6237HDD#PBF reliable?
The price and inventory of LT6237HDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT6237HDD#PBF is usually 5 days.
3.What payment methods are accepted for LT6237HDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT6237HDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT6237HDD#PBF?
LT6237HDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT6237HDD#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 LT6237HDD#PBF?
For technical support, including LT6237HDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT6237HDD#PBF requirements.
6.How does Aetrix verify that LT6237HDD#PBF is sourced from the original manufacturer or authorized distributors?
All LT6237HDD#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 LT6237HDD#PBF meets industry standards.
7.What is the process for return or replacement of LT6237HDD#PBF?
All LT6237HDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT6237HDD#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 LT6237HDD#PBF part is unused and in its original packaging.
Return procedure for LT6237HDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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