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Analog Devices Inc. LT6237CDD#PBF
- Part No.:
- LT6237CDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT6237CDD#PBF.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:322
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Product details
Overview
LT6237CDD#PBF from Analog Devices (formerly Linear Technology) is a dual, low-noise, rail-to-rail output 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, operating from 3V to 12.6V supplies. Its 50mV rail-to-rail output swing maximizes dynamic range in low-voltage data acquisition systems.
For engineers reviewing the LT6237CDD#PBF datasheet, LT6237CDD#PBF pinout, LT6237CDD#PBF application, or LT6237CDD#PBF equivalent, key selection criteria include its verified 18-bit settling time (570ns), THD of –116.8dB at 2kHz, and guaranteed performance across 0°C to 70°C - critical for precision analog front-ends in medical instrumentation, test equipment, and industrial sensor signal chains.
Technical Context
The LT6237CDD#PBF implements a fully differential, unity-gain-stable voltage-feedback architecture with matched internal transistor pairs enabling tight channel-to-channel offset matching (≤600µV). Its low 1.1nV/√Hz noise floor is maintained up to 100kHz, and it achieves full-power bandwidth of 6.3MHz at ±5V supplies - directly supporting 2.5Msps 18-bit SAR converters like the LTC2389-18 without external filtering.
It features independent enable control per amplifier (ENABLE pin logic compatible with 0.3V low / V+–0.35V high thresholds), allowing dynamic power gating in multi-channel systems. The amplifier's output stage is designed for capacitive loads up to 100pF while maintaining stability and minimal overshoot, validated via series resistance and overshoot vs. load curves in the datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Noise Density | 1.1nV/√Hz at 10kHz - enables sub-18-bit ENOB in high-resolution ADC interfaces without added noise penalty |
| Gain-Bandwidth | 215MHz - supports stable unity-gain operation and preserves fast transient fidelity for wideband signals |
| Slew Rate | 70V/µs - ensures distortion-free reproduction of 4VP-P, 2MHz signals (required for 18-bit settling) |
| Supply Current | 3.5mA per amplifier - balances speed/noise performance with power efficiency in dual-channel designs |
| Rail-to-Rail Output | Swings within 50mV of rails at 20mA load - maximizes usable signal swing on 3.3V or ±2.5V supplies |
| Settling Time | 570ns to 18-bit (4ppm) for 2VP-P step - meets timing budget for 2.5Msps SAR ADC sampling windows |
| THD @ 2kHz | –116.8dB - minimizes harmonic contamination in audio and precision measurement applications |
Pinout & Package
LT6237CDD#PBF is housed in an 8-lead (3mm × 3mm) plastic DFN package with underside thermal pad connected to V–. Pin 1 is marked by a dot; the package is RoHS-compliant and lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT A) | Amplifier A output | Low-impedance buffered output capable of sourcing/sinking 20mA; rail-to-rail swing |
| 2 (–IN A) | Inverting input A | Differential input node with 2.9pF common-mode capacitance; matched to +IN A |
| 3 (+IN A) | Non-inverting input A | Differential input node with 2.9pF common-mode capacitance; matched to –IN A |
| 4 (V–) | Negative supply rail | Reference for both amplifiers; connects to thermal pad for improved θJA (43°C/W) |
| 5 (V+) | Positive supply rail | Accepts 3V to 12.6V total supply; powers both amplifiers and ENABLE logic |
| 6 (OUT B) | Amplifier B output | Independent output identical in specs and drive capability to OUT A |
| 7 (–IN B) | Inverting input B | Matched pair with +IN B; channel-to-channel offset match ≤600µV |
| 8 (+IN B) | Non-inverting input B | Matched pair with –IN B; supports fully differential input configurations |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low noise floor | 1.1nV/√Hz input voltage noise enables <1µV RMS integrated noise in 100kHz bandwidth - essential for 18-bit resolution preservation |
| 18-bit settling guarantee | 570ns to 4ppm (18-bit) for 2VP-P step - eliminates need for post-amplifier digital correction in high-speed data acquisition |
| Matched dual architecture | ≤600µV channel-to-channel input offset voltage match - enables precise differential signal conditioning without calibration |
| Rail-to-rail output stage | 50mV headroom at 20mA load on 3.3V supply - delivers >3.2VPP dynamic range, maximizing SNR in low-voltage systems |
| Wide supply flexibility | Operates from 3V single-ended to ±5V dual supplies - simplifies integration into mixed-signal systems with varying rail constraints |
Applications
| Medical ECG Signal Conditioning | High-Speed Data Acquisition Front-End |
|---|---|
Use Scenario: Amplifying microvolt-level biopotential signals from electrode arrays while rejecting 50/60Hz interference and preserving ST-segment fidelity. IC Role / Device Role / Timing Role: Dual-channel instrumentation amplifier front-end driving 18-bit SAR ADCs at 2.5Msps, with one channel for signal path and second for reference/feedback. Use Value: 1.1nV/√Hz noise and –116.8dB THD ensure ≥16.5 ENOB at 2kHz, meeting IEC 60601-2-51 diagnostic accuracy requirements. | Use Scenario: Digitizing fast transient waveforms from oscilloscopes, LCR meters, and automated test equipment requiring >100kSPS sustained throughput. IC Role / Device Role / Timing Role: Precision buffer and driver between anti-alias filter and LTC2389-18 ADC, delivering 570ns 18-bit settling to meet 390ns sampling aperture window. Use Value: 215MHz GBW and 70V/µs slew rate prevent slewing-induced distortion on 2VP-P, 2MHz steps - eliminating waveform fidelity loss. |
| Industrial Sensor Interface Module | Portable Precision Instrumentation |
Use Scenario: Conditioning outputs from strain gauges, RTDs, and piezoresistive sensors in PLC analog input modules operating over –40°C to 70°C. IC Role / Device Role / Timing Role: Dual op-amp performing programmable-gain amplification and low-pass filtering before multiplexed ADC conversion. Use Value: Guaranteed 0°C to 70°C operation with <450µV max input offset and 0.4µV/°C drift ensures <0.01%FS error across temperature without recalibration. | Use Scenario: Battery-powered handheld multimeters and portable spectrum analyzers requiring high DC accuracy and low power consumption. IC Role / Device Role / Timing Role: Low-noise, low-quiescent-current signal conditioner powering down unused channels via ENABLE pin during idle periods. Use Value: 3.5mA per amplifier active current and <10µA shutdown current extend battery life while maintaining 18-bit linearity and noise performance. |
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 1.05nV/√Hz noise but lower 1.2µV/°C offset drift; requires ±5V min supply; no ENABLE pin | Better DC stability over temperature, but lacks power-gating for portable use; not suitable for 3.3V-only systems | Select when ultra-low drift dominates over supply flexibility and power management needs |
| OPA211IDGKR | Lower 1.1nV/√Hz noise at 1kHz but degrades to 1.8nV/√Hz at 10kHz; 45MHz GBW limits 18-bit settling to >1.2µs | Superior low-frequency precision but insufficient bandwidth for 2.5Msps SAR ADC drivers | Select only for DC-coupled, low-bandwidth (<100kHz) precision applications where speed is secondary |
Compared with ADA4898-2ARMZ and OPA211IDGKR, the LT6237CDD#PBF uniquely combines 215MHz bandwidth, 570ns 18-bit settling, rail-to-rail output on 3.3V, and dual-channel ENABLE control - making it the only option qualified for high-speed, low-voltage, power-aware precision data acquisition.
Availability
LT6237CDD#PBF is available at Aetrix Electronics and suitable for medical instrumentation, industrial data loggers, and portable test equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing for ISO 13485 and IATF 16949 compliance.
Supply support for LT6237CDD#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 LT6237CDD#PBF belongs to ADI's legacy Linear Technology precision op amp portfolio, engineered specifically for high-fidelity signal chain applications demanding simultaneous low noise, high speed, and rail-to-rail output - especially SAR ADC driving and sensor interface tasks.
FAQ
What is the maximum supply voltage rating for the LT6237CDD#PBF?
The LT6237CDD#PBF has an absolute maximum total supply voltage (V+ to V–) of 12.6V. Operation beyond this limit risks permanent damage. For reliable long-term use, Analog Devices specifies a recommended maximum of 12V across the supply rails, with full parametric performance guaranteed from 3V to 12.6V under normal operating conditions. The LT6237CDD#PBF maintains rail-to-rail output swing and 1.1nV/√Hz noise density across this entire range.
Does the LT6237CDD#PBF support true rail-to-rail input common-mode range?
No, the LT6237CDD#PBF features rail-to-rail *output* but not rail-to-rail *input*. Its input common-mode voltage range is specified as 1.5V to 4V on 5V supplies and 1.15V to 2.65V on 3.3V supplies - limited by internal biasing. However, the LT6237CDD#PBF does guarantee CMRR ≥90dB across that range, and its 50mV output headroom enables full utilization of low-voltage ADC reference spans. Input overvoltage protection diodes allow safe operation beyond rails if current is limited to <40mA.
Can the LT6237CDD#PBF drive heavy capacitive loads without instability?
The LT6237CDD#PBF is stable driving up to 100pF capacitive loads with appropriate series output resistance (≥10Ω), as validated in the datasheet's "Series Output Resistance and Overshoot vs Capacitive Load" plots. Driving >100pF directly may cause peaking or ringing; for larger loads (e.g., ADC input capacitance + PCB trace), a small isolation resistor (10–22Ω) placed between LT6237CDD#PBF output and load restores phase margin. This behavior is consistent across all temperature grades including the C-grade LT6237CDD#PBF.
What is the typical enable/disable timing for the LT6237CDD#PBF?
The LT6237CDD#PBF exhibits a typical turn-on time (tON) of 800ns and turn-off time (tOFF) of 41µs when switching the ENABLE pin between 0V and V+, measured with RL = 1kΩ and VS = 5V. During disable, supply current drops to ≤10µA, and output enters high-impedance state with leakage <10µA. These timings are characterized for the C-grade LT6237CDD#PBF and remain stable across 0°C to 70°C ambient - critical for power-gated multi-channel acquisition systems.
How does the LT6237CDD#PBF compare to the LT6236 and LT6238 in terms of channel count and footprint?
The LT6237CDD#PBF is the dual-channel variant in the LT6236/LT6237/LT6238 family, packaged in an 8-lead 3mm × 3mm DFN. In contrast, the LT6236CDD#PBF is single-channel (6-lead TSOT-23), and the LT6238CGN#PBF is quad-channel (16-lead SSOP). All three share identical core specifications - 1.1nV/√Hz noise, 215MHz GBW, and 570ns 18-bit settling - enabling scalable channel density without performance trade-offs. The LT6237CDD#PBF thus offers optimal density for dual-sensor or differential-pair applications.
LT6237CDD#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:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x3)
LT6237CDD#PBF FAQ
1.How can I place an order for LT6237CDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT6237CDD#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 LT6237CDD#PBF reliable?
The price and inventory of LT6237CDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT6237CDD#PBF is usually 5 days.
3.What payment methods are accepted for LT6237CDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT6237CDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT6237CDD#PBF?
LT6237CDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT6237CDD#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 LT6237CDD#PBF?
For technical support, including LT6237CDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT6237CDD#PBF requirements.
6.How does Aetrix verify that LT6237CDD#PBF is sourced from the original manufacturer or authorized distributors?
All LT6237CDD#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 LT6237CDD#PBF meets industry standards.
7.What is the process for return or replacement of LT6237CDD#PBF?
All LT6237CDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT6237CDD#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 LT6237CDD#PBF part is unused and in its original packaging.
Return procedure for LT6237CDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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