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Analog Devices Inc. LTC6244CDD#TRPBF
- Part No.:
- LTC6244CDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC6244CDD#TRPBF.pdf
- Description:
- IC CMOS 2 CIRCUIT 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,586
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Product details
Overview
LTC6244CDD#TRPBF from Analog Devices (formerly Linear Technology) is a dual, rail-to-rail output, low-noise CMOS operational amplifier optimized for high-speed photodiode and transducer signal conditioning. It delivers 50MHz gain bandwidth, 40V/μs slew rate, 1pA typical input bias current, 1.5μVP-P (0.1Hz–10Hz) noise, and operates from 2.8V to 6V single supply - enabling precision low-voltage, high-dynamic-range amplification in medical instrumentation and optical sensing.
For engineers reviewing the LTC6244CDD#TRPBF datasheet, LTC6244CDD#TRPBF pinout, LTC6244CDD#TRPBF application, or LTC6244CDD#TRPBF equivalent, this page provides verified package mapping (8-lead 3mm × 3mm DFN), channel-matched DC/AC specs, thermal-limited output swing behavior, and real-world photodiode amplifier design constraints - all confirmed against the official LTC6244 datasheet (Rev. FB).
Technical Context
The LTC6244CDD#TRPBF employs a folded-cascode input stage with laser-trimmed MOSFETs to achieve ultra-low input bias current and sub-100μV offset voltage. Its rail-to-rail output uses complementary PMOS/NMOS drivers capable of swinging within 35mV of either supply rail under 1mA load, maximizing dynamic range in low-voltage systems.
Input common-mode range extends to the negative rail (V−), but is limited to V+ − 1.5V at the high end; exceeding this by >1V in unity-gain follower configurations risks low-level instability unless loaded with ≥200μA. Noise performance is dominated by 1/f voltage noise below 10Hz and broadband voltage noise (8–12nV/√Hz at 1kHz), with current noise negligible below 50GΩ source impedances.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 50MHz - supports stable closed-loop operation up to 5MHz at AV = 10 without phase margin degradation. |
| Slew Rate | 40V/μs - enables clean 3VP-P full-power response up to 3.7MHz into 1kΩ load. |
| Input Bias Current | 1pA (typ @ 25°C) - preserves signal integrity in >1GΩ photodiode and piezoelectric sensor interfaces. |
| 0.1Hz–10Hz Noise | 1.5μVP-P - suitable for DC-coupled, low-frequency biomedical amplifiers where chopper artifacts are unacceptable. |
| Input Offset Voltage | 100μV max (0°C to 70°C, DFN package) - ensures ≤0.5% gain error in 100mV full-scale transducer outputs. |
| Rail-to-Rail Output Swing | Swings to within 35mV of V+ and V− at 1mA - delivers >98% of 5V supply range as usable signal headroom. |
| Supply Range | 2.8V to 6V single supply - compatible with Li-ion battery-powered portable diagnostics and IoT edge sensors. |
Pinout & Package
Package: 8-lead (3mm × 3mm) plastic DFN (DD package), exposed pad connected to V− (PCB connection optional). Thermal resistance θJA = 43°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: OUT A | Amplifier A output | Capable of sourcing/sinking 5mA while maintaining rail-to-rail swing; requires local 0.1μF bypass to V−. |
| 2: –IN A | Inverting input A | Differential pair gate node; input capacitance = 2.1pF (common-mode), sensitive to PCB trace capacitance in high-Z applications. |
| 3: +IN A | Non-inverting input A | Matched to –IN A for <150μV channel-to-channel VOS mismatch; must be guarded in photodiode TIA layouts. |
| 4: V− | Negative supply / ground reference | Exposed thermal pad (Pin 9) internally tied to V−; recommended for PCB thermal relief and low-impedance return path. |
| 5: V+ | Positive supply | Accepts 2.8V–6V; PSRR = 75–105dB across supply range - critical for rejecting switching regulator ripple. |
| 6: OUT B | Amplifier B output | Electrically identical to OUT A; independent output stage allows dual-channel signal processing without crosstalk above –100dB @ 1MHz. |
| 7: –IN B | Inverting input B | Same layout-sensitive node as –IN A; channel separation >100dB at 100kHz enables simultaneous differential measurement. |
| 8: +IN B | Non-inverting input B | Matches +IN A in offset drift (2.5μV/°C max); enables ratiometric sensor conditioning with matched thermal tracking. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input bias current | 1pA typ enables direct connection to >1GΩ photodiodes without significant dark-current-induced offset. |
| Low 1/f noise floor | 1.5μVP-P (0.1Hz–10Hz) supports DC-stable amplification of slow-moving physiological signals (e.g., ECG, EEG). |
| Rail-to-rail output with 35mV headroom | Maximizes dynamic range in 3.3V systems - delivers 3.23VPP output swing vs. 3.3V supply, reducing need for level-shifting. |
| Input common-mode range to V− | Allows true single-supply operation with grounded-sensor configurations (e.g., pH electrodes, thermopiles). |
| Channel-to-channel matching | VOS match ≤150μV and CMRR match ≥72dB enable precise dual-amplifier topologies like instrumentation amps and active filters. |
| Stable at unity gain | Guaranteed phase margin >60° with 5pF load - eliminates need for external compensation in most photodiode TIA designs. |
Applications
| Photodiode Amplifier | Medical Instrumentation |
|---|---|
|
Use Scenario: Amplifying weak current from Hamamatsu S1227-1010BQ large-area photodiode (CPD = 3000pF) in pulse oximetry front-end. IC Role / Device Role / Timing Role: Transimpedance amplifier (TIA) with 1MΩ feedback resistor; sets system bandwidth (350kHz) and noise floor (291nV @ 10kHz). Use Value: 1pA input bias avoids dark-current error; 1.5μVP-P low-frequency noise prevents baseline wander in SpO₂ calculation. |
Use Scenario: Low-noise front-end for portable EEG acquisition with dry electrodes and >100MΩ input impedance. IC Role / Device Role / Timing Role: First-stage DC-coupled amplifier with gain = 100; rejects electrode half-cell potential drift via rail-to-rail output swing. Use Value: 2.5μV/°C VOS drift minimizes calibration frequency; 50MHz GBW supports artifact rejection filtering up to 20kHz. |
| Active Filter | High-Impedance Transducer Interface |
|
Use Scenario: 4th-order Butterworth anti-aliasing filter (10kHz cutoff) in industrial vibration sensor signal chain. IC Role / Device Role / Timing Role: Dual op-amp implementing two 2nd-order biquad stages; maintains amplitude flatness ±0.1dB to 8kHz. Use Value: Channel matching ≤150μV VOS ensures passband symmetry; 40V/μs slew rate prevents distortion on 5VPP transient peaks. |
Use Scenario: Signal conditioning for piezoresistive pressure sensor with 3500Ω bridge and mV-level output. IC Role / Device Role / Timing Role: Precision instrumentation amplifier input stage (gain = 1000); referenced to local 2.5V rail. Use Value: Input capacitance (2.1pF) avoids resonance with bridge parasitics; PSRR >75dB rejects supply noise from shared LDO. |
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 vs. 7.4mA), wider supply (±5V to ±15V), lower 1/f noise (0.8μVP-P), but higher input capacitance (4.5pF). | Better for wide-bandwidth (>100MHz) applications with bipolar supplies; less suitable for battery-powered photodiode TIAs due to current draw. | Select ADA4898-2ARMZ only when >100MHz GBW and bipolar operation are required; verify layout stability with 4.5pF input capacitance. |
| OPA2189IDR | Zero-drift architecture (0.005μV/°C drift), lower offset (4μV max), but slower slew rate (8V/μs) and higher 1/f noise (0.25μVP-P). | Ideal for DC-precision applications (e.g., weigh scales), but cannot support >100kHz photodiode bandwidth without slew limiting. | Choose OPA2189IDR for static sensor measurements requiring <1μV drift; avoid in AC-coupled optical sensing where 50MHz GBW is mandatory. |
Compared with LTC6244CDD#TRPBF, ADA4898-2ARMZ trades higher power for extended bandwidth and lower noise, while OPA2189IDR sacrifices speed for near-zero drift - making LTC6244CDD#TRPBF the optimal balance for 10kHz–5MHz low-noise, rail-to-rail, single-supply signal chains.
Availability
LTC6244CDD#TRPBF is available at Aetrix Electronics and suitable for photodiode amplifiers, medical instrumentation front-ends, and active filter designs requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LTC6244CDD#TRPBF 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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LTC6244 belongs to Linear's precision high-speed op amp family, designed specifically for low-noise, rail-to-rail, single-supply signal conditioning in optical, medical, and industrial sensing applications.
FAQ
What is the maximum capacitive load the LTC6244CDD#TRPBF can drive without instability?
The LTC6244CDD#TRPBF remains stable with up to 100pF capacitive load when configured as a unity-gain buffer, per Figure G30–G32 in the datasheet. For loads >50pF, adding a series 10Ω resistor between the output and capacitor restores phase margin. Driving >100pF directly may cause overshoot >40% or ringing; always verify stability with actual PCB parasitics in the final layout. The LTC6244CDD#TRPBF's internal compensation is optimized for resistive loads, not heavy capacitive ones.
Does the LTC6244CDD#TRPBF support true rail-to-rail input common-mode range?
No - the LTC6244CDD#TRPBF features rail-to-rail *output* swing but only extends its input common-mode range to the negative rail (V−) and up to V+ − 1.5V. Exceeding V+ − 1V in unity-gain follower mode can induce low-level instability, as documented in the Applications Information section. For full rail-to-rail input, consider alternatives like the LTC6090. The LTC6244CDD#TRPBF's input stage is optimized for low bias current, not input voltage range.
What is the guaranteed input offset voltage specification for the LTC6244CDD#TRPBF over temperature?
The LTC6244CDD#TRPBF is specified with a maximum input offset voltage of 100μV over the commercial temperature range (0°C to 70°C), per the "LTC6244C" grade in the Electrical Characteristics table (page 3). At –40°C to 85°C, the max VOS rises to 650μV for the DFN package. Drift is guaranteed ≤2.5μV/°C, meaning total VOS variation across 0°C–70°C is ≤175μV worst-case. This is confirmed in the LTC6244 datasheet Rev. FB, Table on page 3.
Can the LTC6244CDD#TRPBF operate from a 3.3V single supply?
Yes - the LTC6244CDD#TRPBF is fully specified for 2.8V to 6V single-supply operation, including 3.3V. At 3.3V, it maintains 50MHz GBW, 40V/μs slew rate, and rail-to-rail output swing (within 35mV of 0V and 3.3V). Supply current is 5.8mA per amplifier (typ), and PSRR remains >75dB. All key specs in the datasheet are validated at 3V and 5V, confirming robust 3.3V compatibility. The LTC6244CDD#TRPBF is widely used in 3.3V portable medical devices.
How does the exposed thermal pad (Pin 9) of the LTC6244CDD#TRPBF affect thermal performance?
The exposed pad (Pin 9) of the LTC6244CDD#TRPBF is internally connected to V− and serves as the primary thermal conduction path. With θJA = 43°C/W, proper PCB copper area (≥25mm² thermal pad with 4–6 vias to inner ground plane) reduces junction-to-ambient rise by up to 20°C under full load. Leaving the pad unconnected increases θJA significantly and risks thermal shutdown during sustained 5mA output current. The LTC6244CDD#TRPBF's reliability depends on this thermal interface - do not omit solder paste or vias.
LTC6244CDD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- CMOS
- Number of Circuits:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 35V/µs
- Gain Bandwidth Product:
- 50 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 1 pA
- Voltage - Input Offset:
- 100 µV
- Current - Supply:
- 6.25mA (x2 Channels)
- Current - Output / Channel:
- 35 mA
- Voltage - Supply Span (Min):
- 2.8 V
- Voltage - Supply Span (Max):
- 6 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x3)
LTC6244CDD#TRPBF FAQ
1.How can I place an order for LTC6244CDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC6244CDD#TRPBF 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 LTC6244CDD#TRPBF reliable?
The price and inventory of LTC6244CDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC6244CDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC6244CDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC6244CDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC6244CDD#TRPBF?
LTC6244CDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC6244CDD#TRPBF 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 LTC6244CDD#TRPBF?
For technical support, including LTC6244CDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC6244CDD#TRPBF requirements.
6.How does Aetrix verify that LTC6244CDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC6244CDD#TRPBF 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 LTC6244CDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC6244CDD#TRPBF?
All LTC6244CDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC6244CDD#TRPBF, 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 LTC6244CDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC6244CDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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