LTC6226IDC - 420MHz GBW Low Noise RRIO Op Amp | ADI
MPN： LTC6226IDC ✓ 啟用中LTC6226IDC 概覽
What is an op amp? An operational amplifier is a high-gain DC-coupled analog building block used in signal conditioning, filtering, and feedback loops. Rail-to-rail output (RRIO) op amps extend the output swing to within millivolts of either supply rail, maximizing dynamic range on low-voltage supplies. The LTC6226 belongs to the precision/high-speed amplifier sub-family, which sits between general-purpose op amps and fully-dedicated high-speed current-feedback amplifiers in the analog IC hierarchy.
Key features of the LTC6226IDC include 420MHz gain-bandwidth product, 180V/us slew rate, 1nV/sqrt(Hz) input voltage noise density, less than -90dBc THD at 1MHz/4Vp-p, rail-to-rail output swing, and unity-gain stability. The part runs from a 2.8V to 11.75V total supply (or +/-1.4V to +/-5.875V dual) and draws approximately 5.5mA of quiescent current. The exposed-pad DFN-6 package keeps the thermal resistance low for continuous high-output-current operation.
The internal architecture uses a complementary bipolar input stage followed by a rail-to-rail class-AB output stage. The very low input noise density makes the LTC6226IDC well suited for photodiode transimpedance amplifiers and ultrasound front-ends where the signal-to-noise ratio is dominated by the front-end amplifier's own voltage noise rather than its current noise.
Typical applications for the LTC6226IDC include 16-bit to 20-bit ADC drivers, photodiode transimpedance amplifiers, ultrasound preamplifiers, active filters, video line drivers, and low-noise instrumentation front-ends. The combination of low noise, high GBW, and rail-to-rail output makes it a strong fit for single-supply industrial data-acquisition systems.
When designing with this op amp, decouple the supply pins with a 0.1uF X7R ceramic capacitor placed as close as possible to the V+ and V- pins, plus a bulk 10uF tantalum or ceramic capacitor. The exposed pad must be soldered to a copper pour to keep junction temperature within datasheet limits at high output swing and high load current.
This page consolidates distributor pricing, drop-in alternatives, and practical design notes that are not always easy to find in the manufacturer datasheet.
直接替換替代品，適用於 LTC6226IDC — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： LTC6226IDC （相同外形與佔位） — 差異在於 Amplifier Type, Manufacturer, Package, Slew Rate.
LTC6226IDC#TRMPBF
✅ 直接替換📋 參考替代品（不在目錄中）
LTC6226IDC#TRPBF
✅ 直接替換📋 參考替代品（不在目錄中）
LTC6226HS6#TRMPBF
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →LTC6226IS8#PBF
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
LTC6226HS8#PBF
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
LTC6226IDC 最大額定值與電氣特性
| Manufacturer | Analog Devices |
| Part Family | LTC6226 |
| Amplifier Type | Operational Amplifier - Single, Low Noise, RRIO |
| Number of Channels | 1 |
| Gain Bandwidth Product | 420 MHz |
| Slew Rate | 180 V/us |
| Input-Referred Voltage Noise | 1 nV/sqrt(Hz) |
| Distortion (THD) | -90 dBc at 1 MHz, 4 Vp-p |
| 輸出類型 | Rail-to-Rail |
| Input Offset Voltage | 20 uV (max, per Xecor listing) |
| Supply Current (per channel) | 5.5 mA |
| Output Current per Channel | 64 mA |
| Supply Voltage Range (Single) | 2.8 V to 11.75 V |
| Supply Voltage Range (Dual) | +/-1.4 V to +/-5.875 V |
| 工作溫度 | -40 C to +85 C (I grade, per LCSC/Xecor) |
| 安裝類型 | Surface Mount |
| 封裝 | 6-DFN (2 mm x 2 mm) with exposed pad |
| Gain Stability | Unity Gain Stable |
LTC6226IDC 腳位配置
| 腳位 1 | OUT — Amplifier output |
| 腳位 2 | V- — Negative supply (or GND in single-supply) |
| 腳位 3 | IN+ — Non-inverting input |
| 腳位 4 | V+ — Positive supply |
| 腳位 5 | IN- — Inverting input |
| 腳位 6 | NC — Not connected (per datasheet) |
典型應用
LTC6226IDC 適用於 6 應用s: 16-bit / 18-bit ADC Driver, Photodiode Transimpedance Amplifier, Ultrasound / Medical Imaging Front-End, Active Filter / Equalizer, Low-Noise Instrumentation Front-End, Video Line Driver / Buffer.
16-bit / 18-bit ADC Driver
The LTC6226IDC's 420MHz GBW and 180V/us slew rate let it settle a 16-bit ADC step inside the acquisition window, while 1nV/sqrt(Hz) input voltage noise preserves ADC SNR on low-level inputs. Placed between the sensor signal chain and the ADC input, it adds less than -90dBc THD at 1MHz/4Vp-p, so the noise floor is set by the ADC rather than the driver. On a 5V single supply its rail-to-rail output maximizes the input span to the ADC's full-scale range. Estimated: with 1nV/sqrt(Hz) at 10MHz closed-loop bandwidth the integrated noise is roughly 100uVrms, well below the LSB of a 16-bit ADC at 5V full-scale (76uV).
推薦
Photodiode Transimpedance Amplifier
The LTC6226IDC's 1nV/sqrt(Hz) input voltage noise makes it well-suited as a photodiode transimpedance amplifier, especially where the diode capacitance is high enough that the amplifier's voltage noise dominates total SNR. Its 420MHz GBW supports transimpedance bandwidths of several MHz at moderate gains (e.g. 10k to 100k ohm feedback). The exposed-pad DFN-6 allows the part to be placed close to the photodiode, minimizing stray capacitance that would otherwise limit bandwidth.
推薦
Ultrasound / Medical Imaging Front-End
Ultrasound receivers need wide dynamic range and low noise at 1MHz to 20MHz carrier frequencies; the LTC6226IDC delivers both, with 1nV/sqrt(Hz) input voltage noise and -90dBc THD at 1MHz/4Vp-p. The part is unity-gain stable, so it can directly drive the ADC after time-gain compensation. The exposed-pad DFN-6 keeps thermal rise low under continuous pulsed operation, important for clinical imaging arrays. Industrial supply compliance (5V or +/-5V) eases integration into existing ultrasound carts.
推薦
Active Filter / Equalizer
At 420MHz GBW, the LTC6226IDC supports active filters with cutoffs above 10MHz while maintaining low distortion, useful in video equalization and wideband IF chains. Its rail-to-rail output maximizes dynamic range on 5V rails. The 5.5mA quiescent current allows several op amps in parallel without overwhelming the supply budget; the DFN-6 footprint makes dense filter banks (Sallen-Key, multiple-feedback) layout-friendly.
推薦
Low-Noise Instrumentation Front-End
The LTC6226IDC's combination of low noise (1nV/sqrt(Hz)), high GBW (420MHz), and unity-gain stability makes it a strong fit for the I-to-V conversion stage of strain-gauge, thermocouple, or bridge-sensor front-ends. Its 20uV max input offset voltage (per Xecor listing) keeps calibration offsets small. The part accepts +/-5V dual supplies, simplifying the design of bridges biased around ground.
推薦
Video Line Driver / Buffer
Driving 75-ohm video lines from a 5V single supply requires low distortion and rail-to-rail output swing; the LTC6226IDC delivers less than -90dBc THD at 1MHz/4Vp-p with output swing within tens of millivolts of either rail. Its 64mA output current drives doubly-terminated video loads (150 ohm total) with full signal amplitude. The DFN-6 package keeps the part small for multi-channel video distribution amplifiers.
推薦
推薦產品摘要
工程參考資料，適用於 LTC6226IDC — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | LTC6226IDC#TRMPBF | LTC6226IDC#TRPBF | LTC6226HS6#TRMPBF | LTC6226IS8#PBF | LTC6226HS8#PBF |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 6-DFN (2x2) | 6-DFN (2x2) - same | 6-DFN (2x2) - same | 6-DFN (2x2) - same package per data | SOIC-8 (different footprint) | SOIC-8 (different footprint) |
| Gain Bandwidth Product | 420 MHz | 420 MHz | 420 MHz | 420 MHz | 420 MHz | 420 MHz |
| Slew Rate | 180 V/us | 180 V/us | 180 V/us | 180 V/us | 180 V/us | 180 V/us |
| Input Voltage Noise | 1 nV/sqrt(Hz) | 1 nV/sqrt(Hz) | 1 nV/sqrt(Hz) | 1 nV/sqrt(Hz) | 1 nV/sqrt(Hz) | 1 nV/sqrt(Hz) |
| Supply Voltage Range | 2.8 V to 11.75 V | 2.8 V to 11.75 V | 2.8 V to 11.75 V | 2.8 V to 11.75 V | 2.8 V to 11.75 V | 2.8 V to 11.75 V |
| Quiescent Current (typ) | 5.5 mA | 5.5 mA | 5.5 mA | 5.5 mA | 5.5 mA | 5.5 mA |
主要差異化特點
- Lowest noise floor in a 420MHz GBW RRIO op amp (對比LTC6226IS8#PBF (same die, SOIC-8))
- Faster slew rate than most low-noise op amps (對比LTC6226HS8#PBF (same die, HS8 SOIC))
- Wide supply voltage headroom for industrial designs (對比LTC6226HS6#TRMPBF (same die, HS6 SO-8))
設計說明
Decouple each supply pin with a 0.1uF X7R ceramic capacitor placed within 3mm of the V+ and V- pins, plus a bulk 10uF ceramic or tantalum capacitor on the supply trace. According to the LTC6226 datasheet, inadequate decoupling can degrade THD by 10-20dB above 1MHz because the rail-to-rail output stage draws large transient currents during slewing.
Solder the exposed pad (pin 6 / paddle) of the LTC6226IDC to a copper pour on the PCB; do not leave it floating. At 5.5mA quiescent current and 11.75V supply the part dissipates roughly 65mW internally. Without the thermal pad the junction temperature can rise 20-30C above ambient, which is acceptable but reduces the safety margin for hot-spot transients during heavy load driving.
Keep input traces short and guard the inverting-input trace with a ground trace to minimize leakage and stray capacitance. Estimated: 5pF of stray capacitance at the inverting input with 10k ohm feedback resistance adds a pole at ~3MHz, which can destabilize the loop or trigger peaking above the intended closed-loop bandwidth. Use a ground plane on layer 2 for best results.
The LTC6226 is unity-gain stable but does not tolerate unlimited capacitive load. According to the datasheet, sustained capacitive loads above ~200pF at the output may cause ringing in unity-gain buffer mode. Insert a 25-50 ohm isolation resistor between the output and the load if driving long cables or large filter capacitors.
For ADC driver applications, place the LTC6226IDC within 10mm of the ADC input and avoid running the analog signal trace parallel to digital switching lines. According to the datasheet, the part's low 1nV/sqrt(Hz) input noise can be swamped by digital switching noise if the layout is poor; a small RC filter (10 ohm + 100pF) at the output can also reduce ADC sample-glitch kickback.
合規資訊
RoHS and lead-free per ADI product page; AEC-Q100 not applicable as the part is specified for industrial (I grade) use, not automotive.
