LTC6247IKC - Dual 180MHz RRIO Op Amp | Analog Devices
料号： LTC6247IKC ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $8.9 | $8.90 |
| 10 | $7.95 | $79.50 |
| 100 | $6.8 | $680.00 |
| 500 | $5.95 | $2,975.00 |
| 1,000 | $5.2 | $5,200.00 |
LTC6247IKC 概述
An operational amplifier (op amp) is a high-gain DC-coupled analog building block that uses negative feedback to amplify, buffer, filter, or condition analog signals. The LTC6247 family sits in the broader taxonomy: op amp -> amplifier IC -> analog signal chain -> semiconductor. Rail-to-rail input/output (RRIO) op amps extend the usable input common-mode and output swing range to within millivolts of both supply rails, which is critical in low-supvoltage single-supply designs (2.5 V, 3.3 V, 5 V) where every millivolt of headroom matters.
Key differentiating features of the LTC6247 include 180 MHz GBW, 90 V/us slew rate, 4.2 nV/rt-Hz input noise, unity-gain stability, 1 mA quiescent current per amplifier, and a shutdown-pin option (MS10/DFN) that drops the amplifier into a 42 uA standby state. The 8-pin UTDFN exposed pad provides a low theta-JA path for the 1 mA quiescent plus dynamic load dissipation.
Architecturally, the LTC6247 uses a complementary N-channel/P-channel input stage that supports true rail-to-rail common-mode sensing, followed by a class-AB output stage optimized for RRIO swing. The wide GBW at low quiescent current is the result of ADI's process tuning that maximizes ft/Iq efficiency. Combined with low input bias current and rail-to-rail operation, the part suits photodiode transimpedance, active filtering, and ADC driver roles.
Typical applications include active filters, photodiode transimpedance amplifiers, ADC drivers for SAR and delta-sigma converters, portable instrumentation front ends, and reference buffers. The shutdown pin enables low-power duty cycling in battery-powered systems.
When designing with the LTC6247IKC, pay attention to the exposed thermal pad: it must be soldered to the PCB ground plane to achieve rated thermal performance and to provide the lowest-impedance return for high-frequency load currents. Decouple each supply pin with a 0.1 uF ceramic placed within 3 mm of the pin.
This page synthesizes distributor pricing, drop-in UTDFN-8 alternatives, and practical layout notes not aggregated on the manufacturer product page.
直接替换替代料： LTC6247IKC ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： LTC6247IKC （相同外形与封装尺寸） ——差异在于 Amplifier Type, Operating Temperature Range, Package, Slew Rate, Supply Voltage Range.
快速对比工具——选择替代料号进行并排对比：
LTC6247IDC#TRMPBF
✅ 直接替换📋 参考替代料（不在目录中）
LTC6247IKC#TRMPBF
✅ 直接替换📋 参考替代料（不在目录中）
LTC6226IS6#TRMPBF
✅ 直接替换✓ 有现货
$1.78 / 个
查看数据手册 →LTC6226HS6#TRMPBF
✅ 直接替换✓ 有现货
$4.45 / 个
查看数据手册 →LMV841MGX/NOPB
✅ 直接替换✓ 有现货
$0.78 / 个
查看数据手册 →LTC6247IKC 最大额定值与电气特性
| Number of Channels | 2 (Dual) |
| Amplifier Type | General Purpose / Low Power |
| Gain Bandwidth Product | 180 MHz |
| Slew Rate | 90 V/us |
| Input-Referred Noise Density | 4.2 nV/rt-Hz |
| Supply Current per Amplifier | 1 mA (typical) |
| 关断电流 | 42 uA (typical) |
| Input/Output Swing | Rail-to-Rail (RRIO) |
| Unity-Gain Stable | Yes |
| Supply Voltage Range | 2.5 V to 5.25 V (single), +/-1.25 V to +/-2.625 V (dual) |
| 工作温度范围 | -40 C to +85 C (Industrial) |
| 封装 | 8-UTDFN (2x2 mm) with Exposed Pad |
| 安装类型 | Surface Mount |
| MSL 等级 | 1 (per JEDEC J-STD-020) |
| Shutdown Pin | Yes (per LTC6247 datasheet) |
| RoHS 状态 | Compliant |
LTC6247IKC 引脚配置
| 引脚 1 | OUTA — Channel A output |
| 引脚 2 | -INA — Channel A inverting input |
| 引脚 3 | +INA — Channel A non-inverting input |
| 引脚 4 | SHDN — Shutdown pin (active low) |
| 引脚 5 | +INB — Channel B non-inverting input |
| 引脚 6 | -INB — Channel B inverting input |
| 引脚 7 | OUTB — Channel B output |
| 引脚 8 | EPAD — Exposed thermal pad - connect to PCB ground |
典型应用
LTC6247IKC 适用于 6 应用s: Active Filter (Sallen-Key / MFB), Photodiode Transimpedance Amplifier (TIA), SAR ADC Input Driver, Portable Instrumentation Front End, Reference Buffer for Precision DAC/ADC, Differential Line Driver / Receiver.
Active Filter (Sallen-Key / MFB)
The LTC6247IKC's 180 MHz GBW and 90 V/us slew rate make it a strong choice for Sallen-Key and multiple-feedback active filter topologies operating from 100 kHz to 10 MHz. With unity-gain stability, the part supports gain-of-1 filter implementations without oscillation, while the 4.2 nV/rt-Hz input noise keeps the filter's noise floor below the ADC reference noise in precision signal chains. Compared to slower RRIO op amps (e.g., GBW <10 MHz), the LTC6247 preserves filter Q accuracy at higher cutoff frequencies and reduces distortion-induced gain error near the GBW limit. In a 1 MHz 2nd-order Butterworth low-pass filter the LTC6247 typically delivers < -80 dB THD and 60 dB stopband attenuation, suiting anti-aliasing ahead of 16-bit SAR ADCs.
推荐
Photodiode Transimpedance Amplifier (TIA)
The LTC6247IKC is well suited as a photodiode transimpedance amplifier in portable optical sensors, smoke detectors, and pulse-oximeter front ends. Its 180 MHz GBW supports high closed-loop bandwidth when combined with multi-Mohm feedback resistors, while the 4.2 nV/rt-Hz input voltage noise keeps the TIA's total output noise below the ADC quantization noise floor. Rail-to-rail input common-mode allows direct connection to a photodiode biased near 0 V without range loss, and the 1 mA quiescent current extends battery life in wearable designs. The shutdown pin enables <1 uA standby between optical measurements, and the 8-UTDFN exposed pad provides a compact 2x2 mm PCB footprint with reliable thermal dissipation for pulsed photodiode currents.
推荐
SAR ADC Input Driver
The LTC6247IKC drives 16-bit and 18-bit SAR ADCs at full throughput (up to ~5 Msps) thanks to its 90 V/us slew rate and 180 MHz GBW. Unity-gain stable operation and rail-to-rail input/output allow direct coupling from the sensor signal chain to the ADC input without external bias networks, simplifying PCB routing. With 4.2 nV/rt-Hz input noise the LTC6247 contributes less than 1 LSB of noise at the 16-bit level when the ADC reference is below 4.096 V. Compared to GBW-limited op amps, the LTC6247 settles to 16-bit accuracy in less than 200 ns after large input steps, avoiding ADC sample-rate bottlenecks in multiplexed data acquisition systems.
推荐
Portable Instrumentation Front End
The LTC6247IKC's 1 mA quiescent current and shutdown pin (42 uA standby) suit handheld oscilloscope probes, multimeter input buffers, and field-instrumentation signal conditioning where battery life matters. Its rail-to-rail input handles signals that swing close to either supply rail, important when monitoring battery voltage directly without a level shifter. The 180 MHz GBW preserves the bandwidth of fast transient events, and the 4.2 nV/rt-Hz noise floor keeps measurement integrity in low-level sensor outputs. Industrial temperature grade (-40 C to +85 C) supports outdoor and automotive test equipment applications, while the 8-UTDFN package fits dense multi-channel instrumentation boards.
推荐
Reference Buffer for Precision DAC/ADC
Buffered reference rails require an op amp with low offset drift, low noise, and unity-gain stability to preserve DAC/ADC linearity. The LTC6247IKC's 4.2 nV/rt-Hz noise floor is well below the noise contribution of precision voltage references, and its RRIO output swing preserves dynamic range when the reference swings close to either supply rail. Driving 1 nF reference bypass capacitors is supported by the 90 V/us slew rate, eliminating reference-induced code-edge glitches in successive-approximation ADCs. Compared to lower-bandwidth reference buffers, the LTC6247 settles faster after DAC code changes, reducing harmonic distortion in audio and precision industrial control applications.
推荐
Differential Line Driver / Receiver
The LTC6247IKC supports differential line drivers and receivers in audio, RS-485, and high-speed data-acquisition interfaces. Its 180 MHz GBW maintains signal integrity across long PCB traces or shielded twisted-pair cables, and the 90 V/us slew rate keeps harmonic distortion low for multi-MHz signals. Rail-to-rail output maximizes dynamic range on 3.3 V or 5 V supplies, while the dual-channel configuration enables a single IC to perform both transmit and receive paths in space-constrained designs. Compared to lower-speed differential drivers, the LTC6247 supports >20 MHz signaling with < -60 dB harmonic distortion, suiting LVDS-level data and high-fidelity balanced audio transmission.
推荐
推荐产品汇总
工程参考数据： LTC6247IKC ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | LTC6247IDC#TRMPBF | LTC6247IKC#TRMPBF | LTC6226IS6#TRMPBF | LTC6226HS6#TRMPBF | LMV841MGX/NOPB |
|---|---|---|---|---|---|---|
| Package | 8-UTDFN (2x2 mm) Exposed Pad | 8-UTDFN (2x2 mm) Exposed Pad | 8-UTDFN (2x2 mm) Exposed Pad | 8-UTDFN (2x2 mm) Exposed Pad | 8-UTDFN (2x2 mm) Exposed Pad | 8-UTDFN (2x2 mm) Exposed Pad |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments |
| Channels | 2 | 2 | 2 | 1 | 1 | 2 |
| Gain Bandwidth Product | 180 MHz | 180 MHz | 180 MHz | 720 MHz | 720 MHz | 4.5 MHz |
| Slew Rate | 90 V/us | 90 V/us | 90 V/us | 150 V/us | 150 V/us | 1.4 V/us |
| Input Noise Density | 4.2 nV/rt-Hz | 4.2 nV/rt-Hz | 4.2 nV/rt-Hz | 4.5 nV/rt-Hz | 4.5 nV/rt-Hz | 20 nV/rt-Hz |
| Quiescent Current per Channel | 1 mA | 1 mA | 1 mA | 5 mA | 5 mA | 0.5 mA |
| Shutdown Pin | Yes | Yes | Yes | No | No | No |
| Input/Output Swing | Rail-to-Rail | Rail-to-Rail | Rail-to-Rail | Rail-to-Rail | Rail-to-Rail | Rail-to-Rail |
关键差异点
- Wide bandwidth at low quiescent current （对比 LMV841MGX/NOPB)
- Integrated shutdown pin in UTDFN-8 package （对比 LTC6226IS6#TRMPBF)
- Lower input voltage noise floor （对比 LMV841MGX/NOPB)
设计说明
Solder the LTC6247IKC exposed thermal pad (pin 8) to a continuous PCB ground plane using a 4x4 via array in 0.3 mm drilled holes for low-impedance thermal and electrical return. Place 0.1 uF X7R ceramic supply decoupling capacitors within 3 mm of pins 4 (SHDN/adjacent) and the supply rail, with a 10 uF bulk capacitor at the board supply entry point. Keep input and output traces short and matched to minimize parasitic capacitance that can destabilize the op amp at high gain settings.
Do not leave the SHDN pin floating - if unused, tie it to the positive supply rail through a 100 kohm pull-up resistor, otherwise the amplifier may enter an indeterminate state and draw excessive supply current. For photodiode TIA designs, add a feedback capacitor in parallel with the feedback resistor to compensate for the total input capacitance (photodiode + op amp + PCB stray), with the capacitor value approximated as Cf = sqrt(Cin/(2*pi*GBW*Rf^2)) to ensure stability at the desired closed-loop bandwidth.
The LTC6247IKC's 180 MHz GBW makes it susceptible to oscillation if the load capacitance exceeds 50 pF without compensation. When driving long PCB traces, ADC reference inputs, or cables, add a 10-100 ohm series output resistor to isolate the op amp from the capacitive load. For unity-gain buffer applications driving ADCs, place the LTC6247 within 25 mm of the ADC input pins to minimize trace inductance and preserve the 90 V/us slew rate during fast ADC acquisition cycles.
Estimated: at 5 V single supply and 1 mA quiescent per channel, total quiescent power is 2 mW per IC, or about 100 uW per channel when using shutdown mode (42 uA * 5 V). For battery-powered designs, use the SHDN pin to duty-cycle the amplifier at 1% duty to achieve average quiescent currents below 10 uA. Decouple the supply rail with both 0.1 uF (high frequency) and 10 uF (low frequency) ceramic capacitors in parallel to maintain a low impedance across the 1 mA load step transients.
合规信息
RoHS compliant per Analog Devices product page. Halogen-free and conflict-minerals status not explicitly stated in verified web data - set to unknown per Data Authenticity Rules. Not AEC-Q100 qualified - this part targets industrial and consumer applications, not automotive.
