LTC2245IUH - 14-Bit 10Msps Low Power ADC | Analog Devices
部品番号: LTC2245IUH ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $18.5 | $18.50 |
| 10 | $16.4 | $164.00 |
| 100 | $13.95 | $1,395.00 |
| 500 | $11.85 | $5,925.00 |
| 1,000 | $10.4 | $10,400.00 |
LTC2245IUH 概要
A pipelined ADC is a high-speed converter architecture that uses cascaded low-resolution flash stages to achieve high sampling rates with moderate power and die size. It sits inside the broader hierarchy: ADC -> data converter -> signal chain IC -> analog/mixed-signal semiconductor. Pipelined ADCs dominate 5-200 Msps applications where successive-approximation (SAR) ADCs cannot achieve the required throughput.
Key features include ±1 LSB INL (typical), ±0.5 LSB DNL (typical), no missing codes over temperature, 575 MHz full-power input bandwidth, single-ended/differential input range up to 2 Vp-p, clock duty cycle stabilizer, and shutdown/nap power-down modes. The flexible input supports both single-ended and differential drive, allowing direct coupling to IF/RF signals or baseband amplifiers.
The LTC2245IUH uses an internal sample-and-hold with 575 MHz bandwidth and a multi-stage pipelined core with proprietary error correction. The 32-QFN (UH) package exposes the die pad for low thermal resistance; total power dissipation is only 69 mW, enabling multi-channel data acquisition systems that cannot tolerate the heat of conventional 100+ Msps converters.
Typical applications include high-end imaging, ultrasound front-end digitization, communications IF sampling, and portable test-and-measurement instruments. The wide input bandwidth and low power make it especially suitable for handheld spectrum analyzers and battery-powered communication receivers where thermal budget is tight.
When designing with this device, place the analog input traces as short and symmetrical as possible, decouple the 3V supply with a 10 µF tantalum in parallel with 0.1 µF ceramic, and tie the exposed pad (pin 33) to a clean analog ground plane to minimize noise coupling.
This page synthesizes distributor pricing, drop-in 32-QFN alternatives, and practical layout guidance that are not collected in the manufacturer datasheet alone.
ドロップイン代替品: LTC2245IUH — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: LTC2245IUH （同一形状・フットプリント） — 相違点: Package, Resolution, Sample Rate, Input Type, Operating Temperature Range.
クイック比較ツール — 並列比較する代替部品を選択:
LTC2245CUH
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LTC2245IUH#PBF
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LTC2225CUH#PBF
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LTC2227IUH
✅ ドロップイン✓ 在庫あり
$9.05 / 個
データシートを見る →LTC2237IUH
✅ ドロップイン✓ 在庫あり
$10.95 / 個
データシートを見る →LTC2245IUH 最大定格＆電気的特性
| 分解能 | 14 bits |
| Sample Rate | 10 Msps |
| Architecture | Pipelined |
| 電源電圧 | 3 V (2.8 V to 3.4 V) |
| Power Consumption | 60 mW at 10 Msps |
| Power Dissipation | 69 mW max |
| SNR | 74.4 dB |
| SFDR | 90 dB |
| INL | ±1 LSB (typical) |
| DNL | ±0.5 LSB (typical) |
| Missing Codes | No missing codes over temperature |
| Full-Power Input Bandwidth | 575 MHz |
| Input Range | 1 Vp-p to 2 Vp-p (single-ended or differential) |
| Input Channels | 1 single-ended / differential |
| Digital Interface | Parallel |
| Shutdown / Nap Modes | Yes |
| Clock Duty Cycle Stabilizer | Yes |
| 動作温度 | -40C to +85C (industrial) |
| パッケージ | 32-pin QFN (5x5 mm) with exposed pad |
| 実装タイプ | Surface Mount |
| RoHS ステータス | Compliant (PBF suffix) |
LTC2245IUH ピン構成
| ピン 1 | GND — Analog ground |
| ピン 2 | SENSE — Reference sense pin |
| ピン 3 | VREF — Reference voltage bypass |
| ピン 4 | GND — Analog ground |
| ピン 5 | AIN+ — Differential analog input positive |
| ピン 6 | AIN- — Differential analog input negative |
| ピン 7 | GND — Analog ground |
| ピン 8 | GND — Analog ground |
| ピン 9 | OE — Output enable (active high) |
| ピン 10 | CLK — Clock input |
| ピン 11 | CLKOUT- — Complementary clock output |
| ピン 12 | CLKOUT+ — True clock output |
| ピン 13 | OGND — Output driver ground |
| ピン 14 | OVDD — Output driver supply |
| ピン 15 | D0 — Data output bit 0 (LSB) |
| ピン 16 | D1 — Data output bit 1 |
| ピン 17 | D2 — Data output bit 2 |
| ピン 18 | D3 — Data output bit 3 |
| ピン 19 | D4 — Data output bit 4 |
| ピン 20 | D5 — Data output bit 5 |
| ピン 21 | D6 — Data output bit 6 |
| ピン 22 | D7 — Data output bit 7 |
| ピン 23 | D8 — Data output bit 8 |
| ピン 24 | D9 — Data output bit 9 |
| ピン 25 | D10 — Data output bit 10 |
| ピン 26 | D11 — Data output bit 11 |
| ピン 27 | D12 — Data output bit 12 |
| ピン 28 | D13 — Data output bit 13 (MSB) |
| ピン 29 | OGND — Output driver ground |
| ピン 30 | SHDN — Shutdown mode control (active high) |
| ピン 31 | NAP — Nap mode control (active high) |
| ピン 32 | AVDD — Analog 3V supply |
| ピン 33 | EPAD — Exposed pad - tie to analog ground |
主な用途
LTC2245IUH の用途: 6 件s: Portable Ultrasound Imaging Front End, Communications IF Sampling, Handheld Spectrum Analyzer Digitizer, Industrial Non-Destructive Testing, High-End Imaging and Medical Diagnostic, Portable Test and Measurement.
Portable Ultrasound Imaging Front End
The LTC2245IUH is widely used in portable ultrasound imaging systems where the probe head must digitize multi-MHz IF signals with high dynamic range while remaining within tight thermal limits. Its 575 MHz full-power input bandwidth supports direct sampling of ultrasound IF frequencies well above the 5 MHz Nyquist band for this 10 Msps ADC, while 74.4 dB SNR and 90 dB SFDR provide clean B-mode and Doppler images. The 60 mW power consumption allows dense multi-channel probe head arrays that the higher-power 14-bit converters cannot support. Place the converter close to the LNA, decouple with a 10 µF tantalum + 0.1 µF ceramic, and drive the input differentially from a low-noise amplifier to leverage the full SFDR. Compared with 12-bit ultrasound ADCs, the LTC2245's 14-bit depth improves tissue contrast resolution and supports harmonic imaging modes.
おすすめ
Communications IF Sampling
The LTC2245IUH is well suited for direct IF sampling in software-defined radio and communications base stations, where the 575 MHz input bandwidth allows undersampling of 70-140 MHz IF signals from a cellular or microwave receiver. Its 90 dB SFDR means that strong interferers do not create spurious tones in the digitized output, and the 74.4 dB SNR provides the dynamic range needed for demodulating weak signals in the presence of nearby strong carriers. The flexible 1-2 Vp-p input range accommodates both single-ended and differential drive topologies. The parallel CMOS interface simplifies connection to an FPGA or DSP that performs channelization, demodulation, and decoding in real time. Power dissipation of 60 mW at 10 Msps keeps multi-channel receiver arrays within budget.
おすすめ
Handheld Spectrum Analyzer Digitizer
In handheld and portable spectrum analyzers, the LTC2245IUH serves as the final IF digitizer behind a mixer and anti-alias filter, capturing the swept IF signal at 10 Msps with 14-bit precision. Its low 60 mW consumption extends battery operating time, while the 575 MHz input bandwidth lets designers choose a higher IF frequency and reduce the analog filter complexity. The shutdown and nap modes enable aggressive duty-cycling between sweep acquisitions, dropping quiescent current to microampere levels. The 32-QFN footprint supports multi-IF architectures. Combined with a low-noise LNA and a low-jitter clock generator, the LTC2245IUH preserves spectral purity for spurious-free measurement of narrowband signals in field-test instruments.
おすすめ
Industrial Non-Destructive Testing
The LTC2245IUH is used in industrial non-destructive testing (NDT) systems such as eddy-current flaw detectors and ultrasonic thickness gauges that need high dynamic range at moderate sampling rates. Its 74.4 dB SNR enables detection of small flaw signatures buried in the return-signal noise floor, while the 90 dB SFDR prevents harmonic spurs from masking subtle defects. The industrial -40C to +85C temperature grade ensures stable operation in factory-floor environments with wide thermal variation. The shutdown and nap modes support battery-powered portable flaw detectors used in field inspection of pipelines, aircraft structures, and pressure vessels. The 5x5 mm 32-QFN package supports dense multi-channel probe head integration.
おすすめ
High-End Imaging and Medical Diagnostic
In high-end medical imaging such as digital radiography, confocal microscopy, and optical coherence tomography (OCT), the LTC2245IUH digitizes amplified detector signals with 14-bit resolution at 10 Msps. The 90 dB SFDR ensures that weak optical signals at the edge of the detector's dynamic range are not corrupted by harmonic spurs from strong central signals. The 60 mW power dissipation enables compact benchtop or portable imaging instruments that must operate from limited power budgets. The flexible single-ended or differential input configuration simplifies interface to photodiode transimpedance front ends. Industrial exposure is rated for -40C to +85C, suitable for clinical and laboratory imaging environments.
おすすめ
Portable Test and Measurement
The LTC2245IUH is a strong fit for portable oscilloscope, data-acquisition, and waveform-recorder products that need 14-bit accuracy at 10 Msps in a small, low-power package. Its 60 mW power consumption and shutdown/nap modes allow battery-powered instruments to capture long-duration transient events with minimal standby drain. The 575 MHz input bandwidth supports wideband signal capture beyond the Nyquist band, while the 32-QFN footprint keeps the analog front end compact. The flexible 1-2 Vp-p input range allows direct connection to standard 50-ohm or 1-Mohm scope probes with appropriate attenuation. The industrial -40C to +85C temp grade ensures reliable operation in field-test and laboratory environments.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: LTC2245IUH — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | LTC2245CUH | LTC2245IUH#PBF | LTC2225CUH#PBF | LTC2227IUH | LTC2237IUH |
|---|---|---|---|---|---|---|
| Package | 32-QFN (5x5 mm) | 32-QFN (5x5) - same | 32-QFN (5x5) - same | 32-QFN (5x5) - same | 32-QFN (5x5) - same | 32-QFN (5x5) - same |
| Brand | Analog Devices (formerly Linear Technology) | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 14 bits | 14 bits | 14 bits | 12 bits (-2) | 12 bits (-2) | 10 bits (-4) |
| Sample Rate | 10 Msps | 10 Msps | 10 Msps | 10 Msps | 40 Msps (+4x) | 40 Msps (+4x) |
| SNR | 74.4 dB | 74.4 dB | 74.4 dB | approx 65 dB | approx 64 dB | approx 60 dB |
| Power Consumption | 60 mW | 60 mW | 60 mW | approx 55 mW | approx 120 mW | approx 120 mW |
| Temperature Grade | -40C to +85C (industrial) | 0C to +70C (commercial) | -40C to +85C (industrial) | 0C to +70C (commercial) | -40C to +85C (industrial) | -40C to +85C (industrial) |
| RoHS / PBF | Industrial grade - PBF suffix indicates RoHS | Check distributor listing for PBF suffix | RoHS (lead-free) | RoHS (lead-free) | Check distributor listing for PBF suffix | Check distributor listing for PBF suffix |
主な差別化要因
- Lowest-power 14-bit/10 Msps ADC in 32-QFN family （vs LTC2227IUH (12-bit/40 Msps))
- Higher SNR than lower-resolution family members （vs LTC2237IUH (10-bit/40 Msps))
- Higher-resolution alternative to 12-bit LTC2225 （vs LTC2225CUH#PBF (12-bit/10 Msps))
- Industrial temperature grade available （vs LTC2245CUH (commercial grade))
設計ノート
Keep analog input traces as short and symmetric as possible to minimize distortion and channel-to-channel skew in differential operation. Decouple the 3V AVDD supply with a 10 µF tantalum in parallel with a 0.1 µF ceramic placed within 2 mm of the AVDD pin, and decouple the OVDD output supply separately to prevent digital switching noise from coupling back into the analog front end. According to the 2245fa datasheet, the analog and digital ground planes should join at a single point near the exposed pad (pin 33) to avoid ground loops.
Avoid running digital output traces directly beneath the analog input traces or the exposed pad - this couples high-edge-rate CMOS switching noise into the sensitive 1-2 Vp-p input stage. Always tie the exposed pad (pin 33) to a clean analog ground plane with multiple thermal vias; failing to solder the exposed pad increases thermal resistance and can cause junction-temperature-induced linearity errors. The shutdown (SHDN) and nap (NAP) pins must be tied to GND if unused - leaving them floating can cause indeterminate logic levels and unexpected power-down behavior.
Drive the LTC2245IUH with a low-jitter clock source - the SNR/SFDR performance at high input frequencies is directly limited by clock jitter. Use a clock generator with < 1 ps rms jitter (e.g. a clean crystal oscillator or a dedicated clock synthesizer). For differential clock drive, use a small RF balun or clock buffer to convert a single-ended CMOS clock to differential levels. The internal clock duty-cycle stabilizer relaxes the duty-cycle requirement to 30-70%, simplifying clock routing on the PCB.
The 3V supply should be derived from a low-noise LDO (e.g. ADP3330 or LT1763) rather than directly from a switching converter to avoid coupling switching noise into the ADC. In portable/battery applications, take advantage of the shutdown (SHDN) and nap (NAP) modes to drop quiescent current to microampere levels between conversion bursts. The 60 mW typical power dissipation rises 1W at 3.4V AVDD if the supply is operated at the maximum rating, so a clean regulated 3.0-3.3V supply is recommended.
コンプライアンス情報
RoHS and lead-free compliance indicated by #PBF suffix per Analog Devices (formerly Linear Technology) part numbering convention. AEC-Q100 not applicable for this commercial/industrial grade ADC - contact Analog Devices automotive products division for AEC-Q100 qualified alternatives.