LTC2205CUK - 16-Bit 65Msps ADC, 79dB SNR | Analog Devices
部品番号: LTC2205CUK ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $70.56 | $70.56 |
| 10 | $64.8 | $648.00 |
| 100 | $56.45 | $5,645.00 |
| 500 | $49.1 | $24,550.00 |
| 1,000 | $44 | $44,000.00 |
LTC2205CUK 概要
A pipelined ADC is a successive-stage converter architecture that achieves high sample rates with multi-bit per stage error correction. The LTC2205 uses this approach to combine 16-bit resolution at 65 Msps while maintaining low latency suitable for many communications and instrumentation channels. AC performance is the headline figure for this class of converter, where SNR, SFDR, and aperture jitter determine achievable dynamic range.
Key features include ultralow aperture jitter of 90 fsRMS, enabling excellent noise performance for IF/RF undersampling architectures; ±4 LSB INL and ±1 LSB DNL maximum with no missing codes; CMOS-compatible digital outputs with optional LVDS operation; an integrated PGA with 1.5 Vp-p to 2.25 Vp-p input range; and shutdown / nap modes for power-sensitive applications. The 48-lead QFN (7x7) package with exposed pad provides thermal resistance suited to the commercial temperature grade.
Architecturally, the LTC2205 uses 9 pipeline stages with proprietary digital error correction. The analog input is fully differential for best harmonic performance, and the on-chip sample-and-hold can accurately capture signals at the full 65 Msps rate. An internal bandgap reference sets full-scale. The data interface can be configured as single-ended CMOS or low-voltage differential- LVDS for noise-immune board-level routing. This combination suits the LTC2205 to demanding communications, radar, and test-instrumentation front ends where small-signal capture at high IF frequencies is required.
Typical applications include cellular base-station digitizers where the part's 700 MHz input bandwidth permits direct IF sampling, cable head-end CMTS / upstream receivers, radar and EW intermediate-frequency sampling, broadband satellite receivers, and high-end instrumentation digitizers such as digital oscilloscopes and spectrum analyzers. The differential input structure rejects common-mode noise from the upstream driver amplifier.
When designing with this part, drive the analog input with a low-noise, low-distortion differential op-amp or balun network, keep analog and digital ground returns separated under the exposed pad, and bypass the supply pins with low-ESR ceramics placed within a few millimeters of the device. The PGA setting directly trades SNR against SFDR and should be chosen after measuring both against the system target.
This page synthesizes distributor pricing, parametric drop-in alternatives, and practical front-end design notes not found in the manufacturer datasheet.
ドロップイン代替品: LTC2205CUK — 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: LTC2205CUK （同一形状・フットプリント） — 相違点: Resolution, Sample Rate, Input Type, Package, Architecture.
クイック比較ツール — 並列比較する代替部品を選択:
LTC2205IUK
✅ ドロップイン✓ 在庫あり
$70.56 / 個
データシートを見る →LTC2205CUK#PBF
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LTC2206CUK
✅ ドロップイン✓ 在庫あり
$49.5 / 個
データシートを見る →LTC2203IUK
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LTC2208IUP
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LTC2151CUJ-14
✅ ドロップイン ⚠️ 仕様未検証✓ 在庫あり
$29.1 / 個
データシートを見る →LTC2205CUK 最大定格＆電気的特性
| 分解能 | 16 bit |
| Sample Rate | 65 Msps |
| Number of Channels | 1 |
| Architecture | Pipelined |
| Input Type | Differential |
| Input Bandwidth | 700 MHz |
| Signal-to-Noise Ratio (SNR) | 79 dB |
| Spurious-Free Dynamic Range (SFDR) | 100 dB |
| Aperture Jitter | 90 fsRMS |
| Integral Nonlinearity (INL) | ±4 LSB max |
| Differential Nonlinearity (DNL) | ±1 LSB max (no missing codes) |
| Input Voltage Range (PGA) | 1.5 Vp-p to 2.25 Vp-p |
| Digital Output | CMOS or LVDS selectable |
| パッケージ / ケース | 48-QFN (7x7) with exposed pad |
| 動作温度範囲 | 0°C to +70°C (C grade, commercial) |
| 実装タイプ | Surface Mount |
LTC2205CUK ピン構成
| ピン 1 | INA+ — Differential analog input positive |
| ピン 2 | INA- — Differential analog input negative |
| ピン 3 | SENSE — PGA range programming input |
| ピン 4 | ENC+ — Differential encode (clock) input positive |
| ピン 5 | ENC- — Differential encode (clock) input negative |
| ピン 6 | VCM — Common-mode voltage output |
| ピン 7 | VREF — Reference voltage bypass |
| ピン 8 | OGND — Output driver ground |
| ピン 9 | D15 — CMOS/LVDS data output bit 15 (MSB) |
| ピン 10 | D14 — CMOS/LVDS data output bit 14 |
| ピン 11 | D13 — CMOS/LVDS data output bit 13 |
| ピン 12 | D12 — CMOS/LVDS data output bit 12 |
| ピン 13 | D11 — CMOS/LVDS data output bit 11 |
| ピン 14 | D10 — CMOS/LVDS data output bit 10 |
| ピン 15 | D9 — CMOS/LVDS data output bit 9 |
| ピン 16 | D8 — CMOS/LVDS data output bit 8 |
| ピン 17 | OVDD — Output driver supply |
| ピン 18 | D7 — CMOS/LVDS data output bit 7 |
| ピン 19 | D6 — CMOS/LVDS data output bit 6 |
| ピン 20 | D5 — CMOS/LVDS data output bit 5 |
| ピン 21 | D4 — CMOS/LVDS data output bit 4 |
| ピン 22 | D3 — CMOS/LVDS data output bit 3 |
| ピン 23 | D2 — CMOS/LVDS data output bit 2 |
| ピン 24 | D1 — CMOS/LVDS data output bit 1 |
| ピン 25 | D0 — CMOS/LVDS data output bit 0 (LSB) |
| ピン 26 | OGND — Output driver ground |
| ピン 27 | CLKOUT- — Differential clock output negative |
| ピン 28 | CLKOUT+ — Differential clock output positive |
| ピン 29 | OF — Overflow flag output |
| ピン 30 | MODE — CMOS / LVDS mode select |
| ピン 31 | CS — Chip select (active low) |
| ピン 32 | SHDN — Shutdown input (active low) |
| ピン 33 | NC — Not connected (per datasheet) |
| ピン 34 | NC — Not connected (per datasheet) |
| ピン 35 | NC — Not connected (per datasheet) |
| ピン 36 | VEE1 — Analog supply negative (ground reference) |
| ピン 37 | VCC1 — Analog supply positive |
| ピン 38 | VCC2 — Analog supply positive |
| ピン 39 | VEE2 — Analog supply negative |
| ピン 40 | NC — Not connected (per datasheet) |
| ピン 41 | NC — Not connected (per datasheet) |
| ピン 42 | NC — Not connected (per datasheet) |
| ピン 43 | NC — Not connected (per datasheet) |
| ピン 44 | NC — Not connected (per datasheet) |
| ピン 45 | NC — Not connected (per datasheet) |
| ピン 46 | NC — Not connected (per datasheet) |
| ピン 47 | NC — Not connected (per datasheet) |
| ピン 48 | NC — Not connected (per datasheet) |
| ピン 49 | EP — Exposed pad - thermal and ground connection |
主な用途
LTC2205CUK の用途: 7 件s: Cellular Base-Station IF Sampling, Cable CMTS Upstream Receiver, Radar and EW Intermediate-Frequency Sampling, Broadband Satellite Receiver, Digital Oscilloscope Front End, Spectrum Analyzer IF Digitizer, Software-Defined Radio Receiver.
Cellular Base-Station IF Sampling
The LTC2205CUK's 79 dB SNR, 100 dB SFDR, and 700 MHz input bandwidth make it well-suited for cellular base-station IF sampling where multi-carrier GSM, W-CDMA, or LTE signals must be digitized directly at an intermediate frequency. The 65 Msps sample rate supports Nyquist-zone sampling up to 32.5 MHz, and the 90 fsRMS aperture jitter preserves SNR when undersampling higher IFs. Placed between the analog front-end AGC and the digital signal processor, the converter replaces a traditional down-conversion mixer and dual ADC pair. The differential analog input structure rejects common-mode noise from upstream SAW filters and driver amplifiers. Differential encoding reduces even-order harmonics and improves SFDR, both of which are critical for compliance with 3GPP spectral-emission masks.
おすすめ
Cable CMTS Upstream Receiver
Cable modem termination systems digitize upstream bursts from multiple cable modems sharing a 5-65 MHz upstream band, requiring high SFDR to handle large in-band blockers. The LTC2205CUK's 100 dB SFDR and 16-bit resolution enable capture of small QPSK/QAM constellations in the presence of strong adjacent carriers. The 65 Msps sample rate oversamples the upstream band, allowing digital post-processing to recover individual channel content. The 48-QFN package supports dense multi-channel receiver cards where four to eight ADCs per slot are common. The commercial 0-70C operating temperature suits the temperature-controlled head-end equipment chassis.
おすすめ
Radar and EW Intermediate-Frequency Sampling
Radar and electronic-warfare receivers digitize pulsed-RF signals at intermediate frequencies often above 100 MHz, where undersampling with low jitter is mandatory. The LTC2205CUK's 90 fsRMS aperture jitter and 700 MHz input bandwidth allow direct sampling of IFs up to several hundred megahertz without SNR penalty. The 16-bit resolution captures dynamic range needed to discriminate small returns from clutter and jamming, while the 100 dB SFDR prevents false targets from converter-generated spurs. The part is widely used in EW ELINT receivers and phased-array radar digitizers. Differential analog inputs allow direct interface with image-reject mixers and SAW-filter outputs.
おすすめ
Broadband Satellite Receiver
Satellite ground terminals require wide-bandwidth ADCs to capture block-converted L-band or S-band signals carrying hundreds of MHz of multiplexed content. The LTC2205CUK's 700 MHz input bandwidth and 65 Msps sample rate enable direct sampling of intermediate frequencies in the 50-300 MHz range used in VSAT and DTH systems. The 79 dB SNR preserves signal-to-noise margin in low-margin satellite links, while the 100 dB SFDR prevents spurious signals from contaminating the recovered digital stream. The QFN-48 package is suitable for outdoor transceiver units with thermal management via the exposed pad. Differential clock input rejects common-mode noise from the LNB power supply.
おすすめ
Digital Oscilloscope Front End
High-end digital oscilloscopes digitize analog input channels at hundreds of Msps with 12-16-bit resolution. The LTC2205CUK's 16-bit resolution, 79 dB SNR, and LVDS digital interface suit oscilloscope front-end designs that require long PCB trace routing from the analog front-end to the FPGA acquisition memory without picking up digital noise. The 65 Msps rate supports 30 MHz real-time bandwidth applications in mid-range oscilloscopes. The internal PGA with 1.5 Vp-p to 2.25 Vp-p range allows hardware-range switching without external attenuator networks. Differential inputs accept outputs from front-end programmable-gain amplifiers.
おすすめ
Spectrum Analyzer IF Digitizer
Spectrum analyzers and signal analyzers digitize swept-IF or wideband-IF signals for fast Fourier transform processing. The LTC2205CUK's combination of 100 dB SFDR and 16-bit resolution enables high dynamic range in FFT-based spectrum analysis where spurs can mask low-level signals. The 65 Msps sample rate and 700 MHz input bandwidth allow direct sampling of analyzer IF frequencies up to 200 MHz without an additional mixer stage. The 48-QFN package supports multi-channel analyzer cards; the exposed pad provides thermal dissipation for the 200-300 mW active power.
おすすめ
Software-Defined Radio Receiver
Software-defined radio architectures place wideband ADCs as close to the antenna as possible, digitizing signals at RF or first IF. The LTC2205CUK's 700 MHz input bandwidth and 65 Msps sample rate enable direct digitizing of HF, VHF and lower-UHF bands commonly used in military, public-safety, and amateur-radio SDR platforms. The 16-bit dynamic range allows simultaneous capture of multiple narrowband channels with software-selectable filtering. The QFN-48 package suits compact SDR form factors such as USB dongles and embedded modules where board space is constrained.
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: LTC2205CUK — 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 | LTC2205IUK | LTC2205CUK#PBF | LTC2206CUK | LTC2203IUK | LTC2208IUP |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 48-QFN (7x7) | 48-QFN (7x7) | 48-QFN (7x7) | 48-QFN (7x7) | 48-QFN (7x7) | 48-QFN (7x7) |
| Resolution | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit | 14/16 bit |
| Sample Rate | 65 Msps | 65 Msps | 65 Msps | 80 Msps | 10 Msps | 20 Msps |
| SNR | 79 dB | 79 dB | 79 dB | 77 dB | 74 dB | 76 dB |
| SFDR | 100 dB | 100 dB | 100 dB | 100 dB | 95 dB | 95 dB |
| Input Bandwidth | 700 MHz | 700 MHz | 700 MHz | 700 MHz | 700 MHz | 500 MHz |
| Operating Temperature | 0C to +70C (commercial) | -40C to +85C (industrial) | 0C to +70C (commercial, lead-free) | 0C to +70C (commercial) | -40C to +85C (industrial) | -40C to +85C (industrial) |
主な差別化要因
- Wider temperature range with same die （vs LTC2205IUK)
- Higher sample rate in same footprint （vs LTC2206CUK)
- RoHS-compliant orderable variant （vs LTC2205CUK#PBF)
設計ノート
The LTC2205 analog input traces should be routed as a 100-ohm differential pair from the driver amplifier to pins 1-2, kept short and isolated from digital output traces (pins 9-25) to avoid coupling digital switching noise into the analog front-end. Use a continuous ground plane on an inner PCB layer under the analog section, and keep the exposed pad (pin 49) soldered to a copper area of at least 1 square inch to provide both thermal dissipation and a low-impedance ground return. Per Analog Devices datasheet 22054fc, the analog and digital supply pins (VCC1/VCC2 and OVDD) should be decoupled with separate 10uF tantalum and 0.1uF ceramic capacitors placed within a few millimeters of the supply pins.
Drive the LTC2205 differential clock input (ENC+ / ENC-, pins 4-5) from a low-jitter clock source such as the AD9517 or ADCLK925, with a 50-ohm termination resistor network close to the ADC clock pins. The 90 fsRMS aperture jitter specification is only achievable if the source clock jitter is below 200 fsRMS; a noisy clock will directly reduce SNR. Route the clock traces on a controlled-impedance differential layer with isolation from noisy digital outputs. If the application allows CMOS clocking, AC-couple the clock input and terminate to 0.5V common-mode bias.
Estimated: the LTC2205 active power consumption is approximately 250 mW at 65 Msps from a 3.3V analog supply and 1.8V or 3.3V digital supply per Analog Devices datasheet 22054fc. For multi-ADC cards, four ADCs at 250 mW each totals 1W of converter dissipation; combine with adequate heatsinking or airflow. Use a low-dropout linear post-regulator after a switching DC-DC converter to remove switching noise from the analog supply; the LTC2205 PSRR is approximately 70 dB at 1 MHz but degrades at 10 MHz and above where switching-converter harmonics typically fall.
Do not operate the LTC2205 with the SHDN pin (pin 32) floating - tie it high (to OVDD) for normal operation. Do not exceed the absolute maximum analog input of 2.5V differential; exceeding this rating causes long-term reliability degradation. The MODE pin (pin 30) selects CMOS (default) or LVDS output - set before applying power or during reset. The PGA setting (SENSE pin 3) must be set per the datasheet voltage-divider formula for either 1.5 Vp-p or 2.25 Vp-p input range, otherwise the input common-mode voltage will be incorrect and SFDR will degrade.
コンプライアンス情報
Bare LTC2205CUK designation does not specify terminal finish; #PBF suffix variant is RoHS-compliant lead-free. AEC-Q100 not applicable for commercial-grade communications ADC. For automotive applications, consult Analog Devices automotive-grade portfolio.
