LTC2170IUKG-14 - 14-Bit 25Msps Quad ADC | Analog Devices
MPN： LTC2170IUKG-14 ✓ 啟用中LTC2170IUKG-14 概覽
A pipelined ADC is a high-speed successive-approximation architecture that breaks the conversion into multiple low-resolution stages, each driving the next through a residue amplifier. This architecture enables simultaneous multi-channel sampling at tens of megasamples per second while keeping per-channel power modest, which is why quad pipelined ADCs dominate communications, radar, and medical imaging front-ends where dense channel counts matter. The LTC2170 sits within the broader product taxonomy as: pipelined ADC -> successive-approximation/flash-pipelined ADC -> analog-to-digital converter -> data converter -> mixed-signal IC -> semiconductor.
Key features include per-channel sample rates up to 25 Msps, 14-bit resolution, four independent differential or single-ended analog inputs, integrated input buffer option, programmable full-scale range via internal reference, pin-selectable CMOS or LVDS output modes, and a per-channel SNR figure consistent with the family datasheet. The exposed pad on the QFN package transfers die heat directly into the PCB copper pour, reducing junction temperature and enabling sustained full-rate operation across all four channels.
Typical applications include diversity radio receivers, multi-antenna MIMO baseband digitizers, portable or battery-powered test and measurement instruments, ultrasound imaging front-ends, and any system that requires dense multi-channel simultaneous sampling without the cost of four discrete ADCs. The serial LVDS mode minimizes board routing for high-density systems, while parallel CMOS remains useful for legacy FPGA or ASIC capture.
When laying out the PCB, ensure the exposed pad is soldered to a continuous ground plane with multiple thermal vias to dissipate roughly 1 W of total device dissipation. Decouple OVD and AVD rails independently with 0.1 uF and 10 uF ceramic capacitors placed as close as possible to the supply pins, and keep analog inputs routed over a contiguous ground reference.
直接替換替代品，適用於 LTC2170IUKG-14 — 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： LTC2170IUKG-14 （相同外形與佔位） — 差異在於 Package, Architecture, Number of Channels, Resolution, RoHS Status.
LTC2171IUKG-14
✅ 直接替換📋 參考替代品（不在目錄中）
LTC2172IUKG-14
✅ 直接替換📋 參考替代品（不在目錄中）
LTC2170IUKG-12
✅ 直接替換聯絡詢價
查看資料表 →LTC2170IUKG-14#PBF
✅ 直接替換📋 參考替代品（不在目錄中）
LTC2174IUKG-14
✅ 直接替換聯絡詢價
查看資料表 →LTC2170IUKG-14 最大額定值與電氣特性
| 解析度 | 14 bit |
| Number of Channels | 4 |
| Sample Rate | 25 Msps |
| Architecture | Pipelined |
| Input Type | Differential / Single-Ended |
| Analog Supply Voltage | 1.7 V to 1.9 V |
| Digital Supply Voltage | 1.7 V to 1.9 V |
| Output Interface | Parallel CMOS / Serial LVDS (selectable) |
| 封裝 | 52-QFN (7x8 mm) with exposed pad |
| 安裝類型 | Surface Mount |
| 工作溫度 | -40 C to +85 C |
| RoHS 狀態 | Compliant |
| Lead-Free | Yes |
| Sample-and-Hold | Integrated per channel |
LTC2170IUKG-14 52-qfn (7x8 mm) with exposed pad 腳位配置指南
LTC2170IUKG-14（52-qfn (7x8 mm) with exposed pad 封裝）的腳位配置。 此類比元件具有輸入、輸出與電源腳位。偏移歸零、補償與致能腳位配置請參閱製造商資料表。適用於訊號調理與放大器電路。
無詳細腳位定義資料： LTC2170IUKG-14.
請參閱 資料表 以查看完整腳位配置。
典型應用
LTC2170IUKG-14 適用於 6 應用s: Diversity Radio Receiver, Phased-Array Radar / Beamforming Front-End, Ultrasound Imaging Front-End, Portable Test & Measurement Instrumentation, Industrial Vibration & Acoustic Monitoring, Software Defined Radio (SDR) Baseband Digitizer.
Diversity Radio Receiver
The LTC2170IUKG-14 fits diversity radio receivers because it provides four simultaneously-sampling 14-bit channels at 25 Msps in a single 52-QFN, eliminating skew between antenna paths. Each channel delivers ~73 dB SNR, suitable for demodulating weak signals in cellular base-station and software-defined-radio front-ends. Pair it with an FPGA that ingests parallel CMOS outputs directly, or use serialized LVDS to minimize board routing on dense 4x4 MIMO boards. The 1.7-1.9 V analog/digital supply simplifies interface to low-voltage FPGAs, while the exposed thermal pad keeps the junction within spec at full 25 Msps across four channels.
推薦
Phased-Array Radar / Beamforming Front-End
The LTC2170IUKG-14 suits phased-array and beamforming front-ends where multiple antenna channels must be digitized simultaneously with matched time-domain characteristics. Four matched 14-bit channels at 25 Msps with sub-sample inter-channel skew give designers deterministic phase accuracy in digital beamforming DSP. The 52-QFN footprint is roughly 75% smaller than four discrete ADCs, allowing denser element spacing on PCB arrays. Differential inputs reject common-mode noise from RF downconversion stages, and the integrated sample-and-hold eliminates the need for RF-tuned driver amplifiers at IF bandwidths under 50 MHz.
推薦
Ultrasound Imaging Front-End
The LTC2170IUKG-14 supports portable and mid-channel-count ultrasound imaging front-ends by digitizing four transducer channels simultaneously at 14 bits and 25 Msps. The low per-channel power keeps total dissipation manageable for handheld probes, while the 14-bit dynamic range captures the wide dynamic range of returning echoes without saturating on near-field reflections. Selectable CMOS or LVDS outputs let designers route data to mid-range FPGAs over either parallel or serialized lanes, depending on channel count. The exposed pad plus ground-plane thermal vias sustain continuous full-rate sampling on all four channels without thermal throttling.
推薦
Portable Test & Measurement Instrumentation
The LTC2170IUKG-14 is a strong fit for portable oscilloscopes, spectrum analyzers, and data-acquisition modules that need four matched high-speed channels at low power. The 14-bit resolution at 25 Msps delivers enough dynamic range to capture transient and modulated signals, while the 1.7-1.9 V supply allows direct battery operation from a single Li-ion cell via a buck regulator. Designers can place the ADC near the analog front-end, route serialized LVDS to a host FPGA or DSP, and rely on the exposed pad to dissipate roughly 1 W into the chassis copper. Differential inputs reject common-mode noise from switching supplies in the same enclosure.
推薦
Industrial Vibration & Acoustic Monitoring
The LTC2170IUKG-14 fits industrial condition-monitoring systems that sample multiple accelerometers or acoustic emission sensors at the same instant. Simultaneous sampling on four channels preserves relative phase information for FFT-based modal analysis, while 14-bit resolution at 25 Msps captures the harmonic content needed for bearing-fault and gear-mesh diagnostics. The -40 C to +85 C industrial temperature range supports factory-floor deployments, and the small 52-QFN footprint enables multi-channel sensor pods with tight spacing. Selectable LVDS output keeps cabling short in distributed sensor networks.
推薦
Software Defined Radio (SDR) Baseband Digitizer
The LTC2170IUKG-14 works as a baseband digitizer in narrow-band SDR platforms, where four matched channels at 14 bits and 25 Msps capture I/Q pairs from multiple receivers. The differential input architecture rejects common-mode noise from RF mixers, and the pin-selectable LVDS output lets designers connect the ADC directly to FPGA transceivers without an intermediate logic-conversion stage. Per-channel SNR around 73 dB provides sufficient dynamic range for narrow-band demodulation of DVB, LTE, and proprietary waveforms. The exposed-pad QFN keeps the device thermally stable under sustained streaming workloads.
推薦
推薦產品摘要
工程參考資料，適用於 LTC2170IUKG-14 — 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 | LTC2171IUKG-14 | LTC2172IUKG-14 | LTC2170IUKG-12 | LTC2174IUKG-14 |
|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 52-QFN (7x8 mm) | 52-QFN (7x8 mm) - same | 52-QFN (7x8 mm) - same | 52-QFN (7x8 mm) - same | 52-QFN (7x8 mm) - same |
| Resolution | 14 bit | 14 bit | 14 bit | 12 bit | 14 bit |
| Sample Rate | 25 Msps | 40 Msps | 65 Msps | 25 Msps | 105 Msps |
| Number of Channels | 4 | 4 | 4 | 4 | 1 |
| Analog Supply Voltage | 1.7 V to 1.9 V | 1.7 V to 1.9 V | 1.7 V to 1.9 V | 1.7 V to 1.9 V | 1.7 V to 1.9 V |
| Output Interface | CMOS / LVDS | CMOS / LVDS | CMOS / LVDS | CMOS / LVDS | CMOS / LVDS |
| Operating Temperature | -40 C to +85 C (industrial) | -40 C to +85 C | -40 C to +85 C | 0 C to +70 C (commercial) | -40 C to +85 C |
主要差異化特點
- Lowest sample rate in 14-bit quad LTC217x family (對比LTC2171IUKG-14)
- Higher resolution than LTC2170IUKG-12 (對比LTC2170IUKG-12)
- Four matched channels vs single channel (對比LTC2174IUKG-14)
- Industrial temperature grade for factory-floor use (對比LTC2170CUKG-12)
設計說明
Estimated: At 25 Msps across all four channels, total device dissipation is approximately 1 W. The 52-QFN package relies on the bottom-side exposed pad as the primary heat-removal path. Solder the pad to a continuous ground plane with at least 9 thermal vias (0.3 mm drill, 0.6 mm pitch) under the pad to achieve the datasheet theta_JA of roughly 30 C/W, keeping junction temperature within the 125 C limit at 85 C ambient.
Decouple AVD and OVD rails independently with a 0.1 uF X7R ceramic placed within 2 mm of each supply pin and a 10 uF bulk ceramic on each rail. Place a ferrite bead or small resistor between AVD and OVD to break ground-loop coupling, and route analog inputs over a contiguous ground reference. Keep digital output traces short; for LVDS mode, maintain 100 ohm differential impedance and length-match the pairs within 5 mm to preserve timing margins.
Route the analog inputs as tightly-coupled differential pairs with characteristic impedance of 50 ohm (single-ended) or 100 ohm (differential), keeping traces symmetrical and short. Avoid routing digital outputs across the analog input region to prevent digital noise coupling. Place the encode clock trace away from analog inputs and provide a clean low-jitter clock source; the LTC2170-14 datasheet specifies that clock jitter directly degrades SNR at high input frequencies.
Estimated: At an analog input frequency near 50 MHz, every 1 ps of clock jitter degrades SNR by roughly 1 dB. The LTC2170-14 datasheet SNR is approximately 73 dB at low input frequencies; to preserve this in real designs, use a low-jitter clock driver (e.g., AD9510 or equivalent) and minimize the clock trace length. For LVDS output mode, terminate each differential pair with 100 ohm at the receiver to prevent reflections.
Do not exceed 1.9 V on the analog or digital supply rails. Failing to solder the exposed pad is the most common reliability failure on QFN ADC packages and typically causes thermal shutdown or output code errors under load. Verify that the input common-mode voltage stays within the datasheet range; out-of-range common-mode causes gain and offset drift. Finally, do not leave unused analog inputs floating - tie them to midscale to avoid pickup that can leak into adjacent channels.
合規資訊
RoHS and lead-free compliant per Analog Devices product page. Industrial temperature grade -40 C to +85 C. AEC-Q100 is not applicable (consumer/industrial part, not automotive qualified).
