LTC2258IUJ-14 - 14-Bit 65Msps Ultralow Power 1.8V ADC | Analog Devices
MPN: LTC2258IUJ-14 ✓ نشطLTC2258IUJ-14 نظرة عامة
What is a pipelined ADC? A pipelined analog-to-digital converter is a high-speed Nyquist ADC architecture that uses cascaded low-resolution flash stages to digitize an analog input; each stage resolves a few bits then drives a residue amplifier for the next stage, enabling tens to hundreds of Msps throughput with 10-16 bit resolution and excellent power efficiency for communications, imaging, and instrumentation front-ends. This category sits hierarchically under analog-to-digital converter -> data converter -> mixed-signal IC -> semiconductor.
Key differentiating specifications include an integrated track-and-hold with 800 MHz full-power bandwidth, an input range selectable from 1 Vp-p to 2 Vp-p for direct coupling to IF/RF or baseband signal chains, 1.13 LSB RMS transition noise, and no-missing-codes behavior over the full industrial temperature range. DC linearity is robust at +/-1 LSB INL (typical) and +/-0.3 LSB DNL (typical).
The LTC2258IUJ-14's architecture combines a high-bandwidth front-end S/H with multi-stage pipeline conversion and a flexible digital output block; an optional on-chip clock duty-cycle stabilizer relaxes the jitter sensitivity of upstream clock sources, and an optional data-output randomizer reduces digital pattern-dependent interference on the PCB. The IUJ-14 grade is the industrial-temperature (-40 C to +85 C) variant in a 6 mm x 6 mm QFN-40 (UJ) package with an exposed pad.
Typical applications span portable and battery-powered digital oscilloscopes and handheld instrumentation, software-defined radio (SDR) and broadband communications IF digitization, industrial imaging and machine-vision front-ends, ultrasound receive channels, and high-speed data-acquisition cards. Pin compatibility with the 12-bit LTC2258IUJ-12, 40 Msps LTC2257IUJ-14, and 25 Msps LTC2256IUJ-14 in the same QFN-40 package allows designers to swap resolution/speed without re-laying out the board.
Design tip: keep analog and digital grounds separated by a split ground plane joined beneath the exposed pad, and place a 0.1 uF plus 10 uF decoupling pair as close as possible to both the 1.8 V AVDD pin and the separate OVDD pin to preserve SNR at high input frequencies.
This page synthesizes the datasheet, octopart pricing tiers, and same-footprint drop-in alternatives in the LTC2256/57/58 family - practical engineering context that is not found on a manufacturer product page alone.
بدائل مباشرة لـ LTC2258IUJ-14 — نفس الحزمة، متوافق دبوس بدبوس. تُستثنى القطع ذات الحزم المختلفة التي تتطلب تعديل PCB.
الطرازات في هذه السلسلة
طرازات من نفس السلسلة متوافقة تمامًا مع LTC2258IUJ-14 (نفس عامل الشكل والبصمة) — يختلف في Package, Resolution, Sample Rate, Transition Noise, Input Type.
LTC2258CUJ-12
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←LTC2257IUJ-14
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←LTC2256IUJ-14
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
LTC2258IUJ-14#TRPBF
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
LTC2260IUJ-14
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←LTC2258IUJ-14 الحدود القصوى والخصائص الكهربائية
| الدقة | 14 bits |
| معدل أخذ العينات | 65 Msps |
| Number of Input Channels | 1 |
| Architecture | Pipelined |
| Supply Voltage (AVDD) | 1.8 V (single) |
| Power Dissipation | 81 mW at 65 Msps |
| SNR | 74 dB |
| SFDR | 88 dB |
| INL (typical) | +/-1 LSB |
| DNL (typical) | +/-0.3 LSB |
| Transition Noise (RMS) | 1.13 LSB |
| Full-Power Input Bandwidth | 800 MHz |
| Selectable Input Range | 1 Vp-p to 2 Vp-p |
| Output Modes | CMOS / DDR CMOS / DDR LVDS |
| CMOS Output Swing (OVDD) | 1.2 V to 1.8 V |
| العلبة | 40-QFN (6 mm x 6 mm), exposed pad |
| نطاق درجة حرارة التشغيل | -40 C to +85 C (industrial, IUJ suffix) |
| Missing Codes | None over temperature |
تكوين أطراف LTC2258IUJ-14
| دبوس 1 | GND — Analog ground |
| دبوس 2 | AIN+ — Differential analog input, non-inverting |
| دبوس 3 | AIN- — Differential analog input, inverting |
| دبوس 4 | GND — Analog ground |
| دبوس 5 | REF — Internal reference decoupling node (connect 0.1 uF + 10 uF) |
| دبوس 6 | GND — Ground |
| دبوس 7 | AVDD — 1.8 V analog supply |
| دبوس 8 | GND — Analog ground |
| دبوس 9 | CLK — Sample clock input |
| دبوس 10 | CLKOUT- — Complementary clock output for SDR LVDS |
| دبوس 11 | CLKOUT+ — Clock output, used in DDR modes |
| دبوس 12 | GND — Ground |
| دبوس 13 | OVDD — Output supply, 1.2 V to 1.8 V |
| دبوس 14 | OGND — Output ground |
| دبوس 15 | D0 — Data bit 0 (LSB) |
| دبوس 16 | D1 — Data bit 1 |
| دبوس 17 | D2 — Data bit 2 |
| دبوس 18 | D3 — Data bit 3 |
| دبوس 19 | D4 — Data bit 4 |
| دبوس 20 | D5 — Data bit 5 |
| دبوس 21 | D6 — Data bit 6 |
| دبوس 22 | D7 — Data bit 7 |
| دبوس 23 | D8 — Data bit 8 |
| دبوس 24 | D9 — Data bit 9 |
| دبوس 25 | D10 — Data bit 10 |
| دبوس 26 | D11 — Data bit 11 |
| دبوس 27 | D12 — Data bit 12 |
| دبوس 28 | D13 — Data bit 13 (MSB) |
| دبوس 29 | NC — Not connected (per datasheet) |
| دبوس 30 | OF — Output data format / over-range |
| دبوس 31 | OGND — Output ground |
| دبوس 32 | MODE — Output mode select (CMOS / DDR CMOS / DDR LVDS) |
| دبوس 33 | CS — Serial port chip select |
| دبوس 34 | SDI — Serial port data input |
| دبوس 35 | SCK — Serial port clock |
| دبوس 36 | SDO — Serial port data output |
| دبوس 37 | EN — Chip enable (active high) |
| دبوس 38 | SENSE — Input range select / reference mode |
| دبوس 39 | OGND — Output ground |
| دبوس 40 | AVDD — 1.8 V analog supply |
| دبوس EP | EP — Exposed thermal pad - must be soldered to analog ground plane for thermal dissipation |
التطبيقات النموذجية
LTC2258IUJ-14 مناسب لـ 6 التطبيقs: Portable Digital Oscilloscope Front-End, Software-Defined Radio (SDR) IF Sampling, Industrial Imaging and Machine Vision, Medical Ultrasound Receive Channel, Communications Test and Measurement Instrumentation, Data Acquisition Card for Embedded Systems.
Portable Digital Oscilloscope Front-End
The LTC2258IUJ-14 is well suited to portable and handheld digital oscilloscope front-ends where 14-bit vertical resolution and 65 Msps acquisition are needed at low power. Its 81 mW dissipation extends battery runtime in field instruments. With 74 dB SNR and 88 dB SFDR the converter preserves waveform fidelity on small-signal measurements, and the LVDS/DDR-CMOS output modes simplify routing of high-speed sample data to a downstream FPGA. Designers should allocate ample copper pour under the QFN-40 exposed pad to keep junction temperature below +85 C in enclosed plastic enclosures.
موصى به
Software-Defined Radio (SDR) IF Sampling
In SDR receivers the LTC2258IUJ-14 samples 1 Vp-p to 2 Vp-p IF signals at 65 Msps, providing 74 dB SNR and 88 dB SFDR at the Nyquist limit. The 800 MHz full-power bandwidth captures second- and third-Nyquist zones, supporting direct IF sampling architectures that eliminate one or two analog mixer stages. The selectable CMOS / DDR-CMOS / DDR-LVDS outputs interface directly to modern FPGAs used as digital downconverters. Selectable full-rate or double-data-rate LVDS keeps trace counts manageable on dense RF baseband boards.
موصى به
Industrial Imaging and Machine Vision
The 65 Msps 14-bit throughput of the LTC2258IUJ-14 supports high-speed line-scan and area-scan cameras in industrial inspection systems. Its +/-1 LSB INL and +/-0.3 LSB DNL typical DC linearity ensure calibrated grayscale reproduction across the full 14-bit code range, and the no-missing-codes guarantee over -40 C to +85 C prevents dropped pixels in temperature-cycled production environments. The DDR-LVDS output mode aggregates 14-bit parallel data across fewer PCB traces, simplifying routing to a camera-link serializer or FPGA-based frame grabber.
موصى به
Medical Ultrasound Receive Channel
In portable ultrasound receivers the LTC2258IUJ-14 digitizes 1 Vp-p to 2 Vp-p RF echoes at 65 Msps, combining 74 dB SNR with low 81 mW dissipation per channel. The differential analog inputs reject common-mode pickup from nearby transmit HV circuits; the exposed-pad QFN-40 provides a low thermal-resistance path. Designers typically deploy four to sixteen LTC2258IUJ-14 channels in parallel, fanning LVDS outputs to a beamformer FPGA. Industrial-temperature rating (-40 C to +85 C) supports clinical-cart and field-deployable medical devices.
موصى به
Communications Test and Measurement Instrumentation
Vector signal analyzers, arbitrary waveform generators, and communications testers use the LTC2258IUJ-14 to digitize modulated IF signals with high fidelity. 74 dB SNR gives in-channel EVM suitable for 3G/4G signal analysis, and the optional on-chip clock duty-cycle stabilizer reduces sensitivity to FPGA-generated clock jitter, simplifying board-level clock distribution. Pin-compatibility with 40 and 25 Msps variants lets test-equipment designers reuse the same PCB across product tiers (entry / mid / high).
موصى به
Data Acquisition Card for Embedded Systems
PCIe and PXI Express data-acquisition cards use the LTC2258IUJ-14 to convert transducer outputs into host-processor-readable samples at up to 65 Msps with 14-bit precision. The DDR-LVDS output mode minimizes FPGA pin count and PCB trace density, while the 1.8 V single supply simplifies power-tree design on dense acquisition boards. With 800 MHz input bandwidth the card can digitize vibration, sonar, and radar pulses directly without front-end downconversion. Shutdown and Nap modes reduce power when high-impedance channels are not being sampled.
موصى به
ملخص المنتجات الموصى بها
بيانات مرجعية هندسية لـ LTC2258IUJ-14 — المقارنة وإرشادات التصميم ومعلومات الامتثال.
دليل الاختيار
المقارنة مع البدائل
| المعامل | هذا المنتج | LTC2258CUJ-12 | LTC2257IUJ-14 | LTC2256IUJ-14 | LTC2258IUJ-14#TRPBF | LTC2260IUJ-14 |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 40-QFN (UJ, 6x6 mm) | 40-QFN (UJ, 6x6 mm) - same | 40-QFN (UJ, 6x6 mm) - same | 40-QFN (UJ, 6x6 mm) - same | 40-QFN (UJ, 6x6 mm) - same | 40-QFN (UJ, 6x6 mm) - same |
| Resolution | 14 bits | 12 bits | 14 bits | 14 bits | 14 bits | 14 bits |
| Sampling Rate | 65 Msps | 65 Msps | 40 Msps | 25 Msps | 65 Msps | 65 Msps |
| Power Dissipation | 81 mW | 81 mW | 49 mW | 35 mW | 81 mW | Similar |
| SNR | 74 dB | 72-73 dB (12-bit) | 74 dB | 74 dB | 74 dB | 74 dB |
| Operating Temperature | -40 C to +85 C (industrial) | 0 C to +70 C (commercial) | -40 C to +85 C (industrial) | -40 C to +85 C (industrial) | -40 C to +85 C (industrial) | -40 C to +85 C (industrial) |
| Full-Power Input Bandwidth | 800 MHz | 800 MHz | 800 MHz | 800 MHz | 800 MHz | 800 MHz |
أبرز الفروقات
- Ultralow 81 mW power at full 65 Msps sampling rate (مقابلLTC2257IUJ-14)
- Industrial temperature grade with 14-bit resolution (مقابلLTC2258CUJ-12)
- Wide input range 1 Vp-p to 2 Vp-p selectable on-chip (مقابلLTC2256IUJ-14)
ملاحظات التصميم
Use a split ground plane separating analog GND (pins 1, 4, 6, 8, 12) and digital OGND (pins 14, 31, 39); join the two domains under the QFN-40 exposed pad (pin 41/EP). Decouple AVDD (pins 7 and 40) with 0.1 uF X7R plus 10 uF X5R ceramics placed within 3 mm of each pin; decouple OVDD (pin 13) independently because the output supply is split for noise isolation. Symmetric, length-matched routing of AIN+ and AIN- from the driving op-amp to the ADC pins preserves the differential 800 MHz bandwidth.
Drive the analog inputs AIN+ / AIN- with a low-noise, low-distortion fully-differential op-amp (e.g., an LT6402-class driver) and provide common-mode bias through the SENSE pin. Match input trace lengths within 0.5 mm and use a 100 ohm differential transmission-line characteristic impedance; this preserves the 88 dB SFDR at near-Nyquist input frequencies. Optional on-chip clock duty-cycle stabilizer mitigates performance loss from imperfect CLK duty cycle when the clock is FPGA-derived.
Estimated: at 81 mW dissipation and the QFN-40 package theta_JA of approximately 38 C/W on a 4-layer JEDEC test board, junction-to-ambient rise is about 3.1 C - well below the +85 C industrial limit at +25 C ambient. In enclosed plastic enclosures with poor airflow, thermal rise can increase by a factor of 2-3; in those cases add ground-plane thermal vias beneath the EP and/or reduce OVDD voltage to 1.2 V to lower dissipation on the output drivers. Always solder the exposed pad completely for lowest theta_JC.
Estimated: do not exceed absolute maximum input range of V_AVDD + 0.3 V on AIN+ / AIN- or permanent damage will occur - place external protection diodes if upstream transients are possible. Connect the REF pin to a 0.1 uF X7R plus 10 uF ceramic capacitor pair within 1 mm; omitted or undersized decoupling reduces SNR by 3-5 dB. For LVDS applications ensure the 100 ohm near-end termination resistor at each LVDS pair; mismatched termination degrades SFDR. Finally, hold MODE pin logic-low until AVDD stabilizes to prevent digital contention during power-up.
معلومات الامتثال
Lead-free RoHS-compliant per the #PBF suffix designation. Not AEC-Q100 qualified (consumer/industrial part, not automotive). Halogen-free status not explicitly stated in retrieved data.
