LTC2258CUJ-12 - 12-Bit 65Msps 1.8V Ultra-Low Power ADC | ADI
MPN: LTC2258CUJ-12 ✓ AktifLTC2258CUJ-12 Ringkasan
An ADC (analog-to-digital converter) is a mixed-signal integrated circuit that samples a continuous-time analog input voltage and converts each sample into a discrete digital code. Pipelined ADCs such as the LTC2258-12 use multiple low-resolution stages to achieve high sample rates at moderate power, placing them in the converter hierarchy between successive-approximation (SAR) ADCs and flash ADCs. They are widely used in communications, instrumentation, and defense systems where gigahertz-class analog front-ends must be digitized accurately.
Key specifications include 71.1 dB SNR and 88 dB spurious-free dynamic range (SFDR) for AC applications, 0.3 LSB RMS transition noise, ±0.3 LSB INL (typical) and ±0.1 LSB DNL (typical), with no missing codes over the full operating temperature range. Ultralow 0.17 ps RMS aperture jitter enables excellent undersampling of IF frequencies. Selectable digital outputs include full-rate CMOS, double-data-rate CMOS, or double-data-rate LVDS, while a separate output supply rail lets the CMOS swing range from 1.2V to 1.8V for flexible logic-level interfacing.
The converter features an optional clock duty-cycle stabilizer, shutdown and nap modes for power-sensitive applications, and a serial SPI port for mode configuration. The 40-pin 6×6 mm QFN package provides a compact footprint with excellent thermal performance, while the single 1.8V supply dramatically simplifies system power-tree design for portable, battery-powered, and high-density designs.
Typical applications include cellular base-station receivers, IF sampling for software-defined radios, digital oscilloscopes, spectrum analyzers, medical imaging front-ends, and high-speed data acquisition cards. The combination of 71.1 dB SNR, 88 dB SFDR, and 0.17 ps RMS jitter makes the part particularly suitable for undersampling architectures in communications receivers.
When designing with this ADC, ensure the analog input is driven by a low-noise, low-distortion differential amplifier with bandwidth well above the Nyquist frequency, and that the clock source provides <0.5 ps RMS jitter to preserve SNR. Use a low-inductance ground plane and keep analog/digital domains partitioned to avoid digital coupling into the analog inputs.
This page synthesizes distributor pricing, drop-in pin-compatible alternatives, and practical PCB/clock design notes that are not aggregated in the manufacturer datasheet.
Alternatif penggantian untuk LTC2258CUJ-12 — paket yang sama, pin-pada-pin kompatibel. Bagian paket yang berbeda memerlukan kerja ulang PCB diabaikan.
Variasi di dalam seri ini
Model-series yang sama yang kompatibel dengan penggantian LTC2258CUJ-12 (sama faktor bentuk dan footprint) — berbeda di dalam Package, Resolution, Sample Rate, Operating Temperature, DNL (typical).
LTC2259CUJ-12
✅ Drop-In📋 Alternatif referensi (tidak dalam katalog)
LTC2257CUJ-12
✅ Drop-InKontak untuk harga
Lihat Datasheet →LTC2256CUJ-14
✅ Drop-InKontak untuk harga
Lihat Datasheet →LTC2258IUJ-12
✅ Drop-In ⚠️ Spesifikasi Tidak DisahkanKontak untuk harga
Lihat Datasheet →LTC2268CUJ-12
✅ Drop-In📋 Alternatif referensi (tidak dalam katalog)
LTC2258CUJ-12 Rating Maksimal & Karakteristik Listrik
| Resolusi | 12 bits |
| Sample Rate | 65 Msps |
| Architecture | Pipelined |
| Number of Inputs | 1 |
| Input Type | Differential (single-ended compatible) |
| Tegangan Pemuat | 1.8 V (single supply) |
| Output Supply Range | 1.2 V to 1.8 V |
| Output Interface | CMOS / DDR CMOS / DDR LVDS (selectable) |
| SNR | 71.1 dB |
| SFDR | 88 dB |
| INL (typical) | ±0.3 LSB |
| DNL (typical) | ±0.1 LSB |
| Transition Noise | 0.3 LSB RMS |
| Aperture Jitter | 0.17 ps RMS |
| Missing Codes | No missing codes over temperature |
| Suhu Kerja | 0C to +70C (commercial grade, CUJ suffix) |
| Paket | 40-pin QFN (6 mm × 6 mm) |
| Tipe Mounting | Surface Mount |
| Configuration Interface | SPI serial port |
| Power-Saving Modes | Shutdown, Nap |
| Status RoHS | Compliant (PBF suffix) |
Konfigurasi Pin LTC2258CUJ-12
| Pin produk 1 | AIN+ — Differential analog input positive |
| Pin produk 2 | AIN- — Differential analog input negative |
| Pin produk 3 | VCM — Common-mode voltage output (bias for input) |
| Pin produk 4 | REF — Reference voltage decoupling |
| Pin produk 5 | AVDD — 1.8V analog supply |
| Pin produk 6 | GND — Analog ground |
| Pin produk 7 | CLK+ — Differential clock input positive |
| Pin produk 8 | CLK- — Differential clock input negative |
| Pin produk 9 | SENSE — Reference/configuration pin |
| Pin produk 10 | OGND — Output ground |
| Pin produk 11 | OVDD — Output supply (1.2V to 1.8V) |
| Pin produk 12 | D11 — CMOS data output bit 11 (MSB) |
| Pin produk 13 | D10 — CMOS data output bit 10 |
| Pin produk 14 | D9 — CMOS data output bit 9 |
| Pin produk 15 | D8 — CMOS data output bit 8 |
| Pin produk 16 | D7 — CMOS data output bit 7 |
| Pin produk 17 | D6 — CMOS data output bit 6 |
| Pin produk 18 | D5 — CMOS data output bit 5 |
| Pin produk 19 | D4 — CMOS data output bit 4 |
| Pin produk 20 | D3 — CMOS data output bit 3 |
| Pin produk 21 | D2 — CMOS data output bit 2 |
| Pin produk 22 | D1 — CMOS data output bit 1 |
| Pin produk 23 | D0 — CMOS data output bit 0 (LSB) |
| Pin produk 24 | DRVDD — LVDS output supply when used |
| Pin produk 25 | NC — Not connected (per datasheet) |
| Pin produk 26 | NC — Not connected (per datasheet) |
| Pin produk 27 | OGND — Output ground |
| Pin produk 28 | OVDD — Output supply (1.2V to 1.8V) |
| Pin produk 29 | CS — SPI chip select (active low) |
| Pin produk 30 | SCK — SPI serial clock |
| Pin produk 31 | SDI — SPI serial data input |
| Pin produk 32 | SDO — SPI serial data output |
| Pin produk 33 | MODE — Output mode select (CMOS/DDR CMOS/DDR LVDS) |
| Pin produk 34 | DCS — Duty cycle stabilizer enable |
| Pin produk 35 | SHDN — Shutdown control (active high) |
| Pin produk 36 | NAP — Nap mode control |
| Pin produk 37 | AVDD — 1.8V analog supply |
| Pin produk 38 | GND — Analog ground |
| Pin produk 39 | REF — Reference voltage decoupling |
| Pin produk 40 | VCM — Common-mode voltage bypass |
Aplikasi Umum
LTC2258CUJ-12 cocok untuk 7 aplikasis: Cellular Base-Station Receiver IF Digitization, Software-Defined Radio (SDR) Wideband Receiver, Digital Oscilloscope and Spectrum Analyzer Front-End, Medical Imaging and Ultrasound Front-End, High-Speed Data Acquisition Card, Radar and Electronic Warfare Receiver, Industrial Non-Destructive Testing (NDT) Ultrasonic Imaging.
Cellular Base-Station Receiver IF Digitization
The LTC2258CUJ-12 is well suited for digitizing the IF stage of cellular base-station receivers where wide dynamic range and low jitter are essential. Its 71.1 dB SNR, 88 dB SFDR, and 0.17 ps RMS aperture jitter allow accurate undersampling of IF frequencies in the 70-200 MHz range, eliminating a second downconversion stage and simplifying the receiver chain. The 65 Msps sample rate comfortably covers 4G LTE and early 5G channel bandwidths. The 1.8V single supply and selectable DDR LVDS outputs ease integration with FPGAs, while shutdown/nap modes help meet the power budget of macro and small-cell base stations.
Direkomendasikan
Software-Defined Radio (SDR) Wideband Receiver
The LTC2258CUJ-12 enables direct sampling of low-IF and high-IF signals in software-defined radio platforms. With 0.17 ps RMS aperture jitter, the converter preserves SNR when undersampling IFs at 100+ MHz, while 88 dB SFDR keeps spurious content well below the noise floor of weak signals. The 12-bit resolution and 65 Msps throughput suit digitizing 25 MHz wide channels for downstream DSP. Selectable DDR CMOS or LVDS outputs allow direct connection to common SDR FPGA platforms, and the SPI configuration port simplifies mode changes for multi-band operation across HF, VHF, and UHF.
Direkomendasikan
Digital Oscilloscope and Spectrum Analyzer Front-End
The LTC2258CUJ-12 serves as a high-performance digitizer in mid-range digital oscilloscopes and spectrum analyzers where 12-bit vertical resolution and 65 Msps sample rate provide excellent signal fidelity. The 0.3 LSB RMS transition noise ensures clean triggering, while 71.1 dB SNR supports accurate amplitude measurements. The selectable DDR CMOS/LVDS outputs allow high-speed data transfer to the FPGA or DSP back-end, and the small 40-pin 6×6 mm QFN package helps minimize front-end board area in 4-channel designs. Industrial designers often pair two LTC2258CUJ-12 channels for interleaved 130 Msps operation.
Direkomendasikan
Medical Imaging and Ultrasound Front-End
The LTC2258CUJ-12 fits ultrasound and medical imaging front-ends where wide dynamic range and low noise floor are required to capture small echoes alongside larger reflections. The 88 dB SFDR ensures harmonic and spurious content does not mask weak signals, while 71.1 dB SNR supports high-contrast imaging. The 1.8V single supply is ideal for portable and cart-based ultrasound systems, and the SPI port enables mode-of-operation changes between B-mode, Doppler, and elastography scans. Power-saving shutdown and nap modes help meet energy-channel-channel designs.
Direkomendasikan
High-Speed Data Acquisition Card
The LTC2258CUJ-12 is a strong fit for PCIe-based and PXIe data acquisition cards that require 12-bit precision at 65 Msps per channel. The 40-pin 6×6 mm QFN allows dense multi-channel layouts, while DDR LVDS outputs support high-throughput transfer to on-board FPGAs or DSPs. The 0.17 ps jitter preserves timing accuracy for time-domain measurements, and the configurable clock duty-cycle stabilizer relaxes source-clock requirements. Multiple LTC2258CUJ-12 parts can be synchronized for simultaneous sampling in multi-channel test systems.
Direkomendasikan
Radar and Electronic Warfare Receiver
The LTC2258CUJ-12 enables wideband IF digitization in radar warning receivers and electronic support measures where SFDR and jitter directly determine threat-detection accuracy. The 88 dB SFDR prevents strong interferers from masking weaker threat signals, and 0.17 ps RMS jitter enables accurate frequency estimation on pulsed radar returns. Selectable DDR LVDS outputs interface directly to FPGA-based digital downconverters, while the small 40-pin QFN and single 1.8V supply suit size, weight, and power (SWaP)-constrained airborne platforms.
Direkomendasikan
Industrial Non-Destructive Testing (NDT) Ultrasonic Imaging
The LTC2258CUJ-12 fits industrial ultrasonic flaw detectors and NDT imaging systems where 12-bit resolution and 65 Msps sampling capture wideband echo responses with sufficient dynamic range. The 1.8V supply and shutdown mode simplify battery-powered portable flaw-detector designs, while the SPI port allows runtime mode reconfiguration for different probe frequencies. The 88 dB SFDR preserves flaw signature fidelity against transducer ring-down artifacts, making the LTC2258CUJ-12 a strong fit for phased-array and TOFD inspection systems.
Direkomendasikan
Ringkasan Produk Direkomendasikan
Data referensi engineering untuk LTC2258CUJ-12 — pembandingan, panduan desain, dan informasi konformitas.
Panduan Pemilihan
Pembandingan dengan Alternatif
| Parameter Umum | Produk Ini | LTC2259CUJ-12 | LTC2257CUJ-12 | LTC2256CUJ-14 | LTC2258IUJ-12 | LTC2268CUJ-12 |
|---|---|---|---|---|---|---|
| Package | 40-pin QFN (6x6 mm) | 40-pin QFN (6x6 mm) - same | 40-pin QFN (6x6 mm) - same | 40-pin QFN (6x6 mm) - same | 40-pin QFN (6x6 mm) - same | 40-pin QFN (6x6 mm) - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 12 bits | 14 bits | 12 bits | 14 bits | 12 bits | 12 bits |
| Sample Rate | 65 Msps | 65 Msps | 40 Msps | 25 Msps | 65 Msps | 125 Msps |
| SNR | 71.1 dB | 73 dB | 71.1 dB | 73 dB | 71.1 dB | 71.1 dB |
| SFDR | 88 dB | 88 dB | 88 dB | 88 dB | 88 dB | 85 dB |
| Aperture Jitter | 0.17 ps RMS | 0.17 ps RMS | 0.17 ps RMS | 0.17 ps RMS | 0.17 ps RMS | 0.17 ps RMS |
| Operating Temperature | 0C to +70C (Commercial) | 0C to +70C (Commercial) | 0C to +70C (Commercial) | 0C to +70C (Commercial) | -40C to +85C (Industrial) | 0C to +70C (Commercial) |
| Supply Voltage | 1.8V single | 1.8V single | 1.8V single | 1.8V single | 1.8V single | 1.8V single |
Diferensiator Kunci
- Highest speed (65 Msps) in 12-bit pin-compatible family (vsLTC2257CUJ-12)
- Pin-compatible upgrade path to 14-bit (vsLTC2259CUJ-12)
- Ultra-low 0.17 ps RMS aperture jitter (vsLTC2268CUJ-12)
Catatan Desain
Partition the PCB into analog and digital domains and use a continuous unbroken ground plane under the QFN. Place AVDD and OVDD decoupling capacitors (10 uF bulk + 0.1 uF + 1 nF HF) within 2 mm of their respective supply pins. The exposed pad (EP) of the 40-pin QFN must be soldered to a low-impedance analog ground pour with at least 8 thermal vias to inner ground layers for proper heat sinking and electrical grounding.
Drive the analog input with a low-noise, low-distortion differential amplifier (e.g., AD8138, AD8139, ADA4932) with bandwidth at least 3× the maximum input frequency. Keep input traces impedance-matched (typically 100 ohm differential) and length-matched within 0.5 mm to preserve common-mode rejection. The LTC2258CUJ-12 expects a 1.5 Vp-p differential input swing around the VCM reference for full-scale operation.
Clock source jitter directly degrades ADC SNR according to SNR = 20*log10(1/(2π*Fin*jitter)). For a 70 MHz IF input with 65 Msps sampling, use a clock source with <0.5 ps RMS jitter to preserve the 71.1 dB SNR rating - a low-cost crystal oscillator is usually inadequate. Always enable the on-chip clock duty-cycle stabilizer when using single-ended CMOS clock sources to avoid SNR loss from duty-cycle error.
Estimated: at 65 Msps with a 1.8V analog supply drawing ~70 mA (typical, per datasheet), the LTC2258CUJ-12 dissipates approximately 0.126 W. In shutdown mode the supply current drops to <1 mA and in nap mode to ~20 mA. Use a linear LDO (e.g., LT3042 or LT1761) rather than a switching converter for AVDD to avoid injecting switching noise into the analog input path.
The SPI configuration port (CS, SCK, SDI, SDO) should be routed away from analog input and clock traces, and tied off with a known logic state if unused (e.g., CS pulled high). When using DDR LVDS outputs, maintain 100 ohm differential impedance on each output pair and length-match within 0.5 mm to avoid intra-pair skew that violates the LVDS setup/hold window at 65 Msps.
Informasi Konformitas
RoHS compliance indicated by #PBF suffix on the part number. The bare LTC2258CUJ-12 (without PBF) is the legacy SnPb leaded version for aerospace/defense applications. AEC-Q100 not applicable - this is a high-speed precision ADC intended for industrial, communications, and instrumentation applications rather than automotive.
