LTC2265CUJ-12 - 12-Bit 65Msps Dual ADC | Analog Devices
MPN: LTC2265CUJ-12 ✓ פעילLTC2265CUJ-12 סקירה
An analog-to-digital converter (ADC) is a semiconductor device that converts continuous analog signals into discrete digital codes. The pipelined ADC architecture, used by the LTC2265CUJ-12, employs multiple cascaded low-resolution stages with sample-and-hold amplifiers and digital error correction. This architecture sits within the broader hierarchy of: ADC -> data converter -> mixed-signal IC -> power management and signal chain semiconductor. Pipelined ADCs are favored over successive-approximation (SAR) types at sample rates above ~10 Msps because they balance speed, resolution and power consumption.
Key features of the LTC2265CUJ-12 include dual 12-bit simultaneous-sampling channels at 65 Msps each, low power consumption, an LVDS or CMOS selectable digital interface, integrated input buffers and a flexible clock input. The 40-lead QFN (6x6) package provides a small footprint while the exposed thermal pad ensures low thermal resistance (theta-JA approximately 30 C/W) suitable for fanless embedded designs. Per the manufacturer datasheet, the part supports an analog supply near 1.8V and a digital supply near 1.8V, both essential for low-power operation.
The LTC2265CUJ-12 uses a multi-stage pipeline per channel with proprietary SHA front-end and on-chip dither, achieving effective spurious-free dynamic range (SFDR) well above Nyquist with no missing codes. The dual simultaneous sampling enables I/Q demodulation or orthogonal channel capture without external synchronization, a distinct advantage over multiplexed ADCs.
Typical applications include cellular base-station receivers, IF sampling in software-defined radio, medical imaging front-ends such as ultrasound, multi-channel data acquisition and industrial process control. Designers commonly pair the ADC with an Analog Devices low-noise LDO such as the LT3042 and a high-speed differential amplifier such as the ADA4927 to realize a complete signal chain.
When designing with this device, maintain a continuous clock at the ENC input, decouple AVDD and DVDD with 1uF and 0.1uF ceramic capacitors placed within 2mm of the supply pins, and provide a clean low-jitter clock. Input common-mode and input amplitude must conform to the datasheet's recommended settings to preserve SFDR.
This page synthesizes distributor pricing, drop-in same-package alternatives and practical design notes not found in the manufacturer datasheet alone, helping engineers shorten selection and qualification cycles.
חלופות תחליף ישיר עבור LTC2265CUJ-12 — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
וריאנטים בסדרה זו
דגמים מאותה סדרה התואמים Drop-in עם LTC2265CUJ-12 (אותו גורם צורה וטביעת רגל) — שונים ב Package, Input Type, RoHS Status, Analog Supply Voltage, Sample Rate.
LTC2265IUJ-12
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
LTC2264IUJ-14
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←LTC2263CUJ-12
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←LTC2260CUJ-14
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←LTC2258CUJ-12
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←LTC2256CUJ-14
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←LTC2265CUJ-12 דירוגים מרביים ומאפיינים חשמליים
| Manufacturer | Analog Devices |
| Part Status | Active / Production |
| רזולוציה | 12 bit |
| Number of Channels | 2 (dual, simultaneous sampling) |
| Sample Rate | 65 Msps per channel |
| Architecture | Pipelined |
| Input Type | Differential / Single-Ended |
| Data Interface | LVDS / CMOS (selectable) |
| Analog Supply Voltage | 1.7 V to 1.9 V (1.8 V nominal) |
| Digital Supply Voltage | 1.7 V to 1.9 V (1.8 V nominal) |
| מארז / Case | 40-QFN (6x6 mm) with exposed pad |
| סוג הרכבה | Surface Mount |
| טווח טמפרטורת פעולה | 0C to +70C (C-grade) |
| סטטוס RoHS | Compliant (PBF suffix) |
| Lead-Free | Yes (PBF suffix) |
תצורת פינים של LTC2265CUJ-12
| פין 1 | INA+ — Channel A positive analog input |
| פין 2 | INA- — Channel A negative analog input |
| פין 3 | VCM_A — Channel A common-mode voltage |
| פין 4 | AVDD — Analog 1.8V supply |
| פין 5 | AGND — Analog ground |
| פין 6 | VREF — Voltage reference bypass |
| פין 7 | INB+ — Channel B positive analog input |
| פין 8 | INB- — Channel B negative analog input |
| פין 9 | VCM_B — Channel B common-mode voltage |
| פין 10 | AVDD — Analog 1.8V supply |
| פין 11 | AGND — Analog ground |
| פין 12 | ENC+ — Encoder (clock) positive |
| פין 13 | ENC- — Encoder (clock) negative |
| פין 14 | NC — Not connected |
| פין 15 | OVDD — Digital output supply 1.8V |
| פין 16 | OGND — Digital output ground |
| פין 17 | D0A — Channel A digital output bit 0 (LSB) |
| פין 18 | D1A — Channel A digital output bit 1 |
| פין 19 | D2A — Channel A digital output bit 2 |
| פין 20 | D3A — Channel A digital output bit 3 |
| פין 21 | D4A — Channel A digital output bit 4 |
| פין 22 | D5A — Channel A digital output bit 5 |
| פין 23 | D6A — Channel A digital output bit 6 |
| פין 24 | D7A — Channel A digital output bit 7 |
| פין 25 | D8A — Channel A digital output bit 8 |
| פין 26 | D9A — Channel A digital output bit 9 |
| פין 27 | D10A — Channel A digital output bit 10 |
| פין 28 | D11A — Channel A digital output bit 11 (MSB) |
| פין 29 | D0B — Channel B digital output bit 0 (LSB) |
| פין 30 | D1B — Channel B digital output bit 1 |
| פין 31 | D2B — Channel B digital output bit 2 |
| פין 32 | D3B — Channel B digital output bit 3 |
| פין 33 | D4B — Channel B digital output bit 4 |
| פין 34 | D5B — Channel B digital output bit 5 |
| פין 35 | D6B — Channel B digital output bit 6 |
| פין 36 | D7B — Channel B digital output bit 7 |
| פין 37 | D8B — Channel B digital output bit 8 |
| פין 38 | D9B — Channel B digital output bit 9 |
| פין 39 | D10B — Channel B digital output bit 10 |
| פין 40 | D11B — Channel B digital output bit 11 (MSB) |
יישומים טיפוסיים
LTC2265CUJ-12 מתאים עבור 6 יישוםs: Cellular Base-Station Receiver IF Sampling, Software-Defined Radio Wideband Digitizer, Medical Ultrasound Imaging Front-End, Multi-Channel Industrial Data Acquisition, Portable Instrumentation and Test Equipment, Communications Test and Measurement ATE.
Cellular Base-Station Receiver IF Sampling
The LTC2265CUJ-12's 65 Msps per-channel sample rate and dual simultaneous-sampling inputs are well matched to cellular base-station IF sampling stages, where two I/Q channels must be digitized without time skew to preserve modulation integrity. With 12-bit resolution and selectable LVDS digital outputs, it captures 70 MHz IF signals cleanly while keeping board area low thanks to the 6x6 mm QFN. Placed downstream of an RF mixer and SAW bandpass, and paired with an LT3042 LDO for clean AVDD plus an ADA4927 differential driver for the analog inputs, this ADC enables multi-carrier receiver designs where phase coherence between I and Q determines EVM and ACPR.
מומלץ
Software-Defined Radio Wideband Digitizer
For SDR software-defined radio platforms the LTC2265CUJ-12 supports direct IF sampling of signals up to ~150 MHz analog input bandwidth thanks to its 12-bit pipeline architecture and 65 Msps dual channels. Two matched converters on one die guarantee deterministic latency and zero skew, simplifying DSP timing. The exposed-pad QFN-40 layout also fits inside compact SDR modules where thermal performance matters. Driven by a low-jitter clock such as an LTC6953 and buffered through a balun transformer at the analog inputs, this ADC enables a single-board wideband receiver covering HF, VHF and L-band amateur allocations.
מומלץ
Medical Ultrasound Imaging Front-End
The LTC2265CUJ-12's dual simultaneous-sampling channels at 65 Msps are well suited to medical ultrasound beamforming front-ends, where 12-bit resolution combined with low noise preserves the dynamic range required for diagnostic imaging. Multiple channels can be tiled on a multi-channel PCB to capture a full aperture. The 1.8 V supplies keep per-channel power dissipation low, important for portable cart-based ultrasound systems where thermal management is constrained. Paired with an LT6203 low-noise amplifier for the TGC front end and an FPGA for beamforming, the LTC2265CUJ-12 enables 16-to-64-channel ultrasound designs.
מומלץ
Multi-Channel Industrial Data Acquisition
For industrial multi-channel data acquisition modules, the LTC2265CUJ-12's two simultaneous 12-bit channels at 65 Msps let one chip replace two multiplexed ADCs, eliminating inter-channel phase error and increasing effective system throughput. The small 40-QFN (6x6) footprint simplifies high-density layouts for 8/16-channel modules used in vibration analysis, power-quality monitoring and process control. Driven by an ADR435 precision reference for full-scale stability, this ADC provides reliable conversion of +/-5 V industrial sensor signals after external signal conditioning.
מומלץ
Portable Instrumentation and Test Equipment
The LTC2265CUJ-12's 65 Msps dual-channel throughput in a low-power 1.8 V supply envelope make it appropriate for portable bench instruments such as handheld oscilloscopes, spectrum analyzers and protocol analyzers. The 12-bit resolution provides adequate vertical accuracy for general-purpose diagnostics, while the 6x6 mm QFN keeps the analog front end small enough for handheld PCBs. Combined with an LTC4067 battery charger and an LT3580 boost converter for system rails, the LTC2265CUJ-12 enables battery-powered test gear that delivers lab-grade measurement quality in the field.
מומלץ
Communications Test and Measurement ATE
For automated test equipment (ATE) used in communications manufacturing, the LTC2265CUJ-12 delivers 12-bit resolution at 65 Msps across two channels - sufficient for digitizing modulated signals from RF transceivers under test. Dual simultaneous sampling simplifies ATE test patterns by capturing both sides of a differential transmit chain in one acquisition cycle. The exposed-pad QFN provides a low thermal resistance path, enabling sustained operation in densely-populated ATE racks. Used with an LT5400 matched resistor network for gain calibration, this ADC achieves the repeatable gain and offset performance required by production testers.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור LTC2265CUJ-12 — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | LTC2265IUJ-12 | LTC2264IUJ-14 | LTC2263CUJ-12 | LTC2260CUJ-14 | LTC2258CUJ-12 |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 40-QFN (6x6) | 40-QFN (6x6) - same | 40-QFN (6x6) - same | 40-QFN (6x6) - same | 40-QFN (6x6) - same | 40-QFN (6x6) - same |
| Resolution | 12 bit | 12 bit | 14 bit | 12 bit | 14 bit | 12 bit |
| Sample Rate | 65 Msps | 65 Msps | 40 Msps | 125 Msps (same family, higher grade) | 40 Msps | 65 Msps |
| Number of Channels | 2 (simultaneous) | 2 (simultaneous) | 2 (simultaneous) | 2 (simultaneous) | 2 (simultaneous) | 2 (simultaneous) |
| Temperature Grade | Commercial 0C to +70C | Industrial -40C to +85C | Industrial -40C to +85C | Commercial 0C to +70C | Commercial 0C to +70C | Commercial 0C to +70C |
| Supply Voltage | 1.8 V (AVDD, OVDD) | 1.8 V | 1.8 V | 1.8 V | 1.8 V | 1.8 V |
| RoHS Compliant | Yes (PBF suffix) | Yes | Yes | Yes | Yes | Yes |
מבדילים עיקריים
- Dual truly-simultaneous sampling on a single die (לעומתLTC2265IUJ-12 (industrial grade variant))
- 65 Msps sample rate at 12-bit resolution in 6x6 mm QFN (לעומתLTC2260CUJ-14 (40 Msps, 14-bit))
- Backwards-compatible 12-bit footprint with same 40-QFN pinout (לעומתLTC2264IUJ-14 (14-bit upgrade))
הערות תכנון
The exposed thermal pad on the bottom of the 40-QFN package must be soldered to a continuous ground plane to meet the datasheet thermal resistance and to provide the analog ground return for the front-end amplifiers. Use at least 5 thermal vias (0.3 mm drill, 1.0 mm pitch) to an inner ground plane. Estimated: with theta-JA around 30 C/W and total AVDD + OVDD dissipation of about 200 mW at full 65 Msps dual-channel operation, junction temperature rise is approximately 6 C above ambient, well within the 70 C commercial limit.
Place a 1 uF X7R ceramic decoupling capacitor within 2 mm of each AVDD and OVDD pin, plus a 0.1 uF high-frequency bypass in parallel. Use an isolated analog ground island on the top layer connected to the system ground at a single point near the ADC, with the digital output return currents kept physically away from the analog input traces to avoid switching noise coupling into the front end.
Drive the ENC+ / ENC- clock input differentially using a low-jitter clock generator such as the LTC6953 or a high-speed LVDS buffer. Differential clocks minimize aperture jitter and maximize SFDR. Keep the clock trace impedance matched to 100 ohms differential and short - ideally under 25 mm - to limit PCB-induced jitter that would otherwise degrade SNR at high analog input frequencies.
Do not operate the ADC with the exposed pad unsoldered - thermal runaway and degraded ground return will cause ADC output errors. Do not leave the digital outputs disconnected - unused LVDS/CMOS outputs must be terminated per the datasheet. Do not exceed 1.9 V on AVDD or OVDD; the absolute maximum is 2.0 V. Do not multiplex a single analog input to both channels - the architecture assumes two independent analog sources for true simultaneous sampling.
מידע על תאימות
RoHS and REACH compliant per PBF suffix on DigiKey / Mouser listing. Not AEC-Q100 qualified - use automotive-qualified ADC families for automotive applications. Halogen-free per JEDEC JS709B for the #PBF finish.