LTC2258IUJ-12 - 12-Bit 65Msps Ultralow Power ADC | Analog Devices
부품 번호: LTC2258IUJ-12 ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $45.04 | $45.04 |
| 10 | $40.5 | $405.00 |
| 100 | $35.95 | $3,595.00 |
| 500 | $31.8 | $15,900.00 |
| 1,000 | $28.2 | $28,200.00 |
LTC2258IUJ-12 개요
An analog-to-digital converter (ADC) is a semiconductor device that converts continuous analog signals into discrete digital codes, enabling downstream processing by microcontrollers, DSPs, or FPGAs. Pipelined ADCs such as the LTC2258IUJ-12 use a multi-step sample-and-hold and sub-ADC architecture to achieve sampling rates from 25 msps to over 1 msps while maintaining low power consumption. Within the broader signal-chain hierarchy, the ADC sits between the analog sensor or amplifier stage and the digital processor, and its dynamic range, SNR, and SFDR directly set system-level performance in communications, imaging, and instrumentation applications.
Key specifications include 71.1 dB SNR and 88 dB spurious-free dynamic range (SFDR) at 65 msps input frequency, 0.3 LSB INL (typical) and 0.1 LSB DNL (typical) with no missing codes over temperature, and 0.3 LSB RMS transition noise. The digital outputs can be configured as full-rate CMOS, double-data-rate CMOS, or double-data-rate LVDS, while a separate output power supply allows the CMOS output swing to range from 1.2 V to 1.8 V for direct interface to modern ASICs and FPGAs.
The pipelined architecture samples input signals above 70 MHz while the ultralow-power 1.8 V operation minimizes thermal dissipation, enabling compact layouts without aggressive thermal management. Programmable operating modes are accessible through either a parallel interface or a more flexible serial interface. The exposed-pad 40-lead QFN package keeps the device footprint at 36 mm^2 while providing a low thermal-resistance path.
Typical applications include cellular base-station receivers, IF-sampling software-defined radios, portable imaging systems, and low-power instrumentation. The wide LVDS/CMOS output flexibility and low-power 1.8 V operation make it well suited to battery-powered and densely populated boards.
When designing with this device, place input capacitors directly at the analog input pins and route output clocks with controlled impedance to minimize coupling into the analog input. A clean unbroken ground plane is recommended, and a multilayer PCB with an internal ground plane is preferred to preserve AC performance.
This page synthesizes distributor pricing, same-family drop-in alternatives from the LTC2257-12 and LTC2256-12 families, and practical PCB design notes that complement the manufacturer datasheet and typical application circuit.
드롭인 대체품: LTC2258IUJ-12 — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: LTC2258IUJ-12 (동일 폼 팩터 및 풋프린트) — 차이점: Package, Input Type, Architecture, Missing Codes, Resolution.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
LTC2257CUKJ-12
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
LTC2256IUJ-12
✅ 드롭인✓ 재고 있음
$4.9 / 개
데이터시트 보기 →LTC2257CUJ-12
✅ 드롭인✓ 재고 있음
$16.8 / 개
데이터시트 보기 →LTC2258IUJ-12#PBF
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
LTC2258IUJ-12#TRPBF
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
LTC2258IUJ-12 최대 정격 & 전기적 특성
| Manufacturer | Analog Devices |
| MPN | LTC2258IUJ-12 |
| Product Type | Analog-to-Digital Converter (ADC) |
| 분해능 | 12 bit |
| Number of Channels | 1 |
| 샘플링 속도 | 65 Msps |
| Architecture | Pipelined |
| Input Type | Single-ended analog input |
| Analog Supply Voltage | 1.8 V |
| Digital I/O Supply | 1.2 V to 1.8 V (CMOS mode) |
| SNR | 71.1 dB |
| SFDR | 88 dB |
| INL (typical) | 0.3 LSB |
| DNL (typical) | 0.1 LSB |
| Transition Noise | 0.3 LSB RMS |
| Missing Codes | No missing codes over temperature |
| Digital Output Modes | Full-rate CMOS, DDR CMOS, or DDR LVDS |
| 패키지 | 40-QFN (UJ) 6 mm x 6 mm with exposed pad |
| 실장 유형 | Surface Mount |
| RoHS 상태 | Compliant |
LTC2258IUJ-12 핀 구성
| 핀 1 | GND — Ground reference for analog section |
| 핀 2 | AIN+ — Differential analog input (positive) |
| 핀 3 | AIN- — Differential analog input (negative) |
| 핀 4 | VCM — Common-mode voltage output for analog input |
| 핀 5 | REFT — Positive reference decoupling |
| 핀 6 | REFB — Negative reference decoupling |
| 핀 7 | REFIN — Reference voltage input (internal reference bypassed with cap to GND) |
| 핀 8 | GND — Ground |
| 핀 9 | VDD — 1.8 V analog supply |
| 핀 10 | GND — Ground |
| 핀 11 | CLK+ — Differential sample clock input (positive) |
| 핀 12 | CLK- — Differential sample clock input (negative) |
| 핀 13 | GND — Ground |
| 핀 14 | OVDD — Digital output supply (1.2 V to 1.8 V) |
| 핀 15 | OGND — Digital output ground |
| 핀 16 | DCO+ — DDR data clock output (positive) |
| 핀 17 | DCO- — DDR data clock output (negative) |
| 핀 18 | OR+ — LVDS/CMOS out-of-range bit (positive) |
| 핀 19 | OR- — LVDS/CMOS out-of-range bit (negative) |
| 핀 20 | D0+ — LVDS/CMOS data bit 0 (positive) |
| 핀 21 | D0- — LVDS/CMOS data bit 0 (negative) |
| 핀 22 | D1+ — LVDS/CMOS data bit 1 (positive) |
| 핀 23 | D1- — LVDS/CMOS data bit 1 (negative) |
| 핀 24 | D2+ — LVDS/CMOS data bit 2 (positive) |
| 핀 25 | D2- — LVDS/CMOS data bit 2 (negative) |
| 핀 26 | D3+ — LVDS/CMOS data bit 3 (positive) |
| 핀 27 | D3- — LVDS/CMOS data bit 3 (negative) |
| 핀 28 | D4+ — LVDS/CMOS data bit 4 (positive) |
| 핀 29 | D4- — LVDS/CMOS data bit 4 (negative) |
| 핀 30 | D5+ — LVDS/CMOS data bit 5 (positive) |
| 핀 31 | D5- — LVDS/CMOS data bit 5 (negative) |
| 핀 32 | D6+ — LVDS/CMOS data bit 6 (positive) |
| 핀 33 | D6- — LVDS/CMOS data bit 6 (negative) |
| 핀 34 | D7+ — LVDS/CMOS data bit 7 (positive) |
| 핀 35 | D7- — LVDS/CMOS data bit 7 (negative) |
| 핀 36 | D8+ — LVDS/CMOS data bit 8 (positive) |
| 핀 37 | D8- — LVDS/CMOS data bit 8 (negative) |
| 핀 38 | D9+ — LVDS/CMOS data bit 9 (positive) |
| 핀 39 | D9- — LVDS/CMOS data bit 9 (negative) |
| 핀 40 | GND — Ground (exposed pad also serves as thermal/ground pad) |
일반적인 애플리케이션
LTC2258IUJ-12 적합 용도: 6 애플리케이션s: Cellular Base Station Receiver, IF Sampling Software Defined Radio, Portable Imaging Systems, Low-Power Instrumentation and Data Acquisition, Radar and Lidar Signal Acquisition, Industrial Process Control.
Cellular Base Station Receiver
The LTC2258IUJ-12 is well suited to cellular base-station IF and diversity-receiver signal chains because its 71.12 dB SNR and 88 dB SFDR deliver the dynamic range needed to resolve adjacent-channel blockers in WCDMA and LTE receivers. The 65 Msps sample rate is sufficient to digitize intermediate frequencies above 70 MHz without aliasing, and the LVDS DDR output mode drives FPGA SERDES blocks directly. Ultralow 1.8 V operation simplifies power-tree design in thermally dense base-station chassis. Recommended companion parts include an RF front-end amplifier and a clock distribution buffer for the sample clock.
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IF Sampling Software Defined Radio
In IF-sampling software-defined radios, the LTC2258IUJ-12 captures wide-bandwidth intermediate-frequency outputs from one or more tuners and feeds the digital data directly into an FPGA for channelization. The 88 dB SFDR prevents receiver desensitization from harmonic spurs, while the DDR LVDS output mode keeps pin count and board area low. The 1.8 V supply rail is compatible with common SDR reference designs that power ADCs from the same LDO as the FPGA transceivers. The 40-QFN (6x6 mm) footprint fits next to the FPGA on a 4-layer PCB.
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Portable Imaging Systems
Portable digital-imaging platforms such as handheld ultrasound and industrial borescopes benefit from the LTC2258IUJ-12's combination of 12-bit dynamic range, 65 Msps throughput, and ultralow 1.8 V power dissipation. The 0.3 LSB INL preserves grayscale linearity, while the no-missing-codes guarantee maintains diagnostic accuracy over the operating temperature range. Battery-powered designs leverage the lower power to extend run time without sacrificing image quality. The exposed-pad QFN provides a low-impedance thermal path for continuous imaging sessions.
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Low-Power Instrumentation and Data Acquisition
The LTC2258IUJ-12 supports compact, battery-powered data-acquisition front ends where channel density and thermal budget are constrained. The 0.3 LSB RMS transition noise delivers repeatable measurement accuracy, while the ultralow 1.8 V analog supply minimizes dissipation on multi-channel boards. The parallel programming interface enables deterministic configuration at power-up, and the DDR CMOS mode reduces pin count when interfacing with low-cost microcontrollers. This combination makes the part attractive for handheld oscilloscopes, vibration analyzers, and portable spectrum analyzers.
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Radar and Lidar Signal Acquisition
Pulsed radar and lidar receivers require ADCs that capture narrow pulse returns with high dynamic range; the LTC2258IUJ-12's 71.1 dB SNR and 88 dB SFDR preserve target-to-clutter ratios required for object detection. The 65 Msps sample rate supports IF sampling of baseband-derived return pulses, while the LVDS DDR output mode interfaces to FPGA DSP pipelines for matched filtering. The 1.8 V operation simplifies power design for vehicular and outdoor installations. The exposed-pad QFN keeps the footprint small for densely packed sensor modules.
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Industrial Process Control
Industrial process-control systems digitize 4-20 mA and 0-10 V sensor outputs through isolation barriers; the LTC2258IUJ-12's 71.1 dB SNR captures sensor information while rejecting 50/60 Hz line noise when paired with digital filtering. The wide digital I/O range (1.2-1.8 V) interfaces directly to industrial FPGAs and SoCs without level translation. The 1.8 V analog supply simplifies the on-board isolated DC-DC design. The 40-QFN package and exposed pad provide robust mechanical and thermal performance in factory-floor environments.
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추천 제품 요약
엔지니어링 참조 데이터: LTC2258IUJ-12 — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | LTC2257CUKJ-12 | LTC2256IUJ-12 | LTC2257CUJ-12 | LTC2258IUJ-12#PBF | LTC2258IUJ-12#TRPBF |
|---|---|---|---|---|---|---|
| Package | 40-QFN (UJ) 6x6 mm | 40-QFN (UJ) - same | 40-QFN (UJ) - same | 40-QFN (UJ) - same | 40-QFN (UJ) - same | 40-QFN (UJ) - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit |
| Sampling Rate | 65 Msps | 40 Msps | 25 Msps | 40 Msps | 65 Msps | 65 Msps |
| SNR | 71.1 dB | 71.1 dB | 71.1 dB | 71.1 dB | 71.1 dB | 71.1 dB |
| SFDR | 88 dB | 88 dB | 88 dB | 88 dB | 88 dB | 88 dB |
| Analog Supply | 1.8 V | 1.8 V | 1.8 V | 1.8 V | 1.8 V | 1.8 V |
| Output Mode | CMOS / DDR CMOS / DDR LVDS | CMOS / DDR CMOS / DDR LVDS | CMOS / DDR CMOS / DDR LVDS | CMOS / DDR CMOS / DDR LVDS | CMOS / DDR CMOS / DDR LVDS | CMOS / DDR CMOS / DDR LVDS |
| Architecture | Pipelined | Pipelined | Pipelined | Pipelined | Pipelined | Pipelined |
| Channels | 1 | 1 | 1 | 1 | 1 | 1 |
주요 차별점
- Highest sample rate in the 12-bit 1.8 V family (vs LTC2257IUJ-12 (40 Msps))
- Direct FPGA SERDES compatibility via DDR LVDS (vs CMOS-only older ADCs)
- Separate OVDD enables 1.2-1.8 V digital interface (vs Single-supply 12-bit ADCs)
설계 노트
The LTC2258IUJ-12 datasheet requires a printed circuit board with a clean unbroken ground plane, and a multilayer board with an internal ground plane is recommended. Route the differential clock CLK+/- with 50/100 ohm controlled-impedance traces, keep the analog input traces short and symmetric, and isolate the digital output bus from the analog input to preserve the 88 dB SFDR. Decouple VDD and OVDD close to the package pins with 0.1 uF and 10 uF ceramic capacitors per supply pin.
Source the LTC2258IUJ-12 sample clock from a low-jitter oscillator or PLL (such as the AD9516 family) to avoid degrading SNR and SFDR. The differential clock input CLK+/CLK- requires AC coupling or DC biasing per the datasheet, and the input trace impedance should match the source. Avoid routing the digital output bus parallel to the analog input - a guard ground via fence between them reduces coupling. Use the exposed pad (pin 40) as the primary thermal dissipation path; solder it to a large ground copper pour.
Do not bypass the reference decoupling capacitors at REFT and REFB - these pins must each have a low-ESR ceramic capacitor to GND per the reference data sheet, otherwise INL degrades and DC offset drifts. Ensure that the analog input common-mode voltage (VCM pin) is buffered by the source amplifier (AD8138 or equivalent) to avoid pattern-dependent distortion. When switching between CMOS and LVDS output modes, observe the supply sequencing requirement: apply OVDD before driving the digital outputs to avoid latch-up.
규정 준수 정보
RoHS and REACH compliance per Analog Devices product environmental policy. AEC-Q100 not applicable - this is an industrial/commercial ADC, not an automotive qualified part.
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