LTC2258CUJ-14 - 14-Bit, 65Msps Ultralow Power 1.8V ADC | ADI
MPN: LTC2258CUJ-14 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $18.75 | $18.75 |
| 10 | $16.95 | $169.50 |
| 100 | $14.5 | $1,450.00 |
| 500 | $12.85 | $6,425.00 |
| 1,000 | $11.4 | $11,400.00 |
LTC2258CUJ-14 Overview
An ADC (analog-to-digital converter) is a semiconductor device that converts continuous analog signals into discrete digital codes at a defined sample rate. In the broader hierarchy, the LTC2258CUJ-14 sits within successive-approximation/pipelined ADCs -> data converters -> signal chain ICs -> mixed-signal semiconductors. Pipelined ADCs like this one are optimized for high sample rates (tens of Msps and above) where SAR converters would consume more energy per conversion. The LTC2258 family specifically targets the 14-bit, 25-65 Msps segment with sub-100 mW power dissipation.
Key features include ±1 LSB INL (typical), ±0.3 LSB DNL (typical) and no missing codes over temperature, with 1.13 LSB RMS transition noise. The digital outputs can be configured as full-rate CMOS, double-data-rate CMOS, or double-data-rate LVDS, and a separate output supply rail allows the CMOS swing to range from 1.2V to 1.8V for flexible host interface compatibility. According to the manufacturer datasheet, the family also integrates an SPI configuration port plus shutdown and nap power-saving modes, with optional clock duty cycle stabilization.
Architecturally, the device pairs a switched-capacitor input network with a multi-stage pipelined quantizer and on-chip reference. The ultralow power dissipation is achieved through a 1.8V core supply and aggressive clock gating during nap and shutdown modes. The integrated PGA simplifies front-end design by allowing direct coupling of single-ended or differential signals without an external driver op-amp in many cases.
Typical applications include communications baseband and IF sampling, handheld spectrum analyzers, medical imaging (including portable ultrasound front ends), and industrial data acquisition front ends. When designing with this part, attention should be paid to analog input common-mode voltage, LVDS/CMOS output bus routing, and the recommended decoupling network to achieve the datasheet SNR/SFDR performance. A separate output supply pin allows the CMOS logic swing to be matched to the host ASIC/FPGA I/O voltage without level shifters.
This page synthesizes distributor pricing, same-package pin-compatible variants, application pairing guidance, and PCB/design notes not found in the bare datasheet, allowing engineers to compare drop-in alternatives and second-source the LTC2258CUJ-14 in volume production.
Drop-in alternatives for LTC2258CUJ-14 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with LTC2258CUJ-14 (same form factor and footprint) — differing in Package, Sample Rate, Transition Noise, DNL (typical), INL (typical).
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LTC2258CUJ-12
✅ Drop-In✓ In Stock
$19.95 / Unit
View Datasheet →LTC2257CUJ-14
✅ Drop-In✓ In Stock
$10.4 / Unit
View Datasheet →LTC2257CUJ-12
✅ Drop-In✓ In Stock
$16.8 / Unit
View Datasheet →LTC2256CUJ-14
✅ Drop-In✓ In Stock
$6.9 / Unit
View Datasheet →LTC2151CUJ-14
✅ Drop-In✓ In Stock
$29.1 / Unit
View Datasheet →LTC2150CUJ-14
✅ Drop-In✓ In Stock
$41.58 / Unit
View Datasheet →LTC2258CUJ-14 Maximum Ratings & Electrical Characteristics
| Resolution | 14 bit |
| Sample Rate | 65 Msps |
| Architecture | Pipelined |
| Number of Channels | 1 input |
| Supply Voltage | 1.8 V |
| INL (typical) | ±1 LSB |
| DNL (typical) | ±0.3 LSB |
| Missing Codes | None over temperature |
| Transition Noise | 1.13 LSB RMS |
| Digital Output Modes | Full-rate CMOS / DDR CMOS / DDR LVDS |
| CMOS Output Supply Range | 1.2 V to 1.8 V |
| Configuration Interface | Serial SPI port |
| Power-Saving Modes | Shutdown, Nap |
| Clock Duty Cycle Stabilizer | Optional, on-chip |
| Package | 40-QFN (6mm x 6mm) |
| Pin-Compatible Family Members | LTC2258-14 / LTC2257-14 / LTC2256-14 |
| RoHS Status | Compliant (PBF suffix) |
LTC2258CUJ-14 40-qfn (6mm x 6mm) Pin Configuration Guide
Pin configuration for LTC2258CUJ-14 (40-qfn (6mm x 6mm) package). This analog component features input, output, and power supply pins. Refer to the manufacturer datasheet for offset null, compensation, and enable pin configurations. Ideal for signal conditioning and amplifier circuits.
No detailed pinout data available for LTC2258CUJ-14.
Refer to the datasheet for full pin configuration.
Typical Applications
LTC2258CUJ-14 is suitable for 6 applications: Handheld Battery-Powered Instruments, Communications Imaging and IF Sampling, Portable Ultrasound Front End, Software-Defined Radio Baseband, Industrial Low-Power Instrumentation, Spectrum Analyzer and Signal Intelligence.
Handheld Battery-Powered Instruments
The LTC2258CUJ-14's 1.8 V single-supply operation and ultralow power dissipation make it ideal for handheld, battery-powered test and measurement instruments where every milliwatt extends runtime. According to datasheet 225814fc, the integrated PGA accepts single-ended or differential inputs directly, eliminating an external driver op-amp and saving board area in compact portable form factors. The 65 Msps sample rate supports real-time FFT analysis up to ~30 MHz input bandwidth, while the nap and shutdown modes let firmware cut ADC quiescent current between captures. Use this ADC as the front end of a handheld oscilloscope, spectrum analyzer, or field data logger where wide dynamic range (no missing codes) and low noise floor (1.13 LSB RMS) are mandatory.
Recommended
Communications Imaging and IF Sampling
The LTC2258CUJ-14 samples wide dynamic range IF signals in communications receivers, with 14-bit resolution capturing small modulation sidebands above a large blocker. Per the Analog Devices product page, the LVDS and DDR CMOS output options reduce digital bus EMI, critical when routing the data into an adjacent FPGA on the same PCB. The 65 Msps rate supports Nyquist sampling of IF frequencies up to ~32 MHz, well matched to cellular, land-mobile-radio, and satellite IF stages. The configurable OVDD from 1.2 V to 1.8 V lets the ADC connect directly to low-power FPGAs and baseband ASICs without level shifters. The integrated clock duty cycle stabilizer relaxes upstream clock jitter requirements.
Recommended
Portable Ultrasound Front End
The LTC2258CUJ-14's 14-bit, 65 Msps performance at 1.8 V is well suited to portable ultrasound beamformer front ends where channel count, power, and noise must all be balanced. Per datasheet 225814fc, no missing codes over temperature preserves image integrity across clinical operating ranges, while the ultralow noise floor supports the dynamic range needed for low-amplitude echo detection. The 40-lead QFN package allows dense multi-channel array PCB layouts. LVDS output mode enables long-distance routing from transducer boards to the central processor without EMI pickup degrading the digital data. Lower sample-rate family members (LTC2257/2256) can be used for lower-frequency imaging channels.
Recommended
Software-Defined Radio Baseband
The LTC2258CUJ-14 captures I/Q baseband signals in software-defined radio (SDR) platforms requiring 14-bit dynamic range to handle both large and small signals simultaneously. According to datasheet 225814fc, the LVDS DDR output mode minimizes pin count on the bus, freeing board area for RF front-end components and DSP/FPGA processors. The 65 Msps rate supports baseband bandwidths up to ~30 MHz, well matched to many narrowband and broadband waveforms used in public-safety, military, and amateur radio. The integrated PGA accepts direct-coupled differential signals from a preceding quadrature demodulator, simplifying the analog chain.
Recommended
Industrial Low-Power Instrumentation
The LTC2258CUJ-14 serves as the ADC front end in industrial data acquisition modules where 4-20 mA loop-powered or solar-powered operation demands ultralow dissipation from a single 1.8 V rail. Per the Analog Devices product page, the SPI configuration port plus shutdown/nap modes let a microcontroller wake the ADC, capture, and sleep, dramatically lowering system standby current. The 14-bit, 65 Msps performance captures sensor outputs from strain gauges, load cells, accelerometers, and temperature bridges after signal conditioning. The wide operating temperature range (per the CUJ suffix) supports factory-floor deployments.
Recommended
Spectrum Analyzer and Signal Intelligence
The LTC2258CUJ-14 provides the sample rate, resolution, and SFDR needed for entry-level spectrum analyzers and signal-intelligence receivers where small signals must be resolved in the presence of large out-of-band tones. According to datasheet 225814fc, ±1 LSB INL and ±0.3 LSB DNL preserve spectral integrity, and the 1.13 LSB RMS transition noise enables clean noise-floor measurements. The LVDS DDR bus supports long board traces to a host FPGA without EMI, while the SPI port allows in-system gain and mode reconfiguration. The 6mm x 6mm QFN package permits high-density multi-board channel stacking.
Recommended
Recommended Products Summary
Engineering reference data for LTC2258CUJ-14 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LTC2258CUJ-12 | LTC2257CUJ-14 | LTC2257CUJ-12 | LTC2256CUJ-14 | LTC2151CUJ-14 | LTC2150CUJ-14 |
|---|---|---|---|---|---|---|---|
| Brand | Analog Devices | 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 | 40-QFN (6x6) - same |
| Resolution | 14 bit | 12 bit | 14 bit | 12 bit | 14 bit | 14 bit | 14 bit |
| Supply Voltage | 1.8 V | 1.8 V | 1.8 V | 1.8 V | 1.8 V | 1.8 V | 1.8 V |
| Architecture | Pipelined | Pipelined | Pipelined | Pipelined | Pipelined | Pipelined | Pipelined |
| Pin-Compatible Family | LTC2258-14 / LTC2257-14 / LTC2256-14 (14-bit and 12-bit) | Same QFN-40 family, 12-bit | Same QFN-40 family, 40 Msps | Same QFN-40 family, 40 Msps 12-bit | Same QFN-40 family, 25 Msps | Different family (LTC215x), verify pinout | Different family (LTC215x), verify pinout |
Key Differentiators
- Pin-compatible 65/40/25 Msps family at 14-bit and 12-bit resolution (vs LTC2257CUJ-14)
- DDR LVDS digital output reduces bus pin count and EMI (vs Full-rate CMOS only ADCs (LTC222x legacy family))
- Separate OVDD supply from 1.2 V to 1.8 V (vs Single-supply competitors without OVDD)
- Integrated PGA and clock duty cycle stabilizer (vs ADCs requiring external driver op-amp)
Design Notes
Place the LTC2258CUJ-14 on a quiet analog island of the PCB with a continuous ground pour beneath and around the QFN exposed pad, which must be soldered to the ground plane for both thermal dissipation and low-inductance ground. Route analog inputs IN+ and IN- as a 100-ohm differential microstrip using length-matched traces, and keep them away from the CMOS/LVDS digital output bus and SPI lines. Place the AVDD 1.8 V decoupling network (1 uF + 0.1 uF + 10 uF) within 2 mm of the AVDD pins, and provide a separate ferrite-bead-isolated analog 1.8 V rail from a low-noise LDO.
Use the optional clock duty cycle stabilizer for clock sources whose duty cycle deviates from 50%, especially when driving the LTC2258CUJ-14 from an FPGA LVDS output. Provide a low-jitter, low-phase-noise sampling clock (aperture jitter below 0.5 ps RMS) to preserve SNR/SFDR at high input frequencies. Match the 50-ohm differential LVDS output trace lengths to the host FPGA, and add a 100-ohm differential termination at the receiver end. For CMOS output mode, route each output on a controlled-impedance trace with a small series damping resistor to limit simultaneous switch-on/off noise injection into the analog supply.
Do not apply analog inputs before AVDD and OVDD are both powered; the part has no internal power-on-reset that holds the outputs in Hi-Z. Configure unused digital output pins per the datasheet (typically tied to OVDD or GND through a defined impedance) to avoid floating nodes injecting noise into the substrate. Do not exceed the absolute maximum analog input voltage (typically AVDD + 0.3 V); a transient on the input can latch up the front-end. When switching between full-rate CMOS and DDR LVDS modes, re-assert OVDD and reset the part through the SPI RESET bit before sampling.
Use a low-noise 1.8 V LDO such as the LT3042 or LT3022 to generate AVDD, with a separate 1.8 V (or 1.2 V / 1.5 V) supply for OVDD to keep digital switching noise out of the analog rail. Per datasheet 225814fc, the part includes nap and shutdown modes that the host MCU can use between captures to drop quiescent current to microampere levels, dramatically extending battery runtime in portable applications. Decouple both AVDD and OVDD with a 10 uF bulk + 1 uF + 0.1 uF ceramic capacitor network as close as possible to the package pins.
Compliance Information
RoHS compliance indicated by the #PBF suffix per Analog Devices part-numbering convention; AEC-Q100 not applicable for commercial/industrial-grade converters in the CUJ temperature range.
