LTC2285CUP - Dual 14-Bit 125Msps Low-Power 3V ADC | ADI
MPN: LTC2285CUP ✓ AktifLTC2285CUP Ringkasan
A pipelined ADC is a multi-stage conversion architecture that uses a cascade of low-resolution flash stages and digital correction logic to achieve high sampling rates with moderate-to-high resolution, while consuming far less power than a full-flash converter of equivalent resolution. The LTC2285CUP sits in the product hierarchy of: ADC -> data converter -> signal chain IC -> mixed-signal semiconductor, and is a member of ADI's broad family of low-power, high-performance 3V ADCs.
Key features of the LTC2285CUP include dual 14-bit 125 MSPS conversion, integrated input PGA, single 3V supply operation, low power dissipation near 235 mW total at full speed, and pin-selectable input ranges. Differential inputs with on-chip track-and-hold circuits minimize aperture jitter, and an internal duty-cycle stabilizer compensates for variations in the clock duty cycle to preserve SNR at high input frequencies.
Typical applications include cellular base-station receiver IF digitizers, ultrasound imaging front ends, cable head-end digital receivers, and high-speed digital oscilloscopes. When using the LTC2285CUP, careful attention should be paid to analog input common-mode voltage and clock jitter: the SNR degrades with finite clock aperture jitter, so designers should use a low-jitter clock source and follow ADI's standard 50-ohm matched differential input network to preserve AC performance. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not consolidated in the manufacturer datasheet, helping engineers shorten part selection and BOM qualification cycles.
Alternatif penggantian untuk LTC2285CUP — 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 LTC2285CUP (sama faktor bentuk dan footprint) — berbeda di dalam RoHS Status, Package, SFDR, Number of Channels, Resolution.
LTC2285IUP
✅ Drop-In📋 Alternatif referensi (tidak dalam katalog)
LTC2282CUP
✅ Drop-InKontak untuk harga
Lihat Datasheet →LTC2280CUP
✅ Drop-InKontak untuk harga
Lihat Datasheet →LTC2283CUP
✅ Drop-In ⚠️ Spesifikasi Tidak DisahkanKontak untuk harga
Lihat Datasheet →LTC2241IUP-12
✅ Drop-In ⚠️ Spesifikasi Tidak DisahkanKontak untuk harga
Lihat Datasheet →LTC2285CUP Rating Maksimal & Karakteristik Listrik
| Manufacturer | Analog Devices Inc. |
| Resolusi | 14 bit |
| Number of Channels | 2 (Dual) |
| Laju Pengambilan Sampel | 125 MSPS |
| Architecture | Pipelined |
| Input Type | Differential / Single-Ended |
| Tegangan Pemuat | 2.85 V to 3.4 V (3 V nominal) |
| Power Dissipation | 235 mW typical (dual, full rate) |
| SNR | 72.2 dB at Nyquist input |
| SFDR | 82 dB at Nyquist input |
| Input Range | 1 Vp-p-p pk to 2 Vp-p differential, pin selectable |
| Integral Nonlinearity (INL) | ±1 LSB typical |
| Package Type | 64-QFN (9x9 mm) - HVQCCN |
| Suhu Kerja | 0C to +70C (Commercial grade) |
| Status RoHS | Compliant |
| Lead-Free / PBF | Yes (#PBF suffix variants) |
| Tipe Mounting | Surface Mount |
Konfigurasi Pin LTC2285CUP
| Pin produk 1 | AIN1+ — Channel 1 differential analog input positive |
| Pin produk 2 | AIN1- — Channel 1 differential analog input negative |
| Pin produk 3 | VCM1 — Common-mode voltage reference, channel 1 |
| Pin produk 4 | SENSE — Input range select |
| Pin produk 5 | GND — Analog ground |
| Pin produk 6 | VDD — Analog 3V supply |
| Pin produk 7 | VREF — Voltage reference bypass |
| Pin produk 8 | OGND — Output driver ground |
| Pin produk 9 | OVDD — Output driver supply |
| Pin produk 10 | CLK+ — Clock input positive |
| Pin produk 11 | CLK- — Clock input negative |
| Pin produk 12 | D0_1 — Channel 1 data output bit 0 (LSB) |
| Pin produk 13 | D1_1 — Channel 1 data output bit 1 |
| Pin produk 14 | D2_1 — Channel 1 data output bit 2 |
| Pin produk 15 | D3_1 — Channel 1 data output bit 3 |
| Pin produk 16 | D4_1 — Channel 1 data output bit 4 |
| Pin produk 17 | D5_1 — Channel 1 data output bit 5 |
| Pin produk 18 | D6_1 — Channel 1 data output bit 6 |
| Pin produk 19 | D7_1 — Channel 1 data output bit 7 |
| Pin produk 20 | D8_1 — Channel 1 data output bit 8 |
| Pin produk 21 | D9_1 — Channel 1 data output bit 9 |
| Pin produk 22 | D10_1 — Channel 1 data output bit 10 |
| Pin produk 23 | D11_1 — Channel 1 data output bit 11 |
| Pin produk 24 | D12_1 — Channel 1 data output bit 12 |
| Pin produk 25 | D13_1 — Channel 1 data output bit 13 (MSB) |
| Pin produk 26 | OF_1 — Channel 1 overflow flag |
| Pin produk 27 | ENC1+ — Channel 1 encode clock positive (output) |
| Pin produk 28 | ENC1- — Channel 1 encode clock negative (output) |
| Pin produk 29 | OVDD — Output driver supply |
| Pin produk 30 | OGND — Output driver ground |
| Pin produk 31 | OF_2 — Channel 2 overflow flag |
| Pin produk 32 | D13_2 — Channel 2 data output bit 13 (MSB) |
| Pin produk 33 | D12_2 — Channel 2 data output bit 12 |
| Pin produk 34 | D11_2 — Channel 2 data output bit 11 |
| Pin produk 35 | D10_2 — Channel 2 data output bit 10 |
| Pin produk 36 | D9_2 — Channel 2 data output bit 9 |
| Pin produk 37 | D8_2 — Channel 2 data output bit 8 |
| Pin produk 38 | D7_2 — Channel 2 data output bit 7 |
| Pin produk 39 | D6_2 — Channel 2 data output bit 6 |
| Pin produk 40 | D5_2 — Channel 2 data output bit 5 |
| Pin produk 41 | D4_2 — Channel 2 data output bit 4 |
| Pin produk 42 | D3_2 — Channel 2 data output bit 3 |
| Pin produk 43 | D2_2 — Channel 2 data output bit 2 |
| Pin produk 44 | D1_2 — Channel 2 data output bit 1 |
| Pin produk 45 | D0_2 — Channel 2 data output bit 0 (LSB) |
| Pin produk 46 | OVDD — Output driver supply |
| Pin produk 47 | OGND — Output driver ground |
| Pin produk 48 | MODE — Output mode / test mode select |
| Pin produk 49 | CS — Chip select (SPI control) |
| Pin produk 50 | SCK — Serial clock (SPI control) |
| Pin produk 51 | SDI — Serial data input (SPI control) |
| Pin produk 52 | SDO — Serial data output (SPI control) |
| Pin produk 53 | GAIN — Gain adjust / calibration |
| Pin produk 54 | CAL — Calibration pin |
| Pin produk 55 | MUX — Multiplexed channel select |
| Pin produk 56 | VCM2 — Common-mode voltage reference, channel 2 |
| Pin produk 57 | AIN2- — Channel 2 differential analog input negative |
| Pin produk 58 | AIN2+ — Channel 2 differential analog input positive |
| Pin produk 59 | GND — Analog ground |
| Pin produk 60 | VDD — Analog 3V supply |
| Pin produk 61 | VREF — Voltage reference bypass |
| Pin produk 62 | ENC2- — Channel 2 encode clock negative (output) |
| Pin produk 63 | ENC2+ — Channel 2 encode clock positive (output) |
| Pin produk 64 | GND — Analog ground / exposed pad |
Aplikasi Umum
LTC2285CUP cocok untuk 6 aplikasis: Cellular Base-Station Receiver IF Sampling, Ultrasound Imaging Front End, Cable Head-End Digital Receiver, High-Speed Digital Oscilloscope / Data Acquisition, Software Defined Radio (SDR) Wideband Digitizer, Industrial Non-Destructive Testing (NDT) Imaging.
Cellular Base-Station Receiver IF Sampling
The LTC2285CUP is well-suited for cellular base-station IF sampling because its dual 14-bit, 125 MSPS conversion and 72.2 dB SNR enable high dynamic range digitization of intermediate-frequency signals. The on-chip duty-cycle stabilizer preserves SNR with practical 30 to 50 percent duty clocks commonly generated in base-station ASICs, and the 64-QFN package supports standard 50-ohm matched differential input networks. AC performance is 82 dB SFDR at Nyquist, comfortably exceeding 3GPP spurious requirements for multi-carrier GSM/WCDMA receivers. Designers typically place the LTC2285CUP downstream of an IF SAW filter, with the analog inputs AC-coupled through a 1:1 transformer or differential driver such as the AD8138. Estimated power dissipation is approximately 235 mW at 125 MSPS, fitting standard fan-cooled line-card thermal envelopes.
Direkomendasikan
Ultrasound Imaging Front End
In ultrasound imaging the LTC2285CUP provides two simultaneous 14-bit, 125 MSPS channels for beamformed RF signal digitizing, with low 235 mW power enabling dense channel arrays. The 72.2 dB SNR and 82 dB SFDR support the wide dynamic range required to resolve small return echoes alongside strong reflectors, while the pin-selectable 1 or 2 Vp-p differential input range lets designers optimize full-scale headroom across transducer channels. Typical ultrasound front ends place the LTC2285CUP immediately after the LNA and time-gain compensation stage, AC-coupled with 50-ohm transformer networks. Low aperture jitter preserves phase coherence across receive channels, critical for phased-array beamforming accuracy. The 64-QFN (9x9 mm) footprint also suits compact probe-head electronics.
Direkomendasikan
Cable Head-End Digital Receiver
Cable head-end digital receivers digitize densely packed QAM carriers, demanding high spurious-free dynamic range from the ADC. The LTC2285CUP delivers 82 dB SFDR and 72.2 dB SNR at Nyquist, comfortably resolving hundreds of QAM channels aggregated onto a single ADC input. The dual-channel capability lets one LTC2285CUP digitize both I and Q paths of a complex demodulated IF, or two independent downstream bands. Per the Analog Devices datasheet, the part supports single 3V supply operation, simplifying head-end power tree design. Designers typically use a broadband balun network feeding the differential inputs, followed by a digital down-converter in the FPGA. The 64-QFN exposed pad aids thermal dissipation at continuous 125 MSPS dual-channel operation.
Direkomendasikan
High-Speed Digital Oscilloscope / Data Acquisition
The LTC2285CUP serves well in high-speed oscilloscope and data acquisition front ends where 14-bit resolution at 125 MSPS per channel strikes a balance between bandwidth and DC accuracy. Two simultaneous sampling channels support 2-channel scope architectures or time-interleaved higher-speed systems. The differential inputs reject common-mode noise in mixed analog/digital environments, while the on-chip track-and-hold minimizes aperture jitter for accurate transient capture. The 64-QFN (9x9 mm) package enables compact front-end PCBs, and the 235 mW typical dissipation eases thermal management in densely-populated instrument chassis. Designers typically clock the LTC2285CUP from a low-jitter TCXO and pair it with a high-bandwidth front-end attenuator and amplifier network.
Direkomendasikan
Software Defined Radio (SDR) Wideband Digitizer
Software defined radio platforms benefit from the LTC2285CUP's dual 14-bit 125 MSPS capability when digitizing IF or RF signals directly for FPGA-based digital down-conversion. With 72.2 dB SNR and 82 dB SFDR the ADC captures both strong and weak signals in contested RF environments, supporting multi-mode SDR receiver designs. The single 3V supply simplifies portable and rugged SDR power trees, and the 64-QFN exposed pad aids thermal dissipation in sealed enclosures. AC coupling through a wideband transformer network is standard, and designers often pair the LTC2285CUP with an FPGA such as the Xilinx Spartan-6 for real-time demodulation. The pin-selectable 1 or 2 Vp-p input range allows flexible matching to front-end LNA outputs.
Direkomendasikan
Industrial Non-Destructive Testing (NDT) Imaging
Industrial non-destructive testing systems, including ultrasonic flaw detectors and eddy-current arrays, leverage the LTC2285CUP's dual 14-bit 125 MSPS sampling to digitize high-bandwidth transducer return signals. The 72.2 dB SNR cleanly resolves small flaws in metallic structures, while the 82 dB SFDR suppresses harmonic distortion that could mimic defect signatures. Commercial 0C to +70C operation matches indoor NDT laboratory environments; for harsh-field deployments the pin-compatible LTC2285IUP is a drop-in upgrade. The 64-QFN footprint supports compact portable probe electronics, and single 3V operation simplifies battery-powered NDT instruments. Designers typically clock the LTC2285CUP from a stable TCXO and synchronize acquisition to a pulser-echo cycle.
Direkomendasikan
Ringkasan Produk Direkomendasikan
Data referensi engineering untuk LTC2285CUP — pembandingan, panduan desain, dan informasi konformitas.
Panduan Pemilihan
Pembandingan dengan Alternatif
| Parameter Umum | Produk Ini | LTC2285IUP | LTC2282CUP | LTC2280CUP | LTC2283CUP | LTC2241IUP-12 |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 64-QFN (9x9 mm) | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same |
| Resolution | 14 bit | 14 bit | 14 bit | 14 bit | 14 bit | 12 bit |
| Sampling Rate | 125 MSPS | 125 MSPS | 105 MSPS | 80 MSPS | 80 MSPS | 40 MSPS |
| Number of Channels | 2 (Dual) | 2 (Dual) | 2 (Dual) | 2 (Dual) | 2 (Dual) | 2 (Dual) |
| Operating Temperature | 0C to +70C (Commercial) | -40C to +85C (Industrial) | 0C to +70C (Commercial) | 0C to +70C (Commercial) | 0C to +70C (Commercial) | -40C to +85C (Industrial) |
| Supply Voltage | 3V (2.85 V to 3.4 V) | 3V (2.85 V to 3.4 V) | 3V (2.85 V to 3.4 V) | 3V (2.85 V to 3.4 V) | 3V (2.85 V to 3.4 V) | 3V (2.85 V to 3.4 V) |
Diferensiator Kunci
- Dual 14-bit 125 MSPS with 72.2 dB SNR at Nyquist (vsLTC2280CUP (80 MSPS))
- Industrial-grade drop-in option without PCB rework (vsLTC2285IUP)
- 14-bit resolution advantage over 12-bit family members (vsLTC2241IUP-12)
Catatan Desain
Place the LTC2285CUP analog input traces symmetrically and use 50-ohm controlled-impedance routing from the transformer secondary to the AIN1+/AIN1- and AIN2+/AIN2- pins. Length matching within 0.5 mm preserves the differential balance that maintains 72.2 dB SNR. Per the Analog Devices datasheet, the exposed thermal pad (pin 64) must be soldered to a continuous ground plane with multiple vias stitching the top and bottom layers for low-impedance return current.
Decouple each VDD pin with a 0.1 uF X7R ceramic capacitor placed within 2 mm of the pin, plus a 10 uF tantalum bulk capacitor on each supply plane. Use a ferrite bead to isolate analog VDD from digital OVDD to prevent digital switching noise from coupling into the analog front end. Estimated: with 235 mW typical dissipation at 125 MSPS dual-channel operation, the 64-QFN exposed pad keeps junction rise under 35C above ambient on a standard 4-layer 1 oz PCB.
Drive the CLK+/CLK- differential clock with a low-jitter source (typically less than 1 ps RMS). The LTC2285CUP SNR degrades proportionally to aperture jitter, so avoid using a 3V CMOS single-ended clock directly. Per the Analog Devices datasheet, an AC-coupled LVPECL or sinusoidal clock preserves the 72.2 dB SNR at Nyquist. The internal duty-cycle stabilizer compensates for 30 to 70 percent clock duty cycles but does not correct jitter.
Avoid routing the digital output bus (D0_1..D13_1, D0_2..D13_2, OF_1, OF_2) parallel to or beneath the analog input traces. Even on a 4-layer PCB, digital edge coupling can degrade SNR by 5 to 10 dB. Per the Analog Devices datasheet, place a ground pour between the analog and digital sections and route output traces on the opposite side of the PCB with matched 50-ohm impedance to the FPGA receiver bank.
Informasi Konformitas
RoHS and lead-free per Analog Devices product page. #PBF suffix indicates Pb-free compliance. Not AEC-Q100 qualified - choose industrial-grade variant for harsh environments.
