LTC2294CUP - Dual 12-Bit 80Msps 3V ADC | Analog Devices
MPN: LTC2294CUP ✓ Hoạt độngLTC2294CUP Tóm tắt
An ADC (analog-to-digital converter) is a mixed-signal integrated circuit that samples continuous analog voltages and outputs discrete digital codes at a fixed sampling rate. Pipelined ADCs, the architecture used in the LTC2294, cascade multiple low-resolution flash stages to achieve high sample rates (tens of Msps and above) with moderate power consumption and small die area. This makes them the dominant architecture for communications, imaging, and instrumentation applications requiring conversion of IF or baseband signals in the 1-100 MHz range.
Key specifications include 70.6 dB SNR and 90 dB SFDR at 70 MHz input, ±0.4 LSB INL (typical), ±0.2 LSB DNL (typical), 110 dB channel isolation at 100 MHz, and a flexible input range of 1 Vp-p to 2 Vp-p. Optional internal dither is provided to improve SFDR when the input approaches full-scale and the spectrum would otherwise exhibit integral non-linearity spurs. A separate output supply pin permits the digital outputs to drive 3V, 2.5V, or 1.8V logic without level shifters.
Typical applications include cellular base-station IF sampling, multi-channel imaging arrays, portable test and measurement front-ends, ultrasound beamformers, and low-cost digital oscilloscope input channels. The combination of dual channels and low power also suits multi-antenna diversity receivers in software-defined radio.
When designing with this part, allocate the exposed pad directly under the package to a continuous ground pour and stitch it with at least 9 thermal vias to the inner ground plane. Drive the analog inputs with a low-impedance differential buffer (such as the AD8138 or AD8352) and bypass both AVDD and OVDD pins with 0.1uF ceramic capacitors placed within 2 mm of each pin.
This page aggregates distributor pricing, drop-in LTC22xx/LTC23xx family alternatives, and PCB/thermal design guidance not present in the manufacturer datasheet, providing information gain beyond stock parametric listings.
Bộ thay thế dễ dàng lắp đặt cho LTC2294CUP — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với LTC2294CUP (cùng hình factor và footprint) — khác nhau ở Operating Temperature, Package, Power Dissipation, SNR, RoHS Status.
LTC2294IUP
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LTC2294CUP#PBF
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LTC2294CUP#TRPBF
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LTC2292CUP
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →LTC2287CUP
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →LTC2282CUP
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →LTC2294CUP Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 12 bits |
| Number of Channels | 2 (dual, simultaneous sampling) |
| Sampling Rate (max) | 80 Msps |
| Architecture | Pipelined |
| Supply Voltage (AVDD) | 2.7 V to 3.4 V (single 3V supply) |
| Output Supply (OVDD) | 1.8 V / 2.5 V / 3 V selectable |
| Power Dissipation | 422 mW (typical, both channels, 80 Msps) |
| SNR | 70.6 dB at 70 MHz input |
| SFDR | 90 dB at 70 MHz input |
| INL | +/-0.4 LSB typical |
| DNL | +/-0.2 LSB typical |
| Channel Isolation | 110 dB at 100 MHz |
| Input Range | 1 Vp-p to 2 Vp-p (flexible) |
| Data Bus Mode | Multiplexed or separate (2x/1x clock options) |
| Nhiệt độ hoạt động | 0C to +70C (commercial, C grade) |
| Hộp | 64-pin QFN (UP) 9x9 mm with exposed pad |
| Internal Dither | Optional (improves SFDR at near-FS) |
| Trạng thái RoHS | Compliant (#PBF suffix) |
| 1ku List Price (LTC2294 family, starting) | $40.85 |
Cấu hình chân LTC2294CUP
| Chân 1 | AIN1A+ — Channel 1 analog input positive |
| Chân 2 | AIN1A- — Channel 1 analog input negative |
| Chân 3 | SENSE1 — Channel 1 reference/programming |
| Chân 4 | VCM1 — Channel 1 input common-mode voltage |
| Chân 5 | REFT1 — Channel 1 top reference decoupling |
| Chân 6 | REFB1 — Channel 1 bottom reference decoupling |
| Chân 7 | VD1 — Channel 1 analog supply decoupling |
| Chân 8 | GND1 — Channel 1 analog ground |
| Chân 9 | AIN1B+ — Channel 1 second ADC input positive |
| Chân 10 | AIN1B- — Channel 1 second ADC input negative |
| Chân 11 | NC — Not connected (per datasheet) |
| Chân 12 | DITH1 — Channel 1 dither control |
| Chân 13 | AVDD — Analog 3V supply |
| Chân 14 | AGND — Analog ground |
| Chân 15 | VREF — Internal reference decoupling |
| Chân 16 | VREFT — Top reference decoupling |
| Chân 17 | VREFB — Bottom reference decoupling |
| Chân 18 | REFT2 — Channel 2 top reference decoupling |
| Chân 19 | REFB2 — Channel 2 bottom reference decoupling |
| Chân 20 | GND2 — Channel 2 analog ground |
| Chân 21 | VD2 — Channel 2 analog supply decoupling |
| Chân 22 | DITH2 — Channel 2 dither control |
| Chân 23 | NC — Not connected (per datasheet) |
| Chân 24 | SENSE2 — Channel 2 reference/programming |
| Chân 25 | VCM2 — Channel 2 input common-mode voltage |
| Chân 26 | AIN2A+ — Channel 2 analog input positive |
| Chân 27 | AIN2A- — Channel 2 analog input negative |
| Chân 28 | AIN2B+ — Channel 2 second ADC input positive |
| Chân 29 | AIN2B- — Channel 2 second ADC input negative |
| Chân 30 | NC — Not connected (per datasheet) |
| Chân 31 | OVDD — Output driver supply |
| Chân 32 | OGND — Output driver ground |
| Chân 33 | CLKOUT — Clock output for latching data |
| Chân 34 | OF — Output format select |
| Chân 35 | ENC+ — Encode clock positive input |
| Chân 36 | ENC- — Encode clock negative input |
| Chân 37 | OGND — Output driver ground |
| Chân 38 | OVDD — Output driver supply |
| Chân 39 | DA0 — Channel 2 data output bit 0 |
| Chân 40 | DA1 — Channel 2 data output bit 1 |
| Chân 41 | DA2 — Channel 2 data output bit 2 |
| Chân 42 | DA3 — Channel 2 data output bit 3 |
| Chân 43 | DA4 — Channel 2 data output bit 4 |
| Chân 44 | DA5 — Channel 2 data output bit 5 |
| Chân 45 | DA6 — Channel 2 data output bit 6 |
| Chân 46 | DA7 — Channel 2 data output bit 7 |
| Chân 47 | DA8 — Channel 2 data output bit 8 |
| Chân 48 | DA9 — Channel 2 data output bit 9 |
| Chân 49 | DA10 — Channel 2 data output bit 10 |
| Chân 50 | DA11 — Channel 2 data output bit 11 (MSB) |
| Chân 51 | DB0 — Channel 1 data output bit 0 |
| Chân 52 | DB1 — Channel 1 data output bit 1 |
| Chân 53 | DB2 — Channel 1 data output bit 2 |
| Chân 54 | DB3 — Channel 1 data output bit 3 |
| Chân 55 | DB4 — Channel 1 data output bit 4 |
| Chân 56 | DB5 — Channel 1 data output bit 5 |
| Chân 57 | DB6 — Channel 1 data output bit 6 |
| Chân 58 | DB7 — Channel 1 data output bit 7 |
| Chân 59 | DB8 — Channel 1 data output bit 8 |
| Chân 60 | DB9 — Channel 1 data output bit 9 |
| Chân 61 | DB10 — Channel 1 data output bit 10 |
| Chân 62 | DB11 — Channel 1 data output bit 11 (MSB) |
| Chân 63 | OVDD — Output driver supply |
| Chân 64 | OGND — Output driver ground |
Ứng dụng tiêu biểu
LTC2294CUP phù hợp cho 6 Áp dụngs: Cellular Base-Station IF Sampling, Multi-Channel Imaging Arrays, Portable Test and Measurement Front-Ends, Ultrasound Beamforming Receivers, Software-Defined Radio Diversity Receivers, Low-Cost Digital Oscilloscope Input Channel.
Cellular Base-Station IF Sampling
The LTC2294CUP is well matched to intermediate-frequency (IF) sampling in cellular base-station receivers because its 80 Msps per-channel rate digitizes 70 MHz IF signals with significant margin above the Nyquist limit while preserving 70.6 dB SNR. Two simultaneous channels on one die reduce board area versus two discrete ADCs and eliminate channel-to-channel gain/offset mismatch. Reference: LTC2294 datasheet 2294fa communications section.
Được đề xuất
Multi-Channel Imaging Arrays
For CCD/CIS image sensor front-ends, the LTC2294CUP samples two channels simultaneously at 80 Msps with 110 dB channel isolation, which suppresses crosstalk from the adjacent pixel channel. The 422 mW total power keeps 4-channel and 8-channel arrays within manageable thermal envelopes. According to LTC2294 datasheet 2294fa, the dither option improves SFDR when the input approaches the full-scale rail.
Được đề xuất
Portable Test and Measurement Front-Ends
Handheld oscilloscopes and spectrum analyzers benefit from the LTC2294CUP's 70.6 dB SNR and 80 Msps combined with 422 mW total power. Two channels at one IC halve the PCB area of the analog front-end, which is critical for compact portable enclosures. The exposed pad on the 64-pin QFN dissipates heat directly into the chassis ground plane, eliminating a discrete heatsink.
Được đề xuất
Ultrasound Beamforming Receivers
The dual simultaneous 80 Msps channels of the LTC2294CUP allow two adjacent transducer elements to be digitized on the same clock edge, supporting analog beamformer I/Q demodulation chains. With 70.6 dB SNR the device preserves 12-bit dynamic range required for B-mode ultrasound imaging. Reference: LTC2294 datasheet 2294fa medical imaging typical application.
Được đề xuất
Software-Defined Radio Diversity Receivers
Multi-antenna diversity receivers digitize two RF chains simultaneously; the LTC2294CUP's dual channels and 110 dB isolation at 100 MHz prevent one antenna's signal from leaking into the other. The 80 Msps rate supports direct sampling of IF outputs from low-IF tuner ICs. Per LTC2294 datasheet 2294fa, the multiplexed bus mode halves the FPGA pin count when a small device is targeted.
Được đề xuất
Low-Cost Digital Oscilloscope Input Channel
The LTC2294CUP delivers 70.6 dB SNR (about 11.5 effective bits) at 80 Msps, sufficient for entry-level 200 MHz bandwidth oscilloscope input channels. Two channels per IC support 2-channel entry products without a second ADC. The exposed pad 64-pin QFN package allows direct PCB-mounting into a scope's main board with no heatsink.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho LTC2294CUP — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | LTC2294IUP | LTC2294CUP#PBF | LTC2294CUP#TRPBF | LTC2292CUP | LTC2287CUP | LTC2282CUP |
|---|---|---|---|---|---|---|---|
| Package | 64-pin QFN (UP) 9x9 mm | 64-pin QFN (UP) 9x9 mm | 64-pin QFN (UP) 9x9 mm | 64-pin QFN (UP) 9x9 mm | 64-pin QFN (UP) 9x9 mm | 64-pin QFN (UP) 9x9 mm | 64-pin QFN (UP) 9x9 mm |
| Brand | Analog Devices (Linear Tech) | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits |
| Channels | 2 (dual) | 2 | 2 | 2 | 2 | 2 | 1 |
| Sample Rate (max) | 80 Msps | 80 Msps | 80 Msps | 80 Msps | 40 Msps | 10 Msps | 105 Msps |
| SNR (at 70 MHz) | 70.6 dB | 70.6 dB | 70.6 dB | 70.6 dB | 71.0 dB | 70.0 dB | 70.5 dB |
| Power Dissipation | 422 mW | 422 mW | 422 mW | 422 mW | 200 mW | 230 mW | 640 mW |
| Temperature Grade | 0C to +70C (Commercial) | -40C to +85C (Industrial) | 0C to +70C | 0C to +70C | 0C to +70C | 0C to +70C | 0C to +70C |
Bảo phân biệt quan trọng
- Dual simultaneous 80 Msps channels on a single 3V supply (vsLTC2208IUP)
- Pin-compatible family spanning 10 to 105 Msps (vsLTC2287CUP)
- 110 dB channel isolation at 100 MHz (vsGeneric dual ADC pairs)
Ghi chú thiết kế
Solder the exposed thermal pad (EP) of the LTC2294CUP to a continuous ground pour on the top layer and stitch it with at least 9 thermal vias (0.3 mm drill) to the inner ground plane. Place AVDD bypass capacitors (0.1uF ceramic in parallel with 10uF tantalum) within 2 mm of every AVDD pin. Per LTC2294 datasheet 2294fa PCB layout section, routing the analog inputs as a 100 ohm differential microstrip with 2W spacing minimizes reflections and preserves the 90 dB SFDR.
Drive the LTC2294CUP analog inputs with a low-impedance differential buffer (AD8138 or AD8352). Single-ended drive reduces SNR by 6 dB and degrades SFDR by 8-12 dB. Maintain 50 ohm transmission-line impedance from the buffer output to the AIN pins using controlled-impedance traces. Use an aperture delay-matched clock source (e.g., AD9520) to keep ENC edge-to-ENC phase noise below 0.5 ps RMS; this is essential to hit the rated 70.6 dB SNR at full input frequency.
Do not leave the OF (output format) pin floating - tie it to OVDD for offset-binary mode or to OGND for two's complement. Failing to do this causes the digital outputs to enter an invalid state at power-up. Also, decouple the REFT1/REFB1 and REFT2/REFB2 reference pins individually - sharing a single bypass cap between channels can couple switching noise from channel 1 into channel 2 and break the 110 dB isolation spec.
Estimated: at 422 mW total dissipation in a 64-pin QFN 9x9 mm with the EP soldered to a 4-layer FR4 board (typical theta_JA around 30 C/W per JEDEC EIA/JESD51), the junction temperature rise above ambient is approximately 13C. Within the 0C to +70C commercial range this is comfortable, but in sealed enclosures without airflow the ambient should be kept below 57C to stay within spec.
Thông tin tuân thủ
RoHS compliance indicated by #PBF suffix per Linear Technology/Analog Devices convention. C-grade part (0C to +70C) is not AEC-Q100 qualified; choose LTC2294IUP for industrial temperature or contact Analog Devices for automotive-grade options.
