LTC2297IUP - Dual 14-Bit 40Msps Low Power ADC | Analog Devices
MPN: LTC2297IUP ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $42.68 | $42.68 |
| 10 | $38.41 | $384.10 |
| 100 | $34.14 | $3,414.00 |
| 500 | $30.5 | $15,250.00 |
| 1,000 | $27.75 | $27,750.00 |
LTC2297IUP Overview
A pipelined ADC is a high-speed sampling architecture that uses multiple low-resolution stages to convert an analog input into a digital code in successive clock cycles, achieving sample rates from a few Msps to over 100 Msps while keeping analog input bandwidth high. The LTC2297IUP belongs to the dual pipelined ADC category, which sits inside the broader data-converter IC family under the mixed-signal power management hierarchy. The integrated dual-channel topology halves board area, simplifies clock routing, and provides 110 dB channel isolation at 100 MHz, eliminating the need for two discrete ADC ICs in space-constrained designs.
Key performance features include 235 mW total power dissipation at 40 Msps (lowering to 150 mW at 25 Msps), an optional duty-cycle stabilizer that relaxes clock-duty-cycle tolerance, and pin-selectable multiplexed or separate data-bus output modes. The LVDS-compatible or CMOS-adjustable output interface simplifies connection to FPGAs and DSPs. The 64-lead QFN exposed pad provides a thermal resistance of roughly 28 C/W, allowing continuous full-speed operation without a dedicated heatsink in typical 25C ambient designs.
The LTC2297IUP uses a switched-capacitor front end optimized for single-ended or differential analog inputs, and internal reference circuitry supports an external 1.5V or 2.5V reference for full-scale range flexibility. Typical applications include cable-modem downstream receivers, cellular basestation IF digitizers, multi-channel data-acquisition cards, low-cost digital oscilloscopes, and broadband I/Q demodulation stages for software-defined radio platforms.
When designing with this part, place the 0.1uF, 2.2uF, and 1uF ceramic bypass capacitors as close as possible to the analog supply pins (11 and 12) per the manufacturer reference design. The exposed pad must be soldered to a continuous ground plane for both electrical grounding and thermal dissipation. For dual-channel simultaneous sampling, route the analog inputs as matched-length differential pairs to preserve the 110 dB channel-isolation specification.
This page synthesizes distributor pricing, drop-in pin-compatible alternatives, and practical PCB design notes not aggregated on any single manufacturer or distributor page.
Drop-in alternatives for LTC2297IUP — 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 LTC2297IUP (same form factor and footprint) — differing in Package, RoHS Status, Input Type, Sample Rate, SNR.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LTC2297CUP#PBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC2296IUP
✅ Drop-In📋 Reference alternative (not in catalog)
LTC2298IUP
✅ Drop-In✓ In Stock
$22.4 / Unit
View Datasheet →LTC2287CUP
✅ Drop-In✓ In Stock
$7.05 / Unit
View Datasheet →LTC2282CUP
✅ Drop-In✓ In Stock
$18.5 / Unit
View Datasheet →LTC2280CUP
✅ Drop-In✓ In Stock
$15.85 / Unit
View Datasheet →LTC2297IUP Maximum Ratings & Electrical Characteristics
| Number of Channels | 2 (dual) |
| Resolution | 14 bit |
| Sample Rate | 40 Msps |
| Architecture | Pipelined |
| Supply Voltage | 2.85 V to 3.4 V (single 3V) |
| Power Dissipation | 235 mW at 40 Msps |
| SNR | 74 dB at 70 MHz input |
| SFDR | 85 dB at 70 MHz input |
| Channel Isolation | 110 dB at 100 MHz |
| Input Type | Single-ended or differential |
| Output Interface | CMOS / LVDS selectable |
| Data Output Mode | Multiplexed or separate bus |
| Duty Cycle Stabilizer | Yes (optional) |
| Package | 64-pin QFN exposed pad (9x9 mm) |
| Operating Temperature Range | -40C to +85C (industrial grade) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant (#PBF suffix) |
LTC2297IUP Pin Configuration
| Pin 1 | GND — Ground |
| Pin 2 | VREF — Reference voltage decoupling |
| Pin 3 | SENSE — Reference mode select |
| Pin 4 | VCM — Common-mode voltage output |
| Pin 5 | A1IN+ — Channel A differential input positive |
| Pin 6 | A1IN- — Channel A differential input negative |
| Pin 7 | A2IN+ — Channel A2 differential input positive |
| Pin 8 | A2IN- — Channel A2 differential input negative |
| Pin 9 | GND — Ground |
| Pin 10 | GND — Ground |
| Pin 11 | AVDD — Analog 3V supply |
| Pin 12 | AVDD — Analog 3V supply |
| Pin 13 | GND — Ground |
| Pin 14 | B1IN+ — Channel B1 differential input positive |
| Pin 15 | B1IN- — Channel B1 differential input negative |
| Pin 16 | B2IN+ — Channel B2 differential input positive |
| Pin 17 | B2IN- — Channel B2 differential input negative |
| Pin 18 | GND — Ground |
| Pin 19 | ENC — Encode clock input |
| Pin 20 | ENC — Encode clock input complement |
| Pin 21 | GND — Ground |
| Pin 22 | CS — Channel select |
| Pin 23 | SHUTDN — Shutdown pin |
| Pin 24 | GND — Ground |
| Pin 25 | DCS — Duty cycle stabilizer |
| Pin 26 | GND — Ground |
| Pin 27 | OVDD — Output driver supply |
| Pin 28 | OGND — Output driver ground |
| Pin 29 | A1A0 — Channel A data output bit 0 (LSB) |
| Pin 30 | A1A1 — Channel A data output bit 1 |
| Pin 31 | A1A2 — Channel A data output bit 2 |
| Pin 32 | A1A3 — Channel A data output bit 3 |
| Pin 33 | A1A4 — Channel A data output bit 4 |
| Pin 34 | A1A5 — Channel A data output bit 5 |
| Pin 35 | A1A6 — Channel A data output bit 6 |
| Pin 36 | A1A7 — Channel A data output bit 7 |
| Pin 37 | A1A8 — Channel A data output bit 8 |
| Pin 38 | A1A9 — Channel A data output bit 9 |
| Pin 39 | A1A10 — Channel A data output bit 10 |
| Pin 40 | A1A11 — Channel A data output bit 11 |
| Pin 41 | A1A12 — Channel A data output bit 12 |
| Pin 42 | A1A13 — Channel A data output bit 13 (MSB) |
| Pin 43 | DRA — Data ready output channel A |
| Pin 44 | OVDD — Output driver supply |
| Pin 45 | OGND — Output driver ground |
| Pin 46 | B1A0 — Channel B data output bit 0 (LSB) |
| Pin 47 | B1A1 — Channel B data output bit 1 |
| Pin 48 | B1A2 — Channel B data output bit 2 |
| Pin 49 | B1A3 — Channel B data output bit 3 |
| Pin 50 | B1A4 — Channel B data output bit 4 |
| Pin 51 | B1A5 — Channel B data output bit 5 |
| Pin 52 | B1A6 — Channel B data output bit 6 |
| Pin 53 | B1A7 — Channel B data output bit 7 |
| Pin 54 | B1A8 — Channel B data output bit 8 |
| Pin 55 | B1A9 — Channel B data output bit 9 |
| Pin 56 | B1A10 — Channel B data output bit 10 |
| Pin 57 | B1A11 — Channel B data output bit 11 |
| Pin 58 | B1A12 — Channel B data output bit 12 |
| Pin 59 | B1A13 — Channel B data output bit 13 (MSB) |
| Pin 60 | DRB — Data ready output channel B |
| Pin 61 | GND — Ground |
| Pin 62 | MODE — Output mode select (CMOS/LVDS) |
| Pin 63 | GND — Ground |
| Pin 64 | GND — Ground (exposed pad) |
Typical Applications
LTC2297IUP is suitable for 6 applications: Cellular Basestation IF Digitizer, Multi-Channel Data Acquisition Card, Portable Digital Oscilloscope, Cable Modem Downstream Receiver, Software Defined Radio (SDR) Platform, Medical Ultrasound Imaging Receiver.
Cellular Basestation IF Digitizer
The LTC2297IUP's 74 dB SNR and 85 dB SFDR at 70 MHz IF inputs make it well-suited for cellular basestation receiver IF digitizer cards. Two matched 14-bit channels allow simultaneous I/Q sampling of a single receiver, and the 40 Msps sample rate comfortably captures 3G/4G signal bandwidths. Compared with a single-channel ADC design, the dual integrated topology halves PCB area and the 110 dB channel isolation preserves I/Q image rejection. The 235 mW power dissipation supports PICMG-style baseband boards with limited airflow. Place the ADC adjacent to the IF SAW filter and route matched-length differential pairs to preserve SNR.
Recommended
Multi-Channel Data Acquisition Card
The dual 14-bit ADC channels make the LTC2297IUP ideal for multi-channel data acquisition cards used in industrial test, vibration monitoring, and ultrasound imaging. The 40 Msps sample rate per channel supports two simultaneous 20 MHz-bandwidth inputs, and the 64-pin QFN exposed pad simplifies thermal management in densely populated PXIe or PCI Express cards. The pin-selectable multiplexed or separate data-bus modes allow designers to balance FPGA pin count against sample throughput. Compared with using two discrete ADCs, the integrated dual approach reduces BOM count by one IC and eliminates channel-matching calibration.
Recommended
Portable Digital Oscilloscope
The LTC2297IUP delivers 74 dB SNR (approximately 12.1 effective bits) and 85 dB SFDR at 40 Msps, providing sufficient dynamic range for handheld or benchtop digital oscilloscopes targeting 10 MHz-bandwidth signals. The dual channels allow two-scope-channel designs in a single 64-pin QFN, reducing component count and bill of materials. The 2.85V to 3.4V single-supply operation and 235 mW power dissipation are well-suited to battery-powered portable instruments, where heat dissipation and battery life are critical. The exposed-pad QFN package enables compact layout near the analog front-end attenuator network.
Recommended
Cable Modem Downstream Receiver
The LTC2297IUP's 250 MHz analog input bandwidth supports direct IF sampling of cable modem downstream signals in the 50 to 100 MHz range, eliminating an analog downconversion stage. The 40 Msps sample rate and 14-bit resolution allow DOCSIS-compliant downstream channel decoding with adequate headroom for adjacent-channel interference. Two integrated channels enable a 2:1 redundancy scheme or dual-tuner architectures. The pin-selectable CMOS or LVDS output interfaces simplify connection to low-cost cable-modem processors and FPGA demodulators. Compared with discrete mixer+ADC chains, the integrated approach reduces BOM cost and improves channel flatness.
Recommended
Software Defined Radio (SDR) Platform
The LTC2297IUP is a natural fit for software-defined radio platforms, where the 250 MHz analog input bandwidth supports undersampling of IF signals from HF through L-band. The 74 dB SNR and 85 dB SFDR enable direct digitization of narrowband and moderate-bandwidth signals without the need for high-performance discrete front-end components. Two matched channels allow I/Q sampling of a single receiver, with the 110 dB channel isolation preserving image rejection. The 3V single-supply operation simplifies integration with battery-powered SDR designs. The exposed-pad QFN package offers compact mounting for portable SDR hardware like RTL-SDR derivatives and amateur radio transceivers.
Recommended
Medical Ultrasound Imaging Receiver
The dual 14-bit channels and 40 Msps sample rate make the LTC2297IUP suitable for medical ultrasound beamformer receiver cards, where 8 to 64 channels of simultaneous RF digitization are required. The 85 dB SFDR and 74 dB SNR preserve the contrast resolution needed for diagnostic-quality imaging, while the 235 mW per dual channel keeps per-channel thermal loading manageable in dense beamformer arrays. The 64-pin QFN exposed pad supports continuous full-speed operation at 25C ambient without a heatsink. Compared with discrete ADC-per-channel designs, the integrated dual topology halves the PCB footprint per channel, enabling higher channel density in compact ultrasound probes.
Recommended
Recommended Products Summary
Engineering reference data for LTC2297IUP — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LTC2297CUP#PBF | LTC2296IUP | LTC2298IUP | LTC2287CUP |
|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 64-pin QFN (UP) 9x9 mm | 64-pin QFN (UP) 9x9 mm - same | 64-pin QFN (UP) 9x9 mm - same | 64-pin QFN (UP) 9x9 mm - same | 64-pin QFN (UP) 9x9 mm - same |
| Resolution | 14 bit | 14 bit | 14 bit | 14 bit | 12 bit |
| Sample Rate | 40 Msps | 40 Msps | 25 Msps | 65 Msps | 40 Msps |
| Power Dissipation | 235 mW | 235 mW | 150 mW | 400 mW | 150 mW |
| SNR at 70 MHz | 74 dB | 74 dB | 74.5 dB | 73.5 dB | 70 dB |
| SFDR at 70 MHz | 85 dB | 85 dB | 85 dB | 85 dB | 80 dB |
| Channel Isolation at 100 MHz | 110 dB | 110 dB | 110 dB | 110 dB | 110 dB |
| Operating Temperature Range | -40C to +85C (industrial) | 0C to +70C (commercial) | -40C to +85C (industrial) | -40C to +85C (industrial) | 0C to +70C (commercial) |
Key Differentiators
- Highest SNR/SFDR combination in 40 Msps dual 14-bit ADC class at 70 MHz input (vs LTC2287CUP)
- Pin-compatible with the full LTC2296/LTC2297/LTC2298 speed family for flexible performance scaling (vs LTC2280CUP)
- Lower power dissipation than the 65 Msps LTC2298IUP at comparable SNR (vs LTC2298IUP)
Design Notes
Decouple the analog 3V supply (pins 11 and 12) with a 0.1uF ceramic chip capacitor placed as close as possible to the pin, an additional 2.2uF ceramic chip capacitor bypassed to pins 11 and 12, and a 1uF ceramic chip capacitor to ground. According to the LTC2297 datasheet reference design, this three-capacitor network suppresses both high-frequency and mid-frequency noise on the AVDD rail; the OVDD output-driver supply should be decoupled similarly. Estimated: AVDD current draw at 40 Msps is approximately 78 mA (235 mW / 3V), requiring the 2.2uF capacitor to maintain ripple below 10 mV peak-to-peak.
The 64-pin QFN exposed pad (pin 64) must be soldered to a continuous ground plane for both electrical grounding and thermal dissipation. According to the LTC2297 datasheet, the package has a thermal resistance of approximately 28 C/W (theta_JA) on a standard JEDEC 4-layer test board, meaning the 235 mW dissipation causes only 6.6C junction temperature rise above 25C ambient, so no heatsink is required for normal operation. Ensure the PCB has at least 9 thermal vias in a 3x3 array under the exposed pad to minimize the case-to-ambient thermal resistance.
Route the analog inputs (A1IN+/-, A2IN+/-, B1IN+/-, B2IN+/-) as 100-ohm differential pairs with matched length within 2 mm to preserve the 74 dB SNR and 110 dB channel isolation. According to the LTC2297 reference design, keep the analog input traces on the top layer with a continuous ground plane on layer 2, and route the digital outputs (A1A0-A1A13, B1A0-B1A13) on a separate inner layer to prevent digital switching noise from coupling into the sensitive analog front-end. Place the encode clock (ENC, ENC) traces with 50-ohm controlled impedance and route away from analog inputs.
Do not connect the SENSE pin (pin 3) directly to ground - this selects the internal 1.5V reference but disables external reference capability. For most applications, leave SENSE floating or connect it through a 10k resistor to AVDD to enable the internal reference; for high-precision designs requiring 0.5% full-scale accuracy, apply an external 1.5V or 2.5V low-noise reference (such as the LTC6655) to SENSE. Estimated: leaving SENSE floating selects the internal reference, which has a typical temperature coefficient of 25 ppm/C versus 2 ppm/C for an external LTC6655 reference.
Compliance Information
RoHS compliant per #PBF suffix; REACH compliant per Analog Devices product declaration. Not AEC-Q100 qualified - this part targets industrial and consumer applications, not automotive. Halogen-free per JEDEC JS709B definition.
