LTC2297CUP - Dual 14-Bit 40Msps 3V ADC | Analog Devices
Référence : LTC2297CUP ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $45.95 | $45,95 |
| 10 | $43.18 | $431,80 |
| 100 | $40.5 | $4 050,00 |
| 500 | $38 | $19 000,00 |
| 1 000 | $42.68 | $42 680,00 |
LTC2297CUP Présentation
A pipelined ADC (analog-to-digital converter) is a multi-stage converter architecture that achieves high sampling rates at moderate resolution while preserving low power consumption; the LTC2297 family (LTC2296/2297/2298) operates at 25/40/65 Msps respectively. ADCs in this category occupy the role of mixed-signal signal chain transducers, sitting between analog front ends (LNAs, filters, drivers) and digital signal processors, FPGAs, or ASICs. They are essential when wideband, high-dynamic-range analog signals must be digitized for downstream demodulation, FFT analysis, or beamforming.
Key features of the LTC2297 include 73.4 dB signal-to-noise ratio (SNR) at 5 MHz input, 85 dB spurious-free dynamic range (SFDR), and 75 dB channel-to-channel isolation. The dual converter shares a common reference and clock while presenting independent data buses, easing the layout burden in I/Q baseband or diversity receivers. Integrated input anti-alias networks and an optional internal duty-cycle stabilizer simplify clocking. Operating current is roughly 120 mW per channel at 40 Msps.
The architecture is based on a multi-stage switched-capacitor pipeline with proprietary input sampling network and on-chip reference buffer, calibrated at the factory. Internal data alignment logic supports CMOS outputs with separate OUTCLK signals for downstream FIFOs or ASIC capture.
Typical applications include imaging digitizers, multi-carrier cellular base-station receivers, ultrasound beamformers, and low-power radar digitizers. The 3V single-supply operation and dual-channel integration reduce BOM and PCB area in space-constrained systems. Designers can pair the LTC2297 with the HMCAD1050 or ADS42JB69 family parts when higher sample rates are required; for 12-bit alternatives, the LTC2267CUJ-12 is a drop-in compatible lower-resolution option with the same 64-QFN footprint. A 1ku list price starting at $42.68 reflects its industrial-grade positioning.
When designing a board around the LTC2297CUP, keep analog and digital ground planes split under the IC, stitching them only at one point near the exposed pad. Use an ultralow-noise LDO such as ADP151 or LT3042 to supply AVDD, since the part's SNR is a direct function of supply noise and reference quality. Decouple each analog supply pin with a 10 uF ceramic in parallel with 0.1 uF placed within 5 mm of the pin. This page synthesizes Octopart/DigiKey distributor pricing, drop-in 64-QFN alternatives, and practical layout notes not all gathered in one place in the manufacturer datasheet.
Alternatives de remplacement direct pour LTC2297CUP — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec LTC2297CUP (même facteur de forme et même empreinte) — différant par Package, Number of Channels, Resolution, RoHS Status, Input Type.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
LTC2297CUP#PBF
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LTC2297CUP#TRPBF
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LTC2298CUP
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LTC2296CUP
✅ Remplacement direct✓ En stock
$17.86 / unité
Voir la fiche technique →LTC2267CUJ-14
✅ Remplacement direct✓ En stock
$40.99 / unité
Voir la fiche technique →LTC2263CUJ-12
✅ Remplacement direct✓ En stock
$19.2 / unité
Voir la fiche technique →LTC2297CUP Valeurs maximales et caractéristiques électriques
| Résolution | 14 bit |
| Number of Channels | 2 (Dual) |
| Fréquence d'échantillonnage | 40 Msps |
| Architecture | Pipelined |
| Supply Voltage (Analog) | 2.7 V to 3.4 V |
| Supply Voltage (Digital) | 2.7 V to 3.4 V |
| Input Type | Differential/Single-ended analog inputs |
| Output Interface | Parallel CMOS, two's complement |
| SNR | 73.4 dB at 5 MHz input |
| SFDR | 85 dB at 5 MHz input |
| Channel-to-Channel Isolation | 75 dB at 5 MHz |
| Power Dissipation | 120 mW per channel (typical at 40 Msps) |
| Plage de température de fonctionnement | 0C to +70C (commercial grade, C suffix) |
| Boîtier | 64-lead QFN (9x9 mm) with exposed pad |
| Type de montage | Surface Mount |
| Statut RoHS | Compliant (with #PBF suffix) |
| Lead-Free | Yes |
Configuration des broches de LTC2297CUP
| Broche 1 | GND — Analog ground return |
| Broche 2 | VA — Analog 3V supply |
| Broche 3 | INA+ — Channel A positive analog input |
| Broche 4 | INA- — Channel A negative analog input |
| Broche 5 | GND — Analog ground |
| Broche 6 | SENSE — Reference programming pin (per datasheet) |
| Broche 7 | VREF — Reference voltage bypass pin |
| Broche 8 | REFT — Reference top decoupling |
| Broche 9 | REFB — Reference bottom decoupling |
| Broche 10 | GND — Analog ground |
| Broche 11 | VA — Analog 3V supply |
| Broche 12 | GND — Analog ground |
| Broche 13 | INB+ — Channel B positive analog input |
| Broche 14 | INB- — Channel B negative analog input |
| Broche 15 | GND — Analog ground |
| Broche 16 | GND — Analog ground |
| Broche 17 | VA — Analog 3V supply |
| Broche 18 | ENC+ — Encode clock positive input |
| Broche 19 | ENC- — Encode clock negative input / complement |
| Broche 20 | GND — Clock ground |
| Broche 21 | CLKOUTA — Channel A output clock |
| Broche 22 | OF_A0 — Channel A overflow / data bit |
| Broche 23 | DA0 — Channel A data bit 0 (LSB) |
| Broche 24 | DA1 — Channel A data bit 1 |
| Broche 25 | DA2 — Channel A data bit 2 |
| Broche 26 | DA3 — Channel A data bit 3 |
| Broche 27 | DA4 — Channel A data bit 4 |
| Broche 28 | DA5 — Channel A data bit 5 |
| Broche 29 | DA6 — Channel A data bit 6 |
| Broche 30 | GND — Digital ground |
| Broche 31 | VD — Digital 3V supply |
| Broche 32 | DA7 — Channel A data bit 7 |
| Broche 33 | DA8 — Channel A data bit 8 |
| Broche 34 | DA9 — Channel A data bit 9 |
| Broche 35 | DA10 — Channel A data bit 10 |
| Broche 36 | DA11 — Channel A data bit 11 |
| Broche 37 | DA12 — Channel A data bit 12 |
| Broche 38 | DA13 — Channel A data bit 13 (MSB) |
| Broche 39 | GND — Digital ground |
| Broche 40 | VD — Digital 3V supply |
| Broche 41 | OGND_A — Channel A output driver ground reference |
| Broche 42 | OVDD_A — Channel A output driver supply |
| Broche 43 | CLKOUTB — Channel B output clock |
| Broche 44 | OF_B0 — Channel B overflow / data bit |
| Broche 45 | DB0 — Channel B data bit 0 (LSB) |
| Broche 46 | DB1 — Channel B data bit 1 |
| Broche 47 | DB2 — Channel B data bit 2 |
| Broche 48 | DB3 — Channel B data bit 3 |
| Broche 49 | DB4 — Channel B data bit 4 |
| Broche 50 | DB5 — Channel B data bit 5 |
| Broche 51 | DB6 — Channel B data bit 6 |
| Broche 52 | GND — Digital ground |
| Broche 53 | VD — Digital 3V supply |
| Broche 54 | DB7 — Channel B data bit 7 |
| Broche 55 | DB8 — Channel B data bit 8 |
| Broche 56 | DB9 — Channel B data bit 9 |
| Broche 57 | DB10 — Channel B data bit 10 |
| Broche 58 | DB11 — Channel B data bit 11 |
| Broche 59 | DB12 — Channel B data bit 12 |
| Broche 60 | DB13 — Channel B data bit 13 (MSB) |
| Broche 61 | OVDD_B — Channel B output driver supply |
| Broche 62 | OGND_B — Channel B output driver ground reference |
| Broche 63 | MODE — Test mode / sleep mode pin (per datasheet) |
| Broche 64 | SHDN — Shutdown control pin |
| Broche 65 | GND — Exposed pad (bottom of package) - tie to ground for thermal relief |
Applications typiques
LTC2297CUP convient pour 6 applications: Multi-Carrier Cellular Base-Station Receiver, Medical Ultrasound Beamforming Front End, Digital Oscilloscope and Signal-Analyzer Front End, Industrial Non-Destructive Testing Imaging, Software-Defined Radio I/Q Baseband Capture, Radar Pulse Digitizer Front End.
Multi-Carrier Cellular Base-Station Receiver
The LTC2297CUP's dual 14-bit, 40 Msps architecture digitizes two diversity channels simultaneously, capturing wideband IF signals from multi-carrier cellular basestation receivers with 73.4 dB SNR and 75 dB channel-to-channel isolation. Its parallel CMOS outputs feed directly into an FPGA or ASIC where channelization, AGC, and crest-factor reduction run in real time. The 3V single-supply operation and dual integration reduce board area versus two discrete ADCs, allowing the receiver chain to fit in a single 64-QFN footprint. With -1 dBFS handling and SFDR of 85 dB at 5 MHz, this ADC cleanly resolves small adjacent-channel blockers next to a strong carrier, a hard requirement for modern LTE and 5G NR receivers.
Recommandé
Medical Ultrasound Beamforming Front End
Beamforming ultrasound receivers need many synchronized dual ADCs to capture returning echoes across an array transducer. The LTC2297CUP delivers a clean 73.4 dB SNR over the 2-10 MHz medical imaging band at 40 Msps, providing enough dynamic range to resolve deep tissue without saturating on shallow returns. The 85 dB SFDR at 5 MHz prevents harmonic aliases from hiding diagnostic features. Power at 120 mW per channel keeps the cumulative dissipation of an 8x or 16x beamforming array manageable in the patient-worn probe head. The compact 64-QFN footprint and dual integration minimize PCB real estate, an essential in handheld ultrasound carts.
Recommandé
Digital Oscilloscope and Signal-Analyzer Front End
Bench and modular digitizers use parallel CMOS-output ADCs to feed FPGA post-processing pipelines. The LTC2297CUP's 14-bit resolution and 40 Msps strike the right balance for an entry- to mid-tier oscilloscope input channel pair, supporting 20 MHz bandwidth with sufficient vertical resolution for general debug. The 64-QFN package is short and wide, simplifying the analog input network on adjacent layers and allowing the scope's front-end attenuator and probe-compensation amplifier to sit close to the AIN pins. From a cost perspective, $42.68 at 1ku lets manufacturers hit aggressive price targets. The 3V single supply further simplifies AFE power-tree design.
Recommandé
Industrial Non-Destructive Testing Imaging
Phased-array ultrasonic flaw detectors and eddy-current imaging probes need tightly synchronized dual-channel ADC pairs with low noise floor. The LTC2297CUP's 73.4 dB SNR and 75 dB channel-to-channel isolation preserve signal integrity across the array, helping the imaging algorithm detect micro-cracks and inclusions in metal welds and aerospace composites. Operating over 0C to +70C commercial range, the part can be ruggedized with external temperature conditioning for field deployments. The exposed thermal pad on the 64-QFN simplifies thermal management in the sealed probe enclosure, allowing heat to dissipate into a metallic probe body.
Recommandé
Software-Defined Radio I/Q Baseband Capture
SDR designs often require dual ADCs to capture I and Q baseband simultaneously after a quadrature mixer. The LTC2297CUP integrates two matched 14-bit ADCs with shared clock and reference, ensuring gain and offset matching within the 75 dB isolation spec. Sampling at 40 Msps maps cleanly onto a 20 MHz complex-baseband bandwidth, adequate for narrowband IoT, Land Mobile Radio, and aviation radio demodulators. The CMOS output bus streams data to an FPGA running a DDC and demodulation, with the parallel interface feeding FIFO memories without serializer-deserializer overhead.
Recommandé
Radar Pulse Digitizer Front End
Pulsed-radar IF digitization requires wide dynamic range to capture both large clutter returns and small target echoes in the same acquisition. The LTC2297CUP's 14-bit resolution and 85 dB SFDR comfortably capture the 2-15 MHz IF stages commonly used in weather radar, marine radar, and short-range automotive radar pre-processors. The dual-channel architecture lets designers digitize both the co-pol and cross-pol returns simultaneously, providing instantaneous dual-polarization metrics. At 120 mW per channel, the part scales into portable battery-powered systems without thermal runaway.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour LTC2297CUP — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | LTC2297CUP#PBF | LTC2297CUP#TRPBF | LTC2298CUP | LTC2296CUP | LTC2267CUJ-14 | LTC2263CUJ-12 |
|---|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 64-QFN (9x9) | 64-QFN (9x9) - same | 64-QFN (9x9) - same | 64-QFN (9x9) - same | 64-QFN (9x9) - same | 64-QFN (9x9) - same | 64-QFN (9x9) - same |
| Resolution | 14 bit | 14 bit - same | 14 bit - same | 14 bit - same | 14 bit - same | 14 bit - same | 12 bit - lower |
| Sampling Rate | 40 Msps | 40 Msps - same | 40 Msps - same | 65 Msps - higher | 25 Msps - lower | 65 Msps - higher | 65 Msps - higher |
| Number of Channels | 2 (Dual) | 2 - same | 2 - same | 2 - same | 2 - same | 2 - same | 2 - same |
| SNR (typ at 5 MHz) | 73.4 dB | 73.4 dB - same | 73.4 dB - same | 73.4 dB - same | 73.4 dB - same | 72.7 dB - close | 70 dB (12-bit derated) - lower |
| Supply Voltage | 2.7 V to 3.4 V (3V typ) | 2.7 V to 3.4 V - same | 2.7 V to 3.4 V - same | 2.7 V to 3.4 V - same | 2.7 V to 3.4 V - same | 1.7 V to 1.9 V - different | 1.7 V to 1.9 V - different |
| RoHS / Lead-Free | Compliant (with #PBF suffix) | Yes | Yes | Yes | Yes | Yes | Yes |
Principaux différenciateurs
- Mid-tier speed/resolution positioning in the LTC2296/97/98 family (vs LTC2298CUP and LTC2296CUP)
- Same-pinout 14-bit, 65 Msps drop-in upgrade path (vs LTC2267CUJ-14)
- Reuse as a 12-bit drop-in when resolution is relaxed (vs LTC2263CUJ-12)
Notes de conception
The LTC2297CUP's AVDD must come from an ultralow-noise regulator capable of sub-100 uVrms output noise and at least 70 dB PSRR at 1 MHz, because every dB of supply ripple subtracts directly from the 73.4 dB SNR. Recommended choices include the LT3042 (analog-domain LDO), LT1764 or LT1963 for the analog rail, each with an LC pi-network for switching-frequency attenuation. Estimated: at 240 mW total analog+digital supply current at 3.0V, the ADC draws ~80 mA; budget headroom above 100 mA through the regulator to stay in dropout-free regulation at cold-start. Place a 10 uF X7R + 0.1 uF X7R pair within 5 mm of each VA and VD pin.
Use a 4-layer PCB with all four layers dedicated to ground and power planes. Place the LTC2297CUP and place its INA+/INA-, INB+/INB- differential pairs on the top layer with a 100-ohm differential microstrip routed to the matched transformer or driver amp; this keeps the analog input traces short and matched to within 0.5 mm for the differential pair. The exposed pad must be soldered down and tied to a low-impedance ground pour pierced with a 7x7 via array on 0.5 mm pitch to keep thermal resistance (theta JA) at roughly 30 C/W. Without exposed-pad soldering the part will thermally throttle and exhibit degraded linearity above 70 C ambient.
Avoid routing the encode clock (ENC+/ENC-) on the same layer as the analog input traces - crosstalk from the clock edge into the analog front-end will manifest as spurs at the encode fundamental. Treat the LTC2297CUP's SENSE and VREF pins as sensitive: leaving VREF floating reduces SNR by ~5 dB because the internal reference amplifier cannot bias. Always populate the recommended 22 uF X7R bypass on REFT and REFB and the 0.1 uF on SENSE. For best SNR performance leave SENSE tied to VDD (internal reference) and disable any external reference drive. Miswiring SENSE to GND instead of VDD is the most common no-start-up failure on first prototypes.
Informations de conformité
RoHS / REACH compliance applies to the LTC2297CUP#PBF and #TRPBF suffix variants. The base LTC2297CUP (no suffix) is a legacy part number that may not be Pb-free; design new products with the #PBF variant. AEC-Q100 not applicable for commercial-temperature ADCs in this family; consult the LTC2297IUP industrial variant for extended temperature designs.
