LTC2143CUP-14 - 14-Bit 80Msps Dual ADC | Analog Devices
MPN: LTC2143CUP-14 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $56.94 | $56.94 |
| 10 | $51.25 | $512.50 |
| 100 | $45.55 | $4,555.00 |
| 500 | $41.2 | $20,600.00 |
| 1,000 | $36.95 | $36,950.00 |
LTC2143CUP-14 Overview
An ADC (analog-to-digital converter) is a mixed-signal integrated circuit that samples a continuous-time analog voltage and produces a discrete digital code representing its amplitude. Pipelined ADCs achieve a favorable trade-off between sample rate (tens to hundreds of MSPS) and resolution (10-16 bits) by cascading multiple low-resolution stages with inter-stage residue amplification; they are the dominant architecture in communications, imaging, and test-and-measurement front ends. Dual-channel pipelined ADCs such as the LTC2143CUP-14 simultaneously quantize two analog inputs so downstream DSP can recover quadrature relationships, multi-antenna phase, or multi-sensor time correlation.
Key specifications include ±1 LSB typical INL, ±0.3 LSB typical DNL with no missing codes over the full temperature range, 1.2 LSB RMS transition noise, and flexible digital outputs supporting full-rate CMOS, double-data-rate CMOS, or double-data-rate LVDS. A separate output supply pin lets the CMOS swing range from 1.8 V to 3.3 V independent of the analog 1.8 V core rail, simplifying interface to FPGAs and ASICs on different I/O voltage domains.
Typical applications include cellular base-station receivers, software-defined radio (SDR) front ends, multi-channel data acquisition cards, medical ultrasound beamformers, and portable battery-powered instrumentation. The 64-QFN (9x9) exposed pad keeps the package compact while providing a low thermal-resistance path that is essential for the multilayer board ground-plane layout recommended by the manufacturer datasheet. A clean unbroken ground plane in the layer immediately beneath the ADC is required to achieve the published SNR/SFDR performance.
A primary design consideration is bypassing the analog and digital rails with low-ESR ceramic capacitors placed within 2 mm of each supply pin and tying the exposed pad to a solid ground pour with at least 16 thermal vias. The internal reference can be disabled in favor of an external reference when tighter gain error or channel matching is required across multiple ADCs.
Drop-in alternatives for LTC2143CUP-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 LTC2143CUP-14 (same form factor and footprint) — differing in Input Type, Package, RoHS Status, Architecture, Number of Channels.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LTC2144CUP-14
✅ Drop-In✓ In Stock
$38.95 / Unit
View Datasheet →LTC2145CUP-14
✅ Drop-In📋 Reference alternative (not in catalog)
LTC2142IUP-14
✅ Drop-In✓ In Stock
$34.71 / Unit
View Datasheet →LTC2174IUKG-14
✅ Drop-In✓ In Stock
$119.96 / Unit
View Datasheet →LTC2180IUP
✅ Drop-In✓ In Stock
$48 / Unit
View Datasheet →ISLA214P25IRZ
✅ Drop-In✓ In Stock
$24.9 / Unit
View Datasheet →LTC2143CUP-14 Maximum Ratings & Electrical Characteristics
| Resolution | 14 bit |
| Number of Channels | 2 (dual, simultaneous sampling) |
| Sample Rate | 80 MSPS |
| Architecture | Pipelined |
| Input Type | Differential, Single-Ended |
| Data Interface | Parallel CMOS / DDR CMOS / DDR LVDS |
| INL (typical) | ±1 LSB |
| DNL (typical) | ±0.3 LSB |
| Missing Codes | None over temperature |
| Transition Noise | 1.2 LSB RMS |
| Analog Supply Voltage | 1.8 V (typ) |
| Output Supply Voltage | 1.8 V to 3.3 V (separate DVDD supply pin) |
| Reference | Internal or external |
| Package | 64-QFN (9x9 mm) with exposed pad (UP) |
| Mounting Type | Surface Mount |
| Operating Temperature | 0 °C to +70 °C (C grade) |
| RoHS Status | Compliant (#PBF suffix) |
LTC2143CUP-14 Pin Configuration
| Pin 1 | GND — Ground |
| Pin 2 | INA+ — Channel A positive differential input |
| Pin 3 | INA- — Channel A negative differential input |
| Pin 4 | GND — Ground |
| Pin 5 | INB+ — Channel B positive differential input |
| Pin 6 | INB- — Channel B negative differential input |
| Pin 7 | GND — Ground |
| Pin 8 | REF — Reference voltage I/O |
| Pin 9 | REFT — Reference top decoupling |
| Pin 10 | REFB — Reference bottom decoupling |
| Pin 11 | MODE — Output mode select (CMOS/DDR CMOS/LVDS) |
| Pin 12 | GND — Ground |
| Pin 13 | OVDD — Output driver supply |
| Pin 14 | D0A — Channel A data output bit 0 (LSB) |
| Pin 15 | D1A — Channel A data output bit 1 |
| Pin 16 | D2A — Channel A data output bit 2 |
| Pin 17 | D3A — Channel A data output bit 3 |
| Pin 18 | D4A — Channel A data output bit 4 |
| Pin 19 | D5A — Channel A data output bit 5 |
| Pin 20 | D6A — Channel A data output bit 6 |
| Pin 21 | D7A — Channel A data output bit 7 |
| Pin 22 | D8A — Channel A data output bit 8 |
| Pin 23 | D9A — Channel A data output bit 9 |
| Pin 24 | D10A — Channel A data output bit 10 |
| Pin 25 | D11A — Channel A data output bit 11 |
| Pin 26 | D12A — Channel A data output bit 12 |
| Pin 27 | D13A — Channel A data output bit 13 (MSB) |
| Pin 28 | OGND — Output driver ground |
| Pin 29 | OVDD — Output driver supply |
| Pin 30 | D0B — Channel B data output bit 0 (LSB) |
| Pin 31 | D1B — Channel B data output bit 1 |
| Pin 32 | D2B — Channel B data output bit 2 |
| Pin 33 | D3B — Channel B data output bit 3 |
| Pin 34 | D4B — Channel B data output bit 4 |
| Pin 35 | D5B — Channel B data output bit 5 |
| Pin 36 | D6B — Channel B data output bit 6 |
| Pin 37 | D7B — Channel B data output bit 7 |
| Pin 38 | D8B — Channel B data output bit 8 |
| Pin 39 | D9B — Channel B data output bit 9 |
| Pin 40 | D10B — Channel B data output bit 10 |
| Pin 41 | D11B — Channel B data output bit 11 |
| Pin 42 | D12B — Channel B data output bit 12 |
| Pin 43 | D13B — Channel B data output bit 13 (MSB) |
| Pin 44 | OGND — Output driver ground |
| Pin 45 | CLKOUT+ — Differential clock output positive |
| Pin 46 | CLKOUT- — Differential clock output negative |
| Pin 47 | OGND — Output driver ground |
| Pin 48 | OVDD — Output driver supply |
| Pin 49 | ENC+ — Differential encode clock input positive |
| Pin 50 | ENC- — Differential encode clock input negative |
| Pin 51 | CS — Chip select / shutdown control |
| Pin 52 | GND — Ground |
| Pin 53 | AVDD — Analog 1.8 V supply |
| Pin 54 | AVDD — Analog 1.8 V supply |
| Pin 55 | GND — Ground |
| Pin 56 | VCM — Common-mode voltage output |
| Pin 57 | GND — Ground |
| Pin 58 | SENSE — Reference / ground sense pin |
| Pin 59 | GND — Ground |
| Pin 60 | AVDD — Analog 1.8 V supply |
| Pin 61 | AVDD — Analog 1.8 V supply |
| Pin 62 | GND — Ground |
| Pin 63 | AVDD — Analog 1.8 V supply |
| Pin 64 | AVDD — Analog 1.8 V supply |
Typical Applications
LTC2143CUP-14 is suitable for 6 applications: Cellular Base Station Receiver, Software Defined Radio (SDR) Front End, Multi-Channel Data Acquisition Card, Medical Ultrasound Beamformer, Portable Battery-Powered Instrumentation, Radar and Lidar Baseband Digitizer.
Cellular Base Station Receiver
The LTC2143CUP-14's two simultaneously-sampling 14-bit channels at 80 MSPS match the IF bandwidth of multi-carrier GSM/WCDMA/LTE receiver strips where the analog front end downconverts RF to a 70 MHz IF. The 1.2 LSB RMS transition noise and ±0.3 LSB DNL deliver the linearity required for adjacent-channel selectivity, while the LVDS output mode reduces simultaneous-switching noise coupling into the RF chain. Placed after the SAW filter and AGC, the ADC digitizes both polarizations for diversity combining in the baseband DSP.
Recommended
Software Defined Radio (SDR) Front End
The dual-channel architecture of the LTC2143CUP-14 captures I and Q baseband signals with matched gain and phase, which is essential for quadrature demodulation in SDR platforms. At 80 MSPS per channel the device digitizes up to 40 MHz of baseband bandwidth, sufficient for narrowband and many wideband waveforms. The CMOS/DDR/LVDS output flexibility lets the ADC connect directly to FPGAs implementing the digital downconversion and channelization. Differential inputs reject common-mode noise from the RF front end, preserving EVM in dense signal environments.
Recommended
Multi-Channel Data Acquisition Card
Multi-channel PCI/PCIe data acquisition cards use the LTC2143CUP-14 to digitize several analog inputs simultaneously at 80 MSPS, preserving inter-channel timing for vibration, sonar, and acoustic test systems. The 64-QFN exposed-pad package allows dense board layouts with multiple ADCs sharing a clock and reference. Differential inputs reject ground bounce from digital circuitry on the same PCB, while LVDS outputs minimize skew between ADC samples arriving at the FPGA. Synchronization across multiple boards is achieved by sharing the encode clock and the FRAME pulse.
Recommended
Medical Ultrasound Beamformer
Ultrasound systems use arrays of analog front ends feeding high-speed ADCs, where the LTC2143CUP-14's dual simultaneous sampling captures adjacent transducer channels with matched delay. The 14-bit resolution provides sufficient dynamic range for harmonic imaging while keeping power dissipation manageable in portable cart-based systems. LVDS outputs minimize EMI in the sensitive analog front end, and the small 9x9 mm QFN keeps the per-channel board area low for dense array designs. Designers leverage the matched channel-to-channel phase to compute beamformed images in the downstream DSP.
Recommended
Portable Battery-Powered Instrumentation
Handheld oscilloscopes, spectrum analyzers, and field test sets benefit from the LTC2143CUP-14's low power dissipation and dual-channel architecture. The 1.8 V analog supply and separate 1.8-3.3 V output supply allow direct interface to low-power FPGAs without level shifters, reducing total system power. The differential inputs reject switching noise from DC-DC converters that share the battery. The 64-QFN exposed pad provides thermal relief for continuous 80 MSPS operation on a 4-layer FR4 with adequate ground pour.
Recommended
Radar and Lidar Baseband Digitizer
Automotive and industrial radar/lidar baseband receivers use the LTC2143CUP-14 to digitize the I and Q outputs of the mixer at up to 80 MSPS per channel. The matched gain and phase of the two simultaneously-sampled channels preserve the complex-baseband signal structure required for FFT-based range and Doppler processing. The 14-bit resolution captures the dynamic range of chirp signals after LNA and VGA gain, while the LVDS output mode rejects noise on long PCB traces to the processing FPGA. Multiple ADCs can share an external reference for gain-matched multi-receiver arrays.
Recommended
Recommended Products Summary
Engineering reference data for LTC2143CUP-14 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LTC2144CUP-14 | LTC2145CUP-14 | LTC2142IUP-14 | LTC2174IUKG-14 | LTC2180IUP |
|---|---|---|---|---|---|---|
| Package | 64-QFN (UP, 9x9 mm) with exposed pad | 64-QFN (UP, 9x9 mm) - same | 64-QFN (UP, 9x9 mm) - same | 64-QFN (UP, 9x9 mm) - same | 64-QFN (UKG) - same family | 64-QFN (UP, 9x9 mm) - same |
| Brand | Analog Devices (formerly Linear Technology) | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 14 bit | 14 bit | 14 bit | 14 bit | 14 bit | 16 bit |
| Sample Rate (per channel) | 80 MSPS | 105 MSPS | 125 MSPS | 65 MSPS | 105 MSPS | 105 MSPS |
| Number of Channels | 2 (dual) | 2 (dual) | 2 (dual) | 2 (dual) | 2 (dual) | 2 (dual) |
| Architecture | Pipelined | Pipelined | Pipelined | Pipelined | Pipelined | Pipelined |
| Operating Temperature | 0 °C to +70 °C (C grade) | 0 °C to +70 °C | 0 °C to +70 °C | -40 °C to +85 °C (I grade) | -40 °C to +85 °C (I grade) | -40 °C to +85 °C (I grade) |
| Output Modes | CMOS / DDR CMOS / DDR LVDS | CMOS / DDR CMOS / DDR LVDS | CMOS / DDR CMOS / DDR LVDS | CMOS / DDR CMOS / DDR LVDS | CMOS / DDR CMOS / DDR LVDS | CMOS / DDR CMOS / DDR LVDS |
Key Differentiators
- Mid-tier sample rate within same-family pin-compatible family (vs LTC2145CUP-14)
- Pin-compatible upgrade for higher bandwidth (vs LTC2144CUP-14)
- Commercial vs industrial grade option (vs LTC2142IUP-14)
Design Notes
The LTC2143CUP-14 requires a multilayer PCB with a clean unbroken ground plane in the layer immediately beneath the ADC per the manufacturer datasheet. The exposed pad (pin 65) must be soldered to a ground pour with at least 16 thermal vias (0.3 mm hole, 0.6 mm pitch) to achieve the published thermal resistance and SNR. Low-ESR ceramic bypass capacitors (10 µF + 0.1 µF) must be placed within 2 mm of each AVDD and OVDD pin, with the 0.1 µF cap closest to the pin. Differential input traces should be length-matched within 0.5 mm to preserve inter-channel phase.
Estimated: at 80 MSPS continuous operation with both channels active and 1.8 V analog supply, the LTC2143CUP-14 dissipates roughly 100-130 mW (input values used: typical analog supply current from datasheet family). Forcing the unused channel clock divider or leaving channel B enabled when only A is needed wastes ~10% of total power. The MODE pin selects output mode (CMOS, DDR CMOS, DDR LVDS) and must be configured before reset release; leaving it floating at startup may place the outputs in an indeterminate state. Always provide an explicit logic level on CS and MODE during power-up.
Use the LVDS output mode whenever routing distance to the receiving FPGA exceeds 5 cm; CMOS edges at 80 MSPS generate switching noise that couples back into the analog inputs through the package and PCB. When CMOS mode is unavoidable, series-terminate each output with a 33 Ω resistor placed within 1 cm of the ADC pin to dampen reflections. The ENC+ and ENC- encode pins are differential inputs and should be AC-coupled or DC-coupled from a low-jitter clock source such as the AD9516; phase noise on the encode clock directly translates to aperture jitter and degrades SNR.
Compliance Information
RoHS compliant per #PBF suffix. Not AEC-Q100 qualified; for automotive see ADI's automotive-grade converter portfolio. Operating temperature 0 °C to +70 °C (C grade); I grade variant (LTC2143IUP-14) extends to -40 °C to +85 °C.
