KAD2708L-27Q68 - 8-Bit 275MSPS ADC LVCMOS QFN-68 | Renesas
MPN: KAD2708L-27Q68 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $38.5 | $38.50 |
| 10 | $35.2 | $352.00 |
| 100 | $31.75 | $3,175.00 |
| 500 | $28.1 | $14,050.00 |
| 1,000 | $24.95 | $24,950.00 |
KAD2708L-27Q68 Overview
An ADC (analog-to-digital converter) is a data-conversion integrated circuit that translates continuous-time analog signals into discrete digital codes at a rate set by its sampling clock. High-speed pipeline ADCs such as the KAD2708L sit at the top of the data-converter taxonomy: ADC -> pipeline ADC -> high-speed ADC -> data converter IC -> mixed-signal semiconductor. They are used wherever wideband analog signals must be digitized for downstream DSP, FPGA, or ASIC processing.
Differentiating specifications include 48.8 dBFS SNR at fIN = 175 MHz, 600 MHz full-power analog input bandwidth, less than 330 mW power consumption at full sample rate, an internal track-and-hold, on-chip reference, and a selectable divide-by-2 clock input. The FemtoCharge™ switched-capacitor architecture enables the low-power figure while preserving dynamic performance in the second Nyquist zone.
The device uses a 1.5 VPP differential analog input, LVCMOS digital outputs, and an LVDS-style clock input (LVDS/LVCMOS compatible). It also features an over-range indicator and configurable CMOS output timing, simplifying board-level FPGA capture. RoHS-compliant 68-QFN packaging with exposed paddle keeps the die-to-ambient thermal resistance low for sustained high-speed operation.
Typical applications include radar intermediate-frequency (IF) digitizers, broadband test-and-measurement equipment, communications receiver IF chains, and high-speed medical imaging front ends. The combination of 8-bit resolution, 275 MSPS sampling, and low power suits cost-sensitive yet performance-demanding designs.
When designing with this part, keep analog input traces length-matched for 50 Ohm differential impedance, place the exposed paddle over a continuous ground pour, and decouple AVDD and DRVDD separately to limit digital switching noise coupling back into the analog front end.
This page synthesizes distributor pricing, same-family drop-in alternatives (KAD2708L-35Q68, KAD2708L-21Q68, KAD2708L-10Q68), and practical design notes not aggregated in the manufacturer datasheet.
Drop-in alternatives for KAD2708L-27Q68 — 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 KAD2708L-27Q68 (same form factor and footprint) — differing in Architecture, Package, Number of Channels, Resolution, Operating Temperature Range.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
KAD2708L-35Q68
✅ Drop-In✓ In Stock
$19.5 / Unit
View Datasheet →KAD2708L-21Q68
✅ Drop-In✓ In Stock
$22.5 / Unit
View Datasheet →KAD2708L-17Q68
✅ Drop-In✓ In Stock
$18.4 / Unit
View Datasheet →KAD2708L-10Q68
✅ Drop-In📋 Reference alternative (not in catalog)
KAD2710C-21Q68
✅ Drop-In✓ In Stock
$9.85 / Unit
View Datasheet →KAD2708L-27Q68 Maximum Ratings & Electrical Characteristics
| Resolution | 8 bit |
| Number of Channels | 1 |
| Sample Rate (Speed Grade) | 275 MSPS |
| Architecture | Pipelined, FemtoCharge™ switched-capacitor |
| Analog Input Type | Differential |
| Full-Scale Differential Input Voltage | 1.5 VPP |
| Full Power Input Bandwidth (FPBW) | 600 MHz |
| SNR (fIN = 175 MHz) | 48.8 dBFS |
| Power Consumption (typ) | < 330 mW at 275 MSPS |
| Digital Output Type | LVCMOS |
| Clock Input | LVDS/LVCMOS compatible, divide-by-2 selectable |
| Reference | Internal on-chip |
| Track-and-Hold | Internal |
| Over-Range Indicator | Yes |
| Operating Temperature Range | -40C to +85C |
| Package | 68-lead QFN with exposed paddle |
| RoHS Compliance | Compliant |
| Process Technology | Standard CMOS |
KAD2708L-27Q68 68-lead qfn with exposed paddle Pin Configuration Guide
Pin configuration for KAD2708L-27Q68 (68-lead qfn with exposed paddle package). This analog component features input, output, and power supply pins. Refer to the manufacturer datasheet for offset null, compensation, and enable pin configurations. Ideal for signal conditioning and amplifier circuits.
No detailed pinout data available for KAD2708L-27Q68.
Refer to the datasheet for full pin configuration.
Typical Applications
KAD2708L-27Q68 is suitable for 6 applications: Radar IF Digitizer, Digital Oscilloscope / Test Equipment, Communications Receiver IF Chain, Medical Ultrasound Imaging Front End, High-Speed Data Acquisition Card, Digital Predistortion Feedback Path.
Radar IF Digitizer
The KAD2708L-27Q68's 600 MHz full-power input bandwidth and 275 MSPS sample rate make it a strong fit for digitizing intermediate-frequency signals in pulsed-Doppler and FMCW radar receivers. By under-sampling IFs up to ~275 MHz directly, designers can eliminate a second downconversion stage, reducing BOM and phase-noise budget. The 48.8 dBFS SNR at 175 MHz preserves enough dynamic range for target detection, while the 1.5 VPP differential input simplifies AC-coupled interface to the radar mixer. The 68-QFN exposed-paddle package spreads dissipation across the ground pour, supporting continuous sampling in sealed radar front ends.
Recommended
Digital Oscilloscope / Test Equipment
Digitizer front ends in mid-bandwidth oscilloscopes, spectrum analyzers, and bench-top instruments can leverage the KAD2708L-27Q68's combination of 8-bit resolution and 275 MSPS sampling. The 600 MHz analog bandwidth captures harmonics of repetitive signals up to ~250 MHz, while the LVCMOS outputs interface directly to an FPGA capture buffer without requiring an LVDS deserializer. Power consumption below 330 mW keeps the channel-card thermal budget manageable in multi-channel scope mainframes, and the internal track-and-hold eliminates the need for an external sample-and-hold amplifier in the analog front end.
Recommended
Communications Receiver IF Chain
In software-defined radio (SDR) and digital-IF receiver architectures, the KAD2708L-27Q68 digitizes the second IF output of a superheterodyne chain, allowing channel selection, demodulation, and filtering to be performed in the FPGA. Its LVCMOS output bus feeds directly into a low-cost FPGA without an LVDS receiver, and the 48.8 dBFS SNR is sufficient for demodulation of QAM and QPSK signals at the second-IF stage. The 1.5 VPP differential input pairs with standard IF transformer interfaces used in cellular base-station receivers, and the exposed-paddle 68-QFN package supports dense multi-channel receiver card layouts.
Recommended
Medical Ultrasound Imaging Front End
Ultrasound beamforming front ends use banks of high-speed ADCs to digitize the time-gated echoes from piezoelectric transducer arrays. The KAD2708L-27Q68's 275 MSPS sample rate supports 2x oversampling of transducers centered around 5-10 MHz, while the 1.5 VPP differential input is well-matched to the typical TGC (time-gain-compensated) amplifier output. The FemtoCharge™ architecture's low power dissipation (<330 mW) is critical in densely-packed multi-channel probe-head assemblies where thermal management is challenging. The 8-bit resolution is appropriate for B-mode imaging at typical clinical dynamic-range requirements.
Recommended
High-Speed Data Acquisition Card
PCIe- and PXI-based data acquisition cards for vibration analysis, modal testing, and rotating-machinery monitoring use the KAD2708L-27Q68 to digitize wideband accelerometer and IEPE sensor signals. The 600 MHz input bandwidth captures high-frequency vibration harmonics beyond 100 kHz, while the 275 MSPS throughput streams continuous data to the host processor via an FPGA buffer. The 68-QFN package's small footprint allows 4-8 channels per card, and the LVCMOS output bus reduces FPGA pin count compared to LVDS-interface parts. Industrial operating temperature range (-40C to +85C) supports deployment in factory and field environments.
Recommended
Digital Predistortion Feedback Path
Cellular base-station power amplifier linearization requires a high-speed feedback ADC to capture the PA output and compute digital predistortion coefficients in real time. The KAD2708L-27Q68's 600 MHz analog bandwidth and 275 MSPS throughput support DPD feedback paths for multi-carrier GSM/UMTS/LTE PAs operating at frequencies up to ~2.7 GHz when the PA output is first downconverted. The 48.8 dBFS SNR is sufficient to capture the third- and fifth-order intermodulation products that drive the predistortion algorithm, and the LVCMOS outputs feed directly into the DPD FPGA engine without serialization overhead.
Recommended
Recommended Products Summary
Engineering reference data for KAD2708L-27Q68 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | KAD2708L-35Q68 | KAD2708L-21Q68 | KAD2708L-17Q68 | KAD2710C-21Q68 |
|---|---|---|---|---|---|
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics |
| Package | 68-QFN | 68-QFN - same | 68-QFN - same | 68-QFN - same | 68-QFN - same |
| Resolution | 8 bit | 8 bit | 8 bit | 8 bit | 10 bit |
| Sample Rate | 275 MSPS | 350 MSPS | 210 MSPS | 170 MSPS | 210 MSPS |
| Digital Output Type | LVCMOS | LVCMOS | LVCMOS | LVCMOS | LVCMOS |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
Key Differentiators
- Pin-compatible family with 5 speed grades (105/170/210/275/350 MSPS) (vs AD9051BRSRL)
- 10-bit upgrade path in identical footprint (vs KAD2710C-21Q68)
- Industry-leading low power <330 mW at 275 MSPS (vs AD9051BRSRL)
Design Notes
Estimated from the 1.5 VPP differential input spec and 600 MHz bandwidth: route the analog input pair as a 100-ohm differential transmission line with length-matched traces (±0.5 mm) to an external 1:1 balun. Place the balun within 5 mm of the AIN+/AIN- pins to preserve the 600 MHz FPBW. The exposed paddle (EP) must be soldered to a continuous ground pour with at least 8 thermal vias to a separate inner ground plane to keep the junction-to-ambient thermal resistance low during continuous 275 MSPS operation.
Estimated: decouple AVDD (analog supply) and DRVDD (digital output supply) separately using a 10 uF tantalum + 0.1 uF ceramic + 10 nF ceramic stack placed within 3 mm of each supply pin. Use a ferrite bead between AVDD and DRVDD rails to break the high-frequency digital switching noise path back into the analog front end. Ground returns should follow a star-topology back to a single low-impedance ground point under the exposed paddle.
The LVCMOS outputs of the KAD2708L-27Q68 produce fast edges (sub-1 ns rise time) that couple strongly into adjacent analog traces if not properly isolated. Route the 8-bit output bus on the opposite side of the ground plane from the analog input traces, use 33 ohm series damping resistors at the FPGA end, and add 50 ohm terminations if the trace length exceeds 25 mm. The over-range flag (OR) output should be connected to the FPGA for automatic gain-control feedback in radar and instrumentation designs.
Compliance Information
RoHS-compliant 68-QFN package confirmed in Intersil/Renesas datasheet. Halogen-free and conflict-minerals status not explicitly stated in the verified data — set to 'unknown'. Not AEC-Q100 qualified; not designed for automotive safety-critical applications.
