KAD2708C-10Q68 - 8-Bit 105MSPS LVCMOS ADC | Renesas
MPN： KAD2708C-10Q68 ✓ 啟用中KAD2708C-10Q68 概覽
An analog-to-digital converter (ADC) is a mixed-signal integrated circuit that samples a continuous-time analog waveform and converts each sample into a discrete digital code. Within the broader IC hierarchy, an ADC belongs to data converters, which sit inside the signal chain alongside digital-to-analog converters (DACs), amplifiers, and sensors. High-speed 8-bit ADCs like the KAD2708C family are used to digitize wideband intermediate-frequency (IF) or baseband signals in communications, imaging, and instrumentation systems where sample rates from 100 MSPS to several hundred MSPS are required.
Key features include a 105 MSPS maximum conversion rate, LVCMOS output levels that interface directly to ASICs and FPGAs, an over-range indicator for automatic gain control (AGC) loops, and a selectable divide-by-2 input clock divider that simplifies board-level clock generation. The 1.8 V single-supply operation reduces regulator count and power dissipation in portable and dense designs. The 68-lead QFN with exposed paddle provides a low thermal-resistance path, enabling sustained operation across the -40 °C to +85 °C industrial temperature range.
Technically, FemtoCharge technology uses a switched-capacitor pipeline architecture that achieves sub-picofarad input capacitance and very low aperture jitter, which is critical for preserving SNR when digitizing high-frequency IF signals. The on-chip input buffer and track-and-hold front end relax external driver requirements, while the internal voltage reference eliminates the need for an external reference IC in most applications.
Typical applications include digital oscilloscopes, radar and lidar receivers, ultrasound imaging front ends, communication IF digitizers, and general-purpose high-speed data acquisition. The wide input bandwidth and low power make the part well suited for portable test equipment and embedded signal analyzers where board area and battery life matter.
When designing with this device, place the input coupling network as close as possible to the analog input pins and route LVCMOS outputs with matched impedance to avoid skew across the 8-bit bus. The exposed paddle must be soldered to a properly sized ground plane for both electrical grounding and thermal dissipation. This page synthesizes distributor pricing, drop-in same-family alternatives, and practical PCB layout notes not aggregated on any single manufacturer or distributor page.
直接替換替代品，適用於 KAD2708C-10Q68 — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： KAD2708C-10Q68 （相同外形與佔位） — 差異在於 Input Type, Package, Architecture, Process Technology, Resolution.
KAD2708C-17Q68
✅ 直接替換聯絡詢價
查看資料表 →KAD2708C-21Q68
✅ 直接替換📋 參考替代品（不在目錄中）
KAD2708C-27Q68
✅ 直接替換聯絡詢價
查看資料表 →KAD2710C-10Q68
✅ 直接替換聯絡詢價
查看資料表 →KAD2710C-17Q68
✅ 直接替換聯絡詢價
查看資料表 →HI5767/4CBZ-T
✅ 直接替換聯絡詢價
查看資料表 →KAD2708C-10Q68 最大額定值與電氣特性
| 解析度 | 8 bits |
| Number of Channels | 1 |
| Sample Rate | 105 MSPS (max) |
| Architecture | FemtoCharge switched-capacitor pipeline |
| Input Type | Differential analog input |
| Digital Output Type | LVCMOS |
| 供應電壓 | 1.8 V (single supply) |
| Power Dissipation | <265 mW |
| SNR | 49.2 dBFS at fIN = 138 MHz |
| Input Clock Divider | Selectable divide-by-2 |
| Over-Range Indicator | Yes |
| 封裝 | 68-pin QFN with exposed paddle (RoHS-compliant) |
| 工作溫度範圍 | -40 °C to +85 °C |
| Process Technology | Standard CMOS |
| RoHS Compliance | Compliant |
KAD2708C-10Q68 68-pin qfn with exposed paddle (rohs-compliant) 腳位配置指南
KAD2708C-10Q68（68-pin qfn with exposed paddle (rohs-compliant) 封裝）的腳位配置。 此類比元件具有輸入、輸出與電源腳位。偏移歸零、補償與致能腳位配置請參閱製造商資料表。適用於訊號調理與放大器電路。
無詳細腳位定義資料： KAD2708C-10Q68.
請參閱 資料表 以查看完整腳位配置。
典型應用
KAD2708C-10Q68 適用於 6 應用s: Digital Oscilloscope Front End, Radar and Lidar IF Digitizer, Ultrasound Imaging Beamformer, Communication IF Baseband Digitizer, Portable Test and Measurement, Industrial High-Speed Data Acquisition.
Digital Oscilloscope Front End
The KAD2708C-10Q68's 105 MSPS sample rate and 49.2 dBFS SNR at 138 MHz input make it well suited for digitizing the IF stage of a digital oscilloscope or spectrum analyzer. Placed after the front-end attenuator and variable-gain amplifier, the ADC's single 1.8 V supply and sub-265 mW dissipation reduce thermal load inside sealed enclosures. The LVCMOS outputs route directly to an FPGA capture memory, and the exposed-paddle QFN provides a low-impedance ground path that preserves SNR at full bandwidth. Compared with a faster KAD2708C-27Q68, the -10 variant trades speed for the lowest possible power, which is valuable in portable USB oscilloscopes where battery runtime matters.
推薦
Radar and Lidar IF Digitizer
Radar and lidar receivers downconvert the antenna signal to a low IF that must be digitized with sufficient sample rate to preserve range and Doppler information. The KAD2708C-10Q68's 105 MSPS rate comfortably covers IF frequencies up to ~40 MHz, while its 49.2 dBFS SNR at 138 MHz preserves amplitude accuracy for target detection. The part's 1.8 V single supply simplifies board power design in airborne or vehicle-mounted lidar modules where weight and component count matter. The selectable divide-by-2 clock input lets designers use a common low-jitter oscillator family across multiple speed grades.
推薦
Ultrasound Imaging Beamformer
In ultrasound imaging, each transducer element requires a dedicated high-speed ADC to capture the returning echo before beamforming summation. The KAD2708C-10Q68's 105 MSPS sample rate and 8-bit resolution match the bandwidth of typical 3-5 MHz ultrasound probes when sampling at the third or fourth harmonic. Its 1.8 V single-supply operation minimizes per-channel power dissipation, which is critical when a probe head contains 64 or 128 channels in a tight mechanical envelope. The 68-pin QFN with exposed paddle provides an efficient thermal path so multiple ADCs can be tiled densely.
推薦
Communication IF Baseband Digitizer
Software-defined radio (SDR) and broadband wireless receivers digitize the downconverted IF directly into an FPGA for channelization and demodulation. The KAD2708C-10Q68's LVCMOS outputs drive FPGA LVCMOS banks directly without level translators, simplifying PCB routing. At 49.2 dBFS SNR with a 138 MHz input, the part provides enough dynamic range for demodulating wideband waveforms such as LTE, Wi-Fi, or proprietary OFDM signals after a final IF stage below ~40 MHz. The 1.8 V supply aligns with modern FPGA bank voltages, allowing a shared low-noise regulator.
推薦
Portable Test and Measurement
Battery-powered spectrum analyzers, signal tracers, and field test sets need ADCs that maximize sample rate while minimizing power. The KAD2708C-10Q68 delivers 105 MSPS at under 265 mW, an excellent trade-off for handheld instruments that sample moderate-bandwidth IF signals. Its 8-bit resolution is sufficient for spectrum-viewing applications where the dynamic range is bounded by the analog front end. The 68-pin QFN footprint and exposed paddle support dense 4-layer PCB layouts typical of portable enclosures. A slower but pin-compatible KAD2708C variant could be substituted for ultra-low-power trickle-mode operation.
推薦
Industrial High-Speed Data Acquisition
Industrial vibration monitoring, machine-vision preprocessing, and control-loop feedback require deterministic high-speed ADC sampling in electrically noisy environments. The KAD2708C-10Q68's 49.2 dBFS SNR preserves signal integrity at 138 MHz IF, and its single 1.8 V supply simplifies galvanic isolation design by reducing the number of isolated rails. The -40 °C to +85 °C industrial temperature range covers most factory-floor environments without additional thermal management. The exposed-paddle QFN package supports standard reflow profiles and high-density board stacking used in 19-inch rack instrumentation.
推薦
推薦產品摘要
工程參考資料，適用於 KAD2708C-10Q68 — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | KAD2708C-17Q68 | KAD2708C-21Q68 | KAD2708C-27Q68 | KAD2710C-10Q68 | KAD2710C-17Q68 | HI5767/4CBZ-T |
|---|---|---|---|---|---|---|---|
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics |
| Package | 68-pin QFN with exposed paddle | 68-pin QFN with exposed paddle - same | 68-pin QFN with exposed paddle - same | 68-pin QFN with exposed paddle - same | 68-pin QFN with exposed paddle - same | 68-pin QFN with exposed paddle - same | 68-pin QFN with exposed paddle - same |
| Resolution | 8 bits | 8 bits | 8 bits | 8 bits | 10 bits | 10 bits | 10 bits |
| Sample Rate | 105 MSPS | 170 MSPS | 210 MSPS | 275 MSPS | 105 MSPS | 170 MSPS | 40 MSPS |
| Output Type | LVCMOS | LVCMOS | LVCMOS | LVCMOS | LVCMOS | LVCMOS | LVCMOS |
| Supply Voltage | 1.8 V | 1.8 V | 1.8 V | 1.8 V | 1.8 V | 1.8 V | 3.3 V (typical) |
| Architecture | FemtoCharge pipeline | FemtoCharge pipeline | FemtoCharge pipeline | FemtoCharge pipeline | FemtoCharge pipeline | FemtoCharge pipeline | CMOS pipeline |
主要差異化特點
- Lowest power of the KAD2708C pin-compatible family (對比KAD2708C-27Q68)
- Pin-compatible 10-bit resolution upgrade path (對比KAD2710C-10Q68)
- FemtoCharge technology enables low 1.8 V single-supply operation (對比HI5767/4CBZ-T)
設計說明
Place the analog input RC network (typically a 25 ohm series resistor plus a few-pF differential capacitor) within 5 mm of the VIN+/VIN- pins to control the input bandwidth and isolate the ADC from amplifier kickback. Route LVCMOS outputs in matched-length groups to the FPGA, keeping the digital bus away from the analog input traces. The exposed paddle (EP) must be soldered to a continuous ground plane stitched with multiple thermal vias (typically 9 to 16 vias in a 3x3 grid) for both electrical grounding and thermal dissipation above 200 mW.
The KAD2708C-10Q68 requires a clean 1.8 V analog supply. Place a ferrite bead or small inductor between the analog 1.8 V rail and the digital 1.8 V rail, with at least 10 uF of bulk ceramic capacitance plus 0.1 uF and 1 nF decoupling right at each AVDD pin. Estimated: at 265 mW total dissipation in a QFN with theta_JA of approximately 28 C/W on a 4-layer PCB, junction rise above ambient is roughly 7-8 C, well within the 125 C limit - no heatsink required.
Do not exceed the 1.8 V supply absolute maximum; the on-chip ESD diodes clamp transient overshoot but sustained over-voltage will damage the input ESD structure. Ensure the LVCMOS output drive strength matches the FPGA bank's drive setting to avoid reflections on long PCB traces. The divide-by-2 clock divider selection input must be tied to a defined logic level (not left floating) to prevent metastable clock operation at startup.
合規資訊
RoHS-compliant per the 68-pin RoHS-compliant QFN package statement in the Renesas datasheet. Not AEC-Q100 qualified - this part targets industrial and commercial temperature grades, not automotive.
