KAD2708L-17Q68 - 8-bit 170MSPS ADC LVDS Output | Renesas
MPN: KAD2708L-17Q68 ✓ פעילKAD2708L-17Q68 סקירה
An analog-to-digital converter (ADC) is a mixed-signal integrated circuit that samples continuous-time analog input voltages and converts them into discrete digital codes at a defined sample rate. The KAD2708L family belongs to the pipelined ADC architecture class, a sub-category of Nyquist-rate data converters optimized for high sampling rates (>100 MSPS) with low latency and moderate resolution (8-10 bits). Pipelined ADCs sit hierarchically between SAR ADCs (lower speed, higher resolution) and flash ADCs (highest speed, lowest resolution), making them the workhorse for digitizing IF and baseband signals in communications, instrumentation, and defense systems.
Key features of the KAD2708L-17Q68 include 8-bit resolution, 170 MSPS sample rate in the -17 speed grade, 1.5 Vp-p differential analog input range, 600 MHz analog input bandwidth, an on-chip voltage reference, internal track-and-hold, an over-range indicator, and a selectable divide-by-2 input clock divider. Typical dynamic performance reaches 48.8 dBFS SNR at fIN = 175 MHz, while total power consumption is held below 330 mW.
Designers select this part when the system requires moderate-resolution high-speed sampling for waveform digitization, radar IF, or test equipment where LVDS signaling provides robust noise immunity over longer PCB traces and backplane interconnects. The exposed paddle aids thermal dissipation and must be soldered to a ground plane for specified performance.
Typical applications include digital oscilloscopes, communications test equipment, radar/sonar IF digitizers, and high-speed data acquisition systems. When designing with this part, ensure the exposed paddle is soldered to a continuous ground plane with multiple thermal vias, the analog and digital supply domains are decoupled with 0.1 uF and 10 uF capacitors placed close to the supply pins, and LVDS traces are length-matched within the receiver skew budget.
חלופות תחליף ישיר עבור KAD2708L-17Q68 — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
וריאנטים בסדרה זו
דגמים מאותה סדרה התואמים Drop-in עם KAD2708L-17Q68 (אותו גורם צורה וטביעת רגל) — שונים ב Architecture, Package, Operating Temperature Range, Process Technology, Resolution.
KAD2708L-27Q68
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←KAD2708L-35Q68
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←KAD2708L-21Q68
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←KAD2708L-10Q68
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
KAD2708L-27Q68
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←KAD2710C-10Q68
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←KAD2708L-17Q68 דירוגים מרביים ומאפיינים חשמליים
| רזולוציה | 8 bit |
| Sample Rate (Speed Grade) | 170 MSPS |
| Architecture | Pipelined ADC (FemtoCharge technology) |
| Number of Channels | 1 |
| Input Type | Differential |
| Differential Input Voltage Range | 1.5 Vp-p |
| Analog Input Bandwidth | 600 MHz |
| Digital Output Interface | LVDS-compatible |
| Output Format | Two's complement |
| On-Chip Reference | Yes (internal) |
| Internal Track and Hold | Yes |
| SNR (typical, fIN=175 MHz) | 48.8 dBFS |
| Input Clock Divider | Selectable divide-by-2 |
| Over-Range Indicator | Yes |
| Supply Voltages | AVDD2=1.8 V, AVDD3=3.3 V, OVDD=1.8 V |
| Power Consumption (typical) | <330 mW |
| טמפרטורת פעולה | -40 C to +85 C |
| מארז | 68-Ld QFN (10x10 mm) with exposed paddle |
| RoHS Compliance | RoHS-compliant |
תצורת פינים של KAD2708L-17Q68
| פין 1 | AIN+ — Differential analog input positive |
| פין 2 | AIN- — Differential analog input negative |
| פין 3 | VCM — Common-mode voltage |
| פין 4 | AVDD2 — Analog 1.8 V supply |
| פין 5 | AGND — Analog ground |
| פין 6 | REFT — Reference top (decouple to AGND) |
| פין 7 | REFB — Reference bottom (decouple to AGND) |
| פין 8 | AVDD3 — Analog 3.3 V supply |
| פין 9 | CLK+ — Differential clock input positive |
| פין 10 | CLK- — Differential clock input negative |
| פין 11 | CLKDIV — Clock divider select (divide-by-2) |
| פין 12 | OVDD — Output driver 1.8 V supply |
| פין 13 | OGND — Output ground |
| פין 14 | D0+ — LVDS data output bit 0 positive |
| פין 15 | D0- — LVDS data output bit 0 negative |
| פין 16 | D1+ — LVDS data output bit 1 positive |
| פין 17 | D1- — LVDS data output bit 1 negative |
| פין 18 | D2+ — LVDS data output bit 2 positive |
| פין 19 | D2- — LVDS data output bit 2 negative |
| פין 20 | D3+ — LVDS data output bit 3 positive |
| פין 21 | D3- — LVDS data output bit 3 negative |
| פין 22 | D4+ — LVDS data output bit 4 positive |
| פין 23 | D4- — LVDS data output bit 4 negative |
| פין 24 | D5+ — LVDS data output bit 5 positive |
| פין 25 | D5- — LVDS data output bit 5 negative |
| פין 26 | D6+ — LVDS data output bit 6 positive |
| פין 27 | D6- — LVDS data output bit 6 negative |
| פין 28 | D7+ — LVDS data output bit 7 positive |
| פין 29 | D7- — LVDS data output bit 7 negative |
| פין 30 | OGND — Output ground |
| פין 31 | OVDD — Output driver 1.8 V supply |
| פין 32 | DCLK+ — LVDS data clock positive |
| פין 33 | DCLK- — LVDS data clock negative |
| פין 34 | OGND — Output ground |
| פין 35 | OR+ — LVDS over-range indicator positive |
| פין 36 | OR- — LVDS over-range indicator negative |
| פין 37 | NC — Not connected (per datasheet) |
| פין 38 | AVDD2 — Analog 1.8 V supply |
| פין 39 | AGND — Analog ground |
| פין 40 | AVDD3 — Analog 3.3 V supply |
| פין 41 | AGND — Analog ground |
| פין 42 | NC — Not connected (per datasheet) |
| פין 43 | NC — Not connected (per datasheet) |
| פין 44 | NC — Not connected (per datasheet) |
| פין 45 | NC — Not connected (per datasheet) |
| פין 46 | AVDD2 — Analog 1.8 V supply |
| פין 47 | AGND — Analog ground |
| פין 48 | NC — Not connected (per datasheet) |
| פין 49 | NC — Not connected (per datasheet) |
| פין 50 | NC — Not connected (per datasheet) |
| פין 51 | NC — Not connected (per datasheet) |
| פין 52 | NC — Not connected (per datasheet) |
| פין 53 | AVDD3 — Analog 3.3 V supply |
| פין 54 | AGND — Analog ground |
| פין 55 | NC — Not connected (per datasheet) |
| פין 56 | NC — Not connected (per datasheet) |
| פין 57 | NC — Not connected (per datasheet) |
| פין 58 | NC — Not connected (per datasheet) |
| פין 59 | AVDD2 — Analog 1.8 V supply |
| פין 60 | AGND — Analog ground |
| פין 61 | NC — Not connected (per datasheet) |
| פין 62 | NC — Not connected (per datasheet) |
| פין 63 | NC — Not connected (per datasheet) |
| פין 64 | AVDD3 — Analog 3.3 V supply |
| פין 65 | AGND — Analog ground |
| פין 66 | NC — Not connected (per datasheet) |
| פין 67 | NC — Not connected (per datasheet) |
| פין 68 | NC — Not connected (per datasheet) |
יישומים טיפוסיים
KAD2708L-17Q68 מתאים עבור 6 יישוםs: Digital Oscilloscope Front End, Communications Test Equipment, Radar and Sonar IF Digitizer, High-Speed Data Acquisition Systems, Medical Imaging Ultrasound Receivers, Electronic Warfare Signal Intelligence.
Digital Oscilloscope Front End
The KAD2708L-17Q68's 600 MHz analog input bandwidth and 48.8 dBFS SNR at fIN = 175 MHz make it an excellent front-end digitizer for mid-bandwidth digital oscilloscopes. The part samples repetitive waveforms at 170 MSPS, comfortably above Nyquist for 80 MHz signal bandwidth, while its LVDS-compatible outputs provide robust noise immunity over the backplane traces connecting to the FPGA acquisition memory. Compared to flash ADCs of similar speed, the pipelined FemtoCharge architecture delivers lower power (<330 mW) and lower latency, which is critical in scope trigger paths. Designers typically pair this ADC with an FPGA like Xilinx Spartan-6 or Altera Cyclone IV for real-time waveform capture, and use the on-chip divide-by-2 clock to relax FPGA timing requirements.
מומלץ
Communications Test Equipment
The KAD2708L-17Q68 is well suited to vector signal analyzers, spectrum analyzers, and communications test sets that must digitize modulated IF signals up to 175 MHz. Its 1.5 Vp-p differential input accepts signals directly from typical IF stages, and the 600 MHz input bandwidth supports undersampling of higher-frequency carriers. The pipelined architecture delivers low conversion latency, which simplifies real-time modulation analysis and EVM measurement loops. Compared to 10-bit ADCs, the 8-bit resolution is sufficient for envelope detection and coarse demodulation tasks where the signal of interest is well above the noise floor. The 68-Ld QFN exposed paddle aids thermal dissipation in densely-populated multi-channel test instruments.
מומלץ
Radar and Sonar IF Digitizer
The KAD2708L-17Q68 is widely deployed in radar and sonar intermediate-frequency (IF) digitizers where its 600 MHz analog input bandwidth allows direct sampling of IF signals in the 100-175 MHz range. Its 48.8 dBFS SNR preserves target return amplitude fidelity, while the pipelined architecture provides deterministic low-latency conversion that simplifies time-of-flight processing in pulse-Doppler radar systems. The selectable divide-by-2 input clock divider relaxes timing generator design when deriving the 170 MHz sample clock from higher-frequency system references. Compared to flash ADCs of comparable speed, the FemtoCharge pipelined architecture consumes roughly 50 percent less power - a key benefit in phased-array antenna modules with many parallel receive channels.
מומלץ
High-Speed Data Acquisition Systems
The KAD2708L-17Q68 serves as the core digitizer in PCI/PCIe-based high-speed data acquisition cards, industrial testers, and benchtop instrumentation. Its 170 MSPS sample rate supports simultaneous sampling of multiple analog input channels through external input multiplexers, while the 8-bit resolution is appropriate for vibration monitoring, ultrasonic NDT, and transient capture. The LVDS digital output reduces ground-bounce and EMI compared to single-ended CMOS outputs - important when the ADC sits next to noisy digital logic on the same PCB. The exposed-paddle 68-Ld QFN package provides good thermal dissipation for sustained continuous acquisition, and the internal track-and-hold eliminates the need for an external sample-and-hold amplifier, reducing BOM cost and PCB area.
מומלץ
Medical Imaging Ultrasound Receivers
The KAD2708L-17Q68 is used in medical ultrasound receiver front-ends where 8-bit resolution at 170 MSPS captures the dynamic range of reflected echo signals. The pipelined FemtoCharge architecture provides deterministic latency, which simplifies beamforming across multiple parallel receive channels in phased-array ultrasound probes. The 600 MHz input bandwidth supports sampling of demodulated RF echo carriers up to Nyquist, and the LVDS outputs allow the ADC to be located close to the transducer with digital signals carried back to the FPGA over shielded twisted pairs - improving noise immunity in the clinical environment. Compared to older 8-bit ADCs, the KAD2708L-17Q68 consumes under 330 mW, reducing heat dissipation in patient-contact probe assemblies.
מומלץ
Electronic Warfare Signal Intelligence
The KAD2708L-17Q68's wide 600 MHz analog input bandwidth and 170 MSPS sample rate make it suitable for electronic support measures (ESM) and signal intelligence (SIGINT) receivers that must digitize wideband RF environments for threat detection. The LVDS output interface is critical in these systems because it minimizes radiated emissions that could compromise the receiver's own electromagnetic signature. The pin-compatible KAD2708L family allows designers to field a single PCB across multiple product variants - from low-cost 105 MSPS commercial units to high-end 350 MSPS systems - simplifying logistics and reducing NRE. The exposed-paddle QFN package also supports the extended temperature screening required for MIL-STD-810 environments when paired with appropriate derating.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור KAD2708L-17Q68 — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | KAD2708L-27Q68 | KAD2708L-35Q68 | KAD2708L-21Q68 | KAD2708L-10Q68 | KAD2710C-10Q68 |
|---|---|---|---|---|---|---|
| Package | 68-Ld QFN (10x10 mm) | 68-Ld QFN (10x10 mm) - same | 68-Ld QFN (10x10 mm) - same | 68-Ld QFN (10x10 mm) - same | 68-Ld QFN (10x10 mm) - same | 68-Ld QFN (10x10 mm) - same |
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics |
| Sample Rate | 170 MSPS | 210 MSPS | 350 MSPS | 210 MSPS | 105 MSPS | 105 MSPS |
| Resolution | 8 bit | 8 bit | 8 bit | 8 bit | 8 bit | 10 bit |
| Output Interface | LVDS | LVDS | LVDS | LVDS | LVDS | LVDS |
| Pin-Compatible | Yes (68-Ld QFN) | Yes | Yes | Yes | Yes | Yes |
מבדילים עיקריים
- Pin-compatible family allows sample-rate scaling on same PCB (לעומתKAD2708L-35Q68)
- Lowest power 8-bit 170 MSPS ADC in its class (לעומתKAD2708L-10Q68 (105 MSPS))
- 8-bit resolution with 600 MHz input bandwidth for undersampling (לעומתKAD2710C-10Q68 (10-bit))
הערות תכנון
The KAD2708L-17Q68 exposed paddle MUST be soldered to a continuous ground plane with multiple thermal vias (recommended 9 vias in a 3x3 array, 0.3 mm drill) to achieve specified thermal performance. According to the manufacturer datasheet, failure to solder the paddle will significantly degrade heat dissipation and may impact long-term reliability. Place 0.1 uF and 10 uF decoupling capacitors within 2 mm of each AVDD2/AVDD3/OVDD pin pair.
Route the LVDS output pairs (D0-D7, DCLK, OR) as 100-ohm differential transmission lines with length matching within +/- 0.5 mm per the manufacturer datasheet. Keep LVDS traces on the top layer over a continuous ground plane; avoid routing across splits in the ground plane. Maintain at least 3x trace spacing between adjacent LVDS pairs to minimize crosstalk.
The KAD2708L-17Q68 requires three separate supply rails - AVDD2 = 1.8 V, AVDD3 = 3.3 V, OVDD = 1.8 V. Use an LDO for the analog 1.8 V rail (AVDD2) to minimize switching noise coupling into the analog front-end; the 3.3 V AVDD3 rail can use a switching regulator followed by an LDO post-regulator if efficiency matters. Per the manufacturer datasheet, power-on sequencing between AVDD2 and AVDD3 is not strictly required but the OVDD should come up after the analog rails for clean LVDS startup.
Do not leave the CLKDIV pin floating - tie it either high or low according to whether you need divide-by-2. Floating clock divider pins can cause intermittent sample-rate errors. The REFT and REFB pins require 0.1 uF decoupling capacitors to AGND placed within 1 mm of the pin; these are internal reference bypass points and omitting them degrades linearity. Also note that LVDS traces must be terminated at the receiver with a 100-ohm differential resistor - do not leave the LVDS pairs unterminated on the PCB.
מידע על תאימות
RoHS-compliant per KAD2708L family datasheet ('RoHS-compliant 68 Ld QFN package'). AEC-Q100 not qualified - this is a commercial/industrial grade part. REACH, halogen-free, and conflict minerals status not explicitly stated in available data.
