ADS808Y/250 - 12-Bit 70MSPS ADC, HTQFP-48 | Texas Instruments
MPN: ADS808Y/250 ✓ نشطADS808Y/250 نظرة عامة
An analog-to-digital converter (ADC) is a mixed-signal integrated circuit that samples a continuous analog voltage and quantizes each sample into a discrete digital code. Pipelined ADCs such as the ADS808 use a cascaded architecture of low-resolution stages (typically 1.5 bits per stage) with digital error correction, achieving the best trade-off between sampling speed (tens to hundreds of MSPS), resolution (10-14 bits), and active power. Within the broader hierarchy, the ADS808 sits under data converter -> ADC -> pipelined ADC -> high-speed ADC -> mixed-signal IC -> semiconductor. Pipelined ADCs are the dominant topology for communications, instrumentation, and imaging applications in the 10 MSPS to 250 MSPS range.
Key features of the ADS808 include 70 MSPS sampling rate, selectable full-scale input range, internal or external voltage reference, a low-jitter 0.25 ps RMS track-and-hold, single 5V analog supply operation, and a powerdown mode for portable applications. The differential or single-ended clock input accepts TTL/CMOS/LVPECL swings and provides flexible timing for synchronization with downstream DSP or FPGA logic. Its premium track-and-hold maintains low distortion even at IF frequencies, simplifying front-end design in communications receivers.
Typical applications for the ADS808Y/250 include CCD imaging digitizers, digital still cameras, basestation receiver IF digitizers, medical ultrasound beamformers, video processing, and high-speed data acquisition cards. The 12-bit/70-MSPS combination is well suited to digitizing signals in the 1 MHz to 35 MHz IF band where 70 dB SNR and SFDR are required for downstream demodulation. For test and measurement, the device serves as a general-purpose ADC front-end for digitizing oscilloscope channels and spectrum analyzer intermediate frequencies.
When designing with the ADS808, place a 0.1 uF ceramic decoupling capacitor within 5 mm of every supply pin, and use a 10 uF bulk tantalum or ceramic capacitor on AVDD and DRVDD to suppress switching noise. Provide a clean, low-jitter clock source (jitter < 1 ps RMS) to preserve SNR at high input frequencies, and route analog and digital grounds on separate planes joined at a single point beneath the IC.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
بدائل مباشرة لـ ADS808Y/250 — نفس الحزمة، متوافق دبوس بدبوس. تُستثنى القطع ذات الحزم المختلفة التي تتطلب تعديل PCB.
الطرازات في هذه السلسلة
طرازات من نفس السلسلة متوافقة تمامًا مع ADS808Y/250 (نفس عامل الشكل والبصمة) — يختلف في Package, Resolution, Analog Supply Voltage, Sampling Rate, Data Interface.
ADS808Y/2K
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
ADS808Y/250G4
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←ADS805E/1KG4
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←ADS7841PBG4
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←ADS5424IPJYG3
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←ADS850
✅ بديل مباشر ⚠️ مواصفات غير مُتحقق منها📋 بديل مرجعي (غير موجود في الكتالوج)
ADS808Y/250 الحدود القصوى والخصائص الكهربائية
| الدقة | 12 bit |
| معدل أخذ العينات | 70 MSPS |
| Number of Input Channels | 1 |
| Architecture | Pipelined |
| Analog Supply Voltage | 4.75 V to 5.25 V |
| Digital Supply Voltage | 3.0 V to 5.25 V |
| Input Type | Single-Ended or Differential |
| Full-Scale Input Range | Selectable (1.0 Vpp or 2.0 Vpp) |
| Reference | Internal or External |
| Track-and-Hold Jitter | 0.25 ps RMS |
| Clock Input | Single-Ended or Differential, TTL/CMOS/LVPECL |
| Powerdown Mode | Yes |
| العلبة | HTQFP-48 (PHP) 7x7 mm |
| نوع التركيب | Surface Mount |
| درجة حرارة التشغيل | -40 C to +85 C |
| مستوى MSL | 2 |
| حالة RoHS | Compliant |
تكوين أطراف ADS808Y/250
| دبوس 1 | AVDD — Analog supply voltage, 5V nominal |
| دبوس 2 | IN — Analog input, single-ended or positive differential |
| دبوس 3 | INB — Complementary analog input for differential mode |
| دبوس 4 | REF — Reference voltage (internal) or reference input (external mode) |
| دبوس 5 | REFB — Reference ground, connect to analog ground |
| دبوس 6 | FSR — Full-scale range select (1.0 Vpp or 2.0 Vpp) |
| دبوس 7 | REFEN — Reference enable (internal vs external select) |
| دبوس 8 | PD — Powerdown mode, active high |
| دبوس 9 | AVSS — Analog ground |
| دبوس 10 | AVDD — Analog supply voltage, 5V nominal |
| دبوس 11 | AVSS — Analog ground |
| دبوس 12 | CLK — Clock input, single-ended or positive differential |
| دبوس 13 | CLKB — Complementary clock input for differential mode |
| دبوس 14 | DRVDD — Digital output driver supply, 3.0V to 5.25V |
| دبوس 15 | DRVSS — Digital output driver ground |
| دبوس 16 | D11 — Data output bit 11 (MSB) |
| دبوس 17 | D10 — Data output bit 10 |
| دبوس 18 | D9 — Data output bit 9 |
| دبوس 19 | D8 — Data output bit 8 |
| دبوس 20 | D7 — Data output bit 7 |
| دبوس 21 | D6 — Data output bit 6 |
| دبوس 22 | D5 — Data output bit 5 |
| دبوس 23 | D4 — Data output bit 4 |
| دبوس 24 | D3 — Data output bit 3 |
| دبوس 25 | D2 — Data output bit 2 |
| دبوس 26 | D1 — Data output bit 1 |
| دبوس 27 | D0 — Data output bit 0 (LSB) |
| دبوس 28 | DRVSS — Digital output driver ground |
| دبوس 29 | DRVDD — Digital output driver supply |
| دبوس 30 | NC — Not connected |
| دبوس 31 | NC — Not connected |
| دبوس 32 | NC — Not connected |
| دبوس 33 | AVSS — Analog ground |
| دبوس 34 | AVDD — Analog supply voltage |
| دبوس 35 | AVSS — Analog ground |
| دبوس 36 | AVDD — Analog supply voltage |
| دبوس 37 | AVSS — Analog ground |
| دبوس 38 | AVDD — Analog supply voltage |
| دبوس 39 | AVSS — Analog ground |
| دبوس 40 | NC — Not connected |
| دبوس 41 | NC — Not connected |
| دبوس 42 | NC — Not connected |
| دبوس 43 | NC — Not connected |
| دبوس 44 | NC — Not connected |
| دبوس 45 | NC — Not connected |
| دبوس 46 | AVSS — Analog ground |
| دبوس 47 | AVDD — Analog supply voltage |
| دبوس 48 | AVSS — Analog ground |
التطبيقات النموذجية
ADS808Y/250 مناسب لـ 6 التطبيقs: CCD Imaging Digitizer, Base Station IF Receiver Digitizer, Medical Ultrasound Beamformer, High-Speed Data Acquisition Card, Digital Video Broadcast Processing, Industrial Test and Measurement.
CCD Imaging Digitizer
The ADS808Y/250 is well-suited for CCD imaging front-ends where 12-bit resolution at 70 MSPS captures each pixel's charge with adequate dynamic range for still and video cameras. Its 0.25 ps RMS track-and-hold jitter preserves SNR across the wide bandwidth of CCD output buffers, and the selectable full-scale range lets designers match CCD swing without external attenuation. In a typical CCD digitizer, the ADS808 sits after a correlated double-sampler and provides 12-bit parallel CMOS/TTL output to an image processor or FPGA.
موصى به
Base Station IF Receiver Digitizer
In basestation receivers, the ADS808Y/250 digitizes IF signals in the 10-35 MHz band with SFDR sufficient for downstream digital demodulation. At 70 MSPS, the converter captures cellular IF signals with margin for oversampling and digital filtering. The flexible single-ended or differential clock input accommodates LVPECL backplane clocks common in basestation designs, while the 5V analog supply simplifies power tree integration with legacy RF front-end components.
موصى به
Medical Ultrasound Beamformer
Ultrasound beamformer channels require sampling rates that capture the RF return signal with sufficient dynamic range to resolve subtle tissue features. The ADS808Y/250 delivers 12-bit/70 MSPS - a good fit for general-purpose ultrasound at frequencies up to 35 MHz. The 0.25 ps RMS track-and-hold jitter preserves SNR at high RF frequencies, while the 5V supply simplifies integration with analog front-end LNA and TGC stages. Multiple ADS808 channels can be synchronized via the flexible clock input for phased-array beamforming.
موصى به
High-Speed Data Acquisition Card
PCI/PCIe data acquisition cards use the ADS808Y/250 as a general-purpose digitizer channel for oscilloscope, spectrum analyzer, and arbitrary waveform recorder front-ends. At 70 MSPS and 12 bits, the ADC supports real-time sampling of signals up to the Nyquist limit with sufficient resolution for most measurement tasks. The internal reference option reduces BOM, while the external reference path enables calibration against a precision voltage standard for metrology-grade accuracy.
موصى به
Digital Video Broadcast Processing
The ADS808Y/250 digitizes component video and broadcast IF signals in set-top boxes, video editing equipment, and broadcast infrastructure. Its single 5V supply simplifies integration with analog video amplifier stages, while the selectable full-scale range adapts to different video signal levels (0.7 Vpp consumer, 1.0 Vpp broadcast). The 12-bit resolution exceeds broadcast video quality requirements and supports both SD and EDTV formats at 70 MSPS.
موصى به
Industrial Test and Measurement
Test and measurement instruments such as benchtop oscilloscopes and spectrum analyzers use the ADS808Y/250 as a single-channel or multi-channel digitizer front-end. Its pipelined architecture supports repetitive and real-time sampling modes, and the differential clock input accepts precision LVPECL synthesizers for jitter-sensitive measurements. Powerdown mode allows standby operation when not digitizing, reducing thermal dissipation in multi-channel instruments.
موصى به
ملخص المنتجات الموصى بها
بيانات مرجعية هندسية لـ ADS808Y/250 — المقارنة وإرشادات التصميم ومعلومات الامتثال.
دليل الاختيار
المقارنة مع البدائل
| المعامل | هذا المنتج | ADS808Y/2K | ADS808Y/250G4 | ADS805E/1KG4 | ADS5424IPJYG3 |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | HTQFP-48 (PHP) 7x7 mm | HTQFP-48 (PHP) 7x7 mm - same | HTQFP-48 (PHP) 7x7 mm - same | HTQFP-48 (PHP) - same family | HTQFP-48 - same family |
| Resolution | 12 bit | 12 bit | 12 bit | 12 bit | 14 bit |
| Sampling Rate | 70 MSPS | 70 MSPS | 70 MSPS | 20 MSPS | 105 MSPS |
| Analog Supply Voltage | 4.75 V to 5.25 V | 4.75 V to 5.25 V | 4.75 V to 5.25 V | 4.75 V to 5.25 V | 5.0 V |
| Input Channels | 1 | 1 | 1 | 1 (with 4:1 mux) | 1 |
| Full-Scale Range | Selectable 1.0 Vpp or 2.0 Vpp | Selectable 1.0 Vpp or 2.0 Vpp | Selectable 1.0 Vpp or 2.0 Vpp | Selectable | Selectable |
| Pin Count | 48 | 48 | 48 | 48 | 48 |
أبرز الفروقات
- Highest sample rate in the 48-HTQFP-48 12-bit TI ADS80x family (مقابلADS805E/1KG4)
- Lower resolution than 14-bit pin-compatible alternates (مقابلADS5424IPJYG3)
- Single-channel architecture versus built-in mux variants (مقابلADS805E/1KG4)
ملاحظات التصميم
Place a 0.1 uF X7R ceramic decoupling capacitor within 5 mm of every AVDD and DRVDD pin, and add a 10 uF bulk tantalum or ceramic capacitor on each supply rail. The ADS808Y/250 draws analog and digital supply current that varies with sampling rate - at 70 MSPS, expect ~250 mA from AVDD. Use a ferrite bead to isolate the analog 5V rail from noisy digital supplies.
Clock jitter directly degrades SNR at high input frequencies: SNR_limit = -20*log10(2*pi*fIN*jitter). At fIN = 35 MHz and 0.25 ps RMS jitter, the theoretical SNR limit is ~66 dB. Use a low-jitter clock source such as a clean crystal oscillator or LVPECL synthesizer. Route the clock trace over a continuous ground plane and keep it short to minimize reflections.
Route analog and digital grounds on separate planes joined at a single point beneath the IC exposed thermal pad. Place input traces as a 50 ohm controlled-impedance differential pair if using differential inputs, and keep analog input traces away from digital output traces (D0-D11). The exposed thermal pad must be soldered to a ground plane for rated thermal performance.
Do not exceed AVDD = 5.25V absolute maximum or the IC may suffer permanent damage. Drive unused NC pins to a known state (tie to ground or leave floating per datasheet) to avoid stray coupling. When using the internal reference, ensure REFEN pin is tied appropriately; when using an external reference, decouple REF pin with a 0.1 uF capacitor.
معلومات الامتثال
RoHS compliant per TI product page. Standard /250 part may not be lead-free; select ADS808Y/250G4 for Pb-free reflow. Not AEC-Q100 qualified - this part is intended for industrial/commercial applications.
