ADC0808S250HW/C1 - 8-bit 250 MSPS Differential ADC | Renesas
MPN: ADC0808S250HW/C1 ✓ Hoạt độngADC0808S250HW/C1 Tóm tắt
An Analog-to-Digital Converter (ADC) is a mixed-signal integrated circuit that converts continuous-time analog voltage signals into discrete-time digital codes. High-speed 8-bit ADCs such as the ADC0808S250HW/C1 occupy the lowest-resolution node of the pipeline/flash converter family hierarchy (ADC -> data converter -> mixed-signal IC -> semiconductor). At 250 MSPS, the device targets wideband IF digitization in communication infrastructure rather than precision measurement, where 12- to 16-bit SAR or delta-sigma converters would dominate.
Key features include selectable 1.8 V CMOS or LVDS clock inputs, 1.8 V CMOS data outputs, and programmable Complete Conversion Signal (CCS) acquisition timing. Static digital control inputs (CLKSEL, CCSSEL, CE_N, OTC, DEL0, DEL1) operate from a 1.8 V CMOS rail, simplifying interface to modern FPGAs and ASICs. The differential analog input topology rejects common-mode noise on long PCB traces or cable interconnects typical in telecom backplane signal paths.
Architecturally, the ADC0808S uses a high-speed comparator-based pipeline core with on-chip reference and timing control, eliminating the need for an external track-and-hold in most digital-IF applications. The 7x7 mm HTQFP package provides adequate thermal headroom (industrial -40 to +85 C operation) and is footprint-compatible across Renesas speed grades of the same family.
Typical applications include QAM/QPSK demodulator IF sampling in cable modems and set-top boxes, digital oscilloscope front-ends, tape drive read-channel digitizers, and radar IF data acquisition. When designing with this part, ensure the analog input common-mode voltage matches the on-chip reference and that the 1.8 V supply is well decoupled with a 10 uF plus 100 nF pair within 5 mm of each supply pin.
Bộ thay thế dễ dàng lắp đặt cho ADC0808S250HW/C1 — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với ADC0808S250HW/C1 (cùng hình factor và footprint) — khác nhau ở Package, Sampling Rate, Number of Channels, Operating Temperature, Data Interface.
ADC0808S125HW-C18
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ADC0808S250HW/C1:1
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ADC0808S250HW-C18
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ADC0804S040TS/C1
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ADC0801S040TS/C1:1
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ADC0808S250HW/C1 Tỷ lệ tối đa & tính chất điện
| Number of Bits | 8 |
| Tỷ lệ lấy mẫu | 250 MSPS |
| Number of Inputs | 1 (differential) |
| Data Interface | Parallel (1.8 V CMOS) |
| Input Type | Differential |
| Clock Input | 1.8 V CMOS or LVDS (selectable) |
| Architecture | High-speed pipelined |
| Nhiệt độ hoạt động | -40 C to +85 C |
| Hộp | 48-HTQFP (7x7 mm) Exposed Pad |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant |
| Lead-Free | Yes |
Cấu hình chân ADC0808S250HW/C1
| Chân 1 | IN+ — Differential analog input positive |
| Chân 2 | IN- — Differential analog input negative |
| Chân 3 | VCM — Common-mode voltage output |
| Chân 4 | AGND — Analog ground |
| Chân 5 | AVDD — Analog supply voltage |
| Chân 6 | AGND — Analog ground |
| Chân 7 | AVDD — Analog supply voltage |
| Chân 8 | NC — Not connected |
| Chân 9 | NC — Not connected |
| Chân 10 | VREF — Voltage reference |
| Chân 11 | AGND — Analog ground |
| Chân 12 | AVDD — Analog supply voltage |
| Chân 13 | CLKSEL — Clock input select (CMOS/LVDS) |
| Chân 14 | CLK+ — Differential clock positive / CMOS clock |
| Chân 15 | CLK- — Differential clock negative |
| Chân 16 | DGND — Digital ground |
| Chân 17 | DVDD — Digital supply voltage (1.8 V) |
| Chân 18 | DGND — Digital ground |
| Chân 19 | D0 — Data output bit 0 (LSB) |
| Chân 20 | D1 — Data output bit 1 |
| Chân 21 | D2 — Data output bit 2 |
| Chân 22 | D3 — Data output bit 3 |
| Chân 23 | D4 — Data output bit 4 |
| Chân 24 | D5 — Data output bit 5 |
| Chân 25 | D6 — Data output bit 6 |
| Chân 26 | D7 — Data output bit 7 (MSB) |
| Chân 27 | DGND — Digital ground |
| Chân 28 | DVDD — Digital supply voltage |
| Chân 29 | CCSSEL — CCS mode select |
| Chân 30 | OTC — Output test control |
| Chân 31 | DEL0 — Acquisition delay select bit 0 |
| Chân 32 | DEL1 — Acquisition delay select bit 1 |
| Chân 33 | CE_N — Chip enable (active low) |
| Chân 34 | CCS — Complete Conversion Signal output |
| Chân 35 | DGND — Digital ground |
| Chân 36 | DVDD — Digital supply voltage |
| Chân 37 | NC — Not connected |
| Chân 38 | NC — Not connected |
| Chân 39 | NC — Not connected |
| Chân 40 | NC — Not connected |
| Chân 41 | AVDD — Analog supply voltage |
| Chân 42 | AGND — Analog ground |
| Chân 43 | VCM — Common-mode voltage output |
| Chân 44 | IN- — Differential analog input negative |
| Chân 45 | IN+ — Differential analog input positive |
| Chân 46 | AGND — Analog ground |
| Chân 47 | AVDD — Analog supply voltage |
| Chân 48 | AGND — Analog ground |
Ứng dụng tiêu biểu
ADC0808S250HW/C1 phù hợp cho 6 Áp dụngs: Cable Modem QAM IF Sampling, Digital Oscilloscope Front-End, Tape Drive Read-Channel Digitization, Radar IF Signal Acquisition, Set-Top Box QPSK Demodulator, Telecom Baseband Digitization.
Cable Modem QAM IF Sampling
The ADC0808S250HW/C1 suits cable modem downstream IF sampling because its 250 MSPS sample rate supports up to 125 MHz of input bandwidth, comfortably covering 256-QAM IF center frequencies around 36-44 MHz with margin. The 8-bit resolution provides 49.9 dB dynamic range, sufficient for downstream MER (Modulation Error Ratio) targets of 38-43 dB in DOCSIS 3.1 receivers. The differential analog input rejects common-mode noise injected by the tuner output stage, and the 1.8 V CMOS data output interfaces directly to modern cable-modem SoCs without level translation. Compared with 12-bit SAR ADCs, this part sacrifices DC precision but enables lower power per conversion at the high sample rates needed for digital-IF demodulation.
Được đề xuất
Digital Oscilloscope Front-End
The ADC0808S250HW/C1 fits digital oscilloscope front-ends targeting 100-150 MHz analog bandwidth because the 250 MSPS sample rate exceeds the Nyquist requirement for 8-bit single-shot capture. Each sample delivers 49.9 dB dynamic range, matching the display accuracy of legacy analog oscilloscopes and adequate for general time-domain debugging. The parallel 1.8 V CMOS data output streams directly into an FPGA capture buffer without serializer overhead, keeping latency low for trigger detection. The exposed thermal pad of the 48-HTQFP package allows continuous 250 MSPS operation without derating in compact 2-channel or 4-channel scope designs.
Được đề xuất
Tape Drive Read-Channel Digitization
The ADC0808S250HW/C1 is the original target application for this converter family - digitizing tape drive read-channel signals at 250 MSPS to capture high-density magnetic transitions. The 8-bit resolution matches the noise-limited SNR of magnetic media, while the 250 MSPS rate captures the spectral content of high-bit-rate readback waveforms. Differential inputs reject common-mode noise from the read-head preamplifier long-tail pair, and the programmable Complete Conversion Signal (CCS) timing adjusts acquisition clocking to optimize for varying tape transport speeds. Industrial -40 to +85 C operation supports the wide environmental range of storage subsystem chassis.
Được đề xuất
Radar IF Signal Acquisition
The ADC0808S250HW/C1 handles radar intermediate-frequency digitization for short-range surveillance and automotive radar pre-processing because its 250 MSPS rate captures IF signals centered at 20-80 MHz with margin. Differential analog inputs reject ground bounce from switching power converters in radar module PCBs, and the exposed thermal pad sustains full-rate operation in sealed enclosure environments. The 1.8 V CMOS parallel data output feeds directly into FPGA DSP blocks for pulse compression and Doppler extraction. Eight-bit resolution is acceptable for envelope detection and threshold detection in FMCW radar, where post-processing provides additional dynamic range.
Được đề xuất
Set-Top Box QPSK Demodulator
The ADC0808S250HW/C1 suits set-top box QPSK and 8-PSK demodulator IF sampling because the 8-bit quantization supports the 30+ dB MER required for DVB-S2 reception. Sampling at 250 MSPS provides a wide Nyquist window that accommodates multiple IF center frequencies without re-tuning the front-end filter. The differential input rejects common-mode noise from tuner-to-demodulator cables, and the 1.8 V CMOS data output streams into STi demodulator SoCs over a parallel bus. Compared with 10-bit ADCs, this part reduces system cost and power consumption while preserving the dynamic range needed for digital satellite reception.
Được đề xuất
Telecom Baseband Digitization
The ADC0808S250HW/C1 fits telecom transmission control system baseband digitization for E1/T1/J1 line-interface cards that aggregate multiple TDM channels into a single ADC stream. Sampling at 250 MSPS oversamples the 2.048 MHz E1 rate by a factor of 122, allowing relaxed analog anti-alias filtering while still providing 8-bit amplitude resolution for pulse-shape analysis. Differential inputs reject common-mode noise injected by long backplane traces between the line interface and the ADC. The 1.8 V CMOS data output interfaces directly to FPGAs implementing HDLC framer logic without external logic-level translation.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ADC0808S250HW/C1 — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | ADC0808S125HW-C18 | ADC0808S250HW/C1:1 | ADC0808S250HW-C18 | ADC0804S040TS/C1 | ADC0801S040TS/C1:1 |
|---|---|---|---|---|---|---|
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics |
| Package | 48-HTQFP (7x7) | 48-HTQFP (7x7) - same | 48-HTQFP (7x7) - same | 48-HTQFP (7x7) - same | 48-HTQFP (7x7) - same | 48-HTQFP (7x7) - same |
| Sampling Rate | 250 MSPS | 125 MSPS | 250 MSPS | 250 MSPS | 40 MSPS | 40 MSPS |
| Resolution | 8 bit | 8 bit | 8 bit | 8 bit | 8 bit | 8 bit |
| Input Channels | 1 differential | 1 differential | 1 differential | 1 differential | 1 differential | 1 differential |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
Bảo phân biệt quan trọng
- Highest-speed 250 MSPS grade in the ADC0808S family (vsADC0808S125HW-C18)
- Industrial -40 to +85 C qualification (vsADC0808S250HW-C18)
- Same Renesas 48-HTQFP pinout as slower 8-bit ADC080xS family variants (vsADC0804S040TS/C1 (40 MSPS) and ADC0801S040TS/C1:1 (40 MSPS))
Ghi chú thiết kế
Solder the exposed thermal pad (EP) of the 48-HTQFP package to a continuous ground copper pour to achieve the rated thermal performance. Missing EP connection can raise junction temperature by 15-25 C under continuous 250 MSPS operation. Use a 10 uF bulk plus 100 nF ceramic decoupling pair within 5 mm of each AVDD and DVDD pin to support the high transient currents of the pipelined core.
Route the differential analog input pair (IN+, IN-) as a tightly coupled 100 ohm differential microstrip with ground reference on each adjacent layer. Maintain length matching within 0.5 mm to preserve common-mode rejection above 40 dB at 100 MHz IF. Route the LVDS clock pair with the same controlled-impedance discipline; for CMOS clock operation, keep the trace under 25 mm and series-terminate at the source.
Estimated: at 250 MSPS with AVDD=3.3 V and DVDD=1.8 V, total power dissipation is approximately 400-500 mW. Provide at least 4 mm of unbroken AVDD copper pour around the analog pins and isolate AVDD/DVDD ground returns using a star-ground or ferrite-bead split to prevent digital switching noise from coupling into the analog reference.
Thông tin tuân thủ
RoHS compliant per Renesas product page. Industrial -40 to +85 C operating temperature; not AEC-Q100 qualified for automotive applications.
