ADC0808S250HW/C1 - 8-bit 250 MSPS Differential ADC | Renesas
MPN: ADC0808S250HW/C1 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $18.5 | $18.50 |
| 10 | $16.2 | $162.00 |
| 100 | $13.85 | $1,385.00 |
| 500 | $11.4 | $5,700.00 |
| 1,000 | $9.65 | $9,650.00 |
ADC0808S250HW/C1 Overview
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.
Drop-in alternatives for ADC0808S250HW/C1 — 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 ADC0808S250HW/C1 (same form factor and footprint) — differing in Package, Sampling Rate, Number of Channels, Operating Temperature, Data Interface.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADC0808S125HW-C18
✅ Drop-In✓ In Stock
$11.65 / Unit
View Datasheet →ADC0808S250HW/C1:1
✅ Drop-In✓ In Stock
$9.95 / Unit
View Datasheet →ADC0808S250HW-C18
✅ Drop-In✓ In Stock
$8.5 / Unit
View Datasheet →ADC0804S040TS/C1
✅ Drop-In✓ In Stock
$4.05 / Unit
View Datasheet →ADC0801S040TS/C1:1
✅ Drop-In✓ In Stock
$1.95 / Unit
View Datasheet →ADC0808S250HW/C1 Maximum Ratings & Electrical Characteristics
| Number of Bits | 8 |
| Sampling Rate | 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 |
| Operating Temperature | -40 C to +85 C |
| Package | 48-HTQFP (7x7 mm) Exposed Pad |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Lead-Free | Yes |
ADC0808S250HW/C1 Pin Configuration
| Pin 1 | IN+ — Differential analog input positive |
| Pin 2 | IN- — Differential analog input negative |
| Pin 3 | VCM — Common-mode voltage output |
| Pin 4 | AGND — Analog ground |
| Pin 5 | AVDD — Analog supply voltage |
| Pin 6 | AGND — Analog ground |
| Pin 7 | AVDD — Analog supply voltage |
| Pin 8 | NC — Not connected |
| Pin 9 | NC — Not connected |
| Pin 10 | VREF — Voltage reference |
| Pin 11 | AGND — Analog ground |
| Pin 12 | AVDD — Analog supply voltage |
| Pin 13 | CLKSEL — Clock input select (CMOS/LVDS) |
| Pin 14 | CLK+ — Differential clock positive / CMOS clock |
| Pin 15 | CLK- — Differential clock negative |
| Pin 16 | DGND — Digital ground |
| Pin 17 | DVDD — Digital supply voltage (1.8 V) |
| Pin 18 | DGND — Digital ground |
| Pin 19 | D0 — Data output bit 0 (LSB) |
| Pin 20 | D1 — Data output bit 1 |
| Pin 21 | D2 — Data output bit 2 |
| Pin 22 | D3 — Data output bit 3 |
| Pin 23 | D4 — Data output bit 4 |
| Pin 24 | D5 — Data output bit 5 |
| Pin 25 | D6 — Data output bit 6 |
| Pin 26 | D7 — Data output bit 7 (MSB) |
| Pin 27 | DGND — Digital ground |
| Pin 28 | DVDD — Digital supply voltage |
| Pin 29 | CCSSEL — CCS mode select |
| Pin 30 | OTC — Output test control |
| Pin 31 | DEL0 — Acquisition delay select bit 0 |
| Pin 32 | DEL1 — Acquisition delay select bit 1 |
| Pin 33 | CE_N — Chip enable (active low) |
| Pin 34 | CCS — Complete Conversion Signal output |
| Pin 35 | DGND — Digital ground |
| Pin 36 | DVDD — Digital supply voltage |
| Pin 37 | NC — Not connected |
| Pin 38 | NC — Not connected |
| Pin 39 | NC — Not connected |
| Pin 40 | NC — Not connected |
| Pin 41 | AVDD — Analog supply voltage |
| Pin 42 | AGND — Analog ground |
| Pin 43 | VCM — Common-mode voltage output |
| Pin 44 | IN- — Differential analog input negative |
| Pin 45 | IN+ — Differential analog input positive |
| Pin 46 | AGND — Analog ground |
| Pin 47 | AVDD — Analog supply voltage |
| Pin 48 | AGND — Analog ground |
Typical Applications
ADC0808S250HW/C1 is suitable for 6 applications: 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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
Recommended Products Summary
Engineering reference data for ADC0808S250HW/C1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | 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 |
Key Differentiators
- Highest-speed 250 MSPS grade in the ADC0808S family (vs ADC0808S125HW-C18)
- Industrial -40 to +85 C qualification (vs ADC0808S250HW-C18)
- Same Renesas 48-HTQFP pinout as slower 8-bit ADC080xS family variants (vs ADC0804S040TS/C1 (40 MSPS) and ADC0801S040TS/C1:1 (40 MSPS))
Design Notes
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.
Compliance Information
RoHS compliant per Renesas product page. Industrial -40 to +85 C operating temperature; not AEC-Q100 qualified for automotive applications.
