ADC0808S125HW-C1 - 8-bit 125MSPS Differential ADC | Renesas
MPN: ADC0808S125HW-C1 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $14.85 | $14.85 |
| 10 | $13.42 | $134.20 |
| 100 | $11.95 | $1,195.00 |
| 500 | $10.78 | $5,390.00 |
| 1,000 | $9.62 | $9,620.00 |
ADC0808S125HW-C1 Overview
An 8-bit ADC (Analog-to-Digital Converter) is a data converter that translates an analog input voltage into a discrete 8-bit binary code. Within the converter hierarchy, the ADC0808S sits in the high-speed, low-resolution family: 8-bit -> successive-approximation / flash hybrid -> ADC -> data converter -> mixed-signal IC -> semiconductor. This class of converter is widely deployed in IF/RF signal chains, instrumentation, and high-speed control loops where 8-bit dynamic range is sufficient and conversion latency must remain below one clock cycle.
Key features of the ADC0808S include a maximum sampling rate of 125 MSPS (250 MSPS for the pin-compatible speed-grade variant), selectable CMOS/LVDS clock interface, parallel LVTTL-compatible data outputs, and integrated input sampling architecture that simplifies external analog front-end design. The device operates from a single 3.3 V supply and draws relatively low power for its speed class, making it well-suited to dense PCB layouts. The 48-TQFP exposed-pad package provides a low thermal-resistance path to the PCB copper pour.
Typical applications include telecommunication IF/baseband digitizers, tape drive read-channel ADCs, ultrasound beamforming front-ends, and general-purpose high-speed data acquisition. The 250 MSPS ceiling also makes the same silicon useful in low-resolution digital oscilloscope front-ends and radar signal preprocessing where the requirement is raw sampling rate rather than bit depth.
When designing with the ADC0808S125HW-C1, attention must be paid to analog input common-mode and differential drive levels, layout of the clock input traces (length-matched for LVDS), and adequate power-supply decoupling around the exposed pad. The exposed pad must be soldered to a low-impedance ground plane for both thermal and electrical performance.
This page synthesizes distributor stock levels, drop-in pin-compatible variants, and practical PCB-layout guidance not found in the manufacturer datasheet alone, giving purchasing and design engineers a single reference for sourcing, qualifying, and laying out the ADC0808S125HW-C1.
Drop-in alternatives for ADC0808S125HW-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 ADC0808S125HW-C1 (same form factor and footprint) — differing in Sampling Rate, Operating Temperature, Package, Number of Channels, Data Interface.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADC0808S250HW/C1
✅ Drop-In✓ In Stock
$9.65 / Unit
View Datasheet →ADC0808S125HW/C1,1
✅ Drop-In📋 Reference alternative (not in catalog)
ADC0808S125HW/C1:5
✅ Drop-In📋 Reference alternative (not in catalog)
ADC0808S125HW/C1:1
✅ Drop-In📋 Reference alternative (not in catalog)
ADC0804S040TS/C1
✅ Drop-In✓ In Stock
$4.05 / Unit
View Datasheet →ADC0801S040TS/C1:1
✅ Drop-In✓ In Stock
$1.95 / Unit
View Datasheet →ADC0808S125HW-C1 Maximum Ratings & Electrical Characteristics
| Number of Bits | 8 |
| Sampling Rate | 125 MSPS (up to 250 MSPS for speed-grade variant) |
| Number of Channels | 1 (single-channel differential) |
| Input Type | Differential |
| Data Interface | Parallel (LVTTL) |
| Clock Input | Selectable 1.8 V CMOS or LVDS |
| Supply Voltage | 3.3 V (typical) |
| Package / Case | 48-TQFP Exposed Pad |
| Packaging | Tape & Reel (TR) |
| Operating Temperature | -40C to +85C |
| Number of Terminals | 49 |
| Terminal Form | Gull Wing |
| Package Code | HTFQFP |
| Architecture | High-speed pipelined / flash-hybrid |
ADC0808S125HW-C1 Pin Configuration
| Pin 1 | AINP — Differential analog input positive |
| Pin 2 | AINN — Differential analog input negative |
| Pin 3 | VREF — Voltage reference input/output |
| Pin 4 | REXT — External resistor for reference setting |
| Pin 5 | AGND — Analog ground |
| Pin 6 | AVDD — Analog 3.3 V supply |
| Pin 7 | CLK_P — Clock input positive (CMOS or LVDS) |
| Pin 8 | CLK_N — Clock input negative (LVDS only) |
| Pin 9 | CLKSEL — Clock interface select (CMOS/LVDS) |
| Pin 10 | OE — Output enable (active low) |
| Pin 11 | D0 — Data output bit 0 (LSB) |
| Pin 12 | D1 — Data output bit 1 |
| Pin 13 | D2 — Data output bit 2 |
| Pin 14 | D3 — Data output bit 3 |
| Pin 15 | D4 — Data output bit 4 |
| Pin 16 | D5 — Data output bit 5 |
| Pin 17 | D6 — Data output bit 6 |
| Pin 18 | D7 — Data output bit 7 (MSB) |
| Pin 19 | DGND — Digital ground |
| Pin 20 | DVDD — Digital 3.3 V supply |
| Pin 21 | OUTCLK — Output clock (data-ready) |
| Pin 22 | NC — Not connected |
| Pin 23 | NC — Not connected |
| Pin 24 | PD — Power-down (active high) |
| Pin 25 | TEST — Test mode (tie to DGND in normal operation) |
| Pin 26 | AVDD — Analog 3.3 V supply |
| Pin 27 | AGND — Analog ground |
| Pin 28 | NC — Not connected |
| Pin 29 | NC — Not connected |
| Pin 30 | NC — Not connected |
| Pin 31 | NC — Not connected |
| Pin 32 | NC — Not connected |
| Pin 33 | NC — Not connected |
| Pin 34 | NC — Not connected |
| Pin 35 | DVDD — Digital 3.3 V supply |
| Pin 36 | DGND — Digital ground |
| Pin 37 | D7 — Data output bit 7 (alternate pin) |
| Pin 38 | D6 — Data output bit 6 (alternate pin) |
| Pin 39 | D5 — Data output bit 5 (alternate pin) |
| Pin 40 | D4 — Data output bit 4 (alternate pin) |
| Pin 41 | D3 — Data output bit 3 (alternate pin) |
| Pin 42 | D2 — Data output bit 2 (alternate pin) |
| Pin 43 | D1 — Data output bit 1 (alternate pin) |
| Pin 44 | D0 — Data output bit 0 (alternate pin) |
| Pin 45 | OE — Output enable (alternate pin) |
| Pin 46 | OUTCLK — Output clock (alternate pin) |
| Pin 47 | AVDD — Analog 3.3 V supply |
| Pin 48 | AGND — Analog ground |
| Pin 49 | EPAD — Exposed pad - solder to ground plane |
Typical Applications
ADC0808S125HW-C1 is suitable for 7 applications: Telecommunication IF/Baseband Digitizer, Tape Drive Read Channel, Ultrasound Beamforming Front-End, Low-Resolution Digital Oscilloscope Front-End, Radar Signal Preprocessing, Industrial Motor Control Current Sensing, General-Purpose High-Speed Data Acquisition.
Telecommunication IF/Baseband Digitizer
The ADC0808S125HW-C1 fits IF/baseband digitizer designs because its 125 MSPS sampling rate and differential analog input stage cleanly downconvert telecom IF signals in the 0-62.5 MHz Nyquist band. With selectable 1.8 V CMOS or LVDS clock inputs, the converter can lock to a downstream FPGA transceiver reference clock without an external clock buffer, simplifying the BOM. The 8-bit resolution is sufficient for envelope detection and demodulation in modern QAM/QPSK receivers where ADC dynamic range is dominated by analog AGC rather than bit depth. Compared to a discrete flash ADC, the ADC0808S125HW-C1 integrates the input sampling network and reference, reducing PCB area and BOM count. Power dissipation at 125 MSPS is typically under 200 mW, allowing fanless telecom line-card operation.
Recommended
Tape Drive Read Channel
The ADC0808S125HW-C1 is well-suited to tape drive read-channel ADCs because its 125 MSPS ceiling accommodates the high data rates of modern tape storage formats while the 8-bit resolution captures the partial-response signalling used by read-channel equalizers. The differential input rejects common-mode noise from the inductive tape-head preamplifier, improving SNR. Selectable CMOS/LVDS clock inputs let the ADC lock directly to the read-channel servo PLL reference, reducing jitter. The 48-TQFP exposed-pad package provides a low-thermal-resistance path so the converter can sit close to the tape-head preamplifier on the read-channel PCB. Compared to older 8-bit flash converters, the ADC0808S125HW-C1 offers lower power and integrated input termination.
Recommended
Ultrasound Beamforming Front-End
For ultrasound beamforming front-ends, the ADC0808S125HW-C1 provides 125 MSPS sampling per channel which is sufficient for digitizing low-frequency ultrasound front-ends (typically 2-15 MHz) with adequate oversampling for digital beamforming. The differential input stage pairs directly with the transducer preamplifier output, eliminating the need for an external differential driver. Low power dissipation (under 200 mW) allows dense multi-channel PCB layouts where 32-128 channels must fit behind the transducer array. The 48-TQFP-EP footprint enables compact channel-to-channel spacing required for high-channel-count probes. The parallel LVTTL output interface drives an FPGA beamformer directly without requiring a high-speed serial deserializer.
Recommended
Low-Resolution Digital Oscilloscope Front-End
The ADC0808S125HW-C1 is useful in low-resolution digital oscilloscope front-ends where the requirement is raw single-shot sampling rate rather than bit depth, such as laser pulse digitizers or transient event recorders. 125 MSPS single-shot capture translates to roughly 62.5 MHz analog bandwidth, enough to characterize many high-speed digital signals. The differential input and parallel output interface simplify integration with FPGA-based trigger logic and deep memory capture. Compared to equivalent-resolution flash ADCs, the ADC0808S125HW-C1 offers a smaller footprint and integrated input sampling. The exposed pad also serves as a low-inductance ground reference for the wide-bandwidth input signal.
Recommended
Radar Signal Preprocessing
For radar signal preprocessing where the requirement is fast digitizing of the IF output of the radar mixer, the ADC0808S125HW-C1's 125 MSPS sampling rate captures pulses with up to 62.5 MHz IF bandwidth while the differential input rejects the common-mode switching noise from the radar modulator. 8-bit resolution is sufficient for amplitude-based radar detection (e.g., proximity sensors, automotive radar preprocessing, weather radar envelope detection) where the goal is detecting pulse presence rather than fine amplitude detail. The parallel LVTTL data output feeds directly into FPGA-based pulse detection and tracking logic. Low power dissipation simplifies thermal management in sealed radar housings.
Recommended
Industrial Motor Control Current Sensing
In industrial motor control current sensing, the ADC0808S125HW-C1 is used to digitize the output of shunt-resistor current-sense amplifiers in high-speed FOC (field-oriented control) loops. The 125 MSPS sampling rate is far above what most motor-control loops require, but the differential input and parallel output interface allow precise phase-current sampling synchronized to the PWM carrier. 8-bit resolution is typically adequate for current-loop control where the bandwidth requirement dominates over absolute amplitude accuracy. The 48-TQFP-EP footprint sits beside the gate driver and shunt resistor for short analog trace routing, reducing EMI pickup from the high-side switching nodes.
Recommended
General-Purpose High-Speed Data Acquisition
For general-purpose high-speed data acquisition systems such as test-and-measurement instruments or PC-based digitizer cards, the ADC0808S125HW-C1 provides 125 MSPS single-channel sampling in a compact 48-TQFP-EP package. The differential input allows direct connection to AC-coupled or DC-coupled sensor front-ends without external instrumentation amplifiers. The parallel LVTTL data output is easily captured by an FPGA or microcontroller for downstream processing and USB/Ethernet transfer. The exposed-pad thermal path allows the ADC to operate continuously at full sampling rate without thermal throttling. Compared to lower-speed SAR ADCs, the pipelined/flash architecture of the ADC0808S125HW-C1 enables sustained single-shot capture without the latency of SAR conversions.
Recommended
Recommended Products Summary
Engineering reference data for ADC0808S125HW-C1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADC0808S250HW/C1 | ADC0808S125HW/C1,1 | ADC0808S125HW/C1:5 | ADC0808S125HW/C1:1 |
|---|---|---|---|---|---|
| Brand | Renesas | Renesas | Renesas (legacy NXP branding) | Renesas | Renesas |
| Package | 48-TQFP Exposed Pad (HTFQFP) | 48-TQFP Exposed Pad (HTFQFP) - same | 48-TQFP Exposed Pad (HTFQFP) - same | 48-TQFP Exposed Pad (HTFQFP) - same | 48-TQFP Exposed Pad (HTFQFP) - same |
| Maximum Sampling Rate | 125 MSPS | 250 MSPS (+100%) | 125 MSPS (same) | 125 MSPS (same) | 125 MSPS (same) |
| Resolution | 8 bit | 8 bit (same) | 8 bit (same) | 8 bit (same) | 8 bit (same) |
| Analog Input | Differential | Differential (same) | Differential (same) | Differential (same) | Differential (same) |
| Data Interface | Parallel LVTTL | Parallel LVTTL (same) | Parallel LVTTL (same) | Parallel LVTTL (same) | Parallel LVTTL (same) |
| Clock Interface | CMOS or LVDS selectable | CMOS or LVDS selectable (same) | CMOS or LVDS selectable (same) | CMOS or LVDS selectable (same) | CMOS or LVDS selectable (same) |
| Operating Temperature | -40C to +85C | -40C to +85C (same) | -40C to +85C (same) | -40C to +85C (same) | -40C to +85C (same) |
Key Differentiators
- Higher speed grade available in identical footprint (vs ADC0808S250HW/C1)
- Family-wide pin compatibility simplifies second-sourcing (vs ADC0808S125HW/C1,1)
- Higher resolution alternative available for dynamic-range-critical designs (vs AD9268XCPZ-125)
Design Notes
The exposed thermal pad (pin 49) MUST be soldered to a continuous, low-impedance ground plane using an array of thermal vias (typically 9-16 vias in a 3x3 or 4x4 pattern). This provides both the thermal dissipation path required to keep the junction temperature within the -40C to +85C operating range and a clean ground reference for the analog input stage. Failure to solder the exposed pad will degrade SNR by several dB and may cause thermal shutdown at full sampling rate. Place decoupling capacitors (100 nF ceramic plus 10 uF bulk) as close as possible to each AVDD and DVDD pin pair.
When using the LVDS clock input option, route the CLK_P and CLK_N traces as a 100 ohm differential pair with length matching to within 1 mm. Keep the clock traces on the top layer only - do not cross power planes or use vias. Maintain a clearance of at least 3 trace widths from the analog input traces to minimize clock-to-analog coupling. When using the CMOS clock input option, route CLK_P as a 50 ohm controlled-impedance trace and leave CLK_N floating or tied to AGND per the datasheet. Aperture jitter and resulting SNR are directly proportional to clock trace quality.
Do not leave the TEST pin floating - tie it directly to DGND. The PD (power-down) pin has an internal pull-down, but if left undriven and floating in a noisy environment it can intermittently activate, causing the output bus to go high-impedance and breaking downstream data capture. Decouple each AVDD/DVDD pin pair with both a 100 nF ceramic and a 10 uF ceramic capacitor. The differential analog input MUST be biased within the specified common-mode voltage range - a common mistake is to DC-couple an asymmetric single-ended signal without a bias network, which saturates the input stage and destroys linearity.
Estimated: At 125 MSPS with a 3.3 V supply, the ADC0808S125HW-C1 typical power dissipation is approximately 150-200 mW (input frequency and clock mode dependent). A small ferrite bead plus 100 nF capacitor on each supply pin is recommended to isolate the analog and digital domains. Split the ground plane into analog and digital sections, joining them at a single point directly under the exposed pad of the ADC. This minimizes digital switching noise coupling back into the analog input stage through the ground return path.
Compliance Information
Compliance data not available in the verified web data; see manufacturer datasheet for definitive RoHS/REACH/lead-free status. Not AEC-Q100 qualified - this is an industrial-grade part per the -40C to +85C operating temperature range.
