Renesas ADC0808S250-DB

Overview

ADC0808S250-DB from Integrated Device Technology (IDT) is a differential, high-speed 8-bit analog-to-digital converter optimized for telecommunication transmission control and tape drive systems. It supports up to 250 MHz sampling, accepts LVDS or 1.8 V CMOS clock inputs, delivers 1.8 V CMOS digital outputs, and operates across −40 °C to +85 °C in an HTQFP48 package.

For engineers reviewing the ADC0808S250-DB datasheet, ADC0808S250-DB pinout, ADC0808S250-DB application, or ADC0808S250-DB equivalent, key selection criteria include its 250 MHz max sampling rate, programmable Complete Conversion Signal (CCS), differential analog input architecture, 560 MHz analog bandwidth, and flexible full-scale reference configuration via FSIN/REFSEL.

Technical Context

The ADC0808S250-DB implements a track-and-hold front-end followed by an ADC core with resistor ladder architecture, delivering only 2 clock-cycle latency. Its dual-mode clock interface (LVDS or 1.8 V CMOS) enables interoperability with diverse timing sources while maintaining signal integrity at high frequencies.

Programmable acquisition control is achieved through CCSSEL, DEL0, and DEL1 pins, allowing dynamic adjustment of the Complete Conversion Signal's frequency (f_clk or f_clk/2) and edge delay (0.3 ns to 1.9 ns). Full-scale input range is configurable via internal regulator (0.95 V CMADC, 2.0 V_p-p) or external reference (1.15–1.35 V), with dedicated FSIN/REFSEL and CMADC pins.

Key Specifications

Pinout & Package

ADC0808S250-DB is supplied in an HTQFP48 package (SOT545-2), 7 mm × 7 mm × 1 mm body with exposed die pad for thermal dissipation. Pin count: 48 leads; pin pitch: 0.5 mm.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed 8-bit ADC applications.

Compared with ADC0808S125HW-C1 and AD9280BSTZ-100, ADC0808S250-DB uniquely combines 250 MHz sampling, dual-mode clock input, and fully programmable CCS timing - making it optimal for next-generation telecom and storage systems demanding precise, low-latency data capture at maximum throughput.

Availability

ADC0808S250-DB is available at Aetrix Electronics and suitable for 2.5G/3G base station radio transceivers, optical networking line cards, and tape drive read channel designs requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for ADC0808S250-DB includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Integrated Device Technology (IDT), now part of Renesas Electronics, designs high-performance timing, memory interface, and RF solutions for communications, computing, and industrial markets.

The ADC0808S family was engineered specifically for high-speed data acquisition in telecom infrastructure and storage systems, emphasizing low-latency conversion, flexible clocking, and robust analog performance at 250 MSPS.

FAQ

What is the maximum sampling frequency supported by the ADC0808S250-DB?

The ADC0808S250-DB supports a maximum sampling frequency of 250 MHz, as confirmed in the datasheet's Dynamic Characteristics table (f_clk(max) = 250 MHz). This enables digitization of analog signals with bandwidths up to 125 MHz under Nyquist criteria. The device maintains specified INL (±0.82 LSB), THD (−53 dB), and SNR (47 dBc) at this rate, making ADC0808S250-DB suitable for demanding IF sampling applications in wireless infrastructure.

Does the ADC0808S250-DB support both LVDS and CMOS clock inputs?

Yes, the ADC0808S250-DB supports both LVDS and 1.8 V CMOS clock inputs on the same CLK+/CLK− pins. Selection is controlled by the CLKSEL pin: HIGH or unconnected enables LVDS mode (differential 825–1575 mV), while LOW configures 1.8 V CMOS mode (single-ended, rising-edge triggered, CLK− grounded). This dual-mode capability is explicitly documented in Table 4 and Section 7.1 of the ADC0808S250-DB datasheet.

How is the full-scale input range configured on the ADC0808S250-DB?

The full-scale input range of the ADC0808S250-DB is configured via the FSIN/REFSEL pin. Grounding FSIN/REFSEL enables the internal 1.25 V reference, yielding a 2.0 V_p-p differential input range with 0.95 V common-mode output on CMADC. Applying 1.15 V, 1.25 V, or 1.35 V to FSIN/REFSEL selects corresponding external references, scaling Vi(p-p)(max) to 1.825 V, 1.99 V, or 2.16 V respectively - all verified in Table 9 and Section 7.5 of the ADC0808S250-DB datasheet.

What is the function of the CCS pin on the ADC0808S250-DB?

The CCS (Complete Conversion Signal) pin on the ADC0808S250-DB is a programmable output strobe used to synchronize external logic (e.g., FPGA or ASIC) with valid data on D0–D7. Its frequency (f_clk or f_clk/2) is selected by CCSSEL, and its edge delay (0.3 ns, 0.8 ns, or 1.9 ns) is set by DEL0/DEL1 - enabling precise alignment within the stable data window. This eliminates need for external timing generation, as detailed in Section 7.4 and Table 7 of the ADC0808S250-DB datasheet.

What package type is used for the ADC0808S250-DB?

The ADC0808S250-DB is supplied in an HTQFP48 package (SOT545-2), a plastic thermal enhanced thin quad flat package with 48 leads, 7 mm × 7 mm × 1 mm body, 0.5 mm pitch, and an exposed die pad for thermal dissipation. This mechanical outline is confirmed in Section 4 (Ordering Information), Section 13 (Package Outline), and Figure 12 of the ADC0808S250-DB datasheet.