Texas Instruments ADS803E

Overview

ADS803E from Texas Instruments is a 12-bit, 5 MSPS pipelined analog-to-digital converter optimized for high-dynamic-range signal acquisition in IF/baseband and imaging systems. It delivers 82 dB SFDR at Nyquist, 69 dB SNR, ±0.25 LSB DLE, 270 MHz track-mode bandwidth, and features an over-range indicator flag. It operates with internal 1.0 V or 2.5 V reference, supports 2 V_p-p or 5 V_p-p input ranges, and is used in CCD scanners and test instrumentation.

For engineers reviewing the ADS803E datasheet, ADS803E pinout, ADS803E application, or ADS803E equivalent, key selection considerations include its 5 MSPS sampling rate, 270 MHz analog input bandwidth, 6 ns data latency, CMOS/TTL-compatible 3-state outputs, and SSOP-28 package compatibility with ADS804/ADS805 for design scalability.

Technical Context

The ADS803E employs a multi-stage pipelined architecture with integrated track-and-hold, digital error correction, and programmable reference ladder. Its high-bandwidth linear T&H minimizes harmonic distortion and aperture jitter (4 ps rms), enabling 69 dB SNR at 2.48 MHz input.

Digital output timing is synchronized to the rising edge of CLK with 6-clock-cycle latency; outputs are driven by a separate VDRV supply (3 V to 5 V) for logic-level flexibility. The OVR flag updates concurrently with conversion data, indicating input voltage exceeding REFT or falling below REFB.

Key Specifications

Pinout & Package

The ADS803E is housed in a 28-pin SSOP (DB) package with exposed pad not electrically connected. Pin spacing is 0.65 mm; body dimensions are 10.2 mm × 5.3 mm × 1.95 mm (max height). Thermal resistance θ_JA = 50°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed, 12-bit ADC applications.

Compared with ADS804E and ADS805E, the ADS803E provides optimal balance of 5 MSPS throughput, 115 mW power, and 82 dB SFDR - making it ideal for cost-sensitive, thermally constrained IF and imaging systems where 10+ MSPS is unnecessary.

Availability

ADS803E is available at Aetrix Electronics and suitable for IF digitization, CCD imaging scanners, and portable test instrumentation requiring stable component supply through extended production lifecycles.

Supply support for ADS803E 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and high-performance data converters for industrial, automotive, and communications markets.

The ADS803E belongs to TI's high-speed precision ADC product line, designed specifically for demanding IF, imaging, and instrumentation applications requiring >65 dB SNR and <0.5 LSB linearity at multi-MSPS rates.

FAQ

What is the maximum sampling rate supported by the ADS803E?

The ADS803E supports a maximum sampling rate of 5 MSPS, as confirmed in its Electrical Characteristics table under "Sample Rate" (TYP = 5M Samples/s). This rate is fixed and cannot be exceeded without violating AC performance specifications such as SNR and SFDR. At this rate, the device achieves 69 dB SNR and 82 dB SFDR at 2.48 MHz input frequency, with 6 clock-cycle data latency. Operation above 5 MSPS is not characterized or guaranteed.

Does the ADS803E require an external reference voltage?

No, the ADS803E does not require an external reference voltage. It integrates a bandgap reference capable of generating either 1.0 V or 2.5 V outputs, selectable via the SEL pin strap configuration. When SEL is tied to VREF, the device operates in 2 V_p-p input range mode using the 1.0 V reference; when SEL is grounded, it uses the 2.5 V reference for 5 V_p-p range. External reference operation is optional and enabled only when SEL is connected to +VS.

How is the over-range indicator (OVR) pin used in system design?

The OVR pin on the ADS803E is an active-HIGH digital flag that asserts when the analog input exceeds the full-scale range defined by REFT and REFB. It updates synchronously with the digitized output data after the same 6-clock latency. In system design, OVR is commonly used to trigger automatic gain control (AGC) circuits - for example, reducing front-end amplifier gain upon OVR assertion to prevent clipping. Its timing alignment with data enables reliable real-time signal integrity monitoring in CCD scanners and test equipment.

Can the ADS803E interface directly with 3.3 V logic systems?

Yes, the ADS803E can interface directly with 3.3 V logic systems using its dedicated VDRV pin (Pin 28). By supplying 3.3 V to VDRV while maintaining +5 V on +VS, the digital outputs (B1–B12) produce TTL/CMOS-compatible voltage levels: VOH ≥ 2.4 V and VOL ≤ 0.4 V at I_OH/I_OL = 0.5 mA/1.6 mA. This eliminates the need for external level shifters or bus buffers, simplifying interconnect to 3.3 V FPGAs or microcontrollers while preserving noise isolation between analog and digital domains.

What package type and thermal characteristics apply to the ADS803E?

The ADS803E is packaged in a 28-pin SSOP (DB) with 0.65 mm pitch and dimensions of 10.2 mm × 5.3 mm × 1.95 mm. Its thermal resistance is θ_JA = 50°C/W under standard JEDEC conditions. The package has no exposed thermal pad, so heat dissipation relies on copper pour and vias under the body. At 115 mW nominal power, junction temperature rise above ambient is ~5.8°C - well within the +150°C absolute maximum rating, supporting reliable operation in industrial environments up to +85°C ambient.