Texas Instruments ADS805EG4

Overview

ADS805EG4 from Texas Instruments is a 12-bit, 20MHz pipelined analog-to-digital converter (ADC) with high dynamic range for demanding signal digitization. It features 74dB SFDR at 9.8MHz input, 68dB SNR, 0.25LSB DLE, flexible 2Vp-p or 5Vp-p input range, and over-range indication - deployed in studio cameras, IF digitization, copiers, and test instrumentation.

For engineers reviewing the ADS805EG4 datasheet, ADS805EG4 pinout, ADS805EG4 application, or ADS805EG4 equivalent, key selection considerations include its 20MSPS sampling rate, SSOP-28 package, internal/external reference support, pipeline latency of 6 clock cycles, and CMOS/TTL-compatible 12-bit offset-binary outputs with OE-controlled 3-state drivers.

Technical Context

The ADS805EG4 employs a high-bandwidth track-and-hold with <4ps rms aperture jitter and 270MHz analog input bandwidth, enabling clean undersampling up to multiple Nyquist zones. Its digital error correction logic ensures no missing codes and ±0.25LSB typical differential linearity across –40°C to +85°C.

It supports programmable input ranges (1.5–3.5V standard, 0–5V optional) via SEL/VREF pin strapping, with internal 1V or 2.5V reference options or external reference mode. The OVR flag provides real-time over-range detection synchronized to the 6-cycle pipeline output.

Key Specifications

Pinout & Package

ADS805EG4 is housed in a 28-pin SSOP (DB) package with exposed pad not electrically connected. Pin layout supports single-ended or differential analog inputs, dual reference rails (REFT/REFB), common-mode bias (CM), and 3-state CMOS/TTL-compatible 12-bit parallel outputs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS805EG4, ADS804EG4 trades half the sampling rate for lower power and cost in mid-speed applications, while ADS803EG4 further reduces speed and performance for ultra-low-power embedded digitization - neither offers 20MSPS capability or 74dB SFDR, making ADS805EG4 the sole option for high-fidelity IF undersampling and studio-grade video capture.

Availability

ADS805EG4 is available at Aetrix Electronics and suitable for studio camera signal chains, IF digitization subsystems, high-speed copier image processors, and automated test equipment requiring stable component supply across extended production lifecycles.

Supply support for ADS805EG4 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 with decades of precision ADC innovation.

The ADS805EG4 belongs to TI's high-speed pipeline ADC product line, designed specifically for applications demanding wide analog bandwidth, low distortion, and deterministic latency in communications, imaging, and instrumentation systems.

FAQ

What is the maximum sampling rate supported by the ADS805EG4?

The ADS805EG4 supports a maximum sampling rate of 20 million samples per second (20 MSPS), as confirmed by its datasheet specification and timing diagram. This rate is achievable with a minimum convert clock period of 50 ns and requires low-jitter clock sources to maintain specified SNR and SFDR performance. At 20 MSPS, the ADS805EG4 delivers 68 dB SNR and 74 dB SFDR at 9.8 MHz input frequency.

Does the ADS805EG4 include an internal voltage reference?

Yes, the ADS805EG4 integrates an internal bandgap voltage reference that can be configured to output either +1 V or +2.5 V at the VREF pin, depending on the SEL pin connection. When SEL is tied to VREF, the device operates with a 2 Vp-p input range; when SEL is grounded, it uses a 5 Vp-p range. The internal reference tolerance is ±35 mV at 25°C for the 2.5 V setting.

How does the OVR (Over-Range) pin function on the ADS805EG4?

The OVR pin on the ADS805EG4 is an active-HIGH digital output that asserts when the analog input exceeds the selected full-scale range - either below REFB or above REFT. It updates synchronously with the 6-cycle pipeline output, sharing the same latency as data bits. This allows real-time monitoring and closed-loop gain control in front-end signal conditioning circuits without additional timing compensation.

What package type is used for the ADS805EG4?

The ADS805EG4 is packaged in a 28-pin SSOP (Shrink Small Outline Package), designated DB by Texas Instruments. It measures 10.2 mm × 5.3 mm with 0.65 mm lead pitch and includes three +VS pins (16, 27, 28) and two GND pins (17, 24) for optimal power integrity. The package carries RoHS-compliant NiPdAu lead finish and is rated MSL Level-2-260°C-1 Year.

Can the ADS805EG4 interface directly with 3.3V logic systems?

Yes, the ADS805EG4 supports direct interfacing with 3.3V logic through its dedicated VDRV pin (Pin 28), which supplies the digital output drivers independently from the analog +VS supply. By connecting VDRV to a 3.3V rail, the device generates TTL/CMOS-compatible output levels (VOH ≥ 2.4V, VOL ≤ 0.4V) while maintaining full analog performance with +5V on +VS pins.