Texas Instruments ADS7800KUG4

Overview

ADS7800KUG4 from Texas Instruments is a 12-bit successive-approximation analog-to-digital converter (SAR ADC) with integrated sample/hold, internal ±2V reference, clock, and three-state parallel outputs. It delivers 333kSPS throughput, ±10V/±5V bipolar input ranges, 72dB SNR, and 80dB SFDR over temperature - used in precision data acquisition systems for industrial process control and automated test equipment.

For engineers reviewing the ADS7800KUG4 datasheet, ADS7800KUG4 pinout, ADS7800KUG4 application, or ADS7800KUG4 equivalent, key selection considerations include its 3µs max total acquisition + conversion time, ±1/2 LSB integral linearity, internal reference output (pin 3), dual ±5V/+5V power supply architecture (pins 22–24), and HBE-controlled 12-bit or 8-bit/4-bit parallel data interface.

Technical Context

The ADS7800KUG4 employs a charge-redistribution SAR architecture with laser-trimmed thin-film scaling resistors to support precise ±10V or ±5V bipolar input ranges. Its internal 2V reference (±5% tolerance, 10µA source capability) feeds a stable comparator and DAC array, enabling guaranteed no-missing-codes performance across –40°C to +85°C.

Conversion is initiated by a falling edge on R/C (pin 19) under active CS (pin 20) and HBE (pin 18) low conditions. BUSY (pin 21) asserts low for 2.7µs max during conversion, then rises to signal data validity - enabling synchronous readout via TTL/CMOS-compatible three-state outputs with 13ns aperture delay and 150ps rms jitter.

Key Specifications

Pinout & Package

ADS7800KUG4 is housed in a 24-pin Small Outline Integrated Circuit (SOIC) package with 300-mil width, gull-wing leads, and RoHS-compliant lead finish. Pin 1 is marked by a beveled corner; pin 13 (DGND) and pin 4 (AGND) must be connected externally to maintain analog/digital ground separation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7804U and MAX1166BCPP, ADS7800KUG4 uniquely combines ±10V/±5V bipolar input flexibility, integrated reference and clock, and 333kSPS parallel throughput - making it irreplaceable in legacy industrial DAQ systems requiring drop-in compatibility and minimal external component count.

Availability

ADS7800KUG4 is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, motor drive current sensing, and medical instrumentation requiring stable component supply across extended temperature ranges.

Supply support for ADS7800KUG4 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 connectivity technologies, with decades of expertise in precision data converters and industrial-grade ICs.

The ADS7800KUG4 belongs to TI's legacy high-speed precision SAR ADC product line, designed specifically for demanding industrial and instrumentation applications requiring guaranteed DC accuracy, robust AC performance, and long-term reliability in harsh environments.

FAQ

What is the maximum sampling rate supported by the ADS7800KUG4?

The ADS7800KUG4 is specified for a maximum throughput rate of 333kSPS at full 12-bit resolution. This is achieved with a guaranteed maximum total acquisition + conversion time of 3.0µs over the full operating temperature range (–40°C to +85°C). The internal factory-trimmed clock ensures consistent timing without external adjustment, and the BUSY output provides precise synchronization for data readout in both Convert and Read modes.

Does the ADS7800KUG4 require an external reference voltage?

No, the ADS7800KUG4 does not require an external reference voltage because it includes an internal +2V reference (pin 3) with ±5% initial accuracy and 10µA source capability. This reference is used internally for the DAC and comparator. While pin 3 can be bypassed with a 22–47µF tantalum capacitor to improve stability, it is not intended to drive external circuitry - any external reference use requires buffering per the datasheet guidance.

How is the input range selected between ±10V and ±5V on the ADS7800KUG4?

The ADS7800KUG4 selects input range via physical connection: connect the analog signal to pin 1 (IN1) and ground pin 2 (IN2) for ±10V operation; or connect to pin 2 (IN2) and ground pin 1 (IN1) for ±5V operation. The internal laser-trimmed scaling resistors automatically configure the front-end gain - no register writes or configuration bits are needed. Input impedance is 6.3kΩ (±10V) or 4.2kΩ (±5V), requiring low-source-impedance signal conditioning.

What power supply voltages does the ADS7800KUG4 require?

The ADS7800KUG4 requires three supply rails: +5V applied to both VSA (pin 24) and VSD (pin 23), which must be shorted externally and bypassed together; and a negative supply of either –12V or –15V applied to –VS (pin 22). The +5V supplies power the analog and digital sections separately to minimize noise coupling, while the negative rail enables bipolar input signal handling. Total power dissipation is ≤215mW.

Can the ADS7800KUG4 interface directly with an 8-bit microprocessor bus?

Yes, the ADS7800KUG4 supports direct 8-bit bus interfacing using the HBE (High-Byte Enable, pin 18) control. When HBE is held HIGH, the four most significant bits (MSBs) appear on pins 14–17, while pins 9–12 output LOW - enabling two-byte reads. When HBE is LOW, all 12 bits are presented in parallel on D0–D11. All digital inputs and outputs are TTL/CMOS-compatible, and the three-state drivers allow shared bus operation without external buffers.