Texas Instruments ADS7824UB/1KG4

Overview

ADS7824UB/1KG4 from Burr-Brown (now Texas Instruments) is a 12-bit, 4-channel CMOS sampling analog-to-digital converter with ±10V input range, successive approximation architecture, and dual parallel/serial digital interface. It delivers ±0.5 LSB INL/DNL, 25 µs max complete cycle time, and operates from a single +5V supply. It is used in industrial data acquisition systems requiring multiplexed precision measurement of bipolar sensor signals.

For engineers reviewing the ADS7824UB/1KG4 datasheet, ADS7824UB/1KG4 pinout, ADS7824UB/1KG4 application, or ADS7824UB/1KG4 equivalent, key selection considerations include its SOIC-28 package, internal 2.5V reference with ±0.5% full-scale error, continuous conversion mode for sequenced channel scanning, and tri-state parallel output with byte-select capability for 12-bit data handling.

Technical Context

The ADS7824UB/1KG4 integrates a 4-channel analog multiplexer, track-and-hold amplifier, 12-bit SAR ADC core, internal 2.5V reference, and configurable parallel/serial interface logic. Its laser-trimmed resistor network ensures ±0.1% channel-to-channel gain matching and supports ±10V differential input range without external scaling.

It supports three operational modes: single-shot (via CS/R/C), continuous conversion (CONTC = HIGH), and power-down (PWRD = HIGH). The serial interface uses either internal clock (DATACLK output, EXT/INT = LOW) or external clock (DATACLK input, EXT/INT = HIGH), with SYNC pulse and TAG input for synchronized data tagging.

Key Specifications

Pinout & Package

ADS7824UB/1KG4 is housed in a 28-pin SOIC package (JEDEC MS-012AC, 217 drawing), specified for –40°C to +85°C operation. Pin pitch is 1.27 mm; body width is 7.5 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7824U and ADS8320IDGSR, ADS7824UB/1KG4 uniquely combines 12-bit ±0.5 LSB accuracy, 4-channel MUX, internal reference, and dual parallel/serial interface in a single SOIC-28 package - making it optimal for space-constrained, multi-sensor industrial controllers needing guaranteed monotonicity and minimal BOM count.

Availability

ADS7824UB/1KG4 is available at Aetrix Electronics and suitable for industrial process monitoring, test equipment design, motor drive current sensing, and medical instrumentation requiring stable component supply across extended temperature ranges.

Supply support for ADS7824UB/1KG4 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

Burr-Brown Corporation, acquired by Texas Instruments in 2000, specialized in high-precision analog ICs including data converters, amplifiers, and references for industrial and instrumentation markets.

The ADS7824UB/1KG4 belongs to Burr-Brown's legacy 12-bit sampling ADC family, designed specifically for embedded industrial data acquisition systems demanding integrated multiplexing, internal reference, and flexible microprocessor interfacing in compact packages.

FAQ

What is the maximum sampling rate achievable with ADS7824UB/1KG4 in continuous conversion mode?

The ADS7824UB/1KG4 achieves a 40 kHz aggregate throughput rate in continuous conversion mode. Because it cycles through four channels (AIN0–AIN3), this yields an effective 10 kSPS per channel. This rate is sustained across the full –40°C to +85°C industrial temperature range and assumes proper decoupling and timing compliance per the datasheet.

Does ADS7824UB/1KG4 require an external reference, or can it operate with its internal 2.5V reference?

ADS7824UB/1KG4 can operate fully with its internal 2.5V reference - no external reference is required. The internal reference is trimmed to ±0.5% full-scale error and must be bypassed with a 2.2µF tantalum capacitor from CAP to AGND2. External reference is optional and supported within 2.3V–2.7V for improved stability in high-accuracy systems.

How does the BYTE pin function during parallel data readout of ADS7824UB/1KG4?

When PAR/SER = HIGH, the BYTE pin selects which portion of the 12-bit result appears on D0–D7: LOW presents the 8 MSBs (D7–D0 = bits 11–4), and HIGH presents the 4 LSBs (D3–D0 = bits 3–0). This allows 8-bit microcontrollers to read the full result in two consecutive bus cycles without bit-shifting overhead.

Can ADS7824UB/1KG4 interface directly with a 3.3V microcontroller in parallel mode?

No - ADS7824UB/1KG4 is a +5V-only device: its digital outputs swing from 0V to VS (min +4.75V, typ +5V), and inputs require VIH ≥ +2.4V. Direct connection to 3.3V logic risks violating VOH/VIL thresholds and may cause bus contention. Level translation (e.g., TXB0108) or 5V-tolerant MCU I/O is required.

What is the purpose of the TAG pin on ADS7824UB/1KG4, and how is it used?

The TAG pin on ADS7824UB/1KG4 is a serial data input synchronized to the DATACLK signal (internal or external). Each rising/falling edge clocks one bit into the device, and that bit appears on SDATA 13–15 clock edges later. It enables time-stamped or metadata-tagged acquisition - e.g., associating each ADC sample with a sensor ID or event flag in systems using external clocking.