Texas Instruments ADS7824PB

Overview

ADS7824PB from Burr-Brown is a 12-bit, 4-channel sampling CMOS analog-to-digital converter with ±10V input range, internal +2.5V reference, and parallel/serial microprocessor interface. It achieves 25µs max complete conversion cycle, ±0.5 LSB max INL/DNL, and operates from single +5V supply across –40°C to +85°C. It is used in industrial data acquisition systems requiring multiplexed analog channel digitization with low power and high linearity.

For engineers reviewing the ADS7824PB datasheet, ADS7824PB pinout, ADS7824PB application, or ADS7824PB equivalent, this page delivers verified technical context, package mapping, functional pin roles, real-world use cases, and validated alternative parts - all grounded in the official Burr-Brown PDS-1303B datasheet and product documentation.

Technical Context

The ADS7824PB implements a successive approximation register (SAR) architecture with integrated sample-and-hold, four-channel analog multiplexer, and laser-trimmed scaling resistors for ±10V input range and ±0.1% channel-to-channel matching. Its dual output mode supports parallel (8-bit MSB/LSB via BYTE control) or serial (12-bit MSB-first on SDATA with internal or external DATACLK) data transfer.

It supports continuous conversion mode (CONTC = HIGH) cycling through AIN0–AIN3, and features power-down (PWRD = HIGH) reducing dissipation to 50µW. Internal reference drift is ±5 ppm/°C, and full-scale error is ±0.25% with internal reference.

Key Specifications

Pinout & Package

ADS7824PB is housed in a 28-pin plastic DIP (0.3" wide), package drawing number 246, with thermal resistance θ_JA = 75°C/W. Pin assignments are electrically and mechanically identical to ADS7824P.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-bit, 4-channel SAR ADC applications.

Compared with ADS7824P and ADS7824UB, the ADS7824PB offers identical performance to the UB variant but in a rugged, hand-solderable DIP package - making it ideal for industrial test fixtures, legacy system upgrades, and applications requiring mechanical serviceability without rework risk.

Availability

ADS7824PB is available at Aetrix Electronics and suitable for industrial process monitoring, test equipment development, motor control feedback systems, and programmable logic controller I/O modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADS7824PB 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 was a U.S.-based analog semiconductor pioneer, acquired by Texas Instruments in 2000. Known for precision data converters, op-amps, and interface ICs.

The ADS7824PB belongs to Burr-Brown's industrial SAR ADC family designed for high-accuracy, multi-channel data acquisition in harsh environments - emphasizing low drift, channel matching, and flexible digital interfacing.

FAQ

What is the maximum sampling rate supported by the ADS7824PB?

The ADS7824PB achieves a maximum throughput rate of 40 kHz, corresponding to a complete acquisition-and-conversion cycle of 25 µs. This is measured under standard conditions: TA = –40°C to +85°C, VS = +5V ±5%, and using the internal reference. The device maintains ±0.5 LSB INL/DNL at this rate, making it suitable for real-time industrial monitoring applications where timing determinism is critical.

Does the ADS7824PB require an external reference voltage?

No, the ADS7824PB includes a laser-trimmed internal +2.5V reference with ±0.25% initial accuracy and ±5 ppm/°C drift, eliminating the need for an external reference in most applications. However, REF can also accept an external 2.3V–2.7V source if higher precision or custom scaling is required - in which case the external reference must be buffered to maintain linearity specifications.

How does the continuous conversion mode work on the ADS7824PB?

When CONTC is driven HIGH, the ADS7824PB automatically cycles through AIN0 → AIN1 → AIN2 → AIN3 repeatedly, performing conversions without host intervention. Each channel conversion completes in 25 µs, enabling a sustained 10 kHz per-channel sampling rate. BUSY remains LOW during the entire sequence and rises only after the fourth channel's data is latched - allowing synchronous readout of all four results.

Can the ADS7824PB interface directly with a microcontroller using only three wires?

Yes - in serial mode (PAR/SER = LOW), the ADS7824PB uses SDATA, DATACLK (configured as output when EXT/INT = LOW), and BUSY for full-duplex communication. With internal clocking, only three connections are needed: SDATA (output), DATACLK (output), and BUSY (output). No handshake or additional control lines are required, simplifying integration with resource-constrained MCUs.

What is the purpose of the TAG pin on the ADS7824PB?

The TAG pin (D0 in serial mode) accepts serial input bits synchronized to the same DATACLK used for SDATA output. Each rising/falling edge clocks one bit into the device. This feature enables bidirectional serial communication - for example, sending calibration coefficients or channel configuration data back to the ADC while reading converted values - without requiring additional GPIOs or protocol overhead.