Texas Instruments ADS8324E/2K5

Overview

ADS8324E/2K5 from Texas Instruments is a 14-bit, 50kHz sampling SAR analog-to-digital converter operating from a 1.8V supply, featuring differential bipolar input, SPI/SSI-compatible serial interface, and reference voltage range of 500mV to VCC/2. It delivers ±3 LSB integral linearity error and consumes only 2.5mW at 1.8V, making it suitable for portable data acquisition and isolated sensor interfaces.

For engineers reviewing the ADS8324E/2K5 datasheet, ADS8324E/2K5 pinout, ADS8324E/2K5 application, or ADS8324E/2K5 equivalent, key selection considerations include its micro-power operation at 1.8V, MSOP-8 package compatibility with ADS7817, differential input architecture, and guaranteed no-missing-codes performance across –40°C to +85°C.

Technical Context

The ADS8324E/2K5 implements a capacitive redistribution SAR architecture fabricated in 0.6μm CMOS, integrating sample-and-hold functionality. It requires an external reference (500mV–VCC/2), external clock (24kHz–1.2MHz), and single 1.8V supply-no internal reference or oscillator is included.

Its digital interface uses a 3-wire synchronous serial protocol: CS/SHDN initiates conversion and controls shutdown, DCLOCK synchronizes bit transfer on falling edges, and DOUT outputs 16-bit two's complement data (MSB-first) with one null bit followed by two dummy zeros, enabling direct connection to microcontrollers without level-shifting.

Key Specifications

Pinout & Package

ADS8324E/2K5 is housed in an MSOP-8 (VSSOP DGK) package, 3.0 mm × 3.0 mm × 1.0 mm, with exposed pad not electrically connected. Pin assignments are validated per TI SBAS172A datasheet Rev. March 2004.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar analog-to-digital conversion applications.

Compared with ADS7817E/250, ADS8324E/2K5 provides 4× more codes and lower power at 1.8V; compared with ADS8325IDRCT, it trades 2-bit resolution and tighter INL for proven MSOP-8 compatibility and lower system integration risk.

Availability

ADS8324E/2K5 is available at Aetrix Electronics and suitable for portable battery-powered DAQ, isolated sensor interface, and remote industrial node applications requiring stable component supply and long-term lifecycle support.

Supply support for ADS8324E/2K5 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 company specializing in analog and embedded processing technologies, with decades of leadership in precision data converters and low-power design.

The ADS8324E/2K5 belongs to TI's precision SAR ADC product line, engineered for ultra-low-power, high-resolution data acquisition in space- and energy-constrained systems such as handheld test equipment and distributed sensors.

FAQ

What is the maximum sampling rate supported by the ADS8324E/2K5?

The ADS8324E/2K5 supports a maximum sampling rate of 50 kHz at 1.8 V supply, corresponding to a minimum conversion cycle time of 20 μs. This rate is achieved with a 1.2 MHz DCLOCK input and requires 22–24 clock cycles per conversion, including sampling and serial output phases. Performance remains specified across the full –40°C to +85°C temperature range.

Does the ADS8324E/2K5 include an internal voltage reference?

No, the ADS8324E/2K5 requires an external reference voltage applied to the VREF pin. The reference must be set between 500 mV and VCC/2 (i.e., 0.9 V max at 1.8 V supply). TI recommends bypassing VREF with a 0.1 μF ceramic capacitor placed close to the pin to maintain stability and minimize noise-induced errors in the ADS8324E/2K5 conversion results.

Is the ADS8324E/2K5 pin-compatible with other Texas Instruments ADCs?

Yes, the ADS8324E/2K5 is explicitly pin-compatible with the 12-bit ADS7817 in the MSOP-8 package. Pin functions-including VREF, +In, –In, GND, CS/SHDN, DOUT, DCLOCK, and +VCC-are identical, enabling direct replacement without PCB modification. However, firmware must be updated to handle the 14-bit two's complement output format of the ADS8324E/2K5.

What is the power consumption of the ADS8324E/2K5 at 10 kHz sampling rate?

At a 10 kHz sampling rate and 1.8 V supply, the ADS8324E/2K5 achieves average power dissipation of less than 1 mW. This is accomplished by spending most of its time in power-down mode between conversions-enabled automatically after conversion completion and fully enforced when CS/SHDN is held HIGH. Quiescent current drops to ≤3 μA under full shutdown.

Can the ADS8324E/2K5 interface directly with a 3.3 V microcontroller SPI port?

Yes, the ADS8324E/2K5 DOUT pin outputs CMOS logic levels swinging from 0 V to VCC (1.8 V), so direct connection to a 3.3 V MCU SPI input is not recommended without level translation. While the ADS8324E/2K5 inputs tolerate up to 6 V, its 1.8 V output may fall below the VIH threshold of many 3.3 V MCUs. A simple resistive divider or dedicated level shifter ensures reliable communication with the ADS8324E/2K5.