Texas Instruments ADS8325IDGKTG4

Overview

ADS8325IDGKTG4 from Texas Instruments is a 16-bit, SAR analog-to-digital converter with differential input, SPI/SSI-compatible serial interface, and microPower operation (4.5 mW at 100 kSPS, 1 mW at 10 kSPS). It supports 2.7V–5.5V supply, 2.5V–VDD reference, ±1.5 LSB typical INL, and 100 kSPS throughput - used in isolated data acquisition, battery-powered instrumentation, and multi-channel remote sensing.

For engineers reviewing the ADS8325IDGKTG4 datasheet, ADS8325IDGKTG4 pinout, ADS8325IDGKTG4 application, or ADS8325IDGKTG4 equivalent, key selection criteria include differential input range compliance, 16-bit no-missing-codes performance, MSOP-8 thermal pad handling, power-down current (0.2 µA at 5 V), and SPI timing compatibility with host microcontrollers.

Technical Context

The ADS8325IDGKTG4 implements a capacitive redistribution SAR architecture with integrated sample-and-hold, enabling single-cycle 100 kSPS conversion without pipeline delay. Its differential analog front-end accepts inputs from –0.3 V to +0.5 V on –IN and up to VDD + 0.3 V on +IN, with full-scale range defined by external reference voltage (2.5 V to VDD).

It uses a synchronous serial interface with CS/SHDN controlling chip select and shutdown modes, DCLOCK synchronizing 16-bit MSB-first data transfer, and DOUT providing real-time conversion results. The device achieves 14.7 ENOB at 1 kHz with 5 VPP input and maintains ±1.5 LSB INL across –40°C to +85°C.

Key Specifications

Pinout & Package

ADS8325IDGKTG4 is packaged in an 8-pin MSOP (DGK) with exposed thermal pad. The pad is internally connected to substrate and may be tied to analog ground or left floating - must be isolated from digital ground.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit SAR ADC applications.

Compared with ADS8325IDGKTG4, ADS8326IDGKT trades external reference flexibility for integration and reduced BOM count, while ADS8322IBDRBT offers improved linearity and compact packaging at the cost of layout change - both require validation of timing margins and thermal pad implementation.

Availability

ADS8325IDGKTG4 is available at Aetrix Electronics and suitable for battery-operated instrumentation, isolated data acquisition, and remote multi-channel sensing requiring stable component supply, long-term lifecycle support, and traceable TI-sourced inventory.

Supply support for ADS8325IDGKTG4 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 delivering analog and embedded processing solutions with leadership in data converters, power management, and interface ICs.

The ADS8325IDGKTG4 belongs to TI's precision SAR ADC product line, designed for high-resolution, low-power data acquisition in portable, isolated, and distributed sensing systems.

FAQ

What is the maximum clock frequency supported by ADS8325IDGKTG4?

The ADS8325IDGKTG4 supports a DCLOCK frequency range of 24 kHz to 2.4 MHz. At 2.4 MHz, it achieves its full 100 kSPS throughput with 24 clock cycles per conversion. Minimum high/low pulse widths are 200 ns when VDD ≥ 4.75 V. Exceeding 2.4 MHz violates timing specifications and risks data corruption in the ADS8325IDGKTG4 serial output stream.

Does ADS8325IDGKTG4 require an external reference voltage?

Yes, ADS8325IDGKTG4 requires an external reference voltage applied to the REF pin. It accepts 2.5 V to VDD (2.7 V–5.5 V), and the reference directly defines full-scale range and LSB size. No internal reference is present - omitting the external reference will result in undefined conversion results in the ADS8325IDGKTG4.

Can ADS8325IDGKTG4 operate from a 3.3 V supply?

Yes, ADS8325IDGKTG4 is fully specified for 2.7 V–5.5 V operation. At 3.3 V, it draws 0.75–1.5 mA, delivers 13.9 ENOB at 1 kHz, and supports 4 kHz full-power bandwidth. Reference voltage must be ≤3.3 V (e.g., 2.5 V or 3.0 V), and digital interface complies with LVCMOS levels - confirmed in ADS8325IDGKTG4 electrical characteristics tables.

What is the function of the thermal pad on the MSOP-8 package of ADS8325IDGKTG4?

The exposed thermal pad on the ADS8325IDGKTG4 MSOP-8 (DGK) package is internally connected to the silicon substrate. TI recommends connecting it to analog ground for optimal thermal and noise performance, but it may be left floating. It must be kept separate from digital ground to prevent noise coupling - a critical layout requirement for achieving specified 14.7 ENOB in the ADS8325IDGKTG4.

How does the CS/SHDN pin control power states in ADS8325IDGKTG4?

In ADS8325IDGKTG4, CS/SHDN is a dual-function pin: pulled low to enable conversion and serial data transfer; driven high to enter shutdown mode with 0.2 µA supply current and 3-state DOUT. No separate shutdown command is needed - the pin directly controls both chip select and power state, simplifying interface logic in low-duty-cycle data loggers using ADS8325IDGKTG4.