Texas Instruments ADS8345EB/2K5

Overview

ADS8345EB/2K5 from Texas Instruments is a 16-bit, 8-channel SAR analog-to-digital converter with synchronous serial interface, bipolar input range (±VREF), 100kHz throughput rate, and QSOP-20 package. It operates from a single 2.7V–5V supply, supports single-ended or differential input configurations, and delivers 85dB SINAD at 10kHz for precision data acquisition in portable instrumentation.

For engineers reviewing the ADS8345EB/2K5 datasheet, ADS8345EB/2K5 pinout, ADS8345EB/2K5 application, or ADS8345EB/2K5 equivalent, key selection considerations include its 6-LSB integral linearity error, ±0.024% gain error, shutdown mode (<3µA), 2.7V–5V supply flexibility, and compatibility with ADS7844/ADS8344 control protocols.

Technical Context

The ADS8345EB/2K5 implements a capacitive redistribution SAR architecture with integrated sample-and-hold, enabling true 16-bit resolution without external components. Its 8-channel multiplexer supports configurable single-ended (8 channels) or differential (4 channels) operation via SGL/DIF bit control, with COM pin referenced to VREF or system mid-supply.

It uses a 24-clock-cycle conversion protocol: 8 clocks for control byte (channel, mode, power-down), 4 for acquisition setup, and 16 for bit decisions. BUSY output signals active conversion state, while DOUT provides MSB-first two's complement data synchronized to DCLK falling edge.

Key Specifications

Pinout & Package

ADS8345EB/2K5 is housed in a 20-pin QSOP (DBQ) package with 0.65 mm pitch, optimized for compact PCB layouts and thermal performance in space-constrained embedded systems.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8344EB/2K5, the ADS8345EB/2K5 adds four extra analog inputs and differential capability-critical for scalable sensor networks. Versus ADS8325IPW, it integrates the multiplexer and reduces total solution size, though at slightly lower SNR; ideal for compact, multi-signal embedded instruments where board area and component count are constrained.

Availability

ADS8345EB/2K5 is available at Aetrix Electronics and suitable for portable data loggers, industrial process controllers, and handheld test equipment requiring stable component supply and long-term production continuity.

Supply support for ADS8345EB/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 leader specializing in analog, embedded processing, and connectivity technologies with over 90 years of innovation in precision signal chain solutions.

The ADS8345EB/2K5 belongs to TI's precision SAR ADC product line, engineered for battery-operated and space-constrained measurement systems demanding high resolution, low power, and flexible input configuration without sacrificing accuracy.

FAQ

What is the maximum conversion rate supported by the ADS8345EB/2K5?

The ADS8345EB/2K5 supports a maximum throughput rate of 100 kHz under specified conditions (VCC = 5 V, VREF = 2.5 V, fDCLK = 2.4 MHz). This rate is maintained across its full operating temperature range (–40°C to +85°C) and supply range (2.7 V to 5.25 V), enabling real-time sampling of dynamic signals in portable instrumentation and industrial monitoring systems using the ADS8345EB/2K5.

How does the ADS8345EB/2K5 handle differential versus single-ended input modes?

The ADS8345EB/2K5 selects input mode via the SGL/DIF bit in its 8-bit control byte: when HIGH, it configures CH0–CH7 as single-ended inputs referenced to the COM pin; when LOW, it pairs channels (e.g., CH0/CH4) for true differential acquisition. The ADS8345EB/2K5 maintains 16-bit resolution and 85 dB SINAD in both modes, with COM serving as common-mode reference or differential return path depending on configuration.

What is the significance of the "EB" suffix in ADS8345EB/2K5?

The "EB" suffix denotes the enhanced performance grade of the ADS8345EB/2K5, specifying tighter analog accuracy parameters: ±6 LSB integral linearity error (vs ±8 LSB for "E" grade) and ±0.024% gain error (vs ±0.05% for "E"). This grade is validated across the full –40°C to +85°C temperature range and qualifies the ADS8345EB/2K5 for high-accuracy applications such as calibrated test equipment and medical signal acquisition where measurement repeatability is critical.

Can the ADS8345EB/2K5 operate from a 3.3V supply while maintaining full specifications?

Yes-the ADS8345EB/2K5 is fully specified down to 2.7V operation. At VCC = 3.3V and VREF = 1.25V, it delivers 100 kHz throughput, 81 dB SINAD at 1 kHz, ±6 LSB INL, and 3.2 mW power dissipation. All electrical characteristics-including timing, noise, and linearity-are guaranteed across the 2.7V–3.6V sub-range, making the ADS8345EB/2K5 compatible with modern 3.3V microcontrollers and low-voltage battery systems without derating.

Does the ADS8345EB/2K5 require an external reference voltage, and what are the constraints?

Yes-the ADS8345EB/2K5 requires an external reference applied to the VREF pin, which must be between 0.5 V and VCC/2 (e.g., 0.5 V–2.5 V at 5V supply). The reference is unbuffered and draws up to 40 µA (typical), so it must be sourced from a low-impedance, low-noise supply. The ADS8345EB/2K5's input range scales directly as ±VREF, and LSB size equals VREF/65536-thus a 1.25V reference yields 19.1 µV/LSB resolution.