Texas Instruments ADS8344EB/2K5

Overview

ADS8344EB/2K5 from Texas Instruments is a 16-bit, 8-channel SAR analog-to-digital converter with synchronous serial interface, ±0.024% gain error, 84 dB SINAD, and 100 kHz throughput rate. It operates from a single 2.7V–5V supply, supports single-ended or differential input configurations, and features on-chip multiplexer and shutdown mode for battery-powered data acquisition systems.

For engineers reviewing the ADS8344EB/2K5 datasheet, ADS8344EB/2K5 pinout, ADS8344EB/2K5 application, or ADS8344EB/2K5 equivalent, key selection considerations include its QSOP-20 package, 16-bit resolution with guaranteed no missing codes up to 15 bits, internal/external clock flexibility, and low 5 mW typical power dissipation at 100 kHz under +2.7V operation.

Technical Context

The ADS8344EB/2K5 implements a capacitive redistribution SAR architecture with integrated sample-and-hold, enabling precise 16-bit conversion without external hold circuitry. Its 8-channel analog multiplexer supports both single-ended (8 channels referenced to COM) and differential (4 channel pairs) modes, controlled via three address bits (A2–A0) and SGL/DIF bit in the 24-bit serial control word.

Digital interface uses a 4-wire CMOS-compatible serial protocol (CS, DCLK, DIN, DOUT) with BUSY indicator and tri-state outputs. Clocking supports two modes: external clock (f_DCLK = 24 × f_SAMPLE) or internal clock (2.4 MHz), with programmable power-down between conversions via PD1/PD0 bits - reducing supply current to 3 µA in auto-shutdown mode.

Key Specifications

Pinout & Package

ADS8344EB/2K5 is packaged in QSOP-20 (DBQ), a 20-pin, 0.65 mm pitch, surface-mount plastic package measuring 7.2 mm × 4.4 mm × 1.75 mm, optimized for space-constrained industrial and portable applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8344N/1K and ADS8343EB/2K5, the ADS8344EB/2K5 delivers highest gain accuracy among pin-compatible variants and uniquely supports 8-channel scanning - making it optimal for uncalibrated multi-sensor systems requiring long-term stability without per-unit trimming.

Availability

ADS8344EB/2K5 is available at Aetrix Electronics and suitable for data acquisition, portable test equipment, and industrial process control applications requiring stable component supply, long-lifecycle assurance, and consistent parametric performance across production batches.

Supply support for ADS8344EB/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 and embedded processing technologies, with decades of expertise in precision data converters and industrial-grade signal chain solutions.

The ADS8344EB/2K5 belongs to TI's precision SAR ADC product line, designed specifically for high-resolution, low-power, multi-channel measurement in portable and harsh-environment applications - emphasizing accuracy retention over temperature and supply variation.

FAQ

What is the maximum sampling rate supported by the ADS8344EB/2K5?

The ADS8344EB/2K5 supports a maximum throughput rate of 100 kHz, corresponding to a minimum conversion time of 10 µs. This is achieved using an external clock frequency of 2.4 MHz (24 × f_SAMPLE). At lower rates, the device maintains full 16-bit performance and can operate down to DC with no minimum sampling constraint. The ADS8344EB/2K5 achieves this rate while consuming only 5 mW at +2.7 V.

Does the ADS8344EB/2K5 require an external reference voltage?

Yes, the ADS8344EB/2K5 requires an external reference voltage applied to the VREF pin. It accepts any stable voltage from 0.5 V to +VCC, and the full-scale input range is 0 V to VREF in single-ended mode. The reference is unbuffered and directly drives the internal CDAC, so low-noise, low-output-impedance sources (e.g., REF5025) are recommended - especially below 2.5 V, where LSB size shrinks and noise sensitivity increases. The ADS8344EB/2K5 does not include an internal reference.

How does the ADS8344EB/2K5 handle differential versus single-ended inputs?

The ADS8344EB/2K5 supports both configurations via the SGL/DIF control bit in the serial command word. In single-ended mode (SGL/DIF = HIGH), each of CH0–CH7 is measured relative to the COM pin. In differential mode (SGL/DIF = LOW), four pairs are available: CH0–CH1, CH2–CH3, CH4–CH5, CH6–CH7. The ADS8344EB/2K5 provides 100 dB channel-to-channel isolation and maintains 16-bit linearity in both modes, with COM serving as the common-mode reference point in either case.

What power-saving features does the ADS8344EB/2K5 offer for battery-operated designs?

The ADS8344EB/2K5 offers three power-saving mechanisms: (1) SHDN pin for hardware shutdown (<15 µW), (2) programmable auto power-down between conversions (3 µA quiescent), and (3) internal clock mode that decouples conversion timing from host processor clock. At 100 kHz throughput and +2.7 V, typical power dissipation is 5 mW - dropping to <1 µW in full shutdown. These features make the ADS8344EB/2K5 ideal for long-life battery-powered data loggers and portable instrumentation.

Is the ADS8344EB/2K5 pin-compatible with other devices in the ADS834x family?

Yes, the ADS8344EB/2K5 is pin-compatible with ADS8344E, ADS8344N, ADS8344NB, and ADS8343x variants in the same QSOP-20 or SSOP-20 packages. All share identical pin functions, electrical timing, and serial command structure. The ADS8344EB/2K5 differs only in guaranteed gain error (±0.024%) and temperature-tested performance - allowing drop-in replacement where higher accuracy is required without layout or firmware changes.