Texas Instruments ADS7841EB/2K5

Overview

ADS7841EB/2K5 from Texas Instruments is a 12-bit, 4-channel SAR analog-to-digital converter with synchronous serial interface, ±1 LSB INL/DNL accuracy, 200 kHz max throughput at +5 V, and selectable 8-/12-bit resolution-designed for precision data acquisition in battery-powered portable instrumentation.

For engineers reviewing the ADS7841EB/2K5 datasheet, ADS7841EB/2K5 pinout, ADS7841EB/2K5 application, or ADS7841EB/2K5 equivalent, key selection factors include single-supply operation (2.7–5 V), SSOP-16 package, differential/single-ended input flexibility, shutdown mode (<15 µW), and compatibility with isolated serial interfaces in remote sensing systems.

Technical Context

The ADS7841EB/2K5 implements a capacitive redistribution SAR architecture with integrated sample-and-hold, supporting both 4-channel single-ended and 2-channel differential input configurations via programmable A2–A0 and SGL/DIF control bits. Its conversion timing is synchronized to an external DCLK, requiring 15–24 clock cycles per conversion depending on resolution and power mode.

It features a dedicated MODE pin that forces 12-bit operation regardless of the MODE bit in the control byte, and uses a non-buffered VREF input (100 mV to VCC) directly driving the CDAC array-making reference stability and layout critical for LSB-level accuracy at low VREF.

Key Specifications

Pinout & Package

ADS7841EB/2K5 is packaged in a 16-pin SSOP (DBQ) with 0.65 mm pitch, footprint-compatible with ADS7841E/2K5 but specified to tighter ±1 LSB INL/DNL performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7841E/2K5 and MAX1247ACPP+, the ADS7841EB/2K5 delivers superior linearity (±1 LSB) in a space-efficient SSOP-16 package while retaining identical serial protocol and control register mapping-making it the optimal upgrade path for existing ADS7841E designs requiring higher accuracy without layout changes.

Availability

ADS7841EB/2K5 is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor interfaces, and medical vital sign monitors requiring stable component supply and guaranteed long-term availability.

Supply support for ADS7841EB/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 low-power system solutions.

The ADS7841 product line was engineered for portable, multi-channel data acquisition systems demanding high accuracy, low power, and flexible input configuration-all within a compact, single-supply IC.

FAQ

What is the maximum sampling rate of the ADS7841EB/2K5 and under what conditions?

The ADS7841EB/2K5 achieves up to 200 kHz throughput at +5 V supply, VREF = +5 V, and fCLK = 3.2 MHz (16 clocks per conversion). At +2.7 V, the maximum rate drops to 125 kHz due to internal timing constraints. The device supports 15-clock mode (up to 213 kHz) only with FPGA/ASIC controllers-not standard microcontroller SPI peripherals.

Does the ADS7841EB/2K5 require an external reference, and what voltage range is supported?

Yes, the ADS7841EB/2K5 requires an external unbuffered reference applied to the VREF pin, supporting 100 mV to +VCC. With VREF = 2.5 V, LSB = 610 µV; with VREF = 5 V, LSB = 1.22 mV. Reference current varies with sample rate (e.g., ~13 µA at 125 kHz), necessitating a low-noise, well-bypassed source.

How does the MODE pin affect resolution selection in the ADS7841EB/2K5?

When the MODE pin is held LOW, the ADS7841EB/2K5 always performs 12-bit conversions regardless of the MODE bit in the control byte-simplifying firmware and ensuring consistent resolution. When MODE = HIGH, the MODE bit determines resolution: LOW = 12-bit, HIGH = 8-bit, enabling dynamic speed/precision trade-offs.

Can the ADS7841EB/2K5 perform differential measurements, and how is this configured?

Yes, the ADS7841EB/2K5 supports true differential input using any two of CH0–CH3 (e.g., CH0–CH1) by setting SGL/DIF = LOW and selecting appropriate A2–A0 bits in the control byte. The internal multiplexer routes +IN and –IN to the SAR core, providing rejection of common-mode noise up to 120 dB at 50 kHz.

What power-saving modes does the ADS7841EB/2K5 support, and how much current do they draw?

The ADS7841EB/2K5 offers three power states: full operation (~900 µA at +5 V), auto power-down (PD1=PD0=0, ~3 µA between conversions), and hardware shutdown (SHDN = LOW, <15 µW). Shutdown mode eliminates dynamic current entirely, making it ideal for wake-on-event architectures in battery-powered ADS7841EB/2K5 systems.