Texas Instruments ADS7841EG4

Overview

ADS7841EG4 from Texas Instruments is a 12-bit, 4-channel SAR analog-to-digital converter with synchronous serial interface, ±1 LSB INL/DNL, 200 kHz max throughput at +5 V, and selectable 8-/12-bit resolution - used for precision multi-channel data acquisition in portable test equipment and battery-powered measurement systems.

For engineers reviewing the ADS7841EG4 datasheet, ADS7841EG4 pinout, ADS7841EG4 application, or ADS7841EG4 equivalent, key selection considerations include single-supply operation (2.7 V to 5 V), differential or single-ended input configuration, on-chip multiplexer, shutdown mode (<15 µW), and SSOP-16 package compatibility.

Technical Context

The ADS7841EG4 implements a capacitive redistribution SAR architecture with integrated sample-and-hold, supporting both 4-channel single-ended and 2-channel differential input modes via programmable A2–A0 and SGL/DIF control bits. Its conversion timing is synchronized to an external DCLK, requiring 15–24 clock cycles depending on resolution and power-down mode.

It uses an unbuffered external reference (100 mV to VCC) directly driving the CDAC array, with reference current scaling linearly with sample rate and reference voltage. Digital interface operates at CMOS logic levels, tolerating up to 5.5 V on inputs regardless of supply voltage.

Key Specifications

Pinout & Package

ADS7841EG4 is packaged in SSOP-16 (DBQ), a 16-pin, 0.15 mm pitch, surface-mount package measuring 4.9 mm × 3.9 mm × 1.45 mm - suitable for space-constrained PCB layouts in handheld instrumentation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-bit SAR ADC applications.

Compared with ADS7841E, the ADS7841EG4 adds lead-free/green compliance and enhanced moisture sensitivity level (MSL-3), while maintaining identical electrical behavior; versus MAX1247, it delivers tighter linearity and superior dynamic performance at the cost of slightly higher unit price.

Availability

ADS7841EG4 is available at Aetrix Electronics and suitable for portable instrumentation, industrial process monitoring, and battery-powered medical devices requiring stable component supply and long-term manufacturability.

Supply support for ADS7841EG4 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 high-reliability ICs for industrial, automotive, and communications markets.

The ADS7841 product line delivers low-power, multi-channel SAR ADCs optimized for portable and remote data acquisition - emphasizing precision, integration, and single-supply operation in harsh environments.

FAQ

What is the maximum sampling rate of the ADS7841EG4?

The ADS7841EG4 achieves up to 200 kHz conversion rate at +5 V supply and 3.2 MHz DCLK frequency. At +2.7 V, the maximum rate drops to 125 kHz due to reduced internal settling margin. This throughput supports real-time capture of audio-band and control-loop signals in portable instrumentation.

Does the ADS7841EG4 require an external reference voltage?

Yes, the ADS7841EG4 requires an external reference applied to the VREF pin. It accepts 100 mV to VCC (2.7–5.25 V), and the reference directly defines full-scale input range. No internal reference is provided - users must supply a stable, low-noise source matched to system accuracy needs.

Can the ADS7841EG4 operate in differential input mode?

Yes, the ADS7841EG4 supports true differential input using two of its four analog channels (e.g., CH0 and CH1) with the SGL/DIF bit set LOW in the control byte. The COM pin serves as the common-mode reference point, enabling rejection of shared noise in sensor interfaces.

What package type is used for the ADS7841EG4?

The ADS7841EG4 is supplied in SSOP-16 (DBQ) package - a 4.9 mm × 3.9 mm surface-mount outline with 0.15 mm lead pitch. This green, lead-free package meets JEDEC MSL-3 handling requirements and is compatible with standard reflow profiles.

How does the MODE pin affect ADS7841EG4 resolution selection?

When the MODE pin is LOW, the ADS7841EG4 always performs 12-bit conversions regardless of the MODE bit in the control byte. When MODE is HIGH, the MODE bit determines resolution: LOW = 12-bit, HIGH = 8-bit - enabling hardware-locked or software-configurable precision modes.