Texas Instruments ADS7816U/2K5G4

Overview

ADS7816U/2K5G4 from Burr-Brown (now Texas Instruments) is a 12-bit, 200kHz sampling SAR analog-to-digital converter with differential input, synchronous serial interface, and programmable reference voltage (100mV–5V). It delivers 1.22mV LSB resolution at 5V reference, 1.9mW power at full rate, and 3µA shutdown current-enabling high-precision, low-power data acquisition in space-constrained battery-operated systems.

For engineers reviewing the ADS7816U/2K5G4 datasheet, ADS7816U/2K5G4 pinout, ADS7816U/2K5G4 application, or ADS7816U/2K5G4 equivalent, key selection considerations include its 8-pin SOIC package, CMOS-compatible serial timing, differential input rejection capability, micro-power operation across 12.5kHz–200kHz sample rates, and reference-voltage-dependent ENOB degradation.

Technical Context

The ADS7816U/2K5G4 implements a capacitive redistribution successive approximation register (SAR) architecture on 0.6µm CMOS, integrating sample-and-hold functionality. Conversion is initiated by CS/SHDN falling edge, with analog input sampled over 1.5 clock cycles before 12-cycle conversion completes.

Digital output appears serially on DOUT, MSB-first, synchronized to DCLOCK falling edges-starting after one null bit and requiring no pipeline delay. Reference current scales with sample rate and code value (e.g., 38–100µA at 200kHz), while analog input leakage remains ≤±1µA and input capacitance is 25pF.

Key Specifications

Pinout & Package

ADS7816U/2K5G4 is housed in an 8-lead SOIC package (Package Drawing 182), with gull-wing leads, 1.27mm pitch, and standard JEDEC MS-012AC outline.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7816U/2K5G4, ADS7816UB offers improved linearity at identical power and interface behavior, while ADS7822U trades reference programmability for integrated simplicity-making ADS7816U/2K5G4 optimal when adaptive full-scale scaling or ultra-low-noise external references are required.

Availability

ADS7816U/2K5G4 is available at Aetrix Electronics and suitable for battery-operated systems, remote data acquisition nodes, and isolated sensor interfaces requiring stable component supply across extended product lifecycles.

Supply support for ADS7816U/2K5G4 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

Burr-Brown Corporation, acquired by Texas Instruments in 2000, specialized in high-precision analog signal conditioning ICs for industrial, instrumentation, and medical applications.

The ADS7816U/2K5G4 belongs to Burr-Brown's micro-power SAR ADC family, designed specifically for portable and distributed data acquisition where low quiescent current, small footprint, and flexible reference scaling are essential.

FAQ

What is the maximum sampling rate supported by the ADS7816U/2K5G4?

The ADS7816U/2K5G4 supports a maximum sampling rate of 200kHz, achieved with a 3.2MHz DCLOCK frequency (16× oversampling ratio). At this rate, it consumes 1.9mW and delivers 72dB SINAD. Lower rates-including 12.5kHz-are fully supported and reduce power proportionally to 150µW, enabling flexible trade-offs between speed, resolution, and energy use in the ADS7816U/2K5G4 design.

Does the ADS7816U/2K5G4 require an external reference voltage?

Yes, the ADS7816U/2K5G4 requires an external reference voltage applied to the VREF pin. It accepts 100mV to 5V, directly setting the full-scale input range and LSB size (e.g., 1.22mV at 5V, 24µV at 100mV). The reference must be low-noise and well-bypassed (0.1µF ceramic), as the ADS7816U/2K5G4 provides no internal reference and exhibits no inherent PSRR on the VREF line.

What package type is used for the ADS7816U/2K5G4?

The ADS7816U/2K5G4 is supplied in an 8-lead SOIC package (JEDEC MS-012AC, drawing number 182), with 1.27mm lead pitch and gull-wing surface-mount leads. This package is pin-compatible with the ADS7816P (PDIP) and ADS7816E (MSOP) variants, though thermal and parasitic characteristics differ-SOIC offers balanced performance for automated assembly and moderate thermal dissipation in the ADS7816U/2K5G4 implementation.

How does the differential input of the ADS7816U/2K5G4 function in practice?

The ADS7816U/2K5G4 differential input uses +In and –In pins to capture the voltage difference, with –In limited to ±200mV relative to local ground. Unlike pseudo-differential converters, the –In voltage is sampled once and held-enabling true differential acquisition for remote ground sensing. In practice, –In connects to the signal source's local ground to reject small potential differences, while +In carries the sensed analog signal, preserving integrity in noisy or isolated environments for the ADS7816U/2K5G4.

Can the ADS7816U/2K5G4 be powered down between conversions to save energy?

Yes, the ADS7816U/2K5G4 supports two power-down modes: automatic post-conversion sleep (reducing current to ~30µA at 12.5kHz) and full shutdown via CS/SHDN HIGH (3µA max). Holding CS HIGH disables both analog and digital sections completely. This feature is essential for battery-powered applications, allowing the ADS7816U/2K5G4 to achieve ultra-low average power when paired with burst-mode sampling strategies and precise timing control.