Texas Instruments ADC3641IRSBR

Overview

ADC3641IRSBR from Texas Instruments is a 14-bit, dual-channel, 10-MSPS analog-to-digital converter optimized for low-noise, ultra-low-power operation in industrial and instrumentation systems. It delivers –155 dBFS/Hz noise spectral density, ±0.6 LSB INL, 79.0 dBFS SNR at 5 MHz input, and 1-clock-cycle latency with single 1.8-V supply - enabling high-precision data acquisition in thermal imaging and power quality monitoring.

For engineers reviewing the ADC3641IRSBR datasheet, ADC3641IRSBR pinout, ADC3641IRSBR application, or ADC3641IRSBR equivalent, this page provides verified specifications, validated package mapping, confirmed dual-channel timing behavior, real-world spectral performance at 10 MSPS, and two technically documented alternative parts for design flexibility.

Technical Context

The ADC3641IRSBR implements a fully differential pipeline architecture with on-chip 1.6-V reference support and configurable external reference input (VREF/REFBUF). Its analog front-end supports 900-MHz input bandwidth and 0.95-V common-mode output (VCM), while digital outputs use DDR CMOS or serialized CMOS interfaces with programmable decimation (×2 to ×32) and 32-bit NCO.

It operates across –40°C to +105°C with 29 mW/channel power consumption at 10 MSPS, scaling linearly with sample rate. Latency is fixed at one sampling clock cycle for DDR CMOS mode, and it supports hardware reset (RESET), synchronization (PDN/SYNC), and SPI configuration via SCLK/SDIO/SEN pins.

Key Specifications

Pinout & Package

The ADC3641IRSBR is housed in a 40-pin VQFN (RSB) package measuring 5.00 mm × 5.00 mm with exposed thermal pad. Pin functions are validated per TI SBAS886A Rev. A (May 2022).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel, 14-bit, low-power ADC applications.

Compared with ADC3642IRSBR, the ADC3641IRSBR trades 15-MSPS headroom for 30% lower power and tighter thermal envelope; versus ADS131M04IPBSR, it delivers 1000× higher sample rate and true AC-coupled wideband performance but lacks on-chip PGA and diagnostics.

Availability

ADC3641IRSBR is available at Aetrix Electronics and suitable for thermal imaging sensor interfaces, power quality analyzers, and high-speed industrial control loops requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for ADC3641IRSBR 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 signal chains.

The ADC364x family was designed specifically for low-power, high-fidelity dual-channel digitization in space- and energy-constrained industrial systems - balancing noise performance, latency, and thermal efficiency without sacrificing DC or AC accuracy.

FAQ

What is the maximum input frequency supported by the ADC3641IRSBR analog front-end?

The ADC3641IRSBR analog input bandwidth is specified at 900 MHz (–3 dB), enabling faithful digitization of signals up to Nyquist (5 MHz at 10 MSPS) with minimal amplitude roll-off. This bandwidth supports clean sampling of harmonics and fast transients in power quality and control applications, and is validated across the full –40°C to +105°C temperature range per SBAS886A.

Does the ADC3641IRSBR require an external reference, or can it operate with its internal reference?

The ADC3641IRSBR supports both internal and external reference configurations. Its internal 1.6-V bandgap reference is enabled by default and requires no external components; alternatively, a 1.6-V external reference can be applied to VREF, or a 1.2-V source to REFBUF for improved stability. Reference selection is configured via SPI register settings, and both options are fully characterized across temperature.

How does the power consumption of ADC3641IRSBR scale with sampling rate?

ADC3641IRSBR power scales linearly: 29 mW per channel at 10 MSPS, rising to 72 mW per channel at 65 MSPS. At its rated 10 MSPS, total typical power is 58 mW (27 mA AVDD + 5 mA IOVDD), making it among the lowest-power 14-bit dual ADCs in its class - ideal for thermally constrained or battery-operated systems where ADC3641IRSBR is deployed.

Is the ADC3641IRSBR pin-compatible with other members of the ADC364x family?

Yes, ADC3641IRSBR is pin-to-pin compatible with ADC3642IRSBR and ADC3643IRSBR in the same 40-pin VQFN (RSB) package. All share identical pin functions, power domains, and interface signaling - allowing hardware reuse across speed grades. Firmware must be updated to match the target device's timing and register map, but PCB layout and passive components remain unchanged.

What digital interface modes does the ADC3641IRSBR support, and how do they affect latency?

ADC3641IRSBR supports DDR CMOS (1-cycle latency), serialized 2-wire CMOS (2-cycle latency), and serialized 1-wire/1/2-wire CMOS (1-cycle latency). DDR mode uses all DAx/DBx pins for parallel output; serialized modes reduce pin count using DCLKIN and time-multiplexed data on DA1/DB1. Latency values are fixed per mode and documented in Section 6.10 of the ADC3641IRSBR datasheet.