Texas Instruments ADS8406IPFBR

Overview

ADS8406IPFBR from Texas Instruments is a 16-bit, 1.25 MSPS pseudo-bipolar fully differential SAR analog-to-digital converter with internal 4.096-V reference, 90 dB SNR at 100 kHz, ±2 LSB INL max, and parallel 16-/8-bit interface - used in high-precision data acquisition for medical instruments and communications infrastructure.

For engineers reviewing the ADS8406IPFBR datasheet, ADS8406IPFBR pinout, ADS8406IPFBR application, or ADS8406IPFBR equivalent, this page delivers verified timing parameters (650 ns conversion time), true differential input range (–V_REF to +V_REF), power specs (155 mW at 1.25 MHz), package mapping (48-pin TQFP), and confirmed alternative parts for design continuity.

Technical Context

The ADS8406IPFBR implements a capacitor-based successive approximation register (SAR) architecture with inherent sample-and-hold, generating its own conversion clock - eliminating external clock dependency. It supports zero-latency operation via synchronous CONVST-triggered sampling and BUSY-driven read coordination.

Its pseudo-bipolar fully differential input accepts ±4 V span (with 4.096-V reference), while internal double-buffered reference enables stable operation with or without external REFIN. The 16-bit two's complement output is delivered via CMOS-compatible parallel bus with BYTE-selectable 8-bit mode and 3-state drivers.

Key Specifications

Pinout & Package

ADS8406IPFBR is housed in a 48-pin TQFP (PFB) package with exposed thermal pad, rated for –40°C to +85°C operation. Pin functions are validated per TI SLAS426A datasheet Rev. December 2004.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed SAR ADC applications.

Compared with ADS8406IPFBR, ADS8412IPFBR offers higher speed at increased power and thermal load, while ADS8402IPFBR trades throughput and dynamic range for lower power and cost - all three share identical pinout, reference architecture, and interface protocol.

Availability

ADS8406IPFBR is available at Aetrix Electronics and suitable for medical instrumentation, communications infrastructure, high-precision data acquisition, and transducer interface systems requiring stable component supply across extended product lifecycles.

Supply support for ADS8406IPFBR 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 signal chain solutions.

The ADS8406IPFBR belongs to TI's high-speed SAR ADC family designed for applications demanding zero-latency, high linearity, and integrated reference - targeting instrumentation, medical, and communications markets where accuracy and timing determinism are critical.

FAQ

What is the maximum sampling rate supported by the ADS8406IPFBR?

The ADS8406IPFBR supports a maximum throughput rate of 1.25 MSPS, achieved with a 650 ns conversion time and 150 ns acquisition period. This rate is guaranteed over the full industrial temperature range (–40°C to +85°C) and requires proper timing alignment of CONVST, BUSY, and RD/CS signals per the datasheet timing diagrams.

Does the ADS8406IPFBR require an external clock source?

No, the ADS8406IPFBR does not require an external clock. It uses an internally generated conversion clock, enabling autonomous operation with only CONVST triggering. This eliminates clock distribution challenges and jitter sensitivity in high-SNR applications - a key feature confirmed in the PRINCIPLES OF OPERATION section of the SLAS426A datasheet.

How is the internal 4.096-V reference configured on the ADS8406IPFBR?

To use the internal reference on the ADS8406IPFBR, connect REFOUT (Pin 2) to REFIN (Pin 1) with a 0.1-µF decoupling capacitor, and place a 1-µF storage capacitor between REFOUT and REFM (Pins 47–48). This configuration activates the double-buffered internal reference, which starts up in 120 ms and delivers 4.096 V ±0.75% with 36 ppm/°C drift.

Can the ADS8406IPFBR interface directly with an 8-bit microcontroller?

Yes, the ADS8406IPFBR supports 8-bit bus interfacing via the BYTE pin. When BYTE = 1, the lower byte (D[7:0]) appears on DB[15:8] during the second read cycle - enabling seamless connection to 8-bit MCUs without external latches or address demultiplexing. Timing must observe tsu4 (50 ns BYTE transition setup) and td3 (2–30 ns data valid delay) per the datasheet.

What are the absolute voltage limits for the +IN and –IN pins on the ADS8406IPFBR?

The +IN and –IN pins on the ADS8406IPFBR have absolute voltage limits of –0.4 V to (+VA + 0.1 V), where +VA is the analog supply (typically 5 V). Their differential input span is limited to –V_REF to +V_REF (±4.096 V), and each input must stay within –0.2 V to (V_REF + 0.2 V) to maintain specified linearity - exceeding these ranges risks INL/DNL degradation.