Texas Instruments ADS8406IBPFBR

Overview

ADS8406IBPFBR 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, parallel 16-/8-bit interface, and zero-latency operation. It delivers ±1 LSB DNL max, 90 dB SNR at 100 kHz, and operates from single 5-V analog supply in industrial temperature range (–40°C to +85°C). Used in high-precision data acquisition for medical instruments and transducer interfaces.

For engineers reviewing the ADS8406IBPFBR datasheet, ADS8406IBPFBR pinout, ADS8406IBPFBR application, or ADS8406IBPFBR equivalent, key selection considerations include its pseudo-bipolar input range (–2 V to +2 V), 650 ns conversion time, 2.7–5.25 V I/O supply flexibility, and compatibility with microcontroller parallel bus read cycles using BYTE/CS/RD control signals.

Technical Context

The ADS8406IBPFBR implements a capacitor-based successive approximation register (SAR) architecture with inherent sample-and-hold, generating its own internal conversion clock-no external clock required. Its pseudo-bipolar fully differential input accepts ±2 V span referenced to internal 4.096-V reference, with input common-mode range of –0.2 V to VREF + 0.2 V.

Conversion is triggered by falling edge of CONVST while CS is low; BUSY asserts high during conversion and falls low upon completion. Data is output in two's complement format on DB[15:0], configurable via BYTE pin for 16-bit or dual 8-bit reads, with 3-state drivers enabling direct connection to shared digital buses.

Key Specifications

Pinout & Package

The ADS8406IBPFBR is housed in a 48-pin TQFP (PFB) package with exposed thermal pad, rated for industrial temperature range (–40°C to +85°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8406IBPFBR, ADS8412IPFBT offers higher throughput at the expense of linearity, while ADS8402IPFBR trades speed and power for simpler thermal management - all three share identical parallel interface timing and pin mapping, easing migration within the same PCB footprint.

Availability

ADS8406IBPFBR is available at Aetrix Electronics and suitable for medical instrumentation, transducer interface, and high-speed data acquisition systems requiring stable component supply, long-term manufacturability, and industrial temperature support.

Supply support for ADS8406IBPFBR 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 delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, precision, and system-level integration.

The ADS8406IBPFBR belongs to TI's high-speed SAR ADC product line, designed specifically for applications demanding high resolution, low latency, and robust DC accuracy in industrial and medical data acquisition environments.

FAQ

What is the input voltage range supported by the ADS8406IBPFBR?

The ADS8406IBPFBR supports a pseudo-bipolar fully differential input range of –2 V to +2 V (span = –VREF to +VREF), with individual +IN and –IN pins operating from –0.2 V to VREF + 0.2 V (i.e., –0.2 V to 4.296 V) when using the internal 4.096-V reference. This range is confirmed in the Absolute Maximum Ratings and Specifications tables of the SLAS426A datasheet.

Does the ADS8406IBPFBR require an external clock source?

No, the ADS8406IBPFBR does not require an external clock. It uses an internally generated conversion clock that enables its 1.25 MSPS throughput rate. The device starts conversion on the falling edge of CONVST, and timing parameters such as conversion time (650 ns) and acquisition time (150 ns) are derived from this internal oscillator - no external clock input or configuration is needed.

How does the BYTE pin affect data readout on the ADS8406IBPFBR?

The BYTE pin on the ADS8406IBPFBR configures the parallel data bus for either 16-bit or dual 8-bit read operations. When BYTE = 0, DB[15:0] outputs the full 16-bit result. When BYTE = 1, the first read cycle places D[7:0] on DB[15:8], and the second places D[15:8] on DB[15:8] - enabling compatibility with 8-bit microcontrollers. This behavior is defined in the Terminal Functions and Timing Diagrams sections of the ADS8406IBPFBR datasheet.

Can the ADS8406IBPFBR operate with an external reference voltage?

Yes, the ADS8406IBPFBR supports external reference voltages from 2.5 V to 4.2 V applied to the REFIN pin. When using an external reference, REFOUT is left floating and REFM serves as the reference ground. The internal 4.096-V reference is disabled automatically. This mode is validated in the SPECIFICATIONS section under "EXTERNAL VOLTAGE REFERENCE INPUT" and Figure 32 of the datasheet.

What is the power dissipation of the ADS8406IBPFBR at maximum throughput?

The ADS8406IBPFBR dissipates 155 mW typical and 170 mW maximum at 1.25 MSPS with +VA = 5 V and +VBD = 5 V, as specified in the POWER SUPPLY REQUIREMENTS table. This includes only +VA current (34 mA typ); +VBD current is ~1 mA separately. Thermal impedance θJA is 86°C/W, resulting in ~13°C rise above ambient under typical conditions - verified in the ABSOLUTE MAXIMUM RATINGS and SPECIFICATIONS sections.