ADS8401IBPFBT

Analog To Digital Converters (ADC) Overview

The ADS8401IBPFBT is a 16-bit, 1.25 MSPS analog-to-digital converter (ADC) featuring a successive approximation register (SAR) architecture and a unipolar single-ended input range of 0 V to Vref. It integrates a 4.096-V internal reference with an onboard buffer. The device operates with a 5-V analog supply (+VA) and a wide digital supply (+VBD) ranging from 2.95 V to 5.25 V. Key electrical parameters include a maximum conversion time of 610 ns, a throughput rate of 1.25 MHz, and a typical power dissipation of 155 mW at full speed. It provides zero-latency data output via a high-speed parallel interface.

Analog To Digital Converters (ADC) Feature Summary

• 16-bit resolution with no missing codes ensured over the industrial temperature range
• Integrated 4.096-V reference with onboard buffer and REFIN/REFOUT pins for external reference support
• High-speed parallel interface supporting both 8-bit and 16-bit bus transfers via the BYTE pin
• Unipolar single-ended input range from 0 V to Vref with inherent sample-and-hold function

Analog To Digital Converters (ADC) Applications

• DWDM systems
• Instrumentation
• High-speed, high-resolution data acquisition systems
• Transducer interfaces
• Medical instruments

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific linearity grade required for the application. The 'I' suffix denotes ±6 LSB integral linearity, while the 'B' suffix denotes ±3.5 LSB. Ensure the ordering suffix matches the desired performance specification. Confirm package designator PFB corresponds to the 48-pin TQFP variant. Check RoHS compliance status as manufacturing processes may vary by production date.

Analog To Digital Converters (ADC) Selection Notes

Select the ADS8401IBPFBT when ±3.5 LSB integral linearity is required, as opposed to the ADS8401IPFBT which offers ±6 LSB. The device requires a 5-V analog supply and a digital supply between 2.95 V and 5.25 V. Ensure the system can accommodate the 48-lead TQFP package. Verify that the host microcontroller supports the required parallel interface timing and voltage levels for +VBD.

Analog To Digital Converters (ADC) Part Context

The ADS8401 belongs to Texas Instruments' family of micro-power sampling ADCs. It is characterized for operation over the industrial temperature range of –40°C to 85°C. The device is available in tape and reel packaging (suffix BT) with quantities of 250 units. It utilizes a capacitor-based SAR architecture for charge redistribution conversions.

Analog To Digital Converters (ADC) Replacement Considerations

Public confirmed substitute part numbers are not provided in the source documentation.

Analog To Digital Converters (ADC) FAQ

How is the internal reference configured?

When using the internal reference, connect pin 2 (REFOUT) to pin 1 (REFIN) with a 0.1 µF decoupling capacitor and place a 1 µF storage capacitor between REFOUT and REFM (pins 47/48).

What is the function of the BYTE pin?

The BYTE pin allows reading the 16-bit result on an 8-bit bus. When low, DB15–DB8 output the most significant bits. When high, the same pins output the least significant bits (D7–D0), requiring two read cycles.

What are the power supply requirements?

The analog supply (+VA) must be 5 V (range 4.75 V to 5.25 V). The digital supply (+VBD) ranges from 2.95 V to 5.25 V, with the constraint that +VBD ≥ +VA – 2.3 V.