Texas Instruments ADS1602IPFBT

Overview

ADS1602IPFBT from Texas Instruments is a 16-bit, 2.5MSPS delta-sigma analog-to-digital converter with 91dB SNR at 100kHz input, –101dB THD, and 103dB SFDR. It features an on-chip 16× decimation FIR filter, ±3V differential input range, and operates from –40°C to +85°C in sonar and vibration analysis systems.

For engineers reviewing the ADS1602IPFBT datasheet, ADS1602IPFBT pinout, ADS1602IPFBT application, or ADS1602IPFBT equivalent, key selection criteria include its 1.23MHz –3dB bandwidth, 40MHz clock input support, 530mW power dissipation at full speed, internal/external reference flexibility, and simultaneous sampling capability across multiple units.

Technical Context

The ADS1602IPFBT employs a stable 2-1-1 multi-stage delta-sigma modulator sampling at up to 40MSPS, followed by a linear-phase 4-stage half-band FIR decimation filter delivering 75dB stopband attenuation and ±0.001dB passband ripple. Its architecture inherently reduces clock jitter sensitivity by 4× versus Nyquist ADCs.

It supports direct connection to TMS320 DSPs via a high-speed 3-wire serial interface (SCLK, DOUT, FSO), with dedicated SYNC for multi-device synchronization and OTR for out-of-range detection. Analog and digital supplies are fully separated (AVDD/DVDD/IOVDD), and bias current is set externally via RBIAS.

Key Specifications

Pinout & Package

The ADS1602IPFBT is housed in a 7mm × 7mm TQFP-48 package with exposed thermal pad (PFB suffix), compatible with standard reflow profiles and offering low thermal resistance for sustained high-speed operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS1672IPAPR and AD9269BCPZ-80, the ADS1602IPFBT uniquely balances 2.5MSPS speed, 91dB SNR, on-chip FIR filtering, and hardware synchronization - making it optimal for industrial vibration monitoring and sonar where both bandwidth and fidelity are non-negotiable.

Availability

ADS1602IPFBT is available at Aetrix Electronics and suitable for sonar signal processing, vibration analysis systems, and high-fidelity data acquisition front ends requiring stable component supply across extended production cycles.

Supply support for ADS1602IPFBT 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, embedded processing, and connectivity technologies, with decades of expertise in precision data converters.

The ADS1602IPFBT belongs to TI's high-speed precision delta-sigma ADC product line, engineered specifically for demanding measurement applications where wide bandwidth, low distortion, and deterministic synchronization are essential.

FAQ

What is the maximum clock frequency supported by the ADS1602IPFBT?

The ADS1602IPFBT accepts a maximum CLK input frequency of 40MHz, which drives its internal modulator at 40MSPS and enables the full 2.5MSPS output data rate. Operation at lower clock frequencies (e.g., 20MHz) proportionally reduces power consumption via the RBIAS-controlled bias current, while maintaining functional integrity.

Does the ADS1602IPFBT require external antialiasing filtering?

The ADS1602IPFBT integrates a 16× decimation FIR filter with 38.6MHz stopband and 75dB attenuation, eliminating the need for external analog antialiasing filters up to its 1.23MHz –3dB bandwidth. Only a simple RC anti-imaging filter is recommended at the analog inputs to suppress aliasing from frequencies above 38.6MHz.

How does the OTR pin function on the ADS1602IPFBT?

The OTR (Out-of-Range) pin on the ADS1602IPFBT is an open-drain digital output that asserts high whenever the absolute value of the differential input (|AINP – AINN|) exceeds the reference voltage magnitude (|VREFP – VREFN|). This provides immediate hardware-level saturation detection without software polling, critical for real-time protection in closed-loop systems.

Can the ADS1602IPFBT operate with an external reference voltage?

Yes - the ADS1602IPFBT supports both internal and external reference configurations. When REFEN is low, it uses its internal 3V reference (±50ppm/°C drift); when REFEN is high, it accepts an external differential reference between 2V and 3.25V applied to VREFP and VREFN, enabling system-level reference sharing and improved accuracy.

What is the purpose of the RBIAS pin on the ADS1602IPFBT?

The RBIAS pin on the ADS1602IPFBT connects to an external resistor (typically 37kΩ) that sets the analog bias current and directly scales power dissipation. Reducing RBIAS lowers current and power linearly - e.g., increasing RBIAS to 100kΩ cuts AVDD current by ~30% - allowing dynamic trade-offs between speed, noise, and thermal budget without changing firmware or layout.