Texas Instruments ADS1605IPAPR

Overview

ADS1605IPAPR from Texas Instruments is a 16-bit, 5MSPS delta-sigma analog-to-digital converter (ADC) with linear-phase digital filtering, ±0.0025dB passband ripple up to 2.2MHz, and 88dB SNR at 100kHz. It operates from +5V analog and +3V digital supplies, supports selectable on-chip reference, and directly interfaces to TMS320C6000 DSPs via parallel 16-bit output. Used in high-fidelity data acquisition for medical imaging and vibration analysis.

For engineers reviewing the ADS1605IPAPR datasheet, ADS1605IPAPR pinout, ADS1605IPAPR application, or ADS1605IPAPR equivalent, key selection criteria include its 2.45MHz −3dB bandwidth, 101dB SFDR at −6dBFS, adjustable power dissipation (315–570mW), 2X mode enabling 10MSPS operation, and compatibility with external or internal voltage references.

Technical Context

The ADS1605IPAPR employs a stable 2-1-1 pipelined delta-sigma modulator sampling at 40MSPS (fCLK = 40MHz), decimated by a low-ripple linear-phase FIR filter to deliver 5MSPS output with 2.45MHz signal bandwidth. Its architecture enables high linearity without calibration, supporting −99dB THD and 88dB SNR at 100kHz input.

It features differential analog inputs (AINP/AINN), programmable reference selection (REFEN), 2X mode control (doubling data rate), and power-down (PD) functionality. Unlike the ADS1606, it lacks FIFO logic-FIFO_LEV[2:0] pins are NC-and shares identical analog/digital performance, package, and timing with ADS1606 except for FIFO-related circuitry.

Key Specifications

Pinout & Package

ADS1605IPAPR is housed in a thermally enhanced HTQFP-64 PowerPAD™ package (PAP), with exposed thermal pad soldered to PCB ground plane for optimal thermal performance (θJA = 25°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS1606IPAPR, ADS1605IPAPR offers identical performance without FIFO overhead-reducing latency and simplifying timing-but lacks burst capture capability. Compared with ADS1625IPAPR, it trades 2 bits of resolution for 4× higher throughput, making it optimal for dynamic signal analysis where temporal fidelity outweighs static accuracy.

Availability

ADS1605IPAPR is available at Aetrix Electronics and suitable for scientific instrumentation, automated test equipment, and medical imaging systems requiring stable component supply, long-term manufacturability, and TI-qualified industrial-grade reliability.

Supply support for ADS1605IPAPR 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 high-performance data conversion technologies.

The ADS1605IPAPR belongs to TI's precision delta-sigma ADC product line, engineered for demanding measurement applications where wide bandwidth, low distortion, and high SNR are critical-particularly in test, medical, and scientific domains.

FAQ

What is the maximum clock frequency supported by ADS1605IPAPR?

The ADS1605IPAPR supports a maximum CLK frequency of 50MHz, with typical operation at 40MHz. At 40MHz, it achieves 5MSPS output (or 10MSPS in 2X mode). Exceeding 50MHz violates absolute maximum ratings and may cause timing violations or increased jitter-induced SNR degradation. The ADS1605IPAPR datasheet specifies t2 (CLK pulse width) ≥10ns, confirming 50MHz (20ns period) as the hard limit.

Does ADS1605IPAPR include an integrated FIFO buffer?

No, the ADS1605IPAPR does not include an integrated FIFO buffer. FIFO_LEV[2:0] pins are marked "NC" (not connected) and must be left unconnected. The FIFO feature is exclusive to the ADS1606IPAPR variant. This makes ADS1605IPAPR ideal for low-latency, continuous streaming applications where deterministic timing is prioritized over burst capture flexibility.

What reference voltage options are available for ADS1605IPAPR?

The ADS1605IPAPR supports both internal and external reference configurations. With REFEN = low, it uses an internal 3V reference (VREFP ≈ 4.0V, VREFN ≈ 1.0V, VMID ≈ 2.5V). With REFEN = high, it accepts an external differential reference of 2.5–3.2V applied to VREFP/VREFN. Internal reference drift is 50ppm/°C; external reference choice affects overall system gain error and temperature stability.

How does power dissipation vary with operating conditions in ADS1605IPAPR?

ADS1605IPAPR power dissipation ranges from 315mW to 570mW depending on REFEN state, RBIAS value, and clock frequency. With REFEN = high and RBIAS = 37kΩ at 40MHz, typical dissipation is 570mW. Reducing RBIAS increases analog current (IAVDD), raising power; disabling internal reference (REFEN = high) lowers IAVDD by ~25mA. In PD mode, dissipation drops to 5mW.

Is ADS1605IPAPR pin-compatible with ADS1606IPAPR?

Yes, ADS1605IPAPR and ADS1606IPAPR are fully pin-compatible in the HTQFP-64 (PAP) package. All signal, power, and ground pins occupy identical locations. The only difference is functional: FIFO_LEV[2:0] pins are NC on ADS1605IPAPR but active outputs on ADS1606IPAPR. No PCB redesign is needed when migrating between them, though firmware must ignore FIFO pins when using ADS1605IPAPR.