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Texas Instruments ADS1626IPAPR
- Part No.:
- ADS1626IPAPR
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 64-PowerTQFP
- Datasheet:
-
ADS1626IPAPR.pdf
- Description:
- IC ADC 18BIT SIGMA-DELTA 64HTQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,152
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Product details
Overview
ADS1626IPAPR from Texas Instruments is an 18-bit, 1.25MSPS delta-sigma analog-to-digital converter (ADC) with on-chip FIFO, ±0.0025dB passband ripple, 93dB SNR, and −101dB THD. It operates from +5V analog and +3V digital supplies, supports direct TMS320C6000 DSP interfacing, and targets high-fidelity data acquisition in vibration analysis and medical imaging systems.
For engineers reviewing the ADS1626IPAPR datasheet, ADS1626IPAPR pinout, ADS1626IPAPR application, or ADS1626IPAPR equivalent, key selection considerations include its 615kHz bandwidth, adjustable power dissipation (150–515mW), FIFO_LEV[2:0] programmable output buffer, selectable internal/external reference, and TQFP-64 PowerPAD™ package compatibility with industrial temperature range (−40°C to +85°C).
Technical Context
The ADS1626IPAPR employs a stable 2-1-1 pipelined delta-sigma modulator sampling at 40MSPS, decimated by a linear-phase digital filter to deliver 1.25MSPS output with 615kHz −3dB bandwidth and ±0.0025dB passband ripple up to 550kHz. Its differential input architecture measures AINP–AINN against VREFP–VREFN, supporting full-scale inputs of ±1.467VREF.
It features dual-supply operation (AVDD = +5V, DVDD/IOVDD = +3V/+2.7V to +5.25V), analog power controlled via RBIAS resistor, and dedicated out-of-range (OTR) monitoring. The ADS1626IPAPR uniquely includes FIFO_LEV[2:0] pins for configuring FIFO depth-absent in the ADS1625-enabling flexible data buffering for burst-mode acquisition.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit - delivers 262,144 distinct output codes for high dynamic range measurement |
| Data Rate | 1.25MSPS - enables real-time capture of signals up to 615kHz bandwidth with Nyquist compliance |
| SNR | 93dB - corresponds to ~15.5 effective bits (ENOB) at 10kHz, critical for low-noise instrumentation |
| THD | −101dB - ensures minimal harmonic contamination in precision spectral analysis applications |
| SFDR | 103dB - guarantees clean detection of small signals adjacent to large interferers (e.g., in MRI front-ends) |
| Passband Ripple | ±0.0025dB - preserves amplitude fidelity across 0–550kHz, essential for calibrated metrology |
| Supply Voltages | AVDD = +5V, DVDD = +3V, IOVDD = +2.7V to +5.25V - supports mixed-voltage system integration with FPGA/DSPs |
Pinout & Package
ADS1626IPAPR is housed in a thermally enhanced HTQFP-64 (PAP) package with TI PowerPAD™ technology, featuring 64 leads and exposed thermal pad for efficient heat dissipation in high-power ADC operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AINP / AINN | Differential analog input | Accepts ±1.467VREF full-scale differential signal; requires matched routing and common-mode bias at 2.0V |
| VREFP / VREFN | Reference voltage terminals | Supports internal (REFEN = low) or external 2.5–3.2V reference; defines ADC full-scale range |
| DOUT[17:0] | Parallel digital output bus | 18-bit MSB-first parallel interface; directly connects to TMS320C6000 EMIF without level-shifting |
| FIFO_LEV[2:0] | FIFO depth configuration | 3-pin binary input setting FIFO buffer level (1–8 words); unique to ADS1626IPAPR vs ADS1625 |
| PD | Power-down control | Active-low input disabling all circuitry; reduces power to 5mW for standby in battery-sensitive systems |
| DRDY | Data-ready indicator | Active-low pulse synchronized to CLK falling edge; signals valid DOUT[17:0] for synchronous read timing |
| RBIAS | Analog bias current control | External resistor sets AVDD current (85–135mA), enabling dynamic power scaling from 150–515mW |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable FIFO output buffer | Configurable 1–8-word depth via FIFO_LEV[2:0], eliminating host processor bottlenecks during high-rate burst acquisition |
| Selectably enabled on-chip reference | Internal 3.0V reference (50ppm/°C drift) activated by pulling REFEN low; eliminates external reference component count |
| Direct TMS320C6000 DSP interface | Parallel 18-bit DOUT[17:0] with DRDY/CS/RD timing compliant with C6000 EMIF, reducing interface logic and PCB area |
| Wide digital I/O supply range | IOVDD = +2.7V to +5.25V supports direct connection to 3.3V or 5V logic families without level translators |
| Out-of-range monitoring | Dedicated OTR pin asserts high when AINP or AINN exceeds absolute limits (−0.1V to +4.6V), enabling real-time fault detection |
Applications
| Vibration Analysis Systems | Medical Imaging Front-Ends |
|---|---|
|
Use Scenario: High-resolution capture of mechanical resonance signatures from accelerometers in predictive maintenance equipment. IC Role / Device Role / Timing Role: Primary digitizer converting conditioned analog sensor outputs into 18-bit samples at 1.25MSPS for FFT-based spectral analysis. Use Value: 93dB SNR and 103dB SFDR enable detection of sub-millig acceleration harmonics buried in noise floor. |
Use Scenario: Digitizing ultrasound transducer return signals in portable diagnostic imaging devices. IC Role / Device Role / Timing Role: High-linearity ADC sampling RF echo data with minimal phase distortion across 615kHz bandwidth. Use Value: Linear-phase digital filter and ±0.0025dB passband ripple preserve time-domain fidelity for beamforming accuracy. |
| Automated Test Equipment (ATE) | Scientific Instrumentation |
|
Use Scenario: Precision waveform acquisition in modular PXI-based test platforms verifying high-speed DAC performance. IC Role / Device Role / Timing Role: Reference-grade ADC validating output linearity, THD, and SFDR of 16-bit+ DACs under production test. Use Value: −101dB THD and no missing codes (18-bit) provide metrological confidence for calibration traceability. |
Use Scenario: Low-drift data logging in laboratory spectrometers measuring weak optical absorption signals. IC Role / Device Role / Timing Role: Low-power, high-SNR digitizer operating from internal reference with <1ppmFSR/°C offset drift. Use Value: Adjustable power dissipation (150–515mW) allows thermal optimization in sealed instrument enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed, high-precision ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1625IPAPR | No FIFO buffer; identical resolution, data rate, SNR, THD, and package | Lacks burst-mode buffering; requires continuous host readout or external FIFO | Select when deterministic latency and minimal interface complexity outweigh need for data buffering |
| ADS1606IPAPT | 16-bit resolution, 5MSPS, FIFO-enabled, but lower SNR (88dB) and SFDR (95dB) | Better suited for wideband, lower-precision applications like communications test | Choose for higher throughput where 2-bit resolution trade-off is acceptable and 5MSPS is required |
Compared with ADS1625IPAPR, the ADS1626IPAPR adds FIFO flexibility at identical precision; versus ADS1606IPAPT, it trades speed for 2-bit resolution gain and 8dB SFDR improvement-critical for scientific and medical signal integrity.
Availability
ADS1626IPAPR is available at Aetrix Electronics and suitable for vibration analysis systems, medical imaging front-ends, and automated test equipment requiring stable component supply, long-term manufacturability, and TI-qualified industrial temperature performance.
Supply support for ADS1626IPAPR 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 ADS1626IPAPR belongs to TI's high-performance delta-sigma ADC family designed for demanding measurement applications-including scientific instruments, medical diagnostics, and industrial test systems-where resolution, linearity, and noise performance are non-negotiable.
FAQ
What is the maximum clock frequency supported by the ADS1626IPAPR?
The ADS1626IPAPR supports a clock input frequency (fCLK) ranging from 1MHz to 50MHz, with typical operation at 40MHz to achieve its rated 1.25MSPS data rate. At fCLK = 40MHz, aperture delay is 4ns and group delay is 20.8µs-key parameters for time-critical synchronization in multi-channel systems. Exceeding 50MHz violates absolute maximum ratings and risks timing violation or permanent damage.
Does the ADS1626IPAPR require an external reference voltage?
No-the ADS1626IPAPR includes a selectable on-chip reference. When REFEN is pulled low, the internal 3.0V reference (with 50ppm/°C drift) is enabled; when REFEN is high, the device accepts an external 2.5–3.2V differential reference across VREFP/VREFN. This dual-mode capability eliminates external reference components in cost-sensitive designs while preserving accuracy for metrology-grade applications.
How does the FIFO function in the ADS1626IPAPR differ from standard buffer implementations?
The ADS1626IPAPR's FIFO is configured via three dedicated pins (FIFO_LEV[2:0]) to set depth from 1 to 8 words, unlike fixed-depth or software-configurable buffers. Its timing is tightly coupled to DRDY: when enabled, DRDY period becomes 32 × FIFO Level clock cycles, allowing predictable host read scheduling. This hardware-level FIFO offloads real-time data handling from the host processor-critical in TMS320C6000-based systems with limited DMA bandwidth.
What are the absolute voltage limits for the AINP and AINN inputs of the ADS1626IPAPR?
The absolute input voltage for AINP or AINN must remain between −0.1V and +4.6V relative to AGND. Violating the lower limit forward-biases ESD protection diodes; exceeding the upper limit degrades linearity and may cause permanent damage. For optimal performance at −2dBFS, TI recommends constraining absolute inputs to +0.1V to +4.2V. These limits are independent of common-mode voltage and must be enforced in front-end driver design.
Can the ADS1626IPAPR operate with different analog and digital supply voltages?
Yes-the ADS1626IPAPR uses independent supplies: AVDD = +4.75V to +5.25V (analog), DVDD = +2.7V to +3.3V (digital core), and IOVDD = +2.7V to +5.25V (I/O interface). This separation prevents digital switching noise from coupling into the analog path. IOVDD flexibility allows direct interfacing with 3.3V FPGAs or 5V microcontrollers without level shifters-reducing BOM count and layout complexity in mixed-voltage systems.
ADS1626IPAPR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 64-PowerTQFP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Number of Bits:
- 18
- Sampling Rate (Per Second):
- 1.25M
- Number of Inputs:
- 1
- Input Type:
- Differential
- Data Interface:
- Parallel
- Configuration:
- ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- Sigma-Delta
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 2.7V ~ 3.3V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 64-HTQFP (10x10)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS1626IPAPR FAQ
1.How can I place an order for ADS1626IPAPR through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS1626IPAPR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ADS1626IPAPR reliable?
The price and inventory of ADS1626IPAPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS1626IPAPR is usually 5 days.
3.What payment methods are accepted for ADS1626IPAPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS1626IPAPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS1626IPAPR?
ADS1626IPAPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS1626IPAPR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ADS1626IPAPR?
For technical support, including ADS1626IPAPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS1626IPAPR requirements.
6.How does Aetrix verify that ADS1626IPAPR is sourced from the original manufacturer or authorized distributors?
All ADS1626IPAPR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ADS1626IPAPR meets industry standards.
7.What is the process for return or replacement of ADS1626IPAPR?
All ADS1626IPAPR units undergo pre-shipment inspection (PSI). If there is an issue with ADS1626IPAPR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ADS1626IPAPR part is unused and in its original packaging.
Return procedure for ADS1626IPAPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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