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Texas Instruments ADS1625IPAPT
- Part No.:
- ADS1625IPAPT
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 64-PowerTQFP
- Datasheet:
-
ADS1625IPAPT.pdf
- Description:
- IC ADC 18BIT SIGMA-DELTA 64HTQFP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
ADS1625IPAPT from Texas Instruments is an 18-bit, 1.25MSPS delta-sigma analog-to-digital converter (ADC) with 93dB SNR, −101dB THD, and 103dB SFDR. It operates from +5V analog and +3V digital supplies, supports ±1.467VREF differential input range, and delivers linear-phase filtering up to 615kHz bandwidth-designed for high-fidelity data acquisition in medical imaging systems.
For engineers reviewing the ADS1625IPAPT datasheet, ADS1625IPAPT pinout, ADS1625IPAPT application, or ADS1625IPAPT equivalent, key selection criteria include its 18-bit resolution at 1.25MSPS, on-chip reference enable (REFEN), parallel 18-bit DOUT interface, adjustable analog power dissipation via RBIAS, and TQFP-64 PowerPAD™ package compatibility with TMS320C6000 DSPs.
Technical Context
The ADS1625IPAPT employs a stable 2-1-1 pipelined delta-sigma modulator sampling at 40MSPS (fCLK = 40MHz), decimated by a low-ripple linear-phase digital filter to produce 1.25MSPS output data. Its architecture achieves ±0.0025dB passband ripple to 550kHz and −3dB bandwidth at 615kHz.
It measures differential input (AINP–AINN) against scalable reference (VREFP–VREFN), supports internal/external reference selection via REFEN, and uses separate IOVDD (2.7V–5.25V) for logic-level flexibility. Power-down mode (PD pin) reduces consumption to 5mW, and analog supply current is set by external RBIAS resistor (37kΩ typical).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit-guarantees no missing codes and supports high-precision measurement of small signal variations in vibration analysis. |
| Data Rate | 1.25MSPS-enables real-time capture of fast transients in automated test equipment without undersampling. |
| SNR | 93dB at fIN = 10kHz, −2dBFS-ensures clean digitization of low-amplitude signals in scientific instruments. |
| THD | −101dB at fIN = 10kHz, −2dBFS-minimizes harmonic contamination critical for medical imaging fidelity. |
| SFDR | 103dB at fIN = 100kHz, −6dBFS-provides robust spurious-free operation in dense spectral environments like spectrum analyzers. |
| Passband Ripple | ±0.0025dB to 550kHz-preserves amplitude integrity across wideband signals in data acquisition front-ends. |
| Analog Supply | +5V AVDD-requires stable low-noise analog rail; AVDD current ranges 85–135mA depending on REFEN state. |
Pinout & Package
ADS1625IPAPT is housed in a 64-pin HTQFP (PAP) package with TI PowerPAD™ thermal pad, optimized for high-power analog performance and PCB heat dissipation. The exposed thermal pad must be soldered to a large copper area per TI design guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AINP / AINN | Differential analog input | Accepts ±1.467VREF full-scale differential signal; requires matched layout and common-mode voltage (VCM = 2.0V) for optimal linearity. |
| VREFP / VREFN | Reference voltage inputs | Supports external 2.5–3.2V differential reference or internal reference enabled via REFEN pin. |
| RBIAS | Analog bias control | Connects external resistor (e.g., 37kΩ) to set analog supply current and adjust power dissipation between 150–515mW. |
| PD | Power-down control | Active-low digital input; asserts to shut down all circuitry and reduce power to 5mW-critical for low-duty-cycle instrumentation. |
| DOUT[17:0] | Parallel data output | 18-bit MSB-first parallel bus; directly interfaces with TMS320C6000 DSPs without glue logic; timing-critical (t6 = 15ns setup). |
| DRDY | Data-ready indicator | Active-low pulse synchronized to CLK falling edge; signals valid data on DOUT for synchronous read operations. |
| REFEN | Reference enable | Active-low input controlling internal reference; internal 170kΩ pull-down ensures default external reference mode if left unconnected. |
| CLK | Master clock input | Accepts 1–50MHz CMOS clock; 40MHz nominal yields 1.25MSPS output; duty cycle 45–55% required for timing compliance. |
Key Features
| Feature | Design Value |
|---|---|
| Linear-phase digital filter | 615kHz −3dB bandwidth with ±0.0025dB passband ripple preserves phase coherence in time-domain applications like ultrasound beamforming. |
| Selectable on-chip reference | Internal 3.0V reference (50ppm/°C drift) eliminates external reference ICs-reducing BOM count and board space in portable medical devices. |
| Adjustable analog power dissipation | RBIAS resistor sets IAVDD from 85–135mA; enables dynamic power scaling for battery-powered test equipment operating below 1.25MSPS. |
| Out-of-range monitor (OTR) | Dedicated open-drain output asserts high when |AINP–AINN| > ±1.467VREF; enables real-time overvoltage protection without host processor intervention. |
| Digital I/O supply flexibility | IOVDD supports 2.7V–5.25V-allows direct interfacing with 3.3V FPGA, 5V microcontrollers, or mixed-voltage industrial PLCs without level shifters. |
Applications
| Scientific Instrumentation | Automated Test Equipment |
|---|---|
|
Use Scenario: High-resolution spectral analysis of low-level physical phenomena (e.g., laser interferometry, particle detection). IC Role / Device Role / Timing Role: Primary ADC capturing 18-bit samples at 1.25MSPS with 93dB SNR to resolve sub-microvolt signal features. Use Value: ±0.0025dB passband ripple and 103dB SFDR ensure accurate amplitude and frequency representation without post-processing correction. |
Use Scenario: Production-line functional testing of RF components requiring fast, repeatable digitization of stimulus-response waveforms. IC Role / Device Role / Timing Role: High-speed data acquisition front-end synchronized to test controller clocks via DRDY/CLK interface. Use Value: Parallel 18-bit DOUT and 15ns data-valid timing (t6) enable deterministic, low-latency data transfer to FPGA-based pattern generators. |
| Medical Imaging | Vibration Analysis |
|
Use Scenario: Ultrasound receive-path digitization where phase linearity and low THD preserve image contrast and spatial resolution. IC Role / Device Role / Timing Role: Delta-sigma ADC providing linear-phase filtering to maintain time-of-flight accuracy across 615kHz bandwidth. Use Value: −101dB THD prevents harmonic artifacts from degrading B-mode image quality; 93dB SNR supports deep tissue penetration detection. |
Use Scenario: Condition monitoring of rotating machinery using broadband acceleration sensor outputs sampled up to 600kHz. IC Role / Device Role / Timing Role: Precision ADC capturing transient shock events and resonant frequencies with minimal aliasing. Use Value: 103dB SFDR isolates weak fault signatures (e.g., bearing defects) amid strong fundamental tones; 18-bit resolution resolves micro-strain levels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-precision, high-speed ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1626IPAPT | Identical specs but includes adjustable FIFO buffer (FIFO_LEV[2:0]); ADS1625IPAPT lacks FIFO pins and buffer logic. | ADS1626IPAPT supports burst-mode data capture with programmable depth; ADS1625IPAPT requires continuous host-read timing. | Select ADS1625IPAPT when deterministic, low-latency streaming is prioritized and FIFO complexity is unnecessary. |
| AD7641ASTZ | SAR architecture (not delta-sigma); 18-bit, 2MSPS, 91.5dB SNR, no on-chip reference; requires external reference and driver. | Better throughput but lower noise floor; unsuitable for DC-coupled, ultra-low-distortion applications like MRI front-ends. | Choose AD7641ASTZ only when single-shot acquisition speed outweighs SNR/THD requirements and external support circuitry is acceptable. |
Compared with ADS1626IPAPT, ADS1625IPAPT offers identical precision and bandwidth without FIFO overhead-ideal for synchronous DSP interfaces. Against AD7641ASTZ, ADS1625IPAPT provides superior SNR and integrated reference at the cost of lower maximum throughput and delta-sigma latency.
Availability
ADS1625IPAPT is available at Aetrix Electronics and suitable for scientific instrumentation, automated test equipment, and medical imaging systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for ADS1625IPAPT 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 ADS1625IPAPT belongs to TI's high-performance delta-sigma ADC family designed specifically for demanding measurement applications-including medical imaging, test equipment, and scientific data acquisition-where SNR, THD, and phase linearity are critical.
FAQ
What is the maximum clock frequency supported by ADS1625IPAPT?
The ADS1625IPAPT supports a master clock (CLK) frequency from 1MHz to 50MHz. At 40MHz, it achieves its rated 1.25MSPS output data rate with optimal SNR and THD performance. Operation above 40MHz may reduce dynamic specifications due to increased jitter sensitivity and timing margin compression-always verify timing compliance per SBAS280E Section 8.
Does ADS1625IPAPT include an internal voltage reference?
Yes, ADS1625IPAPT includes an internal 3.0V reference with 50ppm/°C drift, enabled by pulling the REFEN pin low. When REFEN is high (or left floating, due to internal 170kΩ pull-down), the device defaults to external reference mode. Internal reference startup time is 15ms, and it drives VREFP/VREFN pins at 3.75–4.25V and 0.75–1.25V respectively.
How does the RBIAS resistor affect ADS1625IPAPT power consumption?
The RBIAS resistor directly sets analog supply current (IAVDD): at 37kΩ, IAVDD is 85–135mA depending on REFEN state, yielding 150–515mW total power. Increasing RBIAS reduces IAVDD and dissipation-e.g., 60kΩ lowers IAVDD to ~60mA-enabling lower-speed operation with reduced thermal load in compact enclosures.
Can ADS1625IPAPT interface directly with a 5V microcontroller?
Yes-ADS1625IPAPT supports IOVDD from 2.7V to 5.25V, so connecting IOVDD to 5V allows direct interfacing with 5V logic families. Digital inputs (CS, RD, PD, RESET) accept VIH ≥ 0.7×IOVDD and VIL ≤ 0.3×IOVDD; outputs (DRDY, OTR, DOUT) drive VOH ≥ 0.8×IOVDD and VOL ≤ 0.2×IOVDD under 50µA load.
What is the function of the OTR pin on ADS1625IPAPT?
The OTR (Out-of-Range) pin is an active-high, open-drain digital output that asserts when the differential input (AINP–AINN) exceeds ±1.467VREF. It provides immediate hardware-level overvoltage detection without software polling-enabling fast system shutdown or signal clamping in medical safety-critical paths or test equipment protection circuits.
ADS1625IPAPT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 64-PowerTQFP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- -
ADS1625IPAPT FAQ
1.How can I place an order for ADS1625IPAPT through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS1625IPAPT 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 ADS1625IPAPT reliable?
The price and inventory of ADS1625IPAPT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS1625IPAPT is usually 5 days.
3.What payment methods are accepted for ADS1625IPAPT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS1625IPAPT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS1625IPAPT?
ADS1625IPAPT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS1625IPAPT 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 ADS1625IPAPT?
For technical support, including ADS1625IPAPT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS1625IPAPT requirements.
6.How does Aetrix verify that ADS1625IPAPT is sourced from the original manufacturer or authorized distributors?
All ADS1625IPAPT 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 ADS1625IPAPT meets industry standards.
7.What is the process for return or replacement of ADS1625IPAPT?
All ADS1625IPAPT units undergo pre-shipment inspection (PSI). If there is an issue with ADS1625IPAPT, 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 ADS1625IPAPT part is unused and in its original packaging.
Return procedure for ADS1625IPAPT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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