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Texas Instruments ADS1625IPAPR
- Part No.:
- ADS1625IPAPR
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 64-PowerTQFP
- Datasheet:
-
ADS1625IPAPR.pdf
- Description:
- IC ADC 18BIT SIGMA-DELTA 64HTQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,113
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Product details
Overview
ADS1625IPAPR 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 features a 615kHz linear-phase passband, ±0.0025dB passband ripple, and operates from +5V analog / +3V digital supplies. Designed for high-fidelity data acquisition in medical imaging and vibration analysis systems.
For engineers reviewing the ADS1625IPAPR datasheet, ADS1625IPAPR pinout, ADS1625IPAPR application, or ADS1625IPAPR equivalent, key selection criteria include its 18-bit resolution at 1.25MSPS, on-chip reference selectability, parallel DSP interface compatibility, and TQFP-64 PowerPAD™ package thermal performance.
Technical Context
The ADS1625IPAPR employs a stable 2-1-1 pipelined delta-sigma modulator sampling at 40MSPS (fCLK = 40MHz), decimated by a low-ripple digital filter to deliver 1.25MSPS output. Its analog input measures differential VIN = (AINP – AINN) against scaled VREF = (VREFP – VREFN), supporting full-scale input of ±1.467VREF.
It uses switched-capacitor input circuitry requiring precise external drive: input switches close for ≈12ns per cycle at 40MHz, demanding low-impedance, high-slew-rate drivers. The device supports internal or external reference, out-of-range monitoring via OTR pin, and power-down mode via PD pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit-guarantees no missing codes and enables sub-10µV measurement resolution with 3V reference. |
| Data Rate | 1.25MSPS-supports real-time capture of signals up to 615kHz bandwidth without aliasing. |
| SNR | 93dB at 10kHz/−2dBFS-enables >15.5 effective number of bits (ENOB) for precision instrumentation. |
| THD | −101dB at 10kHz/−2dBFS-ensures minimal harmonic contamination in spectral analysis applications. |
| SFDR | 103dB at 100kHz/−6dBFS-provides clean dynamic range for detecting weak signals amid strong interferers. |
| Passband Ripple | ±0.0025dB to 550kHz-preserves amplitude fidelity across critical measurement bands in medical imaging. |
| Analog Supply | +5V AVDD-requires low-noise regulation; power dissipation adjustable from 150mW to 515mW via RBIAS resistor. |
Pinout & Package
The ADS1625IPAPR is housed in a thermally enhanced HTQFP-64 (PAP) package with TI PowerPAD™ technology, featuring 64 leads and an exposed thermal pad for PCB-level heat dissipation (θJA = 25°C/W with 2oz copper).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AINP / AINN | Differential analog input | Accepts ±1.467VREF full-scale differential signal; requires matched low-impedance drive for optimal linearity. |
| VREFP / VREFN | Reference voltage terminals | Support internal (2.5–3.2V) or external reference; define ADC full-scale range and noise floor. |
| CLK | Master clock input | Accepts 1–50MHz CMOS clock; timing-critical-aperture delay is 4ns, dictating jitter sensitivity. |
| DOUT[17:0] | Parallel data output bus | 18-bit MSB-first output; directly interfaces TMS320C6000 DSPs without level-shifting when IOVDD = 3V. |
| DRDY | Data-ready strobe | Active-low signal synchronized to CLK falling edge; used to latch valid DOUT data in synchronous read cycles. |
| PD | Power-down control | Active-low input with internal 170kΩ pull-up; reduces power to 5mW when asserted, enabling rapid wake-up. |
| OTR | Out-of-range indicator | Open-drain output asserts high when |VIN| > 1.467VREF-enables real-time overvoltage fault detection. |
| RBIAS | Analog bias current setting | Connects external resistor (e.g., 37kΩ) to set AVDD current and scale power vs. speed trade-off. |
Key Features
| Feature | Design Value |
|---|---|
| Linear-phase digital filter | 615kHz −3dB bandwidth with ±0.0025dB ripple to 550kHz-preserves phase coherence in time-domain signal analysis. |
| Selectable on-chip reference | Internal 3V reference (50ppm/°C drift) eliminates external ref IC, reducing BOM count and layout area in portable instruments. |
| Direct TMS320C6000 DSP interface | Parallel 18-bit bus with DRDY/CS/RD timing compliant to C6000 EMIF-enables zero-wait-state data transfer at 1.25MSPS. |
| Adjustable analog power dissipation | External RBIAS resistor scales IAVDD from 85mA to 135mA-allows optimization between thermal budget and SNR in space-constrained enclosures. |
| Out-of-range monitoring | Dedicated OTR pin provides immediate hardware-level fault indication-reduces software polling overhead in safety-critical ATE systems. |
Applications
| Scientific Instruments | Automated Test Equipment |
|---|---|
Use Scenario: High-resolution spectral analysis of laser interferometry signals in metrology-grade coordinate measuring machines. IC Role / Device Role / Timing Role: Primary digitizer capturing 615kHz bandwidth analog outputs from low-noise photodetector front-ends. Use Value: 93dB SNR and −101dB THD enable detection of sub-nanometer displacement harmonics masked by amplifier noise. | Use Scenario: Real-time waveform capture during functional testing of RF power amplifiers in production test racks. IC Role / Device Role / Timing Role: High-speed acquisition engine synchronizing with pattern generator clocks to sample transient distortion events. Use Value: 1.25MSPS rate with deterministic DRDY timing ensures precise alignment of stimulus-response data pairs. |
| Data Acquisition Systems | Medical Imaging |
Use Scenario: Multi-channel physiological signal recording (ECG, EEG) in portable diagnostic devices with battery-life constraints. IC Role / Device Role / Timing Role: Low-power, high-accuracy ADC channel with selectable internal reference and power-down mode. Use Value: Adjustable 150–515mW dissipation allows runtime scaling of sampling rate vs. battery drain without hardware change. | Use Scenario: Ultrasound beamformer digitization where phase coherence across channels is critical for spatial resolution. IC Role / Device Role / Timing Role: Channel ADC providing linear-phase response to preserve time-of-flight accuracy in echo processing. Use Value: ±0.0025dB passband ripple minimizes amplitude distortion across 550kHz imaging band, improving contrast resolution. |
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 |
|---|---|---|---|
| ADS1626IPAPR | Identical specs except includes adjustable FIFO buffer (FIFO_LEV[2:0] pins); ADS1625 lacks FIFO logic and associated pins. | Required when burst-mode data buffering is needed before DSP read; unnecessary if continuous streaming suffices. | Select ADS1625IPAPR when FIFO adds cost/complexity without benefit; verify pin compatibility-FIFO_LEV pins are NC on ADS1625. |
| AD7641ASTZ | 18-bit, 2MSPS SAR ADC (not delta-sigma); 91.5dB SNR, −92dB THD, no on-chip reference; requires external REF. | Better suited for multiplexed multi-channel systems needing lower latency; lacks inherent anti-alias filtering of delta-sigma architecture. | Choose AD7641ASTZ for <1µs conversion latency or simultaneous sampling across multiple channels; ADS1625IPAPR preferred for ultimate SNR/SFDR in single-channel high-dynamic-range apps. |
Compared with ADS1626IPAPR, ADS1625IPAPR saves board space and cost by omitting FIFO logic while retaining identical AC performance; versus AD7641ASTZ, it delivers superior SFDR (+11dB) and integrated reference but with higher latency and oversampling dependency.
Availability
ADS1625IPAPR 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 ADS1625IPAPR 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 precision data converter innovation.
The ADS16xx family-including ADS1625IPAPR-is engineered for demanding measurement applications where ultra-low distortion, wide dynamic range, and deterministic timing are essential in scientific, medical, and industrial systems.
FAQ
What is the maximum clock frequency supported by ADS1625IPAPR?
The ADS1625IPAPR accepts a master clock (CLK) input 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 analog front-end settling constraints.
Does ADS1625IPAPR include an internal voltage reference?
Yes, ADS1625IPAPR includes a selectable internal reference generating 3.0V nominal (2.5–3.2V range) with 50ppm/°C drift. When REFEN is low, the internal reference activates; when high, the device uses external VREFP/VREFN. This eliminates need for external reference ICs in space-constrained designs.
What is the function of the RBIAS pin on ADS1625IPAPR?
The RBIAS pin on ADS1625IPAPR connects to an external resistor that sets analog supply current (IAVDD) and thus total power dissipation. With RBIAS = 37kΩ, IAVDD is 105mA (REFEN = high); increasing RBIAS reduces current, enabling power scaling from 150mW to 515mW without changing clock or data rate.
Can ADS1625IPAPR interface directly with 3.3V logic systems?
Yes, ADS1625IPAPR supports direct interfacing with 3.3V logic via its independent IOVDD supply (2.7–5.25V range). With IOVDD = 3.3V, its DOUT[17:0], DRDY, CS, and RD pins meet 3.3V CMOS voltage thresholds, enabling seamless connection to TMS320C6000 DSPs and other 3.3V processors without level shifters.
What does the OTR pin indicate on ADS1625IPAPR?
The OTR (Out-of-Range) pin on ADS1625IPAPR is an open-drain digital output that asserts high when the absolute differential input voltage |AINP − AINN| exceeds ±1.467VREF. It provides immediate hardware-level fault detection-critical for protecting downstream processing stages in vibration analysis and ATE systems.
ADS1625IPAPR 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:
- -
ADS1625IPAPR FAQ
1.How can I place an order for ADS1625IPAPR through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS1625IPAPR 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 ADS1625IPAPR reliable?
The price and inventory of ADS1625IPAPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS1625IPAPR is usually 5 days.
3.What payment methods are accepted for ADS1625IPAPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS1625IPAPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS1625IPAPR?
ADS1625IPAPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS1625IPAPR 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 ADS1625IPAPR?
For technical support, including ADS1625IPAPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS1625IPAPR requirements.
6.How does Aetrix verify that ADS1625IPAPR is sourced from the original manufacturer or authorized distributors?
All ADS1625IPAPR 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 ADS1625IPAPR meets industry standards.
7.What is the process for return or replacement of ADS1625IPAPR?
All ADS1625IPAPR units undergo pre-shipment inspection (PSI). If there is an issue with ADS1625IPAPR, 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 ADS1625IPAPR part is unused and in its original packaging.
Return procedure for ADS1625IPAPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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