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Texas Instruments ADS7280IPWR
- Part No.:
- ADS7280IPWR
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
ADS7280IPWR.pdf
- Description:
- IC ADC 14BIT SAR 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,821
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Product details
Overview
ADS7280IPWR from Texas Instruments is a 14-bit, 1-MSPS dual-channel unipolar successive approximation register (SAR) analog-to-digital converter with integrated 2:1 input multiplexer, programmable TAG bit output, and SPI/DSP-compatible serial interface. It operates from 2.7V to 5.5V analog supply, delivers ±0.4 LSB typical INL/DNL, and supports daisy-chain mode for multi-ADC systems in industrial data acquisition.
For engineers reviewing the ADS7280IPWR datasheet, ADS7280IPWR pinout, ADS7280IPWR application, or ADS7280IPWR equivalent, key selection considerations include its dual-input MUX with auto/manual channel select, 105.3 dB SFDR at 10 kHz, built-in conversion clock (21–24.5 MHz), and TSSOP-16 package compatibility with industrial temperature range (–40°C to +85°C).
Technical Context
The ADS7280IPWR implements a capacitor-based SAR architecture with inherent sample-and-hold, supporting both manual (CONVST-triggered) and auto-triggered conversion modes. Its dual-input MUX (+IN0/+IN1 with shared COM) enables time-multiplexed sampling of two analog sources without external switching.
It features three power-down states-deep power-down (4 µA), nap (0.5 µA), and auto-nap-with programmable EOC/INT polarity and status reporting via the EOC/INT/CDI pin. The device uses an internal CCLK derived from SCLK (fCCLK = fSCLK/2) and supports up to 42 MHz SCLK for high-throughput serial transfers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit - Delivers 16,384 discrete digital codes for high-fidelity signal digitization. |
| Sampling Rate | 1 MSPS at +VA ≥ 3V - Enables real-time capture of signals up to ~400 kHz Nyquist bandwidth. |
| INL / DNL | ±0.4 LSB typical - Ensures monotonicity and minimal code-width variation across full scale. |
| SFDR | 105.3 dB at 10 kHz - Supports high-dynamic-range applications such as precision sensor readout and instrumentation. |
| Power Dissipation | 13.7 mW at 1 MSPS, +VA = 3V, +VBD = 1.8V - Optimized for low-power portable or battery-backed industrial systems. |
| Input Range | 0 V to VREF (unipolar) - Simplifies signal conditioning by eliminating need for level-shifting circuitry. |
| Serial Interface | SPI/DSP-compatible, up to 42 MHz SCLK - Enables direct connection to TI C2000™ or Sitara™ processors without glue logic. |
Pinout & Package
TSSOP-16 package (PW designation), 4.4 mm × 5.0 mm body, 0.65 mm pitch, exposed thermal pad not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | +VA | Analog supply input (2.7–5.5 V); powers internal SAR, reference buffer, and sample-and-hold. |
| 2 | +IN1 | Second noninverting analog input for dual-channel operation; selected when TAG = 1 in auto mode. |
| 3 | +IN0 | First noninverting analog input; default channel in auto-select mode (TAG = 0). |
| 4 | COM | Common inverting input; typically tied to AGND for single-ended unipolar measurements. |
| 5 | AGND | Analog ground reference; must be star-connected and isolated from digital ground to minimize noise coupling. |
| 6 | REF– | Reference negative terminal; requires dedicated via to AGND to maintain PSRR and offset stability. |
| 7 | REF+ (REFIN) | External reference positive input; accepts 0.3–5.5 V, 40 kΩ input impedance, defines full-scale range. |
| 8 | BDGND | Interface ground; separates digital I/O domain (+VBD) from analog domain to reduce switching noise injection. |
| 9 | CONVST | Conversion start trigger; edge-sensitive input that freezes S/H and initiates conversion on next internal clock edge. |
| 10 | EOC/INT/CDI | Configurable status pin: EOC (default), INT (programmable pulse), or CDI (daisy-chain data input). |
| 11 | FS/CS | Frame sync / chip select; active-low SPI slave select; synchronizes serial data transfers and enables daisy-chain mode. |
| 12 | SDI | Serial data input; accepts command bits for reset, channel select, and EOC/INT configuration during first 4 SCLK cycles. |
| 13 | SDO | Serial data output; MSB-first straight-binary format; tri-state controlled by CS to support bus sharing. |
| 14 | NC | No internal connection; must be left floating or tied to AGND per layout guidelines. |
| 15 | SCLK | Serial clock input; drives both interface timing and internal conversion clock (fCCLK = fSCLK/2). |
| 16 | +VBD | Buffer/digital I/O supply (1.65–5.5 V); sets logic thresholds for SDI/SDO/FS/CS and isolates I/O noise from analog section. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-input MUX with auto/manual channel select | Enables seamless switching between two analog sensors using software control or hardware TAG bit, reducing external mux count and PCB area. |
| Programmable TAG bit output | Appends 1-bit channel identifier to each 14-bit conversion result, allowing unambiguous source attribution in daisy-chain configurations. |
| Built-in conversion clock (CCLK) | Eliminates need for external clock generator; internal CCLK derived from SCLK simplifies system clock tree design and reduces jitter sensitivity. |
| Three-tier power-down modes | Deep power-down (4 µA), nap (0.5 µA), and auto-nap (self-activated between conversions) enable dynamic power scaling in battery-powered monitoring nodes. |
| SPI/DSP serial interface with daisy-chain support | Allows up to 8 ADS7280IPWR devices on a single 3-wire bus (FS, SCLK, SDO), minimizing microcontroller GPIO usage and routing complexity. |
Applications
| Industrial Process Monitoring | Medical Sensor Interface |
|---|---|
Use Scenario: Continuous voltage/current measurement from multiple pressure, flow, or temperature transducers in PLC analog input modules. IC Role / Device Role / Timing Role: Dual-channel SAR ADC with MUX performs time-interleaved sampling of two 4–20 mA loop receivers, synchronized via CONVST. Use Value: 14-bit resolution and ±0.4 LSB INL ensure <0.01% full-scale accuracy over temperature, meeting IEC 61000-4-3 immunity requirements. | Use Scenario: Digitizing outputs from low-noise biopotential amplifiers (ECG, EEG) in portable diagnostic equipment. IC Role / Device Role / Timing Role: High-SFDR ADC captures small-amplitude physiological signals while rejecting switching noise from nearby DC/DC converters. Use Value: 105.3 dB SFDR at 10 kHz and 85.9 dB SNR suppress harmonic distortion from electrode-skin interface, preserving waveform fidelity. |
| Magnetometer Data Acquisition | Automated Test Equipment (ATE) |
Use Scenario: Reading differential outputs from fluxgate or AMR magnetometers in navigation-grade inertial measurement units (IMUs). IC Role / Device Role / Timing Role: Unipolar ADC with COM-referenced inputs conditions low-offset, high-impedance sensor outputs without external op-amp buffering. Use Value: 109 dB input channel isolation prevents crosstalk between orthogonal magnetometer axes, critical for heading accuracy. | Use Scenario: High-speed digitization of stimulus-response waveforms in semiconductor parametric test systems. IC Role / Device Role / Timing Role: 1-MSPS sampling captures transient responses of DUTs with sub-microsecond timing resolution using global CONVST synchronization. Use Value: Global CONVST (independent of CS) allows precise inter-device timing alignment across multiple ADC channels in parallel test fixtures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel 14-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7279IPWR | Single-input (no MUX), identical core performance, same pinout except +IN1/COM replaced by +IN/–IN. | Lacks dual-channel capability; suitable only where one analog input suffices and board space permits redesign. | Select when cost reduction is prioritized over channel flexibility and no future expansion is needed. |
| ADS8329IPWR | 16-bit resolution, 500 kSPS, no internal MUX or TAG bit, higher power (25 mW), SPI-only interface. | Higher resolution but lower speed; requires external MUX for dual inputs and lacks daisy-chain support. | Choose when absolute precision >14 bits is required and throughput ≤500 kSPS is acceptable. |
Compared with ADS7279IPWR and ADS8329IPWR, the ADS7280IPWR uniquely integrates dual-input selection, TAG-bit identification, and daisy-chain capability in a 1-MSPS 14-bit package-making it optimal for space-constrained, multi-sensor industrial DAQ where channel scalability matters.
Availability
ADS7280IPWR is available at Aetrix Electronics and suitable for industrial process control, medical instrumentation, magnetometer interfacing, and automated test equipment requiring stable component supply across extended temperature ranges.
Supply support for ADS7280IPWR 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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and connectivity technologies for industrial, automotive, and consumer markets.
The ADS7280IPWR belongs to TI's precision SAR ADC product line, designed specifically for high-accuracy, low-power data acquisition in harsh industrial environments with wide supply voltage tolerance and robust noise immunity.
FAQ
What is the maximum sampling rate of the ADS7280IPWR under 3V analog supply?
The ADS7280IPWR achieves a maximum sampling rate of 1 MSPS when the analog supply (+VA) is between 3.0 V and 5.5 V. At +VA = 2.7 V to <3.0 V, the maximum rate drops to 900 kSPS due to internal clock limitations. This behavior is specified in the Electrical Characteristics table for 2.7–3.6 V operation and confirmed in the Timing Characteristics section for 1.8 V interface conditions. The ADS7280IPWR maintains full 14-bit performance across both ranges.
Does the ADS7280IPWR require an external reference voltage?
Yes, the ADS7280IPWR requires an external reference voltage applied between REF+ (Pin 7) and REF– (Pin 6). It supports reference voltages from 0.3 V to +VA, with typical values of 2.5 V (at +VA = 3 V) or 5 V (at +VA = 5 V). The reference input has 40 kΩ impedance and must be decoupled with a 100 nF ceramic capacitor close to the pins. The ADS7280IPWR does not include an internal reference; all accuracy specifications assume a stable, low-noise external reference.
How does the programmable TAG bit function in the ADS7280IPWR?
The TAG bit is a 1-bit channel identifier appended to the 14-bit conversion result in auto channel select mode. When enabled, the ADS7280IPWR outputs 15 bits per frame: MSB = TAG (0 for +IN0, 1 for +IN1), followed by 14 data bits. This allows unambiguous identification of the sampled channel in daisy-chain configurations without additional control lines. The TAG bit is configured via SDI command bits during initialization and is independent of EOC/INT polarity settings.
Can the ADS7280IPWR operate in daisy-chain mode with mixed part numbers like ADS7279IPWR?
Yes, the ADS7280IPWR supports daisy-chain mode with other devices in the ADS72xx family-including ADS7279IPWR-using the EOC/INT/CDI pin as chain data input. All devices share the same serial protocol, timing, and data format (MSB-first straight binary). However, ADS7279IPWR lacks the TAG bit and dual-input MUX, so channel identification must be handled externally. Daisy-chain operation requires FS/CS common to all devices and proper SDO-to-SDI cascading with correct SCLK edge alignment.
What are the power-supply sequencing requirements for ADS7280IPWR?
The ADS7280IPWR has no strict power-supply sequencing requirement between +VA (analog) and +VBD (digital I/O), but TI recommends powering +VA before or simultaneously with +VBD to ensure proper analog biasing before digital interface activation. BDGND and AGND should be connected at a single point near the device. Violating this may cause undefined startup behavior or increased offset error. The absolute maximum ratings specify that +VA and +VBD may be applied within 100 ms of each other without damage, but functional reliability is optimized with simultaneous or +VA-first sequencing.
ADS7280IPWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 14
- Sampling Rate (Per Second):
- 1M
- Number of Inputs:
- 2
- Input Type:
- Pseudo-Differential, Single Ended
- Data Interface:
- SPI, DSP
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 1.65V ~ 5.5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 16-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS7280IPWR FAQ
1.How can I place an order for ADS7280IPWR through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7280IPWR 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 ADS7280IPWR reliable?
The price and inventory of ADS7280IPWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7280IPWR is usually 5 days.
3.What payment methods are accepted for ADS7280IPWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7280IPWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7280IPWR?
ADS7280IPWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7280IPWR 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 ADS7280IPWR?
For technical support, including ADS7280IPWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7280IPWR requirements.
6.How does Aetrix verify that ADS7280IPWR is sourced from the original manufacturer or authorized distributors?
All ADS7280IPWR 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 ADS7280IPWR meets industry standards.
7.What is the process for return or replacement of ADS7280IPWR?
All ADS7280IPWR units undergo pre-shipment inspection (PSI). If there is an issue with ADS7280IPWR, 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 ADS7280IPWR part is unused and in its original packaging.
Return procedure for ADS7280IPWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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