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Texas Instruments ADS7230IRSAT
- Part No.:
- ADS7230IRSAT
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-VQFN Exposed Pad
- Datasheet:
-
ADS7230IRSAT.pdf
- Description:
- IC ADC 12BIT SAR 16QFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
ADS7230IRSAT from Texas Instruments is a 12-bit, 1-MSPS dual-channel unipolar successive-approximation register (SAR) analog-to-digital converter with integrated 2:1 multiplexer, SPI/DSP-compatible serial interface, and programmable TAG bit output. It operates from 2.7V to 5.5V analog supply, delivers ±0.5 LSB max INL/DNL, and supports daisy-chain mode for multi-ADC systems in industrial data acquisition.
For engineers reviewing the ADS7230IRSAT datasheet, ADS7230IRSAT pinout, ADS7230IRSAT application, or ADS7230IRSAT equivalent, key selection criteria include its dual-input MUX architecture, auto/manual channel select mode, 108 dB input channel isolation at 50 kHz, built-in conversion clock, and support for 4 × 4 QFN-16 packaging with thermal pad grounding flexibility.
Technical Context
The ADS7230IRSAT implements a capacitor-based SAR ADC core with inherent sample-and-hold, supporting both manual (CONVST-triggered) and auto-triggered conversion modes. Its dual-input MUX enables sequential sampling of +IN0 and +IN1 against COM, with programmable channel selection logic and TAG bit output indicating active channel identity.
It features three power-down states-deep, nap, and auto-nap-with current draw as low as 1 µA in deep power-down. The device uses separate analog (+VA) and digital I/O (+VBD) supplies, enabling mixed-voltage system interfacing while maintaining 73.9 dB SNR and 93.4 dB SFDR at 10 kHz input with 5 V reference.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes for high-fidelity signal digitization |
| Sampling Rate | 1 MSPS at +VA ≥ 3V - enables real-time capture of fast transients in sensor and control loops |
| INL / DNL | ±0.5 LSB max - ensures monotonicity and minimizes code-dependent measurement error in precision systems |
| Input Channel Isolation | 108 dB at 50 kHz - prevents crosstalk between +IN0 and +IN1 during multiplexed acquisition |
| Supply Range | +VA: 2.7–5.5 V; +VBD: 1.65–5.5 V - supports flexible rail assignment and low-voltage microcontroller interfacing |
| Power Dissipation | 13.7 mW at 1 MSPS, +VA = 3 V, +VBD = 1.8 V - enables thermally constrained embedded designs |
| Reference Input | VREF = 0.3 V to +VA - allows use of internal or external references including 2.5 V or 5 V sources |
Pinout & Package
The ADS7230IRSAT is housed in a 4 × 4 mm, 16-pin QFN package (RSA) with exposed thermal pad internally connected to substrate; pad may be tied to AGND or left floating but must remain isolated from digital ground.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: REF+ | External reference positive input | Accepts precision voltage reference (0.3 V to +VA); sets full-scale range for unipolar conversion |
| 2: NC | No internal connection | Must be left unconnected; no routing or pull-up/pull-down required |
| 3: CONVST | Conversion start trigger | Edge-sensitive input that freezes S/H and initiates conversion on next internal clock rising edge |
| 4: EOC/INT/CDI | Status and daisy-chain interface | Configurable as end-of-conversion flag, interrupt, or chain data input in multi-device configurations |
| 5: FS/CS | Frame sync / chip select | Active-low SPI slave select or TMS320 DSP frame sync; controls serial interface enable timing |
| 6: SDI | Serial data input | Accepts command bits for reset, channel select, polarity configuration, and TAG enable |
| 7: SDO | Serial data output | Tri-state output delivering 16-bit straight-binary result plus optional TAG bit in dual-channel mode |
| 8: BDGND | Digital interface ground | Return path for +VBD supply; must be separated from AGND to minimize noise coupling |
| 9: SCLK | Serial clock input | Accepts up to 50 MHz external clock; serves as I/O clock only or combined I/O + conversion clock |
| 10: +VBD | Digital I/O supply | Provides voltage for logic interface (1.65–5.5 V); independent of analog supply for level-shifting flexibility |
| 11: +VA | Analog supply | Powers SAR core, reference buffer, and input stage (2.7–5.5 V); directly impacts noise and linearity |
| 12: +IN1 | Second analog input | Noninverting input for second channel; sampled when TAG = 1 in auto-select mode |
| 13: +IN0 | First analog input | Noninverting input for primary channel; sampled when TAG = 0 in auto-select mode |
| 14: COM | Common inverting input | Shared reference node for both channels; typically tied to AGND or sensor common |
| 15: AGND | Analog ground | Primary return for analog circuitry; must be star-connected and isolated from BDGND |
| 16: REF− | Reference negative input | Connected to AGND via dedicated via; establishes reference midpoint for unipolar operation |
Key Features
| Feature | Design Value |
|---|---|
| Programmable TAG bit output | Indicates active input channel (+IN0 or +IN1) in auto-select mode, eliminating host-side channel tracking overhead |
| Auto/manual channel select mode | Enables seamless transition between fixed-channel polling and automatic round-robin sampling without firmware reconfiguration |
| Multi-chip daisy-chain capability | Allows cascading of multiple ADS7230 devices on single SPI bus, reducing GPIO count and PCB routing complexity |
| Built-in conversion clock (CCLK) | Eliminates need for external clock source; internal 21–24.5 MHz oscillator drives conversion timing deterministically |
| Three-tier power-down hierarchy | Deep (1 µA), nap (0.5 µA), and auto-nap (dynamic entry/exit) modes optimize energy use across idle, burst, and continuous sampling |
Applications
| Industrial Process Monitoring | Medical Sensor Interface |
|---|---|
Use Scenario: Continuous monitoring of pressure, temperature, and flow sensors in PLC-based control cabinets with limited board space and thermal budget. IC Role / Device Role / Timing Role: Dual-channel SAR ADC performing synchronized sampling of redundant sensor pairs with 108 dB channel isolation to reject common-mode interference. Use Value: Enables fault-tolerant sensing architecture using single ADS7230IRSAT instead of two discrete converters, reducing BOM cost and layout area by 35%. | Use Scenario: Digitizing outputs from low-noise biopotential electrodes (ECG, EMG) in portable diagnostic devices powered by single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Precision ADC acquiring differential bio-signals with ±0.5 LSB linearity and 73.9 dB SNR at 10 kHz, operating from 3 V supply to extend battery life. Use Value: Delivers clinical-grade accuracy while consuming only 13.7 mW at 1 MSPS, allowing >8-hour runtime on 500 mAh battery. |
| Magnetometer Data Acquisition | Automated Test Equipment (ATE) |
Use Scenario: High-speed digitization of triaxial magnetometer outputs in navigation-grade inertial measurement units (IMUs) requiring minimal inter-channel crosstalk. IC Role / Device Role / Timing Role: Dual-input ADC capturing orthogonal magnetic field components with 101 dB isolation at 100 kHz to preserve vector fidelity during dynamic motion. Use Value: Maintains heading accuracy within ±0.2° over full temperature range (–40°C to +85°C) due to <±0.8 mV offset error drift at 3 V. | Use Scenario: Embedded digitizer module in modular ATE platforms requiring deterministic timing, multi-unit synchronization, and minimal FPGA resource usage. IC Role / Device Role / Timing Role: SPI-configurable ADC supporting global CONVST triggering and daisy-chain readout for time-aligned sampling across 8+ channels. Use Value: Reduces test cycle time by 22% versus software-polling architectures through hardware-triggered, pipelined conversion and auto-TAG channel identification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7229IRSAT | Single-input (no MUX), identical core performance, same package and pinout except +IN1/COM pins repurposed | Lacks dual-channel capability; suitable only for single-sensor or differential-input systems | Select when only one analog input is required and board layout re-use of ADS7230 footprint is beneficial |
| ADS8328IPWR | 16-bit resolution, 500 kSPS, TSSOP-16, SPI interface, no built-in MUX or TAG bit | Higher resolution but lower speed and no channel management features; requires external MUX for dual inputs | Choose for applications demanding <1 LSB INL where throughput >500 kSPS is not required |
Compared with ADS7229IRSAT and ADS8328IPWR, the ADS7230IRSAT uniquely integrates dual-input multiplexing, auto-channel tagging, and daisy-chain support in a 1-MSPS 12-bit package-enabling compact, low-software-overhead sensor hubs without external logic or timing coordination.
Availability
ADS7230IRSAT is available at Aetrix Electronics and suitable for industrial process control, medical instrumentation, magnetometer interfaces, and automated test equipment requiring stable component supply and long-term manufacturability.
Supply support for ADS7230IRSAT 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 for industrial, automotive, and communications markets.
The ADS7230IRSAT belongs to TI's low-power, high-speed SAR ADC family designed specifically for precision data acquisition in space- and power-constrained embedded systems with multi-sensor requirements.
FAQ
What is the maximum sampling rate of the ADS7230IRSAT under 3V analog supply conditions?
The ADS7230IRSAT achieves a maximum sampling rate of 1 MSPS when the analog supply (+VA) is between 3.0 V and 5.5 V. At 2.7 V ≤ +VA < 3.0 V, the maximum rate drops to 900 kSPS due to internal clock limitations. This behavior is specified in the Electrical Characteristics table under the 2.7–3.6 V operating condition section and confirmed by timing diagrams showing tCONV = 18 CCLK cycles at fixed internal clock frequency.
Does the ADS7230IRSAT require an external reference voltage, or can it operate with an internal reference?
The ADS7230IRSAT requires an external reference voltage applied between REF+ and REF− pins; it does not include an internal reference. The reference input accepts voltages from 0.3 V to +VA, supporting common standards such as 2.5 V or 5 V. Reference input resistance is 40 kΩ, and proper decoupling near the REF+ pin is recommended to maintain SNR and linearity performance per the datasheet layout guidelines.
How does the TAG bit function in the ADS7230IRSAT, and how is it enabled?
The TAG bit in the ADS7230IRSAT is a programmable output appended to the 16-bit serial data word, indicating which input channel (+IN0 or +IN1) was sampled. It is enabled via configuration bits written to the device through the SDI interface during initialization. When auto channel select mode is active, TAG = 0 denotes +IN0 and TAG = 1 denotes +IN1, allowing the host processor to identify channel origin without additional control signaling or timing assumptions.
Can the ADS7230IRSAT be used in daisy-chain configuration, and what pin is used for chaining?
Yes, the ADS7230IRSAT supports daisy-chain operation using the EOC/INT/CDI pin as the chain data input (CDI). In this mode, the SDO of one device connects to the CDI (pin 4) of the next, enabling synchronous readout of multiple converters on a shared SPI bus. The first device's EOC/INT/CDI functions as the final output, while intermediate devices route data through CDI to maintain bit alignment across the chain.
What are the thermal pad grounding recommendations for the ADS7230IRSAT QFN package?
The thermal pad of the ADS7230IRSAT RSA package is internally connected to the substrate and may be tied to AGND or left floating-but must never be connected to BDGND or digital ground planes. TI recommends connecting it to AGND via multiple vias to improve thermal dissipation and reduce analog noise coupling. Separation from digital ground avoids ground-loop currents that degrade PSRR and offset stability, especially critical in high-resolution measurement applications.
ADS7230IRSAT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-VQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 12
- 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:
- 4.5V ~ 5.5V
- Voltage - Supply, Digital:
- 1.65V ~ 5.5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 16-QFN (4x4)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS7230IRSAT FAQ
1.How can I place an order for ADS7230IRSAT through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7230IRSAT 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 ADS7230IRSAT reliable?
The price and inventory of ADS7230IRSAT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7230IRSAT is usually 5 days.
3.What payment methods are accepted for ADS7230IRSAT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7230IRSAT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7230IRSAT?
ADS7230IRSAT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7230IRSAT 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 ADS7230IRSAT?
For technical support, including ADS7230IRSAT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7230IRSAT requirements.
6.How does Aetrix verify that ADS7230IRSAT is sourced from the original manufacturer or authorized distributors?
All ADS7230IRSAT 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 ADS7230IRSAT meets industry standards.
7.What is the process for return or replacement of ADS7230IRSAT?
All ADS7230IRSAT units undergo pre-shipment inspection (PSI). If there is an issue with ADS7230IRSAT, 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 ADS7230IRSAT part is unused and in its original packaging.
Return procedure for ADS7230IRSAT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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