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Texas Instruments ADS7229IRSAR
- Part No.:
- ADS7229IRSAR
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-VQFN Exposed Pad
- Datasheet:
-
ADS7229IRSAR.pdf
- Description:
- IC ADC 12BIT SAR 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,747
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Product details
Overview
ADS7229IRSAR from Texas Instruments is a low-power, 12-bit, 1-MSPS unipolar-input SAR analog-to-digital converter with built-in conversion clock, SPI/DSP-compatible serial interface, and industrial-grade operation (–40°C to +85°C). It delivers ±0.15 LSB typical INL, 73.9 dB SNR at 10 kHz, and 13.7 mW power dissipation at 3 V supply - used in precision transducer interfaces and medical instrumentation signal chains.
For engineers reviewing the ADS7229IRSAR datasheet, ADS7229IRSAR pinout, ADS7229IRSAR application, or ADS7229IRSAR equivalent, key selection considerations include its single-ended unipolar input architecture, 4 × 4 mm QFN-16 package, programmable EOC/INT polarity, daisy-chain capability, and dual-supply operation (+VA = 2.7–5.5 V, +VBD = 1.65–5.5 V).
Technical Context
The ADS7229IRSAR implements a capacitor-based successive approximation register (SAR) ADC with integrated sample-and-hold, supporting manual or auto-triggered conversions via CONVST and FS/CS control. Its internal 21–24.5 MHz conversion clock eliminates external timing components while enabling up to 1 MSPS throughput at +VA ≥ 3 V.
It features a dedicated unipolar input pair (+IN/–IN), reference inputs (REF+/REF–), and CMOS-level digital I/O with independent +VBD supply - allowing level-shifting between analog and digital domains. The device supports SPI mode 0/3 and TMS320 DSP frame-sync protocols via FS/CS and SCLK.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - provides 4096 discrete output codes for high-fidelity digitization of analog sensor signals. |
| Sampling Rate | 1 MSPS at +VA ≥ 3 V - enables real-time capture of fast-changing industrial or medical waveforms. |
| INL (Max) | ±0.5 LSB - ensures monotonicity and minimal code-dependent gain error across full-scale range. |
| SNR @ 10 kHz | 73.9 dB - supports >12-bit effective resolution for low-noise measurement applications. |
| Power Dissipation | 13.7 mW at 3 V (+VA), 1.8 V (+VBD) - suitable for battery-powered or thermally constrained systems. |
| Operating Temp | –40°C to +85°C - qualified for industrial process control and embedded instrumentation environments. |
| Reference Range | 0 V to VREF (0.3–5.5 V) - allows flexible scaling using external precision references or internal buffered sources. |
Pinout & Package
ADS7229IRSAR is packaged in a 4 × 4 mm, 16-pin QFN (RSA) with exposed thermal pad. Pin 1 is REF+ (REFIN); the thermal pad is internally connected to substrate and may be tied to AGND or left floating - but must remain isolated from digital ground.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REF+ (REFIN) | Reference input positive | Accepts external voltage reference (0.3–5.5 V); sets full-scale input range for unipolar conversion. |
| REF– | Reference input negative | Must be connected to AGND through individual via to minimize noise coupling into reference path. |
| +IN | Analog input noninverting | Main unipolar analog input; accepts 0 V to VREF relative to –IN (typically AGND). |
| –IN | Analog input inverting | Typically grounded; defines common-mode point and enables differential input configuration if needed. |
| CONVST | Conversion start trigger | Edge-sensitive input that freezes sample-and-hold and initiates conversion on next internal clock edge. |
| EOC/INT/CDI | Status/data I/O | Programmable as end-of-conversion flag (active-low default) or interrupt; serves as daisy-chain data input in multi-device configurations. |
| FS/CS | Frame sync / chip select | Enables SPI slave operation or TMS320 DSP interface; controls serial data transfer initiation and timing alignment. |
| SCLK | Serial clock input | Accepts up to 50 MHz external clock; synchronizes SDI/SDO transfers and optionally drives internal conversion clock. |
| SDI | Serial data input | Receives command bits for configuration (e.g., EOC polarity, TAG bit, channel select) and reset commands. |
| SDO | Serial data output | Outputs 16-bit straight-binary conversion result MSB-first; tri-state controlled by CS/FS deassertion. |
| +VA | Analog supply | 2.7–5.5 V supply powering analog core, reference buffer, and sample-and-hold circuitry. |
| +VBD | Interface supply | 1.65–5.5 V supply powering digital I/O drivers - enables level translation between host controller and ADC logic. |
| AGND | Analog ground | Return path for analog circuitry; must be separated from BDGND to prevent digital noise injection. |
| BDGND | Interface ground | Return path for digital I/O; connects to host system's digital ground plane. |
| NC | No connection | Pin 2 has no internal bond; must be left unconnected or tied to AGND per layout best practices. |
Key Features
| Feature | Design Value |
|---|---|
| Built-in conversion clock (CCLK) | Eliminates need for external timing source; internal 21–24.5 MHz oscillator enables deterministic 18-cycle conversion time. |
| Programmable EOC/INT polarity | Allows firmware to match active-high or active-low interrupt logic without external inverters or GPIO reconfiguration. |
| Daisy-chain mode support | Enables synchronous sampling across multiple ADS7229 devices using shared SCLK and cascaded SDO→SDI connections. |
| Multi-power-domain architecture | Independent +VA (analog) and +VBD (I/O) supplies allow interfacing with 1.8 V, 3.3 V, or 5 V controllers without level shifters. |
| Deep power-down mode | Reduces current draw to ≤1 µA - ideal for intermittent-sampling systems requiring ultra-low standby power. |
Applications
| Industrial Process Monitoring | Medical Sensor Signal Conditioning |
|---|---|
Use Scenario: Continuous digitization of 4–20 mA loop outputs, RTD bridge voltages, or pressure transducer signals in PLC analog input modules. IC Role / Device Role / Timing Role: Primary ADC front-end converting conditioned analog sensor outputs into precise 12-bit digital values synchronized to system clock. Use Value: ±0.5 LSB INL and 73.9 dB SNR ensure accurate representation of slow-varying industrial parameters over temperature. | Use Scenario: Acquisition of ECG, EEG, or pulse oximeter analog waveforms in portable diagnostic equipment. IC Role / Device Role / Timing Role: High-fidelity analog front-end ADC capturing biopotential signals with minimal added noise or distortion. Use Value: 13.7 mW power at 3 V enables extended battery life while maintaining >12-bit ENOB at 10 kHz input frequency. |
| Transducer Interface for Test Equipment | Data Acquisition in Harsh Environments |
Use Scenario: Integration into automated test equipment (ATE) for calibrating sensors, actuators, and analog subsystems. IC Role / Device Role / Timing Role: Precision measurement engine acquiring calibrated reference signals under controlled timing via CONVST and FS/CS. Use Value: Programmable status output and daisy-chain capability simplify synchronization across multi-channel ATE backplanes. | Use Scenario: Embedded monitoring in oil/gas downhole tools, motor drives, or railway signaling where wide temperature and supply variation occur. IC Role / Device Role / Timing Role: Robust ADC operating across –40°C to +85°C with supply rejection >78 dB to tolerate noisy industrial rails. Use Value: Dual-supply architecture (+VA/+VBD) maintains digital interface integrity even when analog rail sags during load transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7230IRSAR | Includes 2:1 MUX and programmable TAG bit; identical core performance and pinout except +IN0/+IN1/COM instead of +IN/–IN. | Required for dual-channel multiplexed acquisition; not drop-in for single-ended unipolar designs using –IN as AGND. | Select ADS7230IRSAR only when channel multiplexing or TAG-based data identification is needed. |
| ADS8329IPWR | 16-bit resolution, 500 kSPS, higher accuracy (±1 LSB INL), larger TSSOP-16 package; no built-in CCLK - requires external clock. | Suitable for high-precision static measurements (e.g., weigh scales, calibration standards); not optimal for dynamic 1 MSPS use cases. | Choose ADS8329IPWR when resolution >12-bit and sampling rate ≤500 kSPS suffices; avoid if internal clock or 1 MSPS is mandatory. |
Compared with ADS7230IRSAR and ADS8329IPWR, the ADS7229IRSAR uniquely balances 1 MSPS speed, integrated timing, compact QFN packaging, and true single-ended unipolar input simplicity - making it optimal for cost- and space-constrained industrial and medical signal chains demanding deterministic throughput.
Availability
ADS7229IRSAR is available at Aetrix Electronics and suitable for industrial process control, portable medical instrumentation, and transducer interface applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for ADS7229IRSAR 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 ADS7229IRSAR belongs to TI's precision SAR ADC product line, engineered for high-speed, low-power, and high-accuracy data acquisition in resource-constrained embedded systems operating across extended industrial temperatures.
FAQ
What is the maximum sampling rate of the ADS7229IRSAR and under what supply conditions?
The ADS7229IRSAR achieves a maximum sampling rate of 1 MSPS when the analog supply (+VA) is between 3.0 V and 5.5 V. At lower analog supplies (2.7 V ≤ +VA < 3.0 V), the maximum rate drops to 900 kSPS. This behavior is specified in the electrical characteristics tables and confirmed across both 5 V and 1.8 V timing sections of the datasheet. The ADS7229IRSAR uses an internal conversion clock, so no external clock source is required to achieve these rates.
Does the ADS7229IRSAR support daisy-chain configuration with other ADCs?
Yes, the ADS7229IRSAR supports daisy-chain operation using its EOC/INT/CDI pin as a chain data input and SDO as the serial output. When multiple ADS7229IRSAR devices are connected in series, a single SCLK and FS/CS signal can synchronize conversions across all units, with data shifted out sequentially. This mode is explicitly documented in the functional description and timing diagrams of the ADS7229IRSAR datasheet.
What are the valid voltage ranges for +VA and +VBD supplies on the ADS7229IRSAR?
The ADS7229IRSAR requires +VA (analog supply) between 2.7 V and 5.5 V, and +VBD (interface supply) between 1.65 V and 5.5 V - with +VBD allowed up to 1.5 × +VA when +VA < 3.6 V. These ranges are specified in the Electrical Characteristics tables for both 5 V and 1.8 V operating conditions. Operating the ADS7229IRSAR outside these limits risks parametric degradation or damage, as defined in the Absolute Maximum Ratings section.
Can the ADS7229IRSAR operate with an external reference voltage less than 2.5 V?
Yes, the ADS7229IRSAR supports external reference voltages from 0.3 V up to +VA, including values below 2.5 V. The datasheet specifies minimum VREF as 0.3 V across all operating conditions, and typical performance data (e.g., INL, SNR) is provided for both 2.5 V and 5 V references. However, full-scale input range becomes 0 V to VREF, so resolution in volts scales linearly with reference magnitude - a 1.25 V reference yields 305 µV/LSB instead of 1.22 mV/LSB at 5 V.
How does the power consumption of the ADS7229IRSAR compare between Nap and Deep Power-Down modes?
In Nap or Auto Nap mode, the ADS7229IRSAR draws 0.25–0.5 mA (at 2.7–3.6 V +VA), while in Deep Power-Down mode, it consumes only 0.001–1 µA - representing a reduction of over 1000×. Both modes retain register settings and require no reinitialization upon wake-up. The Deep Power-Down current is measured with all supplies active but internal clocks halted, making it ideal for battery-powered systems with infrequent sampling intervals. This behavior is verified in the Power-Supply Requirements section of the ADS7229IRSAR datasheet.
ADS7229IRSAR 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:
- 1
- Input Type:
- Pseudo-Differential, Single Ended
- Data Interface:
- SPI, DSP
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.7V ~ 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:
- -
ADS7229IRSAR FAQ
1.How can I place an order for ADS7229IRSAR through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7229IRSAR 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 ADS7229IRSAR reliable?
The price and inventory of ADS7229IRSAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7229IRSAR is usually 5 days.
3.What payment methods are accepted for ADS7229IRSAR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7229IRSAR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7229IRSAR?
ADS7229IRSAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7229IRSAR 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 ADS7229IRSAR?
For technical support, including ADS7229IRSAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7229IRSAR requirements.
6.How does Aetrix verify that ADS7229IRSAR is sourced from the original manufacturer or authorized distributors?
All ADS7229IRSAR 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 ADS7229IRSAR meets industry standards.
7.What is the process for return or replacement of ADS7229IRSAR?
All ADS7229IRSAR units undergo pre-shipment inspection (PSI). If there is an issue with ADS7229IRSAR, 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 ADS7229IRSAR part is unused and in its original packaging.
Return procedure for ADS7229IRSAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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