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Texas Instruments ADS7229IPW
- Part No.:
- ADS7229IPW
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
ADS7229IPW.pdf
- Description:
- IC ADC 12BIT SAR 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:174
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Product details
Overview
ADS7229IPW from Texas Instruments is a low-power, 12-bit, 1 MSPS successive approximation register (SAR) analog-to-digital converter with unipolar input range (0 V to VREF), built-in conversion clock, and SPI/DSP-compatible serial interface. It operates from 2.7 V to 5.5 V analog supply and delivers ±0.15 LSB typical INL, 73.9 dB SNR at 10 kHz, and 13.7 mW power dissipation at 3 V - ideal for precision transducer interface in industrial data acquisition systems.
For engineers reviewing the ADS7229IPW datasheet, ADS7229IPW pinout, ADS7229IPW application, or ADS7229IPW equivalent, key selection criteria include its single-ended unipolar input architecture, TSSOP-16 package with dedicated AGND/BDGND separation, programmable EOC/INT polarity, daisy-chain capability, and guaranteed no missing codes over –40°C to +85°C.
Technical Context
The ADS7229IPW implements a capacitor-based SAR ADC core with inherent sample-and-hold, supporting manual or auto-triggered conversions via CONVST and FS/CS. Its internal 21–24.5 MHz conversion clock eliminates external timing components, while the dual-supply architecture (+VA for analog, +VBD for I/O) enables flexible interfacing with 1.65 V to 5.5 V logic.
Conversion control is managed through a synchronous serial interface with SDI/SDO/SCLK, frame-sync support via FS/CS, and status signaling on EOC/INT/CDI - configurable as end-of-conversion flag, interrupt, or daisy-chain data input. The device supports global CONVST independent of chip select and software reset functionality.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output levels for high-fidelity signal digitization in measurement-critical applications. |
| Sampling Rate | 1 MSPS at +VA ≥ 3 V - enables real-time capture of signals up to ~400 kHz Nyquist bandwidth. |
| INL (Max) | ±0.5 LSB - ensures monotonicity and <0.012% full-scale linearity error for accurate sensor scaling. |
| SNR @ 10 kHz | 73.9 dB (5 V supply) - corresponds to ~2.5 µVRMS noise floor, suitable for 16-bit-equivalent effective resolution in narrowband systems. |
| Power Dissipation | 13.7 mW at 1 MSPS, +VA = 3 V, +VBD = 1.8 V - enables battery-powered or thermally constrained embedded designs. |
| Supply Range | +VA: 2.7–5.5 V; +VBD: 1.65–5.5 V - allows interoperability with mixed-voltage microcontrollers and FPGAs. |
| Operating Temp | –40°C to +85°C - fully specified for industrial-grade reliability without derating. |
Pinout & Package
TSSOP-16 package (PW designation), 4.4 mm × 5.0 mm body, 0.65 mm pitch, exposed thermal pad not internally connected to substrate - recommended to connect to AGND for optimal thermal performance and noise immunity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +VA (Pin 1) | Analog supply | Primary analog domain power; must be decoupled locally to AGND to minimize sampling noise. |
| +VBD (Pin 16) | Digital I/O supply | Independent buffer supply enabling level-shifting between analog and digital domains. |
| AGND (Pin 5) | Analog ground | Reference return for analog inputs, reference, and +VA; must be separated from BDGND by layout. |
| BDGND (Pin 14) | Digital interface ground | Return path for SCLK, SDI, SDO, FS/CS - prevents digital switching noise from coupling into analog section. |
| +IN (Pin 3) | Noninverting analog input | Single-ended unipolar input node; accepts 0 V to VREF; requires external anti-aliasing filter for >400 kHz signals. |
| –IN (Pin 4) | Inverting analog input | Internally tied to AGND; defines common-mode reference point for differential input stage. |
| REF+ (Pin 7) | External reference input | Accepts 0.3 V to +VA; determines full-scale range; requires low-noise, stable voltage source (e.g., REF5025). |
| REF– (Pin 6) | Reference ground | Must connect directly to AGND via low-inductance path to avoid reference gain errors. |
| CONVST (Pin 9) | Conversion start trigger | Edge-sensitive input that freezes sample-and-hold and initiates conversion on next internal clock edge. |
| FS/CS (Pin 11) | Frame sync / chip select | Active-low SPI slave select; also serves as frame sync for TI C2000 DSP interfaces. |
| SCLK (Pin 15) | Serial clock input | Supports up to 50 MHz externally; drives both interface timing and internal conversion clock when shared. |
| SDI (Pin 12) | Serial data input | Accepts configuration commands (e.g., EOC polarity, TAG bit enable) and software reset instruction. |
| SDO (Pin 13) | Serial data output | 3-state output delivering 16-bit straight-binary result MSB-first; tri-stated when CS high. |
| EOC/INT/CDI (Pin 10) | Status/data I/O | Configurable as active-low EOC flag, programmable-duration INT, or daisy-chain data input (CDI) in multi-device systems. |
| NC (Pin 8) | No connection | Unbonded pin; must remain floating or grounded per layout best practices - no electrical function. |
| RESERVED (Pin 2) | Reserved terminal | Internal test or future-use node; TI recommends connecting to AGND or +VA per datasheet guidance. |
Key Features
| Feature | Design Value |
|---|---|
| Built-in conversion clock (CCLK) | Eliminates need for external oscillator or clock divider, reducing BOM count and layout complexity in space-constrained systems. |
| Programmable EOC/INT polarity | Allows synchronization with either rising- or falling-edge triggered interrupt controllers without external inverters. |
| Dual independent ground pins (AGND/BDGND) | Enables physical separation of analog and digital return paths, critical for maintaining >73 dB SNR in mixed-signal PCBs. |
| Multi-chip daisy-chain mode | Permits cascading of multiple ADS7229IPW devices on a single SPI bus, reducing GPIO usage and simplifying firmware for channel expansion. |
| Global CONVST independent of CS | Supports simultaneous sampling across multiple converters even when individual CS lines are asserted at different times. |
Applications
| Industrial Process Control | Medical Instrumentation |
|---|---|
Use Scenario: Monitoring pressure, temperature, and flow sensors in PLC analog input modules with 4–20 mA loop interfaces. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned sensor outputs at 1 MSPS with deterministic latency (<200 ns aperture jitter). Use Value: ±0.5 LSB INL ensures <0.012% full-scale accuracy across temperature, meeting SIL-2 functional safety calibration requirements. | Use Scenario: Digitizing ECG, EEG, and pulse oximetry front-end signals in portable diagnostic devices. IC Role / Device Role / Timing Role: High-SNR ADC capturing low-amplitude bio-signals with minimal added noise (33 µVRMS). Use Value: 73.9 dB SNR at 10 kHz enables clean extraction of QRS complexes and P/T waves without oversampling or digital filtering overhead. |
| Data Acquisition Systems | Transducer Interface |
Use Scenario: Modular DAQ cards acquiring multi-channel voltage/current inputs in lab and field test equipment. IC Role / Device Role / Timing Role: Single-ended ADC with SPI interface enabling compact, FPGA-controlled acquisition engines. Use Value: Daisy-chain mode supports up to 8 devices on one SPI bus, reducing FPGA pin count and simplifying firmware channel management. | Use Scenario: Interfacing strain gauges, RTDs, and LVDTs in structural health monitoring and aerospace telemetry units. IC Role / Device Role / Timing Role: Precision ADC with programmable offset/gain compensation via external reference and digital calibration registers. Use Value: ±0.8 mV max offset error at 3 V supply ensures <10 µV baseline stability - critical for sub-microstrain resolution. |
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 |
|---|---|---|---|
| ADS7230IPW | Dual-channel 2:1 MUX input with programmable TAG bit; identical timing, power, and accuracy specs. | Requires channel sequencing logic; supports time-interleaved sampling but adds routing complexity for single-input use. | Select when multi-sensor multiplexing is needed; otherwise ADS7229IPW offers simpler layout and lower cost. |
| ADS8329IPWR | 16-bit resolution, 500 kSPS, higher SNR (86 dB), larger TSSOP-20 package, 2× power consumption at same throughput. | Targets ultra-high-precision applications where 12-bit resolution is insufficient; not drop-in compatible due to pin count and timing differences. | Choose only if >12-bit ENOB is required; ADS7229IPW remains optimal for cost-sensitive 12-bit systems needing 1 MSPS. |
Compared with ADS7230IPW, the ADS7229IPW reduces system complexity by eliminating MUX control and channel arbitration, while matching all key dynamic and DC specs - making it the preferred choice for single-input, high-throughput industrial sensing. Against ADS8329IPWR, it trades resolution for speed, power, and footprint - aligning better with real-time control loops.
Availability
ADS7229IPW is available at Aetrix Electronics and suitable for industrial process control, medical instrumentation, data acquisition systems, and transducer interface applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for ADS7229IPW 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 expertise in precision data converters and industrial-grade IC design.
The ADS7229IPW belongs to TI's low-power, high-speed SAR ADC family targeting industrial and medical signal acquisition - engineered for robust operation across –40°C to +85°C with minimal external components and deterministic timing behavior.
FAQ
What is the maximum sampling rate of the ADS7229IPW under 3V analog supply conditions?
The ADS7229IPW 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 explicitly specified in the Electrical Characteristics tables for both 5 V and 1.8 V timing conditions, and applies identically to the ADS7229IPW TSSOP-16 variant.
Does the ADS7229IPW support true differential input operation?
No, the ADS7229IPW does not support true differential input. It is a single-ended unipolar ADC with +IN and –IN terminals, where –IN is internally referenced to AGND and used only to define the common-mode point. The input range is strictly 0 V to VREF, and the device lacks programmable gain or differential input mode - unlike the pin-compatible ADS7230IPW, which includes a 2:1 MUX but still operates unipolar-only.
Can the ADS7229IPW operate with separate analog and digital ground planes?
Yes, the ADS7229IPW is explicitly designed for split-ground layouts: AGND (Pin 5) serves the analog domain (inputs, reference, +VA), while BDGND (Pin 14) serves the digital interface (SCLK, SDI, SDO, FS/CS). TI's datasheet mandates physical separation of these grounds with a single-point connection near the device to prevent digital noise from degrading SNR - a requirement validated by its 73.9 dB SNR performance.
What is the purpose of the RESERVED pin (Pin 2) on the ADS7229IPW?
The RESERVED pin (Pin 2) on the ADS7229IPW is an internal test or future-function terminal with no defined user role. Texas Instruments' datasheet specifies that it should be connected to either AGND or +VA - not left floating - to ensure predictable device behavior and avoid potential ESD susceptibility. This recommendation appears in the Terminal Functions table and is consistent across all ADS7229 packaging variants.
Is the ADS7229IPW compatible with standard SPI mode 0 (CPOL = 0, CPHA = 0)?
Yes, the ADS7229IPW supports SPI mode 0: SCLK idles low (CPOL = 0), and data is sampled on the rising edge (CPHA = 0). Timing diagrams confirm SDO valid setup after falling SCLK edge, and SDI setup/hold relative to falling SCLK - matching standard mode 0 waveforms. The device also supports TI's TMS320 DSP frame-sync protocol via FS/CS, but SPI mode 0 is the default and most widely used interface configuration for the ADS7229IPW.
ADS7229IPW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS7229IPW FAQ
1.How can I place an order for ADS7229IPW through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7229IPW 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 ADS7229IPW reliable?
The price and inventory of ADS7229IPW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7229IPW is usually 5 days.
3.What payment methods are accepted for ADS7229IPW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7229IPW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7229IPW?
ADS7229IPW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7229IPW 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 ADS7229IPW?
For technical support, including ADS7229IPW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7229IPW requirements.
6.How does Aetrix verify that ADS7229IPW is sourced from the original manufacturer or authorized distributors?
All ADS7229IPW 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 ADS7229IPW meets industry standards.
7.What is the process for return or replacement of ADS7229IPW?
All ADS7229IPW units undergo pre-shipment inspection (PSI). If there is an issue with ADS7229IPW, 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 ADS7229IPW part is unused and in its original packaging.
Return procedure for ADS7229IPW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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