My Inquiry
My Account
Texas Instruments ADS7229IRSAT
- Part No.:
- ADS7229IRSAT
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-VQFN Exposed Pad
- Datasheet:
-
ADS7229IRSAT.pdf
- Description:
- IC ADC 12BIT SAR 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:194
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ADS7229IRSAT from Texas Instruments is a low-power, 12-bit, 1-MSPS unipolar-input successive approximation register (SAR) analog-to-digital converter with built-in conversion clock, SPI/DSP-compatible serial interface, and industrial temperature range (–40°C to +85°C). It features ±0.15 LSB typical INL, 73.9 dB SNR at 10 kHz, and operates from 2.7V to 5.5V analog supply - used in precision transducer interface and medical instrument signal chains.
For engineers reviewing the ADS7229IRSAT datasheet, ADS7229IRSAT pinout, ADS7229IRSAT application, or ADS7229IRSAT equivalent, key selection criteria include unipolar input range (0 V to VREF), deep power-down mode (1 µA), daisy-chain capability, and QFN-16 package compatibility with space-constrained industrial data acquisition systems.
Technical Context
The ADS7229IRSAT implements a capacitor-based SAR architecture with inherent 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 1 MSPS throughput at +VA ≥ 3 V.
It uses separate analog (+VA) and digital I/O (+VBD) supplies (1.65 V to 5.5 V), supports programmable EOC/INT polarity and TAG bit output, and provides dual power-down modes (Nap and Deep) for dynamic power management in battery-sensitive applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 part in 4096 quantization granularity for high-fidelity sensor digitization. |
| Sampling Rate | 1 MSPS at +VA = 3–5.5 V - enables real-time capture of fast transducer signals without undersampling. |
| INL (max) | ±0.5 LSB - ensures monotonicity and <0.012% full-scale linearity error across temperature. |
| SNR | 73.9 dB at fIN = 10 kHz - supports >12-bit effective resolution in low-noise signal conditioning paths. |
| Power Dissipation | 13.7 mW at 1 MSPS, +VA = 3 V, +VBD = 1.8 V - suitable for thermally constrained portable instrumentation. |
| Supply Range | +VA: 2.7–5.5 V; +VBD: 1.65–5.5 V - allows flexible rail assignment and mixed-voltage system integration. |
| Operating Temp | –40°C to +85°C - fully specified for industrial and medical environments without derating. |
Pinout & Package
ADS7229IRSAT is housed in a 4 × 4 mm, 16-pin QFN package (RSA) with exposed thermal pad internally connected to substrate. Pin 1 is REF+ (REFIN); pin 15 is AGND; pin 8 is BDGND; pin 11 is +VA; pin 10 is +VBD. Thermal pad may be connected to analog ground or left floating but must remain isolated from digital ground.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REF+ (REFIN) | External reference input | Accepts 0.3–5.5 V reference voltage; defines full-scale input range (0 V to VREF). |
| +IN / –IN | Differential analog input | +IN is noninverting input; –IN is inverting input (typically grounded for unipolar operation). |
| CONVST | Conversion start trigger | Edge-sensitive input that freezes sample-and-hold and initiates conversion on next internal clock edge. |
| FS/CS | Frame sync / chip select | Active-low SPI slave select; also serves as frame sync for TMS320 DSP interface. |
| SCLK | Serial clock input | Supports up to 50 MHz external clock; doubles as I/O clock and conversion clock when enabled. |
| SDO | Serial data output | Tri-state output delivering 12-bit straight-binary result MSB-first; supports daisy-chain mode. |
| EOC/INT/CDI | Status & chain data I/O | Programmable as end-of-conversion flag, interrupt, or daisy-chain data input (CDI) in multi-device configurations. |
| +VA / +VBD | Analog & I/O supplies | +VA powers analog core (2.7–5.5 V); +VBD powers digital interface (1.65–5.5 V) - enables voltage domain isolation. |
Key Features
| Feature | Design Value |
|---|---|
| Built-in conversion clock (CCLK) | 21–24.5 MHz internal oscillator eliminates need for external timing circuitry and reduces BOM count. |
| Multi-chip daisy-chain mode | Enables synchronous sampling across multiple ADS7229 devices using single SCLK and CS, reducing controller GPIO usage. |
| Programmable EOC/INT polarity | Allows firmware to configure active-high or active-low status signaling to match host processor interrupt logic. |
| Global CONVST (independent of CS) | Permits simultaneous sampling initiation across multiple converters regardless of individual chip-select states. |
| Comprehensive power-down modes | Deep power-down (1 µA) and Nap mode (0.3–0.5 mA) enable adaptive power scaling in intermittent-sampling applications. |
Applications
| Transducer Interface | Medical Instrumentation |
|---|---|
Use Scenario: Digitizing low-level outputs from strain gauges, RTDs, and pressure sensors in industrial PLC modules. IC Role / Device Role / Timing Role: Precision unipolar ADC capturing DC-coupled analog signals with <±0.5 LSB INL and 73.9 dB SNR. Use Value: Enables direct connection to ratiometric sensors without external amplification, reducing component count and offset drift. | Use Scenario: Acquiring biopotential signals (ECG, EEG) in portable diagnostic equipment with strict power budgets. IC Role / Device Role / Timing Role: Low-power 12-bit SAR ADC operating at 1 MSPS with deep power-down between samples. Use Value: Delivers clinical-grade resolution while consuming only 13.7 mW at 3 V, extending battery life in handheld units. |
| Industrial Process Control | Data Acquisition Systems |
Use Scenario: High-channel-count analog input modules in distributed control systems requiring synchronized sampling. IC Role / Device Role / Timing Role: Daisy-chain-capable ADC with global CONVST support for deterministic multi-channel acquisition. Use Value: Eliminates need for external synchronization logic; enables precise phase alignment across 8+ channels per bus. | Use Scenario: Modular DAQ cards for automated test equipment where throughput, noise floor, and SPI compatibility are critical. IC Role / Device Role / Timing Role: SPI-compatible 12-bit ADC with 50 MHz SCLK support and straight-binary output format. Use Value: Simplifies FPGA or microcontroller firmware integration and achieves 1 MSPS sustained rate without FIFO buffering. |
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 |
|---|---|---|---|
| ADS7230IRSAT | Dual-channel 2:1 MUX input, programmable channel select, identical pinout and timing. | Requires dual-input signal routing; adds channel sequencing overhead but enables shared ADC resource. | Select when multiplexed dual-sensor monitoring is needed; retains same PCB layout and firmware structure. |
| ADS8329IPWR | 16-bit resolution, 500 kSPS, higher SNR (86 dB), larger TSSOP-16 package, no internal CCLK. | Higher precision at lower speed; requires external clock and consumes more power (22 mW at 5 V). | Select when resolution >12 bits is mandatory and sampling rate ≤500 kSPS suffices; verify layout compatibility. |
Compared with ADS7229IRSAT, ADS7230IRSAT offers input multiplexing without sacrificing speed or power, while ADS8329IPWR trades throughput and integration for enhanced resolution - making ADS7229IRSAT optimal for cost- and size-sensitive 12-bit, 1-MSPS applications.
Availability
ADS7229IRSAT is available at Aetrix Electronics and suitable for industrial process control, medical instrumentation, and transducer interface applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ADS7229IRSAT 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 over 50 years of innovation in precision data converters.
The ADS7229 is part of TI's low-power, high-speed SAR ADC family designed for industrial, medical, and test equipment where accuracy, power efficiency, and serial interface simplicity are critical.
FAQ
What is the maximum sampling rate of the ADS7229IRSAT under 3V analog supply?
The ADS7229IRSAT 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 - confirmed in the Electrical Characteristics table for 2.7–3.6 V operation. This behavior is inherent to the internal CCLK generation circuitry and does not require external clock configuration. The ADS7229IRSAT maintains full 12-bit performance across both ranges.
Does the ADS7229IRSAT support true differential input operation?
No, the ADS7229IRSAT supports unipolar differential input only: the input range is defined as 0 V to VREF, with +IN and –IN forming a pseudo-differential pair where –IN is typically tied to AGND. It lacks programmable input polarity, bipolar range, or independent –IN voltage handling beyond AGND ±0.2 V. True differential operation (e.g., ±VREF range) is not supported - this is explicitly stated in the device description and functional diagram. For fully differential input capability, consider the ADS7230IRSAT or higher-resolution TI SAR ADCs.
Can the ADS7229IRSAT operate with separate analog and digital ground planes?
Yes, the ADS7229IRSAT supports split-ground architecture: AGND (pin 15) is dedicated to analog circuitry, while BDGND (pin 8) serves the digital I/O interface. TI's datasheet recommends keeping these grounds separate and connecting them at a single point near the device to minimize noise coupling. The thermal pad may be connected to AGND or left floating but must never be tied to BDGND - doing so degrades PSRR and increases digital switching noise on the analog path. This separation is essential for achieving the specified 73.9 dB SNR.
What is the function of the RESERVED pin (pin 12) on the ADS7229IRSAT QFN package?
The RESERVED pin (pin 12) on the ADS7229IRSAT RSA package is an internal node with no functional connection in this device variant. TI's Terminal Functions table specifies it must be connected either to AGND or +VA - floating is not permitted. This connection stabilizes internal bias networks and prevents undefined behavior during power-up or ESD events. Unlike NC pins, RESERVED requires a deliberate DC tie; failure to connect it may cause startup failures or increased offset drift, particularly at temperature extremes.
How does the daisy-chain mode work on the ADS7229IRSAT, and what pins are involved?
Daisy-chain mode on the ADS7229IRSAT uses the EOC/INT/CDI pin (pin 4) as a chain data input (CDI) and SDO (pin 7) as the chain data output. In this configuration, multiple ADS7229IRSAT devices share one SCLK and FS/CS line; the first device's SDO connects to the second's CDI, and so on. Each device outputs its 12-bit result sequentially on the same SDO line after conversion, enabling synchronized multi-channel capture with minimal controller resources. The mode requires setting the TAG bit and configuring EOC/INT/CDI as CDI via SPI command - no hardware changes beyond inter-device wiring are needed.
ADS7229IRSAT 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:
- -
ADS7229IRSAT FAQ
1.How can I place an order for ADS7229IRSAT through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7229IRSAT 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 ADS7229IRSAT reliable?
The price and inventory of ADS7229IRSAT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7229IRSAT is usually 5 days.
3.What payment methods are accepted for ADS7229IRSAT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7229IRSAT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7229IRSAT?
ADS7229IRSAT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7229IRSAT 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 ADS7229IRSAT?
For technical support, including ADS7229IRSAT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7229IRSAT requirements.
6.How does Aetrix verify that ADS7229IRSAT is sourced from the original manufacturer or authorized distributors?
All ADS7229IRSAT 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 ADS7229IRSAT meets industry standards.
7.What is the process for return or replacement of ADS7229IRSAT?
All ADS7229IRSAT units undergo pre-shipment inspection (PSI). If there is an issue with ADS7229IRSAT, 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 ADS7229IRSAT part is unused and in its original packaging.
Return procedure for ADS7229IRSAT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADS7229IRSAT Tags
-
ADC081C021CIMKX/NOPB
Texas Instruments
-
MCP3021A5T-E/OT
Microchip Technology
-
TLA2024IRUGR
Texas Instruments
-
MCP3221A5T-E/OT
Microchip Technology
-
MCP3221A5T-I/OT
Microchip Technology
-
MCP3221A4T-E/OT
Microchip Technology
-
MCP3221A6T-E/OT
Microchip Technology
-
MCP3221A0T-E/OT
Microchip Technology
-
MCP3221A1T-E/OT
Microchip Technology
-
ADC121S021CIMFX/NOPB
Texas Instruments
-
MCP3001-I/MS
Microchip Technology
-
MCP3001-I/SN
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
