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Texas Instruments ADS7829IBDRBR
- Part No.:
- ADS7829IBDRBR
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-VDFN Exposed Pad
- Datasheet:
-
ADS7829IBDRBR.pdf
- Description:
- IC ADC 12BIT SAR 8SON
- Quantity:
- Payment:
- Shipping:
Inventory:3,604
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Product details
Overview
ADS7829IBDRBR from Texas Instruments is a 12-bit, 125 kSPS successive approximation register (SAR) analog-to-digital converter with pseudo-differential rail-to-rail input, SPI-compatible serial interface, and micropower operation at 2.7 V. It features ±1.25 LSB integral linearity error, 72 dB SINAD at 1 kHz, and operates from 2.0 V to 5.25 V supply. It is used in battery-powered data acquisition systems requiring high resolution and low quiescent current.
For engineers reviewing the ADS7829IBDRBR datasheet, ADS7829IBDRBR pinout, ADS7829IBDRBR application, or ADS7829IBDRBR equivalent, key selection considerations include its 12-bit resolution with guaranteed INL/DNL at 2.7 V, 8-pin SON package footprint, 125 kSPS throughput, micropower shutdown mode (3 µA), and rail-to-rail pseudo-differential input architecture.
Technical Context
The ADS7829IBDRBR implements a capacitive redistribution SAR architecture with integrated sample-and-hold, fabricated in 0.6 µm CMOS. It acquires input voltage differentially between +In and –In pins, holds the sampled value on an internal capacitor array, and performs binary search conversion synchronized to an external DCLOCK signal.
Its serial interface outputs 12-bit straight-binary data MSB-first on DOUT, triggered by CS/SHDN falling edge and clocked on DCLOCK falling edges. The device enters auto power-down when CS/SHDN is high, disabling both analog and digital sections to achieve 3 µA max current draw.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes with monotonic transfer function and no missing codes. |
| Sample Rate | 125 kSPS at VCC ≥ 2.7 V - supports real-time acquisition of signals up to ~62.5 kHz Nyquist bandwidth. |
| INL / DNL | ±1.25 / –1 to +1.25 LSB - ensures accurate amplitude representation and minimal code-width variation across full scale. |
| SINAD | 72 dB at 1 kHz, 2.5 Vpp - corresponds to ~11.7 effective number of bits (ENOB) for precision measurement applications. |
| Supply Range | 2.0 V to 5.25 V - enables direct interfacing with 2.5 V, 3.3 V, or 5 V logic and mixed-voltage systems. |
| Power Down Current | 3 µA max - reduces system-level standby power in portable or energy-harvesting designs. |
| Reference Range | 50 mV to VCC - allows flexible scaling of input range using internal or external reference sources. |
Pinout & Package
ADS7829IBDRBR is housed in an 8-pin 3 × 3 mm PDSO (SON) package, same footprint as QFN, with wettable flanks for automated optical inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Vref (Pin 1) | Reference voltage input | Sets full-scale analog input span; accepts 50 mV–VCC; requires local 0.1 µF bypass. |
| +In (Pin 2) | Noninverting analog input | Rail-to-rail input node; accepts –0.2 V to VCC + 0.2 V; sampled during tSAMPLE = 1.5 DCLOCK cycles. |
| –In (Pin 3) | Inverting analog input | Limited to –0.2 V to 1.0 V; used for remote ground sensing or common-mode rejection of small offsets. |
| GND (Pin 4) | Analog/digital ground | Single ground connection; requires low-impedance path to minimize noise coupling into SAR core. |
| CS/SHDN (Pin 5) | Chip select / shutdown control | Active-low conversion trigger; HIGH forces full power-down (3 µA), LOW initiates sampling and serial output. |
| DOUT (Pin 6) | Serial data output | CMOS output (0–VCC); outputs 12-bit MSB-first data after null bit; tri-states on CS rising edge. |
| DCLOCK (Pin 7) | External data clock input | Synchronizes conversion timing and serial output; falling edge clocks valid data; min 10 kHz, max 2 MHz. |
| +VCC (Pin 8) | Power supply | Supplies analog and digital sections; requires local 0.1 µF ceramic decoupling close to pin. |
Key Features
| Feature | Design Value |
|---|---|
| 12-bit SAR with no missing codes | Guarantees monotonicity and predictable code transitions across full temperature range (–40°C to +85°C). |
| Pseudo-differential rail-to-rail input | Supports single-ended or differential measurements without external op-amps; –In pin extends dynamic range via remote ground sensing. |
| SPI-compatible 3-wire serial interface | Eliminates need for parallel bus; reduces PCB routing complexity and I/O count on microcontrollers. |
| Micropower auto power-down | Draws <60 µW at 7.5 kHz sample rate (2.7 V), enabling multi-year battery life in remote sensor nodes. |
| Ultra-small 3 × 3 mm SON package | Enables high-density PCB layouts in space-constrained applications such as wearable medical devices and IoT edge sensors. |
Applications
| Battery Operated Systems | Remote Data Acquisition |
|---|---|
Use Scenario: Portable handheld multimeter acquiring voltage, current, and temperature readings over extended periods on coin-cell or AA batteries. IC Role / Device Role / Timing Role: Primary ADC digitizing sensor outputs with 12-bit resolution and low idle current to maximize runtime. Use Value: 3 µA shutdown current and <60 µW active power at 7.5 kHz enable >5-year battery life without compromising measurement fidelity. | Use Scenario: Wireless environmental sensor node deployed in agricultural fields measuring soil moisture, pH, and ambient temperature. IC Role / Device Role / Timing Role: High-accuracy analog front-end ADC interfaced to low-power MCU and sub-GHz RF transceiver. Use Value: Rail-to-rail pseudo-differential input rejects ground shifts across long sensor cables; 125 kSPS supports burst-mode sampling before RF transmission. |
| Isolated Data Acquisition | Simultaneous Sampling, Multichannel Systems |
Use Scenario: Medical patient monitor isolating ECG/EEG analog inputs from digital processing unit using optocouplers or digital isolators. IC Role / Device Role / Timing Role: Isolated-side ADC converting biopotential signals with minimal added noise and offset drift. Use Value: Low 33 µVrms noise and ±1.25 LSB INL ensure diagnostic-grade signal integrity; 2.0 V minimum supply supports isolated DC-DC biasing. | Use Scenario: Industrial motor drive controller synchronously sampling phase currents and bus voltage for field-oriented control (FOC). IC Role / Device Role / Timing Role: One of multiple ADS7829IBDRBR units sharing common DCLOCK and CS timing to capture simultaneous analog snapshots. Use Value: Identical 12-bit resolution and 125 kSPS throughput across channels enable precise time-aligned current/voltage reconstruction for torque estimation. |
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 |
|---|---|---|---|
| ADS7829IDRBR | ±2 LSB INL vs. ±1.25 LSB for IB grade; otherwise identical specs and pinout. | Acceptable where 12-bit accuracy tolerance is relaxed (e.g., non-critical industrial monitoring). | Select ADS7829IDRBR for cost-sensitive designs where ±2 LSB INL meets system requirements. |
| ADS8325IBDBR | 16-bit, 100 kSPS, SPI interface, 2.7–5.5 V supply; higher resolution but lower speed and larger 10-pin VSSOP package. | Suitable for high-precision instrumentation (e.g., portable oscilloscopes) where resolution outweighs speed and size constraints. | Choose ADS8325IBDBR when ENOB >12 bits is required and 100 kSPS suffices; verify layout compatibility with larger footprint. |
Compared with ADS7829IDRBR, the ADS7829IBDRBR offers tighter INL for critical measurement accuracy; compared with ADS8325IBDBR, it trades resolution for smaller size, lower power, and higher throughput-making it optimal for compact, battery-powered multichannel systems.
Availability
ADS7829IBDRBR is available at Aetrix Electronics and suitable for battery operated systems, remote data acquisition modules, isolated medical sensors, and simultaneous multichannel motor control requiring stable component supply and guaranteed performance across –40°C to +85°C.
Supply support for ADS7829IBDRBR 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 specializing in analog and embedded processing technologies, with leadership in data converters, power management, and signal chain solutions.
The ADS7829IBDRBR belongs to TI's micropower SAR ADC family designed for ultra-low-power, high-resolution data acquisition in space- and energy-constrained applications including portable instrumentation and distributed sensing.
FAQ
What is the maximum DCLOCK frequency supported by the ADS7829IBDRBR?
The ADS7829IBDRBR supports a maximum DCLOCK frequency of 2 MHz. This enables its full 125 kSPS throughput, as each conversion requires 16 DCLOCK cycles (tCYC). Operation above 2 MHz is not guaranteed and may result in incorrect sampling or data corruption. At lower sample rates, the device spends more time in power-down mode, reducing average current consumption.
Does the ADS7829IBDRBR require an external reference voltage?
Yes, the ADS7829IBDRBR requires an external reference voltage applied to the Vref pin. It accepts any stable voltage from 50 mV to VCC, allowing flexible input range scaling. The reference must be bypassed with a 0.1 µF ceramic capacitor placed close to the Vref pin. Internal reference is not provided; accuracy and noise performance depend directly on the quality of the external reference source.
How does the pseudo-differential input architecture of the ADS7829IBDRBR work?
The ADS7829IBDRBR's pseudo-differential input uses +In and –In pins to measure the voltage difference between them, but –In is not fully differential-it is limited to –0.2 V to 1.0 V and is typically tied to remote ground or a stable bias point. This configuration rejects common-mode noise on long sensor leads while maintaining rail-to-rail input swing on +In. It avoids the need for external instrumentation amplifiers in many single-supply sensor interfaces.
What is the significance of the "IB" grade in ADS7829IBDRBR?
The "IB" grade in ADS7829IBDRBR denotes improved linearity performance: ±1.25 LSB integral nonlinearity (INL) and –1/+1.25 LSB differential nonlinearity (DNL) over –40°C to +85°C, versus ±2 LSB INL for the standard "I" grade (ADS7829IDRBR). This tighter specification ensures higher measurement accuracy in precision applications such as portable test equipment and calibrated sensor systems.
Can the ADS7829IBDRBR operate from a 2.0 V supply?
Yes, the ADS7829IBDRBR operates from 2.0 V to 5.25 V. However, at VCC < 2.7 V, maximum sample rate is reduced to 75 kSPS, and reference voltage must be limited to 1.024 V–1.25 V for assured specifications. Full 125 kSPS performance and guaranteed INL/DNL are only specified at VCC ≥ 2.7 V. System designers must validate timing and noise performance under 2.0 V operation using actual hardware.
ADS7829IBDRBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-VDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 125k
- Number of Inputs:
- 1
- Input Type:
- Pseudo-Differential
- Data Interface:
- SPI
- 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 ~ 5.25V
- Voltage - Supply, Digital:
- 2.7V ~ 5.25V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-SON (3x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS7829IBDRBR FAQ
1.How can I place an order for ADS7829IBDRBR through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7829IBDRBR 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 ADS7829IBDRBR reliable?
The price and inventory of ADS7829IBDRBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7829IBDRBR is usually 5 days.
3.What payment methods are accepted for ADS7829IBDRBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7829IBDRBR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7829IBDRBR?
ADS7829IBDRBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7829IBDRBR 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 ADS7829IBDRBR?
For technical support, including ADS7829IBDRBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7829IBDRBR requirements.
6.How does Aetrix verify that ADS7829IBDRBR is sourced from the original manufacturer or authorized distributors?
All ADS7829IBDRBR 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 ADS7829IBDRBR meets industry standards.
7.What is the process for return or replacement of ADS7829IBDRBR?
All ADS7829IBDRBR units undergo pre-shipment inspection (PSI). If there is an issue with ADS7829IBDRBR, 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 ADS7829IBDRBR part is unused and in its original packaging.
Return procedure for ADS7829IBDRBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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