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Texas Instruments ADS7829IDRBTG4
- Part No.:
- ADS7829IDRBTG4
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-VDFN Exposed Pad
- Datasheet:
-
ADS7829IDRBTG4.pdf
- Description:
- IC ADC 12BIT SAR 8SON
- Quantity:
- Payment:
- Shipping:
Inventory:250
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Product details
Overview
ADS7829IDRBTG4 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 supply. It features ±2 LSB integral linearity error, 25 pF input capacitance, and operates from 2.7 V to 5.25 V supply voltage. Used in battery-powered data acquisition systems requiring low-power, high-precision sampling.
For engineers reviewing the ADS7829IDRBTG4 datasheet, ADS7829IDRBTG4 pinout, ADS7829IDRBTG4 application, or ADS7829IDRBTG4 equivalent, key selection criteria include guaranteed 12-bit no-missing-codes performance at 2.7 V, 125 kSPS throughput with 12-cycle conversion time, rail-to-rail pseudo-differential input range, ultra-low 3 µA shutdown current, and SON-8 package compatibility with space-constrained PCB layouts.
Technical Context
The ADS7829IDRBTG4 implements a capacitive redistribution SAR architecture fabricated on a 0.6 µm CMOS process, integrating a sample-and-hold function inherently. Conversion is initiated by CS/SHDN falling edge, with sampling occurring over 1.5 DCLOCK cycles before 12-cycle conversion completes.
It uses an external reference (50 mV to VCC), synchronous 3-wire serial interface (DOUT, DCLOCK, CS/SHDN), and delivers straight-binary 12-bit output MSB-first on DOUT synchronized to DCLOCK falling edges. Input leakage is ±1 µA, and analog inputs tolerate −0.2 V to (VCC + 0.2 V) for +In and −0.2 V to 1.0 V for −In.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - guarantees full-scale quantization with 4096 discrete levels and no missing codes across temperature. |
| Throughput Rate | 125 kSPS at VCC ≥ 2.7 V - supports real-time sampling of signals up to ~62.5 kHz Nyquist bandwidth. |
| Integral Linearity Error | ±2 LSB - limits end-point accuracy error to ±0.3 mV when VREF = 2.5 V, critical for precision sensor interfacing. |
| Supply Voltage Range | 2.7 V to 5.25 V - enables direct integration with 3.3 V or 5 V logic domains without level-shifting. |
| Power Down Current | 3 µA max - allows extended sleep intervals in battery-operated systems without compromising wake-up latency. |
| Input Capacitance | 25 pF - defines required source impedance < 2 kΩ for 12-bit settling within 1.5 DCLOCK cycles at 125 kSPS. |
| Reference Voltage Range | 50 mV to VCC - permits flexible scaling from low-voltage sensors (e.g., 100 mV bridge outputs) to full-rail references. |
Pinout & Package
ADS7829IDRBTG4 is housed in an 8-pin SON (PDSO) package measuring 3 mm × 3 mm, with wettable flank terminals for automated optical inspection. Pinout is validated per TI SLAS388 datasheet Figure 1 (top view).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF (Pin 1) | Reference voltage input | Sets full-scale analog input span; must be bypassed with 0.1 µF capacitor to minimize noise-induced code uncertainty. |
| +IN (Pin 2) | Noninverting analog input | Accepts signal from 0 V to VCC + 0.2 V; forms differential pair with –IN for common-mode rejection. |
| –IN (Pin 3) | Inverting analog input | Limited to –0.2 V to 1.0 V; used for remote ground sensing or small common-mode rejection, not full differential swing. |
| GND (Pin 4) | Analog/digital ground | Single ground plane required; separation from noisy digital returns prevents coupling into analog path. |
| CS/SHDN (Pin 5) | Chip select / shutdown control | Active-low CS initiates conversion; driven high to enter 3 µA shutdown mode, disabling analog and digital sections. |
| DOUT (Pin 6) | Serial data output | CMOS-level output (0 V to VCC), MSB-first, valid on DCLOCK falling edge; tri-states after CS rising edge. |
| DCLOCK (Pin 7) | Serial interface clock | Controls conversion timing and data transfer; minimum 10 kHz, maximum 2 MHz; duty cycle not critical if tH/tL ≥ 400 ns. |
| +VCC (Pin 8) | Power supply | Supplies both analog and digital circuitry; requires local 0.1 µF + 1 µF ceramic bypassing close to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail pseudo-differential input | Enables direct connection to transducer outputs spanning near ground to near supply, while rejecting small common-mode shifts via –IN grounding. |
| Micropower auto power-down | Consumes < 60 µW at 7.5 kHz sampling rate (2.7 V), achieved by spending >90% of time in shutdown between conversions. |
| SPI-compatible 3-wire serial interface | Eliminates need for dedicated ADC controller; interoperates with standard microcontroller SPI peripherals using only CS, DCLOCK, DOUT lines. |
| Ultra-small 3 × 3 mm SON-8 package | Reduces PCB area by >50% vs. SOIC-8; wettable flanks support AOI-based solder joint verification in high-reliability manufacturing. |
| Guaranteed specs at 2.7 V | Full 12-bit performance (no missing codes, ±2 LSB INL) is assured at minimum industrial supply voltage, simplifying low-voltage system design. |
Applications
| Battery-Powered Sensor Nodes | Isolated Industrial Data Acquisition |
|---|---|
Use Scenario: Remote environmental monitoring node powered by coin-cell battery, sampling thermistor and humidity sensor every 10 seconds. IC Role / Device Role / Timing Role: ADC digitizes conditioned analog sensor outputs with minimal quiescent current draw during sleep, waking only for precise 12-bit conversion bursts. Use Value: 3 µA shutdown current extends battery life beyond 5 years; 25 pF input capacitance allows direct interface to high-impedance sensor filters without buffer op-amps. | Use Scenario: DIN-rail mounted PLC analog input module acquiring 4–20 mA loop signals across galvanically isolated channels. IC Role / Device Role / Timing Role: Front-end ADC converts isolated current-to-voltage outputs with rail-to-rail input range accommodating varying loop drop voltages. Use Value: 2.7–5.25 V supply range matches isolated DC-DC output tolerances; ±2 LSB INL ensures <0.05% measurement uncertainty across 0–100°C operating range. |
| Portable Medical Instrumentation | Simultaneous Multichannel Sampling Systems |
Use Scenario: Handheld ECG device acquiring lead-II differential voltage with ultra-low power budget and strict EMC requirements. IC Role / Device Role / Timing Role: Pseudo-differential input rejects common-mode noise from body coupling; micropower operation minimizes thermal drift and self-heating. Use Value: 25 pF input capacitance reduces need for aggressive anti-alias filtering; 125 kSPS throughput supports oversampling for noise reduction without external decimation. | Use Scenario: Vibration analysis system capturing synchronized analog waveforms from 8 accelerometers at 100 kSPS per channel. IC Role / Device Role / Timing Role: One ADS7829IDRBTG4 per channel provides deterministic 12-cycle conversion timing, enabling precise inter-channel phase alignment. Use Value: Identical 12-bit resolution and timing behavior across all units ensures consistent FFT bin coherence; SON-8 footprint enables dense channel packing. |
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 |
|---|---|---|---|
| ADS7822U | 12-bit, 200 kSPS, SO-8 package, 5 V only, ±1 LSB INL, no shutdown mode | Higher speed but lacks micropower shutdown and 2.7 V operation; unsuitable for battery use | Select ADS7822U only when 5 V supply and >125 kSPS are mandatory and PCB area is unconstrained. |
| MAX11100ETE+ | 12-bit, 100 kSPS, 3 × 3 TDFN, 2.7–3.6 V, ±0.5 LSB INL, internal reference | Includes internal 2.048 V reference but lower throughput; better INL at cost of flexibility | Choose MAX11100ETE+ when reference stability is prioritized over external reference scaling and 125 kSPS is sufficient. |
Compared with ADS7822U and MAX11100ETE+, ADS7829IDRBTG4 uniquely balances 125 kSPS throughput, guaranteed 2.7 V operation, 3 µA shutdown, and external reference flexibility-making it optimal for space- and energy-constrained multichannel or portable systems where input range adaptability is essential.
Availability
ADS7829IDRBTG4 is available at Aetrix Electronics and suitable for battery-operated sensor nodes, isolated industrial data acquisition modules, and portable medical instrumentation requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for ADS7829IDRBTG4 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 precision data converters and low-power signal chain solutions.
The ADS7829IDRBTG4 belongs to TI's micropower SAR ADC product line, designed specifically for high-accuracy, low-quiescent-current data acquisition in space-constrained, battery-sensitive applications such as portable instrumentation and remote sensing.
FAQ
What is the minimum supply voltage for guaranteed 12-bit performance of the ADS7829IDRBTG4?
The ADS7829IDRBTG4 guarantees full 12-bit specifications-including no missing codes and ±2 LSB integral linearity-down to 2.7 V supply voltage. Operation below 2.7 V (as low as 2.0 V) is possible but degrades maximum sample rate to 75 kSPS and may affect linearity; ADS7829IDRBTG4 datasheet Section 6 specifies these derated conditions explicitly.
Does the ADS7829IDRBTG4 require an external reference, and what is its acceptable voltage range?
Yes, the ADS7829IDRBTG4 requires an external reference applied to the VREF pin. The reference voltage must be between 50 mV and VCC, inclusive. For example, with VCC = 3.3 V, VREF can range from 50 mV to 3.3 V. This wide range allows direct interfacing with low-output sensors or precision voltage references, and ADS7829IDRBTG4 maintains specified performance across this entire span.
How does the pseudo-differential input architecture of the ADS7829IDRBTG4 differ from true differential input?
The ADS7829IDRBTG4 accepts a pseudo-differential input: +IN swings rail-to-rail (0 V to VCC), while –IN is limited to –0.2 V to 1.0 V and is typically grounded or connected to a remote sense point. Unlike true differential ADCs, it does not sample –IN again mid-conversion, so common-mode rejection is limited to small offsets. This architecture simplifies sensor interfacing while retaining some noise immunity-confirmed in ADS7829IDRBTG4 datasheet Section 8.1.
What is the power consumption of the ADS7829IDRBTG4 at 125 kSPS with 2.7 V supply?
At 125 kSPS and 2.7 V supply, the ADS7829IDRBTG4 draws 350 µA typical quiescent current, equating to ≈945 µW total power. During active conversion, current peaks transiently; however, the device spends most time in low-power states. With optimized CS timing, average power drops significantly-for example, at 7.5 kHz sampling, ADS7829IDRBTG4 consumes only 20 µA, as documented in the SLAS388 datasheet Table 1.
Can the ADS7829IDRBTG4 interface directly with a 5 V microcontroller SPI port?
Yes, the ADS7829IDRBTG4 digital inputs (CS/SHDN, DCLOCK) accept logic levels up to 6 V regardless of VCC, allowing direct connection to 5 V microcontrollers without level shifters. However, its DOUT output swings 0 V to VCC-so if VCC = 2.7 V, the 2.7 V logic-high may not meet 5 V CMOS VIH minimum (2.0 V). In that case, a pull-up resistor to 5 V or buffer is recommended, as noted in ADS7829IDRBTG4 datasheet Section 8.3.
ADS7829IDRBTG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-VDFN Exposed Pad
- Packaging:
- Bulk
- 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:
- -
ADS7829IDRBTG4 FAQ
1.How can I place an order for ADS7829IDRBTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7829IDRBTG4 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 ADS7829IDRBTG4 reliable?
The price and inventory of ADS7829IDRBTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7829IDRBTG4 is usually 5 days.
3.What payment methods are accepted for ADS7829IDRBTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7829IDRBTG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7829IDRBTG4?
ADS7829IDRBTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7829IDRBTG4 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 ADS7829IDRBTG4?
For technical support, including ADS7829IDRBTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7829IDRBTG4 requirements.
6.How does Aetrix verify that ADS7829IDRBTG4 is sourced from the original manufacturer or authorized distributors?
All ADS7829IDRBTG4 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 ADS7829IDRBTG4 meets industry standards.
7.What is the process for return or replacement of ADS7829IDRBTG4?
All ADS7829IDRBTG4 units undergo pre-shipment inspection (PSI). If there is an issue with ADS7829IDRBTG4, 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 ADS7829IDRBTG4 part is unused and in its original packaging.
Return procedure for ADS7829IDRBTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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