My Inquiry
My Account
Texas Instruments ADS8634SRGET
- Part No.:
- ADS8634SRGET
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
ADS8634SRGET.pdf
- Description:
- IC ADC 12BIT SAR 24VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:260
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ADS8634SRGET from Texas Instruments is a 12-bit, 4-channel, bipolar-input SAR analog-to-digital converter with software-selectable input ranges (±10V, ±5V, ±2.5V, 0–10V, 0–5V), 1MSPS throughput, integrated multiplexer, internal 2.5V reference, temperature sensor, and digital comparator - used in industrial PLC analog input modules for high-voltage sensor signal digitization.
For engineers reviewing the ADS8634SRGET datasheet, ADS8634SRGET pinout, ADS8634SRGET application, or ADS8634SRGET equivalent, this page delivers verified specifications, QFN-24 package layout, real-world industrial use cases, and validated alternative parts for precision analog acquisition systems requiring extended temperature operation (–40°C to +125°C) and ±12V input support with external reference.
Technical Context
The ADS8634SRGET employs a successive approximation register (SAR) architecture with no conversion latency and a sample-and-hold front-end optimized for high-impedance industrial sensor interfaces. Its 4-channel analog multiplexer supports independent range selection per channel via SPI configuration.
It integrates a 2.5V internal voltage reference (±1.2% initial accuracy, 20ppm/°C drift), an on-chip temperature sensor (±5% FSR accuracy), and per-channel digital comparators with programmable alarm thresholds - enabling autonomous over-range detection without host processor intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits with no missing codes - guarantees monotonicity and full code coverage across all operating conditions. |
| Sampling Rate | 1 MSPS maximum throughput - supports closed-loop control and high-speed data logging at microsecond-scale timing. |
| Input Ranges | Software-selectable ±10V, ±5V, ±2.5V, 0–10V, 0–5V - eliminates external gain/attenuation circuitry for multi-sensor systems. |
| INL / DNL | ±0.9 LSB / +0.9/–0.5 LSB - ensures <0.02% linearity error for precision measurement in process control transmitters. |
| SNR | 71.8 dB at 1 kHz - enables >11.6 effective number of bits (ENOB) for accurate representation of low-amplitude signals. |
| Supply Voltages | HVDD/HVSS = ±10V to ±15V; AVDD = 2.7–5.25V; DVDD = 1.65–5.25V - supports direct connection to industrial ±12V rails and low-voltage logic. |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive sensors, motor drives, and harsh-environment factory automation. |
Pinout & Package
The ADS8634SRGET is housed in a 4mm × 4mm QFN-24 package with exposed thermal pad (RGE suffix), optimized for compact industrial PCB layouts and thermal dissipation in sealed enclosures.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN0–AIN3 | Analog input channels | Four differential-capable inputs accepting bipolar/unipolar ranges up to ±10V; referenced to AINGND. |
| AINGND | Analog input ground sense | Common return for all analog inputs; must be routed separately from AGND to minimize crosstalk in noisy environments. |
| AVDD / AGND | Analog power supply | Provides clean analog bias for ADC core and mux; requires local 10µF + 0.1µF decoupling per TI layout guidelines. |
| HVDD / HVSS | High-voltage mux supply | Independent ±10V to ±15V rails powering the input multiplexer - enables true ±12V input capability with external reference. |
| REF / REFGND | Reference interface | Accepts internal 2.5V ref or external reference (2.0–3.0V); REFGND is dedicated decoupling node for reference stability. |
| CS / SCLK / DIN / DOUT | SPI interface | 4-wire SPI-compatible serial interface (mode 0, CPHA=0, CPOL=0); supports daisy-chaining and simultaneous readback of alarm status. |
| AL_PD | Alarm output / Power-down input | Configurable dual-function pin: active-high alarm indicator or active-low asynchronous power-down trigger. |
| DVDD / DGND | Digital I/O supply | 1.65–5.25V logic interface compatible with 1.8V, 3.3V, and 5V microcontrollers - no level-shifting required. |
Key Features
| Feature | Design Value |
|---|---|
| No-latency SAR conversion | Eliminates pipeline delay - critical for real-time feedback in servo drives and digital power supplies where deterministic timing is mandatory. |
| Per-channel digital comparator | Reduces host CPU load by autonomously flagging out-of-range events on any input, enabling interrupt-driven fault response. |
| Integrated temperature sensor | Monitors die temperature with ±5% FSR accuracy - supports thermal derating and self-calibration routines without external components. |
| Flexible power-down mode | Reduces total supply current to ≤10 µA (DVDD) and ≤5 µA (HVDD/HVSS) - extends uptime in battery-backed data loggers. |
| Extended industrial temperature range | Guaranteed performance from –40°C to +125°C - avoids derating or thermal throttling in uncooled control cabinets. |
Applications
| Industrial Process Control (PLC) | Data Acquisition Systems |
|---|---|
Use Scenario: Analog input module in modular PLC rack acquiring signals from pressure, temperature, and flow transmitters in chemical plants. IC Role / Device Role / Timing Role: Primary ADC for four 4–20mA or ±10V field signals with per-channel range selection and alarm monitoring. Use Value: Eliminates external op-amp conditioning and reference ICs, reducing BOM count by ≥3 components per channel while maintaining ±0.02% measurement accuracy. | Use Scenario: Portable vibration analyzer capturing accelerometer outputs across multiple axes in rotating machinery. IC Role / Device Role / Timing Role: Simultaneous sampling front-end with 1MSPS sustained rate and low THD (–80dB) for spectral integrity. Use Value: Enables FFT-based fault detection up to 50kHz with >11.6 ENOB, meeting ISO 10816-3 vibration severity classification requirements. |
| High-Speed Closed-Loop Systems | Digital Power Supplies |
Use Scenario: Current/voltage sensing in servo motor drives requiring sub-microsecond loop update times. IC Role / Device Role / Timing Role: Real-time feedback ADC with no conversion latency and deterministic 1µs acquisition window. Use Value: Supports 500kHz PWM switching with synchronized sampling, preventing aliasing and enabling predictive current limiting. | Use Scenario: Input/output monitoring in telecom rectifiers and server VRMs where efficiency and reliability are critical. IC Role / Device Role / Timing Role: Dual-role ADC for sensing both AC input voltage and DC output rail with independent range programming. Use Value: Enables adaptive overvoltage protection using internal comparator alarms, reducing system response time to <100ns vs. MCU polling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar analog-to-digital conversion applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8638SRGET | 8-channel variant in identical QFN-24 package; shares same resolution, speed, reference, and feature set. | Supports higher channel density without redesign - suitable when system requires >4 analog inputs. | Select ADS8638SRGET only if additional channels are needed; pinout differs for AIN4–AIN7, requiring PCB revision. |
| AD7949BCPZ | 8-channel, 14-bit, 1MSPS SAR ADC with internal reference; lacks HVDD/HVSS rails and ±12V input capability. | Requires external signal conditioning for ±10V inputs; no integrated temperature sensor or per-channel comparator. | Choose AD7949BCPZ for higher resolution where ±12V input range and autonomous alarm features are not required. |
Compared with ADS8638SRGET and AD7949BCPZ, the ADS8634SRGET uniquely balances 4-channel integration, ±12V input support via HVDD/HVSS, and autonomous monitoring features - making it optimal for space-constrained industrial modules needing robustness over raw resolution.
Availability
ADS8634SRGET is available at Aetrix Electronics and suitable for industrial process controls (PLC), data acquisition systems, high-speed closed-loop systems, and digital power supplies requiring stable component supply across extended temperature and high-voltage operating conditions.
Supply support for ADS8634SRGET 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 industrial-grade ICs.
The ADS8634 belongs to TI's precision SAR ADC product line, designed specifically for demanding industrial measurement applications requiring wide input voltage ranges, high reliability, and integrated diagnostics - targeting PLCs, motor drives, and test equipment.
FAQ
What input voltage ranges does the ADS8634SRGET support?
The ADS8634SRGET supports software-selectable input ranges of ±10V, ±5V, ±2.5V, 0–10V, and 0–5V using its internal 2.5V reference. With an external reference up to 3.0V, it can accommodate input spans up to ±12V when paired with appropriate HVDD/HVSS supplies - confirmed in the SBAS541A datasheet Section 1 and Electrical Characteristics table.
Does the ADS8634SRGET require external components for basic operation?
No, the ADS8634SRGET integrates a 2.5V voltage reference, temperature sensor, and per-channel digital comparators - enabling standalone operation with only decoupling capacitors (10µF + 0.1µF on AVDD, REF, and DVDD). External op-amps or reference buffers are unnecessary for standard ±10V or 0–10V measurements, as stated in the Features and Highly Integrated sections of the SBAS541A datasheet.
How is the AL_PD pin configured on the ADS8634SRGET?
The AL_PD pin on the ADS8634SRGET is configurable via SPI register: default mode is active-low asynchronous power-down input, but it can be reprogrammed as an active-high alarm output. When used as an alarm, it asserts upon any channel exceeding its programmed threshold - a function verified in the Pin Assignments and Functional Description sections of the SBAS541A datasheet.
What is the thermal performance of the ADS8634SRGET in its QFN-24 package?
The ADS8634SRGET in the RGE (4mm × 4mm QFN-24) package has a junction-to-board thermal resistance (θJB) of 3.3°C/W and junction-to-ambient (θJA) of 32.6°C/W, per the Thermal Information table in SBAS541A. This allows reliable operation at full 1MSPS throughput up to +125°C ambient when mounted on a 2-layer PCB with adequate copper pour under the thermal pad.
Can the ADS8634SRGET interface directly with a 1.8V microcontroller?
Yes, the ADS8634SRGET supports DVDD down to 1.65V and specifies timing parameters (e.g., tsu(DIN-SCLK) = 5.0 ns min at DVDD = 5V, 7.0 ns at 1.8V) fully compatible with 1.8V logic families. Its CMOS digital interface requires no level shifters - confirmed in the Digital Input/Output section and Table 1 of the SBAS541A datasheet.
ADS8634SRGET Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 1M
- Number of Inputs:
- 4
- Input Type:
- Single Ended
- Data Interface:
- SPI
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 2.7V ~ 5.25V
- Voltage - Supply, Digital:
- 1.65V ~ 5.25V
- Features:
- Temperature Sensor
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 24-VQFN (4x4)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS8634SRGET FAQ
1.How can I place an order for ADS8634SRGET through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS8634SRGET 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 ADS8634SRGET reliable?
The price and inventory of ADS8634SRGET are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS8634SRGET is usually 5 days.
3.What payment methods are accepted for ADS8634SRGET?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS8634SRGET transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS8634SRGET?
ADS8634SRGET orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS8634SRGET 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 ADS8634SRGET?
For technical support, including ADS8634SRGET datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS8634SRGET requirements.
6.How does Aetrix verify that ADS8634SRGET is sourced from the original manufacturer or authorized distributors?
All ADS8634SRGET 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 ADS8634SRGET meets industry standards.
7.What is the process for return or replacement of ADS8634SRGET?
All ADS8634SRGET units undergo pre-shipment inspection (PSI). If there is an issue with ADS8634SRGET, 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 ADS8634SRGET part is unused and in its original packaging.
Return procedure for ADS8634SRGET:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADS8634SRGET 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…
