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Texas Instruments ADS8361IDBQRG4
- Part No.:
- ADS8361IDBQRG4
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
ADS8361IDBQRG4.pdf
- Description:
- IC ADC 16BIT SAR 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,242
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Product details
Overview
ADS8361IDBQRG4 from Texas Instruments is a dual, 16-bit, 500kSPS simultaneous-sampling analog-to-digital converter with four fully differential input channels (CH A0±, A1±, B0±, B1±), internal 2.5V reference, and serial interface - designed for high-precision motor control and multi-axis positioning systems requiring phase-coherent acquisition across two independent signal pairs.
For engineers reviewing the ADS8361IDBQRG4 datasheet, ADS8361IDBQRG4 pinout, ADS8361IDBQRG4 application, or ADS8361IDBQRG4 equivalent, key selection criteria include simultaneous 2-channel sampling capability, ±8 LSB integral linearity error over –40°C to +125°C, 80 dB CMRR at 50 kHz, 2 μs per-channel conversion time, and SSOP-24 package compatibility with ADS7861.
Technical Context
The ADS8361IDBQRG4 implements two independent successive approximation register (SAR) ADC cores, each paired with a fully differential sample-and-hold amplifier, enabling true simultaneous sampling of two channel pairs (A0/A1 and B0/B1) without inter-channel skew. Its internal 2.5V reference (±1% initial accuracy, ±20 ppm/°C drift) feeds both SARs and supports external reference override via REFIN.
Control logic uses three address pins (M0, M1, A0) to configure operation modes: two-channel (A0/B0 or A1/B1), four-channel sequential, and serial output routing (dual-port or single-port A-only). BUSY, CONVST, RD, and CS signals coordinate timing with external clock (0.1–10 MHz), achieving 500 kSPS aggregate throughput with 1.6 μs typical conversion time per ADC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit SAR architecture delivering no missing codes up to 14 bits; enables 76 μV LSB step size with 2.5V reference. |
| Sampling Rate | 500 kSPS aggregate (250 kSPS per ADC pair); requires 10 MHz master clock (20 cycles/conversion). |
| INL Error | ±8 LSB max over full temperature range (–40°C to +125°C); ensures <0.012% full-scale linearity deviation in closed-loop control. |
| CMRR | 80 dB at 50 kHz; maintains signal integrity in noisy industrial environments with common-mode interference. |
| Power Dissipation | 150 mW typical at BVDD = 3 V; supports thermally constrained embedded designs without active cooling. |
| Aperture Jitter | 50 ps RMS; preserves SNR >83 dB for 10 kHz input signals, critical for accurate FFT-based diagnostics. |
| Operating Temperature | –40°C to +125°C junction range; qualified for under-hood automotive and industrial motor drive applications. |
Pinout & Package
ADS8361IDBQRG4 is packaged in SSOP-24 (DBQ), with exposed thermal pad connected to AGND. Pin assignments match ADS7861 for drop-in replacement in legacy designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH A0+, CH A0− | Differential Input Channel A0 | Accepts ±2.5V bipolar signal centered at 2.5V; 25 pF input capacitance requires low-impedance drive for 16-bit settling. |
| CH A1+, CH A1− | Differential Input Channel A1 | Second A-pair input; sampled simultaneously with A0 for multi-phase current sensing in 3-phase inverters. |
| CH B0+, CH B0− | Differential Input Channel B0 | Independent B-pair input; used with A0 for position/velocity feedback correlation in servo loops. |
| CH B1+, CH B1− | Differential Input Channel B1 | Second B-pair input; enables four-channel sequential mode when M0 = HIGH. |
| CONVST | Conversion Start Trigger | Asynchronous edge-triggered command; initiates simultaneous hold on all four inputs regardless of clock phase. |
| SERIAL DATA A / B | CMOS Serial Output Ports | MSB-first 16-bit words with status flags; M1 selects dual-output (A+B) or A-only multiplexed mode. |
| REFOUT / REFIN | Internal Reference Buffer I/O | REFOUT supplies 2.5V ±1% to REFIN; supports external reference (1.2–2.6V) for custom full-scale ranges. |
| AVDD, BVDD, AGND, BGND | Analog/Digital Power & Ground | Separate 5V analog (AVDD) and 2.7–5.5V digital (BVDD) rails; AGND/BGND must be tied at single point to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous Sampling | Two independent SAR cores acquire CH A0±/A1± and CH B0±/B1± at identical instants - preserves phase relationships for vector control algorithms. |
| Internal Reference Buffer | 2.5V output with 10 μA drive capability and 12 μVrms noise (10 Hz–10 kHz); eliminates need for external precision reference in cost-sensitive designs. |
| Flexible Serial Interface | Configurable M0/M1/A0 logic enables four operating modes (2-ch/4-ch, dual/single serial port) - reduces firmware complexity vs discrete ADC solutions. |
| High CMRR Architecture | 84 dB DC and 80 dB @ 50 kHz rejection achieved via fully differential front-end and matched CDAC switching - suppresses EMI in motor drive PCBs. |
| Pin Compatibility | SSOP-24 footprint matches ADS7861; allows 16-bit resolution upgrade without PCB redesign or layout changes. |
Applications
| Motor Phase Current Sensing | Multi-Axis Servo Position Feedback |
|---|---|
|
Use Scenario: Real-time measurement of three-phase inverter leg currents using shunt resistors and isolated amplifiers. IC Role / Device Role / Timing Role: Simultaneous sampling of CH A0±/B0± captures instantaneous current vectors for field-oriented control (FOC) without phase skew. Use Value: 2 μs per-channel conversion time and 100 ps aperture matching enable <1° electrical angle error in 10 kHz PWM systems. |
Use Scenario: Coordinated acquisition of encoder sine/cosine outputs and resolver signals across X/Y/Z axes in CNC machines. IC Role / Device Role / Timing Role: Four-channel sequential mode (M0=HIGH) acquires all position sensors within 4 μs total window for synchronized motion planning. Use Value: 80 dB CMRR rejects ground-loop noise from high-current motor drivers, maintaining <0.005° angular resolution. |
| 3-Phase Power Quality Monitoring | Industrial PLC Analog Input Module |
|
Use Scenario: Simultaneous voltage and current sampling on all three phases for harmonic analysis and THD calculation. IC Role / Device Role / Timing Role: Dual-channel mode (A0/B0) captures line-to-line voltages while A1/B1 monitor phase currents - preserving cycle coherence. Use Value: 94 dB SFDR and 83 dB SNR support IEC 61000-4-30 Class A compliance for 50/60 Hz fundamental + 50th harmonic measurements. |
Use Scenario: High-density analog input card in programmable logic controllers handling mixed sensor types (RTD, thermocouple, 4–20 mA). IC Role / Device Role / Timing Role: Internal 2.5V reference and flexible REFIN interface simplify calibration across 16+ channels without external reference ICs. Use Value: ±2.5 mV bipolar offset error over –40°C to +125°C reduces cold-junction compensation drift in thermocouple inputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel, simultaneous-sampling ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8361IRHBR | Same silicon, QFN-32 (5×5 mm) package with thermal pad; 3000-unit tape-and-reel; RθJA = 36.7°C/W vs SSOP's 88°C/W. | Better thermal performance for high-density PCBs; requires different land pattern and reflow profile. | Select IRHBR for space-constrained, thermally demanding applications; IDBQRG4 preferred for legacy SSOP-24 compatibility. |
| ADS7861IDBQR | 12-bit version; same SSOP-24 pinout, 500 kSPS, but ±1 LSB INL and no internal reference - requires external REF. | Limited to lower-precision control loops; lacks simultaneous sampling match spec (4 LSB vs ADS8361's 1 LSB match). | Choose ADS7861IDBQR only when 12-bit resolution suffices and external reference infrastructure already exists. |
Compared with ADS8361IRHBR, ADS8361IDBQRG4 offers proven SSOP-24 manufacturability and direct ADS7861 drop-in replacement; versus ADS7861IDBQR, it delivers 4-bit resolution uplift, integrated reference, and tighter channel matching - justifying upgrade in FOC and power analytics.
Availability
ADS8361IDBQRG4 is available at Aetrix Electronics and suitable for motor control, multi-axis positioning systems, and 3-phase power control requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADS8361IDBQRG4 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 and embedded processing technologies, with decades of expertise in precision data converters and industrial signal chain solutions.
The ADS8361 product line targets high-fidelity, real-time acquisition in electric drives and automation - emphasizing simultaneous sampling, robust noise immunity, and seamless migration from 12-bit predecessors like the ADS7861.
FAQ
What is the maximum sampling rate achievable with ADS8361IDBQRG4?
The ADS8361IDBQRG4 achieves a maximum aggregate sampling rate of 500 kSPS - meaning 250 kSPS per ADC core. This requires a 10 MHz external clock (20 clock cycles per 16-bit conversion). At lower clock frequencies, the rate scales linearly (e.g., 5 MHz clock yields 250 kSPS aggregate). The device maintains specified AC performance (SNR, THD) only within the 0.1–10 MHz clock range.
Does ADS8361IDBQRG4 require an external reference voltage?
No, ADS8361IDBQRG4 includes an internal 2.5V reference with ±1% initial accuracy and ±20 ppm/°C drift, accessible via REFOUT and usable directly at REFIN. However, it also supports external references from 1.2V to 2.6V applied to REFIN - enabling custom full-scale ranges (e.g., ±1.2V for 2.4V span) while retaining 16-bit linearity.
How does ADS8361IDBQRG4 support simultaneous sampling across channels?
ADS8361IDBQRG4 integrates two independent SAR ADCs, each with its own differential sample-and-hold amplifier. When CONVST goes HIGH, both SHAs freeze their inputs simultaneously - capturing CH A0±/A1± and CH B0±/B1± at the exact same instant. This hardware-level synchronization eliminates phase skew critical for vector control and power quality analysis.
What are the power supply requirements for ADS8361IDBQRG4?
ADS8361IDBQRG4 requires two separate supplies: AVDD = 4.75–5.25V (analog, typically 5V) and BVDD = 2.7–3.6V or 4.5–5.5V (digital I/O, supporting LVCMOS or 5V CMOS logic). AGND and BGND must be connected at a single point. Total power dissipation is 150 mW typical at BVDD = 3V, with thermal resistance RθJA = 88°C/W in SSOP-24.
Is ADS8361IDBQRG4 pin-compatible with ADS7861?
Yes, ADS8361IDBQRG4 is explicitly designed as a pin-compatible 16-bit upgrade to the 12-bit ADS7861 in SSOP-24 packaging. All pin functions, physical layout, and control timing (CONVST, RD, CS, CLOCK) match - allowing direct replacement without PCB modification. Firmware updates are needed only to handle 16-bit data words instead of 12-bit.
ADS8361IDBQRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 500k
- Number of Inputs:
- 4
- Input Type:
- Differential
- Data Interface:
- SPI
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 2
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 2.7V ~ 3.6V, 5V
- Features:
- Simultaneous Sampling
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 24-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS8361IDBQRG4 FAQ
1.How can I place an order for ADS8361IDBQRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS8361IDBQRG4 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 ADS8361IDBQRG4 reliable?
The price and inventory of ADS8361IDBQRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS8361IDBQRG4 is usually 5 days.
3.What payment methods are accepted for ADS8361IDBQRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS8361IDBQRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS8361IDBQRG4?
ADS8361IDBQRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS8361IDBQRG4 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 ADS8361IDBQRG4?
For technical support, including ADS8361IDBQRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS8361IDBQRG4 requirements.
6.How does Aetrix verify that ADS8361IDBQRG4 is sourced from the original manufacturer or authorized distributors?
All ADS8361IDBQRG4 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 ADS8361IDBQRG4 meets industry standards.
7.What is the process for return or replacement of ADS8361IDBQRG4?
All ADS8361IDBQRG4 units undergo pre-shipment inspection (PSI). If there is an issue with ADS8361IDBQRG4, 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 ADS8361IDBQRG4 part is unused and in its original packaging.
Return procedure for ADS8361IDBQRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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