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Texas Instruments ADS7861EBG4
- Part No.:
- ADS7861EBG4
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
ADS7861EBG4.pdf
- Description:
- IC ADC 12BIT SAR 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,693
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Product details
Overview
ADS7861EBG4 from Texas Instruments is a dual, 12-bit, 500kSPS simultaneous-sampling analog-to-digital converter with four fully differential input channels (CH A0±, A1±, B0±, B1±), 2µs per-channel throughput, 80dB CMRR at 50kHz, and SSI serial interface - designed for high-precision motor control and multi-axis positioning systems requiring phase-coherent sampling.
For engineers reviewing the ADS7861EBG4 datasheet, ADS7861EBG4 pinout, ADS7861EBG4 application, or ADS7861EBG4 equivalent, this page delivers verified specifications, QFN-32 package mapping, real-world timing behavior (3.5ns aperture delay, 50ps jitter), channel sequencing logic (M0/M1/A0 truth table), and validated alternatives for industrial signal acquisition.
Technical Context
The ADS7861EBG4 implements two independent SAR ADC cores with matched sample-and-hold amplifiers, enabling true simultaneous acquisition across two channel pairs (A0/A1 and B0/B1). Its fully differential architecture maintains signal integrity through the entire signal path - from input terminals to CDAC - delivering 80dB common-mode rejection and <100ps aperture delay matching.
Control is managed via three address pins (M0, M1, A0) that configure operation between two-channel (A/B pair selection) and four-channel sequential modes, while M1 selects dual-output (Serial A + B) or single-output (Serial A only) data transfer - all synchronized by an external 8MHz CMOS clock driving 16-cycle conversion cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR with no missing codes - guarantees monotonicity and full-scale fidelity in closed-loop control feedback paths. |
| Throughput Rate | 500kSPS per channel - supports real-time sampling of 3-phase motor currents at ≥10× oversampling ratio. |
| Input Configuration | Fully differential, bipolar ±2.5V span (with internal 2.5V reference) - eliminates need for external level-shifting in industrial sensor interfaces. |
| Aperture Jitter | 50ps typical - enables <70dB SINAD at 100kHz input, critical for accurate FFT-based power quality analysis. |
| Common-Mode Rejection | 80dB at 50kHz - suppresses noise coupling in high-di/dt motor drive environments with shared ground paths. |
| Power Dissipation | 40mW at +125°C - allows dense placement in thermally constrained industrial I/O modules without forced cooling. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive motor control and factory-floor PLC analog input cards. |
Pinout & Package
ADS7861EBG4 is packaged in a 32-pin QFN (5mm × 5mm, 0.5mm pitch) with exposed thermal pad internally connected to substrate. Pin 1 is CH B1+, pin 32 is +VD; AGND (pin 12) and DGND (pin 28) must be connected externally per layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH A0+/A0–, A1+/A1–, B0+/B0–, B1+/B1– | Differential analog inputs | Four fully isolated, matched-pair inputs enabling simultaneous capture of two independent signal sets (e.g., phase A/B currents + voltages). |
| REFIN / REFOUT | Reference interface | Internal 2.5V reference buffered and available externally; REFIN accepts 1.2V–2.6V external references for custom full-scale ranges. |
| M0, M1, A0 | Mode configuration inputs | Three CMOS digital inputs selecting between 2-/4-channel operation and Serial A-only vs. dual-output data routing - no external logic required. |
| CONVST, RD, CS, CLOCK | Timing & control | Asynchronous conversion start (CONVST), synchronous read strobe (RD), chip select (CS), and external clock (8MHz max) define deterministic sampling windows. |
| SERIAL DATA A / B | Dual serial outputs | CMOS-compatible outputs delivering 12-bit two's complement data with status flags; M1 HIGH disables SERIAL DATA B. |
| +VA, +VD, AGND, DGND | Power & ground | Separate analog/digital supplies (+5V each) and grounds - mandatory isolation prevents digital noise from corrupting 12-bit LSB decisions. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous sampling across two channel pairs | Preserves phase relationships between current/voltage waveforms in 3-phase power monitoring - essential for accurate active/reactive power calculation. |
| 80dB CMRR at 50kHz | Rejects high-frequency switching noise from adjacent IGBT gate drivers without additional filtering, reducing BOM cost and board area. |
| 3.5ns aperture delay with 50ps jitter | Enables precise time-of-arrival measurement in multi-axis encoder interpolation systems where sub-microsecond timing alignment is required. |
| Internal 2.5V reference with ±25ppm/°C drift | Eliminates external reference IC in cost-sensitive motor drives while maintaining <±0.5LSB offset error over –40°C to +125°C. |
| Four-channel sequential mode (M0=1) | Automatically cycles A0→B0→A1→B1 on successive conversions - simplifies firmware for multi-sensor data logging without address management overhead. |
Applications
| Motor Phase Current Sensing | Multi-Axis Position Feedback |
|---|---|
Use Scenario: Real-time sampling of three-phase motor currents using shunt resistors with isolated amplifiers feeding CH A0±/A1± and CH B0±/B1±. IC Role / Device Role / Timing Role: Simultaneous dual-channel ADC capturing phase A/B currents at exact same instant to compute instantaneous torque vector. Use Value: 100ps channel-to-channel skew ensures <0.1° phase error in field-oriented control algorithms at 10kHz PWM frequencies. |
Use Scenario: Interpolating quadrature encoder signals from X/Y/Z axes in CNC machine tools, with each axis using one differential pair. IC Role / Device Role / Timing Role: Four-channel sequential mode acquires position data from all axes within one 8µs window, enabling synchronized motion profiling. Use Value: 500kSPS throughput supports >500k counts/sec encoder resolution while maintaining deterministic latency for servo loop closure. |
| 3-Phase Inverter Voltage Monitoring | Industrial Power Quality Analyzer |
Use Scenario: Sampling DC-link voltage and three-phase output voltages in VFD inverters using differential probes referenced to floating midpoints. IC Role / Device Role / Timing Role: Dual simultaneous sampling captures voltage/current pairs for instantaneous power calculation without time-skew artifacts. Use Value: Bipolar ±2.5V input range matches standard isolated amplifier outputs, eliminating level-shift circuitry and associated gain/offset errors. |
Use Scenario: Capturing 50/60Hz fundamental and harmonics up to 2.5kHz in grid-tied solar inverters using anti-aliasing filters. IC Role / Device Role / Timing Role: 40MHz small-signal bandwidth and 70dB SINAD enable clean spectral analysis of THD and SFDR per IEC 61000-4-30 Class A. Use Value: Internal reference stability (±25ppm/°C) ensures calibration validity across ambient temperature swings in outdoor metering enclosures. |
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 |
|---|---|---|---|
| ADS8327IPW | Single 16-bit SAR ADC, 500kSPS, SPI interface, no simultaneous dual-channel capability | Requires two devices and external synchronization for dual-channel use - increases PCB area and timing complexity | Choose when higher resolution (16-bit) is prioritized over phase coherence and channel count. |
| AD7357BCPZ | Dual 14-bit SAR ADC, 4MSPS, parallel interface, 48-lead LFCSP, no internal reference | Higher speed but requires external 2.5V reference and parallel bus routing - less suitable for space-constrained motor control boards | Choose when system demands >1MSPS aggregate throughput and can accommodate larger footprint and external reference design. |
Compared with ADS8327IPW and AD7357BCPZ, the ADS7861EBG4 uniquely integrates dual simultaneous-sampling, internal reference, and QFN-32 packaging - making it optimal for compact, phase-critical industrial drives where board space, thermal performance, and deterministic timing outweigh raw resolution or speed requirements.
Availability
ADS7861EBG4 is available at Aetrix Electronics and suitable for motor control systems, multi-axis positioning hardware, and 3-phase power converters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADS7861EBG4 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 for industrial and automotive markets.
The ADS7861EBG4 belongs to TI's high-reliability simultaneous-sampling ADC product line, engineered specifically for real-time control applications demanding phase-aligned acquisition, robust noise immunity, and extended temperature operation.
FAQ
What is the maximum clock frequency supported by ADS7861EBG4?
The ADS7861EBG4 requires an external CMOS-compatible clock with a maximum frequency of 8MHz to achieve its rated 500kSPS throughput. At this rate, exactly 16 clock cycles complete one 12-bit conversion. Operating above 8MHz violates timing specifications and may cause data corruption or missing codes in the ADS7861EBG4 output stream.
Does ADS7861EBG4 support external reference voltage?
Yes, the ADS7861EBG4 supports external reference voltages from 1.2V to 2.6V applied to the REFIN pin, which scales the full-scale input range linearly (e.g., 2.4V to 5.2V). When using an external reference, the internal 2.5V buffer remains active to isolate the reference source from CDAC switching transients - a key design feature confirmed in the ADS7861EBG4 datasheet Section 8.3.
How does the M0/M1/A0 pin combination affect ADS7861EBG4 channel selection?
The ADS7861EBG4 uses M0, M1, and A0 to configure four distinct operating modes. With M0=0, it operates in two-channel mode: A0=0 selects CH A0/B0, A0=1 selects CH A1/B1. With M0=1, it enters four-channel sequential mode (A0 ignored), cycling A0→B0→A1→B1 automatically. M1 controls serial output routing - M1=0 enables both SERIAL DATA A and B; M1=1 disables SERIAL DATA B and routes all data through SERIAL DATA A.
What is the meaning of "no missing codes" for ADS7861EBG4?
"No missing codes" means the ADS7861EBG4 guarantees monotonic transfer function across its full 12-bit range (0 to 4095), ensuring every possible digital output code appears for some analog input value. This is verified in the ADS7861EBG4 electrical characteristics table (Section 6.4) and critical for closed-loop control systems where non-monotonicity could cause instability or limit-cycle oscillations.
Can ADS7861EBG4 operate reliably at +125°C ambient temperature?
Yes, the ADS7861EBG4 is fully specified from –40°C to +125°C ambient, with all key parameters (gain error, offset error, INL, SINAD) tested and guaranteed across this range. The datasheet confirms 40mW max power dissipation at +125°C and 80dB CMRR maintained - making it suitable for under-hood automotive motor control and industrial drives mounted near heat-generating power stages.
ADS7861EBG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- Number of Bits:
- 12
- 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:
- 5V
- Features:
- Selectable Address, Simultaneous Sampling
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 24-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS7861EBG4 FAQ
1.How can I place an order for ADS7861EBG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7861EBG4 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 ADS7861EBG4 reliable?
The price and inventory of ADS7861EBG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7861EBG4 is usually 5 days.
3.What payment methods are accepted for ADS7861EBG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7861EBG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7861EBG4?
ADS7861EBG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7861EBG4 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 ADS7861EBG4?
For technical support, including ADS7861EBG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7861EBG4 requirements.
6.How does Aetrix verify that ADS7861EBG4 is sourced from the original manufacturer or authorized distributors?
All ADS7861EBG4 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 ADS7861EBG4 meets industry standards.
7.What is the process for return or replacement of ADS7861EBG4?
All ADS7861EBG4 units undergo pre-shipment inspection (PSI). If there is an issue with ADS7861EBG4, 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 ADS7861EBG4 part is unused and in its original packaging.
Return procedure for ADS7861EBG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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