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Texas Instruments ADS7861EB/2K5
- Part No.:
- ADS7861EB/2K5
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
ADS7861EB/2K5.pdf
- Description:
- IC ADC 12BIT SAR 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,332
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Product details
Overview
ADS7861EB/2K5 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±), 2.5V internal reference, 80dB CMRR at 50kHz, and SSI serial interface - designed for high-precision motor control and multi-axis positioning systems.
For engineers reviewing the ADS7861EB/2K5 datasheet, ADS7861EB/2K5 pinout, ADS7861EB/2K5 application, or ADS7861EB/2K5 equivalent, key selection criteria include simultaneous dual-channel acquisition timing (≤2µs per channel), bipolar ±2.5V input range referenced to internal 2.5V, 12-bit no-missing-codes performance, and operation across –40°C to +125°C industrial temperature range.
Technical Context
The ADS7861EB/2K5 implements two independent SAR ADC cores with matched sample-and-hold amplifiers enabling true simultaneous sampling across Channel A (A0/A1) and Channel B (B0/B1). Its fully differential architecture maintains signal integrity through the entire signal path - from input terminals to CDAC - delivering 80dB common-mode rejection at 50kHz and <100ps aperture delay matching.
Control logic uses three address pins (M0, M1, A0) to configure four operating modes: two-channel fixed-pair (A0/B0 or A1/B1), two-channel single-side (A-only), or four-channel sequential acquisition. Data output is delivered via dual SSI ports (Serial Data A/B) in binary two's complement format, with BUSY signaling conversion status and RD synchronizing read cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - guarantees monotonic transfer function with no missing codes over full temperature range. |
| Sampling Rate | 500 kSPS per channel - supports real-time closed-loop control in servo drives and 3-phase inverters. |
| Input Configuration | Four fully differential inputs (CH A0±, A1±, B0±, B1±) - enables phase-coherent acquisition of current/voltage pairs. |
| Reference | Internal 2.5V ±25 ppm/°C drift - eliminates external reference component while maintaining <0.5 LSB gain error match. |
| Common-Mode Rejection | 80 dB at 50 kHz - suppresses noise coupling in high-di/dt motor drive environments. |
| Power Dissipation | 40 mW at +125°C - enables compact thermal design in space-constrained industrial modules. |
| Aperture Jitter | 50 ps RMS - ensures <70 dB SINAD for 100 kHz input signals without external clock conditioning. |
Pinout & Package
ADS7861EB/2K5 is packaged in SSOP-24 (shrink small-outline package), pin-compatible with ADS7861IB/2K5 and ADS7861E variants. The package features exposed thermal pad internally connected to substrate; TI recommends connecting it to AGND for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH A0+, CH A0− | Differential Input Pair A0 | Accepts fully differential analog signal; common-mode voltage range ±1.25V around 2.5V reference. |
| CH A1+, CH A1− | Differential Input Pair A1 | Second A-side channel; selected via M0/A0 control for time-aligned sampling with A0. |
| CH B0+, CH B0− | Differential Input Pair B0 | Independent B-side channel; simultaneously sampled with A0 or A1 depending on mode. |
| CH B1+, CH B1− | Differential Input Pair B1 | Second B-side channel; enables four-channel sequential acquisition when M0 = HIGH. |
| REFIN / REFOUT | Reference Interface | REFOUT supplies internal 2.5V reference; REFIN accepts external 1.2–2.6V reference for custom full-scale ranges. |
| CONVST | Conversion Start Trigger | Edge-sensitive input initiating simultaneous hold on both SHA stages; minimum 15 ns pulse width required. |
| RD | Read Synchronization | Controls data validity timing; falling edge initiates 16-cycle serial output window on Serial Data A/B. |
| CS | Chip Select | Active-low enable for serial outputs; tri-states outputs when HIGH to prevent bus contention. |
| BUSY | Conversion Status Flag | Active-HIGH during conversion; returns LOW after third LSB transmission - used for interrupt-driven read timing. |
| M0, M1, A0 | Mode Configuration Inputs | Set operating mode: two- vs. four-channel, A-only vs. A+B, and serial output routing (dual vs. single port). |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous Sampling Architecture | Two independent SHA+ADC paths preserve phase relationship between A/B channel pairs - critical for vector control algorithms. |
| 80 dB CMRR at 50 kHz | Rejects PWM-induced common-mode noise in motor phase current sensing without external filtering. |
| 12-bit No-Missing-Codes Performance | Guaranteed linearity over –40°C to +125°C - eliminates calibration steps for industrial temperature cycling. |
| Internal 2.5V Reference with Buffer | Double-buffered output sources up to 2 mA - drives external circuitry without degrading ADC accuracy. |
| Configurable Serial Interface | M0/M1/A0 pins select among four acquisition modes and dual/single serial output routing - reduces firmware overhead in real-time systems. |
Applications
| Motor Control | Multi-Axis Positioning Systems |
|---|---|
Use Scenario: Real-time current and voltage feedback acquisition in 3-phase BLDC/PMSM servo drives. IC Role / Device Role / Timing Role: Simultaneously samples phase currents (A0/A1) and DC-link voltage (B0/B1) with sub-2µs inter-channel skew to enable field-oriented control. Use Value: Maintains torque ripple <1% by preserving phase coherence between current and voltage measurements at 500kSPS. |
Use Scenario: Coordinated motion control in CNC machines with X/Y/Z axis encoders and force sensors. IC Role / Device Role / Timing Role: Acquires position error signals from multiple resolvers or LVDTs using matched A/B channel pairs for jitter-free interpolation. Use Value: Enables <1 µm positioning resolution by eliminating timing skew between axes during high-speed trajectory updates. |
| 3-Phase Power Control | Industrial Energy Monitoring |
Use Scenario: Real-time power quality analysis in grid-tied inverters and active filters. IC Role / Device Role / Timing Role: Captures line voltage and current waveforms across all three phases with synchronized sampling to compute true RMS, THD, and reactive power. Use Value: Achieves Class A accuracy per IEC 61000-4-30 due to <100 ps aperture matching between channels. |
Use Scenario: Transformer health monitoring via partial discharge detection in substations. IC Role / Device Role / Timing Role: Digitizes high-frequency transient pulses (up to 40 MHz bandwidth) from coupling capacitors with 12-bit fidelity and low noise floor (120 µVrms). Use Value: Detects sub-nanocoulomb discharges by resolving <1.22 mV LSB steps across ±2.5V input range. |
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 | 16-bit, 500kSPS, single-ended inputs only; no internal reference; SPI interface. | Lacks differential input structure and simultaneous A/B sampling - requires external op-amps and timing coordination. | Select when higher resolution is prioritized over phase coherence and system-level noise immunity. |
| AD7656ASTZ | 16-bit, 250kSPS, six-channel simultaneous sampling; ±5V supply; parallel/serial interface. | Slower throughput and larger footprint; supports more channels but consumes >100 mW at full speed. | Select when multi-channel scalability (≥6) and 16-bit precision outweigh power and board space constraints. |
Compared with ADS8327IPW and AD7656ASTZ, the ADS7861EB/2K5 uniquely balances 12-bit precision, true dual-channel simultaneity, differential noise immunity, and ultra-low 40 mW power - making it optimal for compact, thermally constrained motor control modules requiring deterministic timing.
Availability
ADS7861EB/2K5 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 and long production lifecycles.
Supply support for ADS7861EB/2K5 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-grade signal chain solutions.
The ADS7861 product line was engineered specifically for high-reliability industrial motion control and power electronics, emphasizing simultaneous sampling accuracy, wide temperature operation, and robust noise immunity in electrically hostile environments.
FAQ
What is the maximum sampling rate supported by the ADS7861EB/2K5?
The ADS7861EB/2K5 achieves a maximum throughput rate of 500 kSPS per channel when operated with an 8 MHz external clock. Each 12-bit conversion requires exactly 16 clock cycles, resulting in a total conversion time of 2 µs per channel. This rate is maintained across the full –40°C to +125°C temperature range and is guaranteed with no missing codes.
Does the ADS7861EB/2K5 require an external reference voltage?
No, the ADS7861EB/2K5 includes a precision internal 2.5V reference with ±25 ppm/°C drift and 50 µVPP noise, fully specified over temperature. The REFIN and REFOUT pins are internally connected by default; users may apply an external 1.2V–2.6V reference to REFIN if custom full-scale ranges (e.g., ±5V) are needed - but the internal reference is sufficient for standard ±2.5V bipolar operation.
How does the ADS7861EB/2K5 achieve simultaneous sampling across two channels?
The ADS7861EB/2K5 integrates two independent sample-and-hold amplifiers and SAR ADC cores. When CONVST is asserted, both SHAs switch from sample to hold mode simultaneously - freezing analog inputs at identical instants. This hardware-level synchronization ensures <100 ps aperture delay matching between Channel A and Channel B, preserving phase relationships critical for vector control.
What package type is used for the ADS7861EB/2K5?
The ADS7861EB/2K5 is supplied in a 24-pin SSOP (Shrink Small-Outline Package) with 0.65 mm lead pitch. It shares pinout compatibility with the ADS7861IB/2K5 and ADS7861E variants. The package includes an exposed thermal pad internally connected to the substrate, which TI recommends connecting to AGND for optimal thermal performance in high-power-density designs.
Can the ADS7861EB/2K5 interface directly with a microcontroller SPI peripheral?
The ADS7861EB/2K5 uses a proprietary SSI (Synchronous Serial Interface) protocol, not standard SPI. While it shares clock/data/control signal concepts, its timing requires precise RD synchronization and 16-cycle data framing with status bits. Direct SPI peripheral connection is not supported; interfacing requires GPIO-controlled timing or a dedicated serial controller configured for ADS7861EB/2K5's specific protocol.
ADS7861EB/2K5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- -
ADS7861EB/2K5 FAQ
1.How can I place an order for ADS7861EB/2K5 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7861EB/2K5 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 ADS7861EB/2K5 reliable?
The price and inventory of ADS7861EB/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7861EB/2K5 is usually 5 days.
3.What payment methods are accepted for ADS7861EB/2K5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7861EB/2K5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7861EB/2K5?
ADS7861EB/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7861EB/2K5 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 ADS7861EB/2K5?
For technical support, including ADS7861EB/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7861EB/2K5 requirements.
6.How does Aetrix verify that ADS7861EB/2K5 is sourced from the original manufacturer or authorized distributors?
All ADS7861EB/2K5 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 ADS7861EB/2K5 meets industry standards.
7.What is the process for return or replacement of ADS7861EB/2K5?
All ADS7861EB/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with ADS7861EB/2K5, 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 ADS7861EB/2K5 part is unused and in its original packaging.
Return procedure for ADS7861EB/2K5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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