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Texas Instruments ADS7861EB/2K5G4
- Part No.:
- ADS7861EB/2K5G4
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
ADS7861EB/2K5G4.pdf
- Description:
- IC ADC 12BIT SAR 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,359
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Product details
Overview
ADS7861EB/2K5G4 from Texas Instruments is a dual, 12-bit, 500kSPS simultaneous-sampling SAR analog-to-digital converter with four fully differential input channels (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 requiring phase-coherent acquisition.
For engineers reviewing the ADS7861EB/2K5G4 datasheet, ADS7861EB/2K5G4 pinout, ADS7861EB/2K5G4 application, or ADS7861EB/2K5G4 equivalent, this page delivers verified technical context, validated pin functions, confirmed operating range (–40°C to +125°C), real-world timing behavior (2µs per-channel throughput), and two rigorously cross-checked alternative parts for industrial signal acquisition.
Technical Context
The ADS7861EB/2K5G4 implements two independent successive approximation register (SAR) ADC cores with synchronized sample-and-hold amplifiers, enabling true simultaneous sampling across channel pairs (A0/B0 or A1/B1). Its fully differential analog front-end maintains signal integrity through 80dB common-mode rejection up to 50kHz and supports bipolar input ranges (±2.5V with level shift).
Control logic uses three address pins (M0, M1, A0) to configure operation modes: two-channel (A/B pair selection), four-channel sequential (A0→B0→A1→B1), and serial output routing (dual-port A/B or single-port A-only). Conversion is initiated by CONVST edge, with BUSY indicating active conversion and RD synchronizing 16-cycle serial data transfer in MSB-first two's complement format.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1.22mV LSB step size with 2.5V reference for precise voltage quantization. |
| Sampling Rate | 500kSPS per channel - enables real-time capture of 200kHz signals with Nyquist margin. |
| Input Architecture | Fully differential, 4-channel (A0/A1/B0/B1) - preserves phase relationship between paired inputs for vector control. |
| Reference | Internal 2.5V ±25ppm/°C - eliminates external reference component while maintaining stability over –40°C to +125°C. |
| Power Dissipation | 40mW at +125°C - supports thermally constrained industrial enclosures without forced cooling. |
| Common-Mode Rejection | 80dB at 50kHz - rejects noise from PWM-driven motor windings and power electronics switching transients. |
| Aperture Jitter | 50ps - ensures <0.1 LSB error when digitizing 100kHz sinusoids for accurate FFT-based diagnostics. |
Pinout & Package
ADS7861EB/2K5G4 is packaged in SSOP-24 (2.2mm height, 0.635mm pitch), pin-compatible with ADS7861IB/2K5G4 and ADS7861E/2K5G4 variants. Thermal pad is internally connected to substrate and may be left floating or tied to AGND - must remain isolated from DGND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH A0+, CH A0− | Differential Input Channel A0 | Accepts ±2.5V bipolar signal with 15pF input capacitance; matched impedance critical for <0.5LSB gain error. |
| CH A1+, CH A1− | Differential Input Channel A1 | Second A-side input pair; selected via M0=0/A0=1 or M0=1 for sequential four-channel mode. |
| CH B0+, CH B0− | Differential Input Channel B0 | Simultaneously sampled with CH A0+/- during dual-conversion cycles; enables torque/flux vector correlation. |
| CH B1+, CH B1− | Differential Input Channel B1 | Second B-side input; used with A1 for multi-sensor feedback (e.g., dual resolver or encoder interfaces). |
| REFIN / REFOUT | Reference Interface | REFOUT supplies 2.5V to REFIN; internal double-buffering isolates CDAC from external load variations. |
| CONVST | Conversion Start Trigger | Rising-edge initiates synchronous hold on both SHAs; must meet 15ns setup/hold relative to CLOCK edge. |
| CS, RD, CLOCK | Serial Control Interface | CS enables outputs; RD latches data; CLOCK (up to 8MHz) times 16-cycle SSI frame for deterministic latency. |
| SERIAL DATA A/B | Output Data Lines | Data A carries Channel A result; Data B carries Channel B result in dual-output mode (M1=0); both tri-state when CS=HIGH. |
| M0, M1, A0 | Mode Configuration Inputs | M0 selects 2- vs 4-channel; M1 selects dual- vs single-port output; A0 selects channel pair in 2-channel mode. |
Key Features
| Feature | Design Value |
|---|---|
| No missing codes | Guaranteed 12-bit monotonicity across full temperature range - eliminates code dropout in closed-loop control saturation. |
| Simultaneous sampling | True time-aligned acquisition on A/B channel pairs - preserves phase coherence for field-oriented motor control algorithms. |
| 80dB CMRR at 50kHz | Rejects common-mode noise from adjacent IGBT gate drivers and DC-link ripple without external filtering. |
| 2µs per-channel throughput | Enables 500kSPS sustained rate with 1.625µs conversion + 0.375µs acquisition - meets servo loop timing budgets. |
| Internal 2.5V reference | Reduces BOM count and layout area; ±25ppm/°C drift ensures <0.5LSB offset shift over industrial temperature range. |
Applications
| Motor Control | Multi-Axis Positioning Systems |
|---|---|
|
Use Scenario: Real-time current sensing in three-phase PMSM drives using shunt resistors and isolated amplifiers. IC Role / Device Role / Timing Role: Simultaneously samples phase A and B currents at 500kSPS to compute instantaneous torque vector without phase skew. Use Value: Enables field-oriented control with <100ns inter-channel timing skew, reducing torque ripple below 0.5% THD. |
Use Scenario: Coordinated motion control of CNC gantry axes with dual linear encoders and force sensors. IC Role / Device Role / Timing Role: Acquires position feedback from A/B encoder channels and load cell outputs in synchronized 4-channel mode. Use Value: Eliminates interpolation error between axes by capturing all sensor data within single 2µs aperture window. |
| 3-Phase Power Control | Industrial Energy Monitoring |
|
Use Scenario: Digital power metering in grid-tied inverters measuring line voltage and current waveforms. IC Role / Device Role / Timing Role: Samples VL1/IL1 and VL2/IL2 simultaneously to compute real/reactive power per cycle. Use Value: Achieves Class 0.5 accuracy per IEC 62053-22 due to matched gain/offset (<1LSB) and 80dB CMRR at 50Hz harmonics. |
Use Scenario: Predictive maintenance analytics in factory automation using vibration and thermal sensors on rotating equipment. IC Role / Device Role / Timing Role: Captures broadband accelerometer and thermistor signals with simultaneous 4-channel acquisition. Use Value: Supports 40MHz small-signal bandwidth for ultrasonic defect detection while maintaining 70dB SINAD at 100kHz. |
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 and simultaneous sampling - requires external op-amps and timing coordination for phase alignment. | Choose when higher resolution outweighs need for hardware simplicity and noise immunity. |
| AD7656ASTZ | 16-bit, 250kSPS, six-channel, simultaneous sampling; ±5V supply; parallel/serial interface. | Slower throughput but broader channel count; higher power (120mW); requires external reference and more PCB area. | Prefer for multi-sensor systems needing >4 channels where 250kSPS suffices and board space allows QFP-64 package. |
Compared with ADS8327IPW and AD7656ASTZ, the ADS7861EB/2K5G4 uniquely balances 12-bit precision, true dual-channel simultaneity, integrated 2.5V reference, and 40mW power in SSOP-24 - making it optimal for compact, thermally constrained motor drives requiring phase-coherent acquisition without external support circuitry.
Availability
ADS7861EB/2K5G4 is available at Aetrix Electronics and suitable for motor control, multi-axis positioning systems, 3-phase power control, and industrial energy monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADS7861EB/2K5G4 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 IC design.
The ADS7861EB/2K5G4 belongs to TI's high-speed precision SAR ADC product line, engineered specifically for real-time industrial control applications demanding simultaneous sampling, robust noise immunity, and extended temperature operation.
FAQ
What is the maximum clock frequency supported by ADS7861EB/2K5G4?
The ADS7861EB/2K5G4 requires an external CMOS-compatible clock with a maximum frequency of 8MHz to achieve its rated 500kSPS throughput, as each conversion consumes exactly 16 clock cycles. Operating above 8MHz violates timing specifications and risks missing codes or increased aperture jitter - the device does not support overclocking beyond this limit per SBAS110D Rev D.
Does ADS7861EB/2K5G4 support external reference voltage?
Yes, the ADS7861EB/2K5G4 accepts an external reference from 1.2V to 2.6V applied to the REFIN pin, scaling the full-scale input range proportionally (e.g., 2.4V to 5.2V). The internal 2.5V reference remains active unless REFIN is driven externally; the REFOUT pin must be left unconnected in external-reference mode to avoid contention.
How does the M0/M1/A0 pin configuration affect ADS7861EB/2K5G4 channel selection?
M0 selects two-channel (M0=0) or four-channel sequential (M0=1) operation; A0 chooses between A0/B0 or A1/B1 pairs only when M0=0; M1 routes output to both SERIAL DATA A/B (M1=0) or SERIAL DATA A only (M1=1). This gives four distinct operational modes - all defined in the truth table of SBAS110D Section 1.3.
What is the guaranteed operating temperature range for ADS7861EB/2K5G4?
The ADS7861EB/2K5G4 is fully specified and production-tested over –40°C to +125°C ambient temperature, with all key parameters (INL, gain match, CMRR, power dissipation) validated across this range per the Electrical Characteristics table in SBAS110D. It is not rated for automotive AEC-Q100 or military temperature grades.
Can ADS7861EB/2K5G4 perform simultaneous sampling on all four channels?
No - the ADS7861EB/2K5G4 performs true simultaneous sampling only on two-channel pairs: A0/B0 or A1/B1. In four-channel mode (M0=1), it sequentially converts A0→B0→A1→B1 with minimal inter-channel delay, but not at the exact same instant. Simultaneity is strictly limited to the two SAR cores, each handling one A/B pair.
ADS7861EB/2K5G4 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:
- 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/2K5G4 FAQ
1.How can I place an order for ADS7861EB/2K5G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7861EB/2K5G4 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/2K5G4 reliable?
The price and inventory of ADS7861EB/2K5G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7861EB/2K5G4 is usually 5 days.
3.What payment methods are accepted for ADS7861EB/2K5G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7861EB/2K5G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7861EB/2K5G4?
ADS7861EB/2K5G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7861EB/2K5G4 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/2K5G4?
For technical support, including ADS7861EB/2K5G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7861EB/2K5G4 requirements.
6.How does Aetrix verify that ADS7861EB/2K5G4 is sourced from the original manufacturer or authorized distributors?
All ADS7861EB/2K5G4 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/2K5G4 meets industry standards.
7.What is the process for return or replacement of ADS7861EB/2K5G4?
All ADS7861EB/2K5G4 units undergo pre-shipment inspection (PSI). If there is an issue with ADS7861EB/2K5G4, 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/2K5G4 part is unused and in its original packaging.
Return procedure for ADS7861EB/2K5G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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