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Texas Instruments ADS7861E
- Part No.:
- ADS7861E
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
ADS7861E.pdf
- Description:
- IC ADC 12BIT SAR 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,209
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Product details
Overview
ADS7861E from Texas Instruments is a dual, 12-bit, 500kSPS simultaneous-sampling analog-to-digital converter with four fully differential input channels (A0/A1/B0/B1), internal 2.5V reference, and SSI serial interface - designed for high-noise motor control and multi-axis positioning systems requiring precise phase-aligned acquisition.
For engineers reviewing the ADS7861E datasheet, ADS7861E pinout, ADS7861E application, or ADS7861E equivalent, this page delivers verified specifications, SSOP-24 and QFN-32 package mapping, channel-select logic (M0/M1/A0), bipolar ±2.5V input support, and real-world timing constraints including 3.5ns aperture delay and 16-cycle conversion clocking.
Technical Context
The ADS7861E implements two independent SAR ADCs with matched sample-and-hold amplifiers, enabling true simultaneous sampling across two channel pairs (A0/B0 and A1/B1) while maintaining 80dB common-mode rejection at 50kHz. Its dual serial interface supports either parallel output on DATA A/DATA B or multiplexed output on DATA A only via M1 control.
Channel selection is determined by M0 (two- vs. four-channel mode), A0 (channel pair index), and M1 (serial output configuration), with all conversions initiated synchronously by CONVST rising edge - decoupled from external clock edges to ensure deterministic hold timing and sub-100ps aperture jitter matching.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR architecture with no missing codes over full temperature range. |
| Throughput Rate | 500kSPS per channel; requires 8MHz master clock (16 cycles/conversion). |
| Analog Input | Fully differential ±2.5V span (bipolar), 15pF input capacitance, ±1µA leakage. |
| Reference | Internal 2.5V ±25ppm/°C drift; supports external 1.2V–2.6V reference via REFIN/REFOUT. |
| Timing | 3.5ns aperture delay, 50ps aperture jitter, 2µs total throughput per channel. |
| Power | 40mW typical at +125°C; +VA/+VD = 4.75–5.25V, CMOS-compatible digital I/O. |
| Temperature Range | Specified from –40°C to +125°C; integral linearity ±0.75 LSB max over full range. |
Pinout & Package
ADS7861E is available in SSOP-24 and QFN-32 packages. Pin functions are identical across both variants; SSOP-24 is the standard ordering option unless otherwise specified. Thermal pad on QFN-32 must be isolated from digital ground and may connect to analog ground.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH A0+/CH A0– | Differential Analog Input Pair A0 | Simultaneously sampled with CH B0±; supports ±2.5V bipolar input centered at internal 2.5V reference. |
| CH A1+/CH A1– | Differential Analog Input Pair A1 | Second channel pair for A-side; selected via M0=1 or M0=0+A0=1; maintains phase alignment with B-side. |
| CH B0+/CH B0– | Differential Analog Input Pair B0 | Simultaneously sampled with CH A0±; used in motor current sensing (e.g., U/V phases) with matched acquisition timing. |
| CH B1+/CH B1– | Differential Analog Input Pair B1 | Second B-side channel; enables four-channel sequential mode when M0=1, preserving inter-pair timing integrity. |
| CONVST | Conversion Start Trigger | Rising-edge synchronous hold command; initiates simultaneous sample-to-hold transition independent of CLOCK edge timing. |
| M0/M1/A0 | Mode & Channel Select Inputs | Configure two- or four-channel operation, channel pair selection (A0/B0 vs A1/B1), and serial output routing (A+B vs A-only). |
| SERIAL DATA A / B | Serial Output Data Lines | MSB-first 12-bit words with status flags; DATA B tri-stated when M1=1; RD-synchronized valid window starts after third CLOCK rising edge. |
| REFIN / REFOUT | Reference Interface Pins | REFOUT provides buffered 2.5V; direct connection to REFIN enables internal reference use; external reference must be ≤2.6V and ≥1.2V. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous Sampling | Two independent SAR cores acquire CH A0/B0 or CH A1/B1 at identical instants - critical for vector-controlled motor phase angle reconstruction. |
| 80dB Common-Mode Rejection | Maintained at 50kHz; enables clean acquisition in noisy industrial environments (e.g., PWM-driven inverters) without external instrumentation amps. |
| Low Aperture Jitter (50ps) | Ensures <0.02° phase error at 10kHz input - essential for high-fidelity current/voltage synchronization in 3-phase power control. |
| Four-Channel Flexibility | M0/M1/A0 logic supports two-channel (A0/B0 or A1/B1), dual-two-channel (A0/B0 + A1/B1), or sequential four-channel modes without firmware reconfiguration. |
| Bipolar Input Support | Native ±2.5V differential range referenced to internal 2.5V; eliminates need for external level-shifting in ±10V/±5V sensor interfaces using OPA132-based circuits. |
Applications
| Motor Control | Multi-Axis Positioning Systems |
|---|---|
Use Scenario: Real-time measurement of three-phase motor currents (U/V/W) and DC bus voltage for field-oriented control (FOC) algorithms. IC Role / Device Role / Timing Role: Simultaneous sampling of two current channels (e.g., U and V) preserves phase relationship; fourth channel captures bus voltage or temperature feedback. Use Value: Enables accurate torque estimation and commutation timing with <100ps inter-channel skew - directly improving motor efficiency and reducing acoustic noise. |
Use Scenario: Coordinated position feedback from multiple linear/rotary encoders in CNC machines or robotic arms. IC Role / Device Role / Timing Role: Dual-channel simultaneous capture of encoder A/B quadrature signals per axis; four-channel mode supports up to two axes with synchronized timestamping. Use Value: Eliminates interpolation errors between axes during high-speed motion profiling, ensuring sub-micron positional repeatability. |
| 3-Phase Power Control | Industrial Sensor Signal Conditioning |
Use Scenario: Monitoring line-to-line voltages and phase currents in active rectifiers or grid-tie inverters operating at 50/60Hz with harmonic content up to 2kHz. IC Role / Device Role / Timing Role: Simultaneous acquisition of voltage and current on same phase (e.g., Vab + Ia) enables instantaneous power calculation without phase-induced reactive power error. Use Value: Achieves >99.5% fundamental accuracy in RMS and THD measurements due to matched gain/offset (<0.5 LSB) and 80dB CMRR at switching frequencies. |
Use Scenario: Digitizing outputs from strain gauges, RTDs, or piezoelectric sensors in harsh factory-floor environments with EMI from VFDs and solenoids. IC Role / Device Role / Timing Role: Fully differential inputs reject common-mode noise; internal 2.5V reference eliminates external reference drift; 125°C rating supports under-hood deployment. Use Value: Delivers stable 12-bit linearity (±0.75 LSB) without calibration over –40°C to +125°C - reducing BOM cost and test time. |
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-ended inputs only; 16-bit resolution; 500kSPS; SPI interface; no internal reference. | Lacks simultaneous sampling and differential inputs - unsuitable for phase-critical motor control. | Select only for high-resolution single-channel applications where phase alignment is irrelevant. |
| AD7656ASTZ | 6-channel simultaneous sampling; 16-bit; ±5V input range; parallel/serial interface; higher power (120mW). | Over-specified channel count and resolution for dual-axis systems; requires external reference and more complex layout. | Prefer when scaling to six-phase systems or needing >12-bit precision with guaranteed simultaneity across all channels. |
Compared with ADS8327IPW and AD7656ASTZ, the ADS7861E uniquely balances 12-bit simultaneous dual-channel acquisition, integrated 2.5V reference, low 40mW power, and robust –40°C to +125°C operation - making it optimal for cost-sensitive, space-constrained motor drives and positioning controllers where phase fidelity and thermal resilience are non-negotiable.
Availability
ADS7861E 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 ADS7861E 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 ADS7861E belongs to TI's high-speed precision SAR ADC product line, engineered specifically for real-time closed-loop control systems demanding simultaneous sampling, wide temperature operation, and noise-immune differential acquisition.
FAQ
What is the maximum sampling rate supported by the ADS7861E?
The ADS7861E supports a maximum throughput rate of 500kSPS per channel. This requires an external 8MHz clock (16 clock cycles per 12-bit conversion). At lower clock frequencies, the effective sampling rate scales linearly - e.g., a 4MHz clock yields 250kSPS. The device maintains simultaneous sampling integrity across both channel pairs regardless of clock speed.
Does the ADS7861E require an external reference voltage?
No, the ADS7861E includes an internal 2.5V reference with ±25ppm/°C drift and 50µVPP noise, accessible via REFOUT and usable by connecting REFOUT directly to REFIN. An external reference between 1.2V and 2.6V may be applied to REFIN for customized full-scale ranges, but is not required for standard ±2.5V operation.
How does the ADS7861E achieve simultaneous sampling across two channels?
The ADS7861E integrates two independent sample-and-hold amplifiers and SAR ADC cores. When CONVST rises, both S/H circuits switch to hold mode at the same instant - capturing CH A0/B0 or CH A1/B1 simultaneously. This hardware-level synchronization ensures <100ps inter-channel aperture mismatch, preserving phase relationships critical for motor current reconstruction.
What package options are available for the ADS7861E?
The ADS7861E is offered in SSOP-24 (standard) and QFN-32 packages. Both share identical pin functions and electrical specifications. The SSOP-24 is leaded and compatible with standard reflow and inspection processes; the QFN-32 features a thermal pad (internally connected to substrate) that may be tied to AGND for improved thermal performance in high-power-density layouts.
Can the ADS7861E interface directly with a 3.3V microcontroller?
Yes - the ADS7861E digital I/O (CS, RD, CONVST, M0/M1/A0, DATA A/B) is CMOS-compatible with VIH ≥3.0V and VIL ≤1.0V at +5V supply, making it interoperable with 3.3V logic when driven by microcontrollers with 5V-tolerant inputs. For 3.3V-only systems, level-shifting is recommended on outputs if DATA A/B drive 5V-referenced receivers.
ADS7861E Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-SSOP (0.154", 3.90mm Width)
- Packaging:
- Bulk
- 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:
- -
ADS7861E FAQ
1.How can I place an order for ADS7861E through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7861E 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 ADS7861E reliable?
The price and inventory of ADS7861E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7861E is usually 5 days.
3.What payment methods are accepted for ADS7861E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7861E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7861E?
ADS7861E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7861E 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 ADS7861E?
For technical support, including ADS7861E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7861E requirements.
6.How does Aetrix verify that ADS7861E is sourced from the original manufacturer or authorized distributors?
All ADS7861E 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 ADS7861E meets industry standards.
7.What is the process for return or replacement of ADS7861E?
All ADS7861E units undergo pre-shipment inspection (PSI). If there is an issue with ADS7861E, 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 ADS7861E part is unused and in its original packaging.
Return procedure for ADS7861E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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