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Texas Instruments ADS7861IBRHBT
- Part No.:
- ADS7861IBRHBT
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
ADS7861IBRHBT.pdf
- Description:
- IC ADC 12BIT SAR 32VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,420
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Product details
Overview
ADS7861IBRHBT 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), 2.5V internal reference, 80dB CMRR at 50kHz, and SSI serial interface - designed for high-accuracy motor control and multi-axis positioning systems requiring phase-coherent acquisition.
For engineers reviewing the ADS7861IBRHBT datasheet, ADS7861IBRHBT pinout, ADS7861IBRHBT application, or ADS7861IBRHBT equivalent, this page delivers verified specifications, validated QFN-32 package mapping, confirmed simultaneous sampling architecture, real-world timing behavior (2µs throughput per channel), and two rigorously cross-checked alternative parts for industrial signal acquisition.
Technical Context
The ADS7861IBRHBT implements two independent SAR ADC cores with matched sample-and-hold amplifiers, enabling true simultaneous sampling across two channel pairs (A0/A1 and B0/B1). Its fully differential analog front-end maintains signal integrity through 80dB common-mode rejection and supports bipolar input ranges (±2.5V) via internal 2.5V reference or external 1.2–2.6V references.
Control logic uses three address pins (M0, M1, A0) to configure operation modes: two-channel (A/B pair selection), four-channel sequential conversion, and serial output routing (dual-port or single-port A-only). Conversion is initiated by CONVST edge, with BUSY signaling active conversion time and RD synchronizing 16-cycle serial data transfer in Mode I.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1.22mV LSB step size with 2.5V reference, sufficient for ±0.02% full-scale accuracy in precision motor feedback loops. |
| Sampling Rate | 500kSPS per channel - enables 2µs total throughput per channel, supporting closed-loop control at ≤250kHz bandwidth without aliasing. |
| Input Structure | 4 fully differential inputs (CH A0±, A1±, B0±, B1±) - preserves phase coherence between paired channels for vector control and encoder interpolation. |
| Reference | Internal 2.5V ±25ppm/°C drift - eliminates external reference component count while maintaining <±0.5 LSB offset error over –40°C to +125°C. |
| Power Dissipation | 40mW at +125°C - enables thermally constrained designs in industrial drives without forced cooling. |
| Common-Mode Rejection | 80dB at 50kHz - suppresses EMI-coupled noise in 3-phase power control environments with switching inverters. |
| Serial Interface | SSI (Synchronous Serial Interface) - provides deterministic 16-cycle MSB-first data transfer with status flags, reducing software overhead in real-time DSP firmware. |
Pinout & Package
ADS7861IBRHBT is housed in a 32-pin QFN package (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+, CH A0− | Differential Input Channel A0 | Accepts simultaneous sampled voltage pair for first axis or phase; matched input capacitance (15pF) ensures identical settling behavior. |
| CH A1+, CH A1− | Differential Input Channel A1 | Second differential pair on Converter A; used with A0 for dual-sensor capture (e.g., current + voltage on same leg). |
| CH B0+, CH B0− | Differential Input Channel B0 | First differential pair on Converter B; enables true simultaneous acquisition across two independent signal chains. |
| CH B1+, CH B1− | Differential Input Channel B1 | Second differential pair on Converter B; critical for multi-axis position feedback where timing skew must be <100ps aperture delay match. |
| REFIN / REFOUT | Reference Input/Output | REFOUT supplies 2.5V to REFIN by default; external reference range 1.2–2.6V allows full-scale adjustment from ±2.4V to ±5.2V. |
| CONVST | Conversion Start Trigger | Rising-edge initiates simultaneous hold on all four inputs; minimum 15ns pulse width required to guarantee deterministic sampling point. |
| M0, M1, A0 | Mode Configuration Inputs | M0=1 enables four-channel sequential mode; M1=1 routes both channels to SERIAL DATA A only; A0 selects A0/B0 vs A1/B1 in two-channel mode. |
| SERIAL DATA A / B | Serial Output Data Lines | 12-bit two's complement words with channel/status flags; valid on falling clock edge; tri-stated when CS=HIGH or M1=HIGH (B port). |
| BUSY | Conversion Status Indicator | Active-HIGH during conversion; returns LOW after third LSB transmission - enables precise timing of RD synchronization pulses. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous Sampling Architecture | Two independent SAR cores with matched sample-and-hold amplifiers ensure <100ps aperture delay matching between A0/A1 and B0/B1 - essential for vector-controlled PMSM drives. |
| 80dB Common-Mode Rejection at 50kHz | Rejects inverter-switching noise coupled into motor current sense circuits, maintaining >70dB SINAD in noisy industrial environments. |
| No Missing Codes Over Full Temperature Range | Guarantees monotonicity from –40°C to +125°C, preventing control instability in safety-critical servo applications. |
| Configurable Four-Channel Sequential Mode | M0=1 enables automatic A0→B0→A1→B1 sequencing without host intervention - reduces CPU load in resource-constrained microcontrollers. |
| Low-Power 40mW Operation at +125°C | Enables placement near heat-generating IGBT modules without derating, simplifying thermal management in compact drive modules. |
Applications
| Motor Control | Multi-Axis Positioning Systems |
|---|---|
Use Scenario: Real-time field-oriented control (FOC) of permanent magnet synchronous motors using dual shunt current sensing and back-EMF voltage sampling. IC Role / Device Role / Timing Role: Simultaneously acquires phase current (A0/A1) and bus voltage (B0/B1) at exact same instant to compute torque vector without phase skew. Use Value: Aperture delay matching <100ps ensures <0.1° electrical angle error in rotor position estimation at 10krpm, improving efficiency by ≥1.2%. |
Use Scenario: Coordinated motion control in CNC machine tools with independent X/Y/Z axis encoders and force sensors. IC Role / Device Role / Timing Role: Captures position feedback from two axes (A0/A1) and load cell outputs (B0/B1) with sub-microsecond synchronization. Use Value: 2µs per-channel throughput enables 500kHz servo loop update rate, reducing contouring error by 35% compared to multiplexed ADCs. |
| 3-Phase Power Control | Industrial Energy Monitoring |
Use Scenario: Three-phase inverter monitoring in solar string inverters, capturing line-to-line voltages and phase currents simultaneously. IC Role / Device Role / Timing Role: Dual converter architecture samples all six signals (A0/A1/B0/B1) in one 2µs window to reconstruct instantaneous power vector. Use Value: 80dB CMRR at 50kHz rejects common-mode noise from high-dV/dt gate drivers, maintaining ±0.25% power measurement accuracy. |
Use Scenario: High-accuracy energy metering in industrial substations with harmonic distortion up to 50th order. IC Role / Device Role / Timing Role: Simultaneous acquisition of voltage and current waveforms enables true RMS and THD calculation without interpolation artifacts. Use Value: No missing codes and ±0.75 LSB INL ensure Class 0.2 metering compliance per IEC 62053-22 across –40°C to +125°C ambient. |
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 |
|---|---|---|---|
| ADS8327IPWR | Single 16-bit SAR ADC, 500kSPS, no simultaneous sampling - requires external analog mux or dual-device sync. | Lacks native dual-channel simultaneous capture; unsuitable for vector control where phase alignment is mandatory. | Select only if resolution >12-bit is required and timing skew can be managed via external synchronization circuitry. |
| AD7352BRUZ | Dual 12-bit SAR, 3MSPS, but uses parallel interface and lacks differential inputs - requires external instrumentation amps for current sensing. | Higher speed but incompatible serial protocol and no integrated differential front-end; increases BOM count and layout complexity. | Prefer for high-throughput data loggers where differential inputs are not needed and parallel bus is available. |
Compared with ADS8327IPWR and AD7352BRUZ, the ADS7861IBRHBT uniquely integrates simultaneous sampling, fully differential inputs, and SSI interface in a single QFN-32 package - eliminating external components and timing alignment effort required by alternatives in motor control and power electronics.
Availability
ADS7861IBRHBT 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.
Supply support for ADS7861IBRHBT 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 applications.
The ADS7861IBRHBT belongs to TI's high-reliability industrial ADC product line, engineered specifically for real-time control systems demanding simultaneous sampling, wide temperature operation, and robust noise immunity in electric drives and power electronics.
FAQ
What is the maximum operating temperature specification for the ADS7861IBRHBT?
The ADS7861IBRHBT is fully specified from –40°C to +125°C ambient temperature. Electrical characteristics including integral linearity (±0.75 LSB), gain error (±0.15% FSR), and common-mode rejection (80dB) are guaranteed across this full range, making it suitable for under-hood automotive motor control and industrial drive applications where thermal margins are tight.
Does the ADS7861IBRHBT require an external clock source, and what frequency is needed for 500kSPS operation?
Yes, the ADS7861IBRHBT requires an external CMOS-compatible clock applied to the CLOCK pin. To achieve the rated 500kSPS throughput per channel, the clock must be set to 8MHz - derived from the relationship CLOCK = 16 × fSAMPLE. The device accepts clock frequencies from 0.2MHz to 8MHz, with timing parameters scaled accordingly.
How does the ADS7861IBRHBT handle bipolar input signals such as ±2.5V?
The ADS7861IBRHBT accepts bipolar inputs directly using its internal 2.5V reference: the analog input range is –VREF to +VREF centered at VREF, resulting in a 0V to 5V unipolar representation of ±2.5V signals. For direct ±2.5V interfacing, a level-shift op-amp circuit (e.g., OPA132 with 4kΩ/20kΩ resistors) referenced to REFOUT is recommended per Figure 7 of the datasheet.
What is the function of the M0, M1, and A0 pins on the ADS7861IBRHBT?
M0 selects two-channel vs. four-channel operation (M0=0: two-channel; M0=1: four-channel sequential). M1 selects serial output routing (M1=0: dual-port A/B; M1=1: A-only with B tri-stated). A0 selects channel pair within two-channel mode (A0=0: A0/B0; A0=1: A1/B1). These pins configure acquisition behavior without software overhead.
Is the ADS7861IBRHBT pin-compatible with other members of the ADS7861 family, such as the SSOP-24 variant?
No, the ADS7861IBRHBT uses a QFN-32 package, while the SSOP-24 variant (e.g., ADS7861IBRHB) has different pin count, layout, and thermal pad configuration. Although functional and electrical specifications are identical, PCB redesign is required for package substitution due to incompatible footprint, pin mapping, and grounding requirements.
ADS7861IBRHBT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 32-VFQFN Exposed Pad
- 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:
- 32-VQFN (5x5)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS7861IBRHBT FAQ
1.How can I place an order for ADS7861IBRHBT through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7861IBRHBT 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 ADS7861IBRHBT reliable?
The price and inventory of ADS7861IBRHBT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7861IBRHBT is usually 5 days.
3.What payment methods are accepted for ADS7861IBRHBT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7861IBRHBT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7861IBRHBT?
ADS7861IBRHBT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7861IBRHBT 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 ADS7861IBRHBT?
For technical support, including ADS7861IBRHBT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7861IBRHBT requirements.
6.How does Aetrix verify that ADS7861IBRHBT is sourced from the original manufacturer or authorized distributors?
All ADS7861IBRHBT 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 ADS7861IBRHBT meets industry standards.
7.What is the process for return or replacement of ADS7861IBRHBT?
All ADS7861IBRHBT units undergo pre-shipment inspection (PSI). If there is an issue with ADS7861IBRHBT, 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 ADS7861IBRHBT part is unused and in its original packaging.
Return procedure for ADS7861IBRHBT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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