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Texas Instruments ADS7862YB/250
- Part No.:
- ADS7862YB/250
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 32-TQFP
- Datasheet:
-
ADS7862YB/250.pdf
- Description:
- IC ADC 12BIT SAR 32TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:360
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Product details
Overview
ADS7862YB/250 from Texas Instruments is a dual 12-bit, 500kHz simultaneous-sampling analog-to-digital converter with four fully differential input channels (A0/A1/B0/B1), 2µs per-channel throughput, ±0.5 LSB integral linearity, and parallel CMOS interface - designed for high-precision motor control and multi-axis positioning systems.
For engineers reviewing the ADS7862YB/250 datasheet, ADS7862YB/250 pinout, ADS7862YB/250 application, or ADS7862YB/250 equivalent, key selection criteria include guaranteed no missing codes, 80dB CMRR at 50kHz, internal 2.5V reference with ±25ppm/°C drift, TQFP-32 package compatibility, and support for bipolar ±2.5V input ranges via external level shift.
Technical Context
The ADS7862YB/250 implements two independent successive-approximation register (SAR) ADCs with synchronized sample-and-hold amplifiers, enabling true simultaneous acquisition across channel pairs A0/A1 and B0/B1. Its fully differential analog front-end maintains signal integrity through 80dB common-mode rejection and 40MHz small-signal bandwidth.
Control is managed via dedicated CONVST, BUSY, RD, CS, CLOCK, and A0 pins - supporting interleaved conversion/read cycles at up to 500kHz effective sampling rate. The internal 2.5V reference (±0.1% initial accuracy, 2.475–2.525V over temperature) is double-buffered and capable of sourcing 2mA, while the parallel 12-bit output uses binary two's complement format with 16ns bus access time.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR architecture with guaranteed no missing codes - ensures monotonicity for closed-loop control stability. |
| Sampling Rate | 500kHz per channel with simultaneous sampling - preserves phase coherence between motor current and position feedback signals. |
| Integral Linearity | ±0.5 LSB max - enables <0.012% full-scale error in precision power measurement applications. |
| Common-Mode Rejection | 80dB at 50kHz - suppresses EMI-coupled noise in industrial 3-phase power control environments. |
| Throughput Time | 2µs total per channel - supports real-time current loop updates within 2µs latency budget. |
| Power Dissipation | 40mW at 5V supply - allows thermal integration into space-constrained motor drive PCBs without forced cooling. |
| Reference Voltage | Internal 2.5V ±0.1%, ±25ppm/°C drift - eliminates need for external precision reference in cost-sensitive designs. |
| Operating Temperature | –40°C to +85°C - qualified for under-hood automotive motor control and industrial servo amplifier use. |
Pinout & Package
TQFP-32 package with exposed thermal pad (PBS designation); 0.8mm pitch, 7mm × 7mm body; RoHS-compliant, moisture sensitivity level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 REFIN | Reference Input | Accepts internal 2.5V reference (via pin 2) or external 1.2–2.6V source - sets full-scale range from ±2.4V to ±5.2V. |
| 2 REFOUT | +2.5V Reference Output | Internally buffered 2.5V reference; must be connected directly to REFIN when using internal reference. |
| 3 AGND | Analog Ground | Separate ground return for analog circuitry; requires star-point connection to DGND (pin 23) to minimize digital coupling. |
| 4 +VA | Analog Power Supply | +5V analog supply; decoupled with 0.1µF ceramic + 10µF tantalum to AGND for low-noise SAR operation. |
| 5–16 DB11–DB0 | Parallel Data Bus | 12-bit MSB-first binary two's complement output; tri-stated unless CS and RD are both low. |
| 17 BUSY | Conversion Status Flag | Active-high open-drain signal indicating conversion in progress - used for interrupt-driven data capture. |
| 18 CONVST | Convert Start Trigger | Falling-edge initiated; latches inputs and starts simultaneous hold/conversion on both A and B channel pairs. |
| 19 CLOCK | External Timing Source | CMOS-compatible input; 8MHz clock yields 500kHz sampling (fCLK = 16 × fSAMPLE). |
| 20 CS | Chip Select | Active-low enable for parallel data bus - required with RD to assert output drivers. |
| 21 RD | Read Strobe | Two-edge read protocol: first falling edge selects Channel A register, second selects Channel B register. |
| 22 A0 | Channel Address Select | Configures simultaneous conversion pair: LOW → A0/B0; HIGH → A1/B1 - set ≥250ns before CONVST. |
| 23 DGND | Digital Ground | Logic ground return; tied directly to AGND (pin 3) at single point to prevent ground loops. |
| 24 +VD | Digital Power Supply | +5V digital supply; connected directly to +VA (pin 4) - shared rail reduces component count. |
| 25–32 CH B1+/–, B0+/–, A1+/–, A0+/– | Differential Analog Inputs | Four fully differential input pairs; each pair shares common-mode voltage range defined by VREF. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous Sampling | True concurrent acquisition across two independent channel pairs preserves phase relationships critical for vector-controlled motor drives. |
| Guaranteed No Missing Codes | Ensures monotonic transfer function across full 12-bit range - essential for stable PID loop behavior in closed-loop systems. |
| 80dB CMRR at 50kHz | Rejects high-frequency noise from switching power stages and adjacent IGBT gate drivers in 3-phase inverters. |
| Internal 2.5V Reference | Eliminates external reference IC and associated layout complexity while maintaining ±0.5 LSB gain match across all four channels. |
| Parallel CMOS Interface | Reduces software overhead vs SPI/I²C - enables deterministic 12-bit data capture in ≤25ns after RD assertion. |
| Bipolar Input Support | Accepts ±2.5V, ±5V, or ±10V ranges via simple op-amp level-shift circuit (Figure 7), simplifying sensor interfacing in industrial controls. |
Applications
| Motor Current Sensing | Multi-Axis Position Feedback |
|---|---|
Use Scenario: Real-time measurement of phase currents in 3-phase BLDC or PMSM motor drives using shunt resistors and differential amplifiers. IC Role / Device Role / Timing Role: Simultaneous sampling of A0/B0 (U/V phase) and A1/B1 (V/W phase) preserves instantaneous current vector magnitude and angle. Use Value: Enables field-oriented control (FOC) with <2µs inter-channel skew - critical for torque ripple reduction below 0.5%. |
Use Scenario: Acquisition of encoder quadrature signals and resolver outputs in CNC machine tool axes or robotic joints. IC Role / Device Role / Timing Role: Dual ADCs digitize position and velocity feedback from separate sensors on X/Y/Z axes with matched timing. Use Value: Achieves sub-micron positional accuracy by eliminating inter-channel sampling delay-induced phase errors in coordinated motion control. |
| 3-Phase Power Quality Monitoring | Industrial Servo Amplifier Feedback |
Use Scenario: Simultaneous voltage and current sampling across all three phases in energy metering or power analyzer subsystems. IC Role / Device Role / Timing Role: Four differential inputs capture line-to-line voltages and phase currents with synchronized timestamps. Use Value: Supports IEEE 1459-compliant harmonic analysis up to 50th order with <0.02% THD measurement uncertainty. |
Use Scenario: Closed-loop current and back-EMF sensing in high-bandwidth servo amplifier feedback paths. IC Role / Device Role / Timing Role: Simultaneous A/D conversion of motor winding currents and rotor position signals for adaptive commutation. Use Value: Delivers 500kHz update rate with ±0.5 LSB INL - enabling >10kHz current loop bandwidth in Class-D servo drives. |
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 |
|---|---|---|---|
| ADS8325IPW | Single 16-bit SAR ADC, 100kSPS, serial SPI interface - no simultaneous sampling capability. | Lacks dual-channel synchronization; suitable only for non-phase-critical single-sensor monitoring. | Select only when resolution >12-bit and sampling rate <100kSPS suffice, and phase coherence is not required. |
| AD7656ASTZ | 6-channel 16-bit simultaneous-sampling SAR ADC, 250kSPS, parallel interface - higher resolution but lower speed and larger footprint (64-lead LQFP). | Supports more channels but cannot reach 500kHz per channel; better for high-resolution power analyzers than high-speed motor control. | Choose when multi-channel count >4 and 16-bit resolution outweigh 500kHz throughput requirement. |
Compared with ADS8325IPW and AD7656ASTZ, the ADS7862YB/250 uniquely balances 12-bit precision, 500kHz dual-channel simultaneous sampling, TQFP-32 compactness, and integrated reference - making it optimal for cost- and size-constrained motor control designs requiring phase-coherent feedback.
Availability
ADS7862YB/250 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 industrial temperature ranges and long production lifecycles.
Supply support for ADS7862YB/250 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 ADS7862YB/250 belongs to TI's high-speed precision SAR ADC product line, engineered specifically for real-time industrial control applications demanding simultaneous sampling, low latency, and robust noise immunity in electrically noisy environments.
FAQ
What is the maximum sampling rate supported by the ADS7862YB/250?
The ADS7862YB/250 supports a maximum effective sampling rate of 500kHz per channel with simultaneous acquisition across its dual ADCs. This is achieved using an 8MHz external clock (fCLK = 16 × fSAMPLE). At this rate, the device delivers 2µs total throughput per channel, including 1.75µs conversion time and 0.25µs acquisition time - verified in the SBAS101B datasheet Electrical Characteristics table.
Does the ADS7862YB/250 require an external reference voltage?
No, the ADS7862YB/250 includes an internal 2.5V reference with ±0.1% initial accuracy and ±25ppm/°C drift, accessible via REFOUT (pin 2) and connected directly to REFIN (pin 1). An external reference (1.2–2.6V) may be used for custom full-scale ranges, but is not required - the internal reference meets all specifications for the ADS7862YB/250 grade across –40°C to +85°C.
How does the ADS7862YB/250 handle simultaneous sampling across four channels?
The ADS7862YB/250 uses two independent SAR ADCs with synchronized sample-and-hold amplifiers. When CONVST is asserted, both S/H circuits enter hold mode simultaneously, capturing A0/A1 and B0/B1 inputs at the exact same instant. Channel selection (A0/B0 vs A1/B1) is controlled by the A0 pin state prior to CONVST - ensuring phase coherence critical for vector control algorithms.
What is the significance of the ±0.5 LSB integral linearity specification for the ADS7862YB/250?
The ±0.5 LSB integral linearity (INL) of the ADS7862YB/250 means maximum deviation from ideal transfer function is ≤0.012% of full scale - translating to <1.22mV error with a 2.5V reference. This tight INL ensures accurate current/voltage reconstruction in closed-loop motor control, preventing limit-cycle oscillations and enabling precise torque regulation in servo systems.
Can the ADS7862YB/250 interface directly with a microcontroller without level-shifting?
Yes, the ADS7862YB/250 features CMOS-compatible digital I/O with VIH ≥3.0V and VIL ≤0.8V at +5V supply, matching standard 5V microcontrollers and FPGAs. Its parallel 12-bit bus (DB0–DB11), along with CONVST, BUSY, RD, and CS signals, operates natively at 5V logic levels - no level-shifting circuitry is needed for direct connection to industry-standard host processors.
ADS7862YB/250 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 32-TQFP
- 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 ~ 85°C
- Supplier Device Package:
- 32-TQFP (5x5)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS7862YB/250 FAQ
1.How can I place an order for ADS7862YB/250 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7862YB/250 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 ADS7862YB/250 reliable?
The price and inventory of ADS7862YB/250 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7862YB/250 is usually 5 days.
3.What payment methods are accepted for ADS7862YB/250?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7862YB/250 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7862YB/250?
ADS7862YB/250 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7862YB/250 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 ADS7862YB/250?
For technical support, including ADS7862YB/250 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7862YB/250 requirements.
6.How does Aetrix verify that ADS7862YB/250 is sourced from the original manufacturer or authorized distributors?
All ADS7862YB/250 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 ADS7862YB/250 meets industry standards.
7.What is the process for return or replacement of ADS7862YB/250?
All ADS7862YB/250 units undergo pre-shipment inspection (PSI). If there is an issue with ADS7862YB/250, 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 ADS7862YB/250 part is unused and in its original packaging.
Return procedure for ADS7862YB/250:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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