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Texas Instruments ADS7862Y/2K
- Part No.:
- ADS7862Y/2K
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 32-TQFP
- Datasheet:
-
ADS7862Y/2K.pdf
- Description:
- IC ADC 12BIT SAR 32TQFP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
ADS7862Y/2K 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, guaranteed no missing codes, and parallel CMOS interface - designed for high-precision motor control and multi-axis positioning systems requiring phase-coherent signal acquisition.
For engineers reviewing the ADS7862Y/2K datasheet, ADS7862Y/2K pinout, ADS7862Y/2K application, or ADS7862Y/2K equivalent, key selection criteria include simultaneous dual-channel sampling capability, ±0.75 LSB integral linearity (ADS7862Y grade), internal 2.5V reference with 80dB CMRR at 50kHz, TQFP-32 package compatibility, and 500kHz channel throughput under 8MHz clock.
Technical Context
The ADS7862Y/2K implements two independent successive approximation register (SAR) ADCs with synchronized sample-and-hold amplifiers, enabling true simultaneous sampling across two channel pairs (A0/B0 and A1/B1). Its fully differential analog front-end maintains signal integrity through differential routing to the SAR core, delivering 80dB common-mode rejection at 50kHz and 40MHz small-signal bandwidth.
Control is managed via dedicated digital inputs: CONVST initiates conversion on both channels simultaneously, BUSY indicates active conversion, and RD/CS/A0 coordinate parallel readout of 12-bit two's complement data from dual output registers. The device operates from a single +5V supply and supports internal or external reference (1.2V–2.6V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR architecture with guaranteed no missing codes - ensures monotonicity and deterministic full-scale transition behavior in closed-loop control. |
| Sampling Rate | 500kHz per channel with simultaneous acquisition - preserves phase relationship between paired channels (e.g., A0/B0) for vector control algorithms. |
| Throughput Time | 2µs per channel (1.75µs conversion + 0.25µs acquisition) - enables real-time feedback within <2µs latency critical for servo loop stability. |
| Integral Linearity | ±0.75 LSB (max) - limits position error to <0.018% FSR in precision motion systems using ±2.5V input range. |
| Common-Mode Rejection | 80dB at 50kHz - suppresses EMI-coupled noise in industrial motor drives with high dv/dt switching waveforms. |
| Power Dissipation | 40mW at 5V - supports thermally constrained PCB layouts in compact drive modules without forced cooling. |
| Reference | Internal 2.5V ±10mV (2.475–2.525V), 25ppm/°C drift - eliminates external reference component while maintaining <±0.4°C thermal offset drift in 0–85°C operation. |
Pinout & Package
TQFP-32 package (PBS designation), 7mm × 7mm body, 0.5mm pitch, exposed thermal pad - compatible with standard reflow profiles and automated optical inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH A0+/CH A0– CH A1+/CH A1– CH B0+/CH B0– CH B1+/CH B1– | Differential analog inputs (4 channels) | Two independently selectable channel pairs (A0/A1 and B0/B1); A0 pin selects active pair during CONVST; fully differential topology rejects common-mode noise. |
| REFIN / REFOUT | Reference input/output | REFOUT provides internal 2.5V reference; direct connection to REFIN enables self-contained operation; supports external 1.2–2.6V reference for custom full-scale ranges. |
| CONVST | Conversion start trigger | Falling edge initiates simultaneous hold-and-convert on both channel pairs; minimum 15ns pulse width required for reliable latching. |
| BUSY | Conversion status indicator | Active-HIGH signal asserts for 1.75µs - used for hardware handshaking or interrupt-driven read timing in microcontroller interfaces. |
| RD / CS / A0 | Parallel read control | RD falling edge toggles between Channel A and B output registers; CS enables bus drivers; A0 selects input pair (0=A0/B0, 1=A1/B1) and output register mapping. |
| DB0–DB11 | Parallel data bus | 12-bit two's complement output (MSB DB11 → LSB DB0); tri-stated when CS or RD is HIGH - enables shared bus architectures with multiple ADCs. |
| +VA / +VD / AGND / DGND | Power and ground | +VA/+VD = 4.75–5.25V analog/digital supplies; AGND/DGND must be connected externally with ≤0.3V potential difference to avoid ground-loop induced offset errors. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous dual-channel sampling | Preserves exact time alignment between channel pairs (e.g., phase A/B current sensing), eliminating inter-channel skew that degrades field-oriented control accuracy. |
| Fully differential input architecture | Enables direct connection to isolated current shunt amplifiers or resolver-to-digital converters without level-shifting circuitry, reducing BOM count and layout complexity. |
| Internal 2.5V reference with buffer | Provides stable reference for both ADCs with 2mA source capability - eliminates need for external reference IC while supporting moderate capacitive loads (<100pF). |
| Parallel CMOS interface | Minimizes software overhead in real-time systems: 12-bit data available in one bus cycle after RD assertion, avoiding SPI/I²C protocol latency and DMA configuration. |
| Guaranteed no missing codes | Ensures deterministic transfer function across full temperature range (–40°C to +85°C), critical for safety-critical applications like overcurrent protection where code gaps cause false trips. |
Applications
| Motor Control | Multi-Axis Positioning Systems |
|---|---|
Use Scenario: Real-time current sensing in three-phase PMSM/BLDC inverters using shunt resistors on all three legs. IC Role / Device Role / Timing Role: Simultaneously samples phase A and B currents with sub-2µs latency to compute instantaneous torque vector in FOC algorithms. Use Value: Eliminates inter-channel timing skew that causes >0.5% torque ripple; enables >20kHz PWM carrier synchronization without phase error accumulation. |
Use Scenario: Coordinated position feedback acquisition from linear encoders on X/Y/Z axes in CNC machine tools. IC Role / Device Role / Timing Role: Captures synchronized position snapshots across all axes using A0/B0 and A1/B1 channel pairs during motion profiling. Use Value: Maintains <100ps aperture matching between channels - reduces contouring error by up to 40% compared to sequential-sampling ADCs in high-speed machining. |
| 3-Phase Power Control | Industrial Data Acquisition |
Use Scenario: Voltage and current monitoring in grid-tied solar inverters with isolation amplifiers on DC-link and AC output. IC Role / Device Role / Timing Role: Samples DC voltage (A0+/A0–) and AC line current (B0+/B0–) simultaneously to compute real-time power factor and harmonic content. Use Value: Enables IEEE 1459-compliant power calculations with <0.1% measurement uncertainty due to matched gain/offset across channels. |
Use Scenario: High-fidelity vibration analysis in predictive maintenance systems using piezoelectric accelerometers on rotating machinery. IC Role / Device Role / Timing Role: Acquires synchronized signals from orthogonal accelerometer axes (X/Y/Z) to reconstruct 3D vibration spectra via FFT. Use Value: 40MHz analog bandwidth and 71dB SINAD at 100kHz support accurate detection of bearing fault frequencies up to 10kHz with <0.5dB amplitude error. |
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 |
|---|---|---|---|
| ADS8326IPW | 16-bit resolution, 500kSPS, serial SPI interface, no internal reference - requires external REF3025 and level-shifting for 5V logic. | Lacks simultaneous sampling; uses time-interleaved conversion - introduces 25ns inter-channel skew unsuitable for vector control. | Select only when higher resolution outweighs phase coherence requirements and SPI interface is preferred for reduced pin count. |
| AD7656ASTZ | 6-channel simultaneous sampling, 16-bit, 250kSPS, parallel interface, internal reference - larger 64-lead LQFP package and 120mW power dissipation. | Higher channel count but lower throughput per channel; slower conversion time (3.5µs) limits control loop bandwidth to ≤150kHz. | Choose for multi-sensor systems needing >4 channels (e.g., 3-phase voltage/current + temperature) where 250kSPS suffices and thermal management allows. |
Compared with ADS8326IPW and AD7656ASTZ, the ADS7862Y/2K uniquely balances 12-bit precision, true simultaneous dual-channel acquisition, low-latency parallel interface, and 40mW power - making it optimal for cost-sensitive, space-constrained motor drives requiring <2µs deterministic timing.
Availability
ADS7862Y/2K 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 (–40°C to +85°C) and long production lifecycles.
Supply support for ADS7862Y/2K 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 acquisition and industrial control solutions.
The ADS7862 belongs to TI's high-speed precision ADC product line, engineered specifically for real-time industrial automation applications demanding simultaneous sampling, low latency, and robust noise immunity in electrically noisy environments.
FAQ
What is the maximum sampling rate supported by the ADS7862Y/2K?
The ADS7862Y/2K supports a maximum channel sampling rate of 500kHz with simultaneous acquisition across two channel pairs. This is achieved using an 8MHz external clock (fCLK = 16 × fSAMPLE). At this rate, each channel completes conversion in 2µs (1.75µs conversion + 0.25µs acquisition), and the ADS7862Y/2K maintains ±0.75 LSB integral linearity and 80dB CMRR at 50kHz.
Does the ADS7862Y/2K require an external reference voltage?
No, the ADS7862Y/2K includes an internal 2.5V reference with ±10mV initial accuracy and 25ppm/°C drift, accessible via REFOUT and connected directly to REFIN. An external reference (1.2V–2.6V) may be used for custom full-scale ranges, but the ADS7862Y/2K operates fully functional with its internal reference - eliminating BOM cost and board space for external references.
How does the ADS7862Y/2K handle simultaneous sampling across channels?
The ADS7862Y/2K uses two independent sample-and-hold amplifiers and SAR cores, triggered synchronously by a single CONVST pulse. When CONVST goes LOW, both S/H amplifiers enter hold mode simultaneously, freezing analog inputs for A0/B0 or A1/B1 (selected by A0 state). This guarantees <100ps aperture delay matching - preserving phase relationships critical for vector control and power quality analysis in the ADS7862Y/2K.
What is the purpose of the A0 pin on the ADS7862Y/2K?
The A0 pin on the ADS7862Y/2K serves a dual function: during CONVST assertion, it selects which channel pair is sampled (A0 LOW = A0/B0; A0 HIGH = A1/B1); during RD read cycles, it determines whether Channel A or B data appears on the bus after each RD falling edge. This dual-role design enables flexible channel mapping without additional address lines - a key efficiency feature of the ADS7862Y/2K architecture.
Can the ADS7862Y/2K operate from a single 5V supply?
Yes, the ADS7862Y/2K is specified to operate from a single +5V supply (±5% tolerance: 4.75V to 5.25V) applied to both +VA (analog) and +VD (digital) pins. Internal regulation and separate AGND/DGND pins maintain noise isolation. Total quiescent current is 8mA typical, resulting in 40mW total power dissipation - verified across the full –40°C to +85°C industrial temperature range for the ADS7862Y/2K.
ADS7862Y/2K 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:
- -
ADS7862Y/2K FAQ
1.How can I place an order for ADS7862Y/2K through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7862Y/2K 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 ADS7862Y/2K reliable?
The price and inventory of ADS7862Y/2K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7862Y/2K is usually 5 days.
3.What payment methods are accepted for ADS7862Y/2K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7862Y/2K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7862Y/2K?
ADS7862Y/2K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7862Y/2K 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 ADS7862Y/2K?
For technical support, including ADS7862Y/2K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7862Y/2K requirements.
6.How does Aetrix verify that ADS7862Y/2K is sourced from the original manufacturer or authorized distributors?
All ADS7862Y/2K 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 ADS7862Y/2K meets industry standards.
7.What is the process for return or replacement of ADS7862Y/2K?
All ADS7862Y/2K units undergo pre-shipment inspection (PSI). If there is an issue with ADS7862Y/2K, 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 ADS7862Y/2K part is unused and in its original packaging.
Return procedure for ADS7862Y/2K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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