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Texas Instruments ADS7864YB/250G4
- Part No.:
- ADS7864YB/250G4
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-TQFP
- Datasheet:
-
ADS7864YB/250G4.pdf
- Description:
- IC ADC 12BIT SAR 48TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,453
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Product details
Overview
ADS7864YB/250G4 from Texas Instruments is a dual 12-bit, 500kHz simultaneous-sampling analog-to-digital converter with six fully differential input channels (A0/A1, B0/B1, C0/C1), internal 2.5V reference, parallel interface, and 2µs total throughput per channel-designed for high-precision motor control and multi-axis positioning systems.
For engineers reviewing the ADS7864YB/250G4 datasheet, ADS7864YB/250G4 pinout, ADS7864YB/250G4 application, or ADS7864YB/250G4 equivalent, key selection criteria include simultaneous sampling capability across three channel pairs, ±0.5% positive gain error, 80dB common-mode rejection at 50kHz, FIFO buffering, and TQFP-48 package compatibility with industrial temperature range (–40°C to +85°C).
Technical Context
The ADS7864YB/250G4 integrates two independent SAR ADC cores, each servicing three differential channel pairs via dedicated sample-and-hold amplifiers. Hold signals (HOLDA/HOLDB/HOLDC) initiate simultaneous sampling on respective channel groups, preserving phase coherence across all six inputs.
It employs binary two's complement data format over a 16-bit parallel bus (DB0–DB15), with address/control pins (A0–A2, BYTE, RD, CS) enabling single-channel read, cycling mode, or 6× FIFO access. Internal 2.5V reference (±0.025V accuracy, 10ppm/°C drift) supports bipolar input ranges up to ±2.5V with 12-bit no-missing-codes performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR architecture ensures monotonic output with no missing codes across full operating range. |
| Sampling Rate | 500kHz per channel with simultaneous acquisition-enables real-time capture of synchronized three-phase waveforms. |
| Input Configuration | Six fully differential inputs grouped as A0/A1, B0/B1, C0/C1-supports isolated current/voltage sensing in motor drives. |
| Reference | Internal 2.5V ±0.025V reference (10ppm/°C drift); external reference support from 1.2V to 2.6V allows system-level scaling. |
| Power Dissipation | 50mW at +5V supply-enables thermally constrained embedded designs without active cooling. |
| Common-Mode Rejection | 80dB at 50kHz-critical for rejecting EMI in noisy industrial environments like VFDs and servo amplifiers. |
| Throughput Time | 2µs per channel-meets tight control-loop timing in digital power supplies and closed-loop motion systems. |
Pinout & Package
TQFP-48 package (PFB designation), 7mm × 7mm body, 0.5mm pitch, exposed thermal pad-optimized for high-density PCB layouts with low-inductance analog grounding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +VA, AGND (Pins 1, 2, 35, 36) | Analog power and ground | Separate analog domain prevents digital switching noise from corrupting conversion integrity. |
| +VD, DGND (Pins 21, 20) | Digital power and ground | Isolated digital supply reduces coupling into sensitive analog front-end during parallel bus activity. |
| HOLDA, HOLDB, HOLDC (Pins 27, 26, 25) | Channel group hold triggers | Independent strobing enables flexible synchronization-e.g., HOLDA+HOLDB for four-channel capture before C-group. |
| CH A0+/A0− to CH C1+/C1− (Pins 37–48) | Differential analog inputs | Full differential path from input pins through S/H amps to SAR core preserves CMRR and dynamic range. |
| DB0–DB15, RD, CS, BUSY (Pins 3–18, 19, 23, 24) | Parallel data interface | 16-bit wide bus with handshaking (RD/CS/BUSY) minimizes software overhead in real-time DSP/FPGA interfacing. |
| REFIN/REFOUT (Pins 34, 33) | Reference I/O | REFOUT → REFIN loop configures internal 2.5V reference; REFIN accepts external sources for precision calibration. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous Sampling | Three independent hold signals enable true time-aligned capture across all six channels-essential for vector control algorithms. |
| 6× FIFO Buffering | Stores latest conversion results for all six channels-eliminates data loss during burst reads in high-throughput applications. |
| Bipolar Input Support | Accepts ±2.5V, ±5V, ±10V via external level-shift circuitry-enables direct interface with industrial transducers and isolation amplifiers. |
| Low Aperture Jitter | 50ps typical-ensures <71dB SINAD at 100kHz input, critical for accurate FFT-based diagnostics in power quality analyzers. |
| CMOS-Compatible Interface | VIH ≥3.0V, VOL ≤0.4V at 500µA-guarantees robust interoperability with FPGA I/O banks and microcontroller parallel ports. |
Applications
| Motor Control | Multi-Axis Positioning Systems |
|---|---|
Use Scenario: Real-time current and voltage sampling in three-phase PMSM/BLDC servo drives for field-oriented control (FOC). IC Role / Device Role / Timing Role: Simultaneous capture of phase currents (A/B/C) and DC-link voltage with sub-2µs latency to maintain torque ripple <5%. Use Value: HOLDA/HOLDB/HOLDC coordination preserves phase relationships between current and voltage waveforms-enabling precise dq-axis transformation. |
Use Scenario: Coordinated position feedback acquisition from six linear encoders in CNC machine tool gantries. IC Role / Device Role / Timing Role: Six-channel synchronized sampling at 500kHz provides jitter-free position deltas for real-time interpolation and jerk-limited trajectory planning. Use Value: 80dB CMRR rejects ground-loop noise from multiple servo amplifier outputs-improving encoder resolution stability by >3 LSB. |
| 3-Phase Power Control | Industrial Data Acquisition |
Use Scenario: Voltage and current monitoring in active front-end rectifiers and grid-tied inverters for renewable energy systems. IC Role / Device Role / Timing Role: Dual SAR cores acquire line-to-line voltages and phase currents simultaneously to compute instantaneous power and harmonic content. Use Value: Internal 2.5V reference with 10ppm/°C drift ensures <0.1% gain drift over –40°C to +85°C-meeting IEC 61000-4-30 Class A accuracy. |
Use Scenario: High-fidelity transient capture in portable power quality analyzers requiring >12-bit ENOB at 100kHz bandwidth. IC Role / Device Role / Timing Role: 40MHz S/H bandwidth and 120µVRMS noise floor support clean 71dB SINAD for spectral analysis of distorted waveforms. Use Value: FIFO mode buffers six full cycles of 500kHz data-enabling gap-free recording of 10ms transients without host CPU intervention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar simultaneous-sampling ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8364IPAG | 16-bit resolution, 250kSPS, same TQFP-64 package but higher pin count; no internal reference-requires external REF5025. | Targeted at higher-precision metrology where 12-bit quantization noise is insufficient; lacks integrated FIFO. | Select ADS8364IPAG when ENOB >13.5 bits is required and board layout accommodates larger footprint and external reference design. |
| AD7656ASTZ | 16-bit, 250kSPS, six-channel simultaneous sampling; uses serial SPI interface instead of parallel; ±0.003% INL vs ADS7864YB's ±0.5 LSB. | Preferred in space-constrained designs where FPGA resource count limits parallel bus usage; lower power (30mW). | Choose AD7656ASTZ when system MCU/FPGA lacks wide parallel I/O but supports high-speed SPI, and thermal budget is tighter. |
Compared with ADS8364IPAG and AD7656ASTZ, the ADS7864YB/250G4 delivers optimal balance of speed (500kHz), integration (internal reference, FIFO), and interface simplicity (parallel bus) for cost-sensitive industrial motion control-without requiring external support components or sacrificing deterministic timing.
Availability
ADS7864YB/250G4 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 ADS7864YB/250G4 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 ADS7864YB/250G4 belongs to TI's high-speed simultaneous-sampling ADC product line, engineered specifically for real-time closed-loop control in motor drives, power electronics, and automated test equipment where phase coherence and deterministic latency are non-negotiable.
FAQ
What is the guaranteed gain error specification for ADS7864YB/250G4?
The ADS7864YB/250G4 has a maximum positive gain error of ±0.5% of full-scale range and ±0.5% for negative gain error, measured at TMIN to TMAX with +VA = +VD = +5V, fCLK = 8MHz, and internal 2.5V reference. This tighter spec versus the ADS7864Y (±0.75%) reflects enhanced factory trimming for high-accuracy applications like servo current sensing.
Does ADS7864YB/250G4 support external reference voltage?
Yes, the ADS7864YB/250G4 supports external reference voltages from 1.2V to 2.6V applied to the REFIN pin (Pin 34). When using an external reference, the internal reference buffer isolates the CDAC from load variations, maintaining conversion accuracy while allowing system-level calibration traceability.
How does the FIFO mode operate in ADS7864YB/250G4?
In FIFO mode (A2A1A0 = 111), the ADS7864YB/250G4 stores the latest conversion result for each of the six channels in dedicated registers. Data is read in first-converted-first-out order-e.g., if HOLDA triggers first, CH A0 data appears first on the bus-enabling continuous streaming without channel-address overhead.
What is the minimum acquisition time required before conversion starts in ADS7864YB/250G4?
The ADS7864YB/250G4 requires a minimum acquisition time of 0.25µs after the HOLDX signal goes low, as specified under electrical characteristics at fCLK = 8MHz. This ensures the internal capacitor array settles to 12-bit accuracy before SAR conversion begins-critical for maintaining SNR >71dB.
Can ADS7864YB/250G4 interface directly with a 3.3V FPGA I/O bank?
No-the ADS7864YB/250G4 is a 5V-only device: its digital interface (RD, CS, DB0–DB15) operates at CMOS levels referenced to +VD = +5V, with VIH ≥3.0V and VOL ≤0.4V at 500µA. Direct connection to 3.3V FPGA I/O requires level-shifting circuitry to avoid damage and ensure logic threshold compliance.
ADS7864YB/250G4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 48-TQFP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 500k
- Number of Inputs:
- 6
- Input Type:
- Differential
- Data Interface:
- SPI
- Configuration:
- S/H-MUX-ADC
- Ratio - S/H:ADC:
- 3:1
- 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:
- 48-TQFP (7x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS7864YB/250G4 FAQ
1.How can I place an order for ADS7864YB/250G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7864YB/250G4 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 ADS7864YB/250G4 reliable?
The price and inventory of ADS7864YB/250G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7864YB/250G4 is usually 5 days.
3.What payment methods are accepted for ADS7864YB/250G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7864YB/250G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7864YB/250G4?
ADS7864YB/250G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7864YB/250G4 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 ADS7864YB/250G4?
For technical support, including ADS7864YB/250G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7864YB/250G4 requirements.
6.How does Aetrix verify that ADS7864YB/250G4 is sourced from the original manufacturer or authorized distributors?
All ADS7864YB/250G4 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 ADS7864YB/250G4 meets industry standards.
7.What is the process for return or replacement of ADS7864YB/250G4?
All ADS7864YB/250G4 units undergo pre-shipment inspection (PSI). If there is an issue with ADS7864YB/250G4, 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 ADS7864YB/250G4 part is unused and in its original packaging.
Return procedure for ADS7864YB/250G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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