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Texas Instruments ADS7864YB/250
- Part No.:
- ADS7864YB/250
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-TQFP
- Datasheet:
-
ADS7864YB/250.pdf
- Description:
- IC ADC 12BIT SAR 48TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,274
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Product details
Overview
ADS7864YB/250 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 - used in high-speed motor control and multi-axis positioning systems requiring phase-coherent acquisition.
For engineers reviewing the ADS7864YB/250 datasheet, ADS7864YB/250 pinout, ADS7864YB/250 application, or ADS7864YB/250 equivalent, this page delivers verified specifications, TQFP-48 package mapping, FIFO register behavior, bipolar input handling, and validated alternative options for industrial motion control signal chains.
Technical Context
The ADS7864YB/250 integrates two independent SAR ADCs sharing a common 8MHz clock domain, each driving three differential sample-and-hold amplifiers with matched aperture delay (≤100ps) and 40MHz small-signal bandwidth. Its dual-converter architecture enables true simultaneous sampling across all six channels via HOLDA/HOLDB/HOLDC control signals.
It employs binary two's complement output format over a 16-bit parallel bus (DB0–DB15), with DB15 indicating data validity and DB14–DB12 encoding channel identity. The internal 2.5V reference exhibits ±1 LSB bipolar offset error and 10ppm/°C drift, while external reference support (1.2V–2.6V) allows full-scale range adjustment from 2.4V to 5.2V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR - delivers 1 LSB = ±0.5 mV at 2.5V reference, enabling precise current/voltage sensing in servo drives. |
| Sampling Rate | 500 kHz per channel - supports real-time closed-loop control of 3-phase motors with ≤2 µs latency between sample initiation and data latch. |
| Input Configuration | Fully differential, 6-channel (3 pairs) - preserves phase relationships between A/B/C axis signals in multi-axis position feedback. |
| Reference | Internal 2.5V ±0.5 LSB accuracy - eliminates external reference component count; REFIN/REFOUT pins allow buffered external reference integration. |
| Power Dissipation | 50 mW at +5V supply - enables thermally constrained PCB layouts in compact industrial I/O modules. |
| Common-Mode Rejection | 80 dB at 50 kHz - suppresses noise coupling in noisy motor drive environments with shared ground paths. |
| Integral Linearity | ±0.5 LSB max - ensures <0.012% gain error across full scale, critical for torque ripple minimization in field-oriented control. |
Pinout & Package
TQFP-48 package (PFB designation), 7mm × 7mm body, 0.5mm pitch, exposed thermal pad - optimized for thermal management in high-density motor control PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +VA, AGND (pins 1, 2, 35, 36) | Analog power and ground | Separate analog domain for precision conversion; requires dedicated low-noise LDO and 0.1µF/10µF decoupling per supply pin. |
| CH A0+/A0− to CH C1+/C1− (pins 37–48) | Differential analog inputs | Six fully isolated differential pairs - each pair shares hold control (HOLDA/B/C) for synchronized sampling across axes. |
| HOLDA, HOLDB, HOLDC (pins 27, 26, 25) | Channel group hold triggers | Edge-triggered synchronous sampling enable - falling edge initiates simultaneous hold/conversion on assigned channel pair. |
| DB0–DB15, RD, CS, BUSY (pins 3–18, 19, 23, 24) | Parallel data interface | 16-bit tristate bus with handshaking - RD/CS enable read; BUSY indicates conversion-in-progress; DB15 = data valid flag. |
| REFIN/REFOUT (pins 34, 33) | Reference input/output | Internal 2.5V reference buffer - direct connection (REFOUT→REFIN) enables self-contained operation; external reference supported up to 2.6V. |
Key Features
| Feature | Design Value |
|---|---|
| 6-channel simultaneous sampling | Preserves phase coherence across motor current/voltage feedback loops - essential for accurate field-oriented control vector calculation. |
| 2µs total throughput per channel | Enables 500kHz loop update rate in real-time DSP-based servo controllers without pipeline stalls or data aging. |
| 6× FIFO register architecture | Stores three conversions per channel pair - allows burst reads during idle CPU cycles, reducing software overhead in interrupt-driven firmware. |
| Bipolar input support (±2.5V, ±5V, ±10V) | Configurable via external op-amp level shift (e.g., OPA340 + 4-resistor network) - matches standard industrial sensor output ranges. |
| CMOS-compatible parallel interface | Direct connection to TI C2000 DSC GPIOs or FPGA I/O banks - eliminates protocol translation logic and timing uncertainty of SPI/I²C interfaces. |
Applications
| Motor Control | Multi-Axis Positioning Systems |
|---|---|
Use Scenario: Real-time current sensing in 3-phase PMSM/BLDC servo drives with field-oriented control. IC Role / Device Role / Timing Role: Simultaneous sampling of phase A/B/C currents and DC bus voltage to compute instantaneous torque and flux vectors. Use Value: 100ps aperture delay matching ensures <0.1° phase error at 10kHz fundamental, minimizing torque ripple and acoustic noise. |
Use Scenario: Coordinated motion control in CNC machines with X/Y/Z linear actuators and rotary encoders. IC Role / Device Role / Timing Role: Synchronized acquisition of position feedback (resolver/LVDT), load cell outputs, and thermal sensors across multiple axes. Use Value: 6-channel FIFO reduces host processor polling frequency by 6×, freeing CPU cycles for trajectory planning and safety monitoring. |
| 3-Phase Power Control | Industrial Data Acquisition |
Use Scenario: Digital power supply monitoring in active front-end rectifiers and inverters. IC Role / Device Role / Timing Role: Simultaneous capture of line voltage, line current, and DC link voltage for harmonic analysis and protection logic. Use Value: 80dB CMRR at 50kHz rejects common-mode noise from IGBT switching transients, improving RMS measurement accuracy by >3 LSB. |
Use Scenario: High-fidelity vibration monitoring in predictive maintenance systems for rotating machinery. IC Role / Device Role / Timing Role: Acquisition of accelerometer, temperature, and acoustic emission signals from multiple sensor nodes on a single board. Use Value: Internal 2.5V reference stability (10ppm/°C) maintains calibration integrity across –40°C to +85°C industrial operating range. |
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, 6-channel, SPI interface, no internal reference | Higher resolution but lower speed; SPI interface increases firmware overhead vs parallel bus | Choose when absolute precision > speed, and system already uses SPI peripherals |
| AD7656ASTZ | 16-bit resolution, 250kSPS, 6-channel, parallel interface, internal 2.5V reference | Same parallel interface but slower throughput (250kSPS vs 500kSPS); higher power (120mW) | Choose when legacy ADI ecosystem compatibility required and 250kSPS suffices |
Compared with ADS7864YB/250, ADS8364IPAG trades speed for resolution and adds serial interface complexity, while AD7656ASTZ matches the parallel interface but halves throughput and doubles power - making ADS7864YB/250 optimal for cost-sensitive, high-speed motor control where 12-bit precision is sufficient.
Availability
ADS7864YB/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.
Supply support for ADS7864YB/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 signal chain solutions.
The ADS7864YB/250 belongs to TI's high-speed simultaneous-sampling ADC product line, designed specifically for real-time motion control, power electronics monitoring, and industrial automation systems demanding phase-coherent multichannel acquisition.
FAQ
What is the maximum sampling rate achievable with ADS7864YB/250?
The ADS7864YB/250 achieves a guaranteed 500kHz sampling rate per channel when driven by an 8MHz external clock. This corresponds to 2µs total throughput per channel, including acquisition (0.25µs) and conversion (1.75µs) time. The device maintains this rate across its full –40°C to +85°C operating range with proper power supply decoupling and layout.
Does ADS7864YB/250 support external voltage references?
Yes, ADS7864YB/250 supports external references from 1.2V to 2.6V applied to the REFIN pin. When using an external reference, the internal 2.5V reference is disabled, and the full-scale range becomes 2× the external reference voltage (e.g., 2.4V to 5.2V). The internal reference buffer isolates the external source from CDAC loading effects.
How does the HOLDA/HOLDB/HOLDC interface enable simultaneous sampling in ADS7864YB/250?
In ADS7864YB/250, each HOLD signal controls a pair of channels: HOLDA for A0/A1, HOLDB for B0/B1, and HOLDC for C0/C1. A simultaneous falling edge on all three HOLD pins places all six sample-and-hold amplifiers into hold mode at the same instant, preserving phase relationships. Conversion then proceeds sequentially (A→B→C) but sampling is truly simultaneous.
What is the purpose of the BYTE pin on ADS7864YB/250?
The BYTE pin on ADS7864YB/250 enables 8-bit data bus compatibility. When BYTE = high, the 16-bit output word is split: first RD cycle outputs DB7–DB0 (LSB byte), second RD cycle outputs DB15–DB8 (MSB byte including DB15 data-valid flag). This reduces I/O pin count on microcontrollers with limited parallel bus width.
Can ADS7864YB/250 handle bipolar input signals like ±5V directly?
No, ADS7864YB/250 does not accept ±5V directly. Its analog inputs are rated for –VREF to +VREF (±2.5V) around the internal 2.5V reference. To interface ±5V signals, a level-shifting circuit (e.g., OPA340 with four resistors as shown in TI SBAS141A Figure 25) must be used to translate and scale the input to the device's allowable range.
ADS7864YB/250 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 48-TQFP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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/250 FAQ
1.How can I place an order for ADS7864YB/250 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7864YB/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 ADS7864YB/250 reliable?
The price and inventory of ADS7864YB/250 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7864YB/250 is usually 5 days.
3.What payment methods are accepted for ADS7864YB/250?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7864YB/250 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7864YB/250?
ADS7864YB/250 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7864YB/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 ADS7864YB/250?
For technical support, including ADS7864YB/250 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7864YB/250 requirements.
6.How does Aetrix verify that ADS7864YB/250 is sourced from the original manufacturer or authorized distributors?
All ADS7864YB/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 ADS7864YB/250 meets industry standards.
7.What is the process for return or replacement of ADS7864YB/250?
All ADS7864YB/250 units undergo pre-shipment inspection (PSI). If there is an issue with ADS7864YB/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 ADS7864YB/250 part is unused and in its original packaging.
Return procedure for ADS7864YB/250:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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