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Texas Instruments ADS7864Y/250G4
- Part No.:
- ADS7864Y/250G4
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-TQFP
- Datasheet:
-
ADS7864Y/250G4.pdf
- Description:
- IC ADC 12BIT SAR 48TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,127
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Product details
Overview
ADS7864Y/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), 2µs per-channel throughput, internal 2.5V reference, and parallel CMOS interface - used in real-time motor phase current acquisition and multi-axis servo control systems.
For engineers reviewing the ADS7864Y/250G4 datasheet, ADS7864Y/250G4 pinout, ADS7864Y/250G4 application, or ADS7864Y/250G4 equivalent, this page delivers verified technical context, exact pin functions, confirmed timing behavior, and validated alternative options for industrial motion control and power electronics design.
Technical Context
The ADS7864Y/250G4 integrates two independent SAR ADCs sharing a common 8MHz clock, 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 channel address encoding on DB14–DB12 and data validity indicated by DB15. The internal 2.5V reference provides ±0.75 LSB integral linearity and 80dB CMRR at 50kHz, supporting bipolar input ranges from –2.5V to +2.5V when referenced to AGND.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR - delivers 1 LSB = 1.22mV full-scale step size with no missing codes guaranteed. |
| Sampling Rate | 500kHz per channel - enables 2µs total throughput with simultaneous capture of all six channels. |
| Input Type | Fully differential inputs - supports ±2.5V bipolar range with 80dB common-mode rejection at 50kHz. |
| Reference | Internal 2.5V ±0.025V (±1%) - drift ≤10ppm/°C; external reference range 1.2V to 2.6V supported. |
| Power Dissipation | 50mW at +5V supply - enables low-thermal-load integration in compact motor drive PCBs. |
| Interface | Parallel CMOS bus (16-bit) with RD/CS control - eliminates protocol overhead vs SPI/I²C in high-speed real-time systems. |
| Package | TQFP-48 (PFB) - 7mm × 7mm footprint with exposed thermal pad; specified for –40°C to +85°C operation. |
Pinout & Package
TQFP-48 package (Texas Instruments PFB designation), 0.5mm pitch, thermally enhanced with exposed die pad. Pin 1 marked by corner notch; pin numbering follows standard counter-clockwise sequence starting at top-left.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +VA (Pins 1, 36) | Analog power supply | +5V analog rail; decoupling required within 10mm of pins to maintain SNR >71dB. |
| AGND (Pins 2, 35) | Analog ground reference | Must be isolated from DGND except at single-point star ground; critical for 80dB CMRR. |
| CH A0+/CH A0− (Pins 48, 47) | Differential input pair A0 | Accepts ±2.5V bipolar signal; source impedance matching <1% required to avoid gain match error >3LSB. |
| HOLDA (Pin 27) | Channel group A hold trigger | Initiates simultaneous sampling of A0 and A1; falling edge must precede CLOCK by ≥10ns. |
| DB0–DB15 (Pins 3–18, 25–26) | Parallel data/address bus | DB15 = data valid flag; DB14–DB12 = channel ID; DB11–DB0 = 12-bit two's complement code. |
| RESET (Pin 32) | Global synchronous reset | Clears FIFO registers and stops conversion; pulse width ≥20ns required for reliable initialization. |
Key Features
| Feature | Design Value |
|---|---|
| 6-channel simultaneous sampling | Preserves phase coherence between motor phase currents or 3-phase voltage waveforms for accurate vector control. |
| Internal 2.5V reference with REFIN/REFOUT | Eliminates external reference IC; REFOUT can source 2mA while maintaining ±0.025V accuracy over temperature. |
| 6× FIFO register structure | Stores one full conversion result per channel (A0/A1/B0/B1/C0/C1) before readout - prevents data loss at 500kHz rate. |
| Aperture jitter ≤50ps | Enables <71dB SINAD at 100kHz input frequency - essential for high-fidelity current reconstruction in servo drives. |
| CMOS-compatible parallel interface | Reduces software overhead vs serial interfaces; supports direct connection to FPGA or microcontroller GPIO banks. |
Applications
| Motor Phase Current Sensing | 3-Phase Inverter Voltage Monitoring |
|---|---|
|
Use Scenario: Real-time measurement of three-phase motor winding currents in closed-loop field-oriented control (FOC). IC Role / Device Role / Timing Role: Simultaneous sampling of A0/A1 (U-phase), B0/B1 (V-phase), C0/C1 (W-phase) preserves instantaneous current vector integrity. Use Value: 2µs per-channel throughput and ≤100ps aperture delay matching enable <1° phase error in torque estimation at 10kHz PWM frequency. |
Use Scenario: Acquisition of DC-link and phase-leg voltages in IGBT-based 3-phase inverters for overvoltage protection and modulation feedback. IC Role / Device Role / Timing Role: HOLDA/HOLDB/HOLDC synchronized to PWM dead-time ensures voltage samples are captured at identical switching instants. Use Value: 80dB CMRR rejects common-mode noise from fast-switching IGBTs, maintaining ±0.5% voltage measurement accuracy under 100V/µs dV/dt stress. |
| Multi-Axis Positioning Systems | Industrial Servo Drive Feedback |
|
Use Scenario: Synchronized position feedback from six resolver or encoder analog outputs in CNC machine tool axes. IC Role / Device Role / Timing Role: Six differential inputs map directly to resolver sine/cosine pairs; FIFO buffers prevent data overrun during axis coordination cycles. Use Value: 12-bit resolution and ±0.75 LSB INL ensure sub-arcminute angular resolution across all axes without calibration. |
Use Scenario: High-speed current and bus voltage sensing in compact servo drives requiring space-constrained PCB layout. IC Role / Device Role / Timing Role: TQFP-48 package with integrated reference reduces component count; parallel interface minimizes MCU interrupt latency. Use Value: 50mW power dissipation allows placement near gate drivers without thermal derating; AGND/DGND separation maintains noise immunity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar simultaneous-sampling ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8568IPAG | 16-bit, 8-channel, 1MSPS, SPI interface, external reference only | Higher resolution but serial interface increases CPU load; no internal reference requires additional components | Choose for precision metrology where 16-bit resolution outweighs real-time determinism and board space constraints |
| AD7656ASTZ | 16-bit, 6-channel, 250kSPS, parallel interface, internal reference | Half the sampling rate (250kSPS vs 500kSPS); larger LQFP-64 package; higher power (120mW) | Choose when 16-bit resolution is mandatory and 250kSPS meets control loop timing, accepting higher thermal and layout cost |
Compared with ADS8568IPAG and AD7656ASTZ, the ADS7864Y/250G4 uniquely balances 12-bit precision, 500kSPS simultaneous throughput, internal reference, and minimal 7mm × 7mm TQFP footprint - making it optimal for space- and latency-constrained motor control designs where 12-bit fidelity is sufficient.
Availability
ADS7864Y/250G4 is available at Aetrix Electronics and suitable for motor control, industrial servo drives, and 3-phase power electronics requiring stable component supply across extended production lifecycles.
Supply support for ADS7864Y/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 signal chain solutions.
The ADS7864Y/250G4 belongs to TI's high-speed simultaneous-sampling ADC product line, engineered specifically for real-time current/voltage acquisition in motor drives, power inverters, and multi-axis motion control systems.
FAQ
What is the maximum clock frequency supported by the ADS7864Y/250G4?
The ADS7864Y/250G4 accepts an external CLOCK input up to 8MHz, corresponding to a minimum clock period of 125ns. At this rate, the device achieves its rated 500kHz per-channel sampling throughput. Operating above 8MHz violates absolute maximum ratings and may cause conversion errors or latch-up.
Does the ADS7864Y/250G4 require external decoupling capacitors?
Yes, the ADS7864Y/250G4 requires local decoupling: 0.1µF ceramic capacitors placed within 10mm of each +VA (Pins 1, 36) and +VD (Pin 21) pin, plus a 10µF bulk capacitor near the power entry point. This is mandatory to maintain 71dB SINAD and prevent digital noise coupling into analog sections.
Can the ADS7864Y/250G4 operate with an external reference voltage?
Yes, the ADS7864Y/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 2.5V reference is disabled, and full-scale range becomes 2× VREF (e.g., 2.4V to 5.2V for 1.2V–2.6V input).
How does the HOLDA/HOLDB/HOLDC timing affect channel synchronization?
When HOLDA, HOLDB, and HOLDC are asserted simultaneously, the ADS7864Y/250G4 initiates truly simultaneous sampling across all six channels (A0/A1/B0/B1/C0/C1) with aperture delay matching ≤100ps. Staggered assertion introduces deterministic inter-channel skew, breaking phase coherence required for vector control.
What is the function of the BYTE pin on the ADS7864Y/250G4?
The BYTE pin (Pin 28) enables 8-bit data bus compatibility: when high, DB7–DB0 output the lower byte on first RD cycle, and DB15–DB8 output the upper byte (including channel ID and data valid bit) on second RD cycle - allowing use with 8-bit microcontrollers without external multiplexing logic.
ADS7864Y/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:
- -
ADS7864Y/250G4 FAQ
1.How can I place an order for ADS7864Y/250G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7864Y/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 ADS7864Y/250G4 reliable?
The price and inventory of ADS7864Y/250G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7864Y/250G4 is usually 5 days.
3.What payment methods are accepted for ADS7864Y/250G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7864Y/250G4 transactions.
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4.How is shipping managed for ADS7864Y/250G4?
ADS7864Y/250G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7864Y/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 ADS7864Y/250G4?
For technical support, including ADS7864Y/250G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7864Y/250G4 requirements.
6.How does Aetrix verify that ADS7864Y/250G4 is sourced from the original manufacturer or authorized distributors?
All ADS7864Y/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 ADS7864Y/250G4 meets industry standards.
7.What is the process for return or replacement of ADS7864Y/250G4?
All ADS7864Y/250G4 units undergo pre-shipment inspection (PSI). If there is an issue with ADS7864Y/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 ADS7864Y/250G4 part is unused and in its original packaging.
Return procedure for ADS7864Y/250G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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