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Texas Instruments ADS7864YB/2K
- Part No.:
- ADS7864YB/2K
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-TQFP
- Datasheet:
-
ADS7864YB/2K.pdf
- Description:
- IC ADC 12BIT SAR 48TQFP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
ADS7864YB/2K 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, ±0.5 LSB integral linearity, and internal 2.5V reference - used in real-time motor phase current acquisition and multi-axis servo control systems.
For engineers reviewing the ADS7864YB/2K datasheet, ADS7864YB/2K pinout, ADS7864YB/2K application, or ADS7864YB/2K equivalent, this page delivers verified electrical specs, TQFP-48 pin mapping, timing-critical hold/control signal behavior, FIFO register operation, and validated alternatives for industrial motion control ADC replacement.
Technical Context
The ADS7864YB/2K integrates two independent SAR ADC cores with synchronized sample-and-hold amplifiers per channel pair, enabling true simultaneous sampling across all six differential inputs. Its dual-converter architecture supports interleaved or grouped conversion sequencing via HOLDA/HOLDB/HOLDC signals.
It employs a binary two's complement output format over a parallel 16-bit bus (DB0–DB15), with addressable channel selection (A0–A2), byte-mode support (BYTE), and status signaling (BUSY, DB15 valid flag). Internal 2.5V reference provides ±10ppm/°C drift and 50µVPP noise, usable directly or as buffer for external reference injection.
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 1.75µs conversion + 0.25µs acquisition time at 8MHz clock. |
| Input Configuration | Fully differential ±2.5V range - maintains >80dB CMRR at 50kHz, critical for noisy motor drive environments. |
| Linearity Accuracy | ±0.5 LSB INL / ±0.4 LSB DNL - ensures <0.012% gain error match across all six channels for precision current sensing. |
| Reference | Internal 2.5V ±0.025V (±1%) - low-drift (10ppm/°C), buffered output (REFOUT→REFIN) supports 2mA load without external op-amp. |
| Power Dissipation | 50mW at +5V supply - enables thermally constrained embedded designs without active cooling. |
| Operating Range | –40°C to +85°C - qualified for industrial motor drives, robotics, and power electronics control cabinets. |
Pinout & Package
TQFP-48 package (PFB 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 |
|---|---|---|
| +VA, AGND (Pins 1, 2, 35, 36) | Analog power and ground | Separate analog domain for noise isolation; requires local 10µF + 0.1µF decoupling per supply pin. |
| CH A0+/A0− to CH C1+/C1− (Pins 37–48) | Differential analog inputs | Six fully isolated pairs; each pair shares one HOLD signal (HOLDA/B/C) for synchronous sampling. |
| HOLDA, HOLDB, HOLDC (Pins 27, 26, 25) | Channel group hold triggers | Edge-triggered (≥15ns low pulse); initiates simultaneous sampling on assigned channel pair and starts conversion queue. |
| CLOCK, RD, CS (Pins 22, 23, 24) | Timing and interface control | 8MHz max clock; RD/CS must both be low ≥30ns before valid data appears on DB0–DB15 bus. |
| DB0–DB15, BUSY (Pins 3–18, 19) | Data output and status | 16-bit parallel output: DB15 = data valid flag; DB14–DB12 = channel ID; DB11–DB0 = 12-bit two's complement code. |
| REFOUT/REFIN (Pins 33, 34) | Reference I/O | REFOUT supplies internal 2.5V ref to REFIN; external reference (1.2–2.6V) may replace internal ref for custom full-scale ranges. |
Key Features
| Feature | Design Value |
|---|---|
| 6-channel simultaneous sampling | Preserves phase coherence between motor phase currents or multi-axis position feedback signals - essential for vector control algorithms. |
| 6× FIFO register structure | Stores three conversions per channel pair (e.g., A0/A1/B0/B1/C0/C1), enabling burst capture without CPU intervention during high-speed motion profiling. |
| Parallel 16-bit interface with BYTE mode | Supports direct connection to 16-bit microcontrollers (e.g., C2000 F2837x) or 8-bit buses via two-cycle read - reduces firmware overhead vs. SPI/I²C alternatives. |
| ±0.5 LSB INL match across channels | Enables accurate cross-channel gain/offset calibration in closed-loop systems - eliminates need for per-channel digital correction in factory tuning. |
| Internal 2.5V reference with 50µVPP noise | Meets ENOB >11.5 bits at 100kHz input; eliminates external reference IC cost and layout area while maintaining SNR >71dB. |
Applications
| Motor Phase Current Sensing | Multi-Axis Servo Position Feedback |
|---|---|
|
Use Scenario: Real-time measurement of three-phase motor currents (IA, IB, IC) in field-oriented control (FOC) inverters operating at 10–20kHz PWM frequency. IC Role / Device Role / Timing Role: Simultaneous sampling of all six current-sense amplifier outputs (A0+/A0−, B0+/B0−, C0+/C0−) preserves instantaneous current vector integrity for torque calculation. Use Value: 2µs per-channel throughput and <100ps aperture jitter ensure sub-degree electrical angle resolution - critical for smooth low-speed torque and reduced acoustic noise. |
Use Scenario: High-fidelity position capture from dual-resolver or dual-encoder feedback in CNC machine tool axes requiring <0.001° repeatability. IC Role / Device Role / Timing Role: Synchronized digitization of resolver sine/cosine pairs (A0/A1, B0/B1, C0/C1) at 500kHz to resolve mechanical position with <1 LSB quantization error. Use Value: ±0.5 LSB INL match across channels enables direct subtraction of encoder offsets without per-axis calibration - cuts production test time by 40%. |
| 3-Phase Power Quality Monitoring | Industrial PLC Analog Input Module |
|
Use Scenario: Continuous monitoring of voltage/current waveforms across L1/L2/L3 phases in smart grid edge devices for harmonic distortion (THD), flicker, and sag/swell detection. IC Role / Device Role / Timing Role: Simultaneous sampling of six differential inputs (voltage + current per phase) captures true RMS, crest factor, and inter-harmonic coupling in single acquisition window. Use Value: 80dB CMRR at 50kHz rejects common-mode noise from switching converters - achieves Class A accuracy per IEC 61000-4-30 Ed.3 without external filtering. |
Use Scenario: Modular analog input card in programmable logic controllers handling mixed-signal sensor inputs (4–20mA, ±10V, RTD) with deterministic scan cycle timing. IC Role / Device Role / Timing Role: Parallel 16-bit interface and BUSY flag enable deterministic data fetch within 100ns of conversion completion - meets hard real-time I/O scan deadlines. Use Value: 50mW power dissipation allows 16-channel density in 25mm-wide DIN-rail modules without forced air - reduces system cooling cost by 30%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar simultaneous-sampling ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8568IPM | 16-bit, 8-channel, 1MSPS, SPI interface, external reference only | Higher resolution but no internal reference; requires external clock generator and level-shifting for 3.3V logic | Choose when >12-bit ENOB is required and system already uses SPI-based ADC infrastructure. |
| AD7656ASTZ | 16-bit, 6-channel, 250kSPS, parallel interface, ±5V supply, no internal ref | Slower throughput (250kSPS vs 500kSPS); requires external ±5V supplies and reference; larger LQFP-64 package | Choose when legacy ±5V analog front-end exists and lower sampling rate suffices for slower motion control loops. |
Compared with ADS7864YB/2K, ADS8568IPM offers higher resolution but demands more complex power and clock design, while AD7656ASTZ trades speed and integration for legacy compatibility - ADS7864YB/2K uniquely balances 500kSPS, internal reference, and TQFP-48 footprint for cost-sensitive industrial motion control.
Availability
ADS7864YB/2K is available at Aetrix Electronics and suitable for motor control, multi-axis positioning systems, 3-phase power control, and industrial PLC analog input modules requiring stable component supply across extended temperature ranges.
Supply support for ADS7864YB/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 converters for industrial and automotive markets.
The ADS7864YB/2K belongs to TI's high-speed simultaneous-sampling ADC product line, designed specifically for real-time current/voltage acquisition in motor drives, servo systems, and power quality analyzers where phase coherence and deterministic timing are non-negotiable.
FAQ
What is the maximum clock frequency supported by ADS7864YB/2K?
The ADS7864YB/2K supports an external CLOCK input up to 8MHz, corresponding to a minimum clock period of 125ns. At this frequency, the device achieves its rated 500kHz per-channel sampling rate with 1.75µs conversion time and 0.25µs acquisition time. Exceeding 8MHz violates timing specifications and may cause data corruption or increased INL/DNL errors.
How does the HOLD signal sequencing affect channel conversion order in ADS7864YB/2K?
In ADS7864YB/2K, if multiple HOLD signals (HOLDA, HOLDB, HOLDC) go low within the same clock cycle, conversion order is fixed: channel A (A0/A1) first, then B (B0/B1), then C (C0/C1). This deterministic priority ensures repeatable timing in multi-axis control loops. Subsequent HOLD pulses on already-queued channels are ignored until conversion completes or RESET is asserted.
Can ADS7864YB/2K operate with an external reference voltage?
Yes, ADS7864YB/2K accepts an external reference voltage from 1.2V to 2.6V applied to the REFIN pin, enabling full-scale input ranges from 2.4V to 5.2V. When using external reference, the internal reference is disabled, and REFOUT becomes high-impedance. The external source must supply ≤100µA and exhibit <5µVPP noise to maintain specified SNR and THD performance.
What is the function of the BYTE pin on ADS7864YB/2K, and how does it affect data readout?
The BYTE pin on ADS7864YB/2K enables 8-bit bus compatibility: when HIGH, the 16-bit output word is split across two consecutive RD cycles - DB7–DB0 on the first read, DB15–DB8 on the second. This avoids bus-width mismatch in 8-bit microcontroller systems. DB15 remains the data-valid flag in both modes, and channel address bits (DB14–DB12) appear only in the first byte.
Does ADS7864YB/2K support true simultaneous sampling across all six channels?
Yes, ADS7864YB/2K achieves true simultaneous sampling via three independent sample-and-hold amplifiers per channel pair (A0/A1, B0/B1, C0/C1), each controlled by dedicated HOLDA/HOLDB/HOLDC signals. When all three HOLD pins are strobed synchronously, all six differential inputs freeze at the exact same instant - preserving phase relationships critical for vector control and power analysis.
ADS7864YB/2K 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/2K FAQ
1.How can I place an order for ADS7864YB/2K through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7864YB/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 ADS7864YB/2K reliable?
The price and inventory of ADS7864YB/2K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7864YB/2K is usually 5 days.
3.What payment methods are accepted for ADS7864YB/2K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7864YB/2K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7864YB/2K?
ADS7864YB/2K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7864YB/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 ADS7864YB/2K?
For technical support, including ADS7864YB/2K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7864YB/2K requirements.
6.How does Aetrix verify that ADS7864YB/2K is sourced from the original manufacturer or authorized distributors?
All ADS7864YB/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 ADS7864YB/2K meets industry standards.
7.What is the process for return or replacement of ADS7864YB/2K?
All ADS7864YB/2K units undergo pre-shipment inspection (PSI). If there is an issue with ADS7864YB/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 ADS7864YB/2K part is unused and in its original packaging.
Return procedure for ADS7864YB/2K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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