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Texas Instruments ADS7865IPBS
- Part No.:
- ADS7865IPBS
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 32-TQFP
- Datasheet:
-
ADS7865IPBS.pdf
- Description:
- IC ADC 12BIT SAR 32TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:242
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Product details
Overview
ADS7865IPBS from Texas Instruments is a dual, 12-bit, 2MSPS simultaneous-sampling analog-to-digital converter with four fully differential or six pseudo-differential input channels, internal 2.5V reference with 10-bit DAC programmability, parallel CMOS interface, and operation from –40°C to +125°C in TQFP-32. It delivers 71.7dB SNR and –87dB THD for high-fidelity motor control feedback acquisition.
For engineers reviewing the ADS7865IPBS datasheet, ADS7865IPBS pinout, ADS7865IPBS application, or ADS7865IPBS equivalent, this page provides verified technical context, real-world timing and accuracy specifications, validated pin functions, confirmed alternative parts with documented functional differences, and supply-chain support details for industrial embedded design.
Technical Context
The ADS7865IPBS implements two independent SAR ADCs with fully differential sample-and-hold front-ends, each fed by a configurable 2:1 multiplexer supporting either fully differential (CHx0+/CHx0– or CHx1+/CHx1–) or pseudo-differential (CHx0+, CHx1+, CHx1– referenced to CHx0–) input modes. Conversion is triggered by CONVST falling edge and synchronized to external CLOCK (1–32MHz), with fixed 13-clock conversion time and 62.5ns acquisition window.
Its internal 2.5V reference includes a buffered 10-bit DAC (2.44mV/LSB step) accessible via parallel write, enabling precise output voltage adjustment from 0.5V to 2.515V. The device features three power-down modes-Auto-Nap, Nap, and Deep-with analog supply current dropping to 1μA in deep mode-and maintains 72dB CMRR up to 100kHz for noise-immune signal capture in harsh environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR architecture ensures ±0.5 LSB DNL and ±1 LSB INL over –40°C to +85°C for precision closed-loop control. |
| Sampling Rate | 2MSPS maximum data rate enables simultaneous sampling of dual-axis position or three-phase voltage/current at 100kHz fundamental frequency. |
| SNR / THD | 71.7dB SNR and –87dB THD at 100kHz input allow accurate spectral analysis of motor harmonics and power quality metrics. |
| Reference Output | Programmable 10-bit DAC (2.44mV/step) on REFOUT supports calibrated sensor offset correction without external components. |
| CMRR | 72dB common-mode rejection up to 100kHz suppresses ground-bounce and EMI in multi-channel industrial I/O modules. |
| Supply Range | AVDD = 2.7V–5.5V and BVDD = 2.7V–5.5V enable flexible partitioning between analog and digital domains in mixed-voltage systems. |
| Operating Temp | –40°C to +125°C rating qualifies ADS7865IPBS for under-hood automotive sensors and industrial drive control boards. |
Pinout & Package
Packaged in TQFP-32 (PBS), ADS7865IPBS separates analog (AGND/AVDD) and digital (BGND/BVDD) grounds and supplies to minimize coupling noise. Pin layout supports compact PCB routing with adjacent DB[11:0] data bus and dedicated CONVST/CLOCK/WR/RD control lines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REFIN | Reference voltage input | Direct connection to internal ADC reference node; requires ≥470nF ceramic capacitor to AGND for stability during switching transients. |
| REFOUT | Programmable reference output | Buffered 2.5V DAC output; adjustable from 0.5V to 2.515V in 2.44mV steps for sensor calibration or gain scaling. |
| CHA0+ / CHA0– CHA1+ / CHA1– CHB0+ / CHB0– CHB1+ / CHB1– | Differential analog inputs | Eight pins forming four fully differential pairs; support simultaneous sampling of two independent 2-channel sensor sets (e.g., phase A/B voltage + current). |
| DB[11:0] | Parallel data bus | 12-bit bidirectional CMOS bus delivering conversion results MSB-first; compatible with 5V-tolerant microcontrollers when BVDD = 5V. |
| CONVST | Conversion start trigger | Falling-edge–sensitive command initiating simultaneous hold on both ADCs; timing-critical for synchronized multi-axis acquisition. |
| CLOCK | System clock input | External 1–32MHz CMOS clock driving conversion timing; 13-cycle fixed latency enables deterministic jitter-free sampling. |
| BUSY | Conversion status indicator | Active-high open-drain signal indicating hold mode active and conversion in progress; used for handshaking with FPGA or MCU. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous dual ADC sampling | Enables true time-aligned capture of two independent analog signals (e.g., motor phase voltage and current) without inter-channel skew. |
| Configurable input multiplexer | Each ADC supports either 2 fully differential inputs or 3 pseudo-differential inputs sharing one common-mode node-reducing external component count in multi-sensor systems. |
| Internal 10-bit programmable reference | Eliminates need for external DAC or trim potentiometer; allows dynamic reference adjustment during runtime for auto-calibration sequences. |
| Three-tier power-down modes | Deep power-down (1μA), Nap (1.6mA), and Auto-Nap (adaptive) reduce system-level power consumption in battery-powered or thermally constrained applications. |
| High CMRR at 100kHz | 72dB rejection enables reliable operation in electrically noisy environments such as VFD cabinets or robotic joints with PWM switching noise. |
Applications
| Motor Control Feedback | Multi-Axis Positioning Systems |
|---|---|
Use Scenario: Real-time acquisition of dual-phase current and voltage in servo drives for field-oriented control (FOC). IC Role / Device Role / Timing Role: Dual simultaneous-sampling ADC captures phase A/B current and DC bus voltage within <50ps channel match tolerance to preserve vector integrity. Use Value: Enables accurate torque estimation and ripple suppression at 20kHz PWM frequencies without inter-channel phase error. | Use Scenario: Coordinated position sensing across X/Y/Z axes in CNC machines using resolver or encoder analog outputs. IC Role / Device Role / Timing Role: Simultaneous sampling of three independent analog position signals with matched aperture delay (<50ps) ensures spatial coherence. Use Value: Eliminates interpolation artifacts in high-speed contouring paths, improving machining accuracy by >0.005mm. |
| Three-Phase Power Monitoring | Industrial PLC Analog Input Modules |
Use Scenario: Voltage and current measurement across all three phases in energy meters or power quality analyzers. IC Role / Device Role / Timing Role: Two ADCs acquire line-to-line voltages (Vab/Vbc) and corresponding currents (Ia/Ib) simultaneously at 2MSPS for full-cycle RMS and harmonic calculation. Use Value: Supports IEC 61000-4-30 Class A compliance with 50th harmonic analysis at 50/60Hz fundamentals. | Use Scenario: High-density analog input card in modular PLC backplanes requiring 16+ channels per module with isolated signal conditioning. IC Role / Device Role / Timing Role: ADS7865IPBS serves as local ADC engine per 4-channel group, interfacing via parallel bus to FPGA-based aggregator. Use Value: Reduces per-channel BOM cost by integrating reference, mux, and dual conversion-cutting component count by 30% vs discrete solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel, high-speed ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7862IPBS | 12-bit, 2MSPS dual ADC but lacks programmable reference DAC, channel sequencer, and Auto-Nap power-down; identical pinout and parallel interface. | Fixed 2.5V reference only; no runtime calibration capability; less suitable for adaptive sensor systems requiring offset drift compensation. | Select ADS7862IPBS only if reference programmability and advanced power management are unnecessary and legacy compatibility is required. |
| AD7327BRUZ | 12-bit, 1MSPS dual ADC with software-configurable input ranges (±10V, ±5V, ±2.5V, 0–10V); uses SPI interface instead of parallel; operates from –40°C to +85°C. | No simultaneous sampling-uses interleaved conversion; lower throughput limits real-time FOC loop bandwidth; SPI adds MCU overhead vs parallel bus. | Choose AD7327BRUZ when multi-range flexibility and smaller footprint outweigh need for simultaneous sampling and extended temperature range. |
Compared with ADS7865IPBS, ADS7862IPBS offers identical timing and pin compatibility but omits programmable reference and power-down features, while AD7327BRUZ trades parallel interface and simultaneous sampling for software-configurable ranges and SPI simplicity-making ADS7865IPBS optimal for deterministic, high-throughput industrial control where channel synchronization and runtime calibration are critical.
Availability
ADS7865IPBS is available at Aetrix Electronics and suitable for motor control feedback, multi-axis positioning systems, and three-phase power monitoring requiring stable component supply across extended temperature and long production lifecycles.
Supply support for ADS7865IPBS 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 IC design.
The ADS7865IPBS belongs to TI's high-performance SAR ADC product line, engineered specifically for deterministic, simultaneous-sampling applications in motor drives, power inverters, and automated test equipment demanding sub-50ps channel matching and extended temperature reliability.
FAQ
What is the maximum sampling rate of the ADS7865IPBS and how is it achieved?
The ADS7865IPBS achieves a maximum sampling rate of 2MSPS through external CLOCK frequencies up to 32MHz, with a fixed 13-clock conversion cycle plus acquisition time. Each ADC completes conversion in 406.25ns at 32MHz, and BUSY signal timing confirms completion before next CONVST assertion. This rate is sustained across the full –40°C to +125°C range with guaranteed SNR and THD performance.
Does the ADS7865IPBS support true simultaneous sampling across both ADCs?
Yes, the ADS7865IPBS supports true simultaneous sampling: a single CONVST falling edge initiates hold mode on both ADCs at the same instant, and conversion proceeds in parallel with matched aperture delay (≤50ps). This preserves phase relationships between dual-channel measurements essential for vector control and power analysis.
How does the programmable reference output (REFOUT) function in the ADS7865IPBS?
The ADS7865IPBS REFOUT pin delivers a buffered 2.5V reference adjusted via an internal 10-bit DAC (2.44mV/LSB), controllable through parallel WR writes to the DAC register. Valid output range is 0.5V to 2.515V; DAC code 0x3FF yields 2.500V nominal, with ±10ppm/°C drift and 0.5ms settling time after change.
What power-down modes are available on the ADS7865IPBS and what are their current draws?
The ADS7865IPBS offers three power-down modes: Auto-Nap (1.1–1.8mA at 5V AVDD), Nap (0.9–1.6mA), and Deep Power-Down (1μA). These are controlled via DP/N/AN bits in the configuration register. Deep mode disables reference, clock receiver, and analog circuitry-ideal for standby in battery-operated condition monitoring nodes.
Is the ADS7865IPBS pin-compatible with any other Texas Instruments ADCs?
Yes, the ADS7865IPBS is pin-compatible with the ADS7862IPBS, sharing identical TQFP-32 footprint and parallel interface signals (DB[11:0], CONVST, CLOCK, RD, WR, CS, BUSY). However, ADS7865IPBS replaces the ADS7862's A0 channel select pin with WR functionality and adds REFOUT/REFIN pins for programmable reference support.
ADS7865IPBS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 32-TQFP
- Packaging:
- Tray
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 2M
- Number of Inputs:
- 4, 6
- Input Type:
- Differential, Pseudo-Differential
- Data Interface:
- Parallel
- 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:
- 2.7V ~ 5.5V
- Voltage - Supply, Digital:
- 2.7V ~ 5.5V
- Features:
- Simultaneous Sampling
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 32-TQFP (5x5)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS7865IPBS FAQ
1.How can I place an order for ADS7865IPBS through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7865IPBS 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 ADS7865IPBS reliable?
The price and inventory of ADS7865IPBS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7865IPBS is usually 5 days.
3.What payment methods are accepted for ADS7865IPBS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7865IPBS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7865IPBS?
ADS7865IPBS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7865IPBS 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 ADS7865IPBS?
For technical support, including ADS7865IPBS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7865IPBS requirements.
6.How does Aetrix verify that ADS7865IPBS is sourced from the original manufacturer or authorized distributors?
All ADS7865IPBS 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 ADS7865IPBS meets industry standards.
7.What is the process for return or replacement of ADS7865IPBS?
All ADS7865IPBS units undergo pre-shipment inspection (PSI). If there is an issue with ADS7865IPBS, 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 ADS7865IPBS part is unused and in its original packaging.
Return procedure for ADS7865IPBS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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