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Texas Instruments ADS8557IPMR
- Part No.:
- ADS8557IPMR
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 64-LQFP
- Datasheet:
-
ADS8557IPMR.pdf
- Description:
- IC ADC 14BIT SAR 64LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,516
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Product details
Overview
ADS8557IPMR from Texas Instruments is a 14-bit, six-channel simultaneous-sampling SAR ADC with true bipolar inputs, internal programmable reference (0.5–3.0 V), parallel/serial interface selectability, and 670 kSPS maximum data rate in parallel mode. It supports ±12-V input ranges via hardware or software configuration and operates across –40°C to 125°C for industrial power quality and protection relay systems.
For engineers reviewing the ADS8557IPMR datasheet, ADS8557IPMR pinout, ADS8557IPMR application, or ADS8557IPMR equivalent, key selection considerations include simultaneous sampling of three analog channel pairs (A/B/C), configurable input voltage range (±2×VREF or ±4×VREF), internal reference tuning resolution (10-bit DAC), deep power-down mode (≤50 µA), and LQFP-64 package compatibility with ADS8556/ADS8558.
Technical Context
The ADS8557IPMR integrates six independent SAR ADCs grouped into three synchronized pairs (A0/A1, B0/B1, C0/C1), each with dedicated sample-and-hold enabling true simultaneous acquisition. Its control logic supports both hardware pin-strapping (HW/SW = 0) and register-based configuration (HW/SW = 1), including RANGE/XCLK dual-function pin and REFEN/WR mode-dependent behavior.
It features a programmable internal reference DAC (10-bit, 0.5–3.0 V output), three decoupled reference capacitor pins (REFC_A/B/C), and flexible digital interface modes: 16-bit parallel (WORD/BYTE selectable) or daisy-chainable serial (SCLK up to 36 MHz). Power domains are segregated: AVDD (4.5–5.5 V), BVDD (2.7–5.5 V), HVDD/HVSS (±5–16.5 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit SAR architecture providing 16,384 discrete output codes per channel. |
| Sampling Rate | 670 kSPS max in parallel mode with internal clock; enables real-time capture of fast transients in protection relays. |
| Input Range | Selectable ±2×VREF or ±4×VREF (up to ±12 V); supports direct connection to CT/PT outputs without external scaling. |
| Reference | Internal 10-bit DAC-tuned reference (0.5–3.0 V); eliminates need for external precision reference ICs in most applications. |
| SNR | 85 dB typical at 25°C; ensures accurate amplitude measurement of fundamental and harmonic components in power analyzers. |
| Aperture Jitter | 50 ps typical; critical for maintaining phase coherence across all six channels during simultaneous sampling. |
| Operating Temp | –40°C to 125°C ambient; qualified for under-hood automotive and high-temperature industrial environments. |
| Package | LQFP-64 (10 mm × 10 mm); compatible with standard SMT reflow and allows routing separation between analog/digital/power domains. |
Pinout & Package
LQFP-64 package with exposed thermal pad; requires dedicated analog (AGND) and digital (BGND) ground planes, plus separate HVDD/HVSS supplies for ±12-V input stage biasing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CONVST_A/B/C | Hardware conversion trigger inputs | Simultaneous rising-edge initiation of A0/A1, B0/B1, C0/C1 channel pairs; mandatory high hold time prevents partial power-down. |
| CH_A0–CH_C1 (12 pins) | Analog input terminals | True bipolar inputs accepting ±2×VREF or ±4×VREF ranges; each pair shares common-mode rejection via matched internal design. |
| REFIO / REFC_A/B/C | Reference voltage I/O and decoupling | REFIO accepts external reference or outputs internal DAC-adjusted VREF; REFC_x pins require 10-μF ceramic caps for stable per-pair reference buffering. |
| PAR/SER, HW/SW, WORD/BYTE | Interface configuration controls | Three-pin hardware strapping sets parallel/serial mode, pin vs register control, and 16-bit word vs 8-bit byte data transfer sequence. |
| DB[15:0], RD, CS/FS, BUSY/INT | Digital I/O for parallel interface | 16-bit bidirectional data bus with chip-select/frame-sync and status-interrupt output; supports burst reads and interrupt-driven firmware handling. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous six-channel sampling | Three independent SAR pairs (A/B/C) acquire 12 analog signals synchronously-essential for vector measurements in 3-phase power systems. |
| Programmable internal reference DAC | 10-bit resolution adjusts VREF from 0.5 V to 3.0 V in 1-mV steps, enabling precise gain calibration without external components. |
| Configurable power-down modes | Deep standby (≤50 µA), auto-nap (6 µA idle), and partial shutdown allow dynamic current scaling based on real-time sampling demand. |
| Bipolar input with ±12-V range | Direct interface to isolation amplifiers or current/voltage transformers; eliminates level-shifting circuitry and associated error sources. |
| Parallel or serial interface selectability | Hardware-selectable PAR/SER mode supports legacy microcontroller buses or space-constrained FPGA designs with daisy-chained SDO outputs. |
Applications
| Power Quality Monitoring | Protection Relay Systems |
|---|---|
|
Use Scenario: Real-time measurement of voltage/current harmonics, flicker, and sag/swell events in medium-voltage distribution networks. IC Role / Device Role / Timing Role: Simultaneous sampling of six analog inputs (3-phase V/I) with <250-ps aperture matching ensures coherent phasor calculation. Use Value: Enables IEC 61000-4-30 Class A compliance by meeting strict inter-channel timing skew and SNR requirements. |
Use Scenario: Fault detection and tripping logic in feeder protection relays requiring sub-cycle response to overcurrent, earth fault, or differential anomalies. IC Role / Device Role / Timing Role: Six-channel SAR ADC captures pre-fault and post-fault waveforms with deterministic latency (<1.5 µs conversion + interface delay). Use Value: Supports ANSI C37.112-2018 event recording with ≥64 samples/cycle at 60 Hz, preserving waveform fidelity for root-cause analysis. |
| Multi-Axis Motor Drives | Industrial PLC Analog Input Modules |
|
Use Scenario: Closed-loop torque and flux control in servo drives with >3 axes, requiring synchronized current sensing across phases and windings. IC Role / Device Role / Timing Role: Three channel pairs (A/B/C) sample motor phase currents and back-EMF simultaneously to eliminate cross-axis coupling errors. Use Value: Enables field-oriented control (FOC) with <1° electrical angle error at 10-kHz PWM frequencies, improving efficiency and torque ripple. |
Use Scenario: High-density analog input expansion for programmable logic controllers handling mixed-signal sensor data (RTD, thermocouple, 4–20 mA) in process automation. IC Role / Device Role / Timing Role: ADC serves as front-end for modular I/O cards; parallel interface connects directly to ARM Cortex-M7 or RISC-V SoC data buses. Use Value: Reduces component count by integrating reference, buffering, and simultaneous sampling-cutting BOM cost by ~$2.30 per 6-channel module. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar simultaneous-sampling ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8556IPMR | 16-bit resolution, 630 kSPS max parallel rate, identical pinout and register map; lower SNR (91.5 dB vs 85 dB) but higher DC accuracy. | Better suited for high-precision DC-coupled measurements (e.g., calibration equipment) where resolution outweighs speed. | Select ADS8556IPMR when 16-bit linearity and offset drift dominate over sampling throughput. |
| ADS8558IPMR | 12-bit resolution, 730 kSPS max parallel rate, same package and interface; optimized for higher-speed transient capture with relaxed DC specs. | Ideal for vibration monitoring or fast-switching power converter analysis where bandwidth > resolution. | Choose ADS8558IPMR when system-level SNR is governed by sensor noise rather than ADC quantization. |
Compared with ADS8556IPMR and ADS8558IPMR, the ADS8557IPMR delivers optimal balance of speed (670 kSPS), resolution (14-bit), and SNR (85 dB) for mid-tier industrial data acquisition-making it the default choice when neither extreme precision nor maximum throughput is required.
Availability
ADS8557IPMR is available at Aetrix Electronics and suitable for power quality monitoring, protection relay systems, and multi-axis motor control requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADS8557IPMR 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 ADS855x family-including ADS8557IPMR-is designed specifically for high-reliability simultaneous-sampling applications in power infrastructure, factory automation, and energy metering systems demanding robust operation from –40°C to 125°C.
FAQ
What is the maximum sampling rate of the ADS8557IPMR in parallel interface mode?
The ADS8557IPMR achieves a maximum sampling rate of 670 kSPS per channel in parallel interface mode when using the internal conversion clock and reference. This rate supports real-time capture of 50/60-Hz power system waveforms with over 11,000 samples per cycle, enabling high-fidelity harmonic analysis and transient detection in protection relay applications.
Does the ADS8557IPMR support true simultaneous sampling across all six channels?
Yes, the ADS8557IPMR implements true simultaneous sampling using three independent SAR ADC pairs (A0/A1, B0/B1, C0/C1), each triggered by dedicated CONVST inputs. Aperture delay matching is specified at 250 ps, ensuring phase-coherent acquisition essential for vector calculations in 3-phase power systems and multi-axis motor control.
Can the ADS8557IPMR operate with an external reference voltage?
Yes, the ADS8557IPMR accepts external reference voltages from 0.5 V to 3.025 V at the REFIO pin. When REFEN/WR is low in hardware mode-or CR bit C25 is cleared in software mode-the internal reference is disabled and the device uses the externally applied voltage, allowing integration with ultra-low-drift references for metrology-grade systems.
What power supply rails does the ADS8557IPMR require?
The ADS8557IPMR requires four independent supply rails: AVDD (4.5–5.5 V) for analog core, BVDD (2.7–5.5 V) for digital I/O, and HVDD/HVSS (±5–16.5 V) for the bipolar analog input stage. Proper decoupling-100-nF ceramics at each AVDD/BVDD pin and 10-μF ceramics at HVDD/HVSS-is mandatory to maintain SNR and prevent cross-talk.
Is the ADS8557IPMR pin-compatible with other devices in the ADS855x family?
Yes, the ADS8557IPMR shares identical LQFP-64 pinout, register map, and interface timing with ADS8556IPMR and ADS8558IPMR. This pin-and-software compatibility allows hardware reuse across 12-/14-/16-bit variants, simplifying design scalability and inventory management for industrial OEMs developing multiple performance tiers.
ADS8557IPMR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 64-LQFP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 14
- Sampling Rate (Per Second):
- 670k
- Number of Inputs:
- 6
- Input Type:
- Single Ended
- Data Interface:
- SPI, Parallel
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 2.7V ~ 3.6V, 5V
- Features:
- Simultaneous Sampling
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 64-LQFP (10x10)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS8557IPMR FAQ
1.How can I place an order for ADS8557IPMR through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS8557IPMR 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 ADS8557IPMR reliable?
The price and inventory of ADS8557IPMR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS8557IPMR is usually 5 days.
3.What payment methods are accepted for ADS8557IPMR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS8557IPMR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS8557IPMR?
ADS8557IPMR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS8557IPMR 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 ADS8557IPMR?
For technical support, including ADS8557IPMR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS8557IPMR requirements.
6.How does Aetrix verify that ADS8557IPMR is sourced from the original manufacturer or authorized distributors?
All ADS8557IPMR 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 ADS8557IPMR meets industry standards.
7.What is the process for return or replacement of ADS8557IPMR?
All ADS8557IPMR units undergo pre-shipment inspection (PSI). If there is an issue with ADS8557IPMR, 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 ADS8557IPMR part is unused and in its original packaging.
Return procedure for ADS8557IPMR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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