ADS8568SPM - 16-Bit 8-Ch Simultaneous-Sampling SAR ADC | TI
MPN: ADS8568SPM ✓ فعالADS8568SPM نمای کلی
A SAR ADC (Successive Approximation Register analog-to-digital converter) is a precision data-conversion architecture that uses a binary-search algorithm against an internal DAC to produce a digital code in N conversion cycles for N bits of resolution. SAR ADCs are prized for deterministic latency, excellent DC accuracy, and low power consumption, sitting in the hierarchy alongside pipeline, sigma-delta, and flash converters as one of the four principal ADC architectures. Simultaneous-sampling variants like the ADS8568 capture all eight channels on the same internal clock edge, eliminating inter-channel skew that would otherwise corrupt polyphase measurements in power-line monitoring, motor control, and multi-axis data acquisition.
Key features include on-chip analog input clamp protection, a second-order anti-aliasing filter per channel, integrated track-and-hold amplifiers, flexible serial or parallel digital interfaces, and an auto-sleep mode that drops quiescent current between conversions. The bipolar input architecture eliminates external signal-conditioning circuitry for industrial ±10 V or ±5 V signals, simplifying board design and improving noise immunity in harsh environments. The integrated reference and reference-buffer reduce external component count, while a hardware reset pin and software reset word simplify multi-device synchronization.
The ADS8568 forms part of a pin-compatible family alongside the 12-bit ADS8528 and 14-bit ADS8548, allowing designers to migrate resolution without reworking the PCB. The dual supply rails (AVDD 5 V, DVDD 2.7 V-3.6 V) are typical for high-voltage industrial signal chains and pair naturally with a low-noise LDO such as the TPS7A4701 on the analog rail.
Typical applications include three-phase power-line monitoring, multi-axis motor control, industrial process control, simultaneous-sampled multi-channel data-acquisition systems, and protection relays. Choose the ADS8568SPM when true bipolar inputs and deterministic channel-to-channel phase alignment are mandatory for your measurement algorithm.
جایگزین‌های drop-in برای ADS8568SPM — همان پکیج، سازگار پین‌به‌پین. قطعات با پکیج متفاوت که نیاز به تغییر PCB دارند مستثنی هستند.
گونه‌ها در این سری
مدل‌های هم‌سری که جایگزین مستقیم هستند برای ADS8568SPM (همان فرم‌فاکتور و فوت‌پرینت) — متفاوت در Operating Temperature Range, Package.
ADS8568SPMR
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←ADS8548SPM
✅ جایگزین مستقیم📋 جایگزین مرجع (خارج از کاتالوگ)
ADS8528SPM
✅ جایگزین مستقیم📋 جایگزین مرجع (خارج از کاتالوگ)
ADS8556IPM
✅ جایگزین مستقیم📋 جایگزین مرجع (خارج از کاتالوگ)
ADS8568SPM حداکثر مقادیر مجاز و مشخصات الکتریکی
| رزولوشن | 16 bits |
| Number of Channels | 8 |
| Sampling Architecture | Simultaneous-sampling SAR |
| Max Sample Rate (Parallel) | 540 kSPS per channel |
| Max Sample Rate (Serial) | 450 kSPS per channel |
| محدوده ولتاژ ورودی | ±10 V or ±5 V (bipolar, software-selectable per channel-pair) |
| Analog Supply Voltage (AVDD) | 4.75 V to 5.25 V |
| Digital Supply Voltage (DVDD) | 2.7 V to 3.6 V |
| Total Power Consumption (AVDD) | 335 mW at full throughput |
| Analog Input Impedance | 1 MΩ (input clamp protected) |
| محدوده دمای کاری | -40 °C to +125 °C |
| بسته‌بندی | 64-pin LQFP (PM), 10x10 mm |
| نوع نصب | Surface Mount |
| سطح MSL | 3 (168 hours) |
| وضعیت RoHS | Compliant |
| Digital Interface | Parallel (16-/8-bit) or Serial (SPI-compatible) |
| Internal Reference | Yes (with reference buffer) |
| Auto-Sleep Mode | Yes (programmable wake-up) |
پیکربندی پین ADS8568SPM
| پین 1 | AVDD — Analog supply 5 V |
| پین 2 | AVDD — Analog supply 5 V |
| پین 3 | AGND — Analog ground |
| پین 4 | AV1 — Analog input channel 1 |
| پین 5 | AV2 — Analog input channel 2 |
| پین 6 | AV3 — Analog input channel 3 |
| پین 7 | AV4 — Analog input channel 4 |
| پین 8 | AV5 — Analog input channel 5 |
| پین 9 | AV6 — Analog input channel 6 |
| پین 10 | AV7 — Analog input channel 7 |
| پین 11 | AV8 — Analog input channel 8 |
| پین 12 | REFIO — Reference input/output |
| پین 13 | REFCAP — Reference bypass capacitor |
| پین 14 | AGND — Analog ground |
| پین 15 | AVDD — Analog supply 5 V |
| پین 16 | AGND — Analog ground |
| پین 17 | RESET — Hardware reset (active low) |
| پین 18 | STBY — Standby mode control |
| پین 19 | RANGE — Input range select (10 V/5 V) |
| پین 20 | REFEN — Internal reference enable |
| پین 21 | DB15 — Parallel data bit 15 (MSB) |
| پین 22 | DB14 — Parallel data bit 14 |
| پین 23 | DB13 — Parallel data bit 13 |
| پین 24 | DB12 — Parallel data bit 12 |
| پین 25 | DB11 — Parallel data bit 11 |
| پین 26 | DB10 — Parallel data bit 10 |
| پین 27 | DB9 — Parallel data bit 9 |
| پین 28 | DB8 — Parallel data bit 8 |
| پین 29 | DGND — Digital ground |
| پین 30 | DVDD — Digital supply 3.3 V |
| پین 31 | DB7 — Parallel data bit 7 |
| پین 32 | DB6 — Parallel data bit 6 |
| پین 33 | DB5 — Parallel data bit 5 |
| پین 34 | DB4 — Parallel data bit 4 |
| پین 35 | DB3 — Parallel data bit 3 |
| پین 36 | DB2 — Parallel data bit 2 |
| پین 37 | DB1 — Parallel data bit 1 |
| پین 38 | DB0 — Parallel data bit 0 (LSB) |
| پین 39 | CS — Chip select (active low) |
| پین 40 | RD — Read strobe (parallel mode) |
| پین 41 | BUSY — Conversion in progress |
| پین 42 | FRSTDATA — First data indicator |
| پین 43 | EOC — End of conversion |
| پین 44 | WR — Write/conversion start (parallel mode) |
| پین 45 | CONVST — Conversion start |
| پین 46 | BYTE — Parallel bus width select |
| پین 47 | PAR/SER — Interface mode select |
| پین 48 | DGND — Digital ground |
| پین 49 | DVDD — Digital supply 3.3 V |
| پین 50 | SCLK — Serial clock (serial mode) |
| پین 51 | SDO — Serial data output |
| پین 52 | SDI — Serial data input |
| پین 53 | FS — Frame sync (serial mode) |
| پین 54 | CHSEL0 — Channel select input 0 |
| پین 55 | CHSEL1 — Channel select input 1 |
| پین 56 | CHSEL2 — Channel select input 2 |
| پین 57 | NC — Not connected (per datasheet) |
| پین 58 | NC — Not connected (per datasheet) |
| پین 59 | AGND — Analog ground |
| پین 60 | AVDD — Analog supply 5 V |
| پین 61 | REFGND — Reference ground |
| پین 62 | REFIN — External reference input |
| پین 63 | REFOUT — Internal reference output |
| پین 64 | AGND — Analog ground |
کاربردهای معمول
ADS8568SPM مناسب است برای 6 کاربردs: Three-Phase Power-Line Monitoring, Multi-Axis Motor Control, Industrial Process Control & PLC Analog Input Modules, Protection Relays & Power-Quality Analyzers, Multi-Channel Data-Acquisition Systems (DAQ), Medical Patient Monitoring Equipment.
Three-Phase Power-Line Monitoring
The ADS8568SPM is ideal for three-phase power-line monitoring because its eight simultaneous-sampling channels capture all three phase voltages and three phase currents on the same clock edge, preserving the 120° phase relationships required for accurate real-power, reactive-power, and harmonic calculations. The ±10 V true bipolar input range accepts CT and PT outputs directly without signal conditioning, while the 540 kSPS per-channel throughput supports harmonics analysis well beyond the 50th harmonic of 50/60 Hz mains. The integrated input clamps and anti-aliasing filters reduce external component count for IEC 62053-22 revenue-meter designs. Source: TI ADS85x8 datasheet typical application circuit.
پیشنهادی
Multi-Axis Motor Control
In multi-axis motor-control and robotics applications, the ADS8568SPM samples motor phase currents from multiple axes simultaneously, eliminating the inter-channel skew that would otherwise produce torque-ripple artifacts. Its 16-bit resolution and low aperture delay enable precise field-oriented control (FOC), while the bipolar inputs accept ±10 V or ±5 V Hall-effect sensor and shunt-resistor signals without external level-shift circuitry. The auto-sleep mode cuts power between PWM-aligned conversion windows, reducing thermal load in enclosed motor housings. The 64-LQFP package is well-suited to industrial-temperature (-40 °C to +125 °C) servo drives.
پیشنهادی
Industrial Process Control & PLC Analog Input Modules
The ADS8568SPM serves as the core ADC in PLC analog input modules and process-control front-ends where 8-channel simultaneous sampling is required for batch-recipe and multi-loop PID control. The ±10 V bipolar input range matches legacy 4-20 mA loop-powered transmitters via standard 250 Ω sense resistors, eliminating external instrumentation amplifiers. The 64-LQFP surface-mount package simplifies assembly on EN 61131-2 compliant modules, while the operating temperature range of -40 °C to +125 °C supports cabinet-free mounting near the process. Reference: TI ADS85x8 datasheet industrial-automation applications section.
پیشنهادی
Protection Relays & Power-Quality Analyzers
For numerical protection relays and Class-A power-quality analyzers, the ADS8568SPM delivers the simultaneous sampling and bipolar dynamic range required for fault-recording, transient capture, and EN 50160-compliant measurements. The 540 kSPS per-channel throughput supports oscillography up to ~250 kHz analog bandwidth per channel, while the integrated second-order anti-aliasing filter and on-chip input clamps protect the ADC from surge events that propagate through CT/PT secondaries. Designers can pair it with a real-time DSP or FPGA to implement distance, overcurrent, and differential protection algorithms.
پیشنهادی
Multi-Channel Data-Acquisition Systems (DAQ)
In multi-channel DAQ systems for vibration, acoustic, and structural-test applications, the ADS8568SPM provides 8 truly simultaneous 16-bit channels at 540 kSPS each, enabling coherent multi-sensor sampling across accelerometers, strain gauges, and microphones. The bipolar inputs accommodate ±10 V IEPE-compatible sensor outputs, while the parallel or SPI interface allows direct connection to FPGAs or high-performance MCUs for real-time FFT and modal-analysis processing. The integrated 2nd-order anti-aliasing filter per channel reduces external filter design effort.
پیشنهادی
Medical Patient Monitoring Equipment
In medical patient-monitoring equipment such as multi-lead ECG, EEG, and hemodynamic monitors, the ADS8568SPM samples all acquisition channels synchronously, eliminating the inter-channel skew that would corrupt cardiac-vector timing or evoked-potential latency measurements. The bipolar ±5 V input range matches the differential signal levels produced by instrumentation amplifiers connected to body-surface electrodes. The integrated track-and-hold and anti-aliasing filter minimize front-end analog complexity, supporting IEC 60601-1 compliant designs. Reference: TI ADS85x8 datasheet medical-monitoring typical application section.
پیشنهادی
خلاصه محصولات پیشنهادی
داده‌های مرجع مهندسی برای ADS8568SPM — مقایسه، راهنمای طراحی و اطلاعات انطباق.
راهنمای انتخاب
مقایسه با جایگزین‌ها
| پارامتر | این محصول | ADS8568SPMR | ADS8548SPM | ADS8528SPM | ADS8556IPM |
|---|---|---|---|---|---|
| Package | 64-LQFP (PM) 10x10 mm | 64-LQFP (PM) 10x10 mm - same | 64-LQFP (PM) 10x10 mm - same | 64-LQFP (PM) 10x10 mm - same | 64-LQFP (PM) 10x10 mm - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Resolution | 16 bits | 16 bits | 14 bits | 12 bits | 16 bits |
| Number of Channels | 8 | 8 | 8 | 8 | 6 |
| Input Voltage Range | ±10 V or ±5 V bipolar | ±10 V or ±5 V bipolar | ±10 V or ±5 V bipolar | ±10 V or ±5 V bipolar | ±10 V or ±5 V bipolar |
| Operating Temperature | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C |
تفاوت‌های کلیدی
- True bipolar ±10 V or ±5 V inputs without external signal conditioning (در مقابلADS8556IPM)
- Highest resolution in pin-compatible ADS85x8 family (در مقابلADS8548SPM)
- Reel-packaging variant for high-volume assembly (در مقابلADS8568SPM (tray))
یادداشت‌های طراحی
Bypass AVDD with a 10 µF low-ESR tantalum capacitor plus a 100 nF ceramic placed within 5 mm of the AVDD pin pair (pins 1, 2, 15, 60 on the LQFP-64). The DVDD rail should also have a 1 µF ceramic plus 100 nF on pins 30 and 49. Estimated: using a TPS7A4701 LDO on AVDD reduces switching-ripple coupling below the ADC's noise floor versus a generic switching regulator.
Keep analog input traces short and surround them with a contiguous AGND guard pour to preserve the 1 MΩ input impedance and minimize leakage. Isolate digital switching currents (DB[15:0], SCLK, CS) from the analog section with a single-point ground connection between AGND and DGND near the AGND pin. Reference: TI ADS85x8 datasheet layout guidelines section.
Always tie the PAR/SER, BYTE, and RANGE configuration pins before power-up; mid-supply levels can cause unwanted current draw or interface-mode latch-up. The hardware RESET pin (active low) must be released only after both AVDD and DVDD have stabilized, otherwise the internal state machine may enter an undefined configuration requiring a power cycle to recover.
اطلاعات انطباق
RoHS compliant per DigiKey product listing for ADS8568SPM (DigiKey 2780980). Not AEC-Q100 qualified - choose ADS8568-Q1 variant for automotive applications. Halogen-free per TI product page MSL3 rating.
