ADS8568SPM - 16-Bit 8-Ch Simultaneous-Sampling SAR ADC | TI
MPN: ADS8568SPM ✓ Hoạt độngADS8568SPM Tóm tắt
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.
Bộ thay thế dễ dàng lắp đặt cho ADS8568SPM — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với ADS8568SPM (cùng hình factor và footprint) — khác nhau ở Operating Temperature Range, Package.
ADS8568SPMR
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ADS8548SPM
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADS8528SPM
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADS8556IPM
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADS8568SPM Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 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 |
| Phạm vi điện áp đầu vào | ±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) |
| Khoảng nhiệt độ hoạt động | -40 °C to +125 °C |
| Hộp | 64-pin LQFP (PM), 10x10 mm |
| Kiểu lắp đặt | Surface Mount |
| Cấp MSL | 3 (168 hours) |
| Trạng thái 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) |
Cấu hình chân ADS8568SPM
| Chân 1 | AVDD — Analog supply 5 V |
| Chân 2 | AVDD — Analog supply 5 V |
| Chân 3 | AGND — Analog ground |
| Chân 4 | AV1 — Analog input channel 1 |
| Chân 5 | AV2 — Analog input channel 2 |
| Chân 6 | AV3 — Analog input channel 3 |
| Chân 7 | AV4 — Analog input channel 4 |
| Chân 8 | AV5 — Analog input channel 5 |
| Chân 9 | AV6 — Analog input channel 6 |
| Chân 10 | AV7 — Analog input channel 7 |
| Chân 11 | AV8 — Analog input channel 8 |
| Chân 12 | REFIO — Reference input/output |
| Chân 13 | REFCAP — Reference bypass capacitor |
| Chân 14 | AGND — Analog ground |
| Chân 15 | AVDD — Analog supply 5 V |
| Chân 16 | AGND — Analog ground |
| Chân 17 | RESET — Hardware reset (active low) |
| Chân 18 | STBY — Standby mode control |
| Chân 19 | RANGE — Input range select (10 V/5 V) |
| Chân 20 | REFEN — Internal reference enable |
| Chân 21 | DB15 — Parallel data bit 15 (MSB) |
| Chân 22 | DB14 — Parallel data bit 14 |
| Chân 23 | DB13 — Parallel data bit 13 |
| Chân 24 | DB12 — Parallel data bit 12 |
| Chân 25 | DB11 — Parallel data bit 11 |
| Chân 26 | DB10 — Parallel data bit 10 |
| Chân 27 | DB9 — Parallel data bit 9 |
| Chân 28 | DB8 — Parallel data bit 8 |
| Chân 29 | DGND — Digital ground |
| Chân 30 | DVDD — Digital supply 3.3 V |
| Chân 31 | DB7 — Parallel data bit 7 |
| Chân 32 | DB6 — Parallel data bit 6 |
| Chân 33 | DB5 — Parallel data bit 5 |
| Chân 34 | DB4 — Parallel data bit 4 |
| Chân 35 | DB3 — Parallel data bit 3 |
| Chân 36 | DB2 — Parallel data bit 2 |
| Chân 37 | DB1 — Parallel data bit 1 |
| Chân 38 | DB0 — Parallel data bit 0 (LSB) |
| Chân 39 | CS — Chip select (active low) |
| Chân 40 | RD — Read strobe (parallel mode) |
| Chân 41 | BUSY — Conversion in progress |
| Chân 42 | FRSTDATA — First data indicator |
| Chân 43 | EOC — End of conversion |
| Chân 44 | WR — Write/conversion start (parallel mode) |
| Chân 45 | CONVST — Conversion start |
| Chân 46 | BYTE — Parallel bus width select |
| Chân 47 | PAR/SER — Interface mode select |
| Chân 48 | DGND — Digital ground |
| Chân 49 | DVDD — Digital supply 3.3 V |
| Chân 50 | SCLK — Serial clock (serial mode) |
| Chân 51 | SDO — Serial data output |
| Chân 52 | SDI — Serial data input |
| Chân 53 | FS — Frame sync (serial mode) |
| Chân 54 | CHSEL0 — Channel select input 0 |
| Chân 55 | CHSEL1 — Channel select input 1 |
| Chân 56 | CHSEL2 — Channel select input 2 |
| Chân 57 | NC — Not connected (per datasheet) |
| Chân 58 | NC — Not connected (per datasheet) |
| Chân 59 | AGND — Analog ground |
| Chân 60 | AVDD — Analog supply 5 V |
| Chân 61 | REFGND — Reference ground |
| Chân 62 | REFIN — External reference input |
| Chân 63 | REFOUT — Internal reference output |
| Chân 64 | AGND — Analog ground |
Ứng dụng tiêu biểu
ADS8568SPM phù hợp cho 6 Áp dụngs: 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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ADS8568SPM — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | 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 |
Bảo phân biệt quan trọng
- True bipolar ±10 V or ±5 V inputs without external signal conditioning (vsADS8556IPM)
- Highest resolution in pin-compatible ADS85x8 family (vsADS8548SPM)
- Reel-packaging variant for high-volume assembly (vsADS8568SPM (tray))
Ghi chú thiết kế
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.
Thông tin tuân thủ
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.
