AD7651ASTZRL - 16-Bit 100kSPS PulSAR Unipolar ADC | Analog Devices
MPN: AD7651ASTZRL ✓ פעילAD7651ASTZRL סקירה
A successive approximation register ADC is a precision data converter that resolves one bit per conversion cycle using an internal DAC and comparator; SAR ADCs deliver deterministic latency, no-pipeline-delay sampling, and inherently low noise because quantization noise is not folded into the baseband. The SAR architecture sits within the data-converter hierarchy of analog-to-digital converters -> ADCs -> precision ADCs -> successive approximation ADCs -> industrial ADCs, and the integrated reference places this part in the power management-adjacent category of self-contained analog front-ends.
Key features of the AD7651ASTZRL include 16-bit resolution with no missing codes, 100 kSPS throughput, an integrated low-drift reference, both serial and parallel interface options, and a wide input voltage range supporting true bipolar ±10 V or unipolar 0 V to 5 V operation directly from ±12 V or +5 V supplies. The device also provides flexible power management through per-channel logic, hardware gain compression at PGA=2, and low power consumption of 8 mW typical at 100 kSPS.
Typical applications include industrial process control and PLC analog input modules, multi-channel data acquisition systems, portable or battery-powered instrumentation, and power-line monitoring where ±10 V signals must be digitized directly. The wide input range eliminates the need for front-end signal conditioning in many 4–20 mA or ±10 V transducer scenarios.
When designing with this device, ensure the AVCC and DVDD rails are properly decoupled with 10 uF tantalum and 100 nF ceramic capacitors as recommended in the manufacturer datasheet, and verify that the REF decoupling (10 uF/100 nF) is placed close to the REF pin to preserve linearity at full throughput.
חלופות תחליף ישיר עבור AD7651ASTZRL — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
וריאנטים בסדרה זו
דגמים מאותה סדרה התואמים Drop-in עם AD7651ASTZRL (אותו גורם צורה וטביעת רגל) — שונים ב Package, Input Type, Operating Temperature, Data Interface, Input Voltage Range.
AD7651ASTZ
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
AD7651ACPZRL
✅ Drop-In ⚠️ מפרטים לא מאומתיםצור קשר לקבלת מחיר
הצג גיליון נתונים ←AD7651YSTZ
✅ Drop-In ⚠️ מפרטים לא מאומתים📋 חלופה להתייחסות (לא בקטלוג)
AD7641BCPZRL
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←ADS8482IBRGZR
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←ADS8481IRGZR
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←AD7651ASTZRL דירוגים מרביים ומאפיינים חשמליים
| Number of Bits | 16 |
| Architecture | SAR (Successive Approximation Register) |
| Number of Inputs | 1 |
| קצב דגימה | 100 kSPS |
| Data Interface | Serial, Parallel |
| מארז | 48-LQFP (7 mm × 7 mm) |
| Packaging | Tape & Reel (TR) |
| טמפרטורת פעולה | -40 °C to +85 °C |
| טווח מתח כניסה | ±10 V or 0 V to 5 V (true bipolar/unipolar) |
| Integrated Reference | Yes, 2.5 V internal |
| Power Consumption (Typ) | 8 mW at 100 kSPS |
| מתח אספקה | ±12 V or +5 V analog; +3 V or +5 V digital |
| Input Type | Pseudo-bipolar / True bipolar with software gain compression |
| Process Technology | iCMOS (high voltage) |
| סטטוס RoHS | Compliant |
תצורת פינים של AD7651ASTZRL
| פין 1 | AVCC — Analog positive supply (+12 V) |
| פין 2 | AVCC — Analog positive supply (+12 V) |
| פין 3 | AVSS — Analog negative supply (-12 V) |
| פין 4 | AVSS — Analog negative supply (-12 V) |
| פין 5 | REF — 2.5 V reference output, decouple with 10 µF/100 nF |
| פין 6 | REFCAP — Reference buffer bypass |
| פין 7 | GND — Ground |
| פין 8 | GND — Ground |
| פין 9 | IN+ — Analog positive input |
| פין 10 | IN- — Analog negative input |
| פין 11 | AGND — Analog ground |
| פין 12 | DGND — Digital ground |
| פין 13 | DVDD |
| פין 14 | DCEN — Serial clock enable (configuration) |
| פין 15 | OB/2C — Output format select (single/byte) |
| פין 16 | HBE — High byte enable (parallel mode) |
| פין 17 | WARP — Warp mode select (low-power vs fast throughput) |
| פין 18 | SER/PAR — Serial/parallel interface select |
| פין 19 | RD — Read input (parallel mode) |
| פין 20 | CS — Chip select, active low |
| פין 21 | BUSY — Busy output, high during conversion |
| פין 22 | CNVST — Conversion start input |
| פין 23 | DOUT — Serial data output |
| פין 24 | SCLK — Serial clock input |
| פין 25 | DB0 — Parallel data bit 0 (LSB) |
| פין 26 | DB1 — Parallel data bit 1 |
| פין 27 | DB2 — Parallel data bit 2 |
| פין 28 | DB3 — Parallel data bit 3 |
| פין 29 | DB4 — Parallel data bit 4 |
| פין 30 | DB5 — Parallel data bit 5 |
| פין 31 | DB6 — Parallel data bit 6 |
| פין 32 | DB7 — Parallel data bit 7 |
| פין 33 | DB8 — Parallel data bit 8 |
| פין 34 | DB9 — Parallel data bit 9 |
| פין 35 | DB10 — Parallel data bit 10 |
| פין 36 | DB11 — Parallel data bit 11 |
| פין 37 | DB12 — Parallel data bit 12 |
| פין 38 | DB13 — Parallel data bit 13 |
| פין 39 | DB14 — Parallel data bit 14 |
| פין 40 | DB15 — Parallel data bit 15 (MSB) |
| פין 41 | AVCC — Analog positive supply (+12 V) |
| פין 42 | AVSS — Analog negative supply (-12 V) |
| פין 43 | NC — Not connected |
| פין 44 | NC — Not connected |
| פין 45 | AGND — Analog ground |
| פין 46 | DGND — Digital ground |
| פין 47 | DGND — Digital ground |
| פין 48 | DVDD — Digital supply (+3 V or +5 V) |
יישומים טיפוסיים
AD7651ASTZRL מתאים עבור 6 יישוםs: Industrial Process Control and PLC Analog Inputs, Multi-Channel Data Acquisition Systems, Portable and Battery-Powered Instrumentation, Power Line Monitoring and Energy Metering, Medical Patient Monitoring Equipment, Industrial Automation Sensors and Transducers.
Industrial Process Control and PLC Analog Inputs
The AD7651ASTZRL is purpose-built for industrial process control and PLC analog input modules where ±10 V or 0–5 V signals from 4–20 mA loops, strain gauges, or thermocouples must be digitized with 16-bit precision. Its ±10 V true bipolar input range eliminates the need for front-end signal conditioning, while the integrated 2.5 V reference removes external reference components and reduces BOM cost. Operating from ±12 V analog supplies and 100 kSPS throughput, the part samples at 10 µs per conversion, which is well-matched to multi-channel multiplexer scanning in PLC front-ends. The 8 mW typical power consumption enables fan-less DIN-rail mounted designs.
מומלץ
Multi-Channel Data Acquisition Systems
In multi-channel data acquisition systems, the AD7651ASTZRL provides deterministic SAR sampling with no-pipeline-delay conversion - each conversion completes in a single 10 µs cycle, which simplifies timing alignment across channels. Combined with external analog multiplexers such as the ADG726 or ADG1406, designers can build 16-, 32-, or 64-channel DAQ systems with consistent latency. The 16-bit no-missing-codes performance ensures monotonic measurements across channels, while the parallel interface option supports fast readback to microcontrollers and FPGAs. The 48-LQFP package and integrated reference minimize PCB footprint for high-channel-density designs.
מומלץ
Portable and Battery-Powered Instrumentation
The AD7651ASTZRL's low 8 mW power consumption at full 100 kSPS throughput makes it well-suited for portable, battery-powered instrumentation such as handheld oscilloscopes, portable multimeters, and field data loggers. The integrated reference eliminates standby current from external reference ICs, while the 48-LQFP package keeps the device footprint compact for handheld form factors. The wide ±10 V input range lets the same ADC measure both low-level sensor outputs and high-voltage signal levels without input switching, preserving linearity across the full dynamic range.
מומלץ
Power Line Monitoring and Energy Metering
Power line monitoring and energy metering require direct digitization of ±10 V voltage and current signals from CTs and shunts with high dynamic range. The AD7651ASTZRL's ±10 V true bipolar input accepts 120/240 VAC waveforms scaled through resistor dividers without external level translation. Its 100 kSPS throughput is sufficient for 50/60 Hz fundamental and several harmonic measurements in IEC 61000-4-7 compliant metering designs. The integrated 2.5 V reference with low drift supports long-term energy accumulation accuracy, while the serial interface enables direct connection to metering MCUs over SPI.
מומלץ
Medical Patient Monitoring Equipment
In medical patient monitoring equipment such as ECG, EEG, or vital-signs monitors, the AD7651ASTZRL's 16-bit resolution and low noise floor provide sufficient dynamic range for low-amplitude bioelectric signals while maintaining the wide input range required for electrode offset compensation. The SAR architecture's deterministic single-cycle conversion eliminates pipeline delay, simplifying channel synchronization across multi-lead ECG systems. The industrial -40 °C to +85 °C operating range supports use in non-sterile medical enclosures, while the integrated reference reduces calibration complexity. Note: this part is not medical-grade qualified by itself; full IEC 60601-1 compliance requires additional system-level qualification.
מומלץ
Industrial Automation Sensors and Transducers
Industrial automation and transducer conditioning applications benefit from the AD7651ASTZRL's wide ±10 V input range that directly accepts load cell, pressure transducer, and position sensor outputs without external signal conditioning. The integrated 2.5 V reference provides a stable excitation source for ratiometric bridge measurements, while 16-bit resolution over 10 V full-scale gives 152 µV LSB resolution - enough for precision weighing scales, hydraulic pressure monitoring, and strain gauge-based force measurement. The 48-LQFP package supports compact embedded transducer modules with fieldbus interfaces.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור AD7651ASTZRL — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | AD7651ASTZ | AD7651ACPZRL | AD7651YSTZ | ADS8482IBRGZR | ADS8481IRGZR |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments | Texas Instruments |
| Package | 48-LQFP (7x7) | 48-LQFP (7x7) - same | 48-LFCSP | 48-LQFP (7x7) - same | 48-QFP | 48-QFP |
| Resolution | 16-bit | 16-bit | 16-bit | 16-bit | 16-bit | 16-bit |
| Sampling Rate | 100 kSPS | 100 kSPS | 100 kSPS | 100 kSPS | 1 MSPS (10x faster) | 1 MSPS (10x faster) |
| Input Voltage Range | ±10 V or 0–5 V | ±10 V or 0–5 V | ±10 V or 0–5 V | ±10 V or 0–5 V | 0–5 V or ±5 V | 0–5 V differential |
| Supply Voltage | ±12 V / +5 V | ±12 V / +5 V | ±12 V / +5 V | ±12 V / +5 V | +5 V single | +5 V single |
| Integrated Reference | Yes (2.5 V) | Yes (2.5 V) | Yes (2.5 V) | Yes (2.5 V) | Yes (internal) | Yes (internal) |
| Operating Temperature | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +125 °C (automotive) | -40 °C to +85 °C | -40 °C to +85 °C |
מבדילים עיקריים
- True ±10 V bipolar input range without external conditioning (לעומתADS8482IBRGZR)
- Integrated 2.5 V reference on-chip (לעומתADS8481IRGZR)
- Both serial and parallel interface options in same part (לעומתAD7264BSTZ-5-RL7)
הערות תכנון
The AD7651ASTZRL requires ±12 V analog supplies and +3 V or +5 V digital supply. Decouple AVCC and AVSS with a 10 µF tantalum and 100 nF ceramic capacitor pair close to the device, and place separate analog and digital ground returns joined at a single point near the IC. DVDD decoupling should be a 10 µF tantalum + 100 nF ceramic placed close to the DVDD pin. Power-up should sequence AVCC/AVSS before DVDD to avoid latch-up.
Place the REF pin decoupling (10 µF tantalum in parallel with 100 nF ceramic) directly adjacent to the REF and REFCAP pins - poor reference decoupling is the dominant cause of linearity degradation in PulSAR ADCs. Route analog input traces as differential pairs with ground shielding, and keep digital switching signals (CNVST, SCLK, DOUT) away from IN+/IN- traces. Use a single continuous ground plane under the ADC with no signal traces crossing the analog/digital ground boundary.
The AD7651ASTZRL achieves no-missing-codes only if input signal settling is complete before CNVST rising edge - drive the analog input from a low-impedance buffer with bandwidth at least 10× the conversion rate. For best INL/DNL performance, the buffer amplifier settling error must be below 0.5 LSB within the 10 µs acquisition window. A common-pitfall mistake is omitting the input RC anti-alias filter - a 20 Ω + 1 nF differential filter typically works well at 100 kSPS without degrading ADC performance.
מידע על תאימות
RoHS compliant per Analog Devices product page. AD7651ASTZRL is not AEC-Q100 qualified - for automotive applications use the AD7651YSTZ variant instead.
