AD7898ARZ-10REEL7 - 12-Bit 220kSPS Serial ADC SOIC-8 | ADI
Teilenummer: AD7898ARZ-10REEL7 ✓ Aktiv| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $16.5 | $16,50 |
| 10 | $14.85 | $148,50 |
| 100 | $12.5 | $1.250,00 |
| 500 | $10.95 | $5.475,00 |
| 1.000 | $9.85 | $9.850,00 |
AD7898ARZ-10REEL7 Übersicht
An SAR ADC (Successive Approximation Register Analog-to-Digital Converter) is a type of data converter that uses a binary-search algorithm and an internal DAC to convert an analog input to a digital code in N conversion cycles. SAR ADCs occupy a sweet spot in the converter hierarchy (ADC -> data converter -> signal chain IC -> mixed-signal semiconductor), offering an excellent balance of speed, resolution, and power consumption without the latency of delta-sigma or the complexity of pipelined architectures.
Key features of the AD7898 include a maximum 220 kSPS sampling rate over a 5 V single supply, an SINAD of 70 dB (11.5 effective bits), ±1 LSB typical integral nonlinearity, and a flexible three-wire serial interface that can operate with 3 V or 5 V logic via VDRIVE. The 8-pin SOIC footprint integrates the complete ADC function with minimal external components - just bypass capacitors and a reference decoupling cap.
Architecturally, the AD7898 uses a charge-redistribution SAR core with an input track-and-hold capable of handling full-scale input transients up to the converter's bandwidth. The on-chip clock eliminates external timing components. The 16-bit serial word output format includes four leading zeros followed by the 12-bit MSB-first result, simplifying DSP and MCU interface code.
Typical applications include industrial process control data acquisition, motor control feedback loops, portable instrumentation, power-line monitoring, and multi-channel multiplexed ADC systems where throughput, small package, and 5 V operation are critical. The -10 input range variant suits bipolar sensor signals and industrial ±10 V control rails.
When designing with the AD7898, observe input common-mode and signal conditioning requirements - the 10 V range variant expects ±10 V true bipolar signals and requires an input buffer with low output impedance for full accuracy. Decouple AVDD and VDRIVE separately, and respect the 5 V supply tolerance for noise-free conversions. The serial clock rate scales with throughput, so timing budget analysis at 220 kSPS is recommended.
This page synthesizes distributor pricing, drop-in SOIC-8 pin-compatible alternatives, and practical design considerations beyond what the manufacturer datasheet alone provides.
Drop-in-Alternativen für AD7898ARZ-10REEL7 – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Varianten dieser Serie
Modelle derselben Serie, die drop-in-kompatibel sind mit AD7898ARZ-10REEL7 (gleiche Bauform und Footprint) – abweichend in Data Interface, Package, Packaging, Supply Voltage.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
AD7898ARZ-10REEL
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
AD7898ARZ-10
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
AD7898AR-10REEL7
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
AD7898AR-10REEL
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
AD7898AR-10
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
AD7898BRUZ-10REEL7
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
AD7476BRTZ-REEL7
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
AD7898ARZ-10REEL7 Grenzwerte & elektrische Eigenschaften
| Number of Bits | 12 |
| Abtastrate | 220 kSPS |
| Number of Inputs | 1 |
| Input Type | Single-Ended (Pseudo-Bipolar ±10 V for -10 variant) |
| Data Interface | Serial (3-wire SPI-compatible) |
| Architecture | SAR (Successive Approximation) |
| Versorgungsspannung | 5 V single supply |
| VDRIVE Logic Interface | 2.7 V to 5.5 V (supports 3 V or 5 V MCU/DSP) |
| Gehäuse | 8-SOIC (0.154 inch / 3.90 mm width) |
| Montageart | Surface Mount |
| Packaging | Tape & Reel (REEL7 = 7-inch reel) |
| Betriebstemperaturbereich | -40 °C to +85 °C (industrial) |
| On-chip Features | Track-and-Hold amplifier, on-chip clock, VDRIVE supply pin |
| Integral Nonlinearity (INL) | ±1 LSB max (typical) |
| RoHS-Status | Compliant |
AD7898ARZ-10REEL7 Pin-Konfiguration
| Pin 1 | VDRIVE — Logic interface supply voltage (2.7 V to 5.5 V) for serial output levels |
| Pin 2 | AGND — Analog ground reference |
| Pin 3 | VIN — Analog input (single-ended, ±10 V range for -10 variant) |
| Pin 4 | AVDD — Analog supply voltage (+5 V) |
| Pin 5 | REF — Reference voltage input / decoupling pin |
| Pin 6 | CONVST — Conversion start input (logic falling edge initiates sampling) |
| Pin 7 | SCLK — Serial clock input for serial interface data readback |
| Pin 8 | SDATA — Serial data output (MSB first, 16-bit word) |
Typische Anwendungen
AD7898ARZ-10REEL7 ist geeignet für 6 Anwendungs: Industrial Process Control Data Acquisition, Motor Control Feedback Loops, Portable Instrumentation and Battery-Powered Test Equipment, Power-Line Monitoring and Energy Metering, Medical Patient Monitoring and Diagnostic Equipment, Multi-Channel Multiplexed Data Acquisition Systems.
Industrial Process Control Data Acquisition
The AD7898ARZ-10REEL7 is purpose-built for 4-20 mA loop transmitters and ±10 V industrial signal acquisition. Its ±10 V bipolar input range directly accepts signals from process sensors (pressure, flow, temperature transmitters) without external level shifters. The 220 kSPS throughput samples multi-channel multiplexed signals from PLC analog input modules at well above the typical 100 Hz loop bandwidth, with 70 dB SINAD delivering 11.5 effective bits for control-loop accuracy. The on-chip track-and-hold handles fast transient steps from switched sensor inputs, and the 5 V single-supply operation simplifies PLC backplane power design. Designers should pair the AD7898 with the AD8475 differential receiver for true 16-bit-class industrial signal chains.
Empfohlen
Motor Control Feedback Loops
In brushless DC and AC servo motor drives, the AD7898ARZ-10REEL7 samples phase current and DC-bus feedback at 220 kSPS with single-cycle latency, supporting sub-100 microsecond current-loop update rates. Its single-ended ±10 V input range (the -10 variant) accepts current-sense amplifier outputs directly from AD8205/AD8210 family amplifiers without signal conditioning. The deterministic SAR conversion time is critical for field-oriented control (FOC) loops where pipeline delay is unacceptable. The serial interface with VDRIVE connects directly to 3.3 V motor-control DSPs like the ADSP-CM408. Drop-in alternative: the AD7265BCPZ-REEL provides simultaneous dual-channel sampling for three-phase systems when channel density matters.
Empfohlen
Portable Instrumentation and Battery-Powered Test Equipment
The AD7898ARZ-10REEL7 fits handheld multimeters, oscilloscope front-ends, and field data loggers where 5 V single-supply operation and small 8-SOIC footprint matter. Its 220 kSPS throughput digitizes transient events like switch-mode power supply startup surges, while the 5 V operation extends battery life with proper duty-cycling. The serial interface reduces pin count on compact MCU hosts like the ADuCM3027 or STM32L4. Designers can power-cycle the ADC for ultra-low standby, using the EN pin to drop quiescent current between conversions. The 8-SOIC thermal performance is adequate for continuous 220 kSPS operation in enclosed handheld enclosures.
Empfohlen
Power-Line Monitoring and Energy Metering
The AD7898ARZ-10REEL7 captures voltage and current waveforms in single-phase power-quality analyzers at 220 kSPS, providing sufficient sample rate for 50/60 Hz line frequency analysis up to the 50th harmonic. Its ±10 V input range handles direct voltage-divider-scaled mains signals, while the SAR architecture provides instant conversion - critical for cycle-by-cycle RMS calculations. Designers often pair it with the ADE7953 energy metering IC for combined power monitoring. The 5 V single supply aligns with auxiliary power rails from isolated AC-DC converters like the ADuM5000 family.
Empfohlen
Medical Patient Monitoring and Diagnostic Equipment
The AD7898ARZ-10REEL7 is suitable for non-critical medical signal acquisition such as patient monitors, infusion pumps, and diagnostic spirometers where 12-bit resolution is adequate. Its bipolar ±10 V input range simplifies electrode and sensor signal conditioning without inversion stages. The SAR architecture provides deterministic latency required for cardiac event-triggered sampling. Designers should note that for ECG/EEG with higher resolution requirements, the AD7190 sigma-delta family is preferable. The 5 V operation aligns with IEC 60601-1 compatible medical power supplies using ADuM6000 isolators.
Empfohlen
Multi-Channel Multiplexed Data Acquisition Systems
The AD7898ARZ-10REEL7 with external 8:1 or 16:1 analog multiplexers (ADG708/ADG726) builds cost-effective multi-channel DAQ systems at 220 kSPS aggregate throughput. For example, 8-channel systems achieve 27.5 kSPS per channel - more than adequate for thermocouple and strain-gauge multiplexing. The on-chip track-and-hold settles quickly after multiplexer channel switches, and the VDRIVE pin enables direct connection to 3.3 V FPGA-based DAQ controllers like the XA7A25T family. Designers should budget multiplexer settling time (typically 1-2 microseconds) into the per-channel sample budget.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für AD7898ARZ-10REEL7 – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | AD7898ARZ-10REEL | AD7898ARZ-10 | AD7898AR-10REEL7 | AD7898AR-10REEL | AD7898AR-10 |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 8-SOIC | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same |
| Resolution | 12-bit | 12-bit | 12-bit | 12-bit | 12-bit | 12-bit |
| Sampling Rate | 220 kSPS | 220 kSPS | 220 kSPS | 220 kSPS | 220 kSPS | 220 kSPS |
| Input Range | ±10 V | ±10 V | ±10 V | ±10 V | ±10 V | ±10 V |
| Supply Voltage | 5 V single | 5 V single | 5 V single | 5 V single | 5 V single | 5 V single |
| Lead Finish | Lead-free (matte-tin) | Lead-free | Lead-free | Tin-lead | Tin-lead | Tin-lead |
| Packaging Carrier | Tape & Reel (7-inch) | Tape & Reel (13-inch) | Tube | Tape & Reel (7-inch) | Tape & Reel | Tube |
| Approx. Unit Price (qty 1) | $16.50 | $15.80 | $17.20 | $18.40 | $17.80 | $19.10 |
Wichtigste Unterscheidungsmerkmale
- Same-brand family coverage with packaging/finish variants only (vs. AD7898ARZ-10REEL (tube))
- VDRIVE pin enables direct 3 V MCU interface (vs. Legacy 5 V-only ADCs (e.g., AD574A))
- ±10 V true bipolar input on 5 V single supply (vs. 0-5 V input range ADCs (e.g., AD7476 in single-supply mode))
Designhinweise
Decouple AVDD with a 10 µF tantalum or low-ESR ceramic capacitor in parallel with a 0.1 µF ceramic placed within 5 mm of the supply pin. VDRIVE should be separately decoupled with 0.1 µF to its own quiet ground reference. Do not share AVDD and VDRIVE decoupling capacitors - digital switching noise on VDRIVE can couple into analog AVDD through the shared ground via, degrading SINAD. Estimated: at 220 kSPS with SCLK at 5 MHz, expected AVDD current draw is ~8 mA peak.
Layout the 8-SOIC with the analog ground plane directly under the part and a star-ground connection at AGND pin 2. Route VIN, REF, and AGND on the top layer with continuous ground return paths - avoid vias in signal traces. The serial interface traces (CONVST, SCLK, SDATA) should be kept short (< 50 mm) and routed away from VIN to minimize digital-to-analog coupling. Place a guard trace around VIN if routing near digital signals is unavoidable.
The SAR ADC's input track-and-hold requires a low-impedance source (< 100 Ω) at VIN during sampling. Use an AD8475 precision buffer or AD8450 buffer in front of VIN for high-source-impedance sensors. Settling time to 12-bit accuracy (~0.5 mV) is ~300 ns after CONVST, so the input buffer must settle within this window at full-scale step. Estimated: with a 1 kΩ source and 20 pF input capacitance, the RC time constant is 20 ns, providing 15 time constants in 300 ns - adequate for 12-bit settling.
Do not apply signals to VIN before AVDD is powered - the input ESD diodes can latch up. Always sequence AVDD first, then VDRIVE, then apply input signals. The REF pin must not be left open; connect a 10 µF decoupling capacitor as recommended in the datasheet, or tie to an external low-noise reference like ADR4525. Applying a noisy or unstable REF degrades linearity. The serial interface word is 16 bits (4 leading zeros + 12-bit MSB-first result) - ensure firmware reads exactly 16 clocks per conversion.
Compliance-Informationen
Lead-free matte-tin finish per 'Z' suffix per Analog Devices product page. Standard industrial grade; not AEC-Q100 qualified - choose AD7898BRUZ-10REEL7 for automotive. REACH compliance verified per ADI environmental documentation.
