AD7899AR-3REEL - 14-Bit 400kSPS 5V ADC | Analog Devices
MPN: AD7899AR-3REEL ✓ فعالAD7899AR-3REEL جائزہ
An ADC (analog-to-digital converter) is a data-conversion integrated circuit that translates real-world analog signals into discrete digital codes for downstream processing by microcontrollers, DSPs, FPGAs, or ASICs. Within the broader IC hierarchy, successive-approximation ADCs (SAR ADCs) sit between slow precision delta-sigma converters and high-speed flash converters, offering an attractive balance of resolution, sample rate, latency, and power consumption for general-purpose data acquisition. The AD7899 belongs to this SAR family, targeting applications that need deterministic single-conversion latency and moderate (14-bit) resolution without the complexity of a bipolar supply.
Key features: 14-bit resolution with no missing codes, 400 kSPS throughput, 2.0 µs acquisition time on the front-end track/hold, ±10 V true-bipolar input range on the -3 variant, single +5 V supply operation (no ±15 V rails required), and an internal 2.5 V reference that simplifies external BOM. The parallel interface allows direct connection to 8/16-bit microcontrollers, DSPs, or FPGA banks without glue logic, and the SOIC-28 wide-body package gives the part excellent thermal headroom for continuous sampling.
Typical applications include industrial process control loops (4-20 mA loop transmitters, multi-channel PLC analog front ends), motor control current/voltage sensing on 5 V supply rails, instrumentation and data-acquisition systems running on +5 V digital supplies, and optical/networked system monitoring boards. Designers select the AD7899AR-3REEL when they need true ±10 V input range, single +5 V supply, and 14-bit resolution on one die.
Design tip: Because the input stage divides down the ±10 V range to fit a 5 V ADC core, the analog input presents a finite source impedance of about 4 kohm in parallel with a few pF of capacitance; place an external op-amp buffer with low output impedance if the source impedance of the transducer is non-negligible. Operating the part at full 400 kSPS and feeding the LSBs requires attention to PCB layout - keep AGND/DAGND separation, decouple VDD with 10 µF + 100 nF, and route analog traces away from digital switching edges.
This page consolidates datasheet specifications, authorized distributor pricing, verified drop-in alternatives in the same SOIC-28 footprint, and PCB design guidance not always presented on the manufacturer datasheet cover page.
کے لیے ڈراپ اِن متبادل AD7899AR-3REEL — یکساں پیکیج، پن سے پن مطابقت پذیر۔ مختلف پیکیج والے پرزے جن کے لیے PCB دوبارہ کام درکار ہو، شامل نہیں ہیں۔
اس سیریز میں مختلف ورژن
اسی سیریز کے ماڈلز جو ڈراپ اِن مطابقت رکھتے ہیں AD7899AR-3REEL (یکساں فارم فیکٹر اور فٹ پرنٹ) — میں مختلف Conversion Time, Operating Temperature, Package, Supply Voltage (Single).
AD7899ARZ-3REEL
✅ ڈراپ-اِن📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
AD7899AR-3
✅ ڈراپ-اِن📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
AD7899ARZ-3
✅ ڈراپ-اِن📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
AD7899AR-1REEL
✅ ڈراپ-اِن📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
AD7899AR-2REEL
✅ ڈراپ-اِن📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
AD7899AR-3REEL زیادہ سے زیادہ ریٹنگز اور برقی خصوصیات
| ریزولوشن | 14 bits |
| Number of Channels | 1 |
| Architecture | SAR (Successive Approximation) |
| Sample Rate | 400 kSPS |
| Acquisition Time (Track/Hold) | 0.3 µs |
| Conversion Time | 2.0 µs / 2.2 µs |
| Input Voltage Range (-3 variant) | ±10 V |
| Input Voltage Range (-1 variant) | 0 V to +5 V |
| Input Voltage Range (-2 variant) | ±5 V |
| Supply Voltage (Single) | +5 V (±5%) |
| Internal Reference | 2.5 V |
| انٹرفیس | Parallel |
| آپریٹنگ درجہ حرارت | -40 °C to +85 °C |
| پیکیج | 28-pin SOIC (Wide) |
| ماؤنٹنگ ٹائپ | Surface Mount |
| Lead-Free / RoHS | Compliant (per -REEL suffix marking convention) |
AD7899AR-3REEL پن کنفیگریشن
| پن 1 | DGND — Digital ground |
| پن 2 | DB0 — Parallel data bit 0 (LSB) |
| پن 3 | DB1 — Parallel data bit 1 |
| پن 4 | DB2 — Parallel data bit 2 |
| پن 5 | DB3 — Parallel data bit 3 |
| پن 6 | DB4 — Parallel data bit 4 |
| پن 7 | DB5 — Parallel data bit 5 |
| پن 8 | DB6 — Parallel data bit 6 |
| پن 9 | DB7 — Parallel data bit 7 |
| پن 10 | DB8 — Parallel data bit 8 |
| پن 11 | DB9 — Parallel data bit 9 |
| پن 12 | DB10 — Parallel data bit 10 |
| پن 13 | DB11 — Parallel data bit 11 |
| پن 14 | DB12 — Parallel data bit 12 |
| پن 15 | DB13 — Parallel data bit 13 (MSB) |
| پن 16 | EOC — End-of-conversion output |
| پن 17 | CONVST — Conversion start input |
| پن 18 | CS — Chip-select input |
| پن 19 | RD — Read input |
| پن 20 | BUSY — Busy output (during conversion) |
| پن 21 | DVDD — Digital +5 V supply |
| پن 22 | AVDD — Analog +5 V supply |
| پن 23 | VREF — Internal 2.5 V reference (decouple externally) |
| پن 24 | REFIN — External reference input (if unused, tie to internal VREF) |
| پن 25 | AGND — Analog ground |
| پن 26 | AIN+ — Analog input (positive) |
| پن 27 | AIN- — Analog input (negative / GND-sense for bipolar) |
| پن 28 | DGND — Digital ground (alternate bond) |
عام استعمالات
AD7899AR-3REEL کے لیے موزوں ہے 6 ایپلیکیشنs: Industrial Process Control / PLC Analog Front End, Motor Control Current/Voltage Sensing, Portable Data Acquisition Systems, Optical Module / Telemetry Monitoring, Test & Measurement / Bench Instrumentation, Audio/Broadcast Equipment Signal Acquisition.
Industrial Process Control / PLC Analog Front End
The AD7899AR-3REEL is well matched to industrial PLC analog front ends because its ±10 V true-bipolar input range directly digitizes legacy 4-20 mA loop outputs through a 250 ohm sense resistor (±10 V swing). The 14-bit no-missing-codes resolution provides 12+ effective bits at the typical 10 kSPS industrial update rate, and the 0.3 µs acquisition time captures fast transient events. Single +5 V operation removes the need for ±15 V rails in tightly packed PLC backplanes. Use a follower op-amp in front of the analog input to drive the ~4 kohm source impedance; parallel interface connects directly to the PLC host CPU.
تجویز کردہ
Motor Control Current/Voltage Sensing
The AD7899AR-3REEL handles motor control current-sense and DC-bus voltage sensing where ±10 V input range accommodates shunt-derived signals at full PWM switching excursions. The 400 kSPS sample rate is faster than typical 10 kHz current-loop control bandwidths, enabling precise phase-current measurement at the FOC controller's required update rate. Its 2.5 V internal reference can also drive an external scaling divider chain, allowing ±12 V extended input when paired with a resistive divider + buffer. The robust SOIC-28 wide package offers excellent thermal headroom for continuous high-duty-cycle sampling in industrial servo drives.
تجویز کردہ
Portable Data Acquisition Systems
The AD7899AR-3REEL suits portable data-acquisition modules because it works from a single +5 V USB-powered rail - no bulky ±15 V supplies needed - while still digitizing ±10 V transducers. The parallel interface allows direct connection to microcontrollers that lack ADC resources, with 400 kSPS throughput sufficient for audio-bandwidth vibration, strain, or acoustic measurements. The internal 2.5 V reference eliminates one precision analog rail entirely, simplifying BOM. Designers should use the AR-3REEL variant when the transducer spans ±10 V (e.g., load cells, accelerometers), reducing system cost vs. external signal-conditioning chains.
تجویز کردہ
Optical Module / Telemetry Monitoring
The AD7899AR-3REEL monitors supply rails and bias currents in optical line-card and telemetry modules, digitizing analog telemetry with ±10 V input headroom to handle supervisory voltages above the 5 V logic rails. The 400 kSPS throughput is plenty for supervisory loops that update at 100 Hz, with spare bandwidth for capturing transient alarms. Its 28-pin SOIC wide package footprint mates cleanly to telecom line-card PCB standards, and the single +5 V supply matches existing power-distribution ICs in the system. The internal 2.5 V reference can also drive other ADCs via the AGND plane.
تجویز کردہ
Test & Measurement / Bench Instrumentation
The AD7899AR-3REEL suits bench-top multimeters and data loggers where 14-bit resolution over a ±10 V input range delivers 1.22 mV LSB and DC accuracy suitable for general-purpose instrumentation. The 400 kSPS burst rate is fast enough for handheld oscilloscope-style trigger capture, while the deterministic 2.0 µs SAR conversion time avoids the latency of oversampled converters. The wide-body SOIC package handles continuous high-duty-cycle sampling at industrial temperatures without thermal derating, and the parallel interface drops directly onto FPGA DSP banks for waveform analysis.
تجویز کردہ
Audio/Broadcast Equipment Signal Acquisition
The AD7899AR-3REEL works in professional audio and broadcast equipment for digitizing line-level +4 dBu balanced signals after external scaling, with ±10 V input range offering ample headroom for transient peaks of 12 dBu to 18 dBu. Its 14-bit resolution and 400 kSPS rate are appropriate for audio-bandwidth sampling (44.1 kSPS PCM-data paths with oversampling), and the SOIC-28 wide footprint is mechanically robust for broadcast rack chassis. The single +5 V supply side-steps the need for ±15 V analog rails inside audio gear. Designers typically pair it with an external op-amp LPF for alias rejection above the Nyquist edge.
تجویز کردہ
تجویز کردہ پروڈکٹس کا خلاصہ
کے لیے انجینئرنگ ریفرنس ڈیٹا AD7899AR-3REEL — موازنہ، ڈیزائن رہنمائی، اور تعمیل کی معلومات۔
انتخاب کی گائیڈ
متبادلات کے ساتھ موازنہ
| پیرامیٹر | یہ پروڈکٹ | AD7899ARZ-3REEL | AD7899AR-3 | AD7899ARZ-3 | AD7899AR-1REEL | AD7899AR-2REEL |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 28-pin SOIC (Wide) | 28-pin SOIC (Wide) - same | 28-pin SOIC (Wide) - same | 28-pin SOIC (Wide) - same | 28-pin SOIC (Wide) - same | 28-pin SOIC (Wide) - same |
| Resolution | 14-bit | 14-bit | 14-bit | 14-bit | 14-bit | 14-bit |
| Sample Rate | 400 kSPS | 400 kSPS | 400 kSPS | 400 kSPS | 400 kSPS | 400 kSPS |
| Input Voltage Range | ±10 V | ±10 V | ±10 V | ±10 V | 0 V to +5 V | ±5 V |
| Supply Voltage | +5 V single | +5 V single | +5 V single | +5 V single | +5 V single | +5 V single |
| Internal Reference | 2.5 V | 2.5 V | 2.5 V | 2.5 V | 2.5 V | 2.5 V |
| Lead Finish / RoHS | Leaded (legacy), RoHS varies | Lead-free (Pb-free), RoHS-compliant | Leaded (legacy), RoHS varies | Lead-free (Pb-free), RoHS-compliant | Leaded (legacy), RoHS varies | Leaded (legacy), RoHS varies |
اہم امتیازی خصوصیات
- True ±10 V bipolar input range on a single +5 V supply (بمقابلہAD7899AR-1REEL)
- Factory-authorized RoHS drop-in alternative available (بمقابلہAD7899ARZ-3REEL)
- Internal 2.5 V reference included (بمقابلہExternal reference AD780)
ڈیزائن نوٹس
Estimated: place AGND/DGND nets with a single-star connection under the part rather than a flooded plane; the wide-body SOIC has dedicated pins 25 (AGND) and 1 or 28 (DGND) which are not internally bonded, so good layout hygiene prevents ground-noise coupling into the analog input. Decouple AVDD and DVDD independently with a 10 µF tantalum + 100 nF ceramic each; share only at the supply connector. Estimated based on pin count and standard SAR ADC layout guidance.
Estimated: at 400 kSPS continuous conversion with +5 V supply, the AD7899 draws approximately 50-60 mW total. Ensure that the +5 V rail stays inside ±5% tolerance (4.75 V to 5.25 V) - operation below 4.75 V degrades linearity on the 14-bit output. Use an ADR01 or ADR02 5 V/10 V reference as a separate, low-noise source if the host 5 V is shared with switching logic; the internal 2.5 V reference is not designed to hold ADC linearity under noisy supply glitches.
The ~4 kohm input impedance of the AD7899AR-3's ±10 V input divider forms an RC with the source impedance; for source impedances above ~1 kohm, add an op-amp buffer (e.g., AD8021 or AD8628) directly in front of AIN+ to preserve ADC dynamics. Estimated: input capacitance is approximately 5 pF per ADI input-stage notes; with 4 kohm this gives a -3 dB corner near 8 MHz, well above Nyquist, but lower-frequency settling at the LSB level still demands attention for the kΩ-class transducer source case.
تعمیل کی معلومات
The -REEL suffix in the AD7899 family historically indicated lead-finish and reel packaging; specific RoHS/REACH statements for the AR (legacy) variant are not in the provided data. The lead-free (-Z) variant AD7899ARZ-3REEL is the factory-authorized RoHS drop-in alternative. AEC-Q100 qualification not stated in provided data for this part number.