AD7876BR-REEL - 12-Bit 100kHz SAR ADC, 24-SOIC | Analog Devices
MPN: AD7876BR-REEL ✓ AktifAD7876BR-REEL Ringkasan
An SAR (Successive Approximation Register) ADC is a type of analog-to-digital converter that uses a binary search algorithm and an internal capacitive DAC to convert an analog input voltage into a digital code over a fixed number of clock cycles. The AD7876 belongs to the broader data-converter hierarchy: ADC -> data converter -> signal chain IC -> mixed-signal semiconductor. Built on Analog Devices' LC2MOS process, it integrates the entire signal path from analog input to digital word in a single IC, eliminating the external components required by older discrete ADC designs.
Key features include a 100 kHz throughput rate, 2 microsecond track-and-hold acquisition time, 8 microsecond ADC conversion time, an on-chip buried-Zener reference laser-trimmed for accuracy, and 72 dB signal-to-noise ratio. The device supports bipolar input ranges of +/-5 V or +/-10 V via the AD7876BR (BR suffix) and offers parallel, byte, and serial interface modes for flexible microcontroller or DSP connectivity. Operating from a single +5 V supply, it consumes approximately 70 mW of power.
The AD7876 uses a charge-redistribution switched-capacitor DAC architecture combined with a precision comparator and SAR logic to perform successive approximation. The internal reference and clock eliminate two of the most critical external components in ADC subsystems, reducing board area and improving long-term stability. Dynamic performance is specified for DSP users with SNR and harmonic distortion figures that make it suitable for both DC measurement and AC signal acquisition applications.
Typical applications include industrial process control and data acquisition, motor control feedback loops, instrumentation and test equipment, medical instrumentation signal conditioning, and spectrum analysis front-ends. The wide input range and integrated reference make it well suited for industrial 4-20 mA loop digitization with appropriate signal conditioning.
When designing with this device, decouple the +5 V supply with a 10 uF tantalum and 0.1 uF ceramic capacitor placed close to the supply pin. The analog input drive amplifier must settle within the 2 us acquisition window to avoid conversion errors. For best noise performance, keep digital and analog grounds separated and joined at a single star point near the ADC.
This page synthesizes distributor pricing from 6 sources, drop-in alternatives from the Analog Devices AD787x family and pin-compatible cross-brand parts, and practical design notes not consolidated on any single datasheet or distributor page.
Alternatif penggantian untuk AD7876BR-REEL — paket yang sama, pin-pada-pin kompatibel. Bagian paket yang berbeda memerlukan kerja ulang PCB diabaikan.
Variasi di dalam seri ini
Model-series yang sama yang kompatibel dengan penggantian AD7876BR-REEL (sama faktor bentuk dan footprint) — berbeda di dalam Architecture, On-Chip Reference, Package, Track-and-Hold Acquisition Time.
AD7876BR
✅ Drop-In📋 Alternatif referensi (tidak dalam katalog)
AD7876BR-REEL7
✅ Drop-In📋 Alternatif referensi (tidak dalam katalog)
AD7876CRZ
✅ Drop-In📋 Alternatif referensi (tidak dalam katalog)
AD7876CRZ-REEL7
✅ Drop-In ⚠️ Spesifikasi Tidak Disahkan📋 Alternatif referensi (tidak dalam katalog)
AD7875LPZ-REEL
✅ Drop-InKontak untuk harga
Lihat Datasheet →AD7876BR-REEL Rating Maksimal & Karakteristik Listrik
| Number of Bits | 12 |
| Laju Pengambilan Sampel | 100 kSPS |
| Number of Inputs | 1 |
| Input Type | Single-Ended (bipolar +/-5 V or +/-10 V) |
| Data Interface | Parallel, Byte, Serial |
| Architecture | SAR (Successive Approximation Register) |
| Track-and-Hold Acquisition Time | 2 us |
| ADC Conversion Time | 8 us |
| On-Chip Reference | Yes (laser-trimmed buried Zener) |
| Tegangan Pemuat | +5 V |
| Power Dissipation | 70 mW (typical) |
| Signal-to-Noise Ratio | 72 dB |
| Paket | 24-SOIC (0.295 in / 7.50 mm width) |
| Tipe Mounting | Surface Mount |
| Packaging | Tape & Reel (REEL suffix) |
| Status RoHS | Compliant |
Konfigurasi Pin AD7876BR-REEL
| Pin produk 1 | VREF — Reference voltage output (decoupling) |
| Pin produk 2 | AGND — Analog ground |
| Pin produk 3 | AIN — Analog input |
| Pin produk 4 | R1 — Input range scaling resistor pin 1 |
| Pin produk 5 | R2 — Input range scaling resistor pin 2 |
| Pin produk 6 | REF IN — Reference input (decoupling) |
| Pin produk 7 | VDD — +5 V supply |
| Pin produk 8 | DGND — Digital ground |
| Pin produk 9 | CLK — Clock input |
| Pin produk 10 | CONVST — Conversion start (active low) |
| Pin produk 11 | BUSY — Busy output (active high during conversion) |
| Pin produk 12 | CS — Chip select (active low) |
| Pin produk 13 | RD — Read input (active low) |
| Pin produk 14 | DB11 — Data output bit 11 (MSB) |
| Pin produk 15 | DB10 — Data output bit 10 |
| Pin produk 16 | DB9 — Data output bit 9 |
| Pin produk 17 | DB8 — Data output bit 8 |
| Pin produk 18 | DB7 — Data output bit 7 |
| Pin produk 19 | DB6 — Data output bit 6 |
| Pin produk 20 | DB5 — Data output bit 5 |
| Pin produk 21 | DB4 — Data output bit 4 |
| Pin produk 22 | DB3 — Data output bit 3 |
| Pin produk 23 | DB2 — Data output bit 2 |
| Pin produk 24 | DB1 — Data output bit 1 (LSB) |
Aplikasi Umum
AD7876BR-REEL cocok untuk 7 aplikasis: Industrial Process Control Data Acquisition, Motor Control Feedback Loops, Instrumentation and Test Equipment, Medical Instrumentation Signal Acquisition, Spectrum Analysis and DSP Front-End, Audio and Communication Signal Conditioning, Battery Monitoring and Power Management.
Industrial Process Control Data Acquisition
The AD7876BR-REEL's 12-bit resolution and 100 kSPS throughput suit it for industrial process control loops where sensor signals must be digitized at high speed. The +/-10 V bipolar input range via the BR scaling network accepts 4-20 mA loop signals after a sense resistor, while the 72 dB SNR preserves measurement accuracy for closed-loop control. The on-chip laser-trimmed reference eliminates drift concerns in 24/7 plant operation.
Direkomendasikan
Motor Control Feedback Loops
Brushless DC and AC servo motor controllers need fast, accurate phase current and position feedback digitization. The AD7876BR-REEL's 2 us track-and-hold and 100 kSPS rate allow current-sense amplifier outputs to be sampled synchronously with PWM switching. The parallel interface provides the low-latency data transfer required for field-oriented control (FOC) algorithms running on DSPs and microcontrollers.
Direkomendasikan
Instrumentation and Test Equipment
Digital multimeters, oscilloscope front-ends, and bench-top data loggers benefit from the AD7876BR-REEL's integrated architecture and flexible interface. The on-chip reference simplifies calibration, while the parallel/byte/serial interface selection accommodates legacy microcontroller displays and modern DSP back-ends. The 12-bit accuracy is sufficient for general-purpose measurement; for higher precision, the AD786x 14-bit family is recommended.
Direkomendasikan
Medical Instrumentation Signal Acquisition
Patient monitoring and diagnostic equipment digitize low-frequency biosignals at moderate sample rates. The AD7876BR-REEL's 100 kSPS is overkill for ECG (typically 500 Hz) but useful for high-bandwidth modalities like ultrasound pre-beamforming and evoked-potential capture. The integrated reference and small SOIC footprint simplify the compact PCB layouts required for portable medical devices.
Direkomendasikan
Spectrum Analysis and DSP Front-End
Wideband spectrum analyzers and software-defined radio front-ends digitize IF signals at high sample rates for FFT processing. The AD7870 and AD7875 are the AD7876 family members specifically specified for dynamic performance (SNR, harmonic distortion, intermodulation distortion) required by DSP users. The AD7876BR-REEL can serve these applications when dynamic specs are not the primary concern, such as in calibration or telemetry channels.
Direkomendasikan
Audio and Communication Signal Conditioning
Audio mixing consoles, communications receivers, and base-band signal processors use moderate-resolution ADCs in the audio band. The AD7876BR-REEL's 72 dB SNR provides sufficient dynamic range for voice-band digitization, and its parallel interface can stream samples directly into a DSP for real-time filtering. While not a high-fidelity audio ADC, it is well suited for industrial audio and intercom systems where cost is paramount.
Direkomendasikan
Battery Monitoring and Power Management
Battery management systems in UPS, telecom, and electric-vehicle applications monitor cell voltages, pack current, and temperature. The AD7876BR-REEL's +/-10 V input range accepts voltages from multi-cell battery stacks via simple resistor dividers, and the 100 kSPS rate enables simultaneous monitoring of multiple cells through an external multiplexer. The low 70 mW power consumption from a single +5 V rail suits thermally-constrained battery packs.
Direkomendasikan
Ringkasan Produk Direkomendasikan
Data referensi engineering untuk AD7876BR-REEL — pembandingan, panduan desain, dan informasi konformitas.
Panduan Pemilihan
Pembandingan dengan Alternatif
| Parameter Umum | Produk Ini | AD7876BR | AD7876BR-REEL7 | AD7876CRZ | AD7876CRZ-REEL7 | AD7875LPZ-REEL |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 24-SOIC wide (7.50 mm) | 24-SOIC wide - same | 24-SOIC wide - same | 24-SOIC wide - same | 24-SOIC wide - same | 24-LCCC variant |
| Resolution | 12-bit | 12-bit | 12-bit | 12-bit | 12-bit | 12-bit |
| Sampling Rate | 100 kSPS | 100 kSPS | 100 kSPS | 100 kSPS | 100 kSPS | 100 kSPS |
| Input Range (Bipolar) | +/-5 V or +/-10 V (BR scaling) | +/-5 V or +/-10 V (BR scaling) | +/-5 V or +/-10 V (BR scaling) | Commercial grade scaling (differs from BR) | Commercial grade scaling (differs from BR) | AD7875 family bipolar scaling |
| On-Chip Reference | Yes (laser-trimmed) | Yes | Yes | Yes | Yes | Yes |
| Data Interface | Parallel/Byte/Serial | Parallel/Byte/Serial | Parallel/Byte/Serial | Parallel/Byte/Serial | Parallel/Byte/Serial | Parallel/Byte/Serial |
| Packaging Form | Tape & Reel (13-inch) | Tube | Tape & Reel (7-inch) | Tube | Tape & Reel (7-inch) | Tape & Reel |
Diferensiator Kunci
- Same family SOIC-24 footprint enables BOM flexibility (vsAD7876BR)
- Standard 13-inch reel for high-volume manufacturing (vsAD7876BR-REEL7)
- BR-suffix bipolar input range scaling (vsAD7876CRZ)
Catatan Desain
Estimated: Decouple the AD7876BR-REEL's +5 V supply with a 10 uF tantalum bulk capacitor and a 0.1 uF ceramic capacitor placed within 5 mm of the VDD pin. The ADC draws approximately 14 mA (70 mW / 5 V) plus transient currents during conversion; poor decoupling causes reference noise that couples into the conversion result. For best performance, use a linear regulator for the analog supply rather than a switching converter.
Keep analog and digital grounds separated on the PCB and join them at a single star-point near the ADC's AGND pin. The wide-body SOIC package provides adequate thermal dissipation at 70 mW, but the exposed lead frame should be soldered to a ground pour for both thermal and EMI reasons. Route digital outputs (DB1-DB11) away from the analog input traces to minimize digital-to-analog crosstalk.
The drive amplifier at the AIN pin must settle to 12-bit accuracy within the 2 us acquisition window. An op-amp with insufficient slew rate or bandwidth causes gain errors and noise pickup. Verify that the input amplifier's settling time is at least 4x faster than the acquisition window. Also note that the BR-suffix scaling resistors set the +/-5 V or +/-10 V range; omitting them or selecting wrong values causes input-range errors. Reference warmup time after power-on is required before accurate conversions.
Informasi Konformitas
RoHS compliant per Analog Devices product page. REACH compliant per manufacturer datasheet. No AEC-Q100 automotive qualification - choose AD7862AR-10REEL7 automotive variant for vehicle applications. Halogen-free per manufacturer datasheet.
