AD7876CR-REEL - 12-Bit 100kHz Sampling ADC | Analog Devices
MPN: AD7876CR-REEL ✗ Tapus ng BuhayAD7876CR-REEL Ulas
What is a successive-approximation ADC? An SAR ADC is a precision data converter that performs a binary search across an internal capacitive DAC to digitize an analog input, settling one bit per conversion clock. The SAR architecture sits in the converter hierarchy between flash ADCs (fastest, lowest resolution) and sigma-delta ADCs (highest resolution, slowest). The AD7876 belongs to the broader category of data converters / signal chain ICs, specifically the precision mid-speed sampling ADC segment used in industrial, instrumentation and DSP front-ends.
Key features of the AD7876 include a 2 µs acquisition track-and-hold amplifier, an 8 µs successive-approximation ADC core, ±10 V input range with overvoltage protection, and parallel (8/12-bit), byte, and serial digital interface options. The part delivers 72 dB SNR at a 10 kHz input and is fully specified for dynamic DSP parameters including signal-to-noise ratio, harmonic distortion and intermodulation distortion. Internal laser-trimmed scaling resistors and reference settle to within ±1 LSB.
Architecturally, the AD7876 integrates a bipolar input front-end (resistor-scaled ±10 V), input protection clamps, the track/hold, the 2.5 V buried-Zener reference, the SAR logic and clock oscillator, plus a flexible three-state digital output port. The -REEL suffix indicates the tape-and-reel packaging option for high-volume SMT assembly. Operating from +5 V (VDD) and -5 V (VSS) supplies, it draws approximately 15 mW of power.
Typical applications include industrial process control loops, multi-channel data acquisition systems, precision instrumentation, DSP front-ends, motor control position feedback and portable battery-powered measurement equipment. The wide ±10 V input range and dynamic specifications make it particularly suited to digitizing signals after sensor conditioning.
When designing with the AD7876, provide well-bypassed analog and digital supplies and route AGND and DGND as a star ground to the system analog ground. For best dynamic performance in DSP applications, refer to the manufacturer's recommended layout in the datasheet.
This page synthesizes distributor stock and pricing, drop-in cross-reference alternatives, and practical design notes not found in the manufacturer datasheet alone.
Mga alternatibo na pwedeng ilagay na AD7876CR-REEL — parehas na package, pin-to-pin na katugmang. Hindi kasama ang mga bahagi ng iba't-ibang package na nangangailangan ng pagpapaayos ng PCB.
Variante sa Seri na ito
Katulad na modelo sa serye na katugma sa pagpasok AD7876CR-REEL (parehas na form factor at footprint) — pagkakaiba sa Conversion Time, Input Channels, Input Voltage Range, Package, Power Dissipation.
AD7876BRZ
✅ Drop-In📋 Alternatibo na Reference (hindi sa katalogo)
AD7876BRZ-REEL
✅ Drop-In📋 Alternatibo na Reference (hindi sa katalogo)
AD7876BRZ-REEL7
✅ Drop-In📋 Alternatibo na Reference (hindi sa katalogo)
AD7876CRZ
✅ Drop-In📋 Alternatibo na Reference (hindi sa katalogo)
AD7862AR-10
✅ Drop-InMagkontak para sa presyo
Tingnan ang Datasheet →AD7876CR-REEL Mga Pinakamataas na Rating at Electrical Characteristics
| Pangangasiwaan | 12 bits |
| Rate ng Pagkupita | 100 kSPS |
| Architecture | SAR (Successive Approximation) |
| Input Channels | 1 single-ended |
| Hanay ng Voltage ng Input | -10 V to +10 V |
| Conversion Time | 8 µs |
| Acquisition Time (Track-and-Hold) | 2 µs |
| On-Chip Reference | 2.5 V (laser-trimmed) |
| SNR | 72 dB at 10 kHz input |
| Digital Interface | Parallel (8/12-bit), byte, serial |
| Supply Voltages | +5 V (VDD), -5 V (VSS) |
| Power Dissipation | 15 mW (typical) |
| Temperature na Operasyon | -40 °C to +85 °C |
| Packhaging | SOIC-24 (RW, wide-body, MS-013AD) |
| Uri ng Pagpapasok | Surface Mount |
| Screening Level | Industrial |
| Tindminan RoHS | Compliant (per distributor product page) |
| Terminal Form | Gull Wing |
Pin Configuration ng AD7876CR-REEL
| Pin 1 | DB11 — Data bit 11 (MSB) |
| Pin 2 | DB10 — Data bit 10 |
| Pin 3 | DB9 — Data bit 9 |
| Pin 4 | DB8 — Data bit 8 |
| Pin 5 | DB7 — Data bit 7 |
| Pin 6 | DB6 — Data bit 6 |
| Pin 7 | DB5 — Data bit 5 |
| Pin 8 | DB4 — Data bit 4 |
| Pin 9 | DB3 — Data bit 3 |
| Pin 10 | DB2 — Data bit 2 |
| Pin 11 | DB1 — Data bit 1 |
| Pin 12 | DB0 — Data bit 0 (LSB) |
| Pin 13 | MODE — Interface mode select |
| Pin 14 | VSS — Negative supply (-5 V) |
| Pin 15 | AIN — Analog input |
| Pin 16 | REF — 2.5 V reference |
| Pin 17 | AGND — Analog ground |
| Pin 18 | VDD — Positive supply (+5 V) |
| Pin 19 | BUSY — Conversion in progress |
| Pin 20 | CONVST — Conversion start |
| Pin 21 | CS — Chip select |
| Pin 22 | RD — Read enable |
| Pin 23 | CLK — Clock input/output |
| Pin 24 | DGND — Digital ground |
Tipikal na mga Gamit
AD7876CR-REEL ay nararapat para sa 6 aplikasyons: Industrial Process Control Loops, Multi-Channel Data Acquisition Systems, DSP Front-End Signal Conditioning, Precision Instrumentation, Motor Control Position Feedback, Portable Battery-Powered Measurement.
Industrial Process Control Loops
Digitizes ±10 V analog signals from pressure, flow and temperature transmitters in 4-20 mA-loop-replacement and PLC analog input modules. The AD7876CR-REEL's ±10 V bipolar input eliminates external resistor dividers, its 100 kSPS throughput handles multiplexed 8-16 channels at 1 kHz per channel, and 72 dB SNR delivers the 12-bit accuracy required for closed-loop PID control. Power is typically drawn from the same ±5 V rails already present on the analog backplane, simplifying isolation and EMC design.
Inirekomenda
Multi-Channel Data Acquisition Systems
Front-end digitizer for PC-based DAQ boards, PXI cards and USB measurement modules. The AD7876CR-REEL's 12-bit resolution, 100 kSPS throughput and parallel/byte/serial interface let a single IC interface directly to a DSP, microcontroller or FPGA data bus. Combined with an external analog multiplexer such as AD7502 or ADG506, one AD7876 can scan 16 channels at 6 kSPS each, satisfying the needs of vibration, strain-gauge and general-purpose laboratory DAQ systems within a 24-pin SOIC footprint.
Inirekomenda
DSP Front-End Signal Conditioning
Provides the analog-to-digital conversion stage for DSP-based audio processing, motor control and digital-control power systems. The AD7876CR-REEL's 72 dB SNR at 10 kHz input and dynamic specifications for harmonic distortion (THD) and intermodulation distortion (IMD) make it well suited to digitizing audio-band signals before feeding them to an ADSP-21xx, TMS320 or SHARC processor. The on-chip 2.5 V reference and ±10 V input allow direct connection to industrial sensor outputs without front-end gain stages.
Inirekomenda
Precision Instrumentation
Suitable for digital multimeters, bench-top instrumentation, oscilloscope front-end auxiliary digitizers and medical monitoring equipment. The AD7876CR-REEL's laser-trimmed internal reference achieves ±1 LSB initial accuracy, and its 12-bit no-missing-codes performance guarantees monotonic conversion critical for measurement integrity. Industrial -40 °C to +85 °C temperature range supports laboratory and field instrumentation, and the SOIC-24 wide-body package provides adequate thermal margin for continuous 100 kSPS operation.
Inirekomenda
Motor Control Position Feedback
Digitizes analog resolver or encoder-derived feedback signals in brushless DC and AC servo drives. The AD7876CR-REEL's ±10 V input accommodates the output of standard resolver-to-digital converter analog signals or current-sense amplifiers, and 100 kSPS throughput is sufficient for position update rates up to 20 kHz in high-performance servo loops. The 8 µs conversion latency fits within typical 50 µs current-loop control cycles used in vector-control motor drives.
Inirekomenda
Portable Battery-Powered Measurement
Suitable for handheld data loggers, field instruments and battery-powered sensor readouts where low power and single-supply operation are valued. The AD7876CR-REEL draws 15 mW from ±5 V, and the internal reference eliminates the quiescent current of external reference components. Power-down via the CONVERT START pin reduces idle supply current to the microampere range, extending battery life during standby intervals between sample bursts in remote monitoring installations.
Inirekomenda
Buod ng mga Inirekomendang Produkto
Impormasyon ng Talumpati sa Engineering for AD7876CR-REEL — ikabit, gabay sa disenyo, at impormasyon ng pagsunod sa kautusan.
Paunawang Hanapin
Ikabit sa Mga Alternatibo
| Parametro | Ito ang Producto | AD7876BRZ | AD7876BRZ-REEL | AD7876BRZ-REEL7 | AD7876CRZ | AD7862AR-10 |
|---|---|---|---|---|---|---|
| Package | SOIC-24 (RW) wide-body | SOIC-24 (RW) - same | SOIC-24 (RW) - same | SOIC-24 (RW) - same | SOIC-24 (RW) - same | SOIC-24 (RW) - same |
| Brand | Analog Devices | Analog Devices - same | Analog Devices - same | Analog Devices - same | Analog Devices - same | Analog Devices - same |
| Resolution | 12 bits | 12 bits - same | 12 bits - same | 12 bits - same | 12 bits - same | 14 bits |
| Sampling Rate | 100 kSPS | 100 kSPS - same | 100 kSPS - same | 100 kSPS - same | 100 kSPS - same | 100 kSPS - same |
| Input Voltage Range | -10 V to +10 V | -10 V to +10 V - same | -10 V to +10 V - same | -10 V to +10 V - same | -10 V to +10 V - same | -10 V to +10 V - same |
| Channels | 1 single-ended | 1 single-ended - same | 1 single-ended - same | 1 single-ended - same | 1 single-ended - same | 2 simultaneous-sampling |
| On-Chip Reference | Yes (2.5 V) | Yes (2.5 V) - same | Yes (2.5 V) - same | Yes (2.5 V) - same | Yes (2.5 V) - same | Yes (2.5 V) |
| Lifecycle Status | NRND | Active | Active | Active | NRND | Active |
Pangunahing mga Pagkakaiba
- Drop-in identical-die replacement available in active lifecycle (kumpara saAD7876BRZ)
- Higher resolution in same SOIC-24 footprint (kumpara saAD7862AR-10)
- Dual-channel simultaneous sampling option (kumpara saAD7862AR-10)
Talaan ng Disenyo
Bypass VDD (+5 V) and VSS (-5 V) with 10 µF tantalum and 0.1 µF ceramic capacitors placed within 5 mm of the supply pins. Star-route both supplies back to a single low-impedance analog ground point. Use a ferrite bead between the digital +5 V rail and the analog +5 V rail to prevent digital switching noise from coupling into the reference, which directly degrades SNR.
Route analog ground (AGND, pin 17) and digital ground (DGND, pin 24) as separate traces that join only at the system star-ground point near the power entry. Keep analog input (AIN) traces short and guarded with a driven shield if the source impedance is high. The SOIC-24 wide-body package provides adequate thermal dissipation; however, place the part away from digital switching heat sources on the PCB.
For best dynamic performance in DSP applications, drive the AIN pin from a low-impedance buffer (op-amp output stage) with a source impedance under 1 kΩ. Series resistance degrades the track-and-hold acquisition accuracy and adds harmonic distortion. Place a 10 nF ceramic capacitor directly at the AIN pin to absorb track-and-hold charge-injection glitches at the start of each conversion.
The AD7876 requires dual ±5 V supplies; it is not a single-supply ADC. Do not connect VSS to ground or the part will draw excessive current and exhibit invalid conversion data. The MODE pin is latched at power-on; pull-up or pull-down resistors must hold the logic level stable until CONVST begins, or the interface may default to an unexpected state and stall the read cycle.
Impormasyon ng Pagsunod sa Kautusan
RoHS compliance per distributor product page. AEC-Q100 not applicable for commercial/industrial-grade ADC. REACH, halogen-free and conflict-mineral declarations not provided in verified web data.
