ADS8481IBRGZR - 18-Bit 1MSPS SAR ADC w/Ref | Texas Instruments
N.º de pieza: ADS8481IBRGZR ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $18.5 | $18,50 |
| 10 | $16.85 | $168,50 |
| 100 | $14.95 | $1.495,00 |
| 500 | $13.2 | $6.600,00 |
| 1.000 | $11.75 | $11.750,00 |
ADS8481IBRGZR Descripción general
What is a SAR ADC? A successive-approximation-register analog-to-digital converter is a precision data-acquisition IC that resolves an analog input one bit at a time using a comparator, a DAC, and a binary search register, completing a full conversion in N clock cycles. SAR ADCs sit in the broader hierarchy of precision converters (SAR -> ADC -> data converter -> signal chain IC -> semiconductor), offering the best trade-off of speed, resolution, and power for many industrial and instrumentation applications, since they require no pipeline latency.
Key features of the ADS8481IBRGZR include ±0.6 LSB typical INL/DNL, 87 dB SNR, no missing codes over the full industrial -40 °C to +85 °C range, internal 4.096 V low-drift reference, and a true 18-bit parallel data bus. The wide 1 MSPS sampling rate makes it suitable for high-throughput multichannel systems through external multiplexer switching.
Architecturally, the part uses a charge-redistribution DAC array, an inherent sample-and-hold, and an internal clock. The pseudo-differential input structure simplifies front-end signal conditioning while preserving good common-mode rejection; it also simplifies PCB layout by reducing the number of true differential traces required.
Typical applications include industrial process control, medical instrumentation, vibration analysis, optical encoders, and high-speed data acquisition systems. The part also fits next-generation logic-instrumentation designs where low noise and high DC accuracy are required.
When designing with this device, place the decoupling capacitors (10 µF tantalum + 0.1 µF ceramic) within a few millimeters of the supply pins and provide a solid ground plane under the exposed pad. To preserve 18-bit accuracy, the reference decoupling capacitor and the input common-mode bypass must be low-ESR ceramic parts placed near the relevant pins.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
Alternativas directas para ADS8481IBRGZR — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con ADS8481IBRGZR (mismo factor de forma y huella) — difiere en Package, Architecture, Resolution, Input Type, Data Interface.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
ADS8481IBRGZT
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ADS8481IRGZRG4
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ADS8481IRGZRQ1Q1
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ADS8482IBRGZR
✅ Sustitución directa✓ En stock
$14.45 / unidad
Ver hoja de datos →ADS8472IRGZR
✅ Sustitución directa✓ En stock
$8.5 / unidad
Ver hoja de datos →AD7983BCPZ-R2
✅ Sustitución directa✓ En stock
$6.35 / unidad
Ver hoja de datos →ADS8481IBRGZR Valores máximos y características eléctricas
| Resolución | 18 bits |
| Sample Rate | 1 MSPS |
| Number of Channels | 1 |
| Architecture | SAR (Successive Approximation Register) |
| Input Type | Pseudo-Differential Unipolar Single-Ended |
| Data Interface | Parallel (18-bit, 16-bit, or 8-bit bus modes) |
| Analog Supply Voltage | 4.75 V to 5.25 V |
| Digital I/O Supply | 2.7 V to 5.25 V |
| Internal Reference Voltage | 4.096 V |
| Offset Error | ±0.1 mV (over temperature) |
| INL (Max) | ±1.5 LSB |
| DNL (Max) | ±1 LSB (no missing codes) |
| SNR | 87 dB (typical) |
| Temperatura de funcionamiento | -40 °C to +85 °C |
| Encapsulado | 48-VQFN (RGZ) 7x7 mm with exposed thermal pad |
| Tipo de montaje | Surface Mount |
| Estado RoHS | Compliant |
Guía de configuración de pines de ADS8481IBRGZR 48-vqfn (rgz) 7x7 mm with exposed thermal pad
Configuración de pines para ADS8481IBRGZR (encapsulado 48-vqfn (rgz) 7x7 mm with exposed thermal pad). Este componente analógico presenta pines de entrada, salida y alimentación. Consulte la hoja de datos del fabricante para conocer las configuraciones de los pines de ajuste de offset, compensación y habilitación. Ideal para circuitos de acondicionamiento de señal y amplificadores.
No hay datos detallados de patillaje disponibles para ADS8481IBRGZR.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
ADS8481IBRGZR es adecuado para 6 aplicacións: Industrial Process Control & Data Acquisition, Medical Instrumentation Front-End, Vibration & Condition Monitoring, Optical Encoder & Position Sensing, Portable Test & Measurement, Next-Generation Logic Instrumentation & Bench DMMs.
Industrial Process Control & Data Acquisition
The ADS8481IBRGZR's 18-bit resolution, 1 MSPS throughput, and ±0.1 mV offset error over -40 °C to +85 °C make it well suited to industrial process-control front-ends reading 4-20 mA or ±10 V signals through a front-end instrumentation amp. Its internal 4.096 V reference eliminates the need for a precision external reference, simplifying BOM cost, while the 48-VQFN (RGZ) footprint allows dense multi-channel layouts when paired with external analog multiplexers for 8-/16-channel systems.
Recomendado
Medical Instrumentation Front-End
The ADS8481IBRGZR's 18-bit resolution and 87 dB SNR deliver the dynamic range required by medical instrumentation such as patient-monitoring DSP chains, infusion-pump dosing feedback, and bedside-monitoring analog front ends. The integrated 4.096 V reference reduces analog complexity and PCB area, while the parallel interface minimizes conversion latency in real-time signal-processing loops. Operating from a single +5 V analog supply simplifies medical-grade isolation design.
Recomendado
Vibration & Condition Monitoring
With 1 MSPS sampling and 87 dB SNR, the ADS8481IBRGZR captures the harmonic content of vibration sensors in motor-control and rotating-machinery condition-monitoring applications. The pseudo-differential input pairs cleanly with IEPE piezoelectric accelerometers through a simple bias network, and the 18-bit no-missing-codes performance preserves measurement fidelity for FFT-based spectral analysis across the industrial temperature range.
Recomendado
Optical Encoder & Position Sensing
The ADS8481IBRGZR's 18-bit resolution enables precise absolute-encoder readout in servo drives, CNC machine tools, and robotic position sensors. Its 1 MSPS throughput supports high-velocity tracking, while the parallel bus minimizes read latency for closed-loop control loops. The wide industrial temperature range and ±0.1 mV offset stability keep encoder accuracy consistent across warm-up drift and shop-floor thermal swings.
Recomendado
Portable Test & Measurement
The ADS8481IBRGZR's micropower sampling architecture and internal reference make it a fit for portable test-and-measurement instruments such as handheld oscilloscope daughter-boards, multimeter analog boards, and field-service diagnostics. The 48-VQFN (RGZ, 7x7 mm) footprint allows compact PCB designs, while the parallel interface supports direct connection to an FPGA or DSP for real-time waveform analysis without the latency of a serial ADC.
Recomendado
Next-Generation Logic Instrumentation & Bench DMMs
The ADS8481IBRGZR's 18-bit 1 MSPS performance suits next-generation logic-instrumentation designs where a precision SAR ADC is paired with a host FPGA or microcontroller for digital readouts. The parallel 18/16/8-bit bus modes ease integration with legacy 8-bit microcontrollers and modern 32-bit processors alike, while the exposed thermal pad simplifies thermal management in high-density bench-instrument chassis.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para ADS8481IBRGZR — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | ADS8481IBRGZT | ADS8481IRGZRG4 | ADS8481IRGZRQ1Q1 | ADS8482IBRGZR | ADS8472IRGZR | AD7983BCPZ-R2 |
|---|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices |
| Package | 48-VQFN (RGZ) 7x7 mm | 48-VQFN (RGZ) 7x7 mm - same | 48-VQFN (RGZ) 7x7 mm - same | 48-VQFN (RGZ) 7x7 mm - same | 48-VQFN (RGZ) 7x7 mm - same | 48-VQFN (RGZ) 7x7 mm - same | 48-LFCSP (QFN-class) - same footprint family |
| Resolution | 18 bits | 18 bits | 18 bits | 18 bits | 18 bits | 16 bits | 18 bits |
| Sample Rate | 1 MSPS | 1 MSPS | 1 MSPS | 1 MSPS | 2 MSPS | 1 MSPS | 1 MSPS |
| Channels | 1 (single) | 1 | 1 | 1 | 1 | 2 (dual simultaneous) | 1 |
| Internal Reference | 4.096 V | 4.096 V | 4.096 V | 4.096 V | 4.096 V | External (no internal) | External (no internal) |
| Data Interface | Parallel (18/16/8-bit) | Parallel | Parallel | Parallel | Parallel | Parallel | Serial SPI/QSPI/MICROWIRE |
| Automotive Grade (AEC-Q100) | No (industrial) | No | No | Yes (AEC-Q100) | No | No | No |
Diferenciadores clave
- Internal 4.096 V low-drift reference (frente a AD7983BCPZ-R2)
- Parallel interface supports legacy 8-bit microcontrollers (frente a AD7983BCPZ-R2)
- Automotive grade variant available in same package (frente a ADS8472IRGZR)
- Higher-precision 18-bit resolution in dual-channel footprint class (frente a ADS8472IRGZR)
Notas de diseño
Place a 10 µF tantalum and a 0.1 µF ceramic decoupling capacitor within 5 mm of the analog supply pin (AVDD) and the digital supply pin (DVDD); this keeps the charge-redistribution DAC's high-frequency switching transients away from the input front end. Solder the exposed thermal pad (EP) to a continuous ground plane with at least 8 thermal vias to the inner ground layer - this also reduces ground bounce on the parallel data bus at 1 MSPS. Keep the REF decoupling capacitor (1 µF to 10 µF low-ESR ceramic) within 3 mm of the REFIN/REFOUT pin.
Route the 18-bit parallel data bus (DB0-DB17) as matched-length groups (LSB nibble, MSB nibble, byte-2) so that bus skew stays within the tDLY timing margin at 1 MSPS. Place a ground guard trace between the analog input traces (IN+, IN-) and the digital bus to reduce digital-to-analog crosstalk. Keep the analog input traces short and symmetric - the pseudo-differential input still benefits from matched trace impedance.
Do not exceed the maximum analog supply of 5.25 V or drop below 4.75 V - the internal reference and charge-redistribution DAC are calibrated at 5 V and accuracy degrades outside this range. Avoid switching the BUSY line mid-conversion; the host must wait for the BUSY rising edge before clocking the next CONVST pulse. For high-precision designs, add a software self-calibration cycle at power-up and after any supply-voltage change of more than 2%.
Estimated: at 1 MSPS with an 18-bit bus, the switching-induced digital current on DVDD reaches ~10 mA peak; using a ferrite bead between AVDD and DVDD or a separate LDO for the digital supply reduces digital-to-analog noise coupling. Place a small RC snubber (10 Ω + 100 pF) on the CONVST pin at the source if long CONVST traces cause ringing into the SAR comparator.
Información de cumplimiento
RoHS compliant per TI product page; the ADS8481IBRGZR is industrial (-40 °C to +85 °C), not automotive qualified. For AEC-Q100 applications use the ADS8481IRGZRQ1Q1 which is pin-compatible. REACH and conflict-minerals statements available on TI's compliance portal.
