ADS8406IPFBRG4 - 16-Bit 1.25MSPS SAR ADC | Texas Instruments
N.º de pieza: ADS8406IPFBRG4 ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $18.5 | $18,50 |
| 10 | $16.62 | $166,20 |
| 100 | $14.78 | $1.478,00 |
| 500 | $13.35 | $6.675,00 |
| 1.000 | $11.92 | $11.920,00 |
ADS8406IPFBRG4 Descripción general
An SAR ADC is a type of analog-to-digital converter that uses a binary search algorithm through an internal capacitor-based digital-to-analog converter to compare the sampled input against successive reference-weighted levels, settling to a digital output in N conversion cycles for N bits of resolution. SAR ADCs sit within the broader ADC taxonomy alongside delta-sigma, pipeline, and flash converters, and are valued for low latency, deterministic behavior, and excellent DC accuracy without the latency penalty of oversampling converters.
Key features of the ADS8406IPFBRG4 include 1.25 MHz sample rate, a fully differential analog input that accepts pseudo-bipolar input ranges, an internal low-drift 4.096 V reference, and a wide 2.95 V to 5.25 V analog supply range with a separate digital I/O supply. The device supports both 16-bit parallel output and an 8-bit bus option using two read cycles, simplifying connection to 8-bit microcontrollers and 16-bit DSPs alike. Typical power dissipation is approximately 155 mW at 1.25 MSPS, and the part is specified over the -40 C to +85 C industrial temperature range.
Typical applications include industrial process control, optical networking power monitoring, multi-channel data acquisition systems, medical instrumentation front-ends, and high-speed closed-loop control. The combination of high linearity, internal reference, and parallel interface makes the ADS8406 a strong fit for systems that demand deterministic throughput and DC accuracy rather than high channel density.
When designing with the ADS8406IPFBRG4, decouple AVD and DVDD with separate 1 uF and 100 nF ceramic capacitors placed as close as possible to the supply pins, and use a ground plane to control digital return currents. Drive the analog input with a low-impedance, low-distortion amplifier such as the THS4031 or OPA227 to preserve the converter's linearity at the rated sample rate. Observe the t_acq acquisition-time and t_conv conversion-time timing budgets in the timing diagram to avoid degraded SNR at full throughput.
Alternativas directas para ADS8406IPFBRG4 — 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 ADS8406IPFBRG4 (mismo factor de forma y huella) — difiere en Package, Input Type, Resolution, Sample Rate, Conversion Time.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
ADS8406IPFBTG4
✅ Sustitución directa✓ En stock
$14.2 / unidad
Ver hoja de datos →ADS8402IPFBR
✅ Sustitución directa✓ En stock
$10.43 / unidad
Ver hoja de datos →ADS8401IPFBRG4
✅ Sustitución directa ⚠️ Especificaciones sin verificar✓ En stock
$11.75 / unidad
Ver hoja de datos →ADS8412IBPFBRG4
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ADS8383IPFBRG4
✅ Sustitución directa ⚠️ Especificaciones sin verificar✓ En stock
$11.95 / unidad
Ver hoja de datos →ADS8406IPFBRG4 Valores máximos y características eléctricas
| Resolución | 16 bit |
| Sample Rate | 1.25 MSPS |
| Architecture | SAR (Successive Approximation Register) |
| Number of Inputs | 1 |
| Input Type | Pseudo-bipolar, fully differential |
| Integral Non-Linearity (INL) | 0.0031% (typ) |
| Conversion Time | 650 ns (max) |
| Internal Reference | 4.096 V |
| Analog Supply Voltage (AVDD) | 2.95 V to 5.25 V |
| Digital I/O Supply (DVDD) | 2.7 V to 5.25 V |
| Power Dissipation | 155 mW at 1.25 MSPS |
| Output Interface | Parallel, 16-bit or 8-bit (two read cycles) |
| Rango de temperatura de funcionamiento | -40 C to +85 C |
| Encapsulado | 48-pin TQFP (PFB) 7x7 mm |
| Tipo de montaje | Surface Mount |
| Estado RoHS | Compliant |
Configuración de pines de ADS8406IPFBRG4
| Pin 1 | AVDD — Analog supply (2.95 V to 5.25 V) |
| Pin 2 | REF — 4.096 V reference output / input |
| Pin 3 | GND — Analog ground |
| Pin 4 | IN+ — Differential positive analog input |
| Pin 5 | IN- — Differential negative analog input |
| Pin 6 | GND — Analog ground |
| Pin 7 | AVDD — Analog supply |
| Pin 8 | AVDD — Analog supply |
| Pin 9 | GND — Analog ground |
| Pin 10 | BYTE — Parallel mode select (16-bit / 8-bit) |
| Pin 11 | D15 — Parallel data output bit 15 (MSB) |
| Pin 12 | D14 — Parallel data output bit 14 |
| Pin 13 | D13 — Parallel data output bit 13 |
| Pin 14 | D12 — Parallel data output bit 12 |
| Pin 15 | D11 — Parallel data output bit 11 |
| Pin 16 | D10 — Parallel data output bit 10 |
| Pin 17 | D9 — Parallel data output bit 9 |
| Pin 18 | D8 — Parallel data output bit 8 |
| Pin 19 | DVDD — Digital I/O supply (2.7 V to 5.25 V) |
| Pin 20 | DGND — Digital ground |
| Pin 21 | D7 — Parallel data output bit 7 |
| Pin 22 | D6 — Parallel data output bit 6 |
| Pin 23 | D5 — Parallel data output bit 5 |
| Pin 24 | D4 — Parallel data output bit 4 |
| Pin 25 | D3 — Parallel data output bit 3 |
| Pin 26 | D2 — Parallel data output bit 2 |
| Pin 27 | D1 — Parallel data output bit 1 |
| Pin 28 | D0 — Parallel data output bit 0 (LSB) |
| Pin 29 | DGND — Digital ground |
| Pin 30 | DVDD — Digital I/O supply |
| Pin 31 | RANGE — Input range select |
| Pin 32 | GND — Ground |
| Pin 33 | CS — Chip select (active low) |
| Pin 34 | RD — Read input (active low) |
| Pin 35 | BUSY — Conversion in progress (active high) |
| Pin 36 | CONVST — Conversion start input |
| Pin 37 | RESET — Reset input (active low) |
| Pin 38 | GND — Ground |
| Pin 39 | NC — Not connected |
| Pin 40 | NC — Not connected |
| Pin 41 | NC — Not connected |
| Pin 42 | GND — Ground |
| Pin 43 | AVDD — Analog supply |
| Pin 44 | GND — Analog ground |
| Pin 45 | REFGND — Reference ground |
| Pin 46 | REF — 4.096 V reference |
| Pin 47 | AVDD — Analog supply |
| Pin 48 | AVDD — Analog supply |
Aplicaciones típicas
ADS8406IPFBRG4 es adecuado para 6 aplicacións: Industrial Process Control Data Acquisition, Optical Power Monitoring, Medical Instrumentation Front-End, Multi-Channel Data Acquisition Systems, High-Speed Closed-Loop Control, Test and Measurement Instrumentation.
Industrial Process Control Data Acquisition
The ADS8406IPFBRG4 fits industrial process control because its 16-bit resolution, 0.0031% INL, and 1.25 MSPS throughput digitize thermocouple, RTD, and 4-20 mA conditioned signals with high DC accuracy. Its pseudo-bipolar fully differential input accepts signals that swing around a non-zero common-mode voltage, which is typical of current-shunt and bridge-sensor front-ends on a factory floor. The parallel interface simplifies connection to a host PLC CPU or DSP, and the -40 C to +85 C industrial temperature range covers cabinet-mounted equipment.
Recomendado
Optical Power Monitoring
The ADS8406IPFBRG4 suits optical power monitoring in DWDM and EDFA systems because its 1.25 MSPS throughput tracks photodiode current transients faster than audio-band converters, while its 16-bit dynamic range resolves milliamp-level tap currents. The fully differential input rejects ground noise from switching power supplies in the line card, and the parallel 16-bit output feeds an FPGA for AGC and alarm decisions. The internal 4.096 V reference eliminates a separate reference IC, reducing BOM count on dense line cards.
Recomendado
Medical Instrumentation Front-End
The ADS8406IPFBRG4 supports medical instrumentation such as patient monitoring, ECG, and EEG acquisition modules where 16-bit resolution, 0.0031% INL, and 1.25 MSPS sample rate deliver diagnostic-grade accuracy. The pseudo-bipolar fully differential input rejects common-mode interference from power-line and CRT deflection noise, critical for low-amplitude bioelectric signals. The parallel interface simplifies connection to a host DSP that performs digital filtering, and the industrial temperature range covers portable and clinical-grade equipment.
Recomendado
Multi-Channel Data Acquisition Systems
The ADS8406IPFBRG4 fits multi-channel data acquisition modules where its 1.25 MSPS throughput and deterministic SAR latency allow fast channel-to-channel settling through an external multiplexer. The 16-bit resolution and 0.0031% INL provide DC accuracy for industrial vibration, acoustic, and strain-gage measurements. The parallel interface and 8-bit read mode ease connection to 8-bit MCUs and 16-bit DSPs, and the internal 4.096 V reference simplifies the analog supply chain across multiple channels on the same PCB.
Recomendado
High-Speed Closed-Loop Control
The ADS8406IPFBRG4 enables high-speed closed-loop control in motor drives, valve positioning, and servo systems where the SAR architecture's deterministic single-cycle conversion produces consistent loop delays at 1.25 MSPS. The 16-bit resolution and 0.0031% INL provide the feedback precision required for current-mode and torque-control loops, while the fully differential input rejects switching noise from the inverter stage. Parallel 16-bit output to an FPGA or DSP enables sub-microsecond loop execution.
Recomendado
Test and Measurement Instrumentation
The ADS8406IPFBRG4 serves test and measurement instruments such as digital multimeters, oscilloscope front-ends, and bench-top data loggers where 16-bit resolution, 1.25 MSPS throughput, and 0.0031% INL support accurate waveform capture and DC measurement. The pseudo-bipolar fully differential input accepts voltage and current waveforms that swing around a non-zero common-mode level, common in differential probe and shunt measurements. The internal 4.096 V reference and parallel interface simplify integration with bench-instrument signal-processing blocks.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para ADS8406IPFBRG4 — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | ADS8406IPFBTG4 | ADS8402IPFBR | ADS8401IPFBRG4 | ADS8412IBPFBRG4 | ADS8383IPFBRG4 |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 48-TQFP (PFB) 7x7 mm | 48-TQFP (PFB) - same | 48-TQFP (PFB) - same | 48-TQFP (PFB) - same | 48-TQFP (PFB) - same | 48-TQFP (PFB) - same |
| Resolution | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit | 18 bit |
| Sample Rate | 1.25 MSPS | 1.25 MSPS | 1.25 MSPS | 1.25 MSPS | 20 MSPS (16x faster, pipelined) | 500 kSPS (-60%) |
| Architecture | SAR | SAR | SAR | SAR | Pipelined | SAR |
| Input Type | Pseudo-bipolar fully differential | Pseudo-bipolar fully differential | Pseudo-bipolar fully differential | Unipolar single-ended | Fully differential | Pseudo-bipolar differential |
| Internal Reference | 4.096 V | 4.096 V | 4.096 V | 2.5 V | Internal | Internal |
| Output Interface | Parallel 16-bit / 8-bit | Parallel 16-bit / 8-bit | Parallel 16-bit / 8-bit | Parallel 16-bit / 8-bit | Parallel 16-bit / 8-bit | Parallel 18-bit / byte |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
| Approx. 1k Price (USD) | 11.92 | Similar (same die) | Similar | Similar | Higher (faster ADC) | Higher (18-bit) |
Diferenciadores clave
- True 16-bit no-missing-code performance with internal 4.096 V reference (frente a ADS8401IPFBRG4)
- Higher sample rate than 18-bit alternative at the same 48-TQFP footprint (frente a ADS8383IPFBRG4)
- SAR architecture for deterministic, low-latency conversion (frente a ADS8412IBPFBRG4)
Notas de diseño
Decouple AVDD and DVDD with separate 1 uF and 100 nF ceramic capacitors placed as close as possible to the supply pins. Use a ferrite bead or small resistor between AVDD and DVDD to isolate analog and digital return currents. The TI datasheet recommends placing the 1 uF bulk capacitor within 5 mm of each AVDD pin and the 100 nF high-frequency bypass within 1-2 mm. Failure to decouple adequately can couple digital switching noise into the analog front-end and degrade SNR at the full 1.25 MSPS rate.
Use a continuous analog ground plane under and around the ADC, and route digital return currents to a separate digital ground that joins the analog ground at a single point near the ADC ground pins. This star-ground technique prevents digital switching transients from corrupting the analog sample-and-hold. Place the input driver amplifier (e.g. THS4031 or OPA227) within 25 mm of the IN+ and IN- pins to minimize input-capacitance-induced settling errors at 1.25 MSPS.
Observe the t_acq acquisition time and t_conv conversion time timing budgets in the datasheet timing diagram to avoid degraded SNR at full throughput. Driving the analog input with a high-impedance source violates the 650 ns acquisition time and can introduce aperture-dependent gain error. Also, do not toggle CS, RD, or CONVST during the conversion window; consult the timing diagram to ensure t_wH and t_wL pulse widths are met. Lastly, leave the BYTE pin tied to DVDD or DGND through a short trace to prevent the parallel mode from drifting mid-read.
Información de cumplimiento
RoHS compliant per TI product page. Not AEC-Q100 qualified (industrial grade). Lead-free (Pb-free) and halogen-free per the -G4 suffix designation.
