AD7690BRMZ - 18-Bit 400kSPS PulSAR ADC | Analog Devices
N.º de pieza: AD7690BRMZ ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $27.5 | $27,50 |
| 10 | $25.3 | $253,00 |
| 100 | $22 | $2.200,00 |
| 500 | $19.8 | $9.900,00 |
| 1.000 | $17.6 | $17.600,00 |
AD7690BRMZ Descripción general
An ADC (analog-to-digital converter) is a device that converts continuous analog signals into discrete digital numbers, enabling digital processing of real-world signals. SAR ADCs use a binary search algorithm to approximate the input voltage, offering a good balance of speed, resolution, and power consumption. The AD7690 belongs to the PulSAR family, known for low power and high precision, and is widely used in data acquisition systems, industrial process control, and medical instrumentation.
Key features of the AD7690BRMZ include 18-bit resolution with no missing codes, a 400 kSPS sampling rate, and a power dissipation that scales linearly with throughput. The differential input range is ±VREF, with VREF ranging from 2.3V to 5.25V, allowing flexible reference configurations. The device also offers a pseudo-differential mode for single-ended applications. The SPI interface supports daisy-chaining, reducing the number of digital lines required in multi-channel systems.
Technically, the AD7690 uses a charge redistribution architecture with a capacitive DAC, achieving excellent linearity and low noise. The internal conversion clock eliminates the need for an external clock, simplifying design. The device operates over a temperature range of -40°C to +125°C, making it suitable for industrial environments. The MSOP-10 package is small, saving board space, and is available in tape and reel for automated assembly.
Typical applications include high-speed data acquisition, industrial process control, medical imaging, and battery-powered instrumentation. The high resolution and speed make it ideal for precision measurement systems where accuracy is critical. The low power consumption, which scales with throughput, is beneficial for portable devices.
When designing with the AD7690BRMZ, ensure a clean, low-impedance reference voltage and adequate decoupling on VDD and VIO. The differential input should be driven with a low-impedance source to maintain accuracy. For best performance, use a precision reference and careful PCB layout to minimize noise.
Alternativas directas para AD7690BRMZ — 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 AD7690BRMZ (mismo factor de forma y huella) — difiere en Architecture, Package, Resolution, RoHS Status, Sampling Rate.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
AD7690BRMZ-RL7
✅ Sustitución directa✓ En stock
$17.6 / unidad
Ver hoja de datos →AD7980BRMZ
✅ Sustitución directa ⚠️ Especificaciones sin verificar✓ En stock
$16.8636 / unidad
Ver hoja de datos →AD7691BRMZ
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
AD7693BRMZ
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
AD7946BRM
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
AD7690BRMZ Valores máximos y características eléctricas
| Resolución | 18 bits |
| Frecuencia de muestreo | 400 kSPS |
| Input Type | Differential |
| Number of Inputs | 1 |
| Architecture | SAR |
| INL (Max) | 1.5 LSB |
| Supply Voltage (VDD) | 5 V |
| Logic Supply (VIO) | 1.8 V to 5 V |
| Reference Voltage (VREF) | 2.3 V to 5.25 V |
| Power Dissipation | 12.5 mW at 400 kSPS |
| Temperatura de funcionamiento | -40°C to +125°C |
| Encapsulado | 10-MSOP |
| Tipo de montaje | Surface Mount |
| Interfaz | SPI, DSP compatible |
| Estado RoHS | Compliant |
Configuración de pines de AD7690BRMZ
| Pin 1 | IN+ — Positive differential input |
| Pin 2 | IN- — Negative differential input |
| Pin 3 | GND — Ground |
| Pin 4 | VREF — Reference voltage input |
| Pin 5 | VDD — Power supply (5V) |
| Pin 6 | VIO — Logic supply (1.8V to 5V) |
| Pin 7 | SDI — Serial data input (for daisy-chain) |
| Pin 8 | SDO — Serial data output |
| Pin 9 | SCK — Serial clock input |
| Pin 10 | CNV — Convert input (start conversion) |
Aplicaciones típicas
AD7690BRMZ es adecuado para 6 aplicacións: High-Speed Data Acquisition, Industrial Process Control, Medical Instrumentation, Battery-Powered Instrumentation, Precision Measurement Systems, Audio Test Equipment.
High-Speed Data Acquisition
The AD7690BRMZ's 400 kSPS sampling rate and 18-bit resolution make it ideal for high-speed data acquisition systems. It accurately captures fast-changing signals with low distortion, enabling precise measurement in applications like vibration analysis and transient recording. The SPI interface simplifies connection to microcontrollers or DSPs, and the differential input rejects common-mode noise, improving signal integrity.
Recomendado
Industrial Process Control
In industrial process control, the AD7690BRMZ provides high accuracy and stability over a wide temperature range (-40°C to +125°C). Its 18-bit resolution ensures precise monitoring of sensors such as pressure, temperature, and flow. The device's low power consumption and small MSOP package make it suitable for distributed control nodes. The SPI interface allows easy integration with industrial microcontrollers, and the differential input helps reject electrical noise common in factory environments.
Recomendado
Medical Instrumentation
The AD7690BRMZ is well-suited for medical instrumentation such as patient monitoring and diagnostic equipment. Its high resolution and low noise are critical for accurate biopotential measurements like ECG and EEG. The 400 kSPS sampling rate supports real-time signal processing, while the small package enables compact device designs. The device's low power consumption is beneficial for battery-powered portable monitors. The SPI interface allows seamless connection to medical-grade microcontrollers.
Recomendado
Battery-Powered Instrumentation
For battery-powered instruments, the AD7690BRMZ offers power scaling with throughput, consuming only 12.5 mW at 400 kSPS and less at lower rates. This makes it ideal for portable data loggers and field instruments. The wide supply voltage range (VDD 5V, VIO 1.8V-5V) allows operation from various battery chemistries. The small MSOP package minimizes board space, and the SPI interface reduces pin count, saving power and size.
Recomendado
Precision Measurement Systems
The AD7690BRMZ excels in precision measurement systems such as digital multimeters and precision scales. Its 18-bit resolution and 1.5 LSB INL ensure accurate readings. The differential input allows direct connection to bridge sensors, rejecting common-mode noise. The internal conversion clock simplifies design, and the SPI interface supports high-speed data transfer to the host processor. The device's stability over temperature ensures consistent performance in varying environments.
Recomendado
Audio Test Equipment
In audio test equipment, the AD7690BRMZ provides high-resolution digitization of audio signals for analysis. Its 18-bit resolution and 400 kSPS sampling rate capture audio frequencies with low distortion. The differential input reduces noise, and the low power consumption is suitable for portable test devices. The SPI interface allows easy integration with DSPs for real-time audio analysis. The device's small package is ideal for compact test instruments.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para AD7690BRMZ — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | AD7690BRMZ-RL7 | AD7980BRMZ | AD7691BRMZ | AD7693BRMZ | AD7946BRM |
|---|---|---|---|---|---|---|
| Package | 10-MSOP | 10-MSOP | 10-MSOP | 10-MSOP | 10-MSOP | 10-MSOP |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 18 bits | 18 bits | 18 bits | 16 bits | 16 bits | 14 bits |
| Sampling Rate | 400 kSPS | 400 kSPS | 400 kSPS | 250 kSPS | 500 kSPS | 250 kSPS |
| Input Type | Differential | Differential | Pseudo-differential | Differential | Differential | Differential |
| INL (Max) | 1.5 LSB | 1.5 LSB | 1.5 LSB | 1.5 LSB | 1.5 LSB | 1.5 LSB |
| Power Dissipation | 12.5 mW | 12.5 mW | 12.5 mW | 8.5 mW | 15 mW | 7.5 mW |
| Reference Voltage Range | 2.3V to 5.25V | 2.3V to 5.25V | 2.3V to 5.25V | 2.3V to 5.25V | 2.3V to 5.25V | 2.3V to 5.25V |
Diferenciadores clave
- Higher resolution than AD7691BRMZ (frente a AD7691BRMZ)
- Higher sampling rate than AD7946BRM (frente a AD7946BRM)
- Differential input vs pseudo-differential in AD7980BRMZ (frente a AD7980BRMZ)
Notas de diseño
Decouple VDD and VIO with 0.1uF and 10uF capacitors placed close to the pins. The VIO supply should be matched to the host logic level to avoid overvoltage. Power consumption scales with throughput, so reduce sampling rate to save power in battery applications.
Use a solid ground plane and separate analog and digital grounds, connecting them at a single point. Keep the reference input (VREF) clean with a low-impedance source and bypass capacitor. Route differential input traces symmetrically to minimize noise pickup.
Ensure the input signal settles within the acquisition time; use a low-impedance driver or buffer. Avoid exceeding the absolute maximum ratings on IN+ and IN-. For daisy-chain operation, ensure proper timing on SDI and CNV. Always consult the datasheet for recommended operating conditions.
Información de cumplimiento
RoHS compliant per Analog Devices product page. Not AEC-Q100 qualified.
