AD7694BCPZ - 16-Bit 250kSPS PulSAR ADC | Analog Devices
Référence : AD7694BCPZ ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $8.5 | $8,50 |
| 10 | $7.8 | $78,00 |
| 100 | $6.9 | $690,00 |
| 500 | $6.2 | $3 100,00 |
| 1 000 | $5.6 | $5 600,00 |
AD7694BCPZ Présentation
An ADC (analog-to-digital converter) is an electronic component that converts continuous analog signals into discrete digital numbers, enabling digital processing of real-world signals. The AD7694 is a successive approximation register (SAR) ADC, which uses a binary search algorithm to determine the digital output. SAR ADCs are known for their high speed, low power, and excellent accuracy, making them ideal for applications such as industrial process control, medical instrumentation, and portable battery-powered devices. The AD7694 sits within the hierarchy: ADC -> SAR ADC -> PulSAR ADC -> precision ADC -> data acquisition system.
Key features of the AD7694BCPZ include 16-bit resolution with no missing codes (B grade), a maximum sampling rate of 250 kSPS, and a typical power dissipation of only 4.5 mW at 5 V supply. The device offers a true differential analog input with a peak-to-peak voltage range of ±VREF, and an SPI-compatible serial interface that operates at clock speeds up to 50 MHz. The internal conversion clock eliminates the need for an external clock, simplifying system design. The device also includes a busy indicator and a power-down mode to reduce power consumption between conversions.
Technically, the AD7694 uses a charge redistribution architecture with a capacitive DAC, achieving excellent linearity and low noise. The B grade ensures no missing codes, guaranteeing monotonicity over the full temperature range. The device operates over a temperature range of -40°C to +85°C, making it suitable for industrial environments. The LFCSP package provides a small footprint (3 mm x 3 mm) with an exposed pad for improved thermal performance.
Typical applications include battery-powered instrumentation, portable medical devices, data acquisition systems, and industrial process control. The low power consumption and small package make it ideal for space-constrained designs. The SPI interface allows easy connection to microcontrollers and DSPs.
When designing with the AD7694, ensure that the reference voltage (VREF) is stable and well-decoupled, as it directly affects conversion accuracy. The analog input should be driven by a low-impedance source to avoid sampling errors. The device requires a 10 µF decoupling capacitor on VDD and a 1 µF capacitor on VREF for optimal performance.
Alternatives de remplacement direct pour AD7694BCPZ — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
AD7694BCPZRL7
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
AD7694BCPZ Valeurs maximales et caractéristiques électriques
| Résolution | 16 bits |
| Fréquence d'échantillonnage | 250 kSPS |
| Input Type | Differential |
| Plage de tension d'entrée | ±VREF |
| Supply Voltage (VDD) | 2.7 V to 5.25 V |
| Reference Voltage (VREF) | 2.3 V to VDD |
| Power Dissipation | 4.5 mW typical at 5 V |
| Interface | SPI-compatible serial |
| Internal Clock | Yes |
| No Missing Codes | Yes (B grade) |
| Plage de température de fonctionnement | -40°C to +85°C |
| Boîtier | 10-lead LFCSP (CP-10-2) |
| Type de montage | Surface Mount |
| Statut RoHS | Compliant |
| Niveau MSL | 3 |
Configuration des broches de AD7694BCPZ
| Broche 1 | IN+ — Positive analog input |
| Broche 2 | IN- — Negative analog input |
| Broche 3 | GND — Ground |
| Broche 4 | VREF — Reference voltage input |
| Broche 5 | VDD — Power supply |
| Broche 6 | SDI — Serial data input (for daisy-chain) |
| Broche 7 | SDO — Serial data output |
| Broche 8 | SCLK — Serial clock input |
| Broche 9 | CNV — Conversion start input |
| Broche 10 | BUSY — Busy output |
Applications typiques
AD7694BCPZ convient pour 6 applications: Battery-Powered Instrumentation, Industrial Process Control, Medical Instrumentation, Data Acquisition Systems, Portable Medical Devices, Test and Measurement Equipment.
Battery-Powered Instrumentation
The AD7694BCPZ's low power consumption (4.5 mW at 5 V) and wide supply range (2.7 V to 5.25 V) make it ideal for battery-powered instruments such as handheld multimeters and portable data loggers. Its 16-bit resolution ensures accurate measurements, while the power-down mode extends battery life. The small LFCSP package fits space-constrained designs, and the SPI interface simplifies connection to low-power microcontrollers.
Recommandé
Industrial Process Control
In industrial process control, the AD7694BCPZ provides 16-bit precision and 250 kSPS sampling for monitoring sensors like pressure, temperature, and flow. Its differential input rejects common-mode noise, and the -40°C to +85°C operating range suits harsh environments. The SPI interface allows easy integration with industrial PLCs and microcontrollers, enabling real-time control loops.
Recommandé
Medical Instrumentation
The AD7694BCPZ is suitable for medical devices such as patient monitors and diagnostic equipment, where accurate signal acquisition is critical. Its 16-bit resolution and low noise ensure reliable readings, while the low power consumption is beneficial for portable devices. The small package and SPI interface facilitate compact PCB designs, and the wide supply range accommodates battery operation.
Recommandé
Data Acquisition Systems
The AD7694BCPZ is a core component in multi-channel data acquisition systems, offering 16-bit resolution and 250 kSPS throughput. Its SPI interface enables daisy-chaining multiple ADCs for synchronized sampling. The internal clock simplifies design, and the differential input allows direct connection to sensors with differential outputs. The low power dissipation is advantageous in high-channel-count systems.
Recommandé
Portable Medical Devices
For portable medical devices like glucose meters and pulse oximeters, the AD7694BCPZ offers high accuracy with minimal power consumption. Its 16-bit resolution ensures precise measurements, and the power-down mode extends battery life. The compact LFCSP package is ideal for handheld designs, and the SPI interface connects easily to low-power processors.
Recommandé
Test and Measurement Equipment
The AD7694BCPZ is used in test and measurement equipment such as digital multimeters and data loggers, where accuracy and speed are paramount. Its 16-bit resolution and 250 kSPS sampling rate enable precise waveform capture. The differential input and SPI interface provide flexibility in system design, and the wide supply range supports various power architectures.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour AD7694BCPZ — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | AD7694BCPZRL7 | AD7694BRMZ | AD7690BRMZ | AD7980BRMZ |
|---|---|---|---|---|---|
| Package | 10-lead LFCSP (CP-10-2) | 10-lead LFCSP (CP-10-2) - same | 8-lead MSOP | 8-lead MSOP | 10-lead MSOP |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 16 bits | 16 bits | 16 bits | 16 bits | 16 bits |
| Sampling Rate | 250 kSPS | 250 kSPS | 250 kSPS | 400 kSPS | 1 MSPS |
| Input Type | Differential | Differential | Differential | Differential | Differential |
| Supply Voltage | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.3 V to 5.5 V |
| Power Dissipation | 4.5 mW at 5 V | 4.5 mW at 5 V | 4.5 mW at 5 V | 4.5 mW at 5 V | 7 mW at 5 V |
| Interface | SPI | SPI | SPI | SPI | SPI |
Principaux différenciateurs
- Low power consumption (vs AD7980BRMZ)
- Small LFCSP package (vs AD7694BRMZ)
- Internal conversion clock (vs AD7690BRMZ)
Notes de conception
Decouple the VDD pin with a 10 µF ceramic capacitor and a 0.1 µF capacitor placed as close to the pin as possible. The VREF pin should be decoupled with a 1 µF capacitor to ground. A stable, low-noise reference is critical for achieving full 16-bit accuracy; consider using a precision reference like the ADR4550.
Keep the analog input traces short and shielded to minimize noise pickup. Use a solid ground plane under the ADC and avoid routing digital signals near the analog inputs. The exposed pad on the LFCSP package should be soldered to the ground plane for thermal and electrical performance.
Ensure the analog input source impedance is low enough to settle within the acquisition time. The AD7694 has a sampling capacitor that can draw transient currents; a buffer amplifier may be required. Also, avoid exceeding the absolute maximum ratings on the input pins, as this can damage the device.
Informations de conformité
RoHS compliant per Analog Devices product page. Not AEC-Q100 qualified.
