Analog Devices Inc. AD7656YSTZ
| Parameters | |
|---|---|
| Sampling Rate (Per Second) | 250k |
| Voltage - Supply, Analog | 5V |
| Voltage - Supply, Digital | 5V |
| Ratio - S/H:ADC | 1:1 |
| Features | Simultaneous Sampling, True Bipolar |
| Package | Tray |
| Product Status | Active |
| Base Product Number | AD7656 |
| REACH Status | REACH Unaffected |
| Standard Package | 1 |
| ECCN | EAR99 |
| HTSUS | 8542.39.0001 |
| Series | iCMOS® |
| Moisture Sensitivity Level (MSL) | 3 (168 Hours) |
| RoHS Status | ROHS3 Compliant |
| Package / Case | 64-LQFP |
| Mfr | Analog Devices Inc. |
| Mounting Type | Surface Mount |
| Operating Temperature | -40°C ~ 125°C |
| Input Type | Single Ended |
| Configuration | S/H-ADC |
| Supplier Device Package | 64-LQFP (10x10) |
| Number of Inputs | 6 |
| Number of Bits | 16 |
| Number of A/D Converters | 6 |
| Architecture | SAR |
| Reference Type | External, Internal |
| Data Interface | SPI, Parallel, DSP |
AD7656YSTZ - 16-Bit, 250 kSPS, 6-Channel Simultaneous Sampling ADC
1. Overview
The AD7656YSTZ is a high-performance, 16-bit, 250 kSPS (kilo-samples per second), 6-channel simultaneous sampling analog-to-digital converter (ADC) from Analog Devices. It integrates six independent ADCs with a pseudo-differential input architecture, making it ideal for power monitoring, motor control, medical instrumentation, and industrial automation applications.
The ic device operates from a single 5 V supply and features a serial interface (SPI/QSPI/MICROWIRE-compatible) for easy microcontroller interfacing. Its low power consumption (typically 100 mW) and high-accuracy performance make it suitable for battery-powered and precision measurement systems.
2. Functional Description & Applications
The AD7656YSTZ integrates six 16-bit SAR ADCs, each with its own track-and-hold (T/H) amplifier, allowing simultaneous sampling of multiple analog signals. This is critical in applications like three-phase power monitoring, where phase synchronization is required. Also, the AD7656YSTZ is widely used in systems requiring high-speed, multi-channel data acquisition with simultaneous sampling:
- Power Monitoring & Protection Systems (phasor measurement, smart meters)
- Motor Control & Drives (3-phase current/voltage sensing)
- Medical Instrumentation (ECG, EEG, patient monitoring)
- Industrial Automation (PLC, data loggers, test equipment)
- Aerospace & Defense (radar, avionics, power distribution)
· AD7656-1 (Faster throughput, 500 kSPS)
· AD7657 (8-channel version)
· AD7606 (Lower-cost, 200 kSPS variant)
4. Design Considerations
4.1 Power Supply & Decoupling
- Use low-ESR ceramic capacitors (0.1 µF + 10 µF) near the AVDD/DVDD pins.
- Separate analog and digital grounds (AGND/DGND) for noise reduction.
4.2 PCB Layout Guidelines
- Keep analog inputs away from digital signals to minimize crosstalk.
- Use shielded traces for high-impedance sensor inputs.
4.3 Software Configuration
- The AD7656YSTZ supports register-based programming for:
- Input range selection
- Sequencer mode (automatic channel scanning)
- Power-down modes (standby/power-saving)
5. Conclusion
The AD7656YSTZ is a high-accuracy, multi-channel, simultaneous sampling ADC designed for demanding industrial and instrumentation applications. With six 16-bit ADCs, flexible input ranges, and low power consumption, it provides an ideal solution for real-time data acquisition systems.
