Overview
The MAX149BCAP+T, produced by Analog Devices Inc./Maxim Integrated, is a part of the MAX148/MAX149 family of 10-bit data-acquisition systems. These devices integrate an 8-channel multiplexer, high-bandwidth track/hold, and a serial interface, offering high conversion speed and low power consumption. They operate from a single supply voltage ranging from +2.7V to +5.25V and can sample at rates up to 133ksps. The MAX149BCAP+T is particularly notable for its internal 2.5V reference and its ability to support both unipolar and bipolar, as well as single-ended and differential analog input configurations.
Key Specifications
| Parameter | Min | Typ | Max | Units |
|---|---|---|---|---|
| Supply Voltage (VDD) | 2.7 | - | 5.25 | V |
| Conversion Rate | - | 133 | - | ksps |
| Resolution | - | 10 | - | bits |
| Operating Temperature Range | 0 | - | 70 | °C |
| Storage Temperature Range | -60 | - | 150 | °C |
| Signal-to-Noise + Distortion (SINAD) | - | 66 | - | dB |
| Total Harmonic Distortion (THD) | - | -70 | - | dB |
| Spurious-Free Dynamic Range (SFDR) | - | 70 | - | dB |
| Channel-to-Channel Crosstalk | - | -75 | - | dB |
| Conversion Time (tCONV) | 5.5 | 7.5 | - | μs |
| Track/Hold Acquisition Time (tACQ) | - | 1.5 | - | μs |
Key Features
- 8-channel multiplexer with high-bandwidth track/hold circuitry.
- Software-configurable analog inputs for unipolar/bipolar and single-ended/differential operation.
- 4-wire serial interface compatible with SPI/QSPI and MICROWIRE devices without external logic.
- Internal 2.5V reference (MAX149) or external reference option (MAX148).
- Reference-buffer amplifier with ±1.5% voltage-adjustment range.
- Hard-wired active-low SHDN pin and software-selectable power-down mode.
- Automatic shutdown at the end of a conversion to reduce power consumption.
- Quick turn-on time allowing shutdown between conversions.
- Available in 20-pin PDIP and 20-pin SSOP packages.
Applications
- Data acquisition systems in industrial, medical, and consumer electronics.
- Automotive systems requiring high-speed and low-power data conversion.
- Embedded systems and microcontrollers needing multi-channel analog-to-digital conversion.
- PLC and DCS systems in industrial automation.
- Medical devices such as patient monitoring systems and diagnostic equipment.
Q & A
- What is the supply voltage range for the MAX149BCAP+T?
The supply voltage range is from +2.7V to +5.25V.
- What is the maximum conversion rate of the MAX149BCAP+T?
The maximum conversion rate is up to 133ksps.
- How many channels does the MAX149BCAP+T support?
The device supports 8 channels.
- What types of analog input configurations are supported by the MAX149BCAP+T?
The device supports both unipolar/bipolar and single-ended/differential analog input configurations.
- What is the resolution of the MAX149BCAP+T?
The resolution is 10 bits.
- What is the operating temperature range for the MAX149BCAP+T?
The operating temperature range is from 0°C to +70°C.
- How does the MAX149BCAP+T manage power consumption during idle periods?
The device can be programmed to automatically shut down at the end of a conversion, reducing power consumption to under 60µA at reduced sampling rates.
- What types of packages are available for the MAX149BCAP+T?
The device is available in 20-pin PDIP and 20-pin SSOP packages.
- Can the MAX149BCAP+T be used with SPI/QSPI and MICROWIRE devices?
Yes, the device has a 4-wire serial interface compatible with SPI/QSPI and MICROWIRE devices without external logic.
- What is the significance of the internal 2.5V reference in the MAX149BCAP+T?
The internal 2.5V reference eliminates the need for an external reference voltage, simplifying the design and reducing component count.
