Overview
The MAX1221, produced by Analog Devices Inc./Maxim Integrated, is a highly integrated analog-to-digital converter (ADC) and digital-to-analog converter (DAC) in a single IC. This device is part of the MAX1221/MAX1223/MAX1343 family and is designed to offer a comprehensive set of features for various applications. It includes a 12-bit multichannel ADC, a 12-bit DAC, a temperature sensor, and configurable general-purpose I/O ports (GPIOs). The device supports a 25MHz SPI-/QSPI-/MICROWIRE-compatible serial interface, making it versatile for different system architectures.
Key Specifications
| Parameter | Value | Units |
|---|---|---|
| ADC Resolution | 12-bit | |
| ADC Conversion Rate | Up to 225ksps | |
| DAC Resolution | 12-bit | |
| DAC Settling Time | 2.0µs | |
| Internal Reference | 2.5V | |
| Supply Voltage Range | +2.7V to +5.25V | |
| Power Consumption (225ksps) | 2.5mA | |
| Power Consumption (1ksps) | 22µA | |
| Power Consumption (Shutdown) | < 0.2µA | |
| Operating Temperature Range | -40°C to +85°C | |
| Package Type | 36-pin thin QFN |
Key Features
- 12-bit multichannel ADC and 12-bit DAC in a single IC
- Internal ±1°C accurate temperature sensor
- FIFO, scan modes, and programmable internal or external clock modes
- Data averaging and AutoShutdown™ for power minimization
- Low glitch energy (4nV•s) and low digital feedthrough (0.5nV•s) of the integrated DACs
- Configurable GPIOs that can be used as inputs or outputs
- 25MHz SPI-/QSPI-/MICROWIRE-compatible serial interface
- Programmable reference modes for ADC and DAC using internal, external, or a combination of both references
Applications
The MAX1221 is suitable for a variety of applications that require precise analog-to-digital and digital-to-analog conversions, temperature sensing, and flexible I/O configurations. These include:
- Digital control of fast-response closed-loop systems
- Industrial automation and control systems
- Medical devices requiring precise ADC and DAC functionality
- Aerospace and defense applications needing robust and reliable ADC/DAC solutions
- Automotive systems that require temperature sensing and ADC/DAC capabilities
Q & A
- What is the resolution of the ADC and DAC in the MAX1221?
The MAX1221 features a 12-bit ADC and a 12-bit DAC.
- What is the maximum conversion rate of the ADC?
The ADC can convert at rates up to 225ksps.
- What is the settling time of the DAC outputs?
The DAC outputs settle within 2.0µs.
- What is the internal reference voltage provided by the MAX1221?
The internal reference voltage is 2.5V.
- What is the operating temperature range of the MAX1221?
The device operates over a temperature range of -40°C to +85°C.
- How many GPIOs are available on the MAX1221, and what are their configurations?
The MAX1221 offers four GPIOs that can be configured as inputs or outputs.
- What is the power consumption of the MAX1221 at different throughput rates?
The device consumes 2.5mA at 225ksps, 22µA at 1ksps, and under 0.2µA in shutdown mode.
- What type of serial interface does the MAX1221 support?
The MAX1221 supports a 25MHz SPI-/QSPI-/MICROWIRE-compatible serial interface.
- What are the key features of the temperature sensor in the MAX1221?
The temperature sensor is accurate to ±1°C.
- What are some typical applications of the MAX1221?
The MAX1221 is used in digital control of fast-response closed-loop systems, industrial automation, medical devices, aerospace and defense, and automotive systems.
