Overview
The MAX191ACWG+ is a low-power, 12-bit analog-to-digital converter (ADC) produced by Analog Devices Inc./Maxim Integrated. This monolithic CMOS device features differential inputs, a track/hold (T/H) circuit, an internal voltage reference, and flexible interface options. It is designed for high-accuracy applications and operates from a single +5V supply or dual ±5V supplies, allowing for ground-referenced bipolar input signals.
Key Specifications
| Parameter | Value | Units | Conditions |
|---|---|---|---|
| Resolution | 12-bit | - | - |
| Conversion Time | 7.5µs | - | - |
| Acquisition Time | 2µs | - | - |
| Sample Rate | 100ksps | - | - |
| Supply Voltage | +5V or ±5V | V | - |
| Operating Current | 3mA | mA | - |
| Power-Down Current | 50µA | µA | - |
| Internal Reference Voltage | 4.076 to 4.116 | V | TA = +25°C |
| Interface Modes | Parallel (2 x 8-bit), Serial (SPI, QSPI, MICROWIRE) | - | - |
Key Features
- 12-bit resolution with 1/2LSB linearity
- Low power consumption: 3mA operating mode, 50µA power-down mode
- Built-in track/hold circuitry without the need for an external hold capacitor
- Internal voltage reference with adjustment capability
- Flexible interface options: two 8-bit parallel modes and a serial interface compatible with SPI, QSPI, and MICROWIRE standards
- Single +5V or dual ±5V supply operation, allowing for ground-referenced bipolar input signals
- Logic power-down input to reduce supply current
Applications
- Battery-Powered Data Logging
- PC Pen Digitizers
- High-Accuracy Process Control
- Electromechanical Systems
- Data-Acquisition Boards for PCs
- Automatic Testing Systems
- Telecommunications
- Digital Signal Processing (DSP)
Q & A
- What is the resolution of the MAX191ACWG+ ADC?
The MAX191ACWG+ has a 12-bit resolution.
- What is the conversion time of the MAX191ACWG+?
The conversion time is 7.5µs.
- What is the sample rate of the MAX191ACWG+?
The sample rate is 100ksps.
- What are the supply voltage options for the MAX191ACWG+?
The device can operate from a single +5V supply or dual ±5V supplies.
- What is the power consumption in operating and power-down modes?
The operating current is 3mA, and the power-down current is 50µA.
- Does the MAX191ACWG+ have an internal voltage reference?
Yes, it has an internal voltage reference with adjustment capability.
- What interface modes are available for the MAX191ACWG+?
The device supports two 8-bit parallel modes and a serial interface compatible with SPI, QSPI, and MICROWIRE standards.
- What are some typical applications of the MAX191ACWG+?
Typical applications include battery-powered data logging, PC pen digitizers, high-accuracy process control, and data-acquisition boards for PCs.
- Does the MAX191ACWG+ require external components for operation?
No external hold capacitor is required; only decoupling capacitors are needed for the power supply and reference.
- How does the logic power-down input function?
The logic power-down input reduces the supply current to 50µA in power-down mode.
