Overview
The MAX191ACWG+T is a low-power, 12-bit sampling 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 the option to use either an internal or external clock. It supports both parallel and serial microprocessor interfaces, making it versatile for various applications.
The MAX191 operates from a single +5V supply or from dual ±5V supplies, allowing for ground-referenced bipolar input signals. It includes a logic power-down input that significantly reduces power consumption, dropping the supply current from 3mA to 50µA in power-down mode.
Key Specifications
| Parameter | Units | Min | Typ | Max | Conditions |
|---|---|---|---|---|---|
| Resolution | Bits | 12 | |||
| Conversion Time | µs | 7.5 | |||
| Acquisition Time | µs | 2 | |||
| Sampling Rate | ksps | 100 | |||
| Input Type | Differential | ||||
| Architecture | Successive Approximation (SAR) | ||||
| Operating Temperature | °C | 0 | 70 | ||
| Supply Voltage | V | +5 or ±5 | |||
| Supply Current (Operating) | mA | 3 | |||
| Supply Current (Power-Down) | µA | 50 | |||
| Package | 24-SOIC (0.295", 7.50mm Width) | ||||
Key Features
- 12-bit resolution with 1/2 LSB linearity
- Operation from single +5V or dual ±5V supplies
- Built-in track/hold (T/H) circuitry
- Internal voltage reference with adjustment capability
- Low power consumption: 3mA in operating mode and 50µA in power-down mode
- Three interface modes: two 8-bit parallel modes and a serial interface mode compatible with SPI™, QSPI™, and MICROWIRE™ standards
- No external hold capacitor required for the T/H circuit
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 MAX191 ADC?
The MAX191 has a 12-bit resolution with 1/2 LSB linearity.
- What are the operating voltage options for the MAX191?
The MAX191 can operate from a single +5V supply or from dual ±5V supplies.
- What is the conversion time of the MAX191?
The conversion time of the MAX191 is 7.5µs.
- What is the acquisition time of the MAX191?
The acquisition time of the MAX191 is 2µs.
- What is the sampling rate of the MAX191?
The MAX191 has a guaranteed sampling rate of 100ksps.
- Does the MAX191 require external components for the power supply and reference?
No, decoupling capacitors are the only external components needed for the power supply and reference.
- What interface modes are supported by the MAX191?
The MAX191 supports two 8-bit parallel modes and a serial interface mode compatible with SPI™, QSPI™, and MICROWIRE™ standards.
- How does the power-down mode affect the supply current of the MAX191?
In power-down mode, the supply current is reduced to 50µA from 3mA in operating mode.
- What is the operating temperature range of the MAX191?
The operating temperature range of the MAX191 is from 0°C to 70°C.
- What package type is the MAX191 available in?
The MAX191 is available in a 24-SOIC (0.295", 7.50mm Width) package.
