Overview
The MAX191BCWG+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 flexible interface options. It is designed to operate from a single +5V supply or from dual ±5V supplies, allowing for ground-referenced bipolar input signals. The ADC uses successive approximation and input T/H circuitry to convert analog input signals to 12-bit digital outputs. It is particularly suited for applications requiring low power consumption and high accuracy, with a power-down mode that reduces the supply current to 50µA max.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Resolution | 12-bit | |
| Sampling Rate | 100ksps | |
| Conversion Time | 7.5µs | |
| Acquisition Time | 2µs | |
| Supply Voltage Range | 4.75V to 5.25V (single), ±5V (dual) | V |
| Operating Temperature Range | 0°C to 70°C | °C |
| Power Consumption (Operating) | 3mA | mA |
| Power Consumption (Power-Down) | 20µA | µA |
| Integral Nonlinearity | ±1LSB | |
| Differential Nonlinearity | ±1LSB | |
| SINAD at 1kHz Input Signal | 70dB | dB |
| THD at 1kHz Input Signal | -80dB | dB |
| Input Type | Pseudo-Differential | |
| Data Interface | Parallel, SPI, QSPI, MICROWIRE | |
| Package Type | WSOIC, 24 Pins |
Key Features
- 12-bit resolution with ±1/2 LSB linearity
- Internal voltage reference with adjustment capability for trimming system gain errors
- Low power consumption: 3mA in operating mode and 20µA in power-down mode
- Flexible interface options: two 8-bit parallel modes and a serial interface mode compatible with SPI, QSPI, and MICROWIRE standards
- No external hold capacitor required for the track/hold circuit
- Operates from a single +5V supply or dual ±5V supplies, allowing for ground-referenced bipolar input signals
- Decoupling capacitors are the only external components needed for the power supply and reference
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 MAX191BCWG+T ADC?
The MAX191BCWG+T has a 12-bit resolution.
- What is the sampling rate of the MAX191BCWG+T?
The sampling rate is 100ksps.
- What are the operating supply voltage ranges for the MAX191BCWG+T?
The device operates from a single +5V supply or from dual ±5V supplies.
- What is the power consumption in operating and power-down modes?
The power consumption is 3mA in operating mode and 20µA in power-down mode.
- What types of interfaces does the MAX191BCWG+T support?
The device supports two 8-bit parallel modes and a serial interface mode compatible with SPI, QSPI, and MICROWIRE standards.
- Does the MAX191BCWG+T require an external hold capacitor for the track/hold circuit?
No, an external hold capacitor is not required.
- What is the operating temperature range of the MAX191BCWG+T?
The operating temperature range is from 0°C to 70°C.
- What are some common applications of the MAX191BCWG+T?
Common applications include battery-powered data logging, PC pen digitizers, high-accuracy process control, electromechanical systems, and telecommunications.
- How does the MAX191BCWG+T handle system gain errors?
The internal reference features an adjustment input for trimming system gain errors.
- What is the package type of the MAX191BCWG+T?
The package type is WSOIC with 24 pins.
