Overview
The MAX191BCWG+ is a monolithic, CMOS, 12-bit analog-to-digital converter (ADC) produced by Analog Devices Inc./Maxim Integrated. This device is designed for high-accuracy and low-power applications, featuring differential inputs, a track/hold (T/H) circuit, and an internal voltage reference. It operates from a single +5V supply or from dual ±5V supplies, allowing for ground-referenced bipolar input signals. The MAX191BCWG+ is versatile, supporting both parallel and serial interface modes, including compatibility with SPI, QSPI, and MICROWIRE standards.
Key Specifications
| Parameter | Min | Typ | Max | Units |
|---|---|---|---|---|
| Resolution | 12 Bits | |||
| Conversion Time | 7.5 µs | |||
| Acquisition Time | 2 µs | |||
| Sampling Rate | 100 ksps | |||
| Supply Voltage | +5V or ±5V | V | ||
| Operating Current | 3 mA | mA | ||
| Power-Down Current | 20 µA | 50 µA | µA | |
| Offset Error | ±1 LSB (MAX191A) | ±2 LSB (MAX191B) | LSB | |
| Differential Nonlinearity | ±1 LSB | LSB | ||
| Integral Nonlinearity | ±1/2 LSB (MAX191A) | ±1 LSB (MAX191B) | LSB | |
| Gain Error | ±1 LSB (MAX191A) | ±3 LSB (MAX191B) | LSB | |
| Storage Temperature Range | -65°C | +160°C | °C | |
Key Features
- 12-bit resolution with 1/2 LSB linearity
- Operation from +5V or ±5V supplies
- Built-in track/hold circuitry
- Internal reference with adjustment capability
- Low power consumption: 3 mA operating mode, 20 µA power-down mode
- 100 ksps tested sampling rate
- Parallel and serial interface modes (SPI, QSPI, MICROWIRE compatible)
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+ ADC?
The MAX191BCWG+ has a 12-bit resolution. - What are the supply voltage options for the MAX191BCWG+?
The device can operate from a single +5V supply or from dual ±5V supplies. - What is the conversion time of the MAX191BCWG+?
The conversion time is 7.5 µs. - What is the sampling rate of the MAX191BCWG+?
The device has a guaranteed sampling rate of 100 ksps. - Does the MAX191BCWG+ have an internal reference?
Yes, it features an internal voltage reference with an adjustment input for trimming system gain errors. - What are the interface modes supported by the MAX191BCWG+?
The device supports two 8-bit parallel modes and a serial interface mode compatible with SPI, QSPI, and MICROWIRE standards. - What is the power consumption in operating and power-down modes?
The operating current is 3 mA, and the power-down current is 20 µA to 50 µA. - What are some typical applications of the MAX191BCWG+?
Applications include battery-powered data logging, PC pen digitizers, high-accuracy process control, electromechanical systems, and more. - What is the storage temperature range for the MAX191BCWG+?
The storage temperature range is -65°C to +160°C. - Does the MAX191BCWG+ require external components for operation?
No external hold capacitor is required; only decoupling capacitors are needed for the power supply and reference.
