Overview
The ADC12138CIWMX/NOPB is a self-calibrating 12-bit plus sign analog-to-digital converter (ADC) produced by Texas Instruments. This device features serial I/O compatibility with MICROWIRE, SPI, and QSPI protocols, making it versatile for various applications. The ADC includes a built-in multiplexer and sample/hold circuit, allowing for multiple analog input channels to be selected and converted. The device operates on a single 3.3V or 5V power supply and is known for its high accuracy and low power consumption.
Key Specifications
| Parameter | Specification |
|---|---|
| Resolution | 12-bit plus sign |
| Conversion Time | 8.8 μs (max) |
| Throughput Time | 14 μs (max) |
| Integral Linearity Error | ±2 LSB (max) |
| Power Supply | 3.3V or 5V ±10% |
| Power Consumption (Active) | +3.3V: 15 mW (max), +5V: 33 mW (max) |
| Power Consumption (Power Down) | +3.3V: 40 μW (typ), +5V: 100 μW (typ) |
| Analog Input Range | 0V to 5V |
| Multiplexer Channels | 8 channels |
Key Features
- Self-calibrating to adjust linearity, zero, and full-scale errors to typically less than ±1 LSB each.
- Serial I/O compatible with MICROWIRE, SPI, and QSPI protocols.
- Programmable acquisition time and variable digital output word length and format.
- No zero or full scale adjustment required.
- Power down mode for low power consumption.
- Supports single-ended, differential, or pseudo-differential analog input modes.
Applications
- Pen-based computers
- Digitizers
- Global Positioning Systems (GPS)
- Other applications requiring high-accuracy, low-power analog-to-digital conversion.
Q & A
- What is the resolution of the ADC12138CIWMX/NOPB?
The resolution is 12-bit plus sign.
- What are the supported serial I/O protocols?
The device supports MICROWIRE, SPI, and QSPI protocols.
- What is the maximum conversion time?
The maximum conversion time is 8.8 μs.
- What are the power supply options for this ADC?
The device can operate on either a 3.3V or 5V power supply.
- Does the ADC require zero or full scale adjustments?
No, the ADC does not require zero or full scale adjustments due to its self-calibration feature.
- How many multiplexer channels does the ADC12138CIWMX/NOPB have?
The device has 8 multiplexer channels.
- What are the typical power consumption values in active and power-down modes?
In active mode, it consumes up to 15 mW at 3.3V and 33 mW at 5V. In power-down mode, it consumes typically 40 μW at 3.3V and 100 μW at 5V.
- What is the analog input range of the ADC?
The analog input range is from 0V to 5V.
- Can the ADC operate in differential input modes?
- Is the ADC12138CIWMX/NOPB still in production?
No, the ADC12138CIWMX/NOPB is obsolete and no longer manufactured by Texas Instruments.
