AD3

12 A/D Channels (±25mA FSR); 24-bit Sigma-Delta

Module AD3 features 12 channels with up to 24-bit Sigma-Delta A/D converters for each individual channel. The maximum programmable, expected full-scale range input for the AD3 module is ±25 mA respectively. The A/D converters have programmable sample rates of up to 256 kHz.

The input range and gain is also field-programmable for each channel. The ability to set lower expected, full-scale voltage gain ranges assures the use of the full resolution. Each channel includes a fixed, second order, anti-aliasing filter and a digital post filter with a programmable breakpoint that enables users to field-adjust the filtering for each channel.

The extended A/D FIFO buffering capabilities of these modules supports greater storage/management of the incoming signal samples (data) for post-processing applications. Data samples can be stored in the buffer either at the maximum programmed base A/D sample rate or by an integer-divided sample rate. Programmable FIFO buffer thresholds maximize data flow control (movement in and out of the FIFO). Incremental relative time-stamping between samples also is provided as a programmable option.

All A/D channels are self-aligning and continuous Background Built-in-Test (BIT) status is provided for channel health and operation feedback. On a rotating basis, each channel is automatically trimmed/tested for optimal conversion and reliability to eliminate offset and gain errors throughout the entire operating envelope (temperature and drift control). Open inputs are sensed and flagged.

Features

• Number of Channels: 12
• ADC Type / Architecture: Σ-Δ / Individual
• Key Characteristics Range (max): ±25 mA
• Effective Resolution Bits: 24
• Sampling Rate (max.): 256 kHz / Channel