SBASAQ6 April 2024 ADS9813
ADVANCE INFORMATION
The ADS9813 features a PGA at every analog input channel. The PGA supports single-ended and differential inputs with a bipolar signal swing. Table 6-1 lists the supported analog input ranges. Configure the analog input range independently for each channel with the RANGE_CHx register fields in address 0xC2 and address 0xC3.
DIFFERENTIAL INPUTS | SINGLE-ENDED INPUTS | RANGE_CHx CONFIGURATION |
---|---|---|
±12V | ±12V | 5 |
±10V | ±10V | 4 |
±7V | ±7V | 3 |
±5V | ±5V | 0 |
±3.5V | ±3.5V | 1 |
±2.5V | ±2.5V | 2 |
Each analog input channel features an antialiasing, low-pass filter (LPF) at the output of the PGA. Table 6-2 lists the various programmable LPF options available in the ADS9813 corresponding to the analog input range. Figure 5-14 and Figure 5-15 illustrate the frequency responses for low-bandwidth and wide-bandwidth LPF configurations. Select the analog input bandwidth for the eight analog input channels with the ANA_BW[7:0] bits in address 0xC0 of register bank 1.
LPF | ANALOG INPUT RANGE | CORNER FREQUENCY (–3dB) |
---|---|---|
Low-bandwidth | All input ranges | 21.2kHz |
Wide-bandwidth | ±12V | 375kHz |
±10V | 385kHz | |
±7V | 400kHz | |
±5V | 320kHz | |
±3.5V | 240kHz | |
±2.5V | 185kHz |