Main Features

SR2_Analog_16 is an add-on board for the Signal Ranger MK2 board. It provides two functions:

• Provides 16 analog inputs and 16 analog outputs.
  
  
• Provides bus switches on Signal Ranger MK2’s FPGA I/Os. These bus switches provide protection to the I/Os and to external circuitry connected to them in case Signal Ranger MK2 is powered while the external circuitry is not, or vice versa. Furthermore, they make I/Os configured as inputs 5V-tolerant.

Three of Signal Ranger MK2’s FPGA I/Os are used to manage the Analog Interface Circuits (AICs). Therefore, these I/Os are not available to the user when SR2_Analog_16 is present. In addition, the AICs also use two McBSPs of the DSP and four channels of the DMA controller. Therefore, they are not provided to the user either.

Technical Data

Differential Analog Inputs

Number of inputs:	16 (synchronized)
Resolution:	16 bits
Noise:	SNR: 88 dB
Sampling rate:	0 to 26 kHz (104 kHz w/o anti-aliasing filter)
Bandwidth:	0 to Fs/2 (includes DC)
Dynamic range:	Single Ended: ±10V - Differential: ±20V
Input impedance:	85 kOhms
Adjustable gain:	0 to 42 dB in 1.5 dB steps, 48 dB, 54 dB
Anti-aliasing filter:
IIR: Group-delay 5 samples    FIR: Group-delay 18 samples

Microphone Inputs

• Microphone input may be selected on any of the 16 analog inputs.
• Direct interface to an electret microphone (10 kOhms load).
• High-pass filter cut-off at 16 Hz.

Analog Single-Ended Outputs

Number of outputs: 16 (synchronized)
Resolution:	16 bits
Noise:	SNR: 90 dB
Sampling rate:	0 to 26 kHz (104 kHz w/o anti-aliasing filter)
Bandwidth:	0 to Fs/2 (includes DC)
Dynamic range:	±2V
Output impedance:	50 Ohms
Source/Sink ability:	1 mA
Adjustable attenuation:	0 to -42 dB in 1.5 dB steps, -48 dB, -54 dB
Anti-aliasing filter:
IIR: Group-delay 5 samples    FIR: Group-delay 18 samples