Specifications

Prism Media Products Limited AD-2 Dual-rate A/D converter
Operation Manual
Issue 0.2 © Prism Media Products Limited
11 August 1998 Page 43 of 58
Roll-off frequencies:
32kHz (lesser of input and output) rate: >14.5kHz (±0.05dB)
>14.95kHz (-3dB)
44.1kHz (lesser of input and output) rate:>19.5kHz (±0.05dB)
>20.25kHz (-3dB)
48kHz (lesser of input and output) rate: >20.0kHz (±0.05dB)
>21.20kHz (-3dB)
88.2kHz (lesser of input and output) rate:>32.0kHz (±0.05dB)
>33.25kHz (-3dB)
96kHz (lesser of input and output) rate: >35.0kHz (±0.05dB)
>36.35kHz (-3dB)
7.4. Digital Inputs
7.4.1. Input Resolution
Digital input resolution/wordlength: 24 bits
The AD-2 resolves all the data bits of the digital interface formats. Input signals are not
truncated and hence truncation distortion does not occur.
Note: In conformance with the digital audio interface specifications, all signals with professional channel
status that indicate that the auxiliary audio data bits do not carry the main audio signal will have the lower 4
bits masked off to avoid non-audio data adding to the audio. Consumer and SDIF-2 format inputs can accept
24-bits if presented.
Overload LED threshold: 0.05dB below full-scale
7.4.2. Balanced AES3 XLR inputs:
Input impedance: 110S.
These conform with the professional interface, AES3-1992 [Ref. 1], with transformers
for improved isolation. However, data encoded according to the consumer format of
IEC958 [Ref. 4] is also decoded correctly.
The two XLR inputs can be configured to accept 'Split96' format inputs for 88.2kHz and
96kHz signals with one channel per bearer in accordance with [Ref.8]. The XLR input
selection indicators are both illuminated if the inputs are being handled in this way.
Pin 1 of the XLR connectors is connected to the chassis via a capacitor and the signal
is presented differentially across pins 2 and 3. The phase of pins 2 and 3 is
unimportant.