Operating instructions

30
Analog to Digital Conversion
Analog signals can be converted to digital at sampling rates of 44.1, 48, 88.2, 96, 176.4, and
192kHz. The digital output signal is in 24-bit format.
The digitized signal is sent to all digital outputs (AES/EBU, S/PDIF, and ADAT S–MUX)
simultaneously.
Audio digitized at rates above 48kHz is transmitted over AES/EBU in single or dual-wire mode, as
specified by the Single/Dual switch (page 27).
Audio digitized at rates above 48kHz is transmitted over ADAT optical with S–MUX interleaving.
At 88.2kHz and 96kHz, channels 1-4 are used to achieve the stereo transfer. At 176.4kHz and
192kHz, all 8 channels are used for stereo audio. At 44.1kHz and 48kHz, only channels 1 and 2
are used.
The S/PDIF interface transmits 24-bit audio at rates up to 192kHz.
When the Analog Outputs knob (page 26) is set to ADC, the signals at the analog outs are the
analog input signals after they have passed through both the A/D and D/A converters, enabling
“true confidence” analog monitoring of the digitized signal.
Important: Do not change any front panel knob or switch settings while A/D
conversion is in process. The signal is briefly interrupted when new settings are
applied.
Important: Set the Digital Outputs knob to ADC when performing A/D conversion.
A/D conversion can be performed in either of two configurations: using the internal clock, or
when the 2192 is slaved to an external clock. Each operation is detailed below.
A/D Using Internal Clock
This is the simplest use of the 2192. In this configuration, the 2192 is the master system clock.
Four word clock outputs are provided so the 2192 can be used as the master system clock without
cascading the clock through external devices, which can degrade the clock signal.
To perform A/D conversion using the internal clock:
1. Connect the analog source signals to the 2192 line inputs.
2. Connect the 2192 digital output(s) to the external device digital input(s) that will receive the
digitized audio signal using an appropriate digital cable(s).
3. Set the 2192 Clock knob to Internal.
4. Set the 2192 Sample Rate knob to the desired frequency.
5. Set the 2192 Digital Outputs knob to ADC.
6. Set the external digital device to synchronize to the 2192 and receive the digitized audio
signal.
A/D conversion is continuous in internal clock mode.