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AD CONVERTER DPR-AD01

The new AD01 from DPR is a professional 20-Bit analog to digital converter, combining superior analog input circuitry with extensive external synchronisation modes.

By using an internal 20-Bit sampling frequency converter, the A/D-converter circuit always turns on its own crystal based clock reference whereas sampling frequency fluctuations and jitter of the external sync signal do not imply signal degradation of the conversion process due to the attenuation of jitter-frequencies above 3 Hz. The AD01 can be synchronised to either wordclock signals (28 kHz up to 56 kHz) or to an AES-EBU clock as well as to video PAL or NTSC-signals (provided the video option is installed).

A 35-step bargraph display enables the user accurate metering of the input signal and due to the internally used DSP, a true digital peak or VU-meter with selectable characteristics and time constants offers, therefore, a maximum of available dynamic range. Five standard input reference levels (-10 dBu, 0 dBu, +4 dBu, +6 dBu, +15 dBu) as well as a user defined reference level help to integrate the AD01 in any existing studio environment.

The AD01 has a professional AES-EBU output or alternatively a consumer SPDIF coaxial and optical output, all of them providing full implementation of the necessary channel status.

Additionally the AD01 offers a stereo or a true 2-channel mode, a switchable limiter on the analog inputs as well as a 16-Bit mode providing properly dithered output data for CD and RDAT applications.

With its superior sound quality and its large dynamic range the AD01 is the right choice for the professional recording studio, the broadcaster, the professional video studio or the high end consumer user.

Specifications of the AD01 Converter

Analogical part
· 2 ajustable analogical inputs with 2 potentiometers as well as 2 commutators allowing to choose the input level (+ 15 dBu, + 6 dBu, + 4 dBu, 0 dBu, - 10 dBu and adjustable from + 15 dBu to - 10 dBu).
· The inputs are symmetrical with transformers.
· The inputs are on cannon connectors.
· The inputs can be selected in stereo mode or in 2-channels mode.
· The inputs are provided with 2 analogical limiters which can be selected. The adjustment of the threshold can be chosen internally.
· Selection of the emphasis (on/off).

Display part
· The display is composed of 2 x 35 Led. It is a digital measure of the signal processed by a DSP which allows the display of the signal value in Peak-meter or in Vu-meter.
· 2 additional Led are intended for displaying the overload of which parameters can be modified through PC (RS232).
· In peak hold mode, the peak display as well as the overload are memorized permanently and can be deleted.

Conversion part
· The AD converter is a 20 Bit converter which always turns on its own internal reference frequency. When using external synchronisation, a SFC (sampling frequency converter) is used. The SFC does not imply signal degradation due to conversion process. That characteristic is an important advantage of our AD converter.
· The AD converter also works on a 16 Bit mode basis for CD or RDAT applications.

Digital part
· 1 AES/EBU output (cannon connector).
· 2 SPDIF outputs : 1 coaxial and 1 optical.
· All selected functions (e.g. Emphasis, S/2-CH, 20/16) are included in the status of the AES/EBU or SPDIF signal.

Synchronisation part
· Internal 48 / 44.1 / 32 kHz.
· AES/EBU (cannon connector).
· Wordclock from 28 kHz to 53 kHz (BNC connector).
· PAL or NTSC (color or B/W) video sync. with optional module (BNC connector).

SPECIFICATIONS (@ 48 kHz sample rate)

Resolution	20 Bit or 16 Bit switchable
Frequency response	20 Hz - 20 kHz ± 0.1 dB
THD + N (@ -30 dBfs)	-100 dBfs
Dynamic range	-104 dBfs
Linearity @ 0.997 KHz	0 dBfs -> -90 d Bfs ± 0,1 dB - 90 dBfs -> -110 dBfs ± 0,2 dB
Channel separation	20 Hz - 20 kHz > 100 dB
Sampling rate	48 kHz, 44,1 kHz, 32 kHz switchable
External reference	Wordclock, AES-EBU, Video (PAL, NTSC Color or W/B): switchable
Output format	AES-EBU, SPDIF switchable
Emphasis	switchable
ANALOG INPUTS	2
Type	Transformer balanced
Impedance	> 10 kOhms
Connectors	2 x XLR 3-pin female
Maximum input level	+ 24 dBu
Reference input level	+15 dBu, +6 dBu, +4 dBu, 0 dBu, -10 dBu, defined by user: switchable
SYNC- INPUTS	3
AES
Type	Transformer balanced
Impedance	110 Ohms
Connector	XLR 3-pin female
Wordclock
Impedance	75 Ohms
Connector	BNC
Video
Impedance	infiny or 75 Ohms
Connector	BNC
DIGITAL OUTPUTS	3
AES
Type	Transformer balanced
Impedance	110 Ohms
Connector	XLR 3-pin male
SPDIF coaxial
Type	Transformer balanced
Impedance	110 Ohms
Connector	RCA
SPDIF optical
Type	optical, 660 nm
Connector	EIAJ RC-5720
Weight	~ 5 kg
Dimensions	488 x 44 x 295 mm
Mains input voltage	230/110 V ~
Specifications subject to change without notice. August 1999