Adcom GDA-600

GDA-600

The GDA-600 Digital to Analog Converter brings you closer to the reality - and to the astonishing potential - of digital sound by controlling the inherent distortions and design compromises evident in most digital sources.

In keeping with a successful "begin with the basics" approach, Adcom's engineers carefully re-thought the power supply used in this exciting new product. Isolated on its own circuit board, it incorporates a bi-directional AC filter, two transformers, seven separate stages and 27 filter capacitors to increase circuit isolation and minimize noise and unwanted interference.

An industry acclaimed Crystal Semiconductor receiver, custom-configured for minimum jitter, forms the front end for conversion circuitry that includes a high speed digital filter and dual selected Burr-Brown 20 bit ladder-type DACs. Each unit's master clock duty cycle is individually computer-calibrated to insure the highest accuracy.

Linear phase anti-imaging filters, 1% metal film resistors and Adcom's proprietary linear gain amplifiers give exceptional analog performance. Again, individual calibration assures minimal DC offset.

The GDA-600's flexibility is assured by four impedance-matched inputs: three S/PDIF inputs (two coaxial, one optical) and an AES/EBU XLR input. A buffered S/PDIF output lets you record entirely in the digital domain.

Compliance with stringent FCC "Rule 15" standards assures minimum RF and EMI emissions and the highest levels of compatibility with other high performance components in an audio-only or an audio/video home entertainment system.

The GDA-600 is truly an example of Adcom's forward-thinking engineering where low jitter design, Class "A" analog circuitry and Adcom's dedication to the highest quality, custom-configured electronic parts combine for a groundbreaking improvement in digital sound.

Adcom GDA-600 Technical Specifications

DIGITAL

Input format.....S/PDIF, AES/EBU

Input type
S/PDIF Coax (RCA x 2)
S/PDIF Optical (Toslink® x 1)
AES/EBU (XLR X 1)

Input isolation.....Transformer coupled

Input decoding.....Crystal CS 8412 receiver

Digital output.....S/PDIF Coax (RCA X 1)

Digital filter.....Burr-Brown Linear Phase

Resampling rate
8x (352.8kHz for 44.1 kHz input)

DAC type.....Selected R-2R Burr-Brown PCM-63

Resolution.....20 bits

Phase inversion.....Digital domain (manual selection)

ANALOG

Frequency response.....+ 0, - 0.5 dB (DC - 20kHz)

THD
0.009% (20 Hz - 20kHz, full scale)
0.002% (1 kHz, full scale)

Signal to noise ratio
106dB (20Hz - 20kHz, unweighted)
>112 dB (20Hz - 20kHz, "A" wtg.)

Dynamic range.....98dB

Channel-to-channel crosstalk
106dB (20Hz-20kHz)
112dB (1kHz)

Output voltage.....2.234 V RMS (full scale)

Output impedance.....77 ohms

Output type.....Single ended (RCA x 2)

Output mute.....Relay activated (Power, Unlock)

GENERAL

Power requirements
97 - 132 VAC, 50/60 Hz
220-240VAC,50/60Hz

Power consumption (nominal).....15watts at 120VAC

Fuse.....3/8 amp, Slow blow

Dimensions
17"(432mm) x 3 1/2"(89mm) x 10 1/2"(267mm)

Shipping weight.....12 lb.

Specifications subject to change without notice.