DAC INTERFACE TRANSFORMERAPPLICATION Designed for use with most current out Digital-to-Analogue Converters. Provides current to voltage conversion with approximately 20 dB gain. (26 dB if two DACs are used). Presents a low impedance to the DAC output for best frequency response. Provides significant sound quality improvement when compared to other interface methods. Ensures full isolation of digital noise in ground and supply rails. I/V resistors of 100 (or 200 ohms if two DACs are used) are suggested but there is sufficient inductance for good quality operation with higher values. Can be configured to drive 9335 attenuator without loss of bandwidth.The I/V resistor may be used across the secondary of the transformer instead of the primary. The value of the resistor should be increased by the ratio squared. Doing this may give a different sound by changing the filtering effect. |
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FEATURES Exceptionally
large and high performance transformer. Can be used with two DACs in complimentary mode (driven by
true and inverted data) by means of twin identical bifilar
wound primary windings. This gives the ultimate in cancellation of
quantisation noise. 9545 may be used with a single DAC by connecting the
primary windings in parallel. Twin secondary
windings for driving differential (push-pull) amplifier. These may be used
in parallel to improve the bandwidth and reduce the output impedance to 5K
which is suitable for driving our type 9335 attenuator. Mumetal core for
minimal harmonic distortion. Internal electrostatic shields to
maximise output balance and noise immunity. Mumetal can for magnetic shielding. |
PRIMARY INDUCTANCE |
6H (each primary). 24H in series |
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PRIMARY DC RESISTANCE |
10 ohms (in parallel) |
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SECONDARY DC RESISTANCE |
1800 ohms (in series) |
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RATIO |
1+1 : 5+5 |
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SUGGESTED I/V RESISTOR |
Parallel primaries |
100 ohms |
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Separate primaries |
200 ohms |
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FREQUENCY RESPONSE Using application
circuit. |
+/- 0.25 dB 5 Hz to 50 kHz |
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