Sowter 8347 and 9055DAC Interface Transformers |
PACKAGE OPTIONS | Part Number |
| Coloured Leads | 8347-F / 9055-F | |
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| APPLICATION Designed for use with
Burr-Brown PCM67, PCM1702, PCM63 or similar Digital-to-Analogue Converter.
Provides current to voltage conversion with approximately 25 dB gain.
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. If two DACs are use in complimentary mode (driven by
true and inverted data) transformer type 9055 has twin identical bifilar
wound primary windings. This gives the ultimate in cancellation of
quantisation noise.
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 Accurate phase splitting (balance) on output for driving differential (push-pull) amplifier. Mumetal core for minimal harmonic distortion. Internal electrostatic shield for rejection of digital noise. Mumetal can for magnetic shielding. | ||
| RATIO | Type 8347 | 1:18.7 |
| Type 9055 | 1+1:18.7 | |
| QUIESCENT INPUT CURRENT (MAXIMUM) | -0.6 mA | |
| PEAK SIGNAL CURRENT (using circuit below with 25 ohm resistor) | +/- 2.0 mA | |
| I/V RESISTOR | Type 8347 | 25 ohms |
| Type 9055 | 50 + 50 ohms | |
| OUTPUT BALANCE | >70 dB | |
| FREQUENCY RESPONSE Using application circuit. | +/- 0.25 dB 10 Hz to 50 kHz | |
| PHASE SHIFT | <15 degrees at 30 KHz | |
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8347 |
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| 9055
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| E A Sowter Ltd PO Box36 IPSWICH IP1 2EL England |
Tel: +44(0)1473 252794 Fax: +44(0)1473 236188 |
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