9762 DAC INTERFACE TRANSFORMER

APPLICATION Our most popular transformer for use with most current out Digital-to-Analogue Converters. Designed for and tested with AD1865N-J . Works well with any other current out DAC . Provides current to voltage conversion with approximately 22 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. An I/V resistor of 200 ohms is suggested but there is sufficient inductance for good quality operation with higher values. Lower values may improve the sound but will reduce the output. Can be configured to drive 9335 attenuator without loss of bandwidth. Can be used driven from multiple parallel DAC's to increase output level.

The I/V resistor across the secondary of the transformer instead of the primary has yeilded the best result according to some customers. The value of the resistor should be increased by the ratio squared. The table below suggests values for rexperiment.

FEATURES Exceptionally large and high performance transformer. 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. Mumetal can for magnetic shielding. Mumetal core for minimal harmonic distortion. Internal electrostatic shields to maximise output balance and noise immunity. Mumetal can for magnetic shielding.

CAN DIMENSIONS

45 mm Dia. x 52.5 high

PRIMARY INDUCTANCE

2.3 H

PRIMARY DC RESISTANCE

6.5 Ohms approx.

SECONDARY DC RESISTANCE

1.25k Ohms approx

RATIO

1 : 6.4+6.4

SUGGESTED I/V RESISTOR

Across
primary

secondaries parallel

200 Ohms

secondaries series

100 Ohms

Across secondary

secondaries parallel

4.2k Ohms

secondaries series

16k Ohms

FREQUENCY RESPONSE (Typical)

Parallel secondary windings

+/- 1.5 dB 5 Hz to 100 kHz

Series secondary windings

+/- 1.5 dB 5 Hz to 50 kHz

9762 DAC INTERFACE TRANSFORMER APPLICATION Our most popular transformer for use with most current out Digital-to-Analogue Converters. Designed for and tested with AD1865N-J . Works well with any other current out DAC . Provides current to voltage conversion with approximately 22 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. An I/V resistor of 200 ohms is suggested but there is sufficient inductance for good quality operation with higher values. Lower values may improve the sound but will reduce the output. Can be configured to drive 9335 attenuator without loss of bandwidth. Can be used driven from multiple parallel DAC's to increase output level. The I/V resistor across the secondary of the transformer instead of the primary has yeilded the best result according to some customers. The value of the resistor should be increased by the ratio squared. The table below suggests values for rexperiment.
FEATURES Exceptionally large and high performance transformer. 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. Mumetal can for magnetic shielding. Mumetal core for minimal harmonic distortion. Internal electrostatic shields to maximise output balance and noise immunity. Mumetal can for magnetic shielding.
CAN DIMENSIONS		45 mm Dia. x 52.5 high
PRIMARY INDUCTANCE		2.3 H
PRIMARY DC RESISTANCE		6.5 Ohms approx.
SECONDARY DC RESISTANCE		1.25k Ohms approx
RATIO		1 : 6.4+6.4
SUGGESTED I/V RESISTOR		Across primary	secondaries parallel	200 Ohms
			secondaries series	100 Ohms
		Across secondary	secondaries parallel	4.2k Ohms
			secondaries series	16k Ohms
FREQUENCY RESPONSE (Typical)	Parallel secondary windings	+/- 1.5 dB 5 Hz to 100 kHz
	Series secondary windings	+/- 1.5 dB 5 Hz to 50 kHz