AK5385BVF Integrated Circuits (ICs)

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1. Describe

The AK5385BVF is a 24-bit, 192kHz sampling 2-channel A/D converter for high-end audio systems. The modulator in the AK5385B adopts an enhanced two-bit architecture, and the AK5385B achieves high accuracy and low cost. The AK5385B has a dynamic range of 114dB, making the device suitable for AV amplifiers, AV recorders and musical instruments. The AK5385B is available in 28-pin VSOP and SOP packages that take up less board space.

2. Features

    1. Sampling rate: 8kHz ~ 216kHz

    2. Fully differential input

    3. S/(N+D): 103dB

    4. DR: 114dB

    5. S/N: 114dB

    6. High performance linear phase digital anti-aliasing filter

        - Passband: 0~21.768kHz ( @fs=48kHz)

        - Ripple: 0.005dB

        - Stop Band: 100dB

    7. Digital HPF

    8. Power supply: 5V ± 5% (analog), 3.0 ~ 5.25V (digital)

    9. Power consumption: 183mW (@fs=48kHz)

  10. Package: 28pin SOP / 28pin VSOP

  11. AK5383/AK5393/AK5394A Semi-Pin compatible

3. Pin configuration

4. Pin Description

5. Power Down and Reset

The AK5385BVF is placed in the power-down mode by bringing PDN pin “L” and the digital filter is also reset at the same time. This reset should always be done after power-up. In the power-down mode, the VCOM is AGND level. An analog initialization cycle starts after exiting the power-down mode. Therefore, the output data SDTO becomes available after 516 cycles of LRCK clock in master mode (517 cycles in slave mode). During initialization, the ADC digital data outputs of both channels are forced to “0”. The ADC outputs settle in the data corresponding to the input signals after the end of initialization (Settling approximately takes the group delay time). 

6. Analog Inputs

Analog signal is differentially input into the modulator via the LIN+ (RIN+) and the LIN− (RIN−) pins. The input voltage is the difference between the LIN+ (RIN+) and LIN− (RIN−) pins. The full scale of each pin is nominally ±2.9Vpp(typ). The AK5385BVF can accept input voltages from AVSS to AVDD. The ADC output data format is 2’s complement. The internal HPF removes the DC offset. The AK5385BVF samples the analog inputs at 128fs (6.144MHz@fs=48kHz, Normal Speed Mode). The digital filter rejects noise above the stop band except for multiples of 128fs. The AK5385B includes an anti-aliasing filter (RC filter) to attenuate a noise around 128fs. The AK5385BVF accepts +5V supply voltage. Any voltage which exceeds the upper limit of AVDD+0.3V and lower limit of AVSS−0.3V and any current beyond 10mA for the analog input pins (LIN+/−, RIN+/−) should be avoided. Excessive currents to the input pins may damage the device. Hence input pins must be protected from signals at or beyond these limits. Use caution specially in case of using ±15V in other analog circuits.