AK4522 Просмотр технического описания (PDF) - Asahi Kasei Microdevices

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AK4522

20Bit Stereo ∆Σ ADC & DAC

Asahi Kasei Microdevices 

ASAHI KASEI

[AK4522]

4. Analog Outputs

The analog outputs are also single-ended and centered around the VCOM voltage. The input signal range scales with the

supply voltage and nominally 0.58 x VREFH Vpp. The DAC input data format is 2’s complement. The output voltage is

a positive full scale for 7FFFFH(@20bit) and a negative full scale for 80000H(@20bit). The ideal output is VCOM

voltage for 00000H(@20bit). The internal switched-capacitor filter and continuous-time filter remove most of the noise

generated by the delta-sigma modulator of DAC beyond the audio passband.

DC offsets on analog outputs are eliminated by AC coupling since DAC outputs have DC offsets of a few mV. Figure 11

shows the example of external op-amp circuit with 6dB gain. The output signal is inverted by using the circuit in this

case.

27u

10k

AOUTL

+

2.9Vpp

Vop

4.7k

BIAS 0.1u

10u +

4.7k

18k

Vop=12V

Vop

-

10u

+

+

NJM5532

Lch Out

5.2Vpp

27k

Rch Op-amp

Optional amp with 6dB gain

Figure 11. External analog circuit example (gain=6dB)

M0020-E-01

- 16 -

1998/10

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