ak4523 AKM Semiconductor, Inc., ak4523 Datasheet - Page 18

• Manufacturer Part Number: ak4523
• Description: 20bit Stereo Ds Adc & Dac
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
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.
M0021-E-03
AOUTL
2.9Vpp
10u
BIAS
+
0.1u
Figure 11. External analog circuit example (gain=6dB)
27u
+
Vop
4.7k
4.7k
10k
Rch Op-amp
- 18 -
Vop
+
-
18k
Optional amp with 6dB gain
NJM5532
10u
+
Vop=12V
27k
5.22Vpp
Lch Out
[AK4523]
1999/12