ak4525 AKM Semiconductor, Inc., ak4525 Datasheet - Page 16

• Manufacturer Part Number: ak4525
• Description: 20bit Stereo ?? Adc & Dac With X? Tal Osc
• 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 12
shows the example of external op-amp circuit with 6dB gain. The output signal is inverted by using the circuit in this
case.
MS0053-E-00
AK4525
AOUTL
2.9Vpp
10u
AINR+
AINR-
AINL+
AINL-
BIAS
+
2
3
4
5
0.1u
1.5Vpp
1.5nF
Figure 12. External analog circuit example (gain=6dB)
27u
1.5Vpp
+
Figure 11. Differential Input Buffer Example
Vop
330
330
Same circuit
4.7k
4.7k
NJM2100
10k
10k
+
-
Rch Op-amp
- 16 -
Vop=VA=5V
Vop
+
10k
-
18k
Optional amp with 6dB gain
NJM5532
Vop
+
-
10u
+
4.7k
Vop=12V
4.7k
4.7k
Vop
27k
10k
0.1u
22u
5.22Vpp
+
Lch Out
BIAS
10u
Signal
3.2Vpp
[AK4525]
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