[AK4492]
■ DSD Mode
(Ta = 25 C; LDOE pin = “L”, AVDD = TVDD = DVDD = 1.8 V; AVSS = DVSS = VSSL/R = 0 V; VREFHL/R
= VDDL/R = 5.0 V, VREFLL/R = 0 V; Signal Frequency = 1 kHz; Measurement bandwidth = 20 Hz ~ 20
kHz; External Circuit: Figure 74; 2 Vrms output mode (GC[2:0] bits = “000” or GAIN pin = “L”); unless
otherwise specified.)
Parameter
Min.
Typ.
Max.
Unit
Dynamic Characteristics
THD+N
(Note 21)
DSD data stream:
2.8224 MHz
DSD data stream:
5.6448 MHz
DSD data stream:
11.2896 MHz
DSD data stream:
2.8224 MHz
DSD data stream:
5.6448 MHz
DSD data stream:
11.2896 MHz
0dB
0dB
0dB
-
-
-
-
-
-
-111
-112
-107
123
123
123
-
-
-
-
-
-
dB
dB
dB
dB
dB
dB
S/N
Digital“0”
(Note 24)
Digital“0”
(Note 24)
Digital“0”
(Note 24)
(A-weighted,
Normal path)
(Note 21)
DC Accuracy
Output Voltage (Normal path)
Output Voltage (Volume Bypass)
(Note 25)
(Note 25)
2.65
2.38
2.8
2.5
2.95
2.63
Vpp
Vpp
Note 21. References values in using AK4137 as the input source. This value does not change by
increasimg the signal amplitude with gain adjustment function.
Note 22. The peak level of DSD signal should be in the range of 25% ~ 75% duty according to the
SACD format book (Scarlet Book).
Note 23. The output level is assumed as 0dB when a 1kHz 25% ~ 75% duty sine wave is input. Click
noise may occur if the input signal exceeds 0dB.
Note 24. Digital “0” is a digital zero code pattern (“01101001”) according to the SACD format book
(Scarlet Book).
Note 25. In case of GC[2:0] = “000” and DSDD bit = “1”, the analog output voltage at input signal = 0dB is
following equation.
AOUTL/R (typ.@0 dB) = (AOUTLP/RP) (AOUTLN/RN) = 2.5 Vpp (VREFHL/R VREFLL/R)/5
.
016011073-E-00
2016/12
- 14 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
