BU7839GVW Datasheet, PDF (7/16 Pages) Rohm – Digital Input Hi-Fi Class-D Headphone Amplifier

●Electrical Characteristic
Ta=25degree,DVDD=DVDDIO=1.5V,VDD_R=VDD_L=PLLVDD=2.8V,REFCLK=12MHz,fs=44.1kHz,f=1kHz,Load=16Ω,A-weight,
20kHzLPF,Slave mode
Standardized values
Unit
Note
Item
Symbol
MIN
TYP
MAX
Static consumption current
DVDD
IDDst
-
Static consumption current _ICCst
-
VDD_R+VDD_L
Static consumption current
PLLVDD
IPLLst
-
-
10
uA At the time of standby
-
10
uA At the time of standby
-
10
uA At the time of standby
Consumption current DVDD
IDD
Consumption
VDD_R+VDD_L
current
ICC
-
0.6
2.0
mA ^{At the time of 0.1mW output}
(in slave mode)
-
2.0
6.0
mA At the time of 0.1mW output
Consumption current PLL
IPLL
-
0.8
2.5
mA
Output amplitude error
Vout
-2
-
Channel-to-channel gain error
Gerr
-1
-
Errors with reference to
2
dB standard values at the time of
0dBFS output are as follows
1
dB Lch-Rch
S/N
SN
60
80
-
dB 0dBFS, A-Weight
THD+N
THD
-40
-60
-
dB -3dBFS, A-Weight
Channel-to-channel isolation
Iso
65
80
-
dB 0dBFS, 1kHz BPF
PSRR
Psrr
-
0
-
dB
Table 9 Electrical characteristic
<S/N measuring method>
Measure the level ratio of the respective integral values of the signals and noise within the band of 20kHzLPF
+A-Weight.
<THD+N measuring method>
Measure the level ratio of the total harmonic component + (plus) noise and the basic wave frequency component within
the band of 20kHzLPF +A-Weight.
●Output amplitude error
Output amplitude is determined by the equivalent series resistance of external coil. Let Lr, VDD and Z respectively
stand for the equivalent series resistance, the power supply voltage value of VDD_R,VDD_L and the load impedance, the
standard value of output amplitude becomes the following equation:
Standard value of output amplitude [Vpp] = VDD x 0.5 x Z / ( Lr + Z + 2 )
OUT_R
OUT_L
220uF
Level Shifter
2Ω
LrΩ 100uH
0.1uF
ZΩ
(16Ω)
Shown in the following table is the standard values of output amplitude if VDD=2.8V, Load impedance Z=16Ω, and
Equivalent series resistance is 0.7Ω, 4Ω or 7Ω.
Equivalent series
resistance [Ω]
0.0
0.7
4.0
7.0
Standard value of Standard value of
output amplitude [Vpp] output amplitude [dBv] Output power [mW]
1.24
-7.13
12.10
1.20
-7.46
11.21
1.02
-8.87
8.10
0.90
-9.98
6.27
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