BU7839GVW_10 Datasheet, PDF (7/16 Pages) Rohm – Digital Input Class-D Headphone Amplifier

BU7839GVW
Technical Note
●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
Parameter
Limits
Symbol
Unit
MIN TYP MAX
Condition
Static consumption current DVDD
IDDst
-
-
10 µA At the time of standby
Static consumption current
VDD_R+VDD_L
ICCst
-
-
10 µA At the time of standby
Static consumption current PLLVDD
IPLLst
-
-
10 µA At the time of standby
Consumption current DVDD
IDD
-
0.6
2.0
mA
At the time of 0.1mW output
(in slave mode)
Consumption current VDD_R+VDD_L ICC
-
2.0
6.0 mA At the time of 0.1mW output
Consumption current PLL
Output amplitude error
Channel-to-channel gain error
IPLL
-
0.8
2.5 mA
Errors with reference to
Vout
-2
-
2
dB standard values at the time of
0dBFS output are as follows
Gerr
-1
-
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
<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
Standard value of
output amplitude [Vpp]
1.24
Standard value of
output amplitude [dBv]
-7.13
Output power
[mW]
12.10
0.7
1.20
-7.46
11.21
4.0
1.02
-8.87
8.10
7.0
0.90
-9.98
6.27
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7/15
2010.05 - Rev.A