BD88400FJ
80-mW 无需耦合电容器 立体声耳机放大器
BD88400FJ
80-mW 无需耦合电容器 立体声耳机放大器
BD88400FJ是无需输出耦合电容器的耳机放大器。本IC内置有稳压电荷泵型负电源发生电路，可从电源电压直接生成稳定的-2.4V负电压。通过采用+2.4V的正电压与该负电压的两种电压来驱动耳机放大器，以ground level为基准进行输出。因此，无需大容量的输出耦合电容器，可直接连接耳机。由此，可降低成本，缩减电路板面积，降低部件的高度。此外，没有因输出耦合电容器与输出负载阻抗引起的低音区域的信号衰减，可输出丰富的低音。
主要规格
特性：
Ext. Gain
Yes
Output Type
C-less
Number of Ch
2
Gain [dB]
Variable
Maximum Output [mW,RL=16Ω]
80+80
Maximum Output [mW,RL=32Ω]
60+60
Minimum Load [Ω]
16
Input Type
Analog
THD+N [%,RL=16Ω]
0.006
S/N [dB]
101
Start Up Time [µs]
80
Stand-by Current [µA]
0.1
Power Supply Voltage (Min.) [V]
2.4
Power Supply Voltage (Max.) [V]
5.5
Headphone PSRR[dB]
-80
Operating Temperature (Min.)[°C]
-40
Operating Temperature (Max.)[°C]
85
Package Size [mm]
8.65x6 (t=1.65)
特点：
- No Bulky DC-Blocking Capacitors Required
- No Degradation of Low-Frequency Response Due to Output Capacitors
- Ground-Referenced Outputs
- Gain setting: Variable Gain with External Resistors
- Low THD+N
- Low Supply Current
- Integrated Negative Power Supply
- Integrated Short-Circuit and Thermal-Overload Protection
Reference Design / Application Evaluation Kit
-
- Evaluation Board - BD88400FJ-EVK-001
BD88400FJ is an output coupling capacitorless headphone amplifier. This IC has a built-in regulated negative voltage generator type that generates the direct regulated negative voltage from the supply voltage. It is possible to drive headphones in a ground standard with both voltage of the positive voltage (+2.4V) and the negative voltage (-2.4V).
