MJE350G DataSheet
DATASHEET
MJE350G 描述
Operating voltage: 2.4V~3.6V Directly drives an external transistor PWM function directly driver speaker Low standby current (1mA typ. for VDD=3V) Minimal external components 240 notes table ROM for key functions Programmable silence length and end-pulse width (minimal end-pulse width is 1.3ms at 8kHz sampling rate) 3-sec voice capacity (based on a 5kHz sam- pling rate) Controllable volume FLAG1 options - End-pulse output - 3Hz, 3HzB flash - 6Hz, 6HzB flash - Busy output - OFF
MJE350G 特点
Figure 3 shows the proper connection of the MJE350G series voltage references with the optional trim resistor for initial error and the optional capacitor for noise reduction. The MJE350G reference has the ground terminal brought out on two pins (pin 4 and pin 7) which are connected together internally. This allows the user to achieve greater accuracy when using a socket. Voltage references have a voltage drop across their power supply ground pin due to quiescent current flowing through the contact resistance. If the contact resistance was constant with time and temperature, this voltage drop could be trimmed out. When the reference is plugged into a socket, this source of error can be as high as 20ppm. By connecting pin 4 to the power supply ground and pin 7 to a high impedance ground point in the measurement circuit, the error due to the contact resistance can be eliminated. If the unit is soldered into place, the contact resistance is sufficiently small that it does not effect performance. Pay careful attention to the circuit layout to avoid noise pickup and voltage drops in the lines.
MJE350G 应用
Sync detect C Output to signal when the link is active or inactive. The link is considered to be active when DE is actively switching. The TFP401/401A monitors the state DE to determine link activity. SCDT can be tied externally to PDO to power down the output drivers when the link is inactive.