AN3956 Datasheet, PDF (3/14 Pages) Freescale Semiconductor, Inc – DEMOAPEXSENSOR Usage Altitude Pressure EXperimental (APEX) Sensor Board

AN3956
1
Operation
Operation
The TDA7491LP demonstration board specifications are as follows:
● Power supply voltage range: 5 V to 14V
● Number of channels: 2 BTL (bridge-tied load) stereo
● Load impedance: 4 Ω to 8 Ω
● Gain settings: 20 dB, 26 dB, 30 dB, 32 dB
● Undervoltage protection (UVP): 4 V
1.1
Note:
Power supply
A single power supply is required to feed the TDA7491LP demonstration board via the
connector J2 (see Figure 2).
Connect the positive voltage of the 15 V/3 A DC power supply to the +Vcc pin and the
negative to GND.
Voltage range 5 V to 14 V = 3 A current capability
1.2
Demonstration board preparation
1. Ensure that the power supply is switched OFF.
2. Connect the regulated power supply, adjusted in the device operating range, to the
connector J7(Vcc) - J8(GND) (observe the polarity).
1.3
Inputs and outputs
1. Connect the loads across the connectors J5-J6 (LEFT) and J9-J10 (RIGHT), the
specified impedance ranges from 4 to 8 Ω.
2. Connect the analog audio inputs, single-ended, to the L-input and R-input RCA plugs
(J1).
Refer to Figure 2: Demonstration board connections on page 4.
Doc ID 022034 Rev 1
3/14