AN2725 datasheet(2/8 Pages) STMICROELECTRONICS

2 / 8 page

Description of the demonstration board

AN2725

2/8

Doc ID 14535 Rev 1

Description of the demonstration board

The STEVAL-CCA007V1 is designed to evaluate the TS2012, a fully-differential class D

stereo power amplifier. The TS2012 device, available in a QFN package, is mounted on a

two-layer PCB with a copper area acting as a heatsink. Easily-accessible on-board

connectors are used to change or drive the gain select pins (G0 and G1) and the standby

control pins. The input configuration of the TS2012 can also be changed.

The differential gain of the TS2012 can be set to 6, 12 18, or 24 dB, depending on the logic

level of the G0 pin (connected to pin 2 of the P3) and G1 pin (connected to pin 2 of the P2).

Note:

There is an internal 300 k

Ω (+/-20%) resistor between pins G0, G1 and GND. When the

pins are floating (P2 and P3 included), the gain is 6 dB. In full standby mode (left and right

channels OFF), these resistors are disconnected (HiZ input).

The input configuration is either capacitor-coupled or common-mode feedback. On the

board, the connectors for the left channel (P13 and P14) and those for the right channel

(P23 and P24) allow you to change the input configuration.

In the capacitor-coupled configuration, the -3 dB cut-off frequency FC in Hz is:

with Zin in Ω (Zin= 30 kΩ typically), Cin in Farads, C13 = C14 and C23 = C24.

Note:

On the TS2012 demonstration board Cin = C13 = C14 = C23 = C24 = 220 nF, which means

that FC = 24.1 Hz for both channels.

More information on component calculations is available in the TS2012 datasheet.

Table 1.

Gain settings with G0 and G1 pins

Gain (dB)

Gain (V/V)

π Z

⋅⋅

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AN2725 Datasheet(PDF) 2 Page - STMicroelectronics