Siemens ET7 Series Especificações descarregar pdf (Página 53)

DSB75 Development Support Board Rev. B1 Hardware Description

Strictly confidential / Released

DSB75_hd_v08 Page 53 of 94 29.09.2005

3.12 Analog Interface

The DSB75 provides an analog interface allowing you to efficiently evaluate the

characteristics of the analog baseband codec of the GSM module:

• This analog interface has 2 analog inputs and one analog output.

• The analog input lines are available on the pin header X101.

• The analog output is available as a pulse width modulation (PWM) signal on the pin

header X101.

• A filter circuit 2

order smoothes the PWM signal.

• The filter on the DSB75 is optimized for 8.125kHz PWM frequency and can be removed

by customer. Therefore the jumpers X560 - X562 have to be replaced by customer

circuit.

-90

-80

-70

-60

-50

-40

-30

-20

-10

0,1 1 10 100 1000 10000 100000

PWM frequency [Hz]

Filter attenuation [dB]

Figure 29 PWM filter characteristics

• For self test facilities it is possible to turn on test loops. Each analog input can be

connected to the filter output.

Figure 30 shows the placement of the related switches and the pin location.

Figure 31 shows the simplified interface schematic.

Electrical characteristics are specified in section 7.

X511

X551

X552

X101

X102

S201

S200 X554

X703

X561

X560

X562

S504

S503

S502

S501

S500

Figure 30: Analog interface location and related switches

1 2 ... 48 49 50 51 52 53 54 55 56 57 58 ... 93 94

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