¡ Semiconductor
MSM7586-01/03
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VDDM, VDAM
+3 V power supply for the modem unit.
Supplied to the digital circuits through the VDDM pin and to the analog circuits through the
VDAM pin. VDDM and VDAM, and VDDC and VDAC should be connected as close as possible
on the PC board.
DGM, AGM
Ground pins for the modem unit.
DGM is the ground pin of the digital system, and AGM is the ground pin of the analog system.
Since DGM and AGM are isolated inside the IC, connect them as close as possible on the circuit
board.
MCK
Master clock input.
The clock frequency is 19.2 MHz.
IFIN
Modulated signal input for the demodulator block.
Select the IF frequency can be selected from 1.2 MHz, 10.7 MHz, 10.75 MHz, and 10.8 MHz, based
on CRM0 - B4 and B3.
IFCK
Clock frequency 19.0222 MHz input for demodulator block IF frequencies of 10.7 MHz.
If the IF frequency is 1.2 MHz or 10.8 MHz, set this pin to "0" or "1". (Refer to Fig. 2.)
X1, X2
Crystal oscillator connection pins.
When supplying a 19.0222 MHz clock to IFCK, use these pins. (Refer to Fig. 2.)
Figure 2 How to Use IFCK, X1, and X2
When IFIN = 10.7 MHz
MSM7586
X1
X2
IFCK
19.0222 MHz
When IFIN = 1.2 MHz or 10.8 MHz
MSM7586
X1
X2
IFCK
