Rainbow Electronics ATA5757 - Manual (Page 2)

2
ATA5756/ATA5757 [Preliminary]
4702D–RKE–02/04
Pin Configuration
Figure 2. Pinning MSOP10
1
2
3
4
10
9
8
7
CLK
ASK
FSK
ANT2
ENABLE
GND
VS
XTO1
ATA5756
ATA5757
5 ANT1 6 XTO2
Pin Description
Pin Symbol Function Configuration
1 CLK
Clock output signal for the
microcontroller.
The clock output frequency is set by the
crystal to f
XTAL
/8.
The CLK output stays Low in power-
down mode and after enabling of the
PLL.
The CLK output switches on if the
oscillation amplitude of the crystal has
reached a certain level.
2 ASK
Switches on the power amplifier for
ASK modulation and enables the PLL
and XTO if the ENABLE pin is open
3 FSK
Switches off the FSK switch (switch has
high Z if signal at pin FSK is High) and
enables the PLL and the XTO if the
ENABLE pin is open
CLK
VS
100
100
200k
ASK 50k V
Ref
= 1.1V
20 µA
200k
FSK 200k V
Ref
= 1.1V
5 µA
200k