Rainbow Electronics U2741B - Manual (Page 3)

3
U2741B
4733A–RKE–11/03
Pin Configuration
Figure 3. Pinning SSO16
VCC
CLK
GND
LFVCC
LFGND
LF
ASK
FSK
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
PWRVCC
ANT
PWRGND1
PWRGND2
XTO1
XTO2
DIVIC
PWRSET
U2741B
Pin Description
Pin Symbol Function
1 ASK Modulation input ASK
2 FSK Modulation input FSK
3 VCC Supply voltage
4 CLK Clock output
5 GND Ground
6 LFVCC Supply voltage VCO
7 LFGND VCO ground
8 LF Circuit PLL loop
9 XTO2 FM modulation output
10 XTO1 Connection for crystal
11 PWRGND2 Power GND2
12 PWRGND1 Power GND1
13 ANT RF output
14 PWRVCC Supply voltage power amplifier
15 PWRSET Applied to VCC
16 DIVIC
Pitch factor setting for crystal
L: high crystal frequency
H: low crystal frequency