Rainbow Electronics MAX2442 - Manual (Page 8)

MAX2440/MAX2441/MAX2442
900MHz Image-Reject Receivers
8 _______________________________________________________________________________________
Pin Description (continued)
Ground Connection for VCO and Phase Shifters 26 GND
Ground (substrate) 27 GND
Ground Connection for Master Bias Cell 28 GND
FUNCTION PIN NAME
V
CC
V CC
17
16
15
18
19
21
1000pF
VARACTOR:
ALPHA SMV1299-004
OR EQUIVALENT
RECEIVE IF OUTPUT (330 Ω)
SEE APPLICATIONS INFORMATION SECTION
L3: COILCRAFT 0805HS-060TMBC
27
23
26
3
12
20
22 1
28
RECEIVE
RF INPUT
5
9
7
6
0.01 µF
47pF
V CC V CC
0.1µF
V
CC
V
CC
2
47pF 0.1µF
8.2nH
12nH
47pF
47pF
47pF
8
11
0.01µF
47pF 0.01µF
MAX2440
MAX2441
MAX2442
6.8
3.3
3.3
L3
(nH)
PART
VCO TANK COMPONENTS FOR
915MHz TYPICAL RF
C26
(pF)
C2, C3
(pF)
1.8
3.6
3.0
3.3
4.0
4.0
R6, R7
( Ω)
10
15
15
47pF
14
RXIN
GND
GND
V CC
V
CC
GND
GND
13
GND
4
GND
GND
CAP1 V CC
V CC
GND
RXON
VCOON
DIV1
MOD
PREOUT
RXON
VCOON
DIV1
MOD
TO PLL
GND
RXOUT
GND
100nH
GND
PREGND
47pF
V CC
24
25
VCO
ADJUST
C3
1k
47k
47pF
1k
C2
R6
R7
V CC
L3 C26
TANK
LNAGAIN LNAGAIN
10
MAX2440
MAX2441
MAX2442
TANK
Figure 1. Typical Operating Circuit