MAX2426(1999) 查看數據表（PDF） - Maxim Integrated
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MAX2426 Datasheet PDF : 14 Pages
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900MHz Image-Reject Receiver
with Transmit Mixer
0.1µF
RECEIVE
RF INPUT 8.2nH
0.1µF
12nH
VCC
47pF
47pF
1
VCC
28
GND
2 CAP1
5
RXIN
47pF
VCC
MAX2424
MAX2426
VCC
PREGND
VCC
GND
GND
RXOUT
VCC
22
47pF
20
VCC
23
47pF
26
27
0.01µF
3
47pF
TRANSMIT
RF OUTPUT
47pF
22nH
18nH
9 TXOUT
12
TXIN
13
TXIN
0.01µF
VCO TANK COMPONENTS
FOR 915MHz RF FREQUENCY
DEVICE
L3 C2, C3 C26 R6, R7
(nH) (pF) (pF) (Ω)
MAX2424 6.8 3.3 2.0 10
MAX2426 3.3 8.0 4.0 20
RECEIVE IF OUTPUT (330Ω)
0.01µF*
MODULATOR INPUT
10k
RA
RB VCC
10k
0.01µF*
MODULATOR INPUT
0.01µF
47pF
VCC
47pF
6 VCC
7
GND
11 VCC
8
GND
25 R7
TANK
24 R6
TANK
VCC
100nH
VARACTORS:
ALPHA SMV1299-004
OR EQUIVALENT
1k
C2
47k
L3
C26
VCO
ADJUST
47pF
0.01µF
14
CAP2
47pF
LNAGAIN
10 LNAGAIN
47pF
4 GND
Figure 1. Typical Operating Circuit
PREOUT
MOD
1000pF
21
19
18
DIV1
VCOON 17
RXON 16
TXON 15
C3
1k
TO PLL
MOD
DIV1
VCOON
RXON
TXON
*WHEN USING DIFFERENTIAL
SOURCE, REMOVE RESISTORS
AND REPLACE CAPACITORS WITH
SHORTS. FOR SINGLE-ENDED
SOURCE, DRIVE ONLY MODULATOR
INPUT. CHOOSE RA AND RB VALUES
AS SHOWN IN TRANSMITTER SECTION.
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