MAX2422 查看數據表（PDF） - Maxim Integrated
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MAX2422 Datasheet PDF : 14 Pages
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900MHz Image-Reject Transceivers
Pin Description (continued)
PIN
NAME
FUNCTION
22
VCC
Supply-Voltage Input for Prescaler. Bypass with a 47pF low-inductance capacitor and 0.01µF to GND
(pin 20 if possible).
23
VCC
Supply-Voltage Input for VCO and Phase Shifters. Bypass with a 47pF low-inductance capacitor to GND
(pin 26 if possible).
24
TANK
Differential Oscillator Tank Port. See Applications Information for information on tank circuits or on using
an external oscillator.
25
TANK
Differential Oscillator Tank Port. See Applications Information for information on tank circuits or on using
an external oscillator.
26
GND
Ground Connection for VCO and Phase Shifters
27
GND
Ground (substrate)
28
GND
Ground Connection for Master Bias Cell
RECEIVE
RF INPUT
TRANSMIT
RF OUTPUT
0.1µF
0.1µF
VCC
47pF
47pF
1
VCC
28
GND
2 CAP1
8.2nH
12nH
47pF
5
VCC
47pF
22nH
9
18nH
6
47pF
7
VCC
11
0.01µF
47pF
8
RXIN
TXOUT
VCC
GND
VCC
GND
MAX2420
MAX2421
MAX2422
MAX2460
MAX2463
0.01µF
14
CAP2
47pF
TXGAIN
LNAGAIN
4 TXGAIN
10 LNAGAIN
47pF
VCC
PREGND
VCC
GND
GND
RXOUT
TXIN
TANK
TANK
PREOUT
MOD
DIV1
VCOON
RXON
TXON
VCC
22
47pF
20
VCC
23
47pF
26
27
3
0.01µF
12
0.01µF
VCO TANK COMPONENTS FOR
915MHz TYPICAL RF
L3
0.01µF PART (nH)
MAX2420 6.8
C26 C2, C3 R6, R7
(pF) (pF) (Ω)
1.8 3.3 10
MAX2421 3.3 3.6 4.0 15
MAX2422 3.3 3.0 4.0 20
MAX2460 6.8 1.5 4.0 15
MAX2463 6.8 2.4 4.7 15
SEE APPLICATIONS INFORMATION SECTION
L3: COILCRAFT 0805HS-060TJBC
COILCRAFT 0805HS-030TJBC
RECEIVE IF OUTPUT (330Ω)
TRANSMIT IF INPUT (330Ω)
VCC
VARACTOR:
ALPHA SMV1299-004
OR EQUIVALENT
25
R7
L3
24 R6
100nH
C2
C26
1kΩ
47kΩ
VCO
ADJUST
47pF
1000pF
21
19
18
17
16
15
C3
1kΩ
TO PLL
MOD
DIV1
VCOON
RXON
TXON
Figure 1. Typical Operating Circuit
_______________________________________________________________________________________ 9
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