LTC5540 データシートの表示（PDF） - Linear Technology
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LTC5540 Datasheet PDF : 16 Pages
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Block Diagram
20 19 18 16
21
IFBIAS IF+
IF– IFGND EXPOSED
PAD
IF
AMP
RF
2
LO
AMP
LO2
15
VCC3
14
CT
3
SHDN
5
PASSIVE
MIXER
BIAS
LOSEL
9
LO1
11
VCC2 6
VCC1 8
LOBIAS
7
GND PINS ARE
NOT SHOWN
5540 BD
LTC5540
Test Circuit
VCCIF
3.1V TO 5.3V
96mA
4:1
T1
C10
L1
L2
C9
C8
IFOUT
190MHz
50Ω
L3
R2
20 19
18 17
16
IFBIAS IF+
IF– GND IFGND
C4
1 NC
LO2 15
LO2IN
50Ω
C1
RFIN
50Ω
2 RF
C2
VCC3 14
C7
3 CT
LTC5540
GND 13
4 GND
SHDN
(0V/3.3V)
5 SHDN
VCC2
6
LOBIAS
7
VCC
3.1V TO 3.5V
97mA
C5
0.015”
0.062”
0.015”
GND 12
C3
VCC1
8
LOSEL
9
LO1 11
GND
10
C6
LOSEL
(0V/3.3V)
5541 TC
RF
GND DC1431A
BOARD
BIAS STACK-UP
GND (NELCO N4000-13)
LO1IN
50Ω
L1, L2 vs IF
Frequencies
IF (MHz)
L1, L2 (nH)
140
270
190
150
240
100
380
33
450
22
REF DES
VALUE
C3, C4
100pF
C6, C7, C8
22pF
C5, C9
1µF
C10
1000pF
L1, L2
150nH
L3
30nH
R2
2.05k
T1
TC4-1W-7ALN+
(Alternate) (WBC4-6TLB)
HIGH-SIDE LO
C1
5.6pF
C2
1.5pF
LOW-SIDE LO
C1, C2
100pF
SIZE COMMENTS
0402
AVX
0402
AVX
0603
AVX
0402
AVX
0603 Coilcraft 0603CS
0603 Coilcraft 0603CS
0402
Mini-Circuits
(Coilcraft)
0402
AVX
0402
AVX
0402
AVX
Figure 1. Standard Downmixer Test Circuit Schematic (190MHz IF)
5540f
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