lt5557 Linear Technology Corporation, lt5557 Datasheet - Page 8

• Manufacturer Part Number: lt5557
• Description: 400mhz To 3.8ghz 3.3v High Linearity Downconverting Rf Mixer
• Manufacturer: Linear Technology Corporation

LT5557
TEST CIRCUITS
REF DES
C1
C2
C3
REF DES
C1, C3
C2
C6, C7
8
1000pF
1000pF
VALUE
VALUE
2.2pF
4.7pF
1μF
1μF
EXTERNAL MATCHING
FOR 450MHz, 900MHz
Figure 1. Standard Downmixer Test Schematic—Transformer-Based Bandpass IF Matching (240MHz IF)
FOR LO BELOW 1GHz
450MHz High Side 70MHz
900MHz Low Side 140MHz
LOW-PASS MATCH
2.6GHz
3.6GHz
RF
AND 3.6GHz RF
APPLICATION
0402
0603
0402
0402
0603
0402
SIZE
SIZE
LO
EXTERNAL MATCHING
FOR 450MHz, 900MHz
RF
LO
FOR LO BELOW 1GHz
Figure 2. Downmixer Test Schematic—Discrete IF Balun Matching (240MHz IF)
*HIGH-PASS MATCH
IN
LOW-PASS MATCH
360MHz
450MHz
IN
PART NUMBER
AVX 04025C102JAT
AVX 0603ZD105KAT
AVX 04025A2R2BAT
PART NUMBER
AVX 04025C102JAT
AVX 0603ZD105KAT
AVX 04025A4R7CAT
IF
AND 3.6GHz RF
FOR 2.6GHz RF
6.5mm
1.7mm
2.9mm
L (mm)
C5
C4
50Ω
HIGH-PASS*
L
Z
L4
RF MATCH
O
RF
RF
LO
IN
IN
IN
3.9pF
12pF
1pF
C5
EN
1
2
3
4
L5
3.6nH
NC
NC
RF
NC
L (mm)
C5
C4
2.7nH
10nH
50Ω
L4
Z
3.9pF
NC
EN
L4
–
–
LO MATCH
O
C5
16
5
V
LO
CC2
LT5557
6
8.2pF
3.9pF
15
C4
–
–
C1
V
EN
NC
CC1
1
2
3
4
14
7
NC
NC
RF
NC
270nH
180nH
47nH
39nH
NC
NC
L1
NC
EN
GND
GND
13
8
IF MATCH
IF –
IF
16
5
+
V
LO
12
11
10
9
CC2
LT5557
3.9pF
6
1.2pF
15pF
15
C3
REF DES
L4, C4, C5
L1
T1
REF DES
L4, C4, C5
L1, L2
L3
–
C1
V
NC
CC1
14
7
L3
NC
NC
GND
GND
13
8
IF –
IF
+
5557 F02
C2
12
11
10
9
DISCRETE
IF BALUN
L2
C6
C3
VALUE
VALUE
100nH
150nH
82nH
L1
C7
V
8:1
CC
(2.9V to 3.9V)
0.062"
C3
L1
0402
0603
0402
0603
0603
SIZE
SIZE
0.015"
0.015"
0.062"
5557 F01
C2
IF
240MHz
0.018"
0.018"
OUT
3
2
1
ε
R
•
V
= 3.7
T1
CC
PART NUMBER
See Applications Information
Toko LLQ1608-F82NG
Mini-Circuits TC8-1+
PART NUMBER
See Applications Information
Toko LL1608-FSLR10J
Toko LL1608-FSLR15J
ε
(2.9V to 3.9V)
•
R
4
6
= 4.4
RF
GND
BIAS
GND
RF
GND
BIAS
GND
DC1131A
BOARD
STACK-UP
(NELCO N4000-13)
IF
240MHz
OUT
DC910A
BOARD
STACK-UP
(FR-4)
5557fa