LT5521 Datasheet, PDF (9/16 Pages) Linear Technology – Very High Linearity Active Mixer

BLOCK DIAGRA
17
16
15
EXPOSED GND LO
PAD
14
13
GND GND
GND
1
IN⁺
2
IN^–
3
GND
4
BIAS
EN
5
OUT⁺
12
GND
11
GND
10
OUT^–
9
V_CC
6
V_CC
7
V_CC
8
5521 BD
LT5521
TEST CIRCUITS
C2
IF_IN
Z3
50Ω
Z14
C6
C1
LO_IN
0.017" εr = 4.4
RF
GND
50Ω
0.062"
DC
Z1
0.017"
GND
OPT
16 15 14 13
T1
R1
GND L0 GND GND
1
GND
OUT^{+ 12}
L1
2 _IN+
LT5521
11
GND
C4
C13
3 _IN–
EXPOSED
10
GND
4
GND
PAD (17) _{OUT– 9}
L2
T2
C3
C12
R7
EN V_CC V_CC V_CC
Z7
56 7 8
OPT
R8
V_CC
C11
5521 F01
EN
Figure 1. Demonstration Board Schematic
Table 1. Demonstration Board Bill of Materials^{1, 2}
REF
R1, R7
f_IF = 250MHz, f_RF = 1.95GHz f_IF = 44MHz, f_RF = 1.045GHz f_IF = 250MHz, f_RF = 1.95GHz
f_LO = 1.7GHz, V_CC = 5V
f_LO = 1.001GHz, V_CC = 5V f_LO = 1.7GHz, V_CC = 3.3V
110Ω, 1%
110Ω, 1%
22.6Ω, 1%
Z14
10pF
120nH
10pF
Z3
0Ω
150pF
0Ω
L1, L2
T1
2.7nH
M/A-COM MABACT0010³
10nH
M/A-COM MABACT0010³
2.7nH
M/A-COM MABACT0010³
T2
M/A-COM ETC1.6-4-2-3
M/A-COM ETC1.6-4-2-3
M/A-COM ETC1.6-4-2-3
C1, C13
6.8pF
27pF
6.8pF
C3
82pF
3.9pF
82pF
C12
82pF
1nF
82pF
C2, C4, C6
1nF
1nF
1nF
C11
1µF
1µF
1µF
Z1, Z7
0Ω
0Ω
100nH
THIS COMPONENT CAN BE REPLACED BY PCB TRACE ON FINAL APPLICATION
R8
10k
10k
10k
Note 1: Tabulated values are used for characterization measurements.
Note 2: Components shown on the schematic are included for consistency with the demo board.
If no value is shown for the component, the site is unpopulated.
Note 3: T1 also M/A-COM ETC1-1-13 and Sprague Goodman GLSW4M202. These alternative transformers
have been measured and have similar performance.
RF_OUT
50Ω
5521f
9