LT5525 Ver la hoja de datos (PDF) - Linear Technology
Número de pieza
componentes Descripción
Fabricante
LT5525 Datasheet PDF : 12 Pages
| |||
LT5525
TEST CIRCUITS
LOIN
1760MHz
RFIN
1900MHz
C1
OPTIONAL
16 15 14 13
1 17 NC LO+ LO– NC
12
NC
GND
2 RF+
IF+ 11
3 RF–
4
NC
LT5525
IF– 10
9
GND
EN VCC1 VCC2 NC
5 6 78
EN
900MHz INPUT MATCHING:
C2
C1: 3.9pF
RF
0.018" ER = 4.4 GND
0.062"
DC
0.018"
GND
L3
T2
C4 1
5
C3
2
L2
3
4
IFOUT
140MHz
VCC
5526 F01
C8
REF DES
C1
C2
C3
C4
C8
L2, L3
T2
VALUE
—
0.01µF
1.2pF
100pF
1µF
150nH
4:1
SIZE
0402
0402
0402
0402
0603
1608
SM-22
PART NUMBER
Frequency Dependent
AVX 04023C103JAT
AVX 04025A1R2BAT
AVX 04025A101JAT
Taiyo Yuden LMK107BJ105MA
Toko LL1608-FSR15J
M/A-COM ETC4-1-2
Figure 1. Test Schematic
APPLICATIO S I FOR ATIO
The LT5525 consists of a double-balanced mixer, RF
balun, RF buffer amplifier, high speed limiting LO buffer
and bias/enable circuits. The IC has been optimized for
downconverter applications with RF input signals from
0.8GHz to 2.5GHz and LO signals from 500MHz to 3GHz.
With proper matching, the IF output can be operated at
frequencies from 0.1MHz to 1GHz. Operation over a
wider frequency range is possible, though with reduced
performance.
The RF, LO and IF ports are all differential, though the RF
and LO ports are internally matched to 50Ω for single-
ended drive. The LT5525 is characterized and production
tested using single-ended RF and LO inputs. Low side or
high side LO injection can be used.
RF Input Port
The mixer’s RF input, shown in Figure 2, consists of an
integrated balun and a high linearity differential amplifier.
The primary terminals of the balun are connected to the
RF+ and RF– pins (Pins 2 and 3, respectively). The second-
ary side of the balun is internally connected to the amplifier’s
differential inputs.
For single-ended operation, the RF+ pin is grounded and
the RF– pin becomes the RF input. It is also possible to
ground the RF– pin and drive the RF+ pin, if desired. If the
RF source has a DC voltage present, then a coupling
capacitor must be used in series with the RF input pin.
Otherwise, excessive DC current could damage the pri-
mary winding of the balun.
5525f
7
Share Link: 