lt5521 Linear Technology Corporation, lt5521 Datasheet - Page 8

• Manufacturer Part Number: lt5521
• Description: Very High Linearity Active Mixer
• Manufacturer: Linear Technology Corporation

PI FU CTIO S
TYPICAL AC PERFOR A CE CHARACTERISTICS
LT5521
= –5dBm, V
frequency and V
GND (Pins 1, 4, 10, 11, 13, 14, 16): Ground. These pins
are internally connected to the Exposed Pad for improved
isolation. They should be connected to RF ground on the
printed circuit board, and are not intended to replace the
primary grounding through the backside of the package.
IN
requires a resistive DC path to ground. See Applications
Information for choosing the resistor value. External match-
ing is required.
EN (Pin 5): Enable Input Pin. The enable voltage should be
at least 2.9V to turn the chip on and less than 0.2V to turn
the chip off.
8
–44
+
–30
–32
–34
–36
–38
–40
–42
–32
–33
–34
–35
–36
–37
–38
–39
–40
U
, IN
1500
–25
LO-RF Leakage vs LO Power
LO-RF Leakage vs LO Frequency
–40 C
–
1550
–20
(Pins 2, 3): Differential Input Pins. Each pin
U
CC
85 C
25 C
–40 C
1600
= 3.3V, EN = 2.9V, T
–15
LO FREQUENCY (MHz)
CC
85 C
LO POWER (dBm)
1650
= 3.3V.
–10
25 C
1700
U
–5
1750
0
1800
1850
A
5
5521 G30
5521 G28
= 25 C, unless otherwise noted. Test circuit shown in Figure 1 is tuned for 1.95GHz output
W U
1900
10
–2
4
8
6
0
2
3.10
Conversion Gain, IIP3 and Noise
Figure vs Supply Voltage
22
20
18
16
14
12
10
3.15
–20
Noise Figure vs LO Power
G
85 C
25 C
–40 C
C
3.20
–15
3.25
V
LO POWER (dBm)
CC
3.30
–10
(V)
3.35
V
for these three pins is 40mA.
OUT
have a DC connection to the supply voltage (see Applica-
tions Information). These pins draw 20mA each. External
matching is required.
LO (Pin 15): Local Oscillator Input. This input is internally
DC biased to 0.96V. Input signal must be AC coupled.
Exposed Pad (Pin 17): Circuit Ground Return for the
Entire IC. For best performance, this pin must be soldered
to the printed circuit board.
CC
–5
3.40
–40 C
(Pins 6, 7, 8): Power Supply Pins. Total current draw
IIP3
+
NF
85 C
25 C
, OUT
5521 G31
3.45
0
3.50
–
5521 G32
20
16
4
24
12
8
(Pins 12, 9): RF Output Pins. These pins must
5
f
LO
= 1.7GHz, f
10
–2
–4
8
6
4
2
0
–25
Conversion Gain and IIP3
vs LO Power
–20
–23
–26
–29
–32
–35
–38
–41
–44
–47
–50
3.0
–20
LO Leakage vs Supply Voltage
85 C
25 C
–40 C
IF
–15
3.1
= 250MHz, f
LO POWER (dBm)
–10
3.2
G
C
V
–5
CC
3.3
IIP3
RF
(V)
= 1.95GHz, P
0
3.4
–40 C
85 C
5
5521 G29
3.5
25 C
10
5521 G33
27
25
21
19
17
13
23
15
5521f
LO
3.6