Datasheet

LTC6409
8
6409fa
pin FuncTions
+IN, –IN (Pins 2, 6): Non-Inverting and Inverting Input Pins.
SHDN (Pin 3): When SHDN is floating or directly tied to
V
+
, the LTC6409 is in the normal (active) operating mode.
When the SHDN pin is connected to V
–
, the part is disabled
and draws approximately 100µA of supply current.
V
+
, V
–
(Pins 4, 9 and Pins 8, 10): Positive and Negative
Power Supply Pins. Similar pins should be connected to
the same voltage.
V
OCM
(Pin 5): Output Common Mode Reference Voltage.
The voltage on this pin sets the output common mode
voltage level. If left floating, an internal resistor divider
develops a default voltage of 1.25V with a 5V supply.
+OUT, –OUT (Pins 7, 1): Differential Output Pins.
Exposed Pad (Pin 11): Tie the bottom pad to V
–
. If split
supplies are used, DO NOT tie the pad to ground.
Intermodulation Distortion vs
Frequency
Intermodulation Distortion vs
Output Common Mode Voltage
Intermodulation Distortion vs
Input Amplitude
Typical perForMance characTerisTics
–50
–60
–70
–80
–90
–120
–110
–100
FREQUENCY (MHz)
6409 G25
THIRD ORDER IMD (dBc)
V
S
= 5V
V
OCM
= V
ICM
= 1.25V
R
LOAD
= 400Ω
R
I
= R
F
= 150Ω
2 TONES, 200kHz TONE
SPACING, 2V
P-P
COMPOSITE
DIFFERENTIAL INPUTS
10 1000100
V
S
= 5V
V
OCM
= V
ICM
= 1.25V
R
LOAD
= 400Ω
R
I
= R
F
= 150Ω
V
OUTDIFF
= 2V
P-P
SINGLE-ENDED INPUT
0.5 3.532.521.51
OUTPUT COMMON MODE VOLTAGE (V)
6409 G26
THIRD ORDER IMD (dBc)
V
S
= 5V
f
IN
= 100MHz
R
LOAD
= 400Ω
R
I
= R
F
= 150Ω
2 TONES, 200kHz TONE
SPACING, 2V
P-P
COMPOSITE
DIFFERENTIAL INPUTS
–30
–40
–50
–60
–70
–80
–90
–110
–100
INPUT AMPLITUDE (dBm)
–80
–90
–120
–110
–100
2
(0.8V
P-P
)
10
(2V
P-P
)
864
6409 G27
THIRD ORDER IMD (dBc)
V
S
= 5V
V
OCM
= V
ICM
= 1.25V
f
IN
= 100MHz
R
LOAD
= 400Ω
R
I
= R
F
= 150Ω
2 TONES, 200kHz TONE SPACING
DIFFERENTIAL INPUTS
Harmonic Distortion vs Frequency
Harmonic Distortion vs Output
Common Mode Voltage
Harmonic Distortion vs Input
Amplitude
FREQUENCY (MHz)
6409 G22
DISTORTION (dBc)
V
S
= 5V
V
OCM
= V
ICM
= 1.25V
R
LOAD
= 400Ω
R
I
= R
F
= 150Ω
V
OUTDIFF
= 2V
P-P
SINGLE-ENDED INPUT
–50
–60
–70
–80
–90
–120
–110
–100
1 1000 10010
HD2
HD3
OUTPUT COMMON MODE VOLTAGE (V)
6409 G23
DISTORTION (dBc)
–30
–40
–50
–60
–70
–80
–90
–110
–100
0.5 3.532.521.51
V
S
= 5V
f
IN
= 100MHz
R
LOAD
= 400Ω
R
I
= R
F
= 150Ω
V
OUTDIFF
= 2V
P-P
SINGLE-ENDED INPUT
HD2
HD3
INPUT AMPLITUDE (dBm)
6409 G24
DISTORTION (dBc)
–80
–90
–120
–110
–100
–4
(0.4V
P-P
)
–2 10
(2V
P-P
)
86420
V
S
= 5V
V
OCM
= V
ICM
= 1.25V
f
IN
= 100MHz
R
LOAD
= 400Ω
R
I
= R
F
= 150Ω
SINGLE-ENDED INPUT
HD2
HD3