LTC6404 Linear Technology, LTC6404 Datasheet - Page 16

• Manufacturer Part Number: LTC6404
• Description: High Precision Fully Differential Input/Output Amplifier/Driver
• Manufacturer: Linear Technology

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LTC6404
LTC6404-4 TYPICAL PERFORMANCE CHARACTERISTICS
PIN FUNCTIONS
SHDN (Pin 1): When SHDN is fl oating or directly tied to
V
When Pin 1 is pulled a minimum of 2.1V below V
LTC6404 enters into a low power shutdown state. See
Applications Information for more details.
V
Pins. Three pairs of power supply pins are provided to keep
the power supply inductance as low as possible to prevent
degradation of amplifi er 2nd harmonic performance. See
the Layout Considerations section for more detail.
16
+
+
, the LTC6404 is in the normal (active) operating mode.
, V
–
(Pins 2, 10, 11 and Pins 3, 9, 12): Power Supply
–100
–120
–140
100
–60
–80
–20
–40
10
1
0
0.01
0
LTC6404-4 Driving LTC2207
16-Bit ADC (Single Tone)
Voltage Noise Density vs
Frequency
0.1
10
DIFFERENTIAL INPUT
COMMON MODE
FREQUENCY (MHz)
FREQUENCY (MHz)
REFERRED
20
1
V
V
R
T
V
V
V
R
10.1MHz, 64k POINT FFT
f
FUNDAMENTAL = –1dBFS
HD2 = –98.9dBc
HD3 = –99.6dBc
CM
S
A
I
SAMPLE
S
OUTDIFF
CM
= 100Ω, R
I
= 3V
= 25°C
= 100Ω, R
= 3.3V
= V
= V
OCM
10
30
OCM
= 105Msps
= 2V
= MID-SUPPLY
F
= 1.25V
F
= 402Ω
P-P
= 402Ω
100
40
64044 G21
64044 G19
1000
50
+
, the
V
The voltage on V
voltage level (which is defi ned as the average of the volt-
ages on the OUT
midpoint of an internal resistive voltage divider between
the supplies, developing a (default) mid-supply voltage
potential to maximize output signal swing. In general, the
V
ence capable of driving the input impedance presented
by the V
input resistance of approximately 23.5k to a mid-supply
OCM
OCM
–100
–120
–140
(Pin 4): Output Common Mode Reference Voltage.
–20
–40
–60
–80
pin can be overdriven by an external voltage refer-
28
24
20
16
12
8
4
0
0
OCM
10
0
LTC6404-4 Driving LTC2207
16-Bit ADC (Two Tones)
LTC6404-4 Noise Figure vs
Frequency
IMD3L
V
V
T
SEE FIGURE 2 CIRCUIT
CM
S
A
= 3V
= 25°C
= V
pin. On the LTC6404-1, the V
10
OCM
+
FREQUENCY (MHz)
FREQUENCY (MHz)
= MID-SUPPLY
OCM
IMD3U
and OUT
20
V
V
V
R
64k POINT FFT
f
9.5MHz, 10.5MHz = –7dBFS
IMD3L = –100.8dBc
IMD3U = –102dBc
SAMPLE
S
OUTDIFF
CM
I
= 100Ω, R
= 3.3V
100
sets the output common mode
= V
OCM
30
= 105Msps
= 2V
–
= 1.4V
F
P-P
pins). The V
= 402Ω
40
64044 G20
64044 G22
1000
50
OCM
OCM
pin is the
pin has a
6404f