LTC6400-8 Linear Technology, LTC6400-8 Datasheet - Page 5

• Manufacturer Part Number: LTC6400-8
• Description: Low Distortion Differential ADC Driver
• Manufacturer: Linear Technology

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AC ELECTRICAL CHARACTERISTICS
ENABLE = 0V, No R
SYMBOL
P1dB,140M
NF140M
e
e
240MHz Input Signal
HD2,240M/
HD3,240M
IMD3,240M
OIP3,240M
P1dB,240M
NF240M
e
e
300MHz Input Signal
HD2,300M/
HD3,300M
IMD3,300M
OIP3,300M
P1dB,300M
NF300M
e
e
IMD3,280M/320M
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: Input pins (+IN, –IN) are protected by steering diodes to either
supply. If the inputs go beyond either supply rail, the input current should
be limited to less than 10mA.
Note 3: The LTC6400C and LTC6400I are guaranteed functional over the
operating temperature range of –40°C to 85°C.
Note 4: The LTC6400C is guaranteed to meet specifi ed performance from
0°C to 70°C. It is designed, characterized and expected to meet specifi ed
IN,140M
ON,140M
N, 240M
ON,240M
N,300M
ON,300M
L
PARAMETER
1dB Compression Point
Noise Figure
Input Referred Voltage Noise Density
Output Referred Voltage Noise Density
Second-Order Harmonic Distortion
Third-Order Intermodulation
(f1 = 239.5MHz f2 = 240.5MHz)
Third-Order Output Intercept Point
(f1 = 239.5MHz f2 = 240.5MHz)
1dB Compression Point
Noise Figure
Input Referred Voltage Noise Density
Output Referred Voltage Noise Density
Second-Order Harmonic Distortion
Third-Order Intermodulation
(f1 = 299.5MHz f2 = 300.5MHz)
Third-Order Output Intercept Point
(f1 = 299.5MHz f2 = 300.5MHz)
1dB Compression Point
Noise Figure
Input Referred Voltage Noise Density
Output Referred Voltage Noise Density
Third-Order Intermodulation
(f1 = 280MHz f2 = 320MHz) Measured
at 360MHz
unless otherwise noted.
CONDITIONS
R
R
Includes Resistors (Short Inputs)
Includes Resistors (Short Inputs)
2V
2V
2V
2V
2V
R
R
Includes Resistors (Short Inputs)
Includes Resistors (Short Inputs)
2V
2V
2V
2V
2V
R
R
Includes Resistors (Short Inputs)
Includes Resistors (Short Inputs)
2V
L
S
L
S
L
S
P-P ,OUT
P-P ,OUT
P-P ,OUT
P-P ,OUT
P-P ,OUT
P-P ,OUT
P-P ,OUT
P-P ,OUT
P-P ,OUT
P-P ,OUT
P-P ,OUT
= 375Ω (Notes 5, 7)
= 375Ω (Notes 5, 7)
= 375Ω (Notes 5, 7)
= 400Ω, R
= 400Ω, R
= 400Ω, R
, R
, No R
, R
, No R
Composite, R
Composite, No R
Composite, No R
Composite, R
Composite, No R
Composite, No R
Composite, R
Specifi cations are at T
L
L
= 200Ω
= 200Ω
L
L
L
L
L
= 375Ω
= 375Ω
= 375Ω
performance from –40°C to 85°C but is not tested or QA sampled at these
temperatures. The LTC6400I is guaranteed to meet specifi ed performance
from –40°C to 85°C.
Note 5: Input and output baluns used. See Test Circuit A.
Note 6: Measured using Test Circuit B. R
Note 7: Since the LTC6400-8 is a feedback amplifi er with low output
impedance, a resistive load is not required when driving an AD converter.
Therefore, typical output power is very small. In order to compare the
LTC6400-8 with amplifi ers that require 50Ω output load, the LTC6400-8
output voltage swing driving a given R
if it were driving a 50Ω load. Using this modifi ed convention, 2V
defi nition equal to 10dBm, regardless of actual R
L
L
L
= 200Ω
= 200Ω
= 375Ω
L
L
L
L
(Note 7)
(Note 7)
A
= 25°C. V
MIN
+
= 3V, V
L
is converted to OIP3 and P1dB as
L
= 87.5Ω per output.
–
–71/–53
–73/–59
–67/–46
–69/–50
= 0V, V
19.2
37.8
18.2
34.8
17.6
TYP
–64
–68
–57
–61
–59
7.7
3.7
9.3
8.1
3.7
9.6
8.5
3.8
10
LTC6400-8
L
.
OCM
= 1.25V,
MAX
–53
P-P
nV/√Hz
nV/√Hz
nV/√Hz
nV/√Hz
nV/√Hz
nV/√Hz
is by
UNITS
64008f
5
dBm
dBm
dBm
dBm
dBm
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dB
dB
dB