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LTC6409CUDB#TRPBF

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LTC6409
1
6409fa
LTC6409 Driving LTC2262-14 ADC,
f
IN
= 70MHz, –1dBFS,
f
S
= 150MHz, 4096-Point FFT
Typical applicaTion
DescripTion
10GHz GBW, 1.1nV/√Hz
Differential Amplifier/ADC
Driver
The LTC
®
6409 is a very high speed, low distortion, dif-
ferential amplifier. Its input common mode range includes
ground, so that a ground-referenced input signal can be
DC-coupled, level-shifted, and converted to drive an ADC
differentially.
The gain and feedback resistors are external, so that the
exact gain and frequency response can be tailored to each
application. For example, the amplifier could be externally
compensated in a no-overshoot configuration, which is
desired in certain time-domain applications.
The LTC6409 is stable in a differential gain of 1. This al-
lows for a low output noise in applications where gain is
not desired. It draws 52mA of supply current and has a
hardware shutdown feature which reduces current con-
sumption to 100µA.
The LTC6409 is available in a compact 3mm × 2mm 10-pin
leadless QFN package and operates over a –40°C to 125°C
temperature range.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
DC-Coupled Interface from a Ground-Referenced Single-Ended
Input to an LTC2262-14 ADC
FeaTures
applicaTions
n
10GHz Gain-Bandwidth Product
n
88dB SFDR at 100MHz, 2V
P-P
n
1.1nV/√Hz Input Noise Density
n
Input Range Includes Ground
n
External Resistors Set Gain (Min 1V/V)
n
3300V/µs Differential Slew Rate
n
52mA Supply Current
n
2.7V to 5.25V Supply Voltage Range
n
Fully Differential Input and Output
n
Adjustable Output Common Mode Voltage
n
Low Power Shutdown
n
Small 10-Lead 3mm × 2mm × 0.75mm QFN Package
n
Differential Pipeline ADC Driver
n
High-Speed Data-Acquisition Cards
n
Automated Test Equipment
n
Time Domain Reflexometry
n
Communications Receivers
+
–
–
+
150Ω
1.3pF
LTC6409
V
OCM
= 0.9V
V
IN
33.2Ω
33.2Ω
10Ω
10Ω
150Ω
150Ω
150Ω
6409 TA01
A
IN
+
A
IN
–
LTC2262-14 ADC
GND
V
DD
1.8V
3.3V
1.3pF
39pF
39pF
FREQUENCY (MHz)
6409 TA01b
AMPLITUDE (dBFS)
0
–80
–70
–60
–50
–40
–30
–20
–10
–90
–100
–110
–120
0 704010 5020 6030
V
S
= 3.3V
V
OUTDIFF
= 1.8V
P-P
HD2 = –86.5dBc
HD3 = –89.4dBc
SFDR = 81.6dB
SNR = 71.1dB
LTC6409
2
6409fa
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
OSDIFF
Differential Offset Voltage (Input Referred) V
S
= 3V
V
S
= 3V
V
S
= 5V
V
S
= 5V
l
l
±300
±300
±1000
±1200
±1100
±1400
µV
µV
µV
µV
ΔV
OSDIFF
ΔT
Differential Offset Voltage Drift (Input Referred) V
S
= 3V
V
S
= 5V
l
l
2
2
µV/°C
µV/°C
I
B
Input Bias Current (Note 6) V
S
= 3V
V
S
= 5V
l
l
–140
–160
–62
–70
0
0
µA
µA
I
OS
Input Offset Current (Note 6) V
S
= 3V
V
S
= 5V
l
l
±2
±2
±10
±10
µA
µA
R
IN
Input Resistance Common Mode
Differential Mode
165
860
kΩ
Ω
C
IN
Input Capacitance Differential Mode 0.5 pF
e
n
Differential Input Noise Voltage Density f = 1MHz, Not Including R
I
/R
F
Noise 1.1 nV/√Hz
i
n
Input Noise Current Density f = 1MHz, Not Including R
I
/R
F
Noise 8.8 pA/√Hz
NF Noise Figure at 100MHz Shunt-Terminated to 50Ω, R
S
= 50Ω, R
I
= 25Ω,
R
F
= 10kΩ
6.9 dB
pin conFiguraTionabsoluTe MaxiMuM raTings
Total Supply Voltage (V
+
– V
–
) .................................5.5V
Input Current (+IN, –IN, V
OCM
, SHDN)
(Note 2) ................................................................±10mA
Output Short-Circuit Duration (Note 3) ............ Indefinite
Operating Temperature Range
(Note 4) .................................................. –40°C to 125°C
Specified Temperature Range
(Note 5) .................................................. –40°C to 125°C
Maximum Junction Temperature .......................... 150°C
Storage Temperature Range .................. –65°C to 150°C
TOP VIEW
UDB PACKAGE
10-LEAD (3mm × 2mm) PLASTIC QFN
–OUT
+IN
+OUT
–IN
V
–
V
+
V
–
SHDN
V
+
V
OCM
7
11,V
–
6
10 9 8
1
2
3 4 5
T
JMAX
= 150°C, θ
JA
= 138°C/W, θ
JC
= 5.2°C/W
EXPOSED PAD (PIN 11) CONNECTED TO V
–
orDer inForMaTion
elecTrical characTerisTics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
+
= 5V, V
–
= 0V, V
CM
= V
OCM
= V
ICM
= 1.25V, V
SHDN
= open. V
S
is
defined as (V
+
– V
–
). V
OUTCM
is defined as (V
+OUT
+ V
–OUT
)/2. V
ICM
is defined as (V
+IN
+ V
–IN
)/2. V
OUTDIFF
is defined as (V
+OUT
– V
–OUT
).
(Note 1)
Lead Free Finish
TAPE AND REEL (MINI) TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE
LTC6409CUDB#TRMPBF LTC6409CUDB#TRPBF LFPF
10-Lead (3mm × 2mm) Plastic QFN
0°C to 70°C
LTC6409IUDB#TRMPBF LTC6409IUDB#TRPBF LFPF
10-Lead (3mm × 2mm) Plastic QFN
–40°C to 85°C
LTC6409HUDB#TRMPBF LTC6409HUDB#TRPBF LFPF
10-Lead (3mm × 2mm) Plastic QFN
–40°C to 125°C
TRM = 500 pieces. *Temperature grades are identified by a label on the shipping container.
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
LTC6409
3
6409fa
elecTrical characTerisTics
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
e
nVOCM
Common Mode Noise Voltage Density f = 10MHz 12 nV/√Hz
V
ICMR
(Note 7)
Input Signal Common Mode Range V
S
= 3V
V
S
= 5V
l
l
0
0
1.5
3.5
V
V
CMRRI
(Note 8)
Input Common Mode Rejection Ratio
(Input Referred) ΔV
ICM
/ΔV
OSDIFF
V
S
= 3V, V
ICM
from 0V to 1.5V
V
S
= 5V, V
ICM
from 0V to 3.5V
l
l
75
75
90
90
dB
dB
CMRRIO
(Note 8)
Output Common Mode Rejection Ratio (Input
Referred) ΔV
OCM
/ΔV
OSDIFF
V
S
= 3V, V
OCM
from 0.5V to 1.5V
V
S
= 5V, V
OCM
from 0.5V to 3.5V
l
l
55
60
80
85
dB
dB
PSRR
(Note 9)
Differential Power Supply Rejection (ΔV
S
/ΔV
OSDIFF
) V
S
= 2.7V to 5.25V
l
60 85 dB
PSRRCM
(Note 9)
Output Common Mode Power Supply Rejection
(ΔV
S
/ΔV
OSCM
)
V
S
= 2.7V to 5.25V
l
55 70 dB
V
S
Supply Voltage Range (Note 10)
l
2.7 5.25 V
G
CM
Common Mode Gain (ΔV
OUTCM
/ΔV
OCM
) V
S
= 3V, V
OCM
from 0.5V to 1.5V
V
S
= 5V, V
OCM
from 0.5V to 3.5V
l
l
1
1
V/V
V/V
ΔG
CM
Common Mode Gain Error, 100 × (G
CM
– 1)
V
S
= 3V, V
OCM
from 0.5V to 1.5V
V
S
= 5V, V
OCM
from 0.5V to 3.5V
l
l
±0.1
±0.1
±0.3
±0.3
%
%
BAL Output Balance
(ΔV
OUTCM
/ ΔV
OUTDIFF
)
ΔV
OUTDIFF
= 2V
Single-Ended Input
Differential Input
l
l
–65
–70
–50
–50
dB
dB
V
OSCM
Common Mode Offset Voltage (V
OUTCM
– V
OCM
) V
S
= 3V
V
S
= 5V
l
l
±1
±1
±5
±6
mV
mV
ΔV
OSCM
ΔT
Common Mode Offset Voltage Drift
l
4 µV/°C
V
OUTCMR
(Note 7)
Output Signal Common Mode Range
(Voltage Range for the V
OCM
Pin)
V
S
= 3V
V
S
= 5V
l
l
0.5
0.5
1.5
3.5
V
V
R
INVOCM
Input Resistance, V
OCM
Pin
l
30 40 50 KΩ
V
OCM
Self-Biased Voltage at the V
OCM
Pin V
S
= 3V, V
OCM
= Open
V
S
= 5V, V
OCM
= Open
l
0.9
0.85
1.25
1.6
V
V
V
OUT
Output Voltage, High, Either Output Pin V
S
= 3V, I
L
= 0
V
S
= 3V, I
L
= –20mA
V
S
= 5V, I
L
= 0
V
S
= 5V, I
L
= –20mA
l
l
l
l
1.85
1.8
3.85
3.8
2
1.95
4
3.95
V
V
V
V
Output Voltage, Low, Either Output Pin V
S
= 3V, 5V; I
L
= 0
V
S
= 3V, 5V; I
L
= 20mA
l
l
0.06
0.2
0.15
0.4
V
V
I
SC
Output Short-Circuit Current, Either Output Pin
(Note 11)
V
S
= 3V
V
S
= 5V
l
l
±50
±70
±70
±95
mA
mA
A
VOL
Large-Signal Open Loop Voltage Gain 65 dB
I
S
Supply Current
l
52 56
58
mA
mA
I
SHDN
Supply Current in Shutdown V
SHDN
≤ 0.6V
l
100 500 µA
R
SHDN
SHDN Pull-Up Resistor V
SHDN
= 0V to 0.5V
l
115 150 185 KΩ
V
IL
SHDN Input Logic Low
l
0.6 V
V
IH
SHDN Input Logic High
l
1.4 V
t
ON
Turn-On Time 160 ns
t
OFF
Turn-Off Time 80 ns
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
+
= 5V, V
–
= 0V, V
CM
= V
OCM
= V
ICM
= 1.25V, V
SHDN
= open. V
S
is
defined as (V
+
– V
–
). V
OUTCM
is defined as (V
+OUT
+ V
–OUT
)/2. V
ICM
is defined as (V
+IN
+ V
–IN
)/2. V
OUTDIFF
is defined as (V
+OUT
– V
–OUT
).
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LTC6409CUDB#TRPBF

Mfr. #:
Buy LTC6409CUDB#TRPBF
Manufacturer:
Analog Devices Inc.
Description:
High Speed Operational Amplifiers 10GHz GBW, 1.1nV/vHz Diff Amp/ADC Drvr
Lifecycle:
New from this manufacturer.
Delivery:
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