targeted at processing signals from DC to 300MHz. The
part has been specifically designed to drive 12-, 14- and
16-bit ADCs with low noise and low distortion, but can also
be used as a general-purpose broadband gain block.
The LTC6400-26 is easy to use, with minimal support
circuitry required. The output common mode voltage is
set using an external pin, independent of the inputs, which
eliminates the need of transformers or AC-coupling ca-
pacitors in many applications. The gain is internally fixed
at 26dB (20V/V).
The LTC6400-26 saves space and power compared to
alternative solutions using IF gain blocks and transform-
ers. The LTC6400-26 is packaged in a compact 16-lead
3mm
×
3mm QFN package and operates over the –40°C
to 85°C temperature range.
L,
LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
1.9GHz –3dB Bandwidth
Fixed Gain of 20V/V (26dB)
–94dBc IMD3 at 70MHz (Equivalent OIP3 = 51dBm)
–71dBc IMD3 at 300MHz (Equivalent OIP3 = 39.5dBm)
1nV/√Hz Internal Op Amp Noise
1.5nV/√Hz Total Input Referred Noise
6.8dB Noise Figure
Differential Inputs and Outputs
50Ω Input Impedance
2.85V to 3.5V Supply Voltage
85mA Supply Current (255mW)
1V to 1.6V Output Common Mode, Adjustable
DC- or AC-Coupled Operation
Max Differential Output Swing 4.7V
P-P
Small 16-Lead 3mm
×
3mm
×
0.75mm QFN Package
APPLICATIONS
■
■
■
■
■
Differential ADC Driver
Differential Driver/Receiver
Single Ended to Differential Conversion
IF Sampling Receivers
SAW Filter Interfacing
TYPICAL APPLICATION
Single-Ended to Differential ADC Driver at 140MHz IF
3.3V
3.3V
60
50
0.1μF
1000pF
V
+
0.1μF
V
IN
150W
0.1μF
+IN
+OUT
24nH
15Ω
COILCRAFT
0603CS
1.25V
0.1μF
100Ω
33pF
33pF
10Ω
AIN
–
15Ω
10Ω
AIN
+
V
DD
LTC2208
V
CM
33pF
OUTPUT IP3 (dBm)
40
30
20
10
0
640026 TA01a
Equivalent OIP3 vs Frequency
DIFFERENTIAL INPUT
(NOTE 7)
LTC6400-26
–IN
–OUT
V
OCM
37.4Ω
V–
LTC2208
130Msps
16-BIT ADC
NO R
L
R
L
= 200Ω
0
50
100
150
200
FREQUENCY (MHz)
250
300
640026 TA01b
640026fa
1
LTC6400-26
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PIN CONFIGURATION
TOP VIEW
–IN
–IN
+IN
7
+OUTF
+IN
12 V–
17
11 ENABLE
10 V
+
9 V–
8
+OUT
16 15 14 13
V
+
V
+
1
3
5
–OUT
6
–OUTF
V
OCM
2
V– 4
Supply Voltage (V
+
– V
–
)..........................................3.6V
Input Current (Note 2)..........................................±10mA
Operating Temperature Range
(Note 3) ............................................... –40°C to 85°C
Specified Temperature Range
(Note 4) ............................................... –40°C to 85°C
Storage Temperature Range................... –65°C to 150°C
Maximum Junction Temperature........................... 150°C
UD PACKAGE
16-LEAD (3mm 3mm) PLASTIC QFN
T
JMAX
= 150°C,
θ
JA
= 68°C/W,
θ
JC
= 4.2°C/W
EXPOSED PAD (PIN 17) IS V
–
, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LTC6400CUD-26#PBF
LTC6400IUD-26#PBF
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
16-Lead (3mm
×
3mm) Plastic QFN
16-Lead (3mm
×
3mm) Plastic QFN
SPECIFIED TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
LTC6400CUD-26#TRPBF LCCX
LTC6400IUD-26#TRPBF LCCX
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard 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/
LTC6400 AND LTC6401 SELECTOR GUIDE
PART NUMBER
LTC6400-20
LTC6400-26
LTC6401-8
LTC6401-20
LTC6401-26
GAIN
(dB)
20
26
8
20
26
GAIN
(V/V)
10
20
2.5
10
20
Please check each datasheet for complete details.
Z
IN
(DIFFERENTIAL)
(Ω)
200
50
400
200
50
I
S
(mA)
90
85
45
50
45
In addition to the LTC6400 family of amplifiers, a lower power LTC6401 family is available. The LTC6401 is pin compatible to the LTC6400, and has the
same low noise performance. The lower power consumption of the LTC6401 comes at the expense of slightly higher non-linearity, especially at input
frequencies above 140MHz. Please refer to the separate LTC6401 data sheets for complete details. Other gain versions from 8dB to 14dB will follow.
640026fa
2
LTC6400-26
DC ELECTRICAL CHARACTERISTICS
+
The
●
–
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
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ST - Low Power RF
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