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LTC6420CUDC-20#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P14
LTC6420-20
1
642020fb
FEATURES
APPLICATIONS
DESCRIPTION
Dual Matched
1.8GHz Differential
Amplifi ers/ADC Drivers
The LTC
®
6420-20 is a dual high-speed differential amplifi er
targeted at processing signals from DC to 300MHz. The
part has been specifi cally 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 LTC6420-20 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 for transformers or AC-coupling
capacitors in many applications. The gain is internally
fi xed at 20dB (10V/V).
The LTC6420-20 saves space and power compared to
alternative solutions using IF gain blocks and transformers.
The LTC6420-20 is packaged in a compact 20-lead
3mm × 4mm QFN package and operates over the –40°C
to 85°C temperature range.
Distribution of Gain Match
n
Matched Gain ±0.1dB
n
Matched Phase ±0.1° at 100MHz
n
Channel Separation 80dB at 100MHz
n
1.8GHz –3dB Bandwidth; Fixed Gain of 10V/V (20dB)
n
IMD3 = –84dBc at 100MHz, 2V
P-P
n
Equivalent OIP3 = 46dBm at 100MHz
n
1nV/√Hz Internal Op Amp Noise
n
6.2dB Noise Figure
n
Differential Inputs and Outputs
n
Rail-to-Rail Output Swing
n
80mA Supply Current (240mW) per Amplifi er
n
1.1V to 1.6V Output Common Mode Voltage,
Adjustable
n
DC- or AC-Coupled Operation
n
20-Lead 3mm × 4mm × 0.75mm QFN Package
n
Differential ADC Driver
n
Single Ended to Differential Conversion
n
IF Sampling (Diversity) Receivers
n
Broadband I/Q Amplifi ers
n
Satellite Communications
Matched Dual Amplifi er with Output Common Mode Biasing
TYPICAL APPLICATION
CHANNEL-TO-CHANNEL GAIN MATCH (dB)
–0.25
UNITS (%)
40
35
30
15
20
25
10
5
0
–0.15 –0.05
642020 TA01b
0.05 0.15 0.25
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.
642020 TA01a
0.1µF
+OUT A
–OUT A
–IN A
+IN A
0.1µF
100Ω
100Ω
12.5Ω
12.5Ω
1000Ω
1000Ω
0.1µF
–OUT B
+OUT B
+IN B
–IN B
0.1µF
100Ω
100Ω
12.5Ω
12.5Ω
1000Ω
1000Ω
0.1µF
1000pF
0.1µF
1000pF
3V
3V
V+ A
V
OCM
A
V
OCM
A
ENABLEA
V+ B V
OCM
B
V
OCM
B
ENABLEB
Z
IN
= 200Ω
Z
IN
= 200Ω
V
OCM
A
V
OCM
A
V
OCM
B
V
OCM
B
±0.1dB GAIN MATCHING
±0.1° PHASE MATCHING AT 100MHz
V– V–
LTC6420-20
–
+
–
+
V
IN
A
V
IN
B
LTC6420-20
2
642020fb
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (V
+
– V
–
) .........................................3.6V
Input Current (Note 2) ..........................................±10mA
Operating Temperature Range (Note 3)...–40°C to 85°C
Specifi ed Temperature Range (Note 4) ....–40°C to 85°C
Storage Temperature Range ...................–65°C to 150°C
Maximum Junction Temperature........................... 150°C
Output Short Circuit Duration........................... Indefi nite
(Note 1)
20 19 18 17
7 8
TOP VIEW
21
V
–
UDC PACKAGE
20-LEAD (3mm × 4mm) PLASTIC QFN
9 10
6
5
4
3
2
1
11
12
13
14
15
16
+INA
–INA
V
–
V
–
–INB
+INB
–OUTA
V
+
A
V
–
V
–
V
+
B
–OUTB
V
+
A
V
OCMA
ENABLEA
+OUTA
V
+
B
V
OCMB
ENABLEB
+OUTB
T
JMAX
= 150°C, θ
JA
= 43°C/W, θ
JC
= 5°C/W
EXPOSED PAD (PIN 21) IS V
–
, MUST BE SOLDERED TO PCB
ORDER INFORMATION
PART NUMBER
GAIN
(dB)
GAIN
(V/V)
Z
IN
(DIFFERENTIAL)
(Ω)
SINGLE DUAL COMMENT
LTC6400-8 8 2.5 400 Lowest Distortion
LTC6400-14 14 5 200 Lowest Distortion
LTC6400-20 LTC6420-20 20 10 200 Lowest Distortion
LTC6400-26 26 20 50 Lowest Distortion
LTC6401-8 8 2.5 400 Lowest Power
LTC6401-14 14 5 200 Lowest Power
LTC6401-20 LTC6421-20 20 10 200 Lowest Power
LTC6401-26 26 20 50 Lowest Power
PIN CONFIGURATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE
LTC6420CUDC-20#PBF LTC6420CUDC-20#TRPBF LDDM
20-Lead (3mm × 4mm) Plastic QFN
0°C to 70°C
LTC6420IUDC-20#PBF LTC6420IUDC-20#TRPBF LDDM
20-Lead (3mm × 4mm) Plastic QFN
–40°C to 85°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi ed by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based fi nish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifi cations, go to: http://www.linear.com/tapeandreel/
SELECTOR GUIDE
LTC6420-20
3
642020fb
DC ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Input/Output Characteristic
G
DIFF
Gain V
IN
= ±100mV Differential
l
19.6 20 20.4 dB
∆G Gain Matching Channel-to-Channel
l
±0.1 ±0.25 dB
TC
GAIN
Gain Temperature Drift V
IN
= ±100mV Differential
l
0.0015 dB/°C
V
SWINGMIN
Output Swing Low (V
OCM
= 1.5V) Each Output, V
IN
= ±400mV Differential
l
0.2 0.35 V
V
SWINGMAX
Output Swing High (V
OCM
= 1.5V) Each Output, V
IN
= ±400mV Differential
l
2.65 2.8 V
V
OUTDIFFMAX
Maximum Differential Output Swing
l
4.6 5.2 V
P-P
I
OUT
Output Current Drive 2V
P-P, OUT
(Note 10)
l
20 mA
V
OS
Input Offset Voltage Differential
l
–2 ±0.4 2 mV
TCV
OS
Input Offset Voltage Drift Differential
l
1.2 µV/°C
I
VRMIN
Input Common Mode Voltage Range, MIN
l
1V
I
VRMAX
Input Common Mode Voltage Range, MAX
l
1.6 V
R
INDIFF
Input Resistance (+IN, –IN) Differential
l
170 200 230
∆R
IN
Input Impedance Matching Channel-to-Channel
l
±0.5 ±2.5 %
C
INDIFF
Input Capacitance (+IN, –IN) Differential, Includes Parasitic 1 pF
R
OUTDIFF
Output Resistance (+OUT, – OUT) Differential
l
20 25 36 Ω
CMRR Common Mode Rejection Ratio Input Common Mode Voltage 1V to 1.6V
l
45 68 dB
Output Common Mode Voltage Control
G
CM
Common Mode Gain V
OCM
= 1.1V to 1.6V 1 V/V
V
OCMMIN
Output Common Mode Range, MIN
l
1.1 V
V
OCMMAX
Output Common Mode Range, MAX
l
1.6 V
V
OSCM
Common Mode Offset Voltage V
OCM
= 1.25V to 1.5V
l
–10 ±2 10 mV
TCV
OSCM
Common Mode Offset Voltage Drift
l
16 µV/°C
IV
OCM
V
OCM
Input Current
l
–15 –3 0 µA
ENABLEx Pins (x = A, B)
V
IL
ENABLEx Input Low Voltage
l
0.8 V
V
IH
ENABLEx Input High Voltage
l
2.4 V
ENABLEx Input Current ENABLEx ≤ 0.8V
ENABLEx ≥ 2.4V
l
l
1.5
±0.5
4
µA
µA
Power Supply
V
S
Operating Supply Range
l
2.85 3 3.5 V
I
S
Supply Current ENABLEx ≤ 0.8V; per Amplifi er
l
80 95 mA
I
SHDN
Shutdown Supply Current ENABLEx ≥ 2.4V; per Amplifi er. Inputs Floating
l
13 mA
PSRR Power Supply Rejection Ratio (Differential
Outputs)
V
+
= 2.85V to 3.5V
l
55 86 dB
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
+
= 3V, V
–
= 0V, +IN = –IN = V
OCM
= 1.25V, ENABLE = 0V, No R
L
unless
otherwise noted.
P1-P3P4-P6P7-P9P10-P12P13-P14

LTC6420CUDC-20#TRPBF

Mfr. #:
Buy LTC6420CUDC-20#TRPBF
Manufacturer:
Analog Devices Inc.
Description:
High Speed Operational Amplifiers 2x Matched 1.8GHz Diff Amps/ADC Drvrs
Lifecycle:
New from this manufacturer.
Delivery:
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