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LTC6421CUDC-20#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
LTC6421-20
1
642120fb
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
Dual Matched
1.3GHz Differential
Amplifi ers/ADC Drivers
The LTC
®
6421-20 is a dual high speed differential amplifi er
targeted at processing signals from DC to 140MHz. 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 LTC6421-20 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 LTC6421-20 saves space and power compared to
alternative solutions using IF gain blocks and transformers.
The LTC6421-20 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 ±0.2° at 100MHz
n
Channel Separation 80dB at 100MHz
n
1.3GHz –3dB Bandwidth; Fixed Gain of 10V/V (20dB)
n
IMD
3
= –76dBc at 100MHz, 2V
P-P
n
Equivalent OIP
3
= 42dBm 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
40mA Supply Current (120mW) per Amplifi er
n
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 ers with Output Common Mode Biasing
642120 TA01a
3V
V
+
A ENABLEA
LTC6421-20
Z
IN
= 200Ω
0.1μF
–INA
100Ω
1000Ω
1000Ω
+INA
V
–
V
–
+OUTA
V
OCMA
V
OCMA
±0.1dB GAIN MATCHING
±0.1° PHASE MATCHING
AT 100MHz
–OUTA
Z
IN
= 200Ω
V
OCMA
V
OCMA
V
+
B
3V
ENABLEBV
OCMB
V
OCMB
1000pF
0.1μF
V
INA
100Ω
12.5Ω
12.5Ω
0.1μF
+INB
100Ω
1000Ω
1000Ω
–INB
–OUTB
+OUTB
0.1μF
V
INB
100Ω
12.5Ω
12.5Ω
0.1μF
0.1μF
1000pF
V
OCMB
V
OCMB
CHANNEL-TO-CHANNEL GAIN MATCH (dB)
–0.25
PERCENTAGE OF UNITS
40
35
30
25
20
15
10
5
0
0.15
642120 TA01b
–0.15 –0.05 0.05 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.
LTC6421-20
2
642120fb
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
SELECTOR GUIDE
PART NUMBER
GAIN
(dB)
GAIN
(V/V)
Z
IN
(DIFFERENTIAL)
(Ω) COMMENTSINGLE DUAL
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
LTC6421CUDC-20#PBF LTC6421CUDC-20#TRPBF LDDN
20-Lead (3mm × 4mm) Plastic QFN
0°C to 70°C
LTC6421IUDC-20#PBF LTC6421IUDC-20#TRPBF LDDN
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/
LTC6421-20
3
642120fb
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
ΔG 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
0.1 0.25 V
V
SWINGMAX
Output Swing High (V
OCM
= 1.5V) Each Output, V
IN
= ±400mV Differential
l
2.75 2.9 V
V
OUTDIFFMAX
Maximum Differential Output Swing
l
5 5.6 V
P-P
I
OUT
Output Current Drive 2V
P-P, OUT
(Note 10)
l
10 mA
V
OS
Input Offset Voltage Differential
l
–2 ±0.4 2 mV
TCV
OS
Input Offset Voltage Drift Differential
l
1.4 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
Ω
ΔR
IN
Input Impedance Matching Channel-to-Channel
l
±1 ±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
= 1V to 1.6V 1 V/V
V
OCMMIN
Output Common Mode Range, MIN
l
1V
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
6 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
3
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
40 50 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-P15P16-P16

LTC6421CUDC-20#TRPBF

Mfr. #:
Buy LTC6421CUDC-20#TRPBF
Manufacturer:
Analog Devices Inc.
Description:
High Speed Operational Amplifiers 2x Matched 1.3GHz Diff Amps/ADC Drvrs
Lifecycle:
New from this manufacturer.
Delivery:
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