LTC6400-14 Linear Technology, LTC6400-14 Datasheet

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LTC6400-14

Manufacturer Part Number
LTC6400-14
Description
Low Distortion Differential ADC Driver
Manufacturer
Linear Technology
Datasheet
www.DataSheet4U.com
FEATURES
APPLICATIONS
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TYPICAL APPLICATION
2.4GHz –3dB Bandwidth
Fixed Gain of 5V/V (14dB)
–97dBc IMD3 at 70MHz (Equivalent OIP3 = 52.4dBm)
–66dBc IMD3 at 300MHz (Equivalent OIP3 = 36.9dBm)
1.1nV/√Hz Internal Op Amp Noise
2.5nV/√Hz Total Input Noise
7.5dB Noise Figure
Differential Inputs and Outputs
200Ω Input Impedance
2.85V to 3.5V Supply Voltage
85mA Supply Current (255mW)
1V to 1.6V Output Common Mode Voltage,
Adjustable
DC- or AC-Coupled Operation
Max Differential Output Swing 4.8V
Small 16-Lead 3mm × 3mm × 0.75mm QFN Package
Differential ADC Driver
Differential Driver/Receiver
Single Ended to Differential Conversion
IF Sampling Receivers
SAW Filter Interfacing
0.1μF
C2
V
IN
68.5Ω
R1
29Ω
1000pF
R2
C1
0.1μF
0.1μF
C3
C4
Single-Ended to Differential ADC Driver
3.3V
+IN
–IN
V
V –
+
LTC6400-14
V
OCM
+OUT
–OUT
1.25V
C5
0.1μF
COILCRAFT
0603CS
100Ω
15Ω
15Ω
R
R
P-P
R3
S1
S2
24nH
L1
C
33pF
C
33pF
C
33pF
F2
F1
F3
10Ω
10Ω
R
R
S3
S4
16-Bit ADC
130Msps
LTC2208
AIN
AIN
DESCRIPTION
The LTC
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 LTC6400-14 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 ca-
pacitors in many applications. The gain is internally fi xed
at 14dB (5V/V).
The LTC6400-14 saves space and power compared to
alternative solutions using IF gain blocks and transformers.
The LTC6400-14 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.
+
Distortion Differential ADC
LTC2208
3.3V
V
V
CM
DD
64014 TA01a
2.4GHz Low Noise, Low
®
6400-14 is a high-speed differential amplifi er
Driver for 300MHz IF
70
60
50
40
30
20
10
0
0
Equivalent Output IP3 vs
50
FREQUENCY (MHz)
100
Frequency
LTC6400-14
150
200
(NOTE 7)
250
640020 TA01b
300
640014fb
1

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LTC6400-14 Summary of contents

Page 1

... The gain is internally fi xed at 14dB (5V/V). The LTC6400-14 saves space and power compared to alternative solutions using IF gain blocks and transformers. The LTC6400-14 is packaged in a compact 16-lead 3mm × P-P 3mm QFN package and operates over the – 40°C to 85°C temperature range. ...

Page 2

... Consult LTC Marketing for information on non-standard lead based fi nish parts. For more information on lead free part marking, go to: For more information on tape and reel specifi cations, go to: LTC6400 AND LTC6401 SELECTOR GUIDE PART NUMBER LTC6400-8 LTC6400-14 LTC6400-20 LTC6400-26 LTC6401-8 LTC6401-14 LTC6401-20 LTC6401-26 In addition to the LTC6400 family of amplifi ...

Page 3

... Differential Differential Differential, Includes Parasitic Input Common Mode Voltage 1.1V~1. 1.6V OCM V = 1.1V to 1.5V OCM MIN MAX ENABLE = 0.8V ENABLE = 2.4V ENABLE = 0.8V ENABLE = 2.4V, Input and Output Floating + V = 2.85V to 3.5V LTC6400-14 = 1.25V, ENABLE = 0V unless OCM L MIN TYP MAX UNITS l 13.5 14 14.5 l –0.9 mdB/° 160 ...

Page 4

... LTC6400-14 www.DataSheet4U.com AC ELECTRICAL CHARACTERISTICS ENABLE = 0V unless otherwise noted. L SYMBOL PARAMETER –3dBBW –3dB Bandwidth 0.1dBBW Bandwidth for 0.1dB Flatness 0.5dBBW Bandwidth for 0.5dB Flatness 1/f 1/f Noise Corner SR Slew Rate t 1% Settling Time S1% t Overdrive Recovery Time OVDR t Turn-On Time ON t Turn-Off Time OFF – ...

Page 5

... L 2V Composite P-P, OUT L 2V Composite (Note 7) P-P, OUT 375Ω (Notes 375Ω (Note 5) L Includes Resistors (Short Inputs) LTC6400-14 + – 1.25V, OCM MIN TYP MAX UNITS –78/–74 dBc –81/–79 dBc –80 dBc – ...

Page 6

... Note 5: Input and output baluns used. See Test Circuit A. Note 6: Measured using Test Circuit B. Note 7: Since the LTC6400- 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 LTC6400-14 with amplifi ...

Page 7

... 87.5Ω PER OUTPUT TEST CIRCUIT B 0 1.15 1000 TIME (ns) LTC6400-14 S21 Phase and Group Delay vs Frequency 0 TEST CIRCUIT B –50 –100 –150 PHASE GROUP DELAY –200 3000 0 200 400 600 FREQUENCY (MHz) 640014 G02 PSRR and CMRR vs Frequency 100 80 80 ...

Page 8

... LTC6400-14 www.DataSheet4U.com TYPICAL PERFORMANCE CHARACTERISTICS Overdrive Recovery Response 87.5Ω PER OUTPUT L TEST CIRCUIT + –IN 0 –1 +OUT –2 –3 –OUT –4 – TIME (ns) 640014 G10 Third Order Intermodulation Distortion vs Frequency – 200Ω –50 – ...

Page 9

... FREQUENCY (MHz) 640014 G16 +OUT –OUT ENABLE –0 TIME (ns) 640014 G19 LTC6400-14 IMD3 vs V and V ICM – 200Ω SWEEP V –88 INPUT AC-COUPLED –91 –94 – COMPOSITE at 100MHz OUT P-P DIFFERENTIAL INPUT NO R – ...

Page 10

... LTC6400-14 www.DataSheet4U.com PIN FUNCTIONS + V (Pins 1, 3, 10): Positive Power Supply (Normally tied 3.3V). All three pins must be tied to the same voltage. Bypass each pin with 1000pF and 0.1μF capacitors as close to the pins as possible. V (Pin 2): This pin sets the output common mode OCM voltage. A 0.1μ ...

Page 11

... Moreover, they of- fer single-ended 50Ω matching in wideband applications and no external resistor is needed. The LTC6400-14 is very fl exible in terms of I/O coupling. It can be AC- or DC-coupled at the inputs, the outputs or both. Due to the internal connection between input and output, users are advised to keep input common mode voltage between 1V and 1 ...

Page 12

... The output common mode voltage is capable of tracking V 1.6V. The bandwidth Figure 5. LTC6400-14 Internal Filter Topology Modifi ed for Low Filter Bandwidth (Three External Capacitors) 13 +IN LTC6400-14 12.5Ω 1 +OUT 8 14 +IN 50Ω ...

Page 13

... LTC2208 V pin at 1.25V. Alternatively, a single- CM ended input signal can be converted to a differential signal via a balun and fed to the input of the LTC6400-14. Figure 8 summarizes the IMD3 of the whole system in Figure 7. Note that Figure 7 shows a direct connection to the LTC2208, but in many applications an anti-alias fi ...

Page 14

... V CC ENABLE 1 3 DIS JP1 R16 0Ω – V – + ENABLE V 13 +IN +OUT C2 R4 0.1μF 14 (2) C21 +IN +OUTF 0.1μF R24 SL1 LTC6400-14 (1) (2) 15 –IN –OUTF R3 C1 (2) 0.1μF 16 –IN –OUT V – OCM C10 0.1μF 1000pF R19 1.5k ...

Page 15

... ALL DIMENSIONS ARE IN MILLIMETERS 4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE 5. EXPOSED PAD SHALL BE SOLDER PLATED 6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE TOP AND BOTTOM OF PACKAGE LTC6400-14 V – 9 +OUT 37.4Ω PORT 3 8 (50Ω ...

Page 16

... LTC6400-14 www.DataSheet4U.com RELATED PARTS PART NUMBER DESCRIPTION High-Speed Differential Amplifi ers/Differential Op Amps LT ® 1993-2 800MHz Differential Amplifi er/ADC Driver LT1993-4 900MHz Differential Amplifi er/ADC Driver LT1993-10 700MHz Differential Amplifi er/ADC Driver LT1994 Low Noise, Low Distortion Differential Op Amp LT5514 Ultralow Distortion IF Amplifi ...

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