LT6402 Linear Technology Corporation, LT6402 Datasheet

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LT6402

Manufacturer Part Number
LT6402
Description
300mhz Low Distortion, Low Noise Differential Ampli?er/ Adc Driver Av = 20db
Manufacturer
Linear Technology Corporation
Datasheet

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APPLICATIO S
FEATURES
All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
300 MHz –3dB Bandwidth
Fixed Gain of 20dB
Low Distortion:
Low Noise:
Differential Inputs and Outputs
Additional Filtered Outputs
Adjustable Output Common Mode Voltage
DC- or AC-Coupled Operation
Minimal Support Circuitry Required
Small 0.75mm Profi le 16-Lead 3mm × 3mm QFN
Package
Differential ADC Driver for:
Differential Driver/Receiver
Single Ended to Differential Conversion
Differential to Single Ended Conversion
Level Shifting
IF Sampling Receivers
SAW Filter Interfacing/Buffering
51dBm OIP3, –81dBc HD3 (20MHz, 2V
12.4dB NF, e
Imaging
Communications
IF IN
0.1µF
0.1µF
0.1µF
n
U
= 1.9nV/√Hz (20MHz)
–INB
–INA
+INB
+INA
LT6402-20
V
V
5V
CC
EE
V
OCM
+OUT
–OUT
U
0.1µF
10Ω
10Ω
P-P
AIN
AIN
)
+
LTC
V
®
CM
2249
6402 TA01a
300MHz Low Distortion, Low
Noise Differential Amplifi er/
DESCRIPTIO
The LT
amplifi er/ADC driver for use in applications from DC to
300MHz. The LT6402-20 has been designed for ease of
use, with minimal support circuitry required. Exceptionally
low input-referred noise and low distortion (with either
single-ended or differential inputs) make the LT6402-20
an excellent solution for driving high speed 12-bit and
14-bit ADCs. In addition to the normal unfi ltered outputs
(+OUT and –OUT), the LT6402-20 has a built-in 75MHz
differential low pass fi lter and an additional pair of fi ltered
outputs (+OUTFILTERED, –OUTFILTERED) to reduce
external fi ltering components when driving high speed
ADCs. The output common mode voltage is easily set via
the V
coupling capacitors in many applications.
The LT6402-20 is designed to meet the demanding require-
ments of communications transceiver applications. It can
be used as a differential ADC driver, a general-purpose
differential gain block, or in other applications requiring
differential drive. The LT6402-20 can be used in data
acquisition systems required to function at frequencies
down to DC.
The LT6402-20 operates on a 5V supply and consumes
30mA. It comes in a compact 16-lead 3mm × 3mm QFN pack-
age and operates over a –40°C to 85°C temperature range.
OCM
®
ADC Driver (A
6402-20 is a low distortion, low noise differential
pin, eliminating an output transformer or AC-
Distortion vs Frequency, Differential
–100
–40
–50
–60
–70
–80
–90
1
U
FILTERED OUTPUTS
V
OUT
= 2V
Input, No R
P-P
FREQUENCY (MHz)
10
HD3
HD2
LOAD
LT6402-20
V
= 20dB)
64022 G08
100
640220fa
1

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LT6402 Summary of contents

Page 1

... The LT6402-20 is designed to meet the demanding require- ments of communications transceiver applications. It can be used as a differential ADC driver, a general-purpose differential gain block other applications requiring differential drive. The LT6402-20 can be used in data acquisition systems required to function at frequencies down to DC. The LT6402-20 operates supply and consumes 30mA. It comes in a compact 16-lead 3mm × ...

Page 2

... JMAX JA JC EXPOSED PAD IS V (PIN 17) EE MUST BE SOLDERED TO THE PCB UD PART MARKING* LT6402CUD-20 LCBC LT6402IUD-20 LCBC http://www.linear.com/leadfree/ = 0V, ⎯ E ⎯ N ⎯ A ⎯ B ⎯ L ⎯ 0.8V, +INA = 5V EEA EEB EEC unless otherwise noted. LOAD MIN ...

Page 3

... Average of +OUT and –OUT OCM ⎯ E ⎯ N ⎯ A ⎯ B ⎯ L ⎯ 0.8V ⎯ E ⎯ N ⎯ A ⎯ B ⎯ L ⎯ ⎯ E ⎯ N ⎯ A ⎯ B ⎯ L ⎯ 0.8V ⎯ E ⎯ N ⎯ A ⎯ B ⎯ L ⎯ 5.5V LT6402-20 = 0V, ⎯ E ⎯ N ⎯ A ⎯ B ⎯ L ⎯ 0.8V, +INA = EEA EEB EEC unless otherwise noted ...

Page 4

... LT6402-20 AC ELECTRICAL CHARACTERISTICS ⎯ E ⎯ N ⎯ A ⎯ B ⎯ L ⎯ 0.8V, +INA shorted to +INB (+IN), –INA shorted to –INB (–IN), V unless otherwise noted. SYMBOL PARAMETER Input/Output Characteristics –3dBBW –3dB Bandwidth 0.1dBBW Bandwidth for 0.1dB Flatness 0.5dBBW Bandwidth for 0.5dB Flatness SR Slew Rate t 1% Settling s1% ...

Page 5

... The LT6402I is guaranteed to meet specifi ed performance from –40°C to 85°C. Note 5: Since the LT6402- feedback amplifi er with low output impedance, a resistive load is not required when driving an ADC. Therefore, typical output power is very small. In order to compare the ...

Page 6

... LT6402- TYPICAL PERFOR A CE CHARACTERISTICS Third Order Intermodulation Distortion vs Frequency Differential Input LOAD –60 2 TONES, 2V COMPOSITE P-P 1MHz TONE SPACING –65 –70 –75 UNFILTERED OUTPUTS –80 –85 –90 –95 FILTERED OUTPUTS –100 –105 –110 FREQUENCY (MHz) 64022 G04 ...

Page 7

... UNFILTERED OUTPUTS 110 100 PSRR CMRR 100 FREQUENCY (MHz) LT6402-20 Isolation vs Frequency –30 UNFILTERED OUTPUTS –40 –50 –60 –70 –80 –90 –100 –110 1000 1 10 100 FREQUENCY (MHz) 64022 G16 Input Refl ection Coeffi cient ...

Page 8

... FREQUENCY (MHz) Distortion vs Output Common Mode Voltage LT6402-20 Driving LTC2249 14-Bit ADC –80 FILTERED OUTPUTS LOAD V = 20MHz 2V OUT P-P –82 HD3 –84 –86 HD2 –88 –90 1 1.2 1.4 1.6 1.8 ...

Page 9

... E ⎯ N ⎯ A ⎯ B ⎯ L ⎯ E (Pin 11): This pin is a TTL logic input referenced to the V CC EEC typically 30mA of supply current. If high, the LT6402 is disabled and draws typically 250µA. +INA, +INB (Pins 15, 16): Positive Inputs. These pins are normally tied together. These inputs may be DC- or AC- coupled ...

Page 10

... AC-coupling capacitors. Input Impedance and Matching Networks Calculation of the input impedance of the LT6402-20 is not straightforward from examination of the block diagram because of the internal feedback network. In addition, the input impedance when driven differentially is different than when driven single-ended ...

Page 11

... Figure 3. Alternate Input Termination for Differential 50Ω Input Impedance W U and fi ltered outputs of the LT6402-20 can easily drive the high impedance inputs of these differential ADCs. If the fi ltered outputs are used, then cutoff frequency and the type of fi lter can be tailored for the specifi c application if needed ...

Page 12

... Pins) Filtering at the output of the LT6402-20 is often desired to provide either anti-aliasing or improved signal to noise ratio. To simplify this fi ltering, the LT6402-20 includes an additional pair of differential outputs (+OUTFILTERED and –OUTFILTERED) which incorporate an internal lowpass fi lter network with a –3dB bandwidth of 75MHz (Figure 5). ...

Page 13

... SNR 4dB Input Bias Voltage and Bias Current The input pins of the LT6402-20 are internally biased to the voltage applied to the V resistors are needed, even for AC-coupled operation. The input bias current is determined by the voltage difference between the input common mode voltage and the V pin (which sets the output common mode voltage) ...

Page 14

... LT6402-20 U TYPICAL APPLICATIO 14 Top Silkscreen 640220fa ...

Page 15

... Plastic QFN (3mm × 3mm) (Reference LTC DWG # 05-08-1691) 0.70 ±0.05 PACKAGE OUTLINE 0.25 ±0.05 0.50 BSC 0.75 ± 0.05 3.00 ± 0.10 (4 SIDES) 1.45 ± 0.10 (4-SIDES) 0.200 REF 0.00 – 0.05 LT6402-20 BOTTOM VIEW—EXPOSED PAD PIN 1 NOTCH R = 0.20 TYP R = 0.115 OR 0.25 × 45° CHAMFER TYP 15 16 0.40 ± 0. (UD16) QFN 0904 0.25 ± 0.05 0.50 BSC ...

Page 16

... R10 V ENABLE V V EEC CCB EEB 24.9Ω –INB –OUT R8 [ –INA –OUTFILTERED LT6402-20 [1] [ +INB +OUTFILTERED R9 24.9Ω +INA +OUT CCC OCM CCA EEA ...

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