LT6600CS8-5-PBF LINER [Linear Technology], LT6600CS8-5-PBF Datasheet

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LT6600CS8-5-PBF

Manufacturer Part Number
LT6600CS8-5-PBF
Description
Very Low Noise, Differential Amplifi er and 5MHz Lowpass Filter
Manufacturer
LINER [Linear Technology]
Datasheet
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APPLICATIONS
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L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
FEATURES
Programmable Differential Gain via Two External
Resistors
Adjustable Output Common Mode Voltage
Operates and Specifi ed with 3V, 5V, ±5V Supplies
0.5dB Ripple 4th Order Lowpass Filter with 5MHz
Cutoff
82dB S/N with 3V Supply and 2V
Low Distortion, 2V
Fully Differential Inputs and Outputs
Compatible with Popular Differential Amplifi er
Pinouts
Available in an SO-8 Package
High Speed ADC Antialiasing and DAC Smoothing in
Networking or Cellular Base Station Applications
High Speed Test and Measurement Equipment
Medical Imaging
Drop-in Replacement for Differential Amplifi ers
1MHz: 93dBc 2nd, 96dBc 3rd
(1V-1.5V)
Dual, Matched, 5MHz Lowpass Filter
V
OCM
Q
I
IN
IN
0.01μF
0.01μF
P-P
R
R
R
R
IN
IN
IN
IN
, 800Ω Load
1
7
2
8
1
7
2
8
+
+
LT6600-5
LT6600-5
3V
3V
3
6
3
6
+
+
0.1μF
0.1μF
4
5
4
5
P-P
GAIN =
Q
I
OUT
OUT
Output
806Ω
R
IN
Amplifi er and 5MHz Lowpass Filter
DESCRIPTION
The LT
4th order 5MHz lowpass fi lter approximating a Chebyshev
frequency response. Most differential amplifi ers require
many precision external components to tailor gain and
bandwidth. In contrast, with the LT6600-5, two external
resistors program differential gain, and the fi lter’s 5MHz
cutoff frequency and passband ripple are internally set.
The LT6600-5 also provides the necessary level shifting
to set its output common mode voltage to accommodate
the reference voltage requirements of A/Ds.
Using a proprietary internal architecture, the LT6600-5
integrates an antialiasing fi lter and a differential ampli-
fi er/driver without compromising distortion or low noise
performance. At unity gain the measured in band sig-
nal-to-noise ratio is an impressive 82dB. At higher gains
the input referred noise decreases so the part can process
smaller input differential signals without signifi cantly
degrading the output signal-to-noise ratio.
The LT6600-5 also features low voltage operation. The
differential design provides outstanding performance for
a 2V
3V supply.
For similar devices with other cutoff frequencies, refer to
the LT6600-20, LT6600-10 and LT6600-2.5.
P-P
®
30
25
20
15
10
Very Low Noise, Differential
5
0
6600-5 combines a fully differential amplifi er with a
–135
signal level while the part operates with a single
5MHz Phase Distribution
–134.5
–134
5MHz PHASE (DEG)
(50 Units)
–133.5
–133 –132.5
–132 –131.5
66005 TA01
LT6600-5
66005fa
1

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LT6600CS8-5-PBF Summary of contents

Page 1

FEATURES n Programmable Differential Gain via Two External Resistors n Adjustable Output Common Mode Voltage n Operates and Specifi ed with 3V, 5V, ±5V Supplies n 0.5dB Ripple 4th Order Lowpass Filter with 5MHz Cutoff n 82dB S/N with 3V ...

Page 2

... LT6600IS8-5#PBF LT6600IS8-5#TRPBF LEAD BASED FINISH TAPE AND REEL LT6600CS8-5 LT6600CS8-5#TR LT6600IS8-5 LT6600IS8-5#TR Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. For more information on lead free part marking, go to: For more information on tape and reel specifi cations, go to: ELECTRICAL CHARACTERISTICS range, otherwise specifi ...

Page 3

ELECTRICAL CHARACTERISTICS range, otherwise specifi cations are 25°C. Unless otherwise specifi PARAMETER Filter Gain 229Ω IN Filter Gain Temperature Coeffi cient (Note 2) f Noise Distortion (Note 4) Differential Output Swing Input ...

Page 4

LT6600-5 TYPICAL PERFORMANCE CHARACTERISTICS Amplitude Response GAIN = 25°C A –10 –20 –30 –40 –50 –60 –70 –80 0 FREQUENCY (MHz) 66005 G01 Output Impedance vs Frequency 100 V ...

Page 5

TYPICAL PERFORMANCE CHARACTERISTICS Distortion vs Signal Level –40 3RD HARMONIC –50 5MHz INPUT –60 2ND HARMONIC 5MHz INPUT –70 3RD HARMONIC –80 1MHz INPUT 2ND HARMONIC –90 1MHz INPUT –100 V = ± 800Ω 25°C ...

Page 6

LT6600-5 PIN FUNCTIONS – and IN (Pins 1, 8): Input Pins. Signals can be ap- plied to either or both input pins through identical external resistors The DC gain from differential inputs to the IN differential ...

Page 7

APPLICATIONS INFORMATION Interfacing to the LT6600-5 The LT6600-5 requires 2 equal external resistors, R set the differential gain to 806Ω/R + fi lter are the voltages V and external components, Figure 1. The difference between + – ...

Page 8

LT6600-5 APPLICATIONS INFORMATION the passband fl atness near 5MHz. The common mode output voltage is set to 2V. Use Figure 4 to determine the interface between the LT6600-5 and a current output DAC. The gain, or “tran- simpedance,” is defi ...

Page 9

APPLICATIONS INFORMATION 20 1dB PASSBAND GAIN 1MHz T COMPRESSION POINTS 0 1MHz T 3RD HARMONIC – 85°C A 3RD HARMONIC – 25°C A –60 –80 2ND HARMONIC T A –100 2ND HARMONIC T = 25°C A ...

Page 10

LT6600-5 APPLICATIONS INFORMATION 2.5V 0.1μ 25Ω – LT6600-5 2 25Ω – 0.1μ –2.5V Figure 7 Example: With the IC removed and the 25Ω resistors grounded, ...

Page 11

APPLICATIONS INFORMATION Junction temperature calculated from the ambient J temperature and power dissipation dissipation is the product of supply voltage, V supply current Therefore, the junction temperature S is given by: ...

Page 12

LT6600-5 TYPICAL APPLICATION Single-Ended Input ( 0.1μF 249Ω 249Ω 249Ω 0.1μF Amplitude Response 12 0 –12 –24 –36 –48 –60 –72 –84 –96 –108 100 1 FREQUENCY (Hz) RELATED PARTS PART NUMBER DESCRIPTION ® LTC 1565-31 ...

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