LT6600-10 Linear Technology, LT6600-10 Datasheet

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LT6600-10

Manufacturer Part Number
LT6600-10
Description
Very Low Noise Differential Amplifier and 10MHz Lowpass Filter
Manufacturer
Linear Technology
Datasheet
FEATURES
TYPICAL APPLICATIO
V
APPLICATIO S
IN
, LTC and LT are registered trademarks of Linear Technology Corporation.
Programmable Differential Gain via Two External
Resistors
Adjustable Output Common Mode Voltage
Operates and Specified with 3V, 5V, 5V Supplies
0.5dB Ripple 4th Order Lowpass Filter with 10MHz
Cutoff
82dB S/N with 3V Supply and 2V
Low Distortion, 2V
Fully Differential Inputs and Outputs
SO-8 Package
Compatible with Popular Differential Amplifier
Pinouts
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 Amplifiers
0.01 F
402
1MHz: 88dBc 2nd, 97dBc 3rd
5MHz: 74dBc 2nd, 77dBc 3rd
R
IN
402
R
IN
GAIN = 402 /R
1
7
2
8
LT6600-10
V
V
+
MID
OCM
3
6
5V
+
0.1 F
U
4
5
IN
P-P
, 800 Load
49.9
49.9
U
18pF
P-P
Output
A
+
IN
V
CM
LTC1748
5V
1 F
V
D
+
V
Amplifier and 10MHz Lowpass Filter
OUT
6600 TA01a
DESCRIPTIO
The LT
with a 4th order 10MHz lowpass filter approximating a
Chebyshev frequency response. Most differential amplifi-
ers require many precision external components to tailor
gain and bandwidth. In contrast, with the LT6600-10, two
external resistors program differential gain, and the filter’s
10MHz cutoff frequency and passband ripple are internally
set. The LT6600-10 also provides the necessary level
shifting to set its output common mode voltage to accom-
modate the reference voltage requirements of A/Ds.
Using a proprietary internal architecture, the LT6600-10
integrates an antialiasing filter and a differential amplifier/
driver without compromising distortion or low noise
performance. At unity gain the measured in band
signal-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 LT6600-10 also features low voltage operation. The
differential design provides outstanding performance for
a 2V
supply.
For similar devices with other cutoff frequencies, refer to
the LT6600-20 and LT6600-2.5.
P-P
Very Low Noise, Differential
®
signal level while the part operates with a single 3V
6600-10 combines a fully differential amplifier
–100
–110
–20
–40
–50
–60
–80
–90
–10
–30
–70
0
0
U
An 8192 Point FFT Spectrum
4
8
FREQUENCY (MHz)
INPUT IS A 4.7MHz SINEWAVE
2V
f
SAMPLE
12
P-P
16
= 66MHz
www.DataSheet4U.com
20
LT6600-10
24
28
6600 TA01b
32
1
6600f

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LT6600-10 Summary of contents

Page 1

... Chebyshev frequency response. Most differential amplifi- ers require many precision external components to tailor gain and bandwidth. In contrast, with the LT6600-10, two external resistors program differential gain, and the filter’s Output 10MHz cutoff frequency and passband ripple are internally P-P set ...

Page 2

... LT6600- ABSOLUTE AXI U RATI GS (Note 1) Total Supply Voltage ................................................ 11V Operating Temperature Range (Note 6) ...– Specified Temperature Range (Note 7) ....– Junction Temperature ........................................... 150 C Storage Temperature Range ................. – 150 C Lead Temperature (Soldering, 10 sec).................. 300 C ELECTRICAL CHARACTERISTICS range, otherwise specifications are at T ...

Page 3

... Note 7: The LT6600C is guaranteed to meet specifications and is designed, characterized and expected to meet the extended temperature limits, but is not tested at –40 C and 85 C. The LT6600I is guaranteed to meet specified performance from – LT6600-10 www.DataSheet4U.com + – = 5V, V ...

Page 4

... LT6600- TYPICAL PERFOR A CE CHARACTERISTICS Amplitude Response 10 0 –10 –20 –30 –40 –50 –60 –70 –80 100k 1M FREQUENCY (Hz) Passband Gain and Group Delay GAIN = 0.5 5.3 10.1 14.9 FREQUENCY (MHz) 6600 G03 Power Supply Rejection Ratio ...

Page 5

... C P-P A –40 –50 –60 –70 –80 –90 –100 –1 0 0.5 1 1.5 2 –0.5 OUTPUT COMMON MODE VOLTAGE (V) 6600 G15 LT6600-10 www.DataSheet4U.com Distortion vs Input Common Mode Level 1MHz Input, 1x Gain, P 800 at Each Output –40 2ND HARMONIC 3RD HARMONIC, – ...

Page 6

... LT6600- CTIO S – and IN (Pins 1, 8): Input Pins. Signals can be applied to either or both input pins through identical external resistors The DC gain from differential inputs to the IN differential outputs is 402 / (Pin 2): Is the DC Common Mode Reference Voltage OCM for the 2nd Filter Stage. Its value programs the common mode voltage of the differential output of the filter ...

Page 7

... V and V is the common mode input voltage Similarly, the voltages V and V OUT 4 and 5 of the LT6600-10 are the filter outputs. The + difference between V and V OUT OUT output voltage. The average of V OUT common mode output voltage. Figure 1 illustrates the LT6600-10 operating with a single 3.3V supply and unity passband gain ...

Page 8

... Similarly, the output the LT6600-10 will have lower distortion with larger load resistance yet the analyzer input is typically 50 . The 4:1 turns (16:1 impedance) transformer and the two 402 resistors of Figure 5, present the output of the LT6600-10 with a 1600 differential load, or the equivalent of 800 + IN to ground at each output ...

Page 9

... Noise The noise performance of the LT6600-10 can be evaluated with the circuit of Figure 7. Given the low noise output of the LT6600-10 and the 6dB attenuation of the transformer coupling network, it will be necessary to measure the noise floor of the spectrum analyzer and subtract the instrument noise from the filter noise measurement ...

Page 10

... There is a need to ensure that the dies’s junction temperature does not exceed 150 C. The LT6600-10 package has Pin 6 fused to the lead frame to enhance thermal conduction when connecting to a ground plane or a large metal trace. Metal ...

Page 11

... TYP .016 – .050 .014 – .019 (0.406 – 1.270) (0.355 – 0.483) TYP INCHES (MILLIMETERS) LT6600-10 www.DataSheet4U.com . For example, using J 2 copper trace, the + (P • • 0.0489 • 100) = 109 .189 – .197 (4.801 – ...

Page 12

... GAIN = , MAXIMUM GAIN = WCDMA Transmit Filter (10MHz Lowpass Filter with a 28MHz Notch) 33pF 1 H 100 1 – 33pF R Q LT6600-10 301 2 27pF 1 H 100 GAIN = 12dB INDUCTORS ARE COILCRAFT 1008PS-102M RELATED PARTS PART NUMBER DESCRIPTION ® LTC ...

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