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LT6600CS8-20#TRPBF

P1-P3P4-P6P7-P9P10-P12
LT6600-20
1
66002fb
TYPICAL APPLICATION
DESCRIPTION
Very Low Noise, Differential
Amplifi er and 20MHz Lowpass Filter
The LT
®
6600-20 combines a fully differential amplifi er with a
4th order 20MHz 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 LT6600-20, two external
resistors program differential gain, and the fi lter’s 20MHz
cutoff frequency and passband ripple are internally set.
The LT6600-20 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 LT6600-20
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 signal-
to-noise ratio is an impressive 76dB. 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 LT6600-20 also features low voltage operation. The
differential design provides outstanding performance for
a 2V
P-P
signal level while the part operates with a single
3V supply.
The LT6600-20 is packaged in an SO-8 and is pin compat-
ible with stand alone differential amplifi ers.
An 8192 Point FFT Spectrum
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
FEATURES
APPLICATIONS
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 20MHz
Cutoff
n
76dB S/N with 3V Supply and 2V
P-P
Output
n
Low Distortion, 2V
P-P
, 800Ω Load
2.5MHz: 83dBc 2nd, 88dBc 3rd
20MHz: 63dBc 2nd, 64dBc 3rd
n
Fully Differential Inputs and Outputs
n
SO-8 Package
n
Compatible with Popular Differential Amplifi er
Pinouts
n
High Speed ADC Antialiasing and DAC Smoothing in
Networking or Cellular Base Station Applications
n
High Speed Test and Measurement Equipment
n
Medical Imaging
n
Drop-in Replacement for Differential Amplifi ers
–
+
–
+
R
IN
402
R
IN
402
0.01µF
0.1µF
49.9
49.9
18pF
5V
5V
–
+
V
MID
V
OCM
V
IN
V
CM
A
IN
V
+
V
–
D
OUT
LT6600-20
A/D
LTC1748
3
4
1
7
2
8
5
6
66002 TA01a
GAIN = 402/R
IN
1µF
FREQUENCY (MHz)
0
AMPLITUDE (dB)
–60
–30
–20
40
66002 TA01b
–70
–80
–120
10
20
30
–100
0
–10
–40
–50
–90
–110
INPUT 5.9MHz
2V
P-P
f
SAMPLE
= 80MHz
LT6600-20
2
66002fb
PIN CONFIGURATION ABSOLUTE MAXIMUM RATINGS
Total Supply Voltage .................................................11V
Input Current (Note 8) ..........................................±10mA
Operating Temperature Range (Note 6).... –40°C to 85°C
Specifi ed Temperature Range (Note 7) .... –40°C to 85°C
Junction Temperature ........................................... 150°C
Storage Temperature Range ................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
(Note 1)
TOP VIEW
IN
+
V
MID
V
–
OUT
–
IN
–
V
OCM
V
+
OUT
+
S8 PACKAGE
8-LEAD PLASTIC SO
1
2
3
4
8
7
6
5
T
JMAX
= 150°C, θ
JA
= 100°C/W
PARAMETER CONDITIONS MIN TYP MAX UNITS
Filter Gain, V
S
= 3V V
IN
= 2V
P-P
, f
IN
= DC to 260kHz –0.4 0.1 0.5 dB
V
IN
= 2V
P-P
, f
IN
= 2MHz (Gain Relative to 260kHz)
l
–0.1 0 0.1 dB
V
IN
= 2V
P-P
, f
IN
= 10MHz (Gain Relative to 260kHz)
l
–0.2 0.1 0.5 dB
V
IN
= 2V
P-P
, f
IN
= 16MHz (Gain Relative to 260kHz)
l
–0.1 0.5 1.9 dB
V
IN
= 2V
P-P
, f
IN
= 20MHz (Gain Relative to 260kHz)
l
–0.8 0 1 dB
V
IN
= 2V
P-P
, f
IN
= 60MHz (Gain Relative to 260kHz)
l
–33 –28 dB
V
IN
= 2V
P-P
, f
IN
= 100MHz (Gain Relative to 260kHz)
l
–50 dB
Filter Gain, V
S
= 5V V
IN
= 2V
P-P
, f
IN
= DC to 260kHz –0.5 0 0.5 dB
V
IN
= 2V
P-P
, f
IN
= 2MHz (Gain Relative to 260kHz)
l
–0.1 0 0.1 dB
V
IN
= 2V
P-P
, f
IN
= 10MHz (Gain Relative to 260kHz)
l
–0.2 0.1 0.4 dB
V
IN
= 2V
P-P
, f
IN
= 16MHz (Gain Relative to 260kHz)
l
–0.3 0.4 1.6 dB
V
IN
= 2V
P-P
, f
IN
= 20MHz (Gain Relative to 260kHz)
l
–1.3 –0.4 0.6 dB
V
IN
= 2V
P-P
, f
IN
= 60MHz (Gain Relative to 260kHz)
l
–33 –28 dB
V
IN
= 2V
P-P
, f
IN
= 100MHz (Gain Relative to 260kHz)
l
–50 dB
Filter Gain, V
S
= ±5V V
IN
= 2V
P-P
, f
IN
= DC to 260kHz –0.6 –0.1 0.4 dB
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LT6600CS8-20#PBF LT6600CS8-20#TRPBF 660020 8-Lead Plastic SO –40°C to 85°C
LT6600IS8-20#PBF LT6600IS8-20#TRPBF 600I20 8-Lead Plastic SO –40°C to 85°C
LEAD BASED FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LT6600CS8-20 LT6600CS8-20#TR 660020 8-Lead Plastic SO –40°C to 85°C
LT6600IS8-20 LT6600IS8-20#TR 600I20 8-Lead Plastic SO –40°C to 85°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges.
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/
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating temperature
range, otherwise specifi cations are at T
A
= 25°C. Unless otherwise specifi ed V
S
= 5V (V
+
= 5V, V
–
= 0V), R
IN
= 402, and R
LOAD
= 1k.
LT6600-20
3
66002fb
ELECTRICAL CHARACTERISTICS
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: This is the temperature coeffi cient of the internal feedback
resistors assuming a temperature independent external resistor (R
IN
).
Note 3: The input common mode voltage is the average of the voltages
applied to the external resistors (R
IN
). Specifi cation guaranteed for R
IN
≥
100Ω.
Note 4: Distortion is measured differentially using a differential stimulus.
The input common mode voltage, the voltage at Pin 2, and the voltage at
Pin 7 are equal to one half of the total power supply voltage.
The l denotes the specifi cations which apply over the full operating temperature
range, otherwise specifi cations are at T
A
= 25°C. Unless otherwise specifi ed V
S
= 5V (V
+
= 5V, V
–
= 0V), R
IN
= 402, and R
LOAD
= 1k.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Filter Gain, R
IN
= 100 V
IN
= 0.5V
P-P
, f
IN
= DC to 260kHz, V
S
= 3V
V
IN
= 0.5V
P-P
, f
IN
= DC to 260kHz, V
S
= 5V
V
IN
= 0.5V
P-P
, f
IN
= DC to 260kHz, V
S
= 5V
11.6
11.5
11.4
12.1
12.0
11.9
12.6
12.5
12.4
dB
dB
dB
Filter Gain Temperature Coeffi cient (Note 2) f
IN
= 250kHz, V
IN
= 2V
P-P
780 ppm/C
Noise Noise BW = 10kHz to 20MHz 118 µV
RMS
Distortion (Note 4) 2.5MHz, 2V
P-P
, R
L
= 800Ω 2nd Harmonic
3rd Harmonic
83
88
dBc
dBc
20MHz, 2V
P-P
, R
L
= 800Ω 2nd Harmonic
3rd Harmonic
63
64
dBc
dBc
Differential Output Swing Measured Between Pins 4 and 5 V
S
= 5V
V
S
= 3V
l
l
3.80
3.75
4.75
4.50
V
P-P DIFF
V
P-P DIFF
Input Bias Current Average of Pin 1 and Pin 8
l
–95 –50 µA
Input Referred Differential Offset R
IN
= 402Ω V
S
= 3V
V
S
= 5V
V
S
= ±5V
l
l
l
5
10
10
25
30
35
mV
mV
mV
R
IN
= 100Ω V
S
= 3V
V
S
= 5V
V
S
= ±5V
l
l
l
5
5
5
15
17
20
mV
mV
mV
Differential Offset Drift 10 µV/°C
Input Common Mode Voltage (Note 3) Differential Input = 500mV
P-P
, V
S
= 3V
R
IN
= 100Ω V
S
= 5V
V
S
= ±5V
l
l
l
0.0
0.0
–2.5
1.5
3.0
1.0
V
V
V
Output Common Mode Voltage (Note 5) Differential Input = 2V
P-P
, V
S
= 3V
Pin 7 = OPEN V
S
= 5V
Common Mode Voltage at Pin 2 V
S
= ±5V
l
l
l
1.0
1.5
–1.0
1.5
3.0
2.0
V
V
V
Output Common Mode Offset
(with Respect to Pin 2)
V
S
= 3V
V
S
= 5V
V
S
= ±5V
l
l
l
–35
–40
–55
5
0
–5
40
40
35
mV
mV
mV
Common Mode Rejection Ratio 66 dB
Voltage at V
MID
(Pin 7) V
S
= 5
V
S
= 3
l
2.46 2.51
1.5
2.55 V
V
V
MID
Input Resistance
l
4.35 5.7 7.65 kΩ
V
OCM
Bias Current V
OCM
= V
MID
= V
S
/2 V
S
= 5V
V
S
= 3V
l
l
–15
–10
–3
–3
µA
µA
Power Supply Current V
S
= 3V, V
S
= 5
V
S
= 3V, V
S
= 5
V
S
= ±5V
l
l
42
46
46
53
56
mA
mA
mA
Note 5: Output common mode voltage is the average of the voltages at
Pins 4 and 5. The output common mode voltage is equal to the voltage
applied to Pin 2.
Note 6: The LT6600C-20 is guaranteed functional over the operating
temperature range –40°C to 85°C.
Note 7: The LT6600C-20 is guaranteed to meet 0°C to 70°C specifi cations
and is designed, characterized and expected to meet the extended
temperature limits, but is not tested at –40°C and 85°C. The LT6600I-20 is
guaranteed to meet specifi ed performance from –40°C to 85°C.
Note 8: The inputs are protected by back-to-back diodes. If the differential
input voltage exceeds 1.4V, the input current should be limited to less than
10mA.
P1-P3P4-P6P7-P9P10-P12

LT6600CS8-20#TRPBF

Mfr. #:
Buy LT6600CS8-20#TRPBF
Manufacturer:
Analog Devices Inc.
Description:
Differential Amplifiers Very L N, Diff Amp & 20MHz Lpass Filt
Lifecycle:
New from this manufacturer.
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