6600-10 combines a fully differential amplifier with a
4th order 10MHz lowpass filter approximating a Chebyshev
frequency response. Most differential amplifiers 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 accommodate
the reference voltage requirements of A/Ds.
Using a proprietary internal architecture, the LT6600-10
integrates an antialiasing filter and a differential ampli-
fier/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 significantly
degrading the output signal-to-noise ratio.
The LT6600-10 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.
For similar devices with other cutoff frequencies, refer to
the LT6600-20, LT6600-15, LT6600-5 and LT6600-2.5.
n
n
n
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
P-P
Output
Low Distortion, 2V
P-P
, 800Ω Load
1MHz: 88dBc 2nd, 97dBc 3rd
5MHz: 74dBc 2nd, 77dBc 3rd
Fully Differential Inputs and Outputs
Compatible with Popular Differential Amplifier Pinouts
SO-8 and DFN-12 Packages
APPLICATIONS
n
n
n
n
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
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
LT6600-10
5V
0.1μF
R
IN
402Ω 1
7
0.01μF
V
IN
R
IN
402Ω
2
8
3
(S8 pin numbers shown)
0
–10
–20
5V
FREQUENCY (dB)
V
+
LTC1748
V
CM
1μF
D
OUT
V
–
–30
–40
–50
–60
–70
–80
–90
–100
–110
6600 TA01a
An 8192 Point FFT Spectrum
INPUT IS A 4.7MHz SINEWAVE
2V
P-P
f
SAMPLE
= 66MHz
–
V
MID
V
OCM
+
–
4
49.9Ω
18pF
+
A
IN
49.9Ω
5
+
6
–
GAIN = 402Ω/R
IN
0
4
8
12 16 20 24
FREQUENCY (MHz)
28
32
6600 TA01b
66001fe
1
LT6600-10
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Total Supply Voltage .................................................11V
Input Current (Note 8)..........................................±10mA
Operating Temperature Range (Note 6).... –40°C to 85°C
Specified 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
PIN CONFIGURATION
TOP VIEW
IN
–
NC
V
OCM
V
+
NC
OUT
+
1
2
3
4
5
6
13
12 IN
+
11 NC
10 V
MID
9 V
–
8
V
–
7 OUT
–
IN
–
1
V
OCM
2
V
+
3
OUT
+
4
TOP VIEW
8
7
6
5
IN
+
V
MID
V
–
OUT
–
DF PACKAGE
12-LEAD (4mm 4mm) PLASTIC DFN
T
JMAX
= 150°C,
θ
JA
= 43°C/W,
θ
JC
= 4°C/W
EXPOSED PAD (PIN 13) IS V
–
, MUST BE SOLDERED TO PCB
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 150°C,
θ
JA
= 100°C/W
ORDER INFORMATION
LEAD FREE FINISH
LT6600CS8-10#PBF
LT6600IS8-10#PBF
LT6600CDF-10#PBF
LT6600IDF-10#PBF
LEAD BASED FINISH
LT6600CS8-10
LT6600IS8-10
TAPE AND REEL
LT6600CS8-10#TRPBF
LT6600IS8-10#TRPBF
LT6600CDF-10#TRPBF
LT6600IDF-10#TRPBF
TAPE AND REEL
LT6600CS8#TR
LT6600IS8-10#TR
PART MARKING
660010
600I10
60010
60010
PART MARKING
660010
600I10
PACKAGE DESCRIPTION
8-Lead Plastic SO
8-Lead Plastic SO
12-Lead (4mm
×
4mm) Plastic DFN
12-Lead (4mm
×
4mm) Plastic DFN
PACKAGE DESCRIPTION
8-Lead Plastic SO
8-Lead Plastic SO
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based finish parts.
The temperature grade is identified by a label on the shipping container for the DFN Package.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
66001fe
2
LT6600-10
ELECTRICAL CHARACTERISTICS
The
l
denotes the specifications which apply over the full operating temperature
+
–
range, otherwise specifications are at T
A
= 25°C. Unless otherwise specified V
S
= 5V (V = 5V, V = 0V), R
IN
= 402Ω, and R
LOAD
= 1k.
PARAMETER
Filter Gain, V
S
= 3V
CONDITIONS
V
IN
= 2V
P-P
, f
IN
= DC to 260kHz
V
IN
= 2V
P-P
, f
IN
= 1MHz (Gain Relative to 260kHz)
V
IN
= 2V
P-P
, f
IN
= 5MHz (Gain Relative to 260kHz)
V
IN
= 2V
P-P
, f
IN
= 8MHz (Gain Relative to 260kHz)
V
IN
= 2V
P-P
, f
IN
= 10MHz (Gain Relative to 260kHz)
V
IN
= 2V
P-P
, f
IN
= 30MHz (Gain Relative to 260kHz)
V
IN
= 2V
P-P
, f
IN
= 50MHz (Gain Relative to 260kHz)
Filter Gain, V
S
= 5V
V
IN
= 2V
P-P
, f
IN
= DC to 260kHz
V
IN
= 2V
P-P
, f
IN
= 1MHz (Gain Relative to 260kHz)
V
IN
= 2V
P-P
, f
IN
= 5MHz (Gain Relative to 260kHz)
V
IN
= 2V
P-P
, f
IN
= 8MHz (Gain Relative to 260kHz)
V
IN
= 2V
P-P
, f
IN
= 10MHz (Gain Relative to 260kHz)
V
IN
= 2V
P-P
, f
IN
= 30MHz (Gain Relative to 260kHz)
V
IN
= 2V
P-P
, f
IN
= 50MHz (Gain Relative to 260kHz)
Filter Gain, V
S
= ±5V
Filter Gain, R
IN
= 100Ω, V
S
= 3V, 5V, ±5V
Filter Gain Temperature Coefficient (Note 2)
Noise
Distortion (Note 4)
V
IN
= 2V
P-P
, f
IN
= DC to 260kHz
V
IN
= 0.5V
P-P
, f
IN
= DC to 260kHz
f
IN
= 260kHz, V
IN
= 2V
P-P
Noise BW = 10kHz to 10MHz, R
IN
= 402Ω
1MHz, 2V
P-P
, R
L
= 800Ω
5MHz, 2V
P-P
, R
L
= 800Ω
Differential Output Swing
Input Bias Current
Input Referred Differential Offset
Measured Between Pins 4 and 5
Pin 7 Shorted to Pin 2
Average of Pin 1 and Pin 8
R
IN
= 402Ω
V
S
= 3V
V
S
= 5V
V
S
= ±5V
V
S
= 3V
V
S
= 5V
V
S
= ±5V
2nd Harmonic
3rd Harmonic
2nd Harmonic
3rd Harmonic
V
S
= 5V
V
S
= 3V
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
MIN
–0.4
–0.1
–0.4
–0.3
–0.2
TYP
0
0
–0.1
0.1
0.3
–28
–44
MAX
0.5
0.1
0.3
1
1.7
–25
0.5
0.1
0.3
0.9
1.4
–25
0.4
12.6
UNITS
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
ppm/C
μV
RMS
dBc
dBc
dBc
dBc
V
P-P DIFF
V
P-P DIFF
μA
–0.5
–0.1
–0.4
–0.4
–0.3
0
0
–0.1
0.1
0.2
–28
–44
–0.6
11.4
–0.1
12
780
56
88
97
74
77
3.85
3.85
–85
5.0
4.9
–40
5
10
8
5
5
5
10
20
30
35
13
22
30
mV
mV
mV
mV
mV
mV
μV/°C
R
IN
= 100Ω
Differential Offset Drift
66001fe
3
LT6600-10
ELECTRICAL CHARACTERISTICS
The
l
denotes the specifications which apply over the full operating temperature
+
–
range, otherwise specifications are at T
A
= 25°C. Unless otherwise specified V
S
= 5V (V = 5V, V = 0V), R
IN
= 402Ω, and R
LOAD
= 1k.
CONDITIONS
Differential Input = 500mV
P-P
,
R
IN
= 100Ω
Differential Input = 2V
P-P
,
Pin 7 = OPEN
V
S
= 3V
V
S
= 5V
V
S
= ±5V
V
S
= 3V
V
S
= 5V
V
S
= ±5V
V
S
= 3V
V
S
= 5V
V
S
= ±5V
V
S
= 5V (S8)
V
S
= 5V (DFN)
V
S
= 3V
V
OCM
= V
MID
= V
S
/2
V
S
= 5V
V
S
= 3V
V
S
= 3V, V
S
= 5V
V
S
= 3V, V
S
= 3V
V
S
= ±5V
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
PARAMETER
Input Common Mode Voltage (Note 3)
MIN
0.0
0.0
–2.5
1.0
1.5
–1.0
–35
–40
–55
2.46
2.45
4.3
–15
–10
TYP
MAX
1.5
3.0
1.0
1.5
3.0
2.0
UNITS
V
V
V
V
V
V
mV
mV
mV
dB
V
V
V
kΩ
μA
μA
Output Common Mode Voltage (Note 5)
Output Common Mode Offset
(With Respect to Pin 2)
Common Mode Rejection Ratio
Voltage at V
MID
(Pin 7)
5
0
–5
61
2.51
2.51
1.5
5.5
–3
–3
35
36
40
40
35
2.55
2.56
7.7
V
MID
Input Resistance
V
OCM
Bias Current
Power Supply Current
39
43
46
mA
mA
mA
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 coefficient 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
). Specification guaranteed for
R
IN
≥ 100Ω.
Note 4:
Distortion is measured differentially using a differential stimulus,
The input common mode voltage, the voltage at V
OCM
, and the voltage at
V
MID
are equal to one half of the total power supply voltage.
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 V
OCM
.
Note 6:
The LT6600C is guaranteed functional over the operating
temperature range –40°C to 85°C.
Note 7:
The LT6600C is guaranteed to meet 0°C to 70°C 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 –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
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