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LT6600IS8-2.5#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
LT6600-2.5
1
660025fe
TYPICAL APPLICATION
DESCRIPTION
Very Low Noise, Differential
Amplifi er and 2.5MHz Lowpass Filter
The LT
®
6600-2.5 combines a fully differential amplifi er
with a 4th order 2.5MHz lowpass fi lter approximating a
Chebyshev frequency response. Most differential ampli-
fi ers require many precision external components to tail
or gain and bandwidth. In contrast, with the LT6600-2.5,
two external resistors program differential gain, and the
fi lter’s 2.5MHz cutoff frequency and passband ripple are
internally set. The LT6600-2.5 also provides the necessary
level shifting to set its output common mode voltage to ac-
commodate the reference voltage requirements of A/Ds.
Using a proprietary internal architecture, the LT6600-2.5
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 signal-
to-noise ratio is an impressive 86dB. 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 LT6600-2.5 also features low voltage operation. The
differential design provides outstanding performance for a
4V
P-P
signal level while the part operates with a single 3V
supply. The LT6600-2.5 is available in SO-8 and DFN-12
packages.
For similar devices with higher cutoff frequency, refer
to the LT6600-5, LT6600-10, LT6600-15 and LT6600-20
data sheets.
DAC Output Filter
FEATURES
APPLICATIONS
n
±0.6dB (Max) Ripple 4th Order Lowpass Filter with
2.5MHz Cutoff
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
86dB S/N with 3V Supply and 1V
RMS
Output
n
Low Distortion, 1V
RMS
, 800 Load
1MHz: 95dBc 2nd, 88dBc 3rd
n
Fully Differential Inputs and Outputs
n
Compatible with Popular Differential Amplifi er
Pinouts
n
SO-8 and DFN-12 Packages
n
High Speed ADC Antialiasing and DAC Smoothing in
Networking or Cellular Basestation Applications
n
High Speed Test and Measurement Equipment
n
Medical Imaging
n
Drop-in Replacement for Differential Amplifi ers
DAC Output Spectrum LT6600-2.5 Output Spectrum
(S8 Pin Numbers Shown)
1580
1580
0.1µF
5V
5V
–5V
–5V
0.1µF
–
+
–
+
V
OUT
–
660025 TA01a
V
OUT
+
3
4
1
50MHz
7
2
8
5
6
52.3
52.3
LADCOM
I
OUT A
I
OUT B
CLK
LTC1668
16-BIT 4kHz to 2.5MHz
DISCRETE MULTI-TONE
SIGNAL AT 50MSPS
LT6600-2.5
FREQUENCY (MHz)
(dBm)
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
0 1201089684726048362412
660025 TA01b
DAC OUTPUT IMAGE
BASEBAND SIGNAL
FREQUENCY (MHz)
(dBm)
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
0 1201089684726048362412
660025 TA01c
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.
LT6600-2.5
2
660025fe
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
(Note 1)
TOP VIEW
DF PACKAGE
12-LEAD (4mm × 4mm) PLASTIC DFN
12
12
11
8
9
10
4
5
3
2
1
IN
+
NC
V
MID
V
–
V
–
OUT
–
IN
–
NC
V
OCM
V
+
NC
OUT
+
6
7
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
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
PIN CONFIGURATION
PARAMETER CONDITIONS MIN TYP MAX UNITS
Filter Gain, V
S
= 3V V
IN
= 2V
P-P
, f
IN
= DC to 260kHz –0.5 0.1 0.4 dB
R
IN
= 1580 V
IN
= 2V
P-P
, f
IN
= 700kHz (Gain Relative to 260kHz)
l
–0.15 0 0.1 dB
V
IN
= 2V
P-P
, f
IN
= 1.9MHz (Gain Relative to 260kHz)
l
–0.2 0.2 0.6 dB
V
IN
= 2V
P-P
, f
IN
= 2.2MHz (Gain Relative to 260kHz)
l
–0.6 0.1 0.5 dB
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE
LT6600CS8-2.5#PBF LT6600CS8-2.5#TRPBF 660025 8-Lead Plastic SO 0°C to 70°C
LT6600IS8-2.5#PBF LT6600IS8-2.5#TRPBF 600I25 8-Lead Plastic SO –40°C to 85°C
LT6600CDF-2.5#PBF LT6600CDF-2.5#TRPBF 60025
12-Lead (4mm × 4mm) Plastic DFN
0°C to 70°C
LT6600IDF-2.5#PBF LT6600IDF-2.5#TRPBF 60025
12-Lead (4mm × 4mm) Plastic DFN
–40°C to 85°C
LEAD BASED FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE
LT6600CS8-2.5 LT6600CS8-2.5#TR 660025 8-Lead Plastic SO 0°C to 70°C
LT6600IS8-2.5 LT6600IS8-2.5#TR 600I25 8-Lead Plastic SO –40°C to 85°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges.
*The temperature grade is identifi ed by a label on the shipping container for the DFN Package.
Consult LTC Marketing for information on nonstandard lead based fi nish parts.
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/
Junction Temperature ........................................... 150°C
Storage Temperature Range ................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
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
= 1580Ω, and R
LOAD
= 1k.
LT6600-2.5
3
660025fe
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
= 1580Ω, and R
LOAD
= 1k.
PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
= 2V
P-P
, f
IN
= 2.5MHz (Gain Relative to 260kHz)
l
–2.1 –0.9 0 dB
V
IN
= 2V
P-P
, f
IN
= 7.5MHz (Gain Relative to 260kHz)
l
–34 –31 dB
V
IN
= 2V
P-P
, f
IN
= 12.5MHz (Gain Relative to 260kHz)
l
–51 dB
Filter Gain, V
S
= 5V V
IN
= 2V
P-P
, f
IN
= DC to 260kHz –0.5 –0.1 0.4 dB
R
IN
= 1580 V
IN
= 2V
P-P
, f
IN
= 700kHz (Gain Relative to 260kHz)
l
–0.15 0 0.1 dB
V
IN
= 2V
P-P
, f
IN
= 2.2MHz (Gain Relative to 260kHz)
l
–0.2 0.2 0.6 dB
V
IN
= 2V
P-P
, f
IN
= 2.2MHz (Gain Relative to 260kHz)
l
–0.6 0.1 0.5 dB
V
IN
= 2V
P-P
, f
IN
= 2.5MHz (Gain Relative to 260kHz)
l
–2.1 –0.9 0 dB
V
IN
= 2V
P-P
, f
IN
= 7.5MHz (Gain Relative to 260kHz)
l
–34 –31 dB
V
IN
= 2V
P-P
, f
IN
= 12.5MHz (Gain Relative to 260kHz)
l
–51 dB
Filter Gain, V
S
= ±5V V
IN
= 2V
P-P
, f
IN
= DC to 260kHz –0.6 –0.1 0.4 dB
Filter Gain, R
IN
= 402 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
11.3
11.3
11.2
11.8
11.8
11.7
12.3
12.3
12.2
dB
dB
dB
Filter Gain Temperature Coeffi cient (Note 2) f
IN
= 260kHz, V
IN
= 2V
P-P
780 ppm/°C
Noise Noise BW = 10kHz to 2.5MHz 51 V
RMS
Distortion (Note 4) 1MHz, 1V
RMS
, R
L
= 800 2nd Harmonic
3rd Harmonic
95
88
dBc
dBc
Differential Output Swing Measured Between Pins 4 and 5 V
S
= 5V
V
S
= 3V
l
l
8.8
5.1
9.3
5.5
V
P-P DIFF
V
P-P DIFF
Input Bias Current Average of Pin 1 and Pin 8
l
–35 –15 A
Input Referred Differential Offset R
IN
= 1580, Differential Gain = 1V/V V
S
= 3V
V
S
= 5V
V
S
= ±5V
l
l
l
5
5
5
25
30
35
mV
mV
mV
R
IN
= 402, Differential Gain = 4V/V V
S
= 3V
V
S
= 5V
V
S
= ±5V
l
l
l
3
3
3
13
16
20
mV
mV
mV
Differential Offset Drift 10 V/°C
Input Common Mode Voltage (Note 3) Differential Input = 500mV
P-P
, V
S
= 3V
R
IN
≥ 402 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
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
–25
–30
–55
10
5
–10
45
45
35
mV
mV
mV
Common Mode Rejection Ratio 63 dB
Voltage at V
MID
(Pin 7) V
S
= 5V (S8)
V
S
= 5V (DFN)
V
S
= 3V
l
l
2.46
2.45
2.51
2.51
1.5
2.55
2.56
V
V
V
V
MID
Input Resistance
l
4.3 5.7 7.7 k
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
= 5V
V
S
= 3V, V
S
= 5V
V
S
= ±5V
l
l
26
28
30
33
36
mA
mA
mA
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LT6600IS8-2.5#PBF

Mfr. #:
Buy LT6600IS8-2.5#PBF
Manufacturer:
Analog Devices Inc.
Description:
Differential Amplifiers Very L N, Diff Amp & 2.5MHz Lpass Filt
Lifecycle:
New from this manufacturer.
Delivery:
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