LT6600CS8-2.5-TR [Linear]
Very Low Noise, Differential Amplifi er and 2.5MHz Lowpass Filter; 非常低噪声,差分功率放大器呃至2.5MHz低通滤波器型号: | LT6600CS8-2.5-TR |
厂家: | Linear |
描述: | Very Low Noise, Differential Amplifi er and 2.5MHz Lowpass Filter |
文件: | 总16页 (文件大小:194K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
LT6600-2.5
Very Low Noise, Differential
Amplifier and 2.5MHz Lowpass Filter
FEATURES
DESCRIPTION
The LT®6600-2.5 combines a fully differential amplifier
with a 4th order 2.5MHz lowpass filter approximating a
Chebyshev frequency response. Most differential ampli-
fiers 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
filter’s 2.5MHz cutoff frequency and passband ripple are
internallyset. TheLT6600-2.5alsoprovidesthenecessary
levelshiftingtosetitsoutputcommonmodevoltagetoac-
commodate the reference voltage requirements of A/Ds.
n
0.6dB ꢀMaxꢁ ꢂipple 4th Order Lowpass Filter with
2.5MHz Cutoff
n
Programmable Differential Gain via Two External
ꢂesistors
Adjustable Output Common Mode Voltage
Operates and Specified with 3V, 5V, 5V Supplies
86dB S/N with 3V Supply and 1V
Low Distortion, 1V
n
n
n
n
Output
ꢂMS
, 800Ω Load
ꢂMS
1MHz: 95dBc 2nd, 88dBc 3rd
Fully Differential Inputs and Outputs
Compatible with Popular Differential Amplifier
Pinouts
SO-8 and DFN-12 Packages
n
n
Using a proprietary internal architecture, the LT6600-2.5
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 86dB. 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.
n
APPLICATIONS
n
High Speed ADC Antialiasing and DAC Smoothing in
Networking or Cellular Base Station Applications
n
High Speed Test and Measurement Equipment
The LT6600-2.5 also features low voltage operation. The
differentialdesignprovidesoutstandingperformancefora
n
Medical Imaging
n
Drop-in ꢂeplacement for Differential Amplifiers
4V signal level while the part operates with a single 3V
P-P
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
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.
(S8 Pin Numbers Shown)
TYPICAL APPLICATION
DAC Output Filter
DAC Output Spectrum
LT6600-2.5 Output Spectrum
0
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
5V
0.1μF
–10
–20
–30
–40
–50
–60
–70
–80
–90
5V
BASEBAND SIGNAL
52.3Ω
52.3Ω
1580Ω
1580Ω
3
1
LADCOM
–
4
+
–
V
I
OUT
7
2
+
OUT A
16 BIT 4kHz to 2.5MHz
DISCꢂETE MULTI-TONE
SIGNAL AT 50MSPS
LT6600-2.5
LTC1668
I
V
DAC OUTPUT IMAGE
–
6
OUT B
CLK
8
OUT
5
+
0.1μF
–5V 50MHz
–5V
660025 TA01a
0
12 24 36 48 60 72 84 96 108 120
0
12 24 36 48 60 72 84 96 108 120
FꢂEQUENCY ꢀMHzꢁ
FREQUENCY (MHz)
660025 TA01b
660025 TA01c
660025fb
1
LT6600-2.5
(Note 1)
ABSOLUTE MAXIMUM RATINGS
Total Supply Voltage ...................................................1V
Specified Temperature ꢂange ꢀNote 7ꢁ .... –40°C to 85°C
Junction Temperature ........................................... 150°C
Storage Temperature ꢂange................... –65°C to 150°C
Lead Temperature ꢀSoldering, 10 secꢁ .................. 300°C
Input Voltage ꢀNote 8ꢁ............................................... V
S
Input Current ꢀNote 8ꢁ.......................................... 10mA
Operating Temperature ꢂange ꢀNote 6ꢁ.... –40°C to 85°C
PIN CONFIGURATION
TOP VIEW
TOP VIEW
+
–
1
2
3
4
5
6
12 IN
11 NC
IN
–
+
IN
1
2
3
4
8
7
6
5
IN
NC
V
V
V
V
10
9
MID
–
OCM
V
V
V
OCM
MID
–
12
+
V
+
V
–
8
NC
+
+
–
OUT
OUT
–
7
OUT
OUT
S8 PACKAGE
8-LEAD PLASTIC SO
= 150°C, θ = 100°C/W
DF PACKAGE
12-LEAD ꢀ4mm × 4mmꢁ PLASTIC DFN
T
JMAX
JA
T
= 150°C, θ = 43°C/W, θ = 4°C/W
JA JC
EXPOSED PAD ꢀPIN 13ꢁ IS V–, MUST BE SOLDEꢂED TO PCB
JMAX
ORDER INFORMATION
LEAD FREE FINISH
LT6600CS8-2.5#PBF
LT6600IS8-2.5#PBF
LT6600CDF-2.5#PBF
LT6600IDF-2.5#PBF
LEAD BASED FINISH
LT6600CS8-2.5
TAPE AND REEL
PART MARKING
660025
PACKAGE DESCRIPTION
8-Lead Plastic SO
TEMPERATURE RANGE
0°C to 70°C
LT6600CS8-2.5#TꢂPBF
LT6600IS8-2.5#TꢂPBF
LT6600CDF-2.5#TꢂPBF
LT6600IDF-2.5#TꢂPBF
TAPE AND REEL
6600I25
8-Lead Plastic SO
–40°C to 85°C
0°C to 70°C
60025
12-Lead ꢀ4mm × 4mmꢁ Plastic DFN
12-Lead ꢀ4mm × 4mmꢁ Plastic DFN
PACKAGE DESCRIPTION
8-Lead Plastic SO
60025
–40°C to 85°C
TEMPERATURE RANGE
0°C to 70°C
PART MARKING
660025
LT6600CS8-2.5#Tꢂ
LT6600IS8-2.5#Tꢂ
LT6600IS8-2.5
600I25
8-Lead Plastic SO
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on nonstandard lead based finish parts.
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/
The l denotes the specifications which apply over the full operating temperature
ELECTRICAL CHARACTERISTICS
range, otherwise specifications are at TA = 25°C. Unless otherwise specified VS = 5V (V+ = 5V, V– = 0V), RIN = 1580Ω, and RLOAD = 1k.
PARAMETER
Filter Gain, V = 3V
CONDITIONS
MIN
–0.5
–0.15
–0.2
–0.6
–2.1
TYP
0.1
0
MAX
0.4
0.1
0.6
0.5
0
UNITS
dB
V
IN
V
IN
V
IN
V
IN
V
IN
= 2V , f = DC to 260kHz
P-P IN
S
l
l
l
l
ꢂ
= 1580Ω
= 2V , f = 700kHz ꢀGain ꢂelative to 260kHzꢁ
dB
IN
P-P IN
= 2V , f = 1.9MHz ꢀGain ꢂelative to 260kHzꢁ
0.2
0.1
–0.9
dB
P-P IN
= 2V , f = 2.2MHz ꢀGain ꢂelative to 260kHzꢁ
dB
P-P IN
= 2V , f = 2.5MHz ꢀGain ꢂelative to 260kHzꢁ
dB
P-P IN
660025fb
2
LT6600-2.5
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at TA = 25°C. Unless otherwise specified VS = 5V (V+ = 5V, V– = 0V), RIN = 1580Ω, and RLOAD = 1k.
PARAMETER
CONDITIONS
MIN
TYP
–34
–51
–0.1
0
MAX
UNITS
dB
l
l
V
IN
V
IN
V
IN
V
IN
V
IN
V
IN
V
IN
V
IN
V
IN
V
IN
= 2V , f = 7.5MHz ꢀGain ꢂelative to 260kHzꢁ
–31
P-P IN
= 2V , f = 12.5MHz ꢀGain ꢂelative to 260kHzꢁ
dB
P-P IN
Filter Gain, V = 5V
= 2V , f = DC to 260kHz
–0.5
–0.15
–0.2
–0.6
–2.1
0.4
0.1
0.6
0.5
0
dB
S
P-P IN
l
l
l
l
l
l
ꢂ
IN
= 1580Ω
= 2V , f = 700kHz ꢀGain ꢂelative to 260kHzꢁ
dB
P-P IN
= 2V , f = 2.2MHz ꢀGain ꢂelative to 260kHzꢁ
0.2
dB
P-P IN
= 2V , f = 2.2MHz ꢀGain ꢂelative to 260kHzꢁ
0.1
dB
P-P IN
= 2V , f = 2.5MHz ꢀGain ꢂelative to 260kHzꢁ
–0.9
–34
–51
–0.1
dB
P-P IN
= 2V , f = 7.5MHz ꢀGain ꢂelative to 260kHzꢁ
–31
dB
P-P IN
= 2V , f = 12.5MHz ꢀGain ꢂelative to 260kHzꢁ
dB
P-P IN
Filter Gain, V = 5V
= 2V , f = DC to 260kHz
–0.6
0.4
dB
S
P-P IN
Filter Gain, ꢂ = 402Ω
V
V
V
= 2V , f = DC to 260kHz, V = 3V
11.3
11.3
11.2
11.8
11.8
11.7
12.3
12.3
12.2
dB
dB
dB
IN
IN
IN
IN
P-P IN
S
= 2V , f = DC to 260kHz, V = 5V
P-P IN
S
= 2V , f = DC to 260kHz, V = 5V
P-P IN
S
Filter Gain Temperature Coefficient ꢀNote 2ꢁ
f
= 260kHz, V = 2V
P-P
780
51
ppm/C
IN
IN
Noise
Noise BW = 10kHz to 2.5MHz
1MHz, 1V , ꢂ = 800Ω
ꢃV
ꢂMS
Distortion ꢀNote 4ꢁ
2nd Harmonic
3rd Harmonic
95
88
dBc
dBc
ꢂMS
L
l
l
Differential Output Swing
Measured Between Pins 4 and 5
Average of Pin 1 and Pin 8
V = 5V
S
8.8
5.1
9.3
5.5
V
V
S
P-P DIFF
P-P DIFF
V = 3V
l
Input Bias Current
–35
–15
ꢃA
l
l
l
Input ꢂeferred Differential Offset
ꢂ
IN
= 1580Ω, Differential Gain = 1V/V
V = 3V
5
5
5
25
30
35
mV
mV
mV
S
V = 5V
S
V = 5V
S
l
l
l
ꢂ
= 402Ω, Differential Gain = 4V/V
V = 3V
3
3
3
13
16
20
mV
mV
mV
IN
S
V = 5V
S
V = 5V
S
Differential Offset Drift
10
ꢃV/°C
l
l
l
Input Common Mode Voltage ꢀNote 3ꢁ
Differential Input = 500mV
IN
,
V = 3V
0.0
0.0
–2.5
1.5
3.0
1.0
V
V
V
P-P
S
ꢂ
≥ 402Ω
V = 5V
S
V = 5V
S
l
l
l
Output Common Mode Voltage ꢀNote 5ꢁ
Differential Input = 2V
Pin 7 at Mid-Supply
,
V = 3V
1.0
1.5
–1.0
1.5
3.0
2.0
V
V
V
P-P
S
V = 5V
S
V = 5V
S
l
l
l
Output Common Mode Offset
ꢀwith ꢂespect to Pin 2ꢁ
V = 3V
–25
–30
–55
10
5
–10
45
45
35
mV
mV
mV
S
V = 5V
S
V = 5V
S
Common Mode ꢂejection ꢂatio
63
dB
l
l
Voltage at V
ꢀPin 7ꢁ
V = 5V ꢀS8ꢁ
2.46
2.45
2.51
2.51
1.5
2.55
2.56
V
V
V
MID
S
V = 5V ꢀDFNꢁ
S
V = 3V
S
l
V
V
Input ꢂesistance
Bias Current
4.3
5.7
7.7
kΩ
MID
l
l
V
OCM
= V
= V /2
V = 5V
S
–15
–10
–3
–3
μA
μA
OCM
MID
S
S
V = 3V
Power Supply Current
V = 3V, V = 5V
26
30
33
36
mA
mA
mA
S
S
l
l
V = 3V, V = 5V
S
S
V = 5V
28
S
660025fb
3
LT6600-2.5
ELECTRICAL CHARACTERISTICS
Note 1: Stresses beyond those listed under Absolute Maximum ꢂatings
may cause permanent damage to the device. Exposure to any Absolute
Maximum ꢂating condition for extended periods may affect device
reliability and lifetime.
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-2.5 is guaranteed functional over the operating
temperature range of –40°C to 85°C.
Note 2: This is the temperature coefficient of the internal feedback
resistors assuming a temperature independent external resistor ꢀꢂ ꢁ.
Note 3: The input common mode voltage is the average of the voltages
IN
Note 7: The LT6600C-2.5 is guaranteed to meet specified performance
from 0°C to 70°C and is designed, characterized and expected to meet
specified performance from –40°C and 85°C, but is not tested or QA
sampled at these temperatures. The LT6600I-2.5 is guaranteed to meet
specified performance from –40°C to 85°C.
applied to the external resistors ꢀꢂ ꢁ. Specification guaranteed for ꢂ
IN
IN
≥ 402Ω. For 5V supplies, the minimum input common mode voltage is
guaranteed by design to reach –5V.
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.
Note 4: Distortion is measured differentially using a single-ended stimulus.
The input common mode voltage, the voltage at V , and the voltage at
OCM
V
are equal to one half of the total power supply voltage.
MID
TYPICAL PERFORMANCE CHARACTERISTICS
Amplitude Response
Passband Gain and Group Delay
Passband Gain and Group Delay
12
0
12
11
10
9
320
300
280
260
240
220
200
180
160
140
120
1
0
320
300
280
260
240
220
200
180
160
140
120
V
=
IN
2.5V
S
ꢂ
= 1580ꢄ
GAIN = 1
–1
–2
–3
–4
–5
–6
–7
–8
–9
–12
–24
–36
–48
–60
–72
–84
–96
8
7
6
5
V
= 5V
IN
V
= 5V
IN
S
S
4
ꢂ
= 402ꢄ
ꢂ
= 1580ꢄ
GAIN = 4
GAIN = 1
3
T
= 25°C
T
= 25°C
A
A
2
100k
1M
10M
50M
0.5 0.75 1.0 1.25
2.0 2.25 2.5 2.75
3.0
1.5 1.75
0.5 0.75 1.0 1.25 1.5 1.75 2.0 2.25 2.5 2.75 3.0
FꢂEQUENCY ꢀHzꢁ
FꢂEQUENCY ꢀMHzꢁ
FꢂEQUENCY ꢀMHzꢁ
660025 G01
660025 G03
660025 G02
Output Impedance
vs Frequency (OUT+ or OUT–)
CMRR
PSRR
100
10
1
90
80
70
60
50
40
30
20
10
0
110
100
90
+
V
TO
DIFFEꢂENTIAL OUT
= 3V
V
V
= 1V
= 5V
IN
IN
S
P-P
V
ꢂ
= 1580ꢄ
S
GAIN = 1
80
70
60
50
0.1
40
1k
10k
100k
1M
10M
100M
100k
1M
10M
100M
1k
10k
100k
1M
10M
100M
FꢂEQUENCY ꢀHzꢁ
FꢂEQUENCY ꢀHzꢁ
FꢂEQUENCY ꢀHzꢁ
660025 G04
660025 G06
660025 G05
660025fb
4
LT6600-2.5
TYPICAL PERFORMANCE CHARACTERISTICS
Distortion vs Frequency
Distortion vs Frequency
–60
–70
–60
–70
DIFFEꢂENTIAL INPUT,
2ND HAꢂMONIC
DIFFEꢂENTIAL INPUT,
3ꢂD HAꢂMONIC
SINGLE-ENDED INPUT,
2ND HAꢂMONIC
SINGLE-ENDED INPUT,
3ꢂD HAꢂMONIC
DIFFEꢂENTIAL INPUT,
2ND HAꢂMONIC
DIFFEꢂENTIAL INPUT,
3ꢂD HAꢂMONIC
SINGLE-ENDED INPUT,
2ND HAꢂMONIC
SINGLE-ENDED INPUT,
3ꢂD HAꢂMONIC
–80
–80
–90
–90
V
= 2V
P-P
V
V
= 2V
= 3V
IN
S
L
IN
S
L
P-P
–100
–110
–100
–110
V
= 5V
= 800ꢄ AT
ꢂ
ꢂ
= 800ꢄ AT
EACH OUTPUT
EACH OUTPUT
0.1
1
10
0.1
1
10
FꢂEQUENCY ꢀMHzꢁ
FꢂEQUENCY ꢀMHzꢁ
660025 G08
660025 G07
Distortion vs Frequency
Distortion vs Signal Level
–40
–50
–60
–70
DIFFEꢂENTIAL INPUT,
2ND HAꢂMONIC
DIFFEꢂENTIAL INPUT,
3ꢂD HAꢂMONIC
SINGLE-ENDED INPUT,
2ND HAꢂMONIC
SINGLE-ENDED INPUT,
3ꢂD HAꢂMONIC
2ND HAꢂMONIC,
DIFFEꢂENTIAL INPUT
3ꢂD HAꢂMONIC,
DIFFEꢂENTIAL INPUT
2ND HAꢂMONIC,
SINGLE-ENDED INPUT
3ꢂD HAꢂMONIC,
SINGLE-ENDED INPUT
–60
–80
–70
–80
–90
–90
V
V
= 2V
V
= 3V
IN
S
P-P
S
–100
–110
=
5V
F = 1MHz
= 800ꢄ AT
–100
–110
ꢂ
= 800ꢄ AT
ꢂ
L
L
EACH OUTPUT
EACH OUTPUT
0
1
2
3
4
5
6
0.1
1
10
FꢂEQUENCY ꢀMHzꢁ
INPUT LEVEL ꢀV
ꢁ
P-P
660025 G10
660025 G09
Distortion vs Signal Level
Distortion vs Signal Level
–40
–50
–40
–50
2ND HAꢂMONIC,
DIFFEꢂENTIAL INPUT
3ꢂD HAꢂMONIC,
DIFFEꢂENTIAL INPUT
2ND HAꢂMONIC,
SINGLE-ENDED INPUT
3ꢂD HAꢂMONIC,
SINGLE-ENDED INPUT
2ND HAꢂMONIC,
DIFFEꢂENTIAL INPUT
3ꢂD HAꢂMONIC,
DIFFEꢂENTIAL INPUT
2ND HAꢂMONIC,
SINGLE-ENDED INPUT
3ꢂD HAꢂMONIC,
SINGLE-ENDED INPUT
–60
–60
–70
–70
–80
–80
–90
–90
V
=
5V
F = 1MHz
= 800ꢄ AT
V
= 5V
S
S
F = 1MHz
= 800ꢄ AT
–100
–110
–100
–110
ꢂ
ꢂ
L
L
EACH OUTPUT
EACH OUTPUT
0
1
2
3
4
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9
INPUT LEVEL ꢀV
ꢁ
P-P
INPUT LEVEL ꢀV
ꢁ
P-P
660025 G12
660025 G11
660025fb
5
LT6600-2.5
TYPICAL PERFORMANCE CHARACTERISTICS
Distortion
vs Input Common Mode Level
Distortion
vs Input Common Mode Level
–40
–50
–40
–50
2V 1MHz INPUT
2ND HAꢂMONIC,
= 3V
2ND HAꢂMONIC,
P-P
ꢂ
= 1580ꢄ
V
S
V
= 3V
IN
S
GAIN = 1
3ꢂD HAꢂMONIC,
= 3V
3ꢂD HAꢂMONIC,
= 3V
V
V
S
S
2ND HAꢂMONIC,
= 5V
–60
2ND HAꢂMONIC,
= 5V
–60
V
V
S
S
3ꢂD HAꢂMONIC,
= 5V
3ꢂD HAꢂMONIC,
= 5V
–70
–70
V
V
S
S
–80
–80
–90
–90
–100
–100
–110
2V 1MHz INPUT, ꢂ = 402ꢄ, GAIN = 4
P-P
IN
–110
–3
–2
–1
0
1
2
3
–3
–2
–1
0
1
2
3
INPUT COMMON MODE VOLTAGE ꢂELATIVE TO V
ꢀVꢁ
INPUT COMMON MODE VOLTAGE ꢂELATIVE TO V
ꢀVꢁ
MID
MID
660025 G13
660025 G14
Distortion
vs Output Common Mode Level
Supply Current
vs Total Supply Voltage
32
30
28
26
24
22
20
18
16
–40
–50
2ND HAꢂMONIC,
= 3V
V
S
T
T
= 85°C
= 25°C
A
A
3ꢂD HAꢂMONIC,
= 3V
V
S
2ND HAꢂMONIC,
= 5V
–60
V
S
3ꢂD HAꢂMONIC,
= 5V
–70
V
S
2ND HAꢂMONIC,
5V
3ꢂD HAꢂMONIC,
5V
–80
V
=
S
V
=
S
T
= –40°C
–90
A
–100
2V 1MHz INPUT, ꢂ = 1580ꢄ, GAIN = 1
P-P
IN
–110
2
3
4
5
6
7
8
9
10
–1.5 –1.0 –0.5
0
2.0 2.5
0.5 1.0 1.5
TOTAL SUPPLY VOLTAGE ꢀVꢁ
VOLTAGE V
TO V
ꢀVꢁ
MID
OCM
660025 G16
660025 G15
Transient Response Gain = 1
V
+
OUT
50mV/DIV
DIFFEꢂENTIAL
INPUT
200mV/DIV
660025 G17
500ns/DIV
660025fb
6
LT6600-2.5
(DFN/SO)
PIN FUNCTIONS
–
+
IN and IN (Pins 1, 12/Pins 1, 8): Input Pins. Signals can
should be as close as possible to the IC. For dual supply
+
–
be applied to either or both input pins through identical
applications, bypass V to ground and V to ground with
a quality 0.1ꢃF ceramic capacitor.
externalresistors,ꢂ .TheDCgainfromdifferentialinputs
IN
to the differential outputs is 1580Ω/ꢂ .
+
–
IN
OUT and OUT (Pins 6, 7/Pins 4, 5): Output Pins. These
arethefilterdifferentialoutputs.Eachpincandrivea100Ω
and/or 50pF load to AC ground.
NC (Pins 2, 5, 11/NA): No Connection
V
OCM
(Pin3/Pin2):DCCommonModeꢂeferenceVoltage-
for the 2nd Filter Stage. Its value programs the common
mode voltage of the differential output of the filter. This
is a high impedance input, which can be driven from an
V
(Pin 10/Pin 7): The V
pin is internally biased at
MID
MID
mid-supply, see Block Diagram. For single supply op-
eration, the V
pin should be bypassed with a quality
MID
–
external voltage reference, or it can be tied to V
on the
0.01ꢃFceramiccapacitortoV . Fordualsupplyoperation,
MID
PCboard.V
shouldbebypassedwitha0.01ꢃFceramic
V
MID
can be bypassed or connected to a high quality DC
OCM
capacitor unless it is connected to a ground plane.
ground. A ground plane should be used. A poor ground
will increase noise and distortion. V sets the output
+
–
MID
V and V (Pins 4, 8, 9/Pins 3, 6): Power Supply Pins. For
common mode voltage of the 1st stage of the filter. It has
a 5.5kΩ impedance, and it can be overridden with an
external low impedance voltage source.
–
a single 3.3V or 5V supply ꢀV groundedꢁ a quality 0.1ꢃF
ceramic bypass capacitor is required from the positive
+
–
supplypinꢀV ꢁtothenegativesupplypinꢀV ꢁ. Thebypass
660025fb
7
LT6600-2.5
BLOCK DIAGRAM
ꢂ
IN
+
+
–
–
V
IN
V
MID
OUT
V
IN
+
V
11k
11k
PꢂOPꢂIETAꢂY
LOWPASS
FILTEꢂ STAGE
1580ꢄ
800ꢄ
–
V
OP AMP
800ꢄ
800ꢄ
+
+
OCM
–
–
V
V
OCM
+
+
–
–
800ꢄ
1580ꢄ
660025 BD
–
–
+
+
V
OCM
V
IN
IN
V
OUT
ꢂ
IN
660025fb
8
LT6600-2.5
APPLICATIONS INFORMATION
Interfacing to the LT6600-2.5
DC coupled. The common mode input voltage is 0.5V, and
the differential input voltage is 2V . The common mode
P-P
Note: The referenced pin numbers correspond to the S8
package. See the Pin Functions for the equivalent DFN-12
package pin numbers.
output voltage is 1.65V, and the differential output voltage
is2V forfrequenciesbelow2.5MHz.Thecommonmode
P-P
output voltage is determined by the voltage at V
. Since
OCM
The LT6600-2.5 requires two equal external resistors, ꢂ ,
V
is shorted to V , the output common mode is the
IN
OCM
MID
to set the differential gain to 1580Ω/ꢂ . The inputs to the
mid-supply voltage. In addition, the common mode input
IN
+
–
filter are the voltages V and V presented to the see
voltage can be equal to the mid-supply voltage of V
.
IN
IN
MID
external components, Figure 1. The difference between
Figure2showshowtoACcouplesignalsintotheLT6600-2.5.
In this instance, the input is a single-ended signal. AC cou-
pling allows the processing of single-ended or differential
signals with arbitrary common mode levels. The 0.1ꢃF
coupling capacitor and the 1580Ω gain setting resistor
form a high pass filter, attenuating signals below 1kHz.
Larger values of coupling capacitors will proportionally
reduce this highpass 3dB frequency.
+
–
V
and V is the differential input voltage. The aver-
IN
IN
+
–
age of V and V is the common mode input voltage.
IN
IN
+
–
Similarly,thevoltagesV
andV
appearingatPins4
OUT
OUT
and 5 of the LT6600-2.5 are the filter outputs. The differ-
+
–
ence between V
and V
is the differential output
OUT
OUT
+
–
voltage. The average of V
mode output voltage.
and V
is the common
OUT
OUT
Figure 1 illustrates the LT6600-2.5 operating with a single
3.3V supply and unity passband gain; the input signal is
In Figure 3 the LT6600-2.5 is providing 12dB of gain. The
common mode output voltage is set to 2V.
3.3V
0.1μF
V
V
3
–
1580ꢄ
3
2
1
0
3
2
1
0
1
7
2
8
–
+
V
V
4
IN
+
–
+
–
V
V
+
OUT
V
OUT
LT6600-2.5
+
V
0.01μF
1580ꢄ
IN
V
OUT
–
OUT
5
+
IN
6
t
t
–
660025 F01
V
IN
Figure 1. (S8 Pin Numbers)
3.3V
0.1μF
V
V
0.1μF
0.1μF
3
1580Ω
1
7
2
8
3
2
1
0
2
1
–
4
+
+
–
V
V
+
OUT
V
V
OUT
LT6600-2.5
+
V
IN
0.01μF
–
OUT
–
0
t
+
OUT
5
V
+
IN
1580Ω
6
t
–1
660025 F02
Figure 2. (S8 Pin Numbers)
5V
0.1μF
V
V
3
402ꢄ
1
–
3
3
2
1
0
V
–
4
IN
+
–
+
–
V
V
OUT
+
7
2
8
OUT
LT6600-2.5
2
1
V
0.01μF
402ꢄ
OUT
V
OUT
500mV ꢀDIFFꢁ
P-P
–
+
5
V
IN
+
+
V
V
IN
6
t
t
660025 F03
0
–
+
2V
IN
–
Figure 3. (S8 Pin Numbers)
660025fb
9
LT6600-2.5
APPLICATIONS INFORMATION
Use Figure 4 to determine the interface between the
LT6600-2.5 and a current output DAC. The gain, or “trans-
Figure 5 is a laboratory setup that can be used to charac-
terizetheLT6600-2.5usingsingle-endedinstrumentswith
50Ω source impedance and 50Ω input impedance. For a
12dB gain configuration the LT6600-2.5 requires a402Ω
source resistance yet the network analyzer output is
calibrated for a 50Ω load resistance. The 1:1 transformer,
53.6Ω and 388Ω resistors satisfy the two constraints
above. The transformer converts the single-ended source
into a differential stimulus. Similarly, the output of the
LT6600-2.5 will have lower distortion with larger load
resistance yet the analyzer input is typically 50Ω. The 4:1
turns ꢀ16:1 impedanceꢁ transformer and the two 402Ω
resistors of Figure 5, present the output of the LT6600-2.5
with a 1600Ω differential load, or the equivalent of 800Ω
to ground at each output. The impedance seen by the
network analyzer input is still 50Ω, reducing reflections in
the cabling between the transformer and analyzer input.
impedance,” is defined as A = V /I . To compute the
OUT IN
transimpedance, use the following equation:
1580 •R1
A =
Ω
( )
R1+R2
(
)
By setting ꢂ1 + ꢂ2 = 1580Ω, the gain equation reduces
to A = ꢂ1ꢀΩꢁ.
The voltage at the pins of the DAC is determined by ꢂ1,
ꢂ2, the voltage on V
and the DAC output current.
MID
Consider Figure 4 with ꢂ1 = 49.9Ω and ꢂ2 = 1540Ω. The
voltage at V , for V = 3.3V, is 1.65V. The voltage at the
MID
S
DAC pins is given by:
R1
R1•R2
R1+R2
VDAC = VPIN7
•
+I •
IN
R1+R2+1580
= 26mV +I • 48.3Ω
IN
Differential and Common Mode Voltage Ranges
+
–
Therail-to-railoutputstageoftheLT6600-2.5canprocess
large differential signal levels. On a 3V supply, the output
I is I or I . The transimpedance in this example is
IN
49.6Ω.
IN
IN
signal can be 5.1V . Similarly, a 5V supply can support
P-P
Evaluating the LT6600-2.5
signals as large as 8.8V . To prevent excessive power
P-P
dissipation in the internal circuitry, the user must limit
The low impedance levels and high frequency operation
of the LT6600-2.5 require some attention to the matching
networks between the LT6600-2.5 and other devices. The
previous examples assume an ideal ꢀ0Ωꢁ source imped-
ance and a large ꢀ1kΩꢁ load resistance. Among practical
examples where impedance must be considered is the
evaluation of the LT6600-2.5 with a network analyzer.
differential signal levels to 9V
.
P-P
The two amplifiers inside the LT6600-2.5 have indepen-
dent control of their output common mode voltage ꢀsee
the “Block Diagram” sectionꢁ. The following guidelines
will optimize the performance of the filter.
2.5V
CUꢂꢂENT
OUTPUT
DAC
0.1μF
3.3V
COILCꢂAFT
TTWB-16A
4:1
COILCꢂAFT
TTWB-1010
0.1μF
4
NETWOꢂK
ANALYZEꢂ
SOUꢂCE
NETWOꢂK
ANALYZEꢂ
INPUT
3
388ꢄ
1:1
1
7
2
8
402ꢄ
–
3
ꢂ2
ꢂ2
–
4
I
I
IN
1
7
2
8
+
–
+
–
50ꢄ
V
V
+
LT6600-2.5
OUT
OUT
53.6ꢄ
50ꢄ
ꢂ1
+
402ꢄ
0.01μF
LT6600-2.5
–
5
+
–
IN
5
388ꢄ
+
6
0.1μF
660025 F04
660025 F05
6
+
+
–
ꢂ1
V
– V
1580 • ꢂ1
ꢂ1 + ꢂ2
OUT
OUT
–
=
I
– I
IN
IN
–2.5V
Figure 4. (S8 Pin Numbers)
Figure 5. (S8 Pin Numbers)
660025fb
10
LT6600-2.5
APPLICATIONS INFORMATION
ply voltage and signals that swing between ground and
a positive voltage in a single supply system ꢀFigure 1ꢁ.
The range of allowable input common mode voltage ꢀthe
V
can be allowed to float, but it must be bypassed to
MID
an AC ground with a 0.01ꢃF capacitor or some instability
maybeobserved.V canbedrivenfromalowimpedance
MID
+
–
–
average of V and V in Figure 1ꢁ is determined by
source, provided it remains at least 1.5V above V and at
IN
IN
+
the power supply level and gain setting ꢀsee “Electrical
Characteristics”ꢁ.
least 1.5V below V . An internal resistor divider sets the
voltage of V . While the internal 11k resistors are well
MID
matched, their absolute value can vary by 20ꢅ. This
Common Mode DC Currents
should be taken into consideration when connecting an
external resistor network to alter the voltage of V
.
MID
InapplicationslikeFigure1andFigure3wheretheLT6600-2.5
not only provides lowpass filtering but also level shifts the
common mode voltage of the input signal, DC currents
will be generated through the DC path between input and
output terminals. Minimize these currents to decrease
power dissipation and distortion.
V
can be shorted to V
for simplicity. If a different
OCM
MID
common mode output voltage is required, connect V
OCM
to a voltage source or resistor network. For 3V and 3.3V
supplies the voltage at V must be less than or equal
OCM
to the mid supply level. For example, voltage ꢀV
ꢁ ≤
OCM
1.65V on a single 3.3V supply. For power supply voltages
higher than 3.3V the voltage at V can be set above mid
Consider the application in Figure 3. V
sets the output
MID
OCM
commonmodevoltageofthe1stdifferentialamplifierinside
the LT6600-2.5 ꢀsee the “Block Diagram” sectionꢁat 2.5V.
Since the input common mode voltage is near 0V, there
will be approximately a total of 2.5V drop across the series
combination of the internal 1580Ω feedback resistor and
the external 402Ω input resistor. The resulting 1.25mA
common mode DC current in each input path,must be
supply, as shown in Table 1. The voltage on V
should
OCM
not exceed 1V below the voltage on V . V
is a high
MID OCM
impedance input.
Table 1. Output Common Range for Various Supplies
SUPPLY
VOLTAGE
DIFFERENTIAL OUT
VOLTAGE SWING
OUTPUT COMMON MODE
RANGE FOR LOW DISTORTION
+
–
absorbed by the sources V and V . V sets the
3V
4V
P-P
2V
P-P
1V
P-P
8V
P-P
4V
P-P
2V
P-P
1V
P-P
9V
P-P
4V
P-P
2V
P-P
1V
P-P
1.4V ≤ V ≤ 1.6V
OCM
IN
IN
OCM
common mode output voltage of the 2nd differential
amplifier inside the LT6600-2.5, and therefore sets the
common mode output voltage of the filter. Since, in the
1V ≤ V
≤ 1.6V
OCM
0.75V ≤ V
≤ 1.6V
≤ 2.6V
≤ 3.5V
OCM
OCM
OCM
5V
2.4V ≤ V
1.5V ≤ V
example of Figure 3, V
differs from V
by 0.5V, an
OCM
MID
additional 625ꢃA ꢀ312ꢃA per sideꢁ of DC current will flow
intheresistorscouplingthe1stdifferentialamplifieroutput
stage to filter output. Thus, a total of 3.125mA is used to
translate the common mode voltages.
1V ≤ V
≤ 3.75V
OCM
0.75V ≤ V
≤ 3.75V
≤ 2V
OCM
5V
–2V ≤ V
–3.5V ≤ V
–3.75V ≤ V
–4.25V ≤ V
OCM
OCM
OCM
OCM
≤ 3.5V
≤ 3.75V
≤ 3.75V
A simple modification to Figure 3 will reduce the DC com-
mon mode currents by 36ꢅ. If V is shorted toV
the
MID
OCM
NOTE: V
is set by the voltage at this ꢂ . The voltage at V
MID
should not exceed 1V below
OCM
IN
OCM
common mode output voltage of both op amp stages will
be 2V and the resulting DC current will be 2mA. Of course,
by AC coupling the inputs of Figure 3, the common mode
DC current can be reduced to 625ꢃA.
the voltage at V . To achieve some of the output common mode ranges shown in the table, the
voltage at V
must be set externally to a value below mid supply.
MID
The LT6600-2.5 was designed to process a variety of input
signals including signals centered around the mid-sup-
660025fb
11
LT6600-2.5
APPLICATIONS INFORMATION
Noise
50
40
30
20
10
0
100
80
60
40
20
0
ThenoiseperformanceoftheLT6600-2.5canbeevaluated
with the circuit of Figure 6.
SPECTꢂAL DENSITY
Given the low noise output of the LT6600-2.5 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.
INTEGꢂATED
2.5V
0.01
0.1
1
10
0.1μF
SPECTꢂUM
FꢂEQUENCY ꢀMHzꢁ
COILCꢂAFT
ANALYZEꢂ
660025 F07
ꢂ
ꢂ
3
TTWB-1010
1:1
IN
IN
V
IN
INPUT
1
7
2
8
25ꢄ
25ꢄ
–
4
+
Figure 7. Input Referred Noise, Gain = 1
LT6600-2.5
50Ω
–
5
+
0.1μF
Figure 7 is plot of the noise spectral density as a function
6
660025 F06
of frequency for an LT6600-2.5 with ꢂ = 1580Ω using
IN
the fixture of Figure 6 ꢀthe instrument noise has been
–2.5V
subtracted from the resultsꢁ.
Figure 6. (S8 Pin Numbers)
The noise at each output is comprised of a differential
component and a common mode component. Using a
transformerorcombinertoconvertthedifferentialoutputs
tosingle-endedsignalrejectsthecommonmodenoiseand
gives a true measure of the S/N achievable in the system.
Conversely,ifeachoutputismeasuredindividuallyandthe
noise power added together, the resulting calculated noise
level will be higher than the true differential noise.
Example: With the IC removed and the 25Ω resistors-
grounded,Figure6,measurethetotalintegratednoiseꢀe ꢁ
S
of the spectrum analyzer from 10kHz to 2.5MHz. With the
IC inserted, the signal source ꢀV ꢁ disconnected, and the
IN
inputresistorsgrounded,measurethetotalintegratednoise
out of the filter ꢀe ꢁ. With the signal source connected, set
O
the frequency to 100kHz and adjust the amplitude until
V measures 100mV . Measure the output amplitude,
IN
P-P
Power Dissipation
V
OUT
, and compute the passband gain A = V /V . Now
OUT IN
TheLT6600-2.5amplifierscombinehighspeedwithlarge-
signal currents in a small package. There is a need to
ensurethatthedie’sjunctiontemperaturedoesnotexceed
150°C. The LT6600-2.5 S8 package has Pin 6 fused to the
lead frame to enhance thermal conduction when connect-
ing to a ground plane or a large metal trace. Metal trace
and plated through-holes can be used to spread the heat
generated by the device to the backside of the PC board.
For example, on a 3/32” Fꢂ-4 board with 2oz copper,
a totalof 660 square millimeters connected to Pin 6 of
theLT6600-2.5 S8 ꢀ330 square millimeters on each side
compute the input referred integrated noise ꢀe ꢁ as:
IN
(eO)2 –(eS)2
eIN =
A
Table 2 lists the typical input referred integrated noise for
various values of ꢂ .
IN
Table 2. Noise Performance
INPUT REFERRED
INTEGRATED NOISE
10kHz TO 2.5MHz
INPUT REFERRED
INTEGRATED NOISE
10kHz TO 5MHz
PASSBAND
GAIN (V/V)
R
IN
4
2
1
402Ω
806Ω
18ꢃV
29ꢃV
51ꢃV
23ꢃV
39ꢃV
73ꢃV
ꢂMS
ꢂMS
ꢂMS
ꢂMS
ꢂMS
ꢂMS
of the PC boardꢁ will result in a thermal resistance, θ ,
JA
of about 85°C/W. Without the extra metal trace connected
1580Ω
660025fb
12
LT6600-2.5
APPLICATIONS INFORMATION
to the V pin to provide a heat sink, the thermal resistance
will be around 105°C/W. Table 3 can be used as a guide
when considering thermal resistance.
–
Foragivensupplyvoltage,theworst-casepowerdissipation
occurs when the differential input signal is maximum, the
common mode currents are maximum ꢀsee Applications
Information regarding Common Mode DC Currentsꢁ, the
load impedance is small and the ambient temperature is
maximum.Tocomputethejunctiontemperature,measure
the supply current under these worst-case conditions, es-
timate the thermal resistance from Table 2, then apply the
Table 3. LT6600-2.5 SO-8 Package Thermal Resistance
COPPER AREA
TOPSIDE BACKSIDE BOARD AREA
THERMAL RESISTANCE
(mm2)
1100
330
35
(mm2)
1100
330
35
(mm2)
2500
2500
2500
2500
2500
(JUNCTION-TO-AMBIENT)
65°C/W
85°C/W
95°C/W
100°C/W
105°C/W
equation for T . For example, using the circuit in Figure 3
J
with DC differential input voltage of 1V, a differential
output voltage of 4V, no load resistance and an ambient
35
0
+
temperature of 85°C, the supply current ꢀcurrent into V ꢁ
0
0
measures 37.6mA. Assuming a PC board layout with a
2
Junction temperature, T , is calculated from the ambient-
35mm copper trace, the θ is 100°C/W. The resulting
J
JA
temperature, T , and power dissipation, P . The power
junction temperature is:
A
D
dissipation is the product of supply voltage, V , and
S
T = T + ꢀP • θ ꢁ = 85 + ꢀ5 • 0.0376 • 100ꢁ = 104°C
J
A
D
JA
supply current, I . Therefore, the junction temperature
S
When using higher supply voltages or when driving small
is given by:
impedances, more copper may be necessary to keep T
below 150°C.
J
T = T + ꢀP • θ ꢁ = T + ꢀV • I • θ ꢁ
J
A
D
JA
A
S
S
JA
wherethesupplycurrent,I ,isafunctionofsignallevel,load
S
impedance, temperature and common mode voltages.
660025fb
13
LT6600-2.5
PACKAGE DESCRIPTION
DF Package
12-Lead Plastic DFN (4mm × 4mm)
ꢀꢂeference LTC DWG # 05-08-1733 ꢂev Øꢁ
2.50 REF
0.70 0.05
3.38 0.05
2.65 0.05
4.50 0.05
3.10 0.05
PACKAGE OUTLINE
0.25 0.05
0.50 BSC
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED
4.00 0.10
(4 SIDES)
2.50 REF
7
12
0.40 0.10
3.38 0.10
2.65 0.10
PIN 1 NOTCH
R = 0.20 TYP OR
0.35 × 45°
PIN 1
TOP MARK
(NOTE 6)
CHAMFER
(DF12) DFN 0806 REV Ø
6
R = 0.115
TYP
1
0.25 0.05
0.50 BSC
0.200 REF
0.75 0.05
BOTTOM VIEW—EXPOSED PAD
0.00 – 0.05
NOTE:
1. DRAWING IS PROPOSED TO BE MADE A JEDEC PACKAGE OUTLINE MO-220
VARIATION (WGGD-X)—TO BE APPROVED
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION
ON THE TOP AND BOTTOM OF PACKAGE
660025fb
14
LT6600-2.5
PACKAGE DESCRIPTION
S8 Package
8-Lead Plastic Small Outline (Narrow .150 Inch)
ꢀꢂeference LTC DWG # 05-08-1610ꢁ
.189 – .197
(4.801 – 5.004)
.045 ±.005
NOTE 3
.050 BSC
7
5
8
6
.245
MIN
.160 ±.005
.150 – .157
(3.810 – 3.988)
.228 – .244
(5.791 – 6.197)
NOTE 3
.030 ±.005
TYP
1
3
4
2
RECOMMENDED SOLDER PAD LAYOUT
.010 – .020
(0.254 – 0.508)
× 45°
.053 – .069
(1.346 – 1.752)
.004 – .010
(0.101 – 0.254)
.008 – .010
(0.203 – 0.254)
0°– 8° TYP
.016 – .050
(0.406 – 1.270)
.050
(1.270)
BSC
.014 – .019
(0.355 – 0.483)
TYP
NOTE:
INCHES
1. DIMENSIONS IN
(MILLIMETERS)
2. DRAWING NOT TO SCALE
3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
SO8 0303
660025fb
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
15
LT6600-2.5
TYPICAL APPLICATION
5th Order Lowpass Filter (S8 Pin Numbers Shown)
+
V
0.1μF
ꢂ
ꢂ
3
1
–
+
V
V
–
IN
IN
4
+
–
V
OUT
7
2
+
LT6600
C
V
–
6
8
OUT
5
+
ꢂ
ꢂ
0.1μF
1
C =
2π • ꢂ • 2.5MHz
1580ꢄ
2ꢂ
–
V
GAIN =
, MAXIMUM GAIN = 4
660025 TA02a
Amplitude Response
Transient Response Gain = 1
10
V
= 2.5V
S
GAIN = 1
ꢂ = 787ꢄ
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
V
+
OUT
T
A
= 25°C
50mV/DIV
DIFFEꢂENTIAL
INPUT
200mV/DIV
660025 TA02c
500ns/DIV
100k
1M
10M 20M
FꢂEQUENCY ꢀHzꢁ
660025 TA02b
RELATED PARTS
PART NUMBER
LTC®1565-31
LTC1566-1
LT1567
DESCRIPTION
COMMENTS
650kHz Linear Phase Lowpass Filter
Low Noise, 2.3MHz Lowpass Filter
Continuous Time, SO8 Package, Fully Differential
Continuous Time, SO8 Package
Very Low Noise, High Frequency Filter Building Block
Very Low Noise, 4th Order Building Block
Low-Power Differential In/Out Amplifier
Low-Power Differential In/Out Amplifier
Low-Power Differential In/Out Amplifier
Low-Power Differential In/Out Amplifier
Low-Power Differential In/Out Amplifier
1.4nV/√Hz Op Amp, MSOP Package, Fully Differential
Lowpass and Bandpass Filter Designs Up to 10MHz, Differential Outputs
Adjustable Gain, MSOP Package
LT1568
LTC1992
LTC1992-1
LTC1992-2
LTC1992-5
LTC1992-10
LT6600-10
Fixed Gain of 1, Matching 0.3ꢅ
Fixed Gain of 2, Matching 0.3ꢅ
Fixed Gain of 5, Matching 0.3ꢅ
Fixed Gain of 10, Matching 0.3ꢅ
Very Low Noise Differential Amplifier and 10MHz
Lowpass Filter
82dB S/N with 3V Supply, SO-8 Package
LT6600-20
Very Low Noise Differential Amplifier and 20MHz
Lowpass Filter
76dB S/N with 3V Supply, SO-8 Package
660025fb
LT 0408 REV B • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
16
●
●
© LINEAR TECHNOLOGY CORPORATION 2003
ꢀ408ꢁ 432-1900 FAX: ꢀ408ꢁ 434-0507 www.linear.com
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