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LT6604IUFF-2.5#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
LT6604-2.5
1
660425fa
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
Dual Very Low Noise,
Differential Amplifi er and
2.5MHz Lowpass Filter
The LT
®
6604-2.5 consists of two matched, fully differential
amplifi ers, each with a 4th order, 2.5MHz lowpass fi lter. The
fi xed frequency lowpass fi lter approximates a Chebyshev
response. By integrating a fi lter and a differential ampli-
fi er, distortion and noise are made exceptionally low. At
unity gain, the measured in-band signal-to-noise ratio is
an impressive 86dB. At higher gains, the input referred
noise decreases, allowing the part to process smaller
input differential signals without signifi cantly degrading
the signal-to-noise ratio.
Gain and phase are well matched between the two chan-
nels. Gain for each channel is independently programmed
using two external resistors. The LT6604-2.5 enables level
shifting by providing an adjustable output common mode
voltage, making it ideal for directly interfacing to ADCs.
The LT6604-2.5 is fully specifi ed for 3V operation. The
differential design enables outstanding performance up
to a 4V
P-P
signal level for a single 3V supply.
See the back page of this datasheet for a complete list of
related single and dual differential amplifi ers with integrated
2.5MHz to 20MHz lowpass fi lters.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.v
n
Dual Differential Amplifi er with 2.5MHz Lowpass Filters
4th Order Filters
Approximates Chebyshev Response
Guaranteed Phase and Gain Matching
Resistor-Programmable Differential Gain
n
>86dB Signal-to-Noise (3V Supply, 1V
RMS
Output)
n
Low Distortion (1MHz, 1V
RMS
Output, 800Ω Load)
HD2: 92dBc
HD3: 88dBc
n
Specifi ed for Operation with 3V, 5V and ±5V Supplies
n
Fully Differential Inputs and Outputs
n
Adjustable Output Common Mode Voltage
n
Small 4mm × 7mm × 0.75mm QFN Package
n
Dual Differential ADC Driver and Filter
n
Single-Ended to Differential Converter
n
Matched, Dual, Differential Gain or Filter Stage
n
Common Mode Translation of Differential Signals
n
High Speed ADC Antialiasing and DAC Smoothing in
Wireless Infrastructure or Networking Applications
n
High Speed Test and Measurement Equipment
n
Medical Imaging
Channel to Channel Gain Matching
GAIN MATCH (dB)
NUMBER OF UNITS
18
16
14
12
10
8
6
4
2
660425 TA01b
0
50 TYPICAL UNITS
T
A
= 25°C
GAIN = 1
f
IN
= 2.5MHz
–0.25 0.05–0.05 0.15–0.15 0.250
1580Ω
50Ω
50Ω
1580Ω
3V
3V
+
–
+
–
660425 TA01
+
–
DOUT
DUAL ADC
AIN
LT6604-2.5 LTC22xx
+
–
1580Ω
1580Ω
3V
V
+
A
–OUTA
+OUTA
–OUTB
+OUTB
V
+
BV
+
B
+INA
+INB
V
MIDA
V
MIDB
V
OCMA
V
OCMB
–INA
–INB
V
–
+
–
+
–
+
–
DOUTAIN
+
–
50Ω
50Ω
18pF
0.01μF
0.01μF
18pF
LT6604-2.5
2
660425fa
PIN CONFIGURATION ABSOLUTE MAXIMUM RATINGS
Total Supply Voltage .................................................11V
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
Input Current
+IN, –IN, V
OCM
, V
MID
(Note 8) ........................±10mA
(Note 1)
31 V
–
32 V
–
33 NC
34 V
MIDA
V
+
B 17
NC 16
NC 15
V
OCMB
14
35
30 NC
29 –OUTA
28 NC
27 +OUTA
26 NC
25 V
+
A
24 V
–
23 NC
22 NC
21 –OUTB
20 NC
19 +OUTB
18 NC
NC 1
+INA 2
NC 3
–INA 4
NC 5
V
OCMA
6
V
–
7
V
MIDB
8
NC 9
+INB 10
NC 11
–INB 12
NC 13
TOP VIEW
UFF PACKAGE
34-LEAD (4mm s 7mm) PLASTIC QFN
T
JMAX
= 150°C, θ
JA
= 43°C/W, θ
JC
= 4°C/W
EXPOSED PAD (PIN 35) IS V
–
, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE
LT6604CUFF-2.5#PBF LT6604CUFF-2.5#TRPBF 60425
34-Lead (4mm × 7mm) Plastic QFN
0°C to 70°C
LT6604IUFF-2.5#PBF LT6604IUFF-2.5#TRPBF 60425
34-Lead (4mm × 7mm) Plastic QFN
–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.
Consult LTC Marketing for information on non-standard 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/
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
Filter Gain Either Channel, V
S
= 3V V
IN
= 2V
P-P
, f
IN
= DC to 260kHz
V
IN
= 2V
P-P
, f
IN
= 700kHz (Gain Relative to 260kHz)
V
IN
= 2V
P-P
, f
IN
= 1.9MHz (Gain Relative to 260kHz)
V
IN
= 2V
P-P
, f
IN
= 2.2MHz (Gain Relative to 260kHz)
V
IN
= 2V
P-P
, f
IN
= 2.5MHz (Gain Relative to 260kHz)
V
IN
= 2V
P-P
, f
IN
= 7.5MHz (Gain Relative to 260kHz)
V
IN
= 2V
P-P
, f
IN
= 12.5MHz (Gain Relative to 260kHz)
l
l
l
l
l
l
–0.5
–0.15
–0.2
–0.6
–2.1
0.1
0
0.2
0.1
–0.9
–34
–51
0.4
0.1
0.6
0.5
0
– 31
dB
dB
dB
dB
dB
dB
dB
LT6604-2.5
3
660425fa
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
Matching of Filter Gain, V
S
= 3V V
IN
= 2V
P-P
, f
IN
= DC to 260kHz
V
IN
= 2V
P-P
, f
IN
= 700kHz (Gain Relative to 260kHz)
V
IN
= 2V
P-P
, f
IN
= 1.9MHz (Gain Relative to 260kHz)
V
IN
= 2V
P-P
, f
IN
= 2.2MHz (Gain Relative to 260kHz)
V
IN
= 2V
P-P
, f
IN
= 2.5MHz (Gain Relative to 260kHz)
V
IN
= 2V
P-P
, f
IN
= 7.5MHz (Gain Relative to 260kHz)
V
IN
= 2V
P-P
, f
IN
= 12.5MHz (Gain Relative to 260kHz)
l
l
l
l
l
l
0.04
0.005
0.02
0.03
0.05
0.15
0.05
0.4
0.1
0.3
0.4
0.6
1.1
2.8
dB
dB
dB
dB
dB
dB
dB
Matching of Filter Phase, V
S
= 3V V
IN
= 2V
P-P
, f
IN
= 700kHz
V
IN
= 2V
P-P
, f
IN
= 1.9MHz
V
IN
= 2V
P-P
, f
IN
= 2.2MHz
l
l
l
0.2
0.6
0.8
1.5
3.5
4.5
deg
deg
deg
Filter Gain Either Channel, V
S
= 5V V
IN
= 2V
P-P
, f
IN
= DC to 260kHz
V
IN
= 2V
P-P
, f
IN
= 700kHz (Gain Relative to 260kHz)
V
IN
= 2V
P-P
, f
IN
= 1.9MHz (Gain Relative to 260kHz)
V
IN
= 2V
P-P
, f
IN
= 2.2MHz (Gain Relative to 260kHz)
V
IN
= 2V
P-P
, f
IN
= 2.5MHz (Gain Relative to 260kHz)
V
IN
= 2V
P-P
, f
IN
= 7.5MHz (Gain Relative to 260kHz)
V
IN
= 2V
P-P
, f
IN
= 12.5MHz (Gain Relative to 260kHz)
l
l
l
l
l
l
–0.5
–0.15
–0.2
–0.6
–2.1
–0.1
0
0.2
0.1
–0.9
–34
–51
0.4
0.1
0.6
0.5
0
– 31
dB
dB
dB
dB
dB
dB
dB
Matching of Filter Gain, V
S
= 5V V
IN
= 2V
P-P
, f
IN
= DC to 260kHz
V
IN
= 2V
P-P
, f
IN
= 700kHz (Gain Relative to 260kHz)
V
IN
= 2V
P-P
, f
IN
= 1.9MHz (Gain Relative to 260kHz)
V
IN
= 2V
P-P
, f
IN
= 2.2MHz (Gain Relative to 260kHz)
V
IN
= 2V
P-P
, f
IN
= 2.5MHz (Gain Relative to 260kHz)
V
IN
= 2V
P-P
, f
IN
= 7.5MHz (Gain Relative to 260kHz)
V
IN
= 2V
P-P
, f
IN
= 12.5MHz (Gain Relative to 260kHz)
l
l
l
l
l
l
0.04
0.005
0.02
0.03
0.05
0.15
0.05
0.4
0.1
0.3
0.4
0.6
1.1
2.8
dB
dB
dB
dB
dB
dB
dB
Matching of Filter Phase, V
S
= 5V V
IN
= 2V
P-P
, f
IN
= 700kHz
V
IN
= 2V
P-P
, f
IN
= 1.9MHz
V
IN
= 2V
P-P
, f
IN
= 2.2MHz
l
l
l
0.2
0.6
0.8
1.5
3.5
4.5
deg
deg
deg
Filter Gain Either Channel, V
S
= ±5V V
IN
= 2V
P-P
, f
IN
= DC to 260kHz –0.6 –0.1 0.4 dB
Filter Gain, R
IN
= 402Ω V
IN
= 0.5V
P-P
, f
IN
= DC to 260kHz
V
S
= 3V
V
S
= 5V
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, R
IN
= 1580Ω 51 μV
RMS
Distortion (Note 4) V
IN
= 1V
RMS
, f
IN
= 1MHz, R
L
= 800Ω
2nd Harmonic
3rd Harmonic
92
88
dBc
dBc
Channel Separation (Note 9) V
IN
= 2V
P-P
, f
IN
= 1MHz –119 dB
Differential Output Swing Measured Between OUT
+
and OUT
–
, V
OCM
Shorted to V
MID
V
S
= 5V
V
S
= 3V
l
l
8.8
5.1
9.3
5.5
V
P-P_DIFF
V
P-P_DIFF
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LT6604IUFF-2.5#PBF

Mfr. #:
Buy LT6604IUFF-2.5#PBF
Manufacturer:
Analog Devices Inc.
Description:
Differential Amplifiers Dual Differential Amplifier and 2.5MHz Lowpass Filter
Lifecycle:
New from this manufacturer.
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