LT6604-15 Linear Technology, LT6604-15 Datasheet

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LT6604-15

Manufacturer Part Number
LT6604-15
Description
Dual Very Low Noise Differential Amplifier and 15MHz Lowpass Filter
Manufacturer
Linear Technology
Datasheet
APPLICATIONS
TYPICAL APPLICATION
FEATURES
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n
n
n
n
n
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n
0.01μF
0.01μF
Dual Differential Amplifi er with 15MHz Lowpass
Filters
76dB Signal-to-Noise (3V Supply, 2V
Low Distortion, 2V
Specifi ed for Operation with 3V, 5V and ±5V Supplies
Fully Differential Inputs and Outputs
Adjustable Output Common Mode Voltage
Small 4mm × 7mm × 0.75mm QFN Package
Dual Differential ADC Driver Plus Filter
Single-Ended to Differential Converter
Matched, Dual, Differential Filter Stage
Common Mode Translation of Differential Signals
High Speed ADC Antialiasing and DAC Smoothing in
Wireless Infrastructure or Networking Applications
High Speed Test and Measurement Equipment
Medical Imaging
4th Order Filters
Approximates Chebyshev Response
Guaranteed Phase and Gain Matching
Resistor-Programmable Differential Gain
1MHz: 86dBc 2nd, 90dBc 3rd
10MHz: 63dBc 2nd, 69dBc 3rd
+
+
536Ω
536Ω
536Ω
536Ω
LT6604-15
+INA
V
V
–INA
+INB
V
V
–INB
MIDA
OCMA
MIDB
OCMB
+
+
P-P
+
+
V
, 800Ω Load, V
–OUTB
+OUTB
–OUTA
+OUTA
V
V
V
+
+
+
A
B
B
3V
3V
50Ω
50Ω
50Ω
50Ω
P-P
S
= 3V
Output)
18pF
18pF
LTC22xx
AIN
AIN
+
+
3V
DOUT
DOUT
DUAL ADC
660415 TA01
DESCRIPTION
The LT
amplifi ers, each with a 4th order, 15MHz 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 76dB. 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 highly matched between the two chan-
nels. Gain for each channel is independently programmed
using two external resistors. The LT6604-15 enables level
shifting by providing an adjustable output common mode
voltage, making it ideal for directly interfacing to ADCs.
The LT6604-15 is fully specifi ed for 3V operation. The
differential design enables outstanding performance at
a 2V
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.
Differential Amplifi er and
P-P
®
6604-15 consists of two matched, fully differential
signal level for a single 3V supply. See the back
Dual Very Low Noise,
15MHz Lowpass Filter
Channel to Channel Gain Matching
16
14
12
10
8
6
4
2
0
–0.25
50 TYPICAL UNITS
T
GAIN = 1
f
IN
A
= 25°C
= 15MHz
–0.2
–0. 1 5
–0.1
GAIN MATCH (dB)
–0.05
0
0.05
www.DataSheet4U.com
0.1
LT6604-15
0.15
660415 TA01b
0.2
0.25
660415fa
1

Related parts for LT6604-15

LT6604-15 Summary of contents

Page 1

... The LT6604-15 enables level shifting by providing an adjustable output common mode voltage, making it ideal for directly interfacing to ADCs. The LT6604-15 is fully specifi ed for 3V operation. The differential design enables outstanding performance signal level for a single 3V supply. See the back ...

Page 2

... LT6604-15 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 Voltage +IN, –IN (Note 8) ..............................±V ...

Page 3

... OCM – Average of IN and 536Ω ± 133Ω ±5V S LT6604-15 www.DataSheet4U.com + – 536Ω, and R IN LOAD MIN TYP MAX 0.05 0.5 l 0.01 0.1 l 0.02 0.3 l 0.03 0.4 l 0.06 0.6 l 0.13 1.5 l 0.15 2 ...

Page 4

... LT6604-15 ELECTRICAL CHARACTERISTICS range, otherwise specifi cations are PARAMETER Differential Offset Drift Input Common Mode Voltage (Note 3) Output Common Mode Voltage (Note 5) Output Common Mode Offset (with Respect OCM Common Mode Rejection Ratio Voltage at V MID V Input Resistance ...

Page 5

... T = 25°C A –80 –90 –100 –110 0 FREQUENCY (MHz) DIFFERENTIAL INPUT, 2ND HARMONIC DIFFERENTIAL INPUT, 3RD HARMONIC SINGLE-ENDED INPUT, 2ND HARMONIC SINGLE-ENDED INPUT, 3RD HARMONIC LT6604-15 www.DataSheet4U.com Passband Gain and Delay 225 1 180 0 GAIN 135 –1 90 –2 45 –3 DELAY 0 –4 – ...

Page 6

... LT6604-15 TYPICAL PERFORMANCE CHARACTERISTICS Distortion vs Signal Level – ± 800Ω AT EACH OUTPUT L –50 GAIN = 25°C A –60 2ND HARMONIC, 10MHz INPUT –70 3RD –80 HARMONIC, 10MHz INPUT –90 2ND HARMONIC, 1MHz INPUT –100 3RD HARMONIC, 1MHz INPUT –110 ...

Page 7

... IN nel A. It has a 5.5kΩ impedance, and it can be overridden with an external low impedance voltage source. Exposed Pad (Pin 35): V soldered to the PCB. LT6604-15 www.DataSheet4U.com pin is internally biased at mid- MIDA – . The Exposed Pad must be ...

Page 8

... LT6604-15 BLOCK DIAGRAM +INA + –INA – OCMA – MIDB +INB + –INB – MIDA 11k 2 536Ω 11k 3 – AMP 200Ω + – OCM + – ...

Page 9

... V and V is the common mode input voltage Similarly, the voltages V and V OUT OUT 27 and 29 of the LT6604-15 are the fi lter outputs. The dif- + – ference between V and V is the differential output OUT OUT + voltage. The average of V and V ...

Page 10

... LT6604-15 APPLICATIONS INFORMATION In Figure 3 the LT6604-15 is providing 12dB of gain. The gain resistor has an optional 62pF in parallel to improve the passband fl atness near 15MHz. The common mode output voltage is set to 2V. Use Figure 4 to determine the interface between the LT6604-15 and a current output DAC. The gain, or “tran- simpedance,” ...

Page 11

... Input, Gain = 1 above 2V P-P This is illustrated in Figure 6; the LT6604-15 channel was confi gured with unity passband gain and the input of the fi lter was driven with a 1MHz signal. Because this voltage limiting takes place well before the output stage of the fi ...

Page 12

... LT6604-15 APPLICATIONS INFORMATION Common Mode DC Currents In applications like Figure 1 and Figure 3 where the LT6604-15 not only provides lowpass fi ltering 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 ...

Page 13

... The LT6604-15 amplifi ers combine high speed with large signal currents in a small package. There is a need to en- sure that the die’s junction temperature does not exceed 150°C. The LT6604-15 has an Exposed Pad (pin 35) which – is connected to the lower supply ( ground plane helps to dissipate the heat generated by the chip ...

Page 14

... LT6604-15 5.6pF INA 6 25Ω 0.1μF – 5.6pF 3V 0.1μF 5.6pF 17 12 – 25Ω 1/2 8 LT6604-15 5.6pF INB 14 25Ω 0.1μF – 5.6pF GAIN = 536Ω/ CMB 2.2μF www.DataSheet4U.com 3V 0.1μF LTC2299 660415 TA02 660415fa ...

Page 15

... BSC 6.00 REF 6.10 ± 0.05 7.50 ± 0.05 RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED R = 0.10 0.75 ± 0.05 TYP 6.00 REF R = 0.125 0.200 REF TYP 0.00 – 0.05 LT6604-15 www.DataSheet4U.com 0.70 ± 0.05 PACKAGE OUTLINE 1.29 ± 0.05 PIN 1 NOTCH R = 0.30 OR 0.25 × 45° CHAMFER 1.50 REF 33 34 0.40 ± 0. 1.90 ± ...

Page 16

... LT6604-15 RELATED PARTS PART NUMBER DESCRIPTION Integrated Filters th LTC1562-2 Very Low Noise, 8 Order Filter Building Block LTC1565-31 650kHz Linear Phase Lowpass Filter LTC1566-1 Low Noise, 2.3MHz Lowpass Filter th LT1568 Very Low Noise, 4 Order Filter Building Block LTC1569-7 Linear Phase, Tunable 10 LT6600-2.5 Very Low Noise Differential 2 ...

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