LT6604-2.5 Linear Technology, LT6604-2.5 Datasheet

no-image

LT6604-2.5

Manufacturer Part Number
LT6604-2.5
Description
Dual Very Low Noise Differential Amplifier and 2.5MHz Lowpass Filter
Manufacturer
Linear Technology
Datasheet
FEATURES
APPLICATIONS
n
n
n
n
n
n
n
n
n
n
n
n
n
n
TYPICAL APPLICATION
Dual Differential Amplifi er with 2.5MHz Lowpass Filters
>86dB Signal-to-Noise (3V Supply, 1V
Low Distortion (1MHz, 1V
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 and Filter
Single-Ended to Differential Converter
Matched, Dual, Differential Gain or 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
+
+
0.01μF
0.01μF
4th Order Filters
Approximates Chebyshev Response
Guaranteed Phase and Gain Matching
Resistor-Programmable Differential Gain
HD2: 92dBc
HD3: 88dBc
1580Ω
1580Ω
1580Ω
1580Ω
LT6604-2.5
+INA
V
V
–INA
+INB
V
V
–INB
MIDA
OCMA
MIDB
OCMB
+
+
+
+
V
RMS
–OUTB
+OUTB
–OUTA
+OUTA
V
V
V
+
+
+
A
B
B
Output, 800Ω Load)
3V
3V
50Ω
50Ω
50Ω
50Ω
RMS
Output)
18pF
18pF
LTC22xx
AIN
AIN
+
+
3V
DOUT
DOUT
DESCRIPTION
The LT
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
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
DUAL ADC
660425 TA01
Differential Amplifi er and
®
P-P
6604-2.5 consists of two matched, fully differential
signal level for a single 3V supply.
2.5MHz Lowpass Filter
Dual Very Low Noise,
18
16
14
12
10
8
6
4
2
0
–0.25
Channel to Channel Gain Matching
50 TYPICAL UNITS
T
GAIN = 1
f
IN
A
= 25°C
= 2.5MHz
–0.15
GAIN MATCH (dB)
–0.05
www.DataSheet4U.com
0
LT6604-2.5
0.05
0.15
660425 TA01b
0.25
660425f
1

Related parts for LT6604-2.5

LT6604-2.5 Summary of contents

Page 1

... 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 signal level for a single 3V supply. ...

Page 2

... LT6604-2.5 ABSOLUTE MAXIMUM RATINGS (Note 1) 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

... 1MHz 800Ω IN RMS IN L 2nd Harmonic 3rd Harmonic 1MHz IN P-P IN Measured Between OUT+ and OUT–, V Shorted to V OCM LT6604-2.5 www.DataSheet4U.com + – 5V 0V 1580Ω, and S IN MIN TYP MAX 0.04 0.4 l 0.005 0.1 l 0.02 0.3 l 0.03 0.4 l 0.05 0.6 l ...

Page 4

... LT6604-2.5 ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are 1k. LOAD PARAMETER Input Bias Current Input Referred Differential Offset Differential Offset Drift Input Common Mode Voltage (Note 3) Output Common Mode Voltage (Note 5) Output Common Mode Offset (with Respect ...

Page 5

... HARMONIC SINGLE-ENDED INPUT, –80 3RD HARMONIC – –100 R = 800Ω EACH OUTPUT GAIN = 1 –110 0 FREQUENCY (MHz) LT6604-2.5 www.DataSheet4U.com Passband Gain and Group Delay 12 320 GAIN 11 300 10 280 9 260 240 8 7 220 GROUP DELAY 6 200 5 180 V ...

Page 6

... LT6604-2.5 TYPICAL PERFORMANCE CHARACTERISTICS Distortion vs Signal Level –40 2ND HARMONIC, DIFFERENTIAL INPUT –50 3RD HARMONIC, DIFFERENTIAL INPUT 2ND HARMONIC, –60 SINGLE-ENDED INPUT 3RD HARMONIC, –70 SINGLE-ENDED INPUT –80 – 1MHz R = 800Ω AT –100 L EACH OUTPUT GAIN = 1 –110 ...

Page 7

... Output Pins. Pins 19 and 21 are the fi lter differential outputs for channel B. With a typical short-circuit current limit greater than ±40mA, each pin can drive a 100Ω and/or 50pF load to AC ground. LT6604-2.5 www.DataSheet4U.com ...

Page 8

... LT6604-2.5 PIN FUNCTIONS +OUTA, – OUTA (Pins 27, 29): Output Pins. Pins 27 and 29 are the fi lter differential outputs for channel A. With a typical short-circuit current greater than ±40mA, each pin can drive a 100Ω and/or 50pF load to AC ground. V (Pin 34): The V pin is internally biased at mid- ...

Page 9

... V and V is the common mode input voltage Similarly, the voltages V and V OUT OUT 27 and 29 of the LT6604-2.5 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 OUT mode output voltage ...

Page 10

... Figure laboratory setup that can be used to char- acterize the LT6604-2.5 using single-ended instruments with 50Ω source impedance and 50Ω input impedance. For a 12dB gain confi guration the LT6604-2.5 requires a 402Ω source resistance yet the network analyzer output is calibrated for a 50Ω load resistance. The 1:1 transformer, ...

Page 11

... OCM The noise performance of the LT6604-2.5 channel can be evaluated with the circuit of Figure 6. Given the low noise output of the LT6604-2.5 and the 6dB attenuation of the transformer coupling network necessary to measure the noise fl oor of the spectrum analyzer and subtract the instrument noise from the fi ...

Page 12

... There is a need to en- sure that the die’s junction temperature does not exceed 150°C. The LT6604-2.5 has an exposed pad (pin 35) which is connected to the negative supply (V pad to a ground plane helps to dissipate the heat generated by the chip ...

Page 13

... LT6604-2 OUT – 1580Ω 0.1μF –5V 5V 0.1μF 1580Ω – 1/2 8 LT6604-2 OUT – 1580Ω 0.1μF –5V 660425 TA02a LT6604-2.5 Output Spectrum 108 120 FREQUENCY (MHz) 660025 TA02c 660425f 13 ...

Page 14

... C = 2π • R • 2.5MHz – V 1580Ω GAIN = 0.1μ 787Ω 787Ω – – 1 LT6604-2.5 14 82pF – 787Ω 787Ω 0.1μF – ±2.5V S GAIN = 787Ω V OUT T = 25°C ...

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 LT6604-2.5 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

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

Related keywords