LT6604CUFF-2.5-PBF LINER [Linear Technology], LT6604CUFF-2.5-PBF Datasheet

LT6604CUFF-2.5-PBF

Manufacturer Part Number

LT6604CUFF-2.5-PBF

Description

Dual Very Low Noise, Differential Amplifi er and 2.5MHz Lowpass Filter

Manufacturer

LINER [Linear Technology]

Datasheet

1.LT6604CUFF-2.5-PBF.pdf (16 pages)

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FEATURES

APPLICATIONS

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

4th Order Filters

Approximates Chebyshev Response

Guaranteed Phase and Gain Matching

Resistor-Programmable Differential Gain

HD2: 92dBc

HD3: 88dBc

1580Ω

LT6604-2.5

+INA

–INA

+INB

–INB

MIDA

OCMA

MIDB

OCMB

–

RMS

–OUTB

+OUTB

–OUTA

+OUTA

Output, 800Ω Load)

50Ω

RMS

Output)

18pF

LTC22xx

AIN

–

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,

–0.25

Channel to Channel Gain Matching

50 TYPICAL UNITS

GAIN = 1

= 25°C

= 2.5MHz

–0.15

GAIN MATCH (dB)

–0.05

LT6604-2.5

0.05

0.15

660425 TA01b

0.25

660425f

Related parts for LT6604CUFF-2.5-PBF

LT6604CUFF-2.5-PBF Summary of contents

Page 1

FEATURES 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 Low Distortion (1MHz, 1V Output, 800Ω Load) RMS HD2: ...

Page 2

... ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL LT6604CUFF-2.5#PBF LT6604CUFF-2.5#TRPBF LT6604IUFF-2.5#PBF LT6604IUFF-2.5#TRPBF Consult LTC Marketing for parts speciﬁ ed with wider operating temperature ranges. *The temperature grade is identiﬁ label on the shipping container. Consult LTC Marketing for information on non-standard lead based ﬁ nish parts. ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise speciﬁ cations are 1k. LOAD PARAMETER Matching of Filter Gain Matching of Filter Phase Filter Gain Either Channel Matching ...

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 ...

Page 5

TYPICAL PERFORMANCE CHARACTERISTICS Frequency Response 2. 1580Ω GAIN = 1 –12 –24 –36 –48 –60 –72 –84 –96 100k 1M 10M 50M FREQUENCY (Hz) 660425 G01 Output Impedance vs Frequency (OUT+ or ...

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 ...

Page 7

TYPICAL PERFORMANCE CHARACTERISTICS Transient Response Gain = OUT 50mV/DIV DIFFERENTIAL INPUT 200mV/DIV 500ns/DIV PIN FUNCTIONS +INA, –INA (Pins 2, 4): Channel A Input Pins. Signals can be applied to either or both input pins through identical external ...

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 ...

Page 9

APPLICATIONS INFORMATION Interfacing to the LT6604-2.5 Note: The LT6604-2.5 contains two identical lowpass ﬁ lters. The following applications information only refers to one ﬁ lter. The two ﬁ lters are independent except that they share the same negative supply voltage ...

Page 10

LT6604-2.5 APPLICATIONS INFORMATION Use Figure 4 to determine the interface between the LT6604-2.5 and a current output DAC. The gain, or “tran- simpedance,” is deﬁ ned OUT transimpedance, use the following equation: 1580 • ...

Page 11

APPLICATIONS INFORMATION V can be shorted to V for simplicity different OCM MID common mode output voltage is required, connect voltage source or resistor network. For 3V and 3.3V supplies the voltage at V must ...

Page 12

LT6604-2.5 APPLICATIONS INFORMATION input resistors grounded, measure the total integrated noise out of the ﬁ lter (e ). With the signal source connected, set O the frequency to 100kHz and adjust the amplitude until V measures 100mV . Measure the ...

Page 13

TYPICAL APPLICATIONS 16 BIT 4kHz to 2.5MHz DISCRETE MULTI-TONE SIGNAL @ 50MSPS DAC Output Spectrum 0 –10 –20 BASEBAND SIGNAL –30 –40 –50 DAC OUTPUT IMAGE –60 –70 –80 – FREQUENCY (MHz) ...

Page 14

LT6604-2.5 TYPICAL APPLICATIONS Dual, Matched 5th Order, 2.5MHz Lowpass Filter, Gain = 1 Frequency Response 10 0 –10 –20 –30 –40 –50 –60 –70 –80 –90 100k 1M FREQUENCY (Hz 0.1μ 787Ω 787Ω ...

Page 15

PACKAGE DESCRIPTION 4.50 ± 0.05 3.10 ± 0.05 1.50 REF 4.00 ± 0.10 PIN 1 TOP MARK (NOTE 6) 7.00 ± 0.10 NOTE: 1. DRAWING IS NOT A JEDEC PACKAGE OUTLINE 2. DRAWING NOT TO SCALE 3. ALL DIMENSIONS ARE ...

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 ...

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