LT1568CGN#PBF Linear Technology, LT1568CGN#PBF Datasheet

IC FILTER BUILDING BLOCK 16SSOP

LT1568CGN#PBF

Manufacturer Part Number
LT1568CGN#PBF
Description
IC FILTER BUILDING BLOCK 16SSOP
Manufacturer
Linear Technology
Datasheet

Specifications of LT1568CGN#PBF

Filter Type
Bandpass
Frequency - Cutoff Or Center
200kHz
Number Of Filters
2
Max-order
2nd
Voltage - Supply
2.7 V ~ 11 V, ±2.7 V ~ 5.5 V
Mounting Type
Surface Mount
Package / Case
16-SSOP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

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FEATURES
TYPICAL APPLICATIO
APPLICATIO S
Amplitude and Phase Matched Dual Butterworth 2.5MHz Lowpass
Replaces Discrete RC Active Filters and LC Filter
Modules
Antialiasing/Reconstruction Filters
Dual or I-and-Q Channels (Two Matched 2nd Order
Filters in One Package)
Single-Ended to Differential Conversion
Video Signal Processing
Up to 10MHz Center Frequency on a Single 3V
Supply
Easy to Use—A Single Resistor Value Sets Lowpass
Cutoff Frequency (200kHz
Resistor Values Extend Cutoff Frequency Up to
10MHz
Extremely Flexible—Different Resistor Values
Allow Lowpass Transfer Functions with or Without
Gain (Butterworth, Chebyshev or Custom)
SNR = 92dB (
THD = –84dB (
Internal Capacitors Trimmed to 0.75%
Single 4-Pole Lowpass Filter or Matched Pair of
2-Pole Lowpass Filters
Can be Connected as a Bandpass Filter
Single-Ended or Differential Output
Operates from Single 3V (2.7V Min) to 5V Supply
Rail-to-Rail Input and Output Voltages
Filter with Differential Output. Single 3V Supply Operation
V
V
OUTA
OUTA
V
INA
3V
511
C
511
511
C
0.1 F
U
= 2MHz, 2V
0.1 F
= 2MHz, 1V
1
2
3
4
5
6
7
8
V
INVA
SA
OUTA
OUTA
GNDA
NC
V
+
LT1568
GNDB
OUTB
OUTB
INVB
SB
EN
P-P
V
V
+
C
P-P
U
16
15
14
13
12
11
10
9
)
)
5MHz), Unequal
511
511
1568 TA01
511
THE PROPRIETARY ARCHITECTURE
ALLOWS FOR A SIMPLE RESISTOR
CALCULATION:
R = 128 •
V
V
V
INB
OUTB
OUTB
10MHz
C
;
C
= CUTOFF FREQUENCY
High Frequency Active RC,
DESCRIPTIO
The LT
block with rail-to-rail inputs and outputs. The internal ca-
pacitors of the IC and the GBW product of the internal low
noise op amps are trimmed such that consistent and repeat-
able filter responses can be achieved. With a single resis-
tor value, the LT1568 provides a pair of matched 2-pole
Butterworth lowpass filters with unity gain suitable for I/Q
channels.
By using unequal-valued external resistors, the two 2-pole
sections can create different frequency responses or
gains. In addition, the two stages may be cascaded to
create a single 4-pole filter with a programmable re-
sponse. Capable of cutoff frequencies up to 10MHz, the
LT1568 is ideal for antialiasing or channel filtering in high
speed data communications systems. The LT1568 can
also be used as a bandpass filter.
The LT1568 features very low noise, supporting signal-to-
noise ratios of over 90dB. It also provides single-ended to
differential signal conversion for directly driving high
speed A/D converters. The LT1568 has a shutdown mode
that reduces supply current to approximately 0.5mA on a
5V supply.
The LT1568 is available in a narrow 16-lead SSOP
package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
®
1568 is an easy-to-use, active-RC filter building
–12
–15
–18
–21
–24
–27
–6
–9
–3
3
0
100k
Filter Building Block
Amplitude Response
U
Very Low Noise,
FREQUENCY (Hz)
1M
1568 TA02
10M
LT1568
1
1568f

Related parts for LT1568CGN#PBF

LT1568CGN#PBF Summary of contents

Page 1

... A/D converters. The LT1568 has a shutdown mode that reduces supply current to approximately 0.5mA supply. The LT1568 is available in a narrow 16-lead SSOP package. , LTC and LT are registered trademarks of Linear Technology Corporation. 511 511 V INB V ...

Page 2

LT1568 ABSOLUTE AXI U RATI GS (Note 1) + – Total Supply Voltage ( ........................... 11.6V Input Voltage on INVA, INVB, GNDA and GNDB Pins ....................................................... V Input Current on INVA, INVB, GNDA and ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications and typical values are at T connected to midsupply R11 = R21 = R31 = R12 = R22 = R32, unless otherwise noted (see Block Diagram). FIL SYMBOL PARAMETER I Op Amp ...

Page 4

LT1568 FILTER ELECTRICAL CHARACTERISTICS Specifications are for the output (OUTA or OUTB single 2nd order section ( with respect to V gain = – R11 = R21 = R31 = R12 = R22 = ...

Page 5

FILTER ELECTRICAL CHARACTERISTICS Specifications are for the OUTA or OUTB of a single 2nd order section ( with respect R11 = R21 = R31 = R12 = R22 = R32, (see Block Diagram) The ...

Page 6

LT1568 FILTER ELECTRICAL CHARACTERISTICS Specifications are for the differential output (OUTA – OUTA or OUTB – OUTB single 2nd order section (A or B), gain = – R11 = R21 = R31 = R12 = R22 ...

Page 7

W U TYPICAL PERFOR A CE CHARACTERISTICS Supply Current vs Temperature –40 – TEMPERATURE ( C) 1568 ...

Page 8

LT1568 CTIO (Pins 1, 16): The V positive supply voltage pins should be tied together and bypassed with a 0.1 F capacitor to an adequate analog ground plane using the shortest ...

Page 9

CTIO S Dual Supply Power and Ground Connections ANALOG GROUND PLANE INVA INVB LT1568 4 OUTA OUTB 5 OUTA OUTB 6 GNDA GNDB ...

Page 10

LT1568 U U APPLICATIO S I FOR ATIO The LT1568 has been designed to make the implementa- tion of high frequency filtering functions very easy. Inter- nal low noise amplifiers and capacitors are configured in a topology that requires only ...

Page 11

U U APPLICATIO S I FOR ATIO The following filter examples are provided to make it easy to design a variety of filter stages. Both 2nd and 4th order filters are shown. For each filer, a table of external resistor ...

Page 12

LT1568 DUAL 2nd ORDER LOWPASS FILTER DESIG S Dual 2nd Order Lowpass Filter, Dual Supply Operation 5V 0 R11 R31 2 V INVA INVB IN1 3 LT1568 SA SB BAT54S R21 4 OUTA OUTB V ...

Page 13

DUAL 2nd ORDER LOWPASS FILTER DESIG S Table 2. Resistor Values in Ohms, Dual 2nd Order Lowpass Chebyshev, 0.25dB Passband Ripple, Gain = 1, R11 = R12, R21 = R22, R31 = R32 Amplitude Response 2nd Order Lowpass Chebyshev, 0.25dB ...

Page 14

LT1568 4th ORDER LOWPASS FILTER DESIG S 4th Order Lowpass Filter, Dual Supply Operation 5V 0 R11 R31 2 V INVA INVB IN 3 LT1568 SA SB R21 4 BAT54S OUTA OUTB 5 OUTA ...

Page 15

... FREQUENCY (MHz) 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 represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. U (MHz) R11, R21 ...

Page 16

... FREQUENCY (MHz) 1568 TA20 .009 (0.229 REF .150 – .157** .254 MIN (3.810 – 3.988) GN16 (SSOP) 0502 .0165 .0015 RECOMMENDED SOLDER PAD LAYOUT LT/TP 0403 2K • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 2003 .045 .005 .150 – .165 .0250 TYP 1568f ...

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