LTC1564
10kHz to 150kHz
Digitally Controlled
Antialiasing Filter and 4-Bit P.G.A.
U
FEATURES
DESCRIPTIO
The LTC®1564 is a new type of continuous time filter for
antialiasing,reconstructionandotherband-limitingappli-
cations.Nootheranalogcomponentsorfilterexpertiseare
needed to use it. There is one analog input pin and one
analog output pin. The cutoff frequency (fC) and gain are
programmablewhiletheshapeofthelowpassresponseis
fixed.AlatchingdigitalinterfacestoresfC andgainsettings
oritcanbebypassedforcontroldirectlyfromthepins.The
LTC1564 operates from 2.7V to 10V total (single or split
supplies) and comes in a 16-pin surface mount SSOP.
■
4-Bit Digitally Controlled 8th-Order Lowpass Filter
– fCUTOFF Adjustable from 10kHz to 150kHz in 10kHz
Steps
– 100dB Attenuation at 2.5 × fCUTOFF
■
4-Bit Digitally Controlled Programmable Gain
Amplifier
– G = 1 to 16 in 1V/V Steps
■
Miniature 16-Pin SSOP Package
■
No External Components
■
122dB Total System Dynamic Range
■
Rail-to-Rail Input and Output Range
The LTC1564 is a rail-to-rail high resolution 8th-order
lowpass filter with two stopband notches, giving approxi-
mately100dBattenuationat2.5timesthepassbandcutoff
frequency fC (a de-facto standard for DSP front ends).
Signals with low or variable levels can be normalized with
the built-in variable gain that reduces input-referred noise
with increasing gain for a typical dynamic range (maxi-
mumsignalleveltominimumnoise)of122dB(20equiva-
lent bits) with 20kHz fC and 118dB at 100kHz fC on a ±5V
supply.
■
2.7V to 10V Operation
Low Noise Mute Mode
■
■
Low Power Shutdown Mode
■
Available in 16-LUead Plastic SSOP Package
APPLICATIO S
■
Antialias or Reconstruction Filtering
■
DSP Systems
■
Communications Systems
■
Scientific Instruments
Other frequency-response shapes can be provided upon
request. Please contact LTC Marketing.
■
High Resolutions (16 Bits to 20 Bits)
■
Processing Signals Buried in Noise
■
Audio Signal Processing
Programmable Data Rates
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
■
■
Automatic Gain Control (AGC)
Single Part Replacing Multiple Filters
■
U
TYPICAL APPLICATIO
LTC1564 Programmable Range
Low Noise Programmable Filter with Variable Gain
30
20
10
0
+
V
f = 150kHz
C
GAIN = 16V/V
0.1µF
ANALOG
IN
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
GAIN CODE
16 15 14 13 12 11 10
+
9
+
–
V
AND V SUPPLIES CAN BE FROM
IN AGND
V
RST G3 G2 G1 G0
1.35V TO 5.25V EACH
TIE F AND G PINS TO V OR V TO
SET FREQUENCY AND GAIN
DYNAMIC RANGE 118dB TO 122dB
AT ± 5V DEPENDING ON FREQUENCY CODE
+
–
LTC1564
CS/
f
= 10kHz
C
–
OUT
1
V
V
EN HOLD F3 F2 F1 F0
GAIN = 1V/V
2
3
4
5
6
7
8
0.1µF
FREQUENCY CODE
ANALOG
OUT
5
10
100
500
1564 TA01
FREQUENCY (kHz)
–
1564 TA02
1564fa
1
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