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LTC1564IG Datasheet

  • LTC1564IG

  • 10kHz to 150kHz Digitally Controlled Antialiasing Filter and...

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LTC1564
10kHz to 150kHz
Digitally Controlled
Antialiasing Filter and 4-Bit P.G.A
FEATURES
s
DESCRIPTIO
s
s
s
s
s
s
s
s
4-Bit Digitally Controlled 8th-Order Lowpass Filter
鈥?f
CUTOFF
Adjustable from 10kHz to 150kHz in 10kHz
Steps
鈥?100dB Attenuation at 2.5
脳
f
CUTOFF
4-Bit Digitally Controlled Programmable Gain
Amplifier
鈥?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
2.7V to 10V Operation
Low Noise Mute Mode
Low Power Shutdown Mode
The LTC
廬
1564 is a new type of continuous time filter for
antialiasing, reconstruction and other band-limiting appli-
cations. No other analog components or filter expertise are
needed to use it. There is one analog input pin and one
analog output pin. The cutoff frequency (f
C
) and gain are
programmable while the shape of the lowpass response is
fixed. A latching digital interface stores f
C
and gain settings
or it can be bypassed for control directly from the pins. The
LTC1564 operates from 2.7V to 10V total (single or split
supplies) and comes in a 16-pin surface mount SSOP.
The LTC1564 is a rail-to-rail high resolution 8th-order
lowpass filter with two stopband notches, giving approxi-
mately 100dB attenuation at 2.5 times the passband cutoff
frequency f
C
(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-
mum signal level to minimum noise) of 122dB (20 equiva-
lent bits) with 20kHz f
C
and 118dB at 100kHz f
C
on a
鹵5V
supply.
Other frequency-response shapes can be provided upon
request. Please contact LTC Marketing.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
s
s
s
s
s
s
s
s
s
s
Antialias or Reconstruction Filtering
DSP Systems
Communications Systems
Scientific Instruments
High Resolutions (16 Bits to 20 Bits)
Processing Signals Buried in Noise
Audio Signal Processing
Programmable Data Rates
Automatic Gain Control (AGC)
Single Part Replacing Multiple Filters
TYPICAL APPLICATIO
V
+
0.1碌F
ANALOG
IN
16
15
14
13
LTC1564 Programmable Range
30
20
10
0
鈥?0
鈥?0
鈥?0
鈥?0
鈥?0
鈥?0
f
C
= 10kHz
鈥?0
鈥?0 GAIN = 1V/V
鈥?0
鈥?00
鈥?10
鈥?20
10
5
f
C
= 150kHz
GAIN = 16V/V
Low Noise Programmable Filter with Variable Gain
GAIN CODE
12
11
G2
10
G1
9
G0
V
+
AND V
鈥?/div>
SUPPLIES CAN BE FROM
1.35V TO 5.25V EACH
TIE F AND G PINS TO V
+
OR V
鈥?/div>
TO
SET FREQUENCY AND GAIN
DYNAMIC RANGE 118dB TO 122dB
AT
鹵
5V DEPENDING ON FREQUENCY CODE
GAIN (dB)
IN AGND V
+
RST G3
LTC1564
OUT V
鈥?/div>
1
2
CS/
EN HOLD F3
3
4
5
F2
6
F1
7
F0
8
0.1碌F
ANALOG
OUT
V
鈥?/div>
FREQUENCY CODE
1564 TA01
U
100
FREQUENCY (kHz)
500
1564 TA02
U
U
1

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