LTC1564 Datasheet PDF - Linear

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LTC1564
Linear

Part Number LTC1564
Description 10kHz to 150kHz Digitally Controlled Antialiasing Filter and 4-Bit P.G.A
Page 12 Pages


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LTC1564
10kHz to 150kHz
Digitally Controlled
Antialiasing Filter and 4-Bit P.G.A
FEATURES
s 4-Bit Digitally Controlled 8th-Order Lowpass Filter
– fCUTOFF Adjustable from 10kHz to 150kHz in 10kHz
Steps
– 100dB Attenuation at 2.5 × fCUTOFF
s 4-Bit Digitally Controlled Programmable Gain
Amplifier
– G = 1 to 16 in 1V/V Steps
s Miniature 16-Pin SSOP Package
s No External Components
s 122dB Total System Dynamic Range
s Rail-to-Rail Input and Output Range
s 2.7V to 10V Operation
s Low Noise Mute Mode
s Low Power Shutdown Mode
U
APPLICATIO S
s Antialias or Reconstruction Filtering
s DSP Systems
s Communications Systems
s Scientific Instruments
s High Resolutions (16 Bits to 20 Bits)
s Processing Signals Buried in Noise
s Audio Signal Processing
s Programmable Data Rates
s Automatic Gain Control (AGC)
s Single Part Replacing Multiple Filters
DESCRIPTIO
The LTC®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 (fC) and gain are
programmable while the shape of the lowpass response is
fixed. A latching digital interface stores fC 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 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-
mum signal level to minimum noise) of 122dB (20 equiva-
lent bits) with 20kHz fC and 118dB at 100kHz fC on a ±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.
TYPICAL APPLICATIO
Low Noise Programmable Filter with Variable Gain
ANALOG
IN
V+
0.1µF
GAIN CODE
16 15 14 13 12 11 10 9
IN AGND V+ RST G3 G2 G1 G0
LTC1564
CS/
OUT VEN HOLD F3 F2 F1 F0
1 2 34 5 6 7 8
V+ AND VSUPPLIES CAN BE FROM
1.35V TO 5.25V EACH
TIE F AND G PINS TO V+ OR VTO
SET FREQUENCY AND GAIN
DYNAMIC RANGE 118dB TO 122dB
AT ± 5V DEPENDING ON FREQUENCY CODE
ANALOG
OUT
0.1µF
FREQUENCY CODE
V1564 TA01
LTC1564 Programmable Range
30
20
10
0
–10
–20
–30
–40
–50
–60
–70 fC = 10kHz
–80 GAIN = 1V/V
–90
–100
–110
–120
5
10
fC = 150kHz
GAIN = 16V/V
100
FREQUENCY (kHz)
500
1564 TA02
1
Free Datasheet http://www.datasheet4u.com/

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