LTC1164-6CS Linear Technology, LTC1164-6CS Datasheet

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LTC1164-6CS

Manufacturer Part Number
LTC1164-6CS
Description
Low Power 8th Order Pin Selectable Elliptic or Linear Phase Lowpass Filter
Manufacturer
Linear Technology
Datasheet

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FEATURE
A
TYPICAL
PPLICATI
8th Order Pin Selectable Elliptic or Bessel Filter in a
14-Pin Package
4mA Supply Current with 5V Supplies
64dB Attenuation at 1.44 f
f
110 V
Operates at Single 5V Supply with 1V
Input Range
Operates up to 8V Supplies
TTL/CMOS Compatible Clock Input
No External Components
Anti-Aliasing Filters
Battery-Operated Instruments
Telecommunication Filters
CUTOFF
WIDEBAND NOISE = 115 V
NOTE: THE CONNECTION FROM PIN 7 TO PIN 14 SHOULD BE MADE
UNDER THE PACKAGE. THE POWER SUPPLIES SHOULD BE BYPASSED
BY A 0.1 F CAPACITOR AS CLOSE TO THE PACKAGE AS POSSIBLE.
8V
RMS
up to 30kHz (50:1 f
V
NC
IN
Wideband Noise with 5V Supplies
10kHz Anti-Aliasing Elliptic Filter
A
S
PPLICATI
O
1
2
3
4
5
6
7
U
LTC1164-6
S
RMS
CUTOFF
CLK
14
13
12
11
10
O
9
8
U
to f
(Elliptic Response)
CUTOFF
1164-6 TA01
RMS
NC
–8V
CLK = 1MHz
V
–8V
OUT
Ratio)
Linear Phase Lowpass Filter
D
The LTC1164-6 is a monolithic 8th order elliptic lowpass
filter featuring clock-tunable cutoff frequency and low
power supply current. Low power operation is achieved
without compromising noise or distortion performance.
At 5V supplies the LTC1164-6 uses only 4mA supply
current while keeping wideband noise below 110 V
With a single 5V supply, the LTC1164-6 can provide up to
10kHz cutoff frequency and 80dB signal-to-noise ratio
while consuming only 2.5mA.
The LTC1164-6 provides an elliptic lowpass rolloff with
stopband attenuation of 64dB at 1.44 f
to-f
f
f
provides an elliptic lowpass filter with f
up to 20kHz. When pin 10 is connected to ground, the
LTC1164-6 approximates an 8th order linear phase re-
sponse with 65dB attenuation at 4.5 f
ratio of 160:1. The LTC1164-6 is pin compatible with the
LTC1064-1.
CUTOFF
CUTOFF
ESCRIPTIO
CUTOFF
Pin Selectable Elliptic or
can be clock-tuned up to 10kHz. For a f
ratio of 50:1 (pin 10 to V
ratio of 100:1 (pin 10 to V
–20
–30
–40
–50
–60
–70
–80
–10
Low Power 8th Order
0
1
U
Frequency Response
FREQUENCY (kHz)
10
). For a ratio of 100:1,
– 3dB
+
CUTOFF
LTC1164-6
CUTOFF
), the LTC1164-6
1164-6 TA02
and f
100
and an f
frequencies
CLK
CLK
/ f
RMS
– 3dB
CLK
1
-to-
-
.

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LTC1164-6CS Summary of contents

Page 1

... Ratio supplies the LTC1164-6 uses only 4mA supply CUTOFF current while keeping wideband noise below 110 V With a single 5V supply, the LTC1164-6 can provide up to RMS 10kHz cutoff frequency and 80dB signal-to-noise ratio while consuming only 2.5mA. The LTC1164-6 provides an elliptic lowpass rolloff with stopband attenuation of 64dB at 1 ...

Page 2

... CLK 50:1 CLK Single 5V, AGND = 2V S ORDER PART TOP VIEW NUMBER 16 CONNECT – LTC1164-6CS CLK 11 ELL/BESS OUT S PACKAGE = 110 C 4kHz at 100:1 and 8kHz at 50:1. CUTOFF MIN TYP MAX – 0.50 – 0.15 0.25 0.1 to – 0.3 – 0.45 – 0.10 0.10 – ...

Page 3

... 7.5V, T > may cause latch-up recommended that no sources operating from external supplies be applied prior to power-up of the LTC1164-6. Note 3: All gains are measured relative to passband gain. Note 4: The cutoff frequency of the filter is abbreviated – or less than V C HARA TERISTICS ...

Page 4

... LTC1164 TYPICAL PERFOR A Stopband Gain vs Frequency (Linear Phase Response ± CLK f = 5kHz – CLK –20 (PIN 10 AT GND 25°C A –30 –40 –50 –60 –70 –80 – FREQUENCY (kHz) Passband Gain vs Frequency 0.8 0.4 0 –0.4 –0 ± ...

Page 5

... CLK 100: 25°C – 50 CLK REPRESENTATIVE UNITS) –55 –60 –65 –70 –75 –80 –85 –90 0.5 1 FREQUENCY (kHz) LTC1164-6 Maximum Passband over Temperature T = 70° –40° SINGLE 50:1 CLK C GND = 2V WITH EXTERNAL RC LOWPASS FILTER (f = 40kHz) – ...

Page 6

... LTC1164 TYPICAL PERFOR A THD + Noise vs RMS Input (Elliptic Response) – 100:1 OR 50:1 CLK C – 1kHz 25° – 50 –55 – ±5V S –65 –70 –75 – ±7.5V S –85 –90 0.1 1 INPUT (V ) RMS 1164-6 G17 Transient Response 1ms/DIV V = 7.5V 100Hz SQUARE WAVE ...

Page 7

... When evaluating the device’s distortion an 6.5V output buffer is required. A noninverting buffer, Figure 3, 0.5V LTC1164-6 – provides an elliptic lowpass filter with ratio of 100:1. Pin 10 connected to CUTOFF ratio of 160:1 and a transient response – ...

Page 8

... Typical Performance Characteris- tics curve, Passband vs Frequency and f 50:1 When the LTC1164-6 operates with a single 5V supply and CLK CUTOFF its cutoff frequency is clock-tuned to 10kHz, an output single pole RC filter can also help maintain outstanding passband flatness from Table 2 shows details ...

Page 9

... LTC1164-6 operating with a 100kHz clock and 1kHz cutoff frequency receives a 98.5kHz, 10mV input signal, a 1.5kHz alias signal will appear at RMS its output. When the LTC1164-6 operates with a clock-to- cutoff frequency of 50:1, aliasing occurs at twice the clock frequency. Table 5 shows details Table 4 ...

Page 10

... PINS CAN BE GROUNDED OR LEFT FLOATING. 1164-6 TA06 – 8th Order Linear Phase Lowpass Filter ( 160:1 CLK LTC1164-6 f CLK NOTES: 1. TOTAL SUPPLY CURRENT I (EXCLUDING OUTPUT LOAD CURRENT). 2. FLAT PASSBAND UP TO 18kHz 20kHz. –3dB V OUT 3. THD + NOISE – ...

Page 11

... V 0.1 F – f CLK 1/2 – V LT1013 + 0.001 F 97.6k 16.9k 0.0047 1kHz C ATTENUATION AT 10kHz = –30dB LTC1164-6 11 IC2 7.89k 0.001 F THD + Noise vs Frequency V = SINGLE 5mA, 16TH ORDER ELLIPTIC LOWPASS V = 0.5V IN RMS f = 540kHz CLK f = 10kHz C ...

Page 12

... LTC1164-6 PACKAGE DESCRIPTIO 0.290 – 0.320 (7.366 – 8.128) 0.008 – 0.018 0° – 15° (0.203 – 0.460) 0.385 ± 0.025 0.038 – 0.068 (9.779 ± 0.635) (0.965 – 1.727) 0.300 – 0.325 (7.620 – 8.255) 0.015 (0.380) MIN 0.130 ± 0.005 (3.302 ± ...

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