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XR-1007 Datasheet Preview

XR-1007 Datasheet

General Purpose Low Pass Filter

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XR·1 000·1 008
General Purpose Low Pass Filter
GENERAL DESCRIPTION
The XR-1000 is a general purpose 4th order low pass
filter utilizing switched capacitor (SCF) circuit tech-
niques. XR-1000 is available in several options provid-
ing Butterworth or Chebyshev filter responses. The
Chebyshev option is also available with passband ripple
specifications of 0.01, 0.1, or 1.0 dB specifications.
The SCF techniques used provide a clock tunable cut-
off frequency, with either 50:1 or 100:1 clock to cutoff
frequency ratios available. The clock may be externally
generated or an on-board Schmitt trigger is supplied for
providing an internal clock with an external resistor/
capacitor combination.
The XR-1000, utilizing CMOS technology, is available in
either a 14-Pin or 8-Pin DIL package.
FEATURES
Switched Capacitor Circuit Techniques
Single 5 Volt Operation
Low External Parts Count
No Precision Components Necessary
Low Power Operation
50:1/100:1 Clock to Cutoff Frequency Options
8-Pin/14-Pin Package Options
0.1 to 20 kHZ Cutoff Frequency Range
Internal/External Clock Operation
APPLlCATlDNS
General Purpose Low Pass Filters
Telecom Filtering
Medical Systems
Audio Applications
Data Acquisition Systems
FUNCTIONAL BLOCK DIAGRAMS
XR-1000
elK IN
elK R
l. SH
v-
4TH
ORDER
LOW
PASS
FILTER
FILTER IN
13 v+
12 AGND
FILTER OUT
NC
BRLO
FILTER
ESPONSE
lOGIC
NC
9 SO/100
8 NC
elK A
L. SH
v-
FILTER IN
AGND
FILTER OUT
ORDERING INFORMATION
Part Number
XR-1000CP/CN
XR-1001CP/CN
XR-1002CP/CN
XR-1003CP/CN
XR-1004CP/CN
XR-1005CP/CN
XR-100BCP/CN
XR-1007CP/CN
XR-1008CP/CN
Package
Plastic/Ceramic
Plastic/Ceramic
Plastic/Ceramic
Plastic/Ceramic
Plastic/Ceramic
Plastic/Ceramic
Plastic/Ceramic
Plastic/Ceramic
Plastic/Ceramic
Pins
14
8
8
8
8
8
8
8
8
Response/Ripple
BW-CH/-
BW/-
BW/-
CH/0.01 dB
CH/O.Q1 dB
CH/0.1 dB
CH/0.1 dB
CH/1.0 dB
CH/1.0 dB
1-71
fCLKllc
50/100
100
50
100
50
100
50
100
50
Operating Temperature Range
O°C to 70°C
O°C to 70°C
O°C to 70°C
O°C to 70°C
O°C to 70°C
O°C to 70°C
O°C to 70°C
O°C to 70°C
O°C to 70°C




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XR-1007 Datasheet Preview

XR-1007 Datasheet

General Purpose Low Pass Filter

No Preview Available !

XR·1000·1008
ABSOLUTE MAXIMUM RATINGS
Power Supply v+ + IV-I
Power Dissipation
14-Pin
B-Pin
Derate Above 2S·
14-Pin
B-Pin
Storage Temperature Range
14 Volts
7S0mW
SOOmW
6 mW/·C
2.S mW/·C
- 6S·C to + 1S0·C
PIN DESCRIPTIONS
Y+, Y- ,-The power supplies are applied to these
pins. The XR-l000 series will operate over a range of
SV to 14V with a single supply, or ± 2.SV to ± 7V for du-
al supplies.
Filter In-The raw signal, biased to mid-supply or capac-
ilively coupled, is applied to this pin.
.
Clock Input (CLK IN)-A dual purpose Schmitt trigger, ac-
cessed at this pin, aids system flexibility by allowing ei-
ther an external CMOS level clock or generation of an
internal clock signal (self clocking) with an external re-
sistor and capacitor. See ClK R for further information.
Clock Resistor (CLK R)-A TIL level clock may be applied
here. Alternately, a resistor connected between ClK R
and ClK IN and a capacitor from ClK IN to ground, al-
lows self clocking operation with the internal Schmitt
trigger.
Level Shift (L.SH)-The level shift pin provides clock se-
lection and switching thresholds. The voltage at L.SH
determines the threshold of the clock levei shift stage,
which converts either external TIL, external CMOS, or
the internally generated clock signal to full V+ to V-
excursions. Comparison threshold voltage level is two
volts above the voltage on L.SH. For TIL clocks, L.SH
should be held at power supply ground and dual sup-
plies of ± SV or greater must be employed. For CMOS
or internal clocking, connect L.SH to V - (or ground,
with single supplies). Forcing l.SH to V + disables the
filter.
Analog Ground (AGND)-The analog, or signal ground
should be directly connected to system power supply
ground for dual supply operation. This pin is internally
biased to (V+ + V-)/2, and should be heavily by-
passed with capacitors to power supply ground for sin-
gle supply operation. In noisy environments, perform-
ance may be improved with an additional bypass ca-
pacitor to V + .
Filter OUl-The filter output will typically source 3 mA
and sink 0.9 mA. With a SkI] or larger load reSistance,
the output will typically swing to within tV of either sup-
ply.
Frequency Ratio Select (50/100)-(XR-l000 only) The
clock to center frequency ratio is determined by this
pin. When tied to V+, the ratio is SO:I, when tied to
V-, 100:1 operation is selected.
Filter Response Select (RLO and RL1)-(XR-l000 only) The
desired filter response is selected by programming
these pins. logic 1 is V + , logic 0 is V - . Table 1 depicts
the programming necessary to select the various op-
tions available from the XR-l000.
Table 1_ XR-1000 Programming
RLO RL1 50/100 RESPONSE RIPPLE ICLK/lc
00
00
01
01
10
10
11
11
0 Butterworth X
SO:1
1 Butterworth X
100:1
0 Chebyshev 0.01 dB 50:1-
1 Chebyshev 0.01 dB 100:1
0 Chebyshev 0.1 dB SO:1
1 Chebyshev 0.1 dB 100:1
0 Chebyshev O.S dB SO:1
1 Chebyshev O.S dB 100:1
1-72


Part Number XR-1007
Description General Purpose Low Pass Filter
Maker Exar
Total Page 2 Pages
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