ZXF103
VARIABLE Q FILTER
ZXF103Q16, ZXF103EV
DESCRIPTION
The ZXF103 is a versatile analog high Q bandpass filter. It can be configured to provide pass or notch
characteristics.
The basic filter section requires 2 resistors and 2 capacitors to set the centre frequency. The frequency range is up
to 600kHz. Two external resistors control filter Q Factor. The Q can be varied up to 50.
APPLICATIONS
Many filter applications including: -
FEATURES AND BENEFITS
•
Centre Frequency up to 1MHz
•
Variable Q
up to 50
•
Low distortion
•
Low noise
•
Low power 25mW
•
Devices easily cascaded
•
Small QSOP16 package
•
Sonar and Ultrasonic Systems
•
Line frequency notch
•
Signalling
•
Motion detection
•
Instrumentation
•
Low frequency telemetry
ORDERING INFORMATION
PART NUMBER
ZXF103Q16
PACKAGE
QSOP16
PART MARK
ZXF103
PART NUMBER
ZXF103Q16TA
ZXF103Q16TC
CONTAINER
Reel 7”
178mm
Reel 13”
330mm
INCREMENT
500
2500
SYSTEM DIAGRAM
PINOUT
1
16
R2
0V
RC2
BIAS
RC1
0V
C1
FI1
GP1
Vcc
GP3
GP2
NC
Vcc
FO
FI2
R
C
R
C
Filter Input
ZXF103
Filter Output
R
Q SET
ISSUE 2 - JULY 2002
1
ZXF103
ABSOLUTE MAXIMUM RATINGS
Voltage on any pin
Operating temperature range
Storage temperature
R
L
=10k,C
L
=10pF
GENERAL CHARACTERISTICS
Parameter
Operating current
Max. operating frequency
Q usable range
Centre Frequency temperature
coefficient
Q temperature coefficient
Voltage noise
Input impedance
Linear Output Range
Sink current
Source current
Output impedance
Pin
1
2
3
Name
R2
0V
RC2
BIAS
RC1
0V
C1
FI1
FI2
FO
Vcc
N/C
GP2
GP3
Vcc
GP1
Output load
=10
kΩ
Q=30,
Q=30,
fo = 1kHz
fo = 1kHz
Vout=1.6V p-p
Vout=1.0V p-p
0.5
100
0.1
20
10
15
2
450
450
10
Function
Phase retard node
0 Volts
Phase retard node
Internal bias generator
Phase advance node
0 Volts
Phase advance node
Filter input mode dependent
Filter input, mode dependent
Filter output for all modes
+5 Volt supply
No connection
Loop gain node
Loop gain node
+5 Volt supply
Loop gain node
20
Conditions
Min.
Typical
4.0
Max.
5.0
600
1000
50
ppm/°C
% /°C
nV/√ Hz
kΩ
V pk-pk
µA
µA
Units
mA
kHz
7.0V (relative to 0V)
0 to 70°C
-55 to 125°C
ELECTRICAL CHARACTERISTICS
Test Conditions: Temperature =25°C, V
CC
= 5.00V, 0V =0.00V,
1 – 100 kHz
Histogram of Centre Frequency
(Fo = 11.80KHz Q = 25)
4
5
6
7
8
Number of Devices
9
10
11
12
11.78
11.79
11.80
11.81
11.82
13
14
15
16
Frequency (KHz)
ISSUE 2 - JULY 2002
2
ZXF103
Filter Configurations and Responses
Notch Filter
AC Filter Performance
0
-8
Fo
=
1
2
π
RC
Gain (dB)
-16
where R=R1=R2
and C=C1=C2
Q
∝
R4
R3
2kΩ
-24
-32
where R1,R2,R3 and R4
and C1 and C2 50pF
100K
1M
10M
-40
10K
Frequency (Hz)
270
See “Designing for a value of Q”
for more details.
225
Phase (deg)
180
135
90
45
10K
100K
1M
10M
Frequency (Hz)
ISSUE 2 - JULY 2002
3
ZXF103
Filter Configurations and Responses (Continued)
Inverse Notch Filter (with 0dB Stop Band)
AC Filter Performance
30
24
Fo
=
1
2
π
RC
Gain (dB)
18
where R=R1=R2
and C=C1=C2
Q
∝
R4
R3
2kΩ
12
6
where R1,R2,R3 and R4
and C1 and C2 50pF
100K
0
10K
Frequency (Hz)
1M
10M
-45
-90
-135
-180
-225
-270
10K
100K
1M
10M
Frequency (Hz)
ISSUE 2 - JULY 2002
4
ZXF103
Filter Configurations and Responses (Continued)
Inverse Notch Filter (with attenuating skirts)
AC Filter Performance
1
2
π
RC
Fo
=
where R=R1=R2
and C=C1=C2
Q
∝
R4
R3
2kΩ
where R1,R2,R3 and R4
and C1 and C2 50pF
See “Designing for a value of Q”
for more details.
The skirt ‘roll off’ away from the
peak is -20dB/Decade regardless
of chosen Q.
Typical responses from the circuit
with component values derived
from the diagram.
ISSUE 2 - JULY 2002
5
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