Zetex ZXF103Q16TA, ZXF103Q16TC Datasheet

ZXF103

VARIABLE Q FILTER

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: -

Sonar and Ultrasonic Systems

•

Line frequency notch

•

Signalling

•

Motion detection

•

Instrumentation

•

Low frequency telemetry

•

ORDERING INFORMATION

PART NUMBER PACKAGE PART

ZXF103Q16 QSOP16 ZXF103

MARK

SYSTEM DIAGRAM

C C

R R

Filter Input Filter Output

ZXF103

R

Q SET

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

•

PART NUMBER CONTAINER INCREMENT
ZXF103Q16TA Reel 7”

178mm

ZXF103Q16TC Reel 13”

330mm

500

2500

PINOUT

116

R2
0V
RC2
BIAS
RC1
0V
C1
FI1

GP1
Vcc

GP3
GP2
NC
Vcc

FO
FI2

ISSUE 1 - APRIL 2002

1

ZXF103

ABSOLUTE MAXIMUM RATINGS

Voltage on any pin 7.0V (relative to 0V)
Operating temperature range 0 to 70°C
Storage temperature -55 to 125°C

ELECTRICAL CHARACTERISTICS

Test Coνditions: Temperature =25°C, V

R

=10k,CL=10pF

L

GENERAL CHARACTERISTICS
Parameter Conditions Min. Typical Max. Units

Operating current 4.0 5.0 mA
Max. operating frequency Vout=1.6V p-p

Q usable range 0.5 50
Centre Frequency temperature

coefficient
Q temperature coefficient Q=30, fo = 1kHz 0.1 % /°C
Voltage noise 1 – 100 kHz 20
Input impedance 10 15 20
Linear Output Range
Sink current 450
Source current 450

Vout=1.0V p-p

Q=30, fo = 1kHz 100 ppm/°C

Output load =10 kΩ

= 5.00V, 0V =0.00V,

CC

2 V pk-pk

600
1000

kHz

nV/√ Hz
kΩ

µA
µA

Histogram of Centre Frequency

(Fo = 11.80KHz Q = 25)

Number of Devices

11.78 11.79 11.80 11.81 11.82

Frequency (KHz)

Pin Name Function

1 R2 Phase retard node

2 0V 0 Volts

3 RC2 Phase retard node

4 BIAS Internal bias generator

5 RC1 Phase advance node

6 0V 0 Volts

7 C1 Phase advance node

8 FI1 Filter input mode dependent

9 FI2 Filter input, mode dependent

10 FO Filter output for all modes

11 Vcc +5 Volt supply

12 N/C No connection

13 GP2 Loop gain node

14 GP3 Loop gain node

15 Vcc +5 Volt supply

16 GP1 Loop gain node

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2

Filter Configurations and Responses
Notch Filter

ZXF103

AC Filter Performance

0

-8

-16

-24

Gain (dB)

-32

-40
10K 100K 1M 10M

270

225

180

135

Phase (deg)

90

Frequency (Hz)

1

Fo

=

2RC

π

where R=R1=R2
and C=C1=C2

R4

Q

∝

R3

where R1,R2,R3 and R4 艌2kΩ
and C1 and C2 艌 50pF

See “Designing for a value of Q”
for more details.

45

10K 100K 1M

ISSUE 1 - APRIL 2002

10M

Frequency (Hz)

3