Tfs321.doc

version 1.3

30.07.2001

Filter Specification

TFS 321

1/5

VI TELEFILTER

Vectron International Inc.

Potsdamer Straße 18

267 Lowell Road

Measurement condition

Ambient temperature:

23

°C

Input power level:

0 dBm

Terminating impedances

*

input:

490 Ohm // –1.6 pF

output:

490 Ohm // –1.6 pF

External coil:

175 nH

Characteristics

Remark:

Reference level for the relative attenuation arel of the TFS 321 is the minimum of the pass band attenuation amin. The minimum of the pass

band attenuation amin is defined as the insertion loss ae. The centre frequency fc is the arithmetic mean value of the upper and lower frequencies

at the 3 dB filter attenuation level relative to the insertion loss ae. The nominal frequency fN is fixed on 321,4 MHz without tolerance. The given

values for the relative attenuation arel and for the group delay ripple have to be reached at the frequencies given below also if the centre

frequency fc is shifted due to the temperature coefficient of frequency TCf in the operating temperature range and due to a production tolerance

for the centre frequency fc.

D a t a

typ. value

tolerance/limit

Insertion loss

ae = amin

-

max.

6,5

dB

(Reference level)

Nominal frequency

fN

-

321,400 MHz

Centre frequency

fC

321,41

Usable signal bandwidth

-

min.

140

kHz

3 dB bandwidth

BW

-

min.

280

kHz

Relative attenuation

arel

fN ± 400 kHz

-

min.

15

dB

fN ± 400 kHz ... fN ± 600 kHz

-

min.

27

dB

fN ± 600 kHz ... fN ± 13 MHz

-

min.

35

dB

Group delay ripple

GD

fN ± 70 kHz

-

max.

2

µs

Input power level

-

max.

13

dBm

Operating temperature range

-20

°C ... +70 °C

Temperature coefficient of frequency

TC

**

-0.036

ppm/K²

+ 20

°C

reference values only. Should there be additional questions do not hesitate to ask for an application note or contact our design team.

Generated:

Checked / approved:

D 14 513 TELTOW / Germany

Hudson, NH 03051 / USA

Tel: (+49) 3328 4784-0 / Fax: (+49) 3328 4784-30

Tel: (603) 598-0070 Fax: (603) 598-0075

E-Mail:

tft@telefilter.com

E-Mail:

vti@vtinh.com

VI TELEFILTER reserves the right to make changes to the product(s) and/or information contained herein without notice. No liability is

assumed as a result of their use or application. No rights under any patent accompany the sale of any such product(s) or information.