Linear LTC6602 Manual de usuario

D E S C R IP T IO N

Demonstration Circuit 1304A features tw o programmable

filter ICs, the LTC660 dual, matched, bandpass filter and

the LTC6603, dual, matched, low pass filter.

The DC1304A

The DC1304AThe DC1304A

The DC1304A-

-A

A is for

is for is for

is for an LTC660 and

an LTC660 and an LTC660 and

an LTC660 and

The DC1304A

The DC1304AThe DC1304A

The DC1304A-

-B is for

B is forB is for

B is for an LTC6603.

an LTC6603. an LTC6603.

an LTC6603.

The LTC® 660 is a dual, programmable bandpass filter

and differential driver. The selectivity of the LTC660 is

ideal for filtering baseband tag signals in RFID systems.

The LTC® 6603 is a dual, programmable low pass filter for

communications receivers and transmitters in TD-SCDM A,

W CDM A, CDM A 000, UM TS and 80 .11x systems. A

DC1304A-A or ---B board has tw o pairs of SM A connectors

for differential inputs and tw o pairs of SM A connectors for

differential outputs. The differential inputs can be AC cou-

pled or DC coupled. O n board jumpers provide control of an

LTC660 or an LTC6603. The jumper control settings are:

serial or parallel control, internal or external clock, gain and

bandw idth control and input AC or DC coupling. An on

board multi-turn potentiometer sets the value of the R BIAS

resistor that sets the IC pow er supply current and clock

frequency. PCB turrets provide for board connections to an

SPI master for a serial control of IC gain and bandw idth.

LTC660 features:

LTC660 features:LTC660 features:

LTC660 features:

Guaranteed Phase and Gain M atching Specs

Programmable 5th Order Low pass: 40 kH z to 900 kHz

Programmable 4th Order Highpass: 4 kHz to 90 kH z

Programmable G ain (0dB/1 dB/ 4dB/30dB)

Simple Pin Programming or SPI Interface

Input R ange Extends from 0V to 5V

Low Voltage O peration: .7V to 3.6V

Shutdow n and M ute M ode

4mm × 4mm Q FN Package

LTC6603 features:

LTC6603 features:LTC6603 features:

LTC6603 features:

Guaranteed Phase and Gain M atching Specs

Programmable 9th Order Low pass: 4 kHz to .5 M Hz

Programmable G ain (0dB/6dB/1 dB/ 4dB)

Simple Pin Programming or SPI Interface

Input R ange Extends from 0V to 5V

Low Voltage O peration: .7V to 3.6V

Shutdow n M ode

4mm × 4mm Q FN Package

T h e L T C 6 6 0 2 B L O C K D IA G

T h e L T C 6 6 0 2 B L O C K D IA GT h e L T C 6 6 0 2 B L O C K D IA G

T h e L T C 6 6 0 2 B L O C K D IA G R

RA RA M

A RA MA RA M

A RA M

T h e L T C 6 6 0 3 B L O C K D IA

T h e L T C 6 6 0 3 B L O C K D IAT h e L T C 6 6 0 3 B L O C K D IA

T h e L T C 6 6 0 3 B L O C K D IA R

RG A RA M

G A RA MG A RA M

G A RA M

Design Files for this circuit are available.

Design Files for this circuit are available.Design Files for this circuit are available.

Design Files for this circuit are available.

Call the LTC factory.

Call the LTC factory.Call the LTC factory.

Call the LTC factory.

, LTC and LT are registered trademarks of Linear Technology Corporation.

L T C 6 6 0 2 / L T C 6 6 0 3

P RO G RA M A B L E B A N D P A S S / L O W P A S S F IL T E R

D E M O C IRC U IT

D E M O C IRC U IT D E M O C IRC U IT

D E M O C IRC U IT

1 3 0 4

1 3 0 41 3 0 4

1 3 0 4

Q U IC K S TA RT G

Q U IC K S TA RT GQ U IC K S TA RT G

Q U IC K S TA RT G

U ID E

U ID EU ID E

U ID E

DC1304 QUICK START GUIDE

Q U ICK TEST SETU P

Q U ICK TEST SETU PQ U ICK TEST SETU P

Q U ICK TEST SETU P

–

––

– PAR ALLEL CO N TR O L

PAR ALLEL CO NTR O L PAR ALLEL CO NTR O L

PAR ALLEL CO NTR O L

Q U IC K T E S T P R O C E D U R E

Test Proc

Test ProcTest Proc

Test Proce

edure

duredure

dure

Connect DC1304 as show n, turn on pow er and adjust

the R BIAS1 pot for 50M H z.

Connect 50 ohm terminator to AIN-(J ) and sinew ave

generator to AIN+ (J1).

Connect oscilloscope to VO UTA+ and on the oscillo-

scope display must show a 1Vp-p sinew ave.

Connect oscilloscope to VO UTA- and on the oscillo-

scope display must show a 1Vp-p sinew ave.



Connect 50 ohm terminator to BIN-(J ) and sinew ave

generator to BIN+ (J1).

Connect oscilloscope to VO UTB+ and on the oscillo-

scope display must show a 1Vp-p sinew ave.

Connect oscilloscope to VO UTB- and on the oscillo-

scope display must show a 1Vp-p sinew ave.

DC1304 QUICK START GUIDE

LTC660 FCLK AN D FCU TO FF R AN G E

LTC660 FCLK AN D FCU TO FF R AN G ELTC660 FCLK AN D FCU TO FF R AN G E

LTC660 FCLK AN D FCU TO FF R AN G E

FCLK R ange, 4M H z to 90M H z

FCLK R ange, 4M H z to 90M H zFCLK R ange, 4M H z to 90M H z

FCLK R ange, 4M H z to 90M H z

RBIAS = (4.941 10^9) / FCLK; RBIAS in k

Example: If FCLK = 50 M Hz Then

RBIAS = (4.941 10^9) / (50 10^6) = 98.8 k

The Low pass FCUTOFF = FCLK / NLP

The H ighpass FCUTOFF = FCLK / NHP

NLP and NH P are the clock dividers set by the

(LPF1, LPF0) and (HPF1, HPF0) inputs respectively.

LPF1 LPF0 NLP HPF1 HPF0 NHP

0 0 600 0 0 6000

0 1 300 0 1 000

1 0 100 1 0 1000

1 1 100 1 1 Bypass

HPF

Low pass Filter FCU TO FF

Low pass Filter FCU TO FFLow pass Filter FCU TO FF

Low pass Filter FCU TO FF R ange

R ange R ange

R ange

NLP Range

100 40kHz – 900kHz

300 80kH z – 300kHz

600 40kH z – 150kHz

H ighpass Filter FCU TO FF

H ighpass Filter FCU TO FFH ighpass Filter FCU TO FF

H ighpass Filter FCU TO FF Range

R ange R ange

R ange

NHP Range

1000 4kHz – 90kHz

000 1 kHz – 45kHz

6000 4kHz – 15kHz

LTC660 FCLK AN D FCU TO FF R AN G E

LTC660 FCLK AN D FCU TO FF R AN G ELTC660 FCLK AN D FCU TO FF R AN G E

LTC660 FCLK AN D FCU TO FF R AN G E

FCLK R ange, 1 M H z to 80M H z

FCLK R ange, 1 M H z to 80M H zFCLK R ange, 1 M H z to 80M H z

FCLK R ange, 1 M H z to 80M H z

RBIAS = ( .47 10^9) / FCLK; RBIAS in k

Example: If FCLK = 50 M H z Then

RBIAS = ( .47 10^9) / (50 10^6) = 49.44k

The Low pass FCUTOFF = FCLK / NLP

NLP clock divider set by the (LPF1, LPF0) inputs.

Low pass Filter

Low pass Filter Low pass Filter

Low pass Filter FCU TO FF R ange

FCU TO FF R angeFCU TO FF R ange

FCU TO FF R ange

NLP Range

3 375kHz – .5M Hz

1 8 93.75kHz – 6 5kH z

51 3.44kHz – 156. 5kHz

LPF1 LPF0 NLP

0 0 51

0 1 1 8

1 0 3

1 1 3

DC1304 QUICK START GUIDE

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DC1304A-A DC1304A-B

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