DC1304A - Demo Manual

D E M O C IRC U IT 1 3 0 4
Q U IC K S TA RT G U ID E
LTC 6 6 0 2 / LTC 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 S C R IP T IO N
Demonstration Circuit 1304A features tw o programmable
filter ICs, the LTC6602 dual, matched, bandpass filter and
the LTC6603,dual,matched,low pass filter.
T h e L T C 6 6 0 2 B L O C K D IA G RA RA M
DC1304A-- A is for an LTC6602 and
The DC1304A
DC1304A-- B is for an LTC6603.
The DC1304A
The LTC® 6602 is a dual, programmable bandpass filter
and differential driver. The selectivity of the LTC6602 is
ideal for filtering baseband tag signals in R FID systems.
The LTC® 6603 is a dual, programmable low pass filter for
communications receivers and transmitters in TD-SCDM A,
W CDM A, CDM A2000, U M TS and 802.11x 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 coupled or DC coupled. O n board jumpers provide controlof an
LTC6602 or an LTC6603. The jumper control settings are:
serialor parallelcontrol, internalor externalclock, 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 serialcontrolof IC gain and bandw idth.
T h e L T C 6 6 0 3 B L O C K D IA RG A RA M
LTC6602 features:
G uaranteed Phase and G ain M atching Specs
Programmable 5th O rder Low pass:40 kH z to 900 kH z
Programmable 4th O rder H ighpass:4 kH z to 90 kH z
Programmable G ain (0dB/12dB/24dB/30dB)
Simple Pin Programming or SPI Interface
Input R ange Extends from 0V to 5V
Low Voltage O peration:2.7V to 3.6V
Shutdow n and M ute M ode
4mm × 4mm Q FN Package
LTC6603 features:
G uaranteed Phase and G ain M atching Specs
Programmable 9th O rder Low pass:24 kH z to 2.5 M H z
Programmable G ain (0dB/6dB/12dB/24dB)
Simple Pin Programming or SPI Interface
Input R ange Extends from 0V to 5V
Low Voltage O peration:2.7V to 3.6V
Shutdow n M ode
4mm × 4mm Q FN Package
Design Files for this circuit are available.
Callthe LTC factory.
,LTC and LT are registered trademarks ofLinear Technology Corporation.
DC1304 QUICK START GUIDE
Q U ICK TEST SETU P – PAR ALLEL CO N TR O L
Q U IC K T E S T P R O C E D U R E
Test Proce
Proce dure
1.
Connect DC1304 as show n,turn on pow er and adjust
the R BIAS1 pot for 50M H z.
2.
4.
6.
Connect oscilloscope to VO UTA- and on the oscillo-
Connect oscilloscope to VO UTB+ and on the oscilloscope display must show a 1Vp-p sinew ave.
Connect oscilloscope to VO UTA+ and on the oscilloscope display must show a 1Vp-p sinew ave.
Connect 50 ohm terminator to BIN-(J2) and sinew ave
generator to BIN + (J1).
Connect 50 ohm terminator to AIN-(J2) and sinew ave
generator to AIN + (J1).
3.
5.
7.
Connect oscilloscope to VO UTB- and on the oscilloscope display must show a 1Vp-p sinew ave.
scope display must show a 1Vp-p sinew ave.
2
DC1304 QUICK START GUIDE
LTC6602 FCLK AN D FCU TO FF R AN G E
LTC6602 FCLK AN D FCU TO FF R AN G E
FCLK R ange, 24M H z to 90M H z
FCLK R ange, 12M H z to 80M H z
RBIAS = (4.941 10^9) /FCLK;R BIAS in k
RBIAS = (2.472 10^9) /FCLK;R BIAS in k
Example:IfFCLK = 50 M H z Then
Example:IfFCLK = 50 M H z Then
RBIAS = (4.941 10^9) /(50 10^6) = 98.82k
RBIAS = (2.472 10^9) /(50 10^6) = 49.44k
The Low pass FCUTOFF = FCLK /N LP
The Low pass FCUTOFF = FCLK /N LP
The H ighpass FCU TO FF = FCLK /NH P
NLP clock divider set by the (LPF1,LPF0) inputs.
NLP and NH P are the clock dividers set by the
(LPF1,LPF0) and (H PF1,H PF0) inputs respectively.
LPF1 LPF0 NLP
HPF1 HPF0 NHP
0
0
600
0
0
6000
0
1
300
0
1
2000
1
0
100
1
0
1000
1
1
100
1
1
Bypass
HPF
LPF1 LPF0 NLP
0
0
512
0
1
128
1
0
32
1
1
32
Low pass Filter FCU TO FF R ange
NLP
Low pass Filter FCU TO FF R ange
Range
32
375kH z – 2.5M H z
NLP
Range
128
93.75kH z – 625kH z
100
240kH z – 900kH z
512
23.44kH z – 156.25kH z
300
80kH z – 300kH z
600
40kH z – 150kH z
H ighpass Filter FCU TO FF R ange
NHP
Range
1000 24kH z – 90kH z
2000 12kH z – 45kH z
6000 4kH z – 15kH z
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DC1304 QUICK START GUIDE
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DC1304 QUICK START GUIDE
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