Linear LTC6602 User manual

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
AA
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
RR
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
RR
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
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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
ee
edure
duredure
dure
1. 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).
3. Connect oscilloscope to VO UTA+ and on the oscillo-
scope display must show a 1Vp-p sinew ave.
4. Connect oscilloscope to VO UTA- and on the oscillo-
scope display must show a 1Vp-p sinew ave.
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5. Connect 50 ohm terminator to BIN-(J ) and sinew ave
generator to BIN+ (J1).
6. Connect oscilloscope to VO UTB+ and on the oscillo-
scope display must show a 1Vp-p sinew ave.
7. Connect oscilloscope to VO UTB- and on the oscillo-
scope display must show a 1Vp-p sinew ave.

DC1304 QUICK START GUIDE
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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

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