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LTC6603IUF#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24
LTC6603
22
6603fa
APPLICATIONS INFORMATION
the LTC6603 for the lowest cutoff frequency (LPF1 = 0,
LFP0 = 0) reduces the supply current by about 60%. Power
supply current vs. cutoff frequency for various bandwidth
settings is shown in the Typical Performance Characteris-
ticst section. The LTC6603 can be programmed through
the serial interface to enter into a low power shutdown
mode. The power supply current during shutdown is less
than 235µA.
Supply Current vs Noise Trade-Off
The passband of the LTC6603 is determined by the master
clock frequency (which is set by R
BIAS
when the internal
oscillator is used), LPF1 and LPF0. The LTC6603 is op-
timized for use with R
BIAS
having a value between 200k
and 30.9k to set the internal oscillation frequency from
12.36MHz to 80MHz. The lowpass corner frequency is
proportional to the clock frequency (internal or external).
Figure 14. f
CLK
vs Filter Cutoff Frequencies Figure 15. Supply Current vs Filter Cutoff Frequency
Table 7. Total Input Referred Integrated Noise Voltage (Passband Gain = 24dB)
LPF1 LPF0 NOISE VOLTAGE
0 0 –81dBm
0 1 –80dBm
1 X –76dBm
To extend the fi lter’s operational frequency range, the
master clock is divided down before reaching the fi lter.
LPF1 and LPF0 set the division ratio of the lowpass clock.
Figure 14 shows the possible cutoff frequencies versus
f
CLK
, LPF1 and LPF0. Overlapping frequency ranges allow
more than one possible choice of bandwidth settings for
some cutoff frequencies. Figure 15 shows supply current
as a function of the fi lter cutoff frequency, LPF1 and LPF0.
Note that the higher bandwidth setting always gives the
minimum supply current for a given cutoff frequency. The
input referred integrated noise voltage for a passband
gain of 24dB is shown in Table 7. Note that the noise is
higher for the higher bandwidth settings. This creates a
tradeoff between supply current and noise. For a given
cutoff frequency, using the highest possible bandwidth
setting gives the minimum supply current at the expense
of higher noise.
FILTER CUTOFF FREQUENCY (Hz)
f
CLK
(MHz)
6603 F14
100
10
10k 1M 10M100k
LPF1 = 1
LPF1 = 0
LPF0 = 1
LPF1 = 0
LPF0 = 0
FILTER CUTOFF FREQUENCY (Hz)
SUPPLY CURRENT (mA)
6603 F15
180
160
140
120
100
80
60
40
20
0
10k 1M 10M100k
LPF1 = 1
LPF1 = 0
LPF0 = 1
LPF1 = 0
LPF0 = 0
T
A
= 25°C
V
S
= 3V
CLKCNTL PIN FLOATING
GAIN = 0dB
LTC6603
23
6603fa
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
TYPICAL APPLICATIONS
UF Package
24-Lead Plastic QFN (4mm × 4mm)
(Reference LTC DWG # 05-08-1697)
LTC6603 Parallel Clock Control
LTC6603 SPI Clock Control
4.00 ± 0.10
(4 SIDES)
NOTE:
1. DRAWING PROPOSED TO BE MADE A JEDEC PACKAGE OUTLINE MO-220 VARIATION (WGGD-X)—TO BE APPROVED
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE, IF PRESENT
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION
ON THE TOP AND BOTTOM OF PACKAGE
PIN 1
TOP MARK
(NOTE 6)
0.40 ± 0.10
2423
1
2
BOTTOM VIEW—EXPOSED PAD
2.45 ± 0.10
(4-SIDES)
0.75 ± 0.05
R = 0.115
TYP
0.25 ± 0.05
0.50 BSC
0.200 REF
0.00 – 0.05
(UF24) QFN 0105
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
0.70 ±0.05
0.25 ±0.05
0.50 BSC
2.45 ± 0.05
(4 SIDES)
3.10 ± 0.05
4.50 ± 0.05
PACKAGE
OUTLINE
PIN 1 NOTCH
R = 0.20 TYP OR
0.35 × 45° CHAMFER
6603 TA02
+INA
V+
IN
V+
A
V+
D
–INA
+INB
–INB
CAP
GAIN1
GAIN0(D0)
GND
GND
R
BIAS
V
OCM
+OUTA
–OUTA
+OUTB
–OUTB
CLKCNTL
SDO
SDI
LPF0(SCLK)
LPF1(CS)
CLKIO
SER
LTC6603
0.
1
3V
1216
3V
0.1µF
0.1µF
24
23
20
22
21
25
14
7
8
4
3
19
18
5
11
10
6
9
13
12
15
17
R3 R1
V
OCM
R2
DIODES INC
DMN2004DWK
CLK1
CLK1 CLK0
0 0 R
BIAS1
f
CLK1
0 1 R
BIAS2
f
CLK2
1 0 R
BIAS3
f
CLK3
1 1 R
BIAS4
f
CLK4
R
BIAS1
> R
BIAS2
OR R
BIAS3
R
BIAS
=
R
BIAS
IN k
f
CLK
in MHz
R1 = R
BIAS1
R2 = R3 = R
BIAS4
=
CLK0
LPF1
LPF0
GAIN1
GAIN0
2472
f
CLK
DESIGN PROCEDURE
1. CHOOSE f
CLK1
, f
CLK2
AND f
CLK3
2. CALCULATE R
BIAS1
, R
BIAS2
AND R
BIAS3
3. CALCULATE R2, R3 AND R
BIAS4
R
BIAS1
• R
BIAS2
R
BIAS1
– R
BIAS2
R
BIAS1
• R
BIAS3
R
BIAS1
– R
BIAS3
R1 • R2 • R3
R1 • (R2 + R3) + R2 • R3
6603 TA03
+INA
V+
IN
V+
A
V+
D
–INA
+INB
–INB
CAP
GAIN1
GAIN0(D0)
GND
GND
R
BIAS
V
OCM
+OUTA
–OUTA
+OUTB
–OUTB
CLKCNTL
SDO
SDI
LPF0(SCLK)
LPF1(CS)
CLKIO
SER
LTC6603
0.1µF
3V
1216
3V
0.1µF
0.1µF
24
23
20
22
21
25
14
7
8
4
3
19
18
5
11
10
6
9
13
12
15
17
CS
SCLK
SDI
V
OUT
GND
V+
0.1µF
3V
4
5
6
3
2
1
R1
V
B
V
C
R2
CS1 CS2SCK SDI
LTC2630
8-BIT DAC
IF R1 = 51.1k and R2 = 78.7k THEN
THE f
CLK
RANGE IS 12.36MHz to 80MHz
DAC V
OUT
RANGE 0V TO 2.5V
(USING THE LTC2630 INTERNAL REFERENCE)
R1 =
V
C
RANGE 0V to 2.5V, V
B
= 1.17V
IF V
C
= 0V THEN f
CLK
= f
CLKHI
IF V
C
= 2.5V THEN f
CLK
= f
CLKLO
5.282 • 10
12
1.137f
CLKHI
+ f
CLKLO
, R2 =
5.282 • 10
12
f
CLKHI
– f
CLKLO
f
CLK
= 2.472 • 10
12
R1+ R2
R1• R2
V
C
V
B
•R2
PACKAGE DESCRIPTION
LTC6603
24
6603fa
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2008
LT 0709 REV A • PRINTED IN USA
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CUTOFF
=1.92MHz (UTMS WCDMA)
6603 TA04
+INA
V+
IN
V+
A
V+
D
–INA
+INB
–INB
CAP
GAIN1
GAIN0(D0)
GND
GND
R
BIAS
V
OCM
+OUTA
–OUTA
+OUTB
–OUTB
CLKCNTL
SDO
SDI
LPFO(SCLK)
LPF1(CS)
CLKIO
SER
LTC6603
0.1µF 0.1µF
100pF
10pF
10pF
100pF
10pF
10pF
49.9Ω
56nH*
49.9Ω
56nH*
49.9Ω
56nH*
49.9Ω
56nH*
5V 3V
1216
3V
3V
0.1µF
0.1µF
24
23
20
22
21
25
14
7
8
4
3
19
18
5
11
10
6
9
13
12
15
17
40.2k
BASEBAND
GAIN CONTROL
I
OUT
Q
OUT
LTC5575
EN
V
CC
V
CC
V
CC
I
OUT
+
I
OUT
–
Q
OUT
+
Q
OUT
–
GND GND GNDRF
GND LO V
CC
GND
10pF
10pF
10pF
100pF
10pF
10pF
56nH*
56nH*
*COILCRAFT 0603HP
10pF
100pF
56nH*
56nH*
RF IN
LO IN
1000pF0.1µF1µF
5V
4321
9101112
5
6
7
8
16
15
14
13
1000pF
GAIN1 GAIN0
3.9pF
5.6pF
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24

LTC6603IUF#PBF

Mfr. #:
Buy LTC6603IUF#PBF
Manufacturer:
Analog Devices Inc.
Description:
Active Filter Dual Programmable 2.5MHz Filter for Communications
Lifecycle:
New from this manufacturer.
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