Datasheet

LTC6602
16
6602fc
APPLICATIONS INFORMATION
Gain and Group Delay vs Frequency
(45kHz to 300kHz Bandpass Response)
Gain and Group Delay vs Frequency
(15kHz to 150kHz Bandpass Response)
Gain and Group Delay vs Frequency
(90kHz to 900kHz Bandpass Response)
Gain and Group Delay vs Frequency
(900kHz Lowpass Response)
are shown in Table 3. When the LTC6602 is programmed
for the lowest lowpass cutoff frequency (LPF1, LPF0 = ‘0’),
the power is automatically reduced by about 35%.
Table 2. Cutoff Frequency Control, R
BIAS
= 54.9k, f
CLK
= 90MHz
LPF1 LPF0
LOWPASS
BW (kHz) HPF1 HPF0
HIGHPASS
BW (kHz)
0 0 150 0 0 15
0 1 300 0 1 45
1 0 900 1 0 90
1 1 900 1 1 Bypass HPF
Table 3. Cutoff Frequency Control, R
BIAS
= 200k, f
CLK
= 24.705MHz
LPF1 LPF0
LOWPASS
BW (kHz) HPF1 HPF0
HIGHPASS
BW (kHz)
0 0 41.175 0 0 4.1175
0 1 82.35 0 1 12.3525
1 0 247.05 1 0 24.705
1 1 247.05 1 1 Bypass HPF
The following graphs show a few of the possible combina-
tions of highpass and lowpass filters.
FREQUENCY (Hz)
GAIN (dB)
GROUP DELAY (µs)
6602 G28
40
10
20
30
0
–60
–50
–40
–30
–20
–10
20
14
16
18
12
0
2
4
6
8
10
1k 1M 10M100k10k
T
A
= 25°C
V
S
= 3V
EXTERNAL
CLOCK
R
BIAS
= 54.9k
GAIN = 30dB
GROUP
DELAY
GAIN = 24dB
GAIN = 0dB
GAIN = 12dB
FREQUENCY (Hz)
GAIN (dB)
GROUP DELAY (µs)
6602 G29
40
10
20
30
0
–60
–50
–40
–30
–20
–10
60
42
48
54
36
0
6
12
18
24
30
1k 1M100k10k
T
A
= 25°C
V
S
= 3V
EXTERNAL
CLOCK
R
BIAS
= 54.9k
GAIN = 30dB
GROUP
DELAY
GAIN = 24dB
GAIN = 0dB
GAIN = 12dB
FREQUENCY (Hz)
GAIN (dB)
GROUP DELAY (µs)
6602 G30
40
10
20
30
0
–60
–50
–40
–30
–20
–10
10
7
8
9
6
0
1
2
3
4
5
10k 10M1M100k
T
A
= 25°C
V
S
= 3V
EXTERNAL
CLOCK
R
BIAS
= 54.9k
GAIN = 30dB
GAIN = 24dB
GAIN = 12dB
GAIN = 0dB
GROUP
DELAY
FREQUENCY (Hz)
GAIN (dB)
GROUP DELAY (µs)
6602 G28
40
10
20
30
0
–60
–50
–40
–30
–20
–10
1.0
0.7
0.8
0.9
0.6
0.0
0.1
0.2
0.3
0.4
0.5
1k 1M 10M100k10k
T
A
= 25°C
V
S
= 3V
EXTERNAL CLOCK
R
BIAS
= 54.9k
GAIN = 30dB
GROUP DELAY
GAIN = 24dB
GAIN = 0dB
GAIN = 12dB