LTC1066-1_15 Datasheet, PDF (4/20 Pages) Linear Technology – 14-Bit DC Accurate Clock-Tunable, 8th Order Elliptic or Linear Phase Lowpass Filter

LTC1066-1
TYPICAL PERFOR A CE CHARACTERISTICS
Gain vs Frequency
V_S = ±7.5V, f_CLK/ f_C = 50:1
10
0
f_CLK= 5MHz
–10
–20
f_CLK= 500kHz
–30
–40
–50
–60
–70
–80
–90
–100
V_S = ±7.5V
T_A = 25°C
f_CLK/f_C = 50:1
COMPENSATION
= 30k, 15pF
–110
1k
10k
f_CLK= 2.5MHz
100k
1M
FREQUENCY (Hz)
1066-1 G01
Gain vs Frequency
V_S = ±7.5V, f_CLK/ f_C = 100:1
10
0
–10
–20
f_CLK= 1MHz
–30
f_CLK= 5MHz
–40
–50
–60
–70
–80
–90
–100
V_S = ±7.5V
T_A = 25°C
f_CLK/f_C = 100:1
NO COMPENSATION
PIN 8 TO AGND
–110
1k
10k
100k
1M
FREQUENCY (Hz)
1066-1 G02
Gain vs Frequency
V_S = ±7.5V, f_CLK/ f_C = 100:1
10
0
–10
–20
–30
f_CLK= 1MHz
f_CLK= 5MHz
–40
–50
–60
–70
–80
–90
–100
V_S = ±7.5V
T_A = 25°C
f_CLK/f_C =
PIN 8 TO
100:1
V^–
–110
1k
10k
100k
1M
FREQUENCY (Hz)
1066-1 G03
Passband Gain and Phase
vs Frequency
3
180
2
V_S = ±7.5V
T_A = 25°C
120
1
60
GAIN
0
0
–1
– 60
–2
– 120
PHASE
–3 _{ELLIPTIC RESPONSE}
–1 80
–4
f_C = 20kHz, f_CLK = 1MHz
f_CLK/f_C = 50:1, PIN 8 AT V
+
–5 ^RF ^{= 20k, C}F ^{= 1µF}
(SEE BLOCK DIAGRAM)
– 240
– 300
–6
– 360
2 4 6 8 10 12 14 16 18 20 22
FREQUENCY (kHz)
10666-1 G04
Passband Gain and Phase
vs Frequency
3
180
2
V_S = ±7.5V
T_A = 25°C
120
1
60
0
0
GAIN
–1
– 60
–2
PHASE
– 120
–3
–1 80
–4
LINEAR PHASE RESPONSE
f_C = 20kHz, f_CLK/f_C = 100:1
–5
PIN 8 AT GND, R_F = 20k, C_F = 1µF
(SEE BLOCK DIAGRAM)
– 240
– 300
–6
– 360
2 4 6 8 10 12 14 16 18 20 22
FREQUENCY (kHz)
10666-1 G05
Passband Gain and Phase
vs Frequency
3
180
2
V_S = ±7.5V
T_A = 25°C
120
1
60
0
GAIN
0
–1
– 60
–2
PHASE
–3
ELLIPTIC RESPONSE
–4
–5
f_C =
PIN
820AkTHVz,^–f,CR^{LKF /=fC}2=0k1,0C0_F^:1=
1µF
(SEE BLOCK DIAGRAM)
– 120
–1 80
– 240
– 300
–6
– 360
2 4 6 8 10 12 14 16 18 20 22
FREQUENCY (kHz)
10666-1 G06
Passband Gain vs Frequency
and f_CLK
3
2 _{A. fCLK = 1MHz (GND = 2.5V)}
1 ^{B. fCLK = 1.4MHz (GND = 2V)}
C. f_CLK = 1.8MHz (GND = 2V)
0
A
–1
BC
–2 _{VS = SINGLE 5V}
–3
T_A = 70°C
f_CLK/f_C = 50:1
–4
R_F = 20k, C_F = 1µF
RC COMPENSATION
–5 ^{= 15pF IN SERIES}
WITH 30kΩ
–6
1
10
FREQUENCY (kHz)
50
1066-1 G07
Passband Gain vs Frequency
and f_CLK
5
4
V_S = ±5V, T_A = 70°C
f_CLK/f_C = 50:1
3 RF = 20k, CF = 1µF
RC COMPENSATION
2 _{=15pF IN SERIES}
1 ^{WITH 30kΩ}
0
–1
–2
A. f_CLK = 1MHz
– 3 B. f_CLK = 2MHz
–4
C. f_CLK = 3MHz
D. f_CLK = 4MHz
A B CD
–5
1
10
100
FREQUENCY (kHz)
1066-1 G08
10661fa
4