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參數(shù)資料
| 型號(hào)： | LTC1066-1CS |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | 14-Bit DC Accurate Clock-Tunable, 8th Order Elliptic or Linear Phase Lowpass Filter |
| 中文描述： | SWITCHED CAPACITOR FILTER, ELLIPTIC/BESSEL, LOWPASS, PDSO18 |
| 封裝： | PLASTIC, SOL-18 |
| 文件頁數(shù)： | 8/16頁 |
| 文件大?。?/td> | 363K |
| 代理商： | LTC1066-1CS |
8
LTC1066-1
15pF capacitor should be connected between pins 11 and
13. Compensation is recommended for the following
cases shown in Table 6.
Table 6. Cases Where an RC Compensation (15pF in Series with
30k
pins 11, 13) is Recommended, f
CLK
/f
CUTOFF
= 50:1
V
S
= Single 5V (AGND = 2V)
T
A
= 25
°
C
T
A
= 70
°
C
V
S
=
±
5V
T
A
= 25
°
C
T
A
= 70
°
C
V
S
=
±
7.5V
T
A
= 25
°
C
T
A
= 70
°
C
f
CUTOFF
≥
28kHz
f
CUTOFF
≥
24kHz
f
CUTOFF
≥
60kHz
f
CUTOFF
≥
50kHz
f
CUTOFF
≥
70kHz
f
CUTOFF
≥
60kHz
Connect Pins (6, 12)
Pin 6 (CONNECT 1) and pin 12 (CONNECT 2) should be
shorted. In a printed circuit board the connection should
be done under the IC package through a short trace
surrounded by the analog ground plane. Pin 6 should be
0.2 inches away from any other circuit trace.
PI
FU
CTIO
N
S
U
U
(see Block Diagram). Input bias current flows out of pins
2 and 3. Pin 16 (+IN B) is the positive input of a high
performance op amp B which is internally connected as
a unity-gain follower. Op amp B buffers the switched-
capacitor network output. The input capacitance of both
op amps is 10pF.
Pin 14 (FILTER
IN
) is the input of a switched-capacitor
network. The input impedance of pin 14 is typically 11k.
Output Pins (1, 7, 17)
Pins 1 and 17 are the outputs of the internal high perfor-
mance op amps A and B. Pin 1 is usually connected to the
internal switched-capacitor filter network input pin 14. Pin
17 is the buffered output of the filter and it can drive loads
as heavy as 200
(see THD + Noise curves under Typical
Performance Characteristics). Pin 7 is the internal switched-
capacitor network output and it can typically sink or
source 1mA.
Compensation Pins (11, 13)
Pins 11 and 13 are the AC compensation pins. If compen-
sation is needed, an external 30k resistor in series with a
BLOCK DIAGRA
M
W
FILTER
IN
CONNECT 1
6
COMP1
COMP2
CONNECT 2
FILTER
OUT
8TH ORDER
SWITCHED-
CAPACITOR
NETWORK
5,18
4,10
15
8
9
7
16
17
12
13
11
14
1
3
2
–IN A
+IN A
V
+
V
–
GND 50/100 CLK
+IN B
PATENT PENDING
LTC1066-1
OUT B
OUT A
C
F
R
F
11066-1 BD
–
HIGH SPEED
OP AMP
+
–
HIGH SPEED
OP AMP
+
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