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參數(shù)資料
| 型號： | LTC1564IG#TR |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 9/12頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ANTIALIASING FILTER 16-SSOP |
| 標(biāo)準(zhǔn)包裝： | 2,000 |
| 濾波器類型： | 抗混迭 |
| 頻率 - 截止或中心： | 150kHz |
| 濾波器數(shù)： | 1 |
| 濾波器階數(shù)： | 8th |
| 電源電壓： | 2.7 V ~ 10.5 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SSOP（0.209"，5.30mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 16-SSOP |
| 包裝： | 帶卷 (TR) |
| 其它名稱： | LTC1564IGTR |
6
LTC1564
1564fa
UU
U
PI FU CTIO S
passes the bits directly when the CS/HOLD input is at logic
0. When CS/HOLD changes to logic 1, the F pins cease to
have effect and the latch holds the previous values. The F
code controls the filter’s cutoff frequency fC in 10kHz steps
up to 150kHz, as summarized in Table 1.
Table 1
F3
F2
F1
F0
NOMINAL FC
(AT OUTPUT OF INTERNAL LATCH)
(CUTOFF FREQUENCY)
0000
0 (Mute State: Filter Gain is Zero)
0001
10kHz
0010
20kHz
0011
30kHz
0100
40kHz
0101
50kHz
0110
60kHz
0111
70kHz
1000
80kHz
1001
90kHz
1010
100kHz
1011
110kHz
1100
120kHz
1101
130kHz
1110
140kHz
1111
150kHz
Thus fC is proportional to the binary value of the F code.
Note that small current sources pull F1 to V+ and F3, F2
and F0 to V– when these pins are left unconnected (see
Electrical Characteristics, Note 5). This sets an F code
input of 0010 (2, in decimal form) by default, giving an fC
of 20kHz in normal filtering operation, if CS/HOLD is logic
0 or is open circuited.
G0, G1, G2, G3 (Pins 9, 10, 11, 12): CMOS-Level Digital
Gain Control (“G Code”) Inputs. G3 is the most significant
bit (MSB). These pins program the LTC1564’s passband
gain through the internal latch, which passes the bits
directly when the CS/HOLD input is at logic 0. When
CS/HOLD changes to logic 1, the G pins cease to have
effect and the latch retains the previous input values. This
gain control is linear in amplitude: nominal passband gain
of the LTC1564 is the binary value of the G code, plus one
as shown in Table 2.
Note that small current sources pull the G pins to V – when
these pins are left unconnected (see Electrical Character-
istics, Note 5). This sets a G code input of 0000 by default,
giving unity passband gain in normal filtering operation, if
CS/HOLD is logic 0 or is open circuited.
RST (Pin 13): CMOS-Level Asynchronous Reset Input.
Logic 0 on this pin immediately resets the internal F and G
latch to all zeros, regardless of the state of the CS/HOLD
pin or the F or G input pins. This causes the LTC1564 to
enter a mute state (powered but with zero signal gain)
because of the resulting F = 0000 command. Logic 1
permits the other pins to control F and G. This pin floats to
logic 1 (V+) when open circuited because of a small
current source (see Electrical Characteristics, Note 5). A
brief internal reset (shorter than the analog settling time of
the filter) also occurs when power is first applied.
NOMINAL
G3
G2
G1
G0
PASSBAND GAIN
(VOLTS PEAK-TO-PEAK)
INPUT IMPEDANCE
(VOLT/VOLT) (dB)
DUAL 5V SINGLE 5V SINGLE 3V
(k
)
0000
1
0
10
5.0
3.0
10
0001
2
6.0
5
2.5
1.5
5
0010
3
9.5
3.33
1.67
1.0
3.33
0011
4
12
2.5
1.25
0.75
2.5
0100
5
14.0
2
1
0.6
2
0101
6
15.6
1.67
0.83
0.5
1.67
0110
7
16.9
1.43
0.71
0.43
1.43
0111
8
18.1
1.25
0.63
0.38
1.25
1000
9
19.1
1.1
0.56
0.33
1.11
1001
10
20.0
1.0
0.50
0.30
1
1010
11
20.8
0.91
0.45
0.27
0.91
1011
12
21.6
0.83
0.42
0.25
0.83
1100
13
22.3
0.77
0.38
0.23
0.77
1101
14
22.9
0.71
0.36
0.21
0.71
1110
15
23.5
0.67
0.33
0.20
0.66
1111
16
24.1
0.63
0.31
0.19
0.63
(AT OUTPUT OF INTERNAL LATCH)
MAXIMUM INPUT SIGNAL LEVEL
Table 2
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