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D824H8B 数据表(PDF) 2 Page - Frequency Devices, Inc.

部件名 D824H8B
功能描述  2" x 2" Differential Input 4-Pole Filters
Download  13 Pages
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制造商  FREQUENCYDEVICES [Frequency Devices, Inc.]
网页  http://www.freqdev.com/
标志 FREQUENCYDEVICES - Frequency Devices, Inc.

D824H8B 数据表(HTML) 2 Page - Frequency Devices, Inc.

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8-Bit Programmable Filters
D824 Series
Digital Tuning &
Control Characteristics
1784 Chessie Lane, Ottawa, IL 61350 • Tel: 800/252-7074, 815/434-7800 • FAX: 815/434-8176
e-mail: sales@freqdev.com • Web Address: http://www.freqdev.com
2
MSB
---
---
---
---
---
---
LSB
27
26
25
24
23
22
21
20
D7
D6
D5
D4
D3
D2
D1
D0
00000000
fmax/256
00000001
fmax/128
00000011
fmax/64
00000111
fmax/32
00001111
fmax/16
00011111
fmax/8
00111111
fmax/4
01111111
fmax/2
11111111
fmax
Bit
Weight
fc
Corner
Frequency
+Vs
OUT
-Vs
D
D
D
D
GND
D
D
D
D
-IN
2.00
Bottom View
Os
4
5
3
2
1
0
6
7
4
+IN
Pin-Out Key
IN
Analog Input Signal
D7 Tuning Bit 7 (MSB)
OUT Analog Output Signal
D6 Tuning Bit 6
GND Power and Signal Return
D5 Tuning Bit 5
+Vs
Supply Voltage, Positive
D4 Tuning Bit 4
-Vs
Supply Voltage, Negative
D3 Tuning Bit 3
Os
Offset Adjustment
D2 Tuning Bit 2
D1 Tuning Bit 1
D0 Tuning Bit 0 (LSB)
Digital Tuning Characteristics
The digital tuning interface circuits are a parallel set of eight (8)
4053 CMOS switches which accept CMOS compatible inputs
for the eight tuning bits (D0 - D7).
Filter tuning follows the tuning equation given below:
fc = ( fmax/256 ) [ 1 + D7 x 27 + D6 x 26 + D5 x 25 + D4 x 24 + D3
x 23 + D2 x 22 + D1 x 21 + D0 x 20 ]
where D1 - D7 = "0" or "1", and
fmax = Maximum tuning frequency;
fc = corner frequency;
Minimum tunable frequency = fmax/256 (D0 thru D7 = 0);
Minimum frequency step (Resolution) = fmax/256
Data Input Specifications
Input Data Levels
(CMOS Logic)
Input Voltage (Vs = 15 Vdc)
Low Level In
0 Vdc min.
4 Vdc max.
High Level In
11 Vdc min.
15 Vdc max.
Input Current
High Level In
- 10 -5
mA typ. -1 mA max..
Low Level In
+10 -5
mA typ. +1 mA max.
Input Capacitance
5 pF typ
7.5 pF max.
Input Data Format
Frequency Select Bits
Positive Logic
Logic "1" = +Vs
Logic "0" = Gnd
Bit Weighting
(Binary-Coded)
D0
LSB (least significant bit)
D7
MSB (most significant bit)
Frequency Range
256 : 1, Binary Weighted


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