R858L8D80-4 datasheet(2/19 Pages) FREQUENCYDEVICES

Part #	R858L8D80-4

Description	2" x 4" Range Switch 8-Pole Filters

Download	19 Pages

Scroll/Zoom	100%

Manufacturer	FREQUENCYDEVICES [Frequency Devices, Inc.]

Direct Link	http://www.freqdev.com/

Logo

2 / 19 page

Range Switch

8-Bit Programmable Filters

R858 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

Digital Tuning Characteristics

The digital tuning interface circuits are two 4042 quad CMOS

latches which accept the following CMOS-compatible inputs:

eight tuning bits (D0 - D7), arrange selection bit (R), a latch

strobe bit (C), and a transition polarity bit (P).

Filter tuning follows the tuning equation given below:

fc = ( fmax/256 ) [ 1 + D7 x 2

7

+ D6 x 2

6

+ D5 x 2

5

+ D4 x 2

4

+ D3 x

2

3

+ D2 x 2

2

+ D1 x 2

1

+ D0 x 2

0

]

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

Data Control Lines

Functions

Latch Strobe (C)

Transition Polarity (P)

Data Control Modes

Mode 1

P = 0; C = 0 frequency follows input codes

P = 0; C = 0

› frequency latched on rising edge

Mode 2

P = 1; C = 1 frequency follows input codes

P = 1; C = 1

ﬂ frequency latched on falling edge

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.

Latch Response

Data Set Up Time1

25 nS

Data Hold Time2

50 nS

Strobe Pulse Width

80 nS min.

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

MSB

---

LSB

Bit

Weight

2

7

2

6

2

5

2

4

2

3

2

1

2

0

fc

Corner

Frequency

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

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

“P”

Transition Polarity Bit

D4 Tuning Bit 4

“C”

Tuning Strobe Bit

D3 Tuning Bit 3

+Vs

Supply Voltage, Positive

D2 Tuning Bit 2

-Vs

Supply Voltage, Negative

D1 Tuning Bit 1

Os

Offset Adjustment

D0 Tuning Bit 0 (LSB)

R

Range Switch Adjustment

Notes:

1. Frequency data must be present before occurrence of strobe edge.

2. Frequency data must be present after occurrence of strobe edge.

2.00

OUT

-Vs

+Vs

R

IN Os4

C

P

Bottom View

D7

D6

D5

D4

GND

D3

D2

D1

D0

Similar Part No. - R858L8D80-4

Manufacturer	Part #	Datasheet	Description
Frequency Devices, Inc.	R858	544Kb / 13P	Differential Input 4-Pole Filters

More results

R858L8D80-4 Datasheet(PDF) 2 Page - Frequency Devices, Inc.

R858L8D80-4 Datasheet(HTML) 2 Page - Frequency Devices, Inc.

Similar Part No. - R858L8D80-4

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

Datasheet Download

Link URL