MAX271EWG(2012) 查看數據表（PDF） - Maxim Integrated

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MAX271EWG
(Rev.:2012)

Digitally-Programmed, Dual 2nd-Order Continuous Lowpass Filter

Maxim Integrated 

MAX270/MAX271

Digitally-Programmed, Dual

2nd-Order Continuous Lowpass Filter

Pin Description (continued)

MAX271

PIN NAME FUNCTION, FP MODE (MODE = GND OR V-)

FUNCTION, FP MODE (MODE = GND OR V+)

1 T/H OUT Track-and-Hold Output

2

V+

Positive Supply Voltage

3

OUTA Filler A Signal Output

4

SHDN —

SHUTDOWN Control. A low level disconnects outputs

and places device into shutdown mode

5

INA Filter A Signal Input

6

V-

Negative Supply Voltage

7

INB Filter B Signal Input

8

MODE Selects FP mode when connected to GND or V- and pin-strap mode when connected to V+.

9

OUTB Filter B Signal Output

10

GND Ground

11 T/H A/B —

Track-and-Hold Input Control. A high/low level internally

connects OUTNOUTB to input of Track-and-Hold

WRITE Control Input. A low level writes data

12

WR

D0-D6 program memory addressed by A1, A0

—

(or performs function as described for address

inputs). High level latches data.

13

T/H EN X

Track-and-Hold Output Control. Low level disconnects

T/H OUT. Connect pin high for normal operation

14

CS

Chip Select Input. Must be low for WR input to

—

be recognized.

Address and FP Control Inputs.

0, 0 Programs fC, filter A

0, 1 Programs fC, filter B

1,0 Controls T/H functions:

15, 16

A1, A0

D0 performs T/H En pin function

D1 performs T/H A/B pin function.

—

1,1 Controls device shutdown:

D0 performs SHDN pin function

Note: The WR pin must be strobed low to initiate

a program/function (Figure 2).

17-23

24

D0–D6

T/H

7-bit Data Inputs. Allows programming of

128 cutoff frequencies (also performs control

functions as described above).

7-bit Data Inputs. Program memory latches are trans-

parent in this mode. Connect pins high or low to

program filters A and B simultaneously to the same fC.

Track-and-Hold Control. Low level causes T/H OUT to track selected filter output. Filter output level held at

T/H OUT synchronous with T/H rising transition.

X = Pin has no function in this mode.

Note: All digital input levels are TTL and CMOS compatible, unless otherwise noted.

Maxim Integrated

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