Datasheet

TLC04/MF4A-50, TLC14/MF4A-100
BUTTERWORTH FOURTH-ORDER LOW-PASS
SWITCHED-CAPACITOR FILTERS
SLAS021A – NOVEMBER 1986 – REVISED MARCH 1995
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
functional block diagram
6
AGND
8
FILTER OUT
5
φ2φ1
Butterworth
Fourth-Order
Low-Pass Filter
Nonoverlapping
Clock Generator
2
CLKR
1
CLKIN
3
LS
Level Shift
FILTER IN
Terminal Functions
TERMINAL
I/O
DESCRIPTION
NAME NO.
I/O
DESCRIPTION
AGND 6 I Analog ground. The noninverting input to the operational amplifiers of the Butterworth fourth-order low-pass filter.
CLKIN 1 I Clock in. CLKIN is the clock input terminal for CMOS-compatible clock or self-clocking options. For either option,
LS is at V
CC–
. For self-clocking, a resistor is connected between CLKIN and CLKR and a capacitor is connected
from CLKIN to ground.
CLKR 2 I Clock R. CLKR is the clock input for a TTL-compatible clock. For a TTL clock, LS is connected to midsupply and
CLKIN can be left open, but it is recommended that it be connected to either V
CC+
or V
CC–
.
FILTER IN 8 I Filter input
FILTER OUT 5 O Butterworth fourth-order low-pass filter output
LS 3 I Level shift. LS accommodates the various input clocking options. For CMOS-compatible clocks or self-clocking,
LS is at V
CC–
and for TTL-compatible clocks, LS is at midsupply.
V
CC+
7 I Positive supply voltage terminal
V
CC–
4 I Negative supply voltage terminal