Features
n
A/D conversion with 6-bit
resolution
n
Time base programmable
from 50ns to 3.27 ms (at
a clock frequency of 20
MHz)
n
Trigger Modes: Auto, In-
ternal +/-, External +/-
n
5 discrete trigger levels
n
Internal SRAM for 128
values
n
SRAM bypass mode
n
Shift of base line by ad-
justable offset
n
Supply voltage 5 Volts
n
Bidirectional 碌C interface
n
Power-down for analog
part
n
PLCC44 package
Application
The Graphic Signal Monitor IC
was developed for visualization
of the time behavior of electri-
cal signals. Interaction with an
external 碌C makes it possible
to achieve the functionality of a
one-channel digital storage
oscilloscope with additional
digital voltmeter function.
The small dimensions as well
as a minimum of external wi-
ring facilitate both the applica-
tion in miniaturized measuring
devices for service and test
area, and placement near the
front panels in control panels
and switch cabinets.
Description
After the parameters of time
basis, trigger level and trigger
mode have been loaded into
the control register, the recor-
ding starts as soon as the trig-
ger condition occurs. This
procedure ends when 128
times 6 bit data have been
written from the flash A/D con-
verter into the internal SRAM.
Afterwards, an externally con-
nected microcontroller can
read the data and formate it for
an LC display or for transmis-
sion via an interface.
Block Diagram
SRAM
ADC
A_IN
Z_IN
A
+
-
uC Interface
D
MUX
REFT
REFB
REF
PARITY
DIO_0..7
OUT_10
OUT_100
SEL_AC
SEL_DC
STATUS
TRIGGER
TIME BASE
CONTROL
LD-DISPL
EN_REC
EXT_PWR
BP_RAM
CPUCLK
WR_TEST
T_IN
TRIG_OUT
TRIG_IN
SHIFT REG
DISP_DATA
DISP_CLK
1
1
2
3
4
