MAX136 데이터 시트보기 (PDF) - Maxim Integrated
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MAX136 Datasheet PDF : 5 Pages
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MAX136
Low Power, 31⁄2 Digit A/D Converter
with Display Hold
Detailed Description
The MAX136 3½ digit ADC is similar to the Maxim
ICL7136 except for the addition of a Hold pin. For a
detailed product description, and applications informa-
tion (other than the operation of the Hold pin described
below), refer to Maxim's ICL7136 data sheet.
Hold Input
The Hold input is a digital input with a logic thresh-
old approximately midway between V+ and Test. The
MAX136 continuously performs conversions, indepen-
dent of the Hold input. When the Hold input is at V+ the
display latch pulse is inhibited, and the display latches
are not updated; when the Hold input is low or at the
Test voltage, the display is updated at the end of each
conversion. The MAX136 maintains low-power dissipa-
tion even during display hold by eliminating the pulldown
resistor between Hold and Test present on the ICL7116.
The Hold input is CMOS compatible, and can also be
driven by a switch connected between Test and V+
(Figure 1).
Reference Input
Unlike the ICL7136, the MAX136 does not have a refer-
ence low input. Apply the reference voltage between
Reference High (REF HI) and
0.47µF
1MI
ANALOG
INPUT
0.01µF
34
33
C+ REF C- REF
LCD DISPLAY
2-19 SEGMENT
22-25 DRIVE
31 IN HI
PDL 20
BACKPLANE
BP 21 MINUS SIGN DRIVE
30 IN LO
32
COMMON
28 BUFF
TEST 37
HOLD 1
V+ 35
RUN
HOLD
180kI
0.047µF
0.47µF
MAX136
150kI
29 A/Z
27 INT
VREF
REF HI 36
V- 26
OSC2 OSC3 OSC1
39 38 COSC 40
9V
100kI
TO ANALOG
COMMON (P32)
ROSC
50pF
180kI
Figure 1. MAX136 Typical Operating Circuit, 200mV Full Scale
0.47µF
1MI
ANALOG
INPUT
0.01µF
34
33
C+ REF C- REF
LCD DISPLAY
2-19 SEGMENT
22-25 DRIVE
31 IN HI
PDL 20
BACKPLANE
BP 21 MINUS SIGN DRIVE
30 IN LO
32
COMMON
28 BUFF
TEST 37
HOLD 1
V+ 35
RUN
HOLD
180kI
0.047µF
0.47µF
MAX136
150kI
29 A/Z
27 INT
VREF
REF HI 36
V- 26
OSC2 OSC3 OSC1
39 38 COSC 40
9V
100kI
TO ANALOG
COMMON (P32)
ROSC
50pF
180kI
Figure 2. MAX136 Typical Operating Circuit, 2.0V Full Scale
Maxim Integrated
3
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