MAX136CMH+T [MAXIM]
A/D Converter, 1 Func, CMOS, PQFP44;
| 型号： | MAX136CMH+T |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | A/D Converter, 1 Func, CMOS, PQFP44 转换器 |
| 文件： | 总5页 (文件大小：521K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MAX136
1
Low Power, 3 ⁄2 Digit A/D Converter
with Display Hold
General Description
Features
The MAX136 is a monolithic analog-to-digital converter
(ADC) with very high input impedance. It differs from the
Maxim ICL7136 in that the MAX136 provides a Hold pin,
which makes it possible to hold or "freeze" a reading. The
MAX136 directly drives a nonmultiplexed liquid crystal
(LCD) display, requiring no external drive circuitry. With
minor external component changes, it is pin compatible
with the ICL7116 but with significantly reduced power
consumption, making the MAX136 a superior device for
portable systems.
•ꢀ PowerꢀDissipationꢀGuaranteedꢀLessꢀthanꢀ1mW–9Vꢀ
BatteryꢀLifeꢀ3000ꢀHoursꢀTypical
•ꢀ HoldꢀPinꢀAllowsꢀIndefiniteꢀDisplayꢀHold
•ꢀ GuaranteedꢀFirstꢀReadingꢀRecoveryꢀfromꢀ
Overrange
•ꢀ On-BoardꢀDisplayꢀDriveꢀCapability—NoꢀExternalꢀ
CircuitryꢀRequired
•ꢀ High-ImpedanceꢀCMOSꢀDifferentialꢀInputs
•ꢀ LowꢀNoise(<ꢀ15µV )ꢀWithoutꢀHysteresisꢀorꢀ
P-P
Versatility and accuracy are inherent features of this
ADC. The dual-slope conversion technique automatically
rejects interference signals common in industrial envi-
ronments. True differential inputs allow direct measure-
ments of bridge transducer outputs or load cells. The
zero-integrator phase eliminates overrange hangover
and hysteresis effects. The MAX136 offers high accuracy
by lowering rollover error to less than one count and zero
reading drift to less than 1µV/°C.
OverrangeꢀHangover
•ꢀ ClockꢀandꢀReferenceꢀOn-Chip
•ꢀ ZeroꢀInputꢀGivesꢀZeroꢀReading
•ꢀ TrueꢀPolarityꢀIndicationꢀforꢀPrecisionꢀNullꢀ
Applications
•ꢀ KeyꢀParametersꢀGuaranteedꢀOverꢀTemperature
Ordering Information
Applications
PART
MAX136CPL+
MAX136CMH+
MAX136CQH+
MAX136C/D
TEMPꢀRANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
PIN-PACKAGE
40 PDIP
These devices can be used in a wide range of digital
panel meter applications. Most applications, however,
involve the measurement and display of analog data:
44 MQFP
44 PLCC
Dice
Pressure
Voltage
Resistance
Temperature
Conductance
Current
Speed
+Denotes a lead(Pb)-free/RoHS-compliant package.
Material Thickness
Pin Configurations
Typical Operating Circuit
LCD DISPLAY
ANALOG
INPUT
MAX136
9V
V
REF
TO ANALOG
COMMON (P32)
Pin Configurations continued at end of data sheet
(Detailed Circuit Diagram—See 3rd page)
For pricing, delivery, and ordering information, please contact Maxim Direct at
1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
19-0890; Rev 1; 11/12
MAX136
1
Low Power, 3 ⁄2 Digit A/D Converter
with Display Hold
ABSOLUTEꢀMAXIMUMꢀRATINGS
Supply Voltage (V+ to V-) .....................................................15V
Analog Input Voltage (either input) (Note 1)..................V+ to V-
Reference Input Voltage (either input)...........................V+ to V-
Clock Input, Hold Input.............................................TEST to V+
Power Dissipation (Note 2)
PDIP.............................................................................800mW
Operating Temperature Range............................. 0°C to +70°C
Storage Temperature ....................................... -65°C to +160°C
Lead Temperature (soldering, 60s) ................................+300°C
Noteꢀ1: Input voltages may exceed the supply voltages, provided the input current is limited to 1mA.
Noteꢀ2: Dissipation rating assumes device is mounted with all leads soldered to printed circuit board.
2
Maxim Integrated
MAX136
1
Low Power, 3 ⁄2 Digit A/D Converter
with Display Hold
are not updated; when the Hold input is low or at the
Test voltage, the display is updated at the end of each
Detailed Description
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).
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
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
0.47µF
34
33
34
33
LCD DISPLAY
LCD DISPLAY
+
-
+
-
C
REF C REF
2-19
C
REF
C
REF
2-19
22-25
SEGMENT
DRIVE
SEGMENT
DRIVE
1MI
22-25
1MI
31
31
20
IN HI
20
IN HI
PDL
BP
TEST
BACKPLANE
DRIVE
PDL
BP
TEST
BACKPLANE
DRIVE
ANALOG
INPUT
21 MINUS SIGN
ANALOG
INPUT
21 MINUS SIGN
0.01µF
0.01µF
37
37
30
32
30
32
RUN
IN LO
RUN
IN LO
1
1
HOLD
HOLD
COMMON
BUFF
COMMON
BUFF
HOLD
35
HOLD
35
+
28
+
28
V
V
180kI
150kI
180kI
150kI
MAX136
MAX136
0.47µF
0.47µF
29
29
9V
9V
A/Z
INT
A/Z
INT
V
REF
V
REF
0.047µF
36
0.047µF
36
27
27
100kI
REF HI
100kI
REF HI
26
26
-
-
V
V
OSC OSC OSC
2
3
1
OSC OSC OSC
2
3
1
C
OSC
TO ANALOG
COMMON (P32)
39
38
40
C
TO ANALOG
COMMON (P32)
39
38
40
OSC
R
OSC
R
OSC
50pF
50pF
180kI
180kI
Figure 2. MAX136 Typical Operating Circuit, 2.0V Full Scale
Figure 1. MAX136 Typical Operating Circuit, 200mV Full Scale
Maxim Integrated
3
MAX136
1
Low Power, 3 ⁄2 Digit A/D Converter
with Display Hold
Pin Configurations (continued)
TOP VIEW
43
42 41 40
6
5
4
3
2
1
44
+
V
F1
G1
E1
7
8
9
39
N.C.
N.C.
1
2
3
4
5
6
7
8
9
33 N.C.
32 G2(TENS)
31 C3
+
38 C REF
-
37 C REF
TEST
OSC3
N.C.
D2 10
C2 11
N.C. 12
B2 13
A2 14
F2 15
E2 16
D3 17
36 COMMON
35 IN HI
34 N.C.
30 A3
29 G3
MAX136
MAX136
OSC2
OSC1
HOLD
D1
28 BP
27 POL(-)
26 AB4
25 E3
33 IN LO
32 A/Z
31 BUFF
C1 10
B1 11
24 F3
30 INT
23 B3
−
V
29
18 19 20 21 22 23 24 25 26 27 28
PLCC
MQFP
Package Information
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a
“+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the
drawing pertains to the package regardless of RoHS status.
PARTꢀTYPE
40 PDIP
PACKAGEꢀCODE
P40+1
DOCUMENTꢀNO.
21-0044
LANDꢀPATTERNꢀNo.
—
44 PLCC
44 MQFP
Q44+1
21-0049
90-0236
90-0169
M44+5
21-0826
4
Maxim Integrated
MAX136
1
Low Power, 3 ⁄2 Digit A/D Converter
with Display Hold
Revision History
REVISION
NUMBER
REVISIONꢀ
DATE
PAGESꢀ
DESCRIPTION
CHANGED
0
1
2/87
Initial release
—
11/12
Add MQFP package to Ordering Information and Package Information.
1, 4
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent
licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and
max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated 160 Rio Robles, San Jose, CA 95134 USA 1-408-601-1000
5
©
2012 Maxim Integrated Products, Inc.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
相关型号：
MAX1377ATP+
ADC, Successive Approximation, 12-Bit, 1 Func, 2 Channel, Serial Access, BICMOS, ROHS COMPLIANT, TQFN-20
MAXIM
MAX1377ATP+T
D/A Converter, 12-Bit, 1 Func, 2 Channel, Serial Access, BICMOS, ROHS COMPLIANT, TQFN-20
MAXIM
©2020 ICPDF网 联系我们和版权申明