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MAX135CPI+ |MAX135CPIMAXIMN/a24avai±15-Bit, Low-Power ADC with Parallel Interface
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MAX135CPI+-MAX135CWI+T-MAX135EPI+
±15-Bit, Low-Power ADC with Parallel Interface
9-4131;Rev, 0; 9/91
IEMIIM
115-13111L ADC with Parallel [Interface
General Description
The MAX135 is a CMOS 15-bit, binary-output analog-to-
digital converter (ADC). Multi-slope integration provides
low-noise and high-resolution conversions in less time
than standard integrating ADCs: The MAX135 is tested
at 16 conversions per second, but operates at up to 6
timesthat rate. The MAX135 uses Super LSBs with data
averaging to achieve 18-bit resolution.
Supply current is 125pA maximum during normal opera-
tion and only 10pA maximum in sleep mode. Low con-
version noise allows tested operation at only 300mV full
scale (15W per LSB). A simple 8-bit parallel data bus
and three control lines easily interface to all common
microprocessors, and twos-complement output coding
simplifies bipolar measurements.
High resolution and compact size make the MAX135
ideal for data loggers, numerical control systems, weigh
scales, data-acquisition systems, and panel meters. The
MAX135 comes in 28-pin DIP and SO packages in both
commercial and extended temperature grades.
Applications
Data Acquisition
Battery-Powered Instruments
Control Applications
Analog-Signal Measurement
Pressure, Flow, Temperature, Voltage,
Current, Resistance, Weight
Functional Diagram
Features
. 15-Bit, Multi-Slope Integrating ADC
t 15pV Resolution at 16 Conv/Sec
t Low Supply Current
- 125pA Max (Normal Operation)
" 10pA Max (Sleep-Mode Operation)
. :0.005% Accuracy at 16 Conv/Sec
. 3 Super Bits for 18-Bit Resolution
t Low Noise - Operates at 300mV Full Scale
. Easy pP Interface - 8-Bit Parallel Data Bus
t :10pA Input Leakage Current
. Small28-Pin DIP and SO Packages
Ordering Information
PART TEMP. RANGAE PIN-PACKAGE
MAX135CPI ty'C to +70°C 28 Plastic DIP
MAX135CWI 0°C to +70''C 28 Wide so
MAX135C/D 0°C to +70°C Dice'
MAX135EPI -40°C to +85''C 28 Plastic DIP
MAX135EWI -40°C to +85''C 28 Wide so
. Contact factory for dice specifications.
Pin Configuration
r--) f-, MN
CRU- CREF+ ll,
BUFOUT ---NVV-,
INT00T 1-ierrt
oo-or MAXIM INTIN
DATA MAX135 REF
REF- -
AGND T -
F---- "c-:; IN L0 -au"
RT) m HI 300mV INPUT
--- WR V- - -5V
---- DGND
EOCosm oscz Cl,
Lin----]
TOPVIEW
_S I . 28 ll,
ii5 Ei] BUFOUT
W'R Li] MAXIM El lNTOUT
OSC Lii MAX135 iii] INTIN
osm E] iii] CHEF-
DO E Ei CREF+
01 [ii] REF+
02 8 E] REF-
03 E] Tol AGND
D4 10 El INLO
05 [E Tii] AGND
D6 [E E] IN HI
07 " E] V-
DGND E EOC
DlP/SO
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9MM3COM
is a registered trademark of Maxim Integrated Products.
Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim's website at .
98' [¢wi
MAX fl 35
15-135 ADC with Parallel [Interface
ABSOLUTE MAXIMUM RATINGS
Supply Voltage
V+ to DGND ..................... -0.3V < V+ < +6.0V
V- to DGND ....................... +0.3V < V- < -9.0V
V+ to V- ...................................... +15V
Analog Input Voltage (any input) .................. V+ to V-
Digital Input Voltage ........... (DGND - 0.3V) to (V+ + 0.3V)
Continuous Power Dissipation (TA = +70°C)
28-Pin Mastic DIP (derate 9.09mWf C above +70''C) ...... 786mW
28-Pin Wide SO (derate 12.50mW/°C above +70''C) . 688mW
Operating Temperature Ranges:
MAX1350_ - .......................... 0'C to +70'C
MAX135E_ - .......................... -40°C to +85°C
Storage Temperature Range .............. -65°C to +160''C
Lead Temperature (soldering, 10 sec) 'PW.w.._.ttre. +300°C
Stresses beyond those listed under "Absolute Maximum Ratings' may cause permanent damage to thefievictr These are stress ratings only. and functional
operation of the device at these or any other conditions above those indicated in_lhe operational secttons ol the spetuTrcatitxs IS not implied, Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V+ = 5V. V- = AN, DGND = AGND = IN LO = REF- = OV, REF+ = 545rnV, RINT = 402m. CINT = 0.0047pF. CHEF = 0.1pF,
fCLK = 32,768Hz, 60Hz mode, TA = TMIN to TMAX, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Resolution (Note 1) 20,000 LSB
TA = +25''C "
Zero Error IN HI = 0V LSB
TA = TMIN to TMAX :5
Nonlinearity (Notes 2, 3) TA = +25°C " LSB
TA = +2S'C i3
Rollover Error (Note 4) LSB
TA = TMIN to TMAX :10
Conversion Time 63 ms
Input Voltage Range IN HI to IN LO ur300 mV
TA = +250 -+10
Leakage Current IN HI, IN LO pA
TA = TMIN to TMAX 1250
Common-Mode Rejection IN HI = IN LO VCM = :500mV 3 10 LSB
VCM = 13.5V 70
Common-Mode Range IN HI = IN LO :35 V
Read Zero (50Hz/60Hz Range) $2000 LSB
Noise (Zero-Reading Mode) IN HI = IN LO TA = +250 1.5 LSB
Zero-Reading Drift (Note 3) 0.1 LSB/" C
Scale Factor Temp. Coefficient (Note 3) 5 ppm/" C
Positive Supply Rejection FS change, V- -5.OV, +4.5V s: V+ s +5.5V 2 LSB
Negative Supply Rejection FS change, V+ = 5.0V. -4.5V s: V- s: -5.5V 2 LSB
Positive Supply Current " 60 125
Negative Supply Current I- -35 -65 HA
Digital Ground Supply Current -25 -60
Positive Sleep-Mode Current l+ 4 10
Negative Sleep-Mode Current I- -4 -10 u A
ggpgfround Sleep-Mode 0 "
2 xv: A x I All
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