MAX132CWG+ Maxim Integrated Products, MAX132CWG+ Datasheet

IC ADC 18BIT W/SRL INTRFC 24SOIC

MAX132CWG+

Manufacturer Part Number
MAX132CWG+
Description
IC ADC 18BIT W/SRL INTRFC 24SOIC
Manufacturer
Maxim Integrated Products
Datasheet

Specifications of MAX132CWG+

Number Of Bits
18
Sampling Rate (per Second)
100
Data Interface
MICROWIRE™, Serial, SPI™
Number Of Converters
1
Voltage Supply Source
Dual ±
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
24-SOIC (0.300", 7.50mm Width)
Architecture
Dual Slope
Conversion Rate
0.1 KSPs
Input Type
Voltage
Interface Type
4-Wire (SPI, QSPI, MICROWIRE, TMS320)
Supply Voltage (max)
5 V
Maximum Power Dissipation
647 mW
Maximum Operating Temperature
+ 70 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
0 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX132 is a CMOS, 18-bit plus sign, serial-output,
analog-to-digital converter (ADC). Multi-slope integra-
tion provides high-resolution conversions in less time
than standard integrating ADCs, allowing operation up
to 100 conversions per second. Low conversion noise
provides guaranteed operation with ±512mV full-scale
input range (2µV/LSB). A simple 4-wire serial interface
connects easily to all common microprocessors, and
twos-complement output coding simplifies bipolar mea-
surements. Typical supply current is only 60µA and is
reduced to 1µA in sleep mode. Four serially pro-
grammed digital outputs can be used to control an
external multiplexer or programmable-gain amplifier.
The MAX132 comes in 24-pin narrow DIP and wide SO
packages, and is available in commercial and extend-
ed temperature grades.
High resolution, compact size, and low power make this
device ideal for data loggers, weigh scales, data-acqui-
sition systems, and panel meters.
________________________Applications
19-0009; Rev 2; 8/95
Call toll free 1-800-998-8800 for free samples or literature.
________________Functional Diagram
_______________General Description
Remote Data Acquisition
Battery-Powered Instruments
Industrial Process Control
Transducer-Signal Measurement
CS
SCLK
EOC
DIN
DOUT
P0
P1
P2
P3
Pressure, Flow, Temperature, Voltage
Current, Resistance, Weight
CREF-
OSC1
________________________________________________________________ Maxim Integrated Products
MAX132
CREF+
OSC2
BUF OUT
INT OUT
DGND
INT IN
AGND
REF+
IN LO
REF-
IN HI
V+
V-
±18-Bit ADC with Serial Interface
602k
4.7nF
+5V
-5V
±512mV INPUT
* Contact factory for dice specifications.
** Contact factory for availability and processing to MIL-STD-883.
____________________________Features
__________________Pin Configuration
______________Ordering Information
MAX132CNG
MAX132CWG
MAX132C/D
MAX132ENG
MAX132EWG
MAX132MRG
Low Supply Current:
±0.006% FSR Accuracy at 16 Conv/sec
Low Noise: 15µV
Serial I/O Interface with Programmed Output for
Mux and PGA
Performs up to 100 Conv/sec
±2pA Input Current
50Hz/60Hz Rejection
60µA (Normal Operation)
1µA (Sleep-Mode Operation)
TOP VIEW
PART
DGND
DOUT
OSC2
OSC1
SCLK
EOC
DIN
CS
P0
P1
P2
P3
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
10
11
12
1
2
3
4
5
6
7
8
9
RMS
MAX132
DIP/SO
24 Narrow Plastic DIP
24 Wide SO
Dice*
24 Narrow Plastic DIP
24 Wide SO
24 Narrow CERDIP**
PIN-PACKAGE
24
23
22
21
20
19
18
17
16
15
14
13
V+
BUF OUT
INT OUT
INT IN
CREF-
CREF+
REF-
AGND
IN LO
V-
REF+
IN HI
1

Related parts for MAX132CWG+

MAX132CWG+ Summary of contents

Page 1

... DGND P3 OSC1 OSC2 ________________________________________________________________ Maxim Integrated Products Call toll free 1-800-998-8800 for free samples or literature. ±18-Bit ADC with Serial Interface ____________________________Features Low Supply Current: 60µA (Normal Operation) 1µA (Sleep-Mode Operation) ±0.006% FSR Accuracy at 16 Conv/sec Low Noise: 15µV Serial I/O Interface with Programmed Output for ...

Page 2

ADC with Serial Interface ABSOLUTE MAXIMUM RATINGS Supply Voltage V+ to DGND ..............................................-0.3V < V+ < +6. DGND ................................................+0.3V < V- < -9. ............................................................................+15V Analog Input Voltage (any input)..................................... Digital Input Voltage ...

Page 3

ELECTRICAL CHARACTERISTICS (continued) ( -5V, DGND = AGND = REF- = 0V, REF+ = 545mV 32,768Hz, 60Hz mode CLK A MIN PARAMETER SYMBOL DIGITAL SECTION Output High ...

Page 4

ADC with Serial Interface __________________________________________Typical Operating Characteristics ERROR vs. COMMON-MODE INPUT VOLTAGE (V LO–AGND -0.05 -0.10 -0.15 -0.20 -0.25 -0. COMMON-MODE VOLTAGE (V) ...

Page 5

Description (continued) PIN NAME 9 P2 User-programmable output bit 2—programmed through the serial port User-programmable output bit 3—programmed through the serial port. 11 EOC End of Conversion Output goes high at end of conversion. 12 DGND Digital ...

Page 6

ADC with Serial Interface ____________Functional Description The MAX132 integrates the input voltage for a fixed period of time, then deintegrates a known reference voltage and measures the time required to reach zero. Good line rejection is achieved by setting ...

Page 7

The pseudo- differential input voltage is applied across pins 14 and 15 (IN HI, IN LO), and can range to within 2V of either supply rail. ...

Page 8

ADC with Serial Interface Differential Reference Inputs and Rollover Error The main source of rollover voltage error is due to common-mode voltages. This error is caused by the reference capacitor losing or gaining charge to stray capacitance. A positive ...

Page 9

Table 1. Crystal Frequencies and Integrator Capacitors for 50Hz to 60Hz Operation Crystal C /60Hz INT Conv/sec Freq. (pF) (Hz) 16 32,768 4700 32 65,536 2700 48 98, 304 1800 64 131,072 1200 80 163,840 1000 96 196,608 820 Note: ...

Page 10

ADC with Serial Interface ___________________Digital Interface Serial data at DIN is sent in 8-bit packets and is shifted into the internal 8-bit shift register with each rising edge of SCLK. The data is then latched into either command input ...

Page 11

Averaging read-zero measurements provides the most accurate read-zero value. Perform a read-zero sequence whenever a large change in the input voltage is expected. When the sleep bit is set to 1, (bit D5 in command input register ...

Page 12

ADC with Serial Interface Table 4. Overrange Values for Resolution Used Bits Resolution Soft Overrange Used Bits Start Value B18–B3 ±15 34,880 B18–B2 ±16 69,760 B18–B1 ±17 139,520 B18–B0 ±18 279,040 Table 5. Output Values for 16-Bit Resolution (Offset ...

Page 13

To deter- mine collision status, read the status register collision bit before and after reading output registers 0 and 1. Collisions will not occur if a conversion’s read cycle is completed ...

Page 14

ADC with Serial Interface Second Deintegrate Phase The second deintegrate phase deintegrates residual voltage on the integration capacitor that has been through the X8 phase. Since the voltage across the integration capacitor has been multiplied by 8, each deintegration ...

Page 15

The cur- rent source delivers 2mA, resulting in about 500mV across the 250Ω resistor—suitable to fit the MAX132’s ±512mV full-scale range. Note that the accuracy of the reference resistor (0.1%) sets the ...

Page 16

ADC with Serial Interface WAIT UNTIL EOC PIN IS HIGH CLEAR SCLK CLEAR CS WRITE DIN132 FROM TxByte’s MSB SET SCLK READ DOUT132 INTO RxByte’s LSB CLEAR SCLK SHIFT RxByte LEFT SHIFT TxByte LEFT REPEAT 8 TIMES SET CS ...

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