MAX111AEPE Maxim Integrated Products, MAX111AEPE Datasheet

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MAX111AEPE

Manufacturer Part Number
MAX111AEPE
Description
Low-cost, 2-channel, 14-bit serial ADC.
Manufacturer
Maxim Integrated Products
Datasheet

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MAX111AEPE+
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The MAX110/MAX111 analog-to-digital converters
(ADCs) use an internal auto-calibration technique to
achieve 14-bit resolution plus overrange, with no exter-
nal components. Operating supply current is only
550µA (MAX110) and reduces to 4µA in power-down
mode, making these ADCs ideal for high-resolution bat-
tery-powered or remote-sensing applications. A fast
serial interface simplifies signal routing and opto-isola-
tion, saves microcontroller pins, and offers compatibility
with SPI™, QSPI™, and MICROWIRE™. The MAX110
operates with ±5V supplies, and converts differential
analog signals in the -3V to +3V range. The MAX111
operates with a single +5V supply and converts differ-
ential analog signals in the ±1.5V range, or single-
ended signals in the 0V to +1.5V range.
Internal calibration allows for both offset and gain-error
correction under microprocessor (µP) control. Both
devices are available in space-saving 16-pin DIP and
SO packages, as well as an even smaller 20-pin SSOP
package.
________________________Applications
SPI and QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp.
19-0283; Rev 5; 11/98
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
( ) ARE FOR MAX111
Process Control
Weigh Scales
Panel Meters
Data-Acquisition Systems
Temperature Measurement
Typical Operating Circuit
Low-Cost, 2-Channel, ±14-Bit Serial ADCs
________________________________________________________________ Maxim Integrated Products
General Description
IN1+
IN1-
IN2+
IN2-
REF+
REF-
MAX110
MAX111
-5V (0V)
(AGND)
V
+5V
V
SS
DD
RCSEL
DOUT
SCLK
DIN
CS
FROM C
____________________________Features
Ordering Information continued at end of data sheet.
*
MAX110ACPE
MAX110BCPE
MAX110ACWE
MAX110BCWE
MAX110ACAP
MAX110BCAP
MAX110BC/D
Pin Configurations continued at end of data sheet.
Contact factory for dice specifications.
Single +5V Supply (MAX111)
Two Differential Input Channels
14-Bit Resolution Plus Sign and Overrange
0.03% Linearity (MAX110)
0.05% Linearity (MAX111)
Low Power Consumption:
Up to 50 Conversions/sec
50Hz/60Hz Rejection
Auto-Calibration Mode
No External Components Required
16-Pin DIP/SO, 20-Pin SSOP
TOP VIEW
550µA (MAX110)
640µA (MAX111)
4µA Shutdown Current
PART
( ) ARE FOR MAX111
RCSEL
XCLK
SCLK
BUSY
REF+
REF-
IN1+
V
DD
1
2
3
4
5
6
7
8
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
Ordering Information
MAX110
MAX111
DIP/SO
Pin Configurations
PIN-PACKAGE
16 Plastic DIP
16 Plastic DIP
16 Wide SO
16 Wide SO
20 SSOP
20 SSOP
Dice*
16
15
14
13
12
11
10
9
IN1-
IN2+
IN2-
V
GND
DIN
DOUT
CS
SS
(AGND)
INL(%)
±0.03
±0.05
±0.03
±0.05
±0.03
±0.05
±0.05
1

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MAX111AEPE Summary of contents

Page 1

... ARE FOR MAX111 -5V (0V) SPI and QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp. ________________________________________________________________ Maxim Integrated Products For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 1-800-835-8769. ____________________________Features Single +5V Supply (MAX111) ...

Page 2

Low-Cost, 2-Channel, ±14-Bit Serial ADCs ABSOLUTE MAXIMUM RATINGS V to GND ...........................................................................+ GND (MAX110)..............................................+0.3V to -6V SS AGND to DGND.....................................................-0.3V to +0. ......................................(V IN1+ IN1 ......................................(V IN2+ IN2 ...

Page 3

Low-Cost, 2-Channel, ±14-Bit Serial ADCs ELECTRICAL CHARACTERISTICS—MAX110 (continued ±5 -5V ±5 XCLK unless otherwise noted. Typical values are MIN MAX PARAMETER SYMBOL REFERENCE ...

Page 4

Low-Cost, 2-Channel, ±14-Bit Serial ADCs ELECTRICAL CHARACTERISTICS—MAX111 ( ±5 1MHz, ÷ 2 mode (DV2 = 1), 81,920 CLK cycles/conv XCLK unless otherwise noted. Typical values are at T PARAMETER SYMBOL ACCURACY (Note 1) Resolution ...

Page 5

Low-Cost, 2-Channel, ±14-Bit Serial ADCs ELECTRICAL CHARACTERISTICS—MAX111 (continued ±5 1MHz, ÷ 2 mode (DV2 = 1), 81,920 CLK cycles/conv XCLK unless otherwise noted. Typical values are at T PARAMETER SYMBOL REFERENCE INPUTS Differential ...

Page 6

Low-Cost, 2-Channel, ±14-Bit Serial ADCs Note 1: These specifications apply after auto-null and gain calibration. Performance at power-supply tolerance limits is guaranteed by power-supply rejection tests. Tests are performed at V Note 2: 32,768 LSBs cover an input voltage range ...

Page 7

Low-Cost, 2-Channel, ±14-Bit Serial ADCs __________________________________________Typical Operating Characteristics (MAX110 5V -5V REF+ 81,920 clocks/conv +25°C, unless otherwise noted.) A MAX110 RELATIVE ACCURACY (-0.83 ...

Page 8

Low-Cost, 2-Channel, ±14-Bit Serial ADCs ____________________________Typical Operating Characteristics (continued) (MAX111 5V 1.5V REF+ REF- 81,920 clocks/conv +25°C, unless otherwise noted.) A MAX111 RELATIVE ACCURACY (-0.667V < V < 0.667V REF IN 0.10 ...

Page 9

Low-Cost, 2-Channel, ±14-Bit Serial ADCs ______________________________________________________________Pin Description PIN NAME DIP/SO SSOP 1 1 IN1 REF REF RCSEL 6 8 XCLK 7 9 SCLK BUSY ...

Page 10

Low-Cost, 2-Channel, ±14-Bit Serial ADCs IN1+ IN1- IN+ IN2+ INPUT Gm IN- MUX IN2- REF+ REF- Gm MAX110 MAX111 Figure 1. Functional Diagram Oversampling Clock XCLK internally connects to a clock-frequency divider network, whose output is the ADC oversampling clock, ...

Page 11

Low-Cost, 2-Channel, ±14-Bit Serial ADCs + RCSEL MAX110 MAX111 TTL/CMOS XCLK V (AGND) SS -5V (0V ARE FOR MAX111. Figure 3a. Connection for External-Clock Mode The output data from the MAX110/MAX111 is arranged in twos-complement format ...

Page 12

Low-Cost, 2-Channel, ±14-Bit Serial ADCs POL OFL D13... .000 +OVERFLOW .111 .110 .101 .100 0 ...

Page 13

Low-Cost, 2-Channel, ±14-Bit Serial ADCs CS t CSH SCLK t DS DIN t DA DOUT BUSY END OF CONVERSION Figure 6. Detailed Serial-Interface Timing +5V I/O SCK µP MISO MOSI SS MASKABLE INTERRUPT a. SPI/QSPI I/O SK µ ...

Page 14

Low-Cost, 2-Channel, ±14-Bit Serial ADCs ST 1 BYTE READ/WRITE BUSY CS SCLK DOUT POL OFL D13 D12 DIN NU NU CONV4 CONV3 CONV2 CONV1 DV4 NO OP Figure 8a. SPI/MICROWIRE-Interface Timing BUSY CS SCLK DOUT POL OFL D13 DIN NO ...

Page 15

Low-Cost, 2-Channel, ±14-Bit Serial ADCs Table 1. Input Control-Word Bit Map NO- CONV4 CONV3 First bit clocked in. BIT NAME NO- 13 9–12 CONV1–CONV4 7, 8 DV2, DV4 ...

Page 16

Low-Cost, 2-Channel, ±14-Bit Serial ADCs Table 2. Allowable Input Multiplexer Configurations CAL NUL CHS ADC IN IN1 IN2 ...

Page 17

Low-Cost, 2-Channel, ±14-Bit Serial ADCs 3-Step Calibration The data sheet electrical specifications apply to the device after optional calibration of gain error and offset. Uncalibrated, the gain error is typically 2%. Table 3 describes the three steps required to calibrate ...

Page 18

Low-Cost, 2-Channel, ±14-Bit Serial ADCs CONVERSION TIME LINE CYCLE PERIOD SIGNAL FREQUENCY IN Hz FOR 100ms CONVERSION TIME (see Table 6) Figure 9. MAX110/MAX111 Noise Rejection Follows SIN( Function Selecting the Oversampling Clock Frequency Choose the oversampling frequency, ...

Page 19

Low-Cost, 2-Channel, ±14-Bit Serial ADCs POWER SUPPLIES +5V -5V 4 0 GND V DD MAX110 *OPTIONAL Figure 10a. MAX110 Power-Supply Grounding Connections A 100ms conversion time cannot be achieved with ...

Page 20

Low-Cost, 2-Channel, ±14-Bit Serial ADCs +5V 30mV FULL-SCALE +5V 121k 121k Figure 11. Weigh Scale Application Capacitive Loading Effects of XCLK in Internal RC-Oscillator Mode When using the internal RC oscillator, capacitive load- ing effects on the XCLK pin must ...

Page 21

Low-Cost, 2-Channel, ±14-Bit Serial ADCs + TEMP MAX874 K-TYPE OUT Figure 12. Thermocouple Circuit with Software Compensation unloaded, and subtracting this value from actual weight measurements. The lowpass filtering action of the MAX111’s sigma-delta converter helps minimize noise. ...

Page 22

... Wide SO MAX111ACAP 0°C to +70°C 20 SSOP MAX111BCAP 0°C to +70°C 20 SSOP MAX111BC/D 0°C to +70°C Dice* MAX111AEPE -40°C to +85°C 16 Plastic DIP MAX111BEPE -40°C to +85°C 16 Plastic DIP MAX111AEWE -40°C to +85°C 16 Wide SO MAX111BEWE -40°C to +85°C 16 Wide SO MAX111AEAP -40° ...

Page 23

Low-Cost, 2-Channel, ±14-Bit Serial ADCs _______________________________________________________Package Information ______________________________________________________________________________________ 23 ...

Page 24

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 24 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 1998 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products ...

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