19-0283; Rev 5; 11/98
IT
TION K
VALUA
E
BLE
AVAILA
Low-Cost, 2-Channel, ±14-Bit Serial ADCs
General Description
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.
____________________________Features
o
o
o
o
o
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:
550µA (MAX110)
640µA (MAX111)
4µA Shutdown Current
Up to 50 Conversions/sec
50Hz/60Hz Rejection
Auto-Calibration Mode
No External Components Required
16-Pin DIP/SO, 20-Pin SSOP
MAX110/MAX111
o
o
o
o
o
Ordering Information
PART
MAX110ACPE
TEMP. RANGE
0°C to +70°C
PIN-PACKAGE INL(%)
16 Plastic DIP
±0.03
________________________Applications
Process Control
Weigh Scales
Panel Meters
Data-Acquisition Systems
Temperature Measurement
MAX110BCPE
0°C to +70°C
16 Plastic DIP
±0.05
MAX110ACWE
0°C to +70°C
16 Wide SO
±0.03
MAX110BCWE
0°C to +70°C
16 Wide SO
±0.05
MAX110ACAP
0°C to +70°C
20 SSOP
±0.03
MAX110BCAP
0°C to +70°C
20 SSOP
±0.05
MAX110BC/D
0°C to +70°C
Dice*
±0.05
Ordering Information continued at end of data sheet.
*
Contact factory for dice specifications.
Typical Operating Circuit
+5V
Pin Configurations
TOP VIEW
IN1+
V
DD
IN1+
RCSEL
1
2
3
4
5
6
7
8
16
15
IN1-
IN2+
IN2-
V
SS
(AGND)
GND
DIN
DOUT
CS
REF-
REF+
V
DD
RCSEL
XCLK
IN1-
MAX110
IN2+
IN2-
REF+
REF-
CS
SCLK
DIN
V
SS
(AGND) DOUT
FROM
µC
MAX111
MAX110
MAX111
14
13
12
11
10
9
SCLK
BUSY
( ) ARE FOR MAX111
DIP/SO
( ) ARE FOR MAX111
-5V (0V)
Pin Configurations continued at end of data sheet.
SPI and QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp.
________________________________________________________________
Maxim Integrated Products
1
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.
Low-Cost, 2-Channel, ±14-Bit Serial ADCs
MAX110/MAX111
ABSOLUTE MAXIMUM RATINGS
V
DD
to GND ...........................................................................+6V
V
SS
to GND (MAX110)..............................................+0.3V to -6V
AGND to DGND.....................................................-0.3V to +0.3V
V
IN1+
, V
IN1-
......................................(V
DD
+ 0.3V) to (V
SS
- 0.3V)
V
IN2+
, V
IN2-
......................................(V
DD
+ 0.3V) to (V
SS
- 0.3V)
V
REF+
, V
REF-
....................................(V
DD
+ 0.3V) to (V
SS
- 0.3V)
Digital Inputs and Outputs .........................(V
DD
+ 0.3V) to -0.3V
Continuous Power Dissipation
16-Pin Plastic DIP (derate 10.53mW/°C above +70°C).....842mW
16-Pin Wide SO (derate 9.52mW/°C above +70°C) ......762mW
20-Pin SSOP (derate 8.00mW/°C above +70°C) ...........640mW
16-Pin CERDIP (derate 10.00mW/°C above +70°C)......800mW
Operating Temperature Ranges
MAX11_ _C_ _......................................................0°C to +70°C
MAX11_ _E_ _ ...................................................-40°C to +85°C
MAX11_BMJE .................................................-55°C to +125°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS—MAX110
PARAMETER
ACCURACY
(Note 1)
Resolution
Differential Nonlinearity
No-Missing-Codes
Resolution
RES
DNL
(Note 2)
(Notes 3, 4)
(Note 3)
MAX110AC/E
Relative Accuracy
(Notes 3, 5–7)
INL
MAX110BC/E
MAX110BM
Offset Error
Offset Error
Temperature Drift
Common-Mode Rejection
Ratio
Full-Scale Error
Full-Scale Error
Temperature Drift
Power-Supply Rejection
ANALOG INPUTS
Differential Input Voltage
Range
Absolute Input Voltage
Range
Input Bias Current
Input Capacitance
V
IN
V
IN+
,
V
IN-
I
IN+
, I
IN-
(Note 3)
(Note 6)
CMRR
V
IN+
= V
IN-
= 0V
After offset null
Uncalibrated
SYMBOL
(V
DD
= 5V ±5%, V
SS
= -5V ±5%, f
XCLK
= 1MHz,
÷
2 mode (DV2 = 1), 81,920 CLK cycles/conv, V
REF+
= 1.5V, V
REF-
= -1.5V,
T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
CONDITIONS
MIN
14 + POL
+ OFL
±2
13 + POL
+ OFL
-V
REF
≤
V
IN
≤
V
REF
-0.83 x V
REF
≤
V
IN
≤
0.83 x V
REF
-V
REF
≤
V
IN
≤
V
REF
-0.83 x V
REF
≤
V
IN
≤
0.83 x V
REF
-V
REF
≤
V
IN
≤
V
REF
-0.83 x V
REF
≤
V
IN
≤
0.83 x V
REF
0.003
0.02
6
±0.1
-8
8
V
SS
= -5V, V
DD
= 4.75V to 5.25V
V
DD
= 5V, V
SS
= -4.75V to -5.25V
15
30
0
±0.03
±0.04
±0.018
±0.1
±0.05
±4
mV
µV/°C
ppm/V
%
ppm/°C
ppm
±0.06
±0.015 ±0.03
%FSR
TYP
MAX
UNITS
Bits
LSB
Bits
-2.5V
≤
(V
IN+
= V
IN-
)
≤
2.5V
After gain calibration (Note 5)
Uncalibrated
-V
REF
V
SS
+
2.25
+V
REF
V
DD
-
2.25
500
10
V
V
nA
pF
2
_______________________________________________________________________________________
Low-Cost, 2-Channel, ±14-Bit Serial ADCs
ELECTRICAL CHARACTERISTICS—MAX110 (continued)
PARAMETER
REFERENCE INPUTS
Differential Reference
Input Voltage Range
Absolute Reference Input
Voltage Range
Reference Input Current
Reference Input
Capacitance
CONVERSION TIME
Synchronous Conversion
Time (Note 7)
Oversampling Clock
Frequency
Input High Voltage
Input Low Voltage
Input Capacitance
Input Leakage Current
I
LKG
t
CONV
f
OSC
10,240 clock-cycles/conversion
102,400 clock-cycles/conversion
(Note 8)
0.25
20.48
204.80
1.25
ms
MHz
V
REF
V
REF+
,
V
REF-
I
REF+
,
I
REF-
V
REF+
= 2.5V, V
REF-
= 0V
(Note 3)
0
V
SS
+
2.25
3.0
V
DD
-
2.25
500
10
V
V
nA
pF
SYMBOL
CONDITIONS
MAX110/MAX111
(V
DD
= 5V ±5%, V
SS
= -5V ±5%, f
XCLK
= 1MHz,
÷
2 mode (DV2 = 1), 81,920 CLK cycles/conv, V
REF+
= 1.5V, V
REF-
= -1.5V,
T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
MIN
TYP
MAX
UNITS
DIGITAL INPUTS
(CS, SCLK, DIN, and XCLK when RCSEL = 0V)
V
IH
V
IL
(Note 3)
Digital inputs at 0V or 5V
DOUT,
BUSY,
I
SINK
= 1.6mA
XCLK, I
SINK
= 200µA
DOUT,
BUSY,
V
DD
= 4.75V, I
SOURCE
= 1.0mA
XCLK, V
DD
= 4.75V, I
SOURCE
= 200µA
Leakage Current
Output Capacitance
Positive Supply Voltage
Negative Supply Voltage
V
DD
V
SS
I
LKG
V
OUT
= 5V or 0V
(Note 3)
Performance guaranteed by supply rejection test
Performance guaranteed by supply rejection test
f
XCLK
= 500kHz,
continuous-conversion mode
XCLK unloaded,
continuous-conversion mode, RC
oscillator operational (Note 9)
f
XCLK
= 500kHz,
continuous-conversion mode
4.75
-4.75
550
780
320
4
0.05
650
10
2
µA
µA
V
DD
- 0.5
V
DD
- 0.5
±10
10
5.25
-5.25
950
µA
µA
pF
V
V
2.4
0.8
10
±1
0.4
0.4
V
V
pF
µA
DIGITAL OUTPUTS
(DOUT,
BUSY,
and XCLK when RCSEL = V
DD
)
Output Low Voltage
V
OL
V
Output High Voltage
V
OH
V
POWER REQUIREMENTS
(all digital inputs at 0V or 5V)
Positive Supply Current
I
DD
V
DD
= 5.25V,
V
SS
= -5.25V
V
DD
= 5.25V,
V
SS
= -5.25V
Negative Supply Current
Power-Down Current
I
SS
I
DD
I
SS
V
DD
= 5.25V, V
SS
= -5.25V, V
XCLK
= 0V, PD = 1
_______________________________________________________________________________________
3
Low-Cost, 2-Channel, ±14-Bit Serial ADCs
MAX110/MAX111
ELECTRICAL CHARACTERISTICS—MAX111
(V
DD
= 5V ±5%, f
XCLK
= 1MHz, ÷ 2 mode (DV2 = 1), 81,920 CLK cycles/conv, V
REF+
= 1.5V, V
REF-
= 0V, T
A
= T
MIN
to T
MAX
,
unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
ACCURACY
(Note 1)
Resolution
Differential Nonlinearity
No-Missing-Codes
Resolution
RES
DNL
(Note 2)
(Notes 3, 4)
(Note 3)
MAX111AC/E
Relative Accuracy,
Differential Input
(Notes 3, 5–7)
INL
MAX111BC/E
MAX111BM
MAX111AC/E
Relative Accuracy,
Single-Ended Input
(IN- = GND)
INL
MAX111BC/E
MAX111BM
Offset Error
Common-Mode Rejection
Ratio
Full-Scale Error
Full-Scale Error
Temperature Drift
Power-Supply Rejection
ANALOG INPUTS
Differential Input Voltage
Range
Absolute Input Voltage
Range
Input Bias Current
Input Capacitance
V
IN
V
IN+
,
V
IN-
I
IN+
, I
IN-
(Note 3)
(Note 6)
-V
REF
0
+V
REF
V
DD
- 3.2
500
10
V
V
nA
pF
V
DD
= 4.75V to 5.25V
CMRR
V
IN+
= V
IN-
= 0V
10mV
≤
(V
IN+
= V
IN-
)
≤
2.0V
After gain calibration (Note 5)
Uncalibrated
-8
8
15
6
±0.2
0
-V
REF
≤
V
IN
≤
V
REF
-0.667 x V
REF
≤
V
IN
≤
0.667 x V
REF
-V
REF
≤
V
IN
≤
V
REF
-0.667 x V
REF
≤
V
IN
≤
0.667 x V
REF
-V
REF
≤
V
IN
≤
V
REF
-0.667 x V
REF
≤
V
IN
≤
0.667 x V
REF
0V
≤
V
IN
≤
V
REF
V
IN
≤
0.667 x V
REF
0V
≤
V
IN
≤
V
REF
V
IN
≤
0.667 x V
REF
0V
≤
V
IN
≤
V
REF
V
IN
≤
0.667 x V
REF
±0.1
±0.06
±0.18
±0.10
±0.25
±0.15
±4
mV
ppm/V
%
ppm/°C
ppm
%FSR
13 + POL
+ OFL
±0.05
±0.03
±0.10
±0.05
±0.18
±0.10
±0.25
±0.20
%FSR
14 + POL
+ OFL
±2
Bits
LSB
Bits
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
4
_______________________________________________________________________________________
Low-Cost, 2-Channel, ±14-Bit Serial ADCs
ELECTRICAL CHARACTERISTICS—MAX111 (continued)
(V
DD
= 5V ±5%, f
XCLK
= 1MHz, ÷ 2 mode (DV2 = 1), 81,920 CLK cycles/conv, V
REF+
= 1.5V, V
REF-
= 0V, T
A
= T
MIN
to T
MAX
,
unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
REFERENCE INPUTS
Differential Reference
Input Voltage Range
Absolute Reference Input
Voltage Range
Reference Input Current
Reference Input
Capacitance
CONVERSION TIME
Synchronous Conversion
Time (Note 7)
Oversampling Clock
Frequency
Input High Voltage
Input Low Voltage
Input Capacitance
Input Leakage Current
I
LKG
t
CONV
f
OSC
10,240 clock-cycles/conversion
102,400 clock-cycles/conversion
(Note 8)
0.25
20.48
204.80
1.25
ms
MHz
V
REF
V
REF+
,
V
REF-
I
REF+
,
I
REF-
V
REF+
= 1.5V, V
REF-
= 0V
(Note 3)
0
0
1.5
V
DD
- 3.2
500
10
V
V
nA
pF
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX110/MAX111
DIGITAL INPUTS
(CS, SCLK, DIN, and XCLK when RCSEL = 0V)
V
IH
V
IL
(Note 3)
Digital inputs at 0V or 5V
DOUT,
BUSY,
I
SINK
= 1.6mA
XCLK, I
SINK
= 200µA
DOUT,
BUSY,
V
DD
= 4.75V, I
SOURCE
= 1.0mA
XCLK, V
DD
= 4.75V, I
SOURCE
= 200µA
Leakage Current
Output Capacitance
Positive Supply Voltage
V
DD
I
LKG
V
OUT
= 5V or 0V
(Note 3)
Performance guaranteed by supply rejection test
f
XCLK
= 500kHz,
continuous-conversion mode
V
DD
= 5.25V
XCLK unloaded,
continuous-conversion mode, RC
oscillator operational (Note 9)
V
DD
= 5.25V, V
XCLK
= 0V, PD = 1
4.75
640
960
4
10
µA
V
DD
- 0.5
V
DD
- 0.5
±1
10
5.25
1200
µA
µA
pF
V
2.4
0.8
10
±1
0.4
0.4
V
V
pF
µA
DIGITAL OUTPUTS
(DOUT,
BUSY,
and XCLK when RCSEL = V
DD
)
Output Low Voltage
V
OL
V
Output High Voltage
V
OH
V
POWER REQUIREMENTS
(all digital inputs at 0V or 5V)
Supply Current
I
DD
Power-Down Current
I
DD
_______________________________________________________________________________________
5
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