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19-1857; Rev 0; 11/00
IT
TION K
VALUA
E
BLE
AVAILA
Single-Supply, Low-Power,
2-Channel, Serial 8-Bit ADCs
General Description
Features
♦
Single Supply
+2.7V to +3.6V (MAX1117)
+2.7V to +5.5V (MAX1118)
+4.5V to +5.5V (MAX1119)
♦
Internal Track/Hold: 100kHz Sampling Rate
♦
Internal Reference
+2.048V (MAX1117)
+4.096V (MAX1119)
♦
Reference Input Range: 0 to V
DD
(MAX1118)
♦
SPI/QSPI/MICROWIRE-Compatible Serial Interface
♦
Small 8-Pin SOT23 Package
♦
Automatic Power-Down
♦
Analog Input Range: 0 to V
REF
♦
Low Power
175µA at 100ksps (typ) (MAX1117/MAX1119)
135µA at 100ksps (typ) (MAX1118)
18µA at 10ksps (typ)
1µA (typ) in Power-Down Mode
MAX1117/MAX1118/MAX1119
The MAX1117/MAX1118/MAX1119 low-power, 8-bit,
dual-channel, analog-to-digital converters (ADCs) fea-
ture an internal track/hold (T/H) voltage reference
(MAX1117/MAX1119), clock, and serial interface. The
MAX1118 is specified from +2.7V to +5.5V and con-
sumes only 135µA at 100ksps. The MAX1117 is speci-
fied from +2.7V to +3.6V, and the MAX1119 is specified
from +4.5V to +5.5V, each consumes only 175µA at
100ksps.
The full-scale analog input range is determined by the
internal reference of +2.048V (MAX1117) or +4.096V
(MAX1119), or by an externally applied reference rang-
ing from +1V to V
DD
(MAX1118). All devices feature an
automatic shutdown mode that reduces supply current
to <1µA when the device is not in use. The 3-wire serial
interface directly connects to SPI™, QSPI™, and
MICROWIRE™ devices without external logic.
Conversions up to 100ksps are performed using an
internal clock.
The MAX1117/MAX1118/MAX1119 are available in an
8-pin SOT23 package with a footprint that is only 11%
of an 8-pin plastic DIP.
________________________Applications
Low-Power, Handheld Portable Devices
System Diagnostics
Battery-Powered Test Equipment
Solar-Powered Remote Systems
Receive Signal Strength Indicators
4mA to 20mA Powered Remote Data Acquisition
Systems
PART
MA X1 11 7
EKA
MA X1 11 8
EKA
MA X1 11 9
EKA
Ordering Information
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-
PACKAGE
8 SOT23
8 SOT23
8 SOT23
TOP
MARK
AADW
AADX
AADY
Pin Configuration
TOP VIEW
SPI/QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor, Corp.
V
DD
1
CHO
CH1
GND
2
3
4
8
7
SCLK
DOUT
CNVST
(REF) I.C
MAX1117
MAX1118
MAX1119
SOT23
6
5
Functional Diagram appears at end of data sheet.
( ) ARE FOR MAX1118 ONLY
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim's website at www.maxim-ic.com.
Single-Supply, Low-Power,
2-Channel, Serial 8-Bit ADCs
MAX1117/MAX1118/MAX1119
ABSOLUTE MAXIMUM RATINGS
V
DD
to GND ...........................................................-0.3V to +6.0V
CH0,CH1, REF to GND...............................-0.3V to (V
DD
+ 0.3V)
Digital Output to GND ................................-0.3V to (V
DD
+ 0.3V)
Digital Input to GND ..............................................-0.3V to +6.0V
Maximum Current into Any Pin .........................................±50mA
Continuous Power Dissipation (T
A
= +70°C)
8-Pin SOT23 (derate 8.9mW/°C above +70°C)............714mW
Operating Temperature Range
MAX1117EKA ..................................................-40°C to + 85°C
MAX1118EKA ..................................................-40°C to + 85°C
MAX1119EKA ..................................................-40°C to + 85°C
Storage Temperature Range .............................-60°C to +150°C
Lead Temperature (soldering, 10s) .................................+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
(V
DD
= +2.7V to +3.6V (MAX1117), V
DD
= +4.5V to +5.5V (MAX1119), V
DD
= REF = +2.7V to +5.5V (MAX1118),T
A
= T
MIN
to T
MAX
,
unless otherwise noted.)
PARAMETER
DC ACCURACY
Resolution
Relative Accuracy (Note 1)
Differential Nonlinearity
Offset Error
Gain Error
Gain Temperature Coefficient
Total Unadjusted Error
Channel-to-Channnel Offset
Matching
TUE
MAX1118, REF = V
DD
MAX1117/MAX1119
MAX1118
MAX1117/MAX1119
MAX1118
±5
±90
±0.5
±0.1
±1
INL
DNL
8
±1
±1
±0.5
±1
±5
Bits
LSB
LSB
LSB
LSB
%FSR
ppm/°C
LSB
LSB
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DYNAMIC PERFORMANCE
(25kHz sinewave input, V
IN
= V
REF(pp)
, f
SCLK
= 5MHz, f
sample
= 100ksps, R
IN
= 100Ω)
48
Signal-to-Noise Plus Distortion
SINAD
Total Harmonic Distortion
(Up to the 5th Harmonic)
Spurious-Free Dynamic Range
Small Signal Bandwidth
ANALOG INPUT
Input Voltage Range
Input Leakage
Current
Input Capacitance
INTERNAL REFERENCE
Voltage
V
REF
MAX1117
MAX1119
2.048
4.096
C
IN
V
CH
_ = 0 or V
DD
0
±0.7
18
V
REF
±10
THD
SFDR
f
-3dB
-69
66
4
dB
dB
dB
MHz
V
µA
pF
V
2
_______________________________________________________________________________________
Single-Supply, Low-Power,
2-Channel, Serial 8-Bit ADCs
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +2.7V to +3.6V (MAX1117), V
DD
= +4.5V to +5.5V (MAX1119), V
DD
= REF = +2.7V to +5.5V (MAX1118),T
A
= T
MIN
to T
MAX
,
unless otherwise noted.)
PARAMETER
Input Voltage Range
Input Current
POWER REQUIREMENTS
MAX1118
Supply Voltage
V
DD
MAX1117
MAX1119
MAX1119, f
SAMPLE
= 100ksps,
zero-scale input
MAX1117/MAX1118, f
SAMPLE
= 100ksps,
zero-scale input
Supply Current (Note 2)
I
DD
MAX1119, f
SAMPLE
= 10ksps,
zero-scale input
MAX1117/MAX1118, f
SAMPLE
= 10ksps,
zero-scale input
Shutdown
Supply Rejection Ratio
Input High Voltage
Input Low Voltage
Input Hystersis
Input Current High
Input Current Low
Input Capacitance
DIGITAL OUTPUT (DOUT)
Output High Voltage
Output Low Voltage
Three-State Leakage Current
Three-State Output Capacitance
CNVST High Time
CNVST Low Time
Conversion Time
Serial Clock High Time
Serial Clock Low Time
Serial Clock Period
Falling of CNVST to DOUT Active
PSRR
V
IH
V
IL
V
HYST
I
IH
I
IL
C
IN
V
OH
V
OL
I
L
C
OUT
t
csh
t
csi
t
conv
t
ch
t
cl
t
cp
t
csd
C
LOAD
= 100pF, Figure 1
75
75
200
100
100
100
7.5
I
SOURCE
= 2mA
I
SINK
= 2mA
I
SINK
= 4mA
±0.01
4
V
DD
- 0.5
0.4
0.8
±10
2
0.2
±10
±10
Full-scale or 0 input
2
0.8
DIGITAL INPUTS (CNVST AND SCLK)
V
V
V
µA
µA
pF
V
V
V
µA
pF
ns
ns
µs
ns
ns
ns
ns
2.7
2.7
4.5
182
135
19
14
0.8
±0.5
5.5
5.5
5.5
230
190
25
21
10
±1
LSB/V
µA
V
Ave, V
DD
= REF = +5.5V at 100ksps
SYMBOL
CONDITIONS
MIN
1.0
10
TYP
MAX
V
DD
20
UNITS
V
µA
MAX1117/MAX1118/MAX1119
EXTERNAL REFERENCE
(MAX1118 ONLY)
TIMING CHARACTERISTICS
(Figures 6a–6d)
_______________________________________________________________________________________
3
Single-Supply, Low-Power,
2-Channel, Serial 8-Bit ADCs
MAX1117/MAX1118/MAX1119
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +2.7V to +3.6V (MAX1117), V
DD
= +4.5V to +5.5V (MAX1119), V
DD
= REF = +2.7V to +5.5V (MAX1118),T
A
= T
MIN
to T
MAX
,
unless otherwise noted.)
PARAMETER
Serial Clock Falling Edge to
DOUT
Serial Clock Rising Edge to
DOUT High-Z
Last Serial Clock to Next CNVST
(Successive Conversions on
CH0)
SYMBOL
t
cd
t
chz
CONDITIONS
C
LOAD
= 100pF
C
LOAD
= 100pF, Figure 2
MIN
10
TYP
MAX
100
UNITS
ns
ns
100
500
t
ccs
50
ns
Note 1:
Relative accuracy is the deviation of the analog value at any code from its theoretical value after the full-scale range and off-
set have been calibrated.
Note 2:
Input = 0, with logic input levels of 0 and V
DD
.
Typical Operating Characteristics
(V
DD
= +3V (MAX1117), V
DD
= +5V (MAX1119), V
DD
= V
REF
= +3V (MAX1118), f
SCLK
= 5MHz, f
SAMPLE
= 100ksps, C
LOAD
= 100pF,
T
A
= +25°C, unless otherwise noted.)
INTEGRAL NONLINEARITY
vs.OUTPUT CODE
MAX1117/18/19 toc01
DIFFERENTIAL NONLINEARITY
vs.OUTPUT CODE
0.8
0.6
0.4
DNL (LSB)
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
0.1
0
0
50
100
150
200
250
300
2.5
OUTPUT CODE
MAX1117/18/19 toc02
SHUTDOWN SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX1117/18/19 toc03
1.0
0.8
0.6
0.4
INL (LSB)
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
0
50
100
150
200
250
1.0
0.7
0.6
SHUTDOWN CURRENT (μA)
0.5
0.4
0.3
0.2
300
OUTPUT CODE
3.5
4.5
SUPPLY VOLTAGE (V)
5.5
MAX1118
SUPPLY CURRENT vs. CONVERSION RATE
MAX1117/18/19 toc04
MAX1118
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX1117/18/19 toc05
MAX1118 SUPPLY CURRENT
vs. TEMPERATURE
MAX1117/18/19 toc06
100.0
V
DD
= V
REF
= V
DIGITAL
SUPPLY CURRENT (μA)
160
140
SUPPLY CURRENT (μA)
120
110
80
60
40
20
D
OUT
= 00000000
V
DD
= V
REF
= V
DIGITAL INPUTS
150
10.0
SUPPLY CURRENT (μA)
V
DD
= +5V
100
V
DD
= +3V
50
D
OUT
= 00000000
V
DD
= V
REF
= V
DIGITAL INPUTS
0
V
DD
= +5V
1.0
V
DD
= +3V
0.1
0.01
0.1
1
10
100
CONVERSION (ksps)
0
2.5
3.5
4.5
5.5
SUPPLY VOLTAGE (V)
-40
-15
10
35
60
85
TEMPERATURE (°C)
4
_______________________________________________________________________________________
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