19-2036; Rev 3; 8/10
KIT
ATION
EVALU
BLE
AVAILA
150ksps, 10-Bit, 2-Channel Single-Ended, and
1-Channel True-Differential ADCs in SOT23 and TDFN
General Description
The MAX1086–MAX1089 are low-cost, micropower, ser-
ial output 10-bit analog-to-digital converters (ADCs)
available in a tiny 8-pin SOT23. The MAX1086/MAX1088
operate with a single +5V supply. The MAX1087/MAX1089
operate with a single +3V supply. The devices feature a
successive-approximation ADC, automatic shutdown,
fast wake-up (1.4µs), and a high-speed 3-wire inter-
face. Power consumption is only 0.5mW (V
DD
= +2.7V)
at the maximum sampling rate of 150ksps.
AutoShutdown™ (0.1µA) between conversions results in
reduced power consumption at slower throughput rates.
The MAX1086/MAX1087 provide 2-channel, single-
ended operation and accept input signals from 0 to
V
REF
. The MAX1088/MAX1089 accept true-differential
inputs ranging from 0 to V
REF
. Data is accessed using
an external clock through the 3-wire SPI™, QSPI™, and
MICROWIRE™-compatible serial interface. Excellent
dynamic performance, low-power, ease of use, and
small package size, make these converters ideal for
portable battery-powered data acquisition applications,
and for other applications that demand low power con-
sumption and minimal space.
Features
o
Single-Supply Operation
+3V (MAX1087/MAX1089)
+5V (MAX1086/MAX1088)
o
AutoShutdown Between Conversions
o
Low Power
200µA at 150ksps
130µA at 100ksps
65µA at 50ksps
13µA at 10ksps
1.5µA at 1ksps
0.2µA in Shutdown
o
True-Differential Track/Hold, 150kHz Sampling Rate
o
Software-Configurable Unipolar/Bipolar
Conversion (MAX1088/MAX1089 only)
o
SPI, QSPI, MICROWIRE-Compatible Interface for
DSPs and Processors
o
Internal Conversion Clock
o
8-Pin SOT23 and 8-Pin TDFN Packages
MAX1086–MAX1089
Ordering Information
PART
MAX1086EKA-T
MAX1086ETA+T
MAX1087EKA-T
MAX1087ETA+T
MAX1088EKA-T
MAX1088ETA+T
MAX1089EKA-T
MAX1089ETA+T
TEMP
RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-
PACKAGE
8 SOT23
8 TDFN-EP*
8 SOT23
8 TDFN-EP*
8 SOT23
8 TDFN-EP*
8 SOT23
8 TDFN-EP*
TOP
MARK
AAEZ
AFQ
AAEV
AFM
AAFB
AFS
AAEX
AFO
Applications
Low Power Data Acquisition
Portable Temperature Monitors
Flowmeters
Touch Screens
AutoShutdown is a trademark of Maxim Integrated Products.
SPI and QSPI are trademarks of Motorola Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
*EP = Exposed pad.
+Denotes
a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
Pin Configurations
CONVST
6
3
AIN2
DOUT
TOP VIEW
SCLK
8
V
DD
AIN1 (AIN+)
AIN2 (AIN-)
1
2
3
8
7
SCLK
DOUT
CNVST
REF
7
GND
4
MAX1086
MAX1087
MAX1088
MAX1089
SOT23
6
5
MAX1086–
MAX1089
+
1
V
DD
2
AIN1
4
GND
( ) ARE FOR THE MAX1088/MAX1089
TDFN
________________________________________________________________
Maxim Integrated Products
REF
5
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.
150ksps, 10-Bit, 2-Channel Single-Ended, and
1-Channel True-Differential ADCs in SOT23 and TDFN
MAX1086–MAX1089
ABSOLUTE MAXIMUM RATINGS
V
DD
to GND .............................................................-0.3V to +6V
CNVST, SCLK, DOUT to GND......................-0.3V to (V
DD
+0.3V)
REF, AIN1(AIN+), AIN2(AIN-) to GND..........-0.3V to (V
DD
+0.3V)
Maximum Current Into Any Pin ...........................................50mA
Continuous Power Dissipation (T
A
= +70°C)
8-Pin SOT23 (derate 9.70mW/°C above T
A
= +70°C) ......777mW
8-Pin TDFN (derate 18.2mW/°C above T
A
= +70°C)...1454.5mW
Operating Temperature Ranges.........................-40°C to +85°C
Storage Temperature Range .............................-60°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow)
SOT23 ..........................................................................+240°C
TDFN ............................................................................+260°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, V
REF
= +2.5V for MAX1087/MAX1089, or V
DD
= +4.75V to +5.25V, V
REF
= +4.096V for MAX1086/MAX1088,
0.1µF capacitor at REF, f
SCLK
= 8MHz (50% duty cycle), AIN- = GND for MAX1088/MAX1089. T
A
= T
MIN
to T
MAX,
unless otherwise
noted. Typical values at T
A
= +25°C.)
PARAMETER
DC ACCURACY
(Note 1)
Resolution
Relative Accuracy (Note 2)
Differential Nonlinearity
Offset Error
Gain Error (Note 3)
Gain Temperature Coefficient
Channel-to-Channel Offset
Channel-to-Channel Gain Matching
Input Common-Mode Rejection
CMR
V
CM
= 0V to V
DD
; zero scale input
INL
DNL
No missing codes over temperature
±0.5
±1.0
±0.8
±0.1
±0.1
±0.1
10
±1.0
±1.0
±1.0
±2.0
Bits
LSB
LSB
LSB
LSB
ppm/°C
LSB
LSB
mV
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DYNAMIC SPECIFICATIONS:
(f
IN
(sine-wave) = 10kHz, V
IN
= 4.096Vp-p for MAX1086/MAX1088 or V
IN
= 2.5V
PP
for MAX1087/MAX1089, 150ksps, f
SCLK
= 8MHz, AIN- = GND for MAX1088/MAX1089)
Signal to Noise Plus Distortion
Total Harmonic Distortion
(up to the 5
th
harmonic)
Spurious-Free Dynamic Range
Full-Power Bandwidth
Full-Linear Bandwidth
CONVERSION RATE
Conversion Time
T/H Acquisition Time
Aperture Delay
Aperture Jitter
Maximum Serial Clock Frequency
Duty Cycle
f
SCLK
8
30
70
t
CONV
t
ACQ
30
<50
3.7
1.4
µs
µs
ns
ps
MHz
%
SINAD
THD
SFDR
-3dB point
SINAD > 56dB
61
-70
70
1
100
dB
dB
dB
MHz
kHz
2
_______________________________________________________________________________________
150ksps, 10-Bit, 2-Channel Single-Ended, and
1-Channel True-Differential ADCs in SOT23 and TDFN
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +2.7V to +3.6V, V
REF
= +2.5V for MAX1087/MAX1089, or V
DD
= +4.75V to +5.25V, V
REF
= +4.096V for MAX1086/MAX1088,
0.1µF capacitor at REF, f
SCLK
= 8MHz (50% duty cycle), AIN- = GND for MAX1088/MAX1089. T
A
= T
MIN
to T
MAX,
unless otherwise
noted. Typical values at T
A
= +25°C.)
PARAMETER
ANALOG INPUT
Input Voltage Range (Note 4)
Input Leakage Current
Input Capacitance
EXTERNAL REFERENCE INPUT
Input Voltage Range
V
REF
V
REF
= +2.5V at 150ksps
Input Current
I
REF
V
REF
= +4.096V at 150ksps
Acquisition/Between conversions
DIGITAL INPUTS/OUTPUTS (SCLK, CNVST, DOUT)
Input Low Voltage
Input High Voltage
Input Leakage Current
Input Capacitance
Output Low Voltage
Output High Voltage
Three-State Leakage Current
Three-State Output Capacitance
POWER REQUIREMENTS
Positive Supply Voltage
V
DD
MAX1086/MAX1088
MAX1087/MAX1089
f
SAMPLE
=150ksps
V
DD
= +3V
f
SAMPLE
=100ksps
f
SAMPLE
=10ksps
f
SAMPLE
=1ksps
Positive Supply Current
I
DD
V
DD
= +5V
f
SAMPLE
=150ksps
f
SAMPLE
=100ksps
f
SAMPLE
=10ksps
f
SAMPLE
=1ksps
Shutdown
Positive Supply Rejection
PSR
V
DD
= 5V
±5%;
full-scale input
V
DD
= +2.7V to +3.6V; full-scale input
4.75
2.7
5.0
3.0
245
150
15
2
320
215
22
2.5
0.2
±0.1
±0.1
5
1.0
±1.2
mV
400
µA
5.25
3.6
350
V
C
OUT
V
IL
V
IH
I
L
C
IN
V
OL
V
OH
I
SINK
= 2mA
I
SINK
= 4mA
I
SOURCE
= 1.5mA
CNVST = GND
CNVST = GND
15
V
DD
-0.5
±10
15
0.4
0.8
V
DD
-1
±0.1
0.8
V
V
µA
pF
V
V
V
µA
pF
1.0
16
26
±0.01
V
DD
+50mV
30
45
±1
µA
V
Unipolar
Bipolar
Channel not selected or conversion stopped
0
-V
REF
/2
±0.01
34
V
REF
V
REF
/2
±1
V
µA
pF
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX1086–MAX1089
_______________________________________________________________________________________
3
150ksps, 10-Bit, 2-Channel Single-Ended, and
1-Channel True-Differential ADCs in SOT23 and TDFN
MAX1086–MAX1089
TIMING CHARACTERISTICS (Figures 1 and 2)
(V
DD
= +2.7V to +3.6V, V
REF
= +2.5V for MAX1087/MAX1089, or V
DD
= +4.75V to +5.25V, V
REF
= +4.096V for MAX1086/MAX1088,
0.1µF capacitor at REF, f
SCLK
= 8MHz (50% duty cycle); AIN- = GND for MAX1088/MAX1089. T
A
= T
MIN
to T
MAX,
unless otherwise
noted. Typical values at T
A
= +25°C.)
PARAMETERS
SCLK Pulse Width High
SCLK Pulse Width Low
SCLK Fall to DOUT Transition
SCLK Rise to DOUT Disable
CNVST Rise to DOUT Enable
CNVST Fall to MSB Valid
CNVST Pulse Width
SYMBOL
t
CH
t
CL
t
DOT
t
DOD
t
DOE
t
DOV
t
CSW
C
LOAD
= 30pF
C
LOAD
= 30pF
C
LOAD
= 30pF
C
LOAD
= 30pF
30
100
CONDITIONS
MIN
38
38
60
500
80
3.7
TYP
MAX
UNITS
ns
ns
ns
ns
ns
μs
ns
Note 1:
Unipolar input.
Note 2:
Relative accuracy is the deviation of the analog value at any code from its theoretical value after offset and gain errors have
been removed.
Note 3:
Offset nulled.
Note 4:
The absolute input range for the analog inputs is from GND to V
DD
.
CNVST
•••
t
CH
t
CL
SCLK
•••
t
CSW
t
DOE
DOUT
HIGH-Z
•••
t
DOT
t
DOD
HIGH-Z
Figure 1. Detailed Serial-Interface Timing Sequence
V
DD
6kΩ
DOUT
6kΩ
GND
DOUT
C
L
C
L
GND
a) HIGH -Z TO V
OH
, V
OL
TO V
OH
, AND V
OH
TO HIGH -Z
a) HIGH -Z TO V
OL
, V
OH
TO V
OL
, AND V
OL
TO HIGH -Z
Figure 2. Load Circuits for Enable/Disable Times
4
_______________________________________________________________________________________
150ksps, 10-Bit, 2-Channel Single-Ended, and
1-Channel True-Differential ADCs in SOT23 and TDFN
Typical Operating Characteristics
(V
DD
= +3.0V, V
REF
= +2.5V for MAX1087/MAX1089 or V
DD
= +5.0V, V
REF
= +4.096V for MAX1086/MAX1088, 0.1µF capacitor at
REF, f
SCLK
= 8MHz, (50% Duty Cycle), AIN- = GND for MAX1088/1089, T
A
= +25°C, unless otherwise noted.)
INTEGRAL NONLINEARITY
vs. OUTPUT CODE
MAX1086-9 toc01
MAX1086–MAX1089
INTEGRAL NONLINEARITY
vs. OUTPUT CODE
MAX1086-9 toc02
DIFFERENTIAL NONLINEARITY
vs. OUTPUT CODE
MAX1087/MAX1089
0.8
0.6
0.4
DNL (LSB)
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
MAX1086-9 toc03
MAX1086-9 toc06
1.0
0.8
0.6
0.4
INL (LSB)
MAX1087/MAX1089
1.0
0.8
0.6
0.4
INL (LSB)
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
MAX1086/MAX1088
1.0
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
0
200
400
600
800
1000
1200
OUTPUT CODE
0
200
400
600
800
1000
1200
0
200
400
600
800
1000
1200
OUTPUT CODE
OUTPUT CODE
DIFFERENTIAL NONLINEARITY
vs. OUTPUT CODE
MAX1086-9 toc04
SUPPLY CURRENT
vs. SAMPLING RATE
MAX1087/MAX1089
MAX1086-9 toc05
SUPPLY CURRENT
vs. SAMPLING RATE
1000
MAX1086/MAX1088
1.0
0.8
0.6
0.4
DNL (LSB)
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
0
200
400
600
MAX1086/MAX1088
1000
SUPPLY CURRENT (μA)
SUPPLY CURRENT (μA)
100
100
10
10
1
1
800
1000
1200
0.1
0.001
1.0
10
1000
0.1
0.001
1.0
10
1000
OUTPUT CODE
SAMPLING RATE (ksps)
SAMPLING RATE (ksps)
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
380
SUPPLY CURRENT (
μA)
MAX1086-9 toc07
SHUTDOWN CURRENT
vs. SUPPLY VOLTAGE
0.45
SHUTDOWN CURRENT (nA)
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
MAX1086-9 toc08
0.50
330
280
230
180
2.7
3.2
3.7
4.2
4.7
5.2
V
DD
(V)
0
2.7
3.2
3.7
4.2
4.7
5.2
V
DD
(V)
_______________________________________________________________________________________
5
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