19-1432; Rev 0; 3/99
Single-Supply, Low-Power,
Serial 8-Bit ADCs
General Description
The MAX1106/MAX1107 low-power, 8-bit, single-channel,
analog-to-digital converters (ADCs) feature an internal
track/hold (T/H), voltage reference, clock, and serial inter-
face. The MAX1106 is specified from +2.7V to +3.6V and
consumes only 96µA. The MAX1107 is specified from
+4.5V to +5.5V and consumes only 107µA. The analog
inputs are pin-configurable, allowing unipolar and single-
ended or differential operation.
The full-scale analog input range is determined by the
internal reference of +2.048V (MAX1106) or +4.096V
(MAX1107), or by an externally applied reference rang-
ing from 1V to V
DD
. The MAX1106/MAX1107 also feature
a pin-selectable power-down mode that reduces power
consumption to 0.5µA 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 25ksps are performed using the inter-
nal clock.
The MAX1106/MAX1107 are available in a 10-pin µMAX
package with a footprint that is just 20% of an
8-pin plastic DIP.
Features
o
Single Supply: +2.7V to +3.6V (MAX1106)
+4.5V to +5.5V (MAX1107)
o
Low Power: 96µA at +3V and 25ksps
0.5µA in Power-Down Mode
o
Pin-Programmable Configuration
o
0 to V
DD
Input Voltage Range
o
Internal Track/Hold
o
Internal Reference: +2.048V (MAX1106)
+4.096V (MAX1107)
o
1V to V
DD
Reference Input Range
o
SPI/QSPI/MICROWIRE-Compatible Serial Interface
o
Small 10-Pin µMAX Package
MAX1106/MAX1107
Ordering Information
PART
MAX1106CUB
MAX1106EUB
MAX1107CUB
MAX1107EUB
TEMP. RANGE
0°C to +70°C
-40°C to +85°C
0°C to +70°C
-40°C to +85°C
PIN-PACKAGE
10 µMAX
10 µMAX
10 µMAX
10 µMAX
Applications
Portable Data Logging
Hand-Held Measurement Devices
Medical Instruments
System Diagnostics
Solar-Powered Remote Systems
4–20mA-Powered Remote Systems
Receive-Signal-Strength Indicators
Functional Diagram
V
DD
CONVST
SCLK
OUTPUT
SHIFT
REGISTER
Pin Configuration
TOP VIEW
V
DD
1
IN+
IN-
GND
REFOUT
2
3
4
5
10
SCLK
9
DOUT
SHDN
CONVST
REFIN
SHDN
MAX1106
MAX1107
INTERNAL
OSCILLATOR
CONTROL
LOGIC
DOUT
MAX1106
MAX1107
8
7
6
IN+
IN-
REFOUT
ANALOG
INPUT
MUX
INTERNAL
REFERENCE
T/H
CHARGE
REDISTRIBUTION
DAC
SAR
µMAX
REFIN
GND
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.
Single-Supply, Low-Power,
Serial 8-Bit ADCs
MAX1106/MAX1107
ABSOLUTE MAXIMUM RATINGS
V
DD
to GND ..............................................................-0.3V to +6V
IN+, IN-, REFIN, REFOUT,
DOUT to GND..........................................-0.3V to (V
DD
+ 0.3V)
SHDN,
SCLK, CONVST to GND ...............................-0.3V to +6V
Continuous Power Dissipation (T
A
= +70°C)
10-pin µMAX (derate 5.6mW/°C above +70°C) ............444mW
Operating Temperature Ranges
MAX110_CUB ......................................................0°C to +70°C
MAX110_EUB ...................................................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°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—MAX1106
(V
DD
= +2.7V to +3.6V; IN- to GND; f
SCLK
= 2MHz; 25ksps conversion rate; 1µF capacitor at REFOUT; external +2.048V reference at
REFIN; T
A
= T
MIN
to T
MAX
; unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
DC ACCURACY
Resolution
Relative Accuracy (Note 1)
Differential Nonlinearity
Offset Error
Gain Error (Note 3)
Gain Temperature Coefficient
Total Unadjusted Error
TUE
T
A
= +25°C
T
A
= T
MIN
to T
MAX
±0.5
49
-70
68
-3dB rolloff
1.5
0.8
V
IN_
V
IN+
to V
IN-
On/off-leakage current,
V
IN+
or V
IN-
= 0 or V
DD
C
IN
0
±0.01
18
V
REFIN
±1
±0.8
±1
INL
DNL
V
DD
= 2.7V to 3.6V
V
DD
= 5.5V (Note 2)
No missing codes over temperature
V
DD
= 2.7V to 3.6V
V
DD
= 5.5V (Note 2)
±0.2
±0.5
±1
8
±0.15
±0.2
±1
±1
±0.5
Bits
LSB
LSB
LSB
LSB
ppm/°C
LSB
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DYNAMIC PERFORMANCE
(10kHz sine-wave input, 2.048Vp-p, 25ksps conversion rate)
Signal-to-Noise Plus Distortion
Total Harmonic Distortion
(up to the 5th harmonic)
Spurious-Free Dynamic Range
Small-Signal Bandwidth
Full-Power Bandwidth
ANALOG INPUTS
Input Voltage Range (Note 4)
Input Leakage Current
Input Capacitance
V
µA
pF
SINAD
THD
SFDR
BW
-3dB
dB
dB
dB
MHz
MHz
2
_______________________________________________________________________________________
Single-Supply, Low-Power,
Serial 8-Bit ADCs
ELECTRICAL CHARACTERISTICS—MAX1106 (continued)
(V
DD
= +2.7V to +3.6V; IN- to GND; f
SCLK
= 2MHz; 25ksps conversion rate; 1µF capacitor at REFOUT; external +2.048V reference at
REFIN; T
A
= T
MIN
to T
MAX
; unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
TRACK/HOLD
Conversion Time
Track/Hold Acquisition Time
Aperture Delay
Aperture Jitter
Internal Clock Frequency
External Clock Frequency Range
INTERNAL REFERENCE
Output Voltage
REF Short-Circuit Current
REF Tempco
Load Regulation
Capacitive Bypass at REFOUT
EXTERNAL REFERENCE
Input Voltage Range
Input Current
POWER REQUIREMENTS
Supply Voltage
V
DD
V
DD
= 3.6V, C
L
= 10pF
Supply Current (Notes 2, 7)
I
DD
V
DD
= 5.5V, C
L
= 10pF
Power down, V
DD
= 3.6V
Power-Supply Rejection (Note 8)
PSR
Full-scale input, V
DD
= 2.7V to 3.6V
V
DD
≤
3.6V
V
DD
> 3.6V
0.8
0.2
±1
±1
15
DIGITAL INPUTS
(SHDN, SCLK, and CONVST)
Threshold Voltage High
Threshold Voltage Low
Input Hysteresis
Input Current High
Input Current Low
Input Capacitance
V
IH
V
IL
V
HYST
I
IH
I
IL
C
IN
2
3
V
V
V
V
µA
µA
pF
2.7
3
96
115
0.5
±0.4
2.5
±4
mV
5.5
250
µA
V
V
REFIN
+2.048V at REFIN, full scale
1.0
1
V
DD
+ 0.05
20
V
µA
0 to 0.5mA (Note 6)
1
V
REFOUT
I
REFSC
(Note 5)
1.968
2.048
150
±50
4
2.128
V
µA
ppm/°C
mV
µF
For data transfer only
t
CONV
t
ACQ
Figure 7
1
10
<50
400
2
35
µs
µs
ns
ps
kHz
MHz
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX1106/MAX1107
_______________________________________________________________________________________
3
Single-Supply, Low-Power,
Serial 8-Bit ADCs
MAX1106/MAX1107
ELECTRICAL CHARACTERISTICS—MAX1106 (continued)
(V
DD
= +2.7V to +3.6V; IN- to GND; f
SCLK
= 2MHz; 25ksps conversion rate; 1µF capacitor at REFOUT; external +2.048V reference at
REFIN; T
A
= T
MIN
to T
MAX
; unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
DIGITAL OUTPUT
(DOUT)
Output High Voltage
Output Low Voltage
Three-State Leakage Current
Three-State Output Capacitance
Acquisition Time
CONVST Pulse Width High
CONVST Fall to Output Data
Valid
CONVST Rise to Output Enable
SCLK Fall to Output Data Valid
SCLK Pulse Width High
SCLK Pulse Width Low
SCLK Low to Output Disable
SCLK Low to CONVST Rise
SHDN
Fall to Output Disable
Wake-Up Time
V
OH
V
OL
I
L
C
OUT
t
ACQ
t
CSPW
t
CONV
t
DV
t
DO
t
CH
t
CL
t
TR
t
SCC
t
SHDN
t
WAKE
Figure 1, C
LOAD
= 100pF
Figure 1, C
LOAD
= 100pF
I
SOURCE
= 0.5mA
I
SINK
= 5mA
I
SINK
= 16mA
Figure 6, DOUT High-Z
Figure 6, DOUT High-Z
1
1
35
240
200
0.8
±0.01
15
±10
V
DD
- 0.5
0.4
V
V
V
µA
pF
µs
µs
µs
ns
ns
ns
ns
ns
ns
ns
µs
ms
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
TIMING CHARACTERISTICS
(Figures 6 and 7)
20
200
200
100
Figure 2, C
LOAD
= 100pF
Figure 2, C
LOAD
= 100pF
External reference
Internal reference (Note 9)
240
240
20
12
4
_______________________________________________________________________________________
Single-Supply, Low-Power,
Serial 8-Bit ADCs
ELECTRICAL CHARACTERISTICS—MAX1107
(V
DD
= +4.5V to +5.5V; IN- = GND; f
SCLK
= 2MHz; 25ksps conversion rate; 1µF capacitor at REFOUT; external +4.096V reference at
REFIN; T
A
= T
MIN
to T
MAX
; unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
DC ACCURACY
Resolution
Relative Accuracy (Note 1)
Differential Nonlinearity
Offset Error
Gain Error (Note 3)
Gain Temperature Coefficient
Total Unadjusted Error
TUE
T
A
= +25°C
T
A
= T
MIN
to T
MAX
±0.5
49
-70
68
-3dB rolloff
1.5
0.8
V
IN_
V
IN+
to V
IN-
On/off-leakage current,
V
IN+
or V
IN-
= 0 or V
DD
C
IN
t
CONV
t
ACQ
Figure 7
1
10
<50
400
For data transfer only
V
REFOUT
I
REFSC
0 to 0.5mA (Note 6)
1
3.936
4.096
5
±50
4
2
4.256
0
±0.01
18
35
V
REFIN
±1
±0.8
±1
INL
DNL
No missing codes over temperature
±0.2
8
±0.15
±0.5
±1
±1
±1
Bits
LSB
LSB
LSB
LSB
ppm/°C
LSB
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX1106/MAX1107
DYNAMIC PERFORMANCE
(10kHz sine-wave input, 4.096Vp-p, 25ksps conversion rate)
Signal-to-Noise Plus Distortion
Total Harmonic Distortion
(up to the 5th harmonic)
Spurious-Free Dynamic Range
Small-Signal Bandwidth
Full-Power Bandwidth
ANALOG INPUTS
Input Voltage Range (Note 4)
Input Leakage Current
Input Capacitance
TRACK/HOLD
Conversion Time
Track/Hold Acquisition Time
Aperture Delay
Aperture Jitter
Internal Clock Frequency
External Clock Frequency Range
INTERNAL REFERENCE
Output Voltage
REF Short-Circuit Current
REF Tempco
Load Regulation
Capacitive Bypass at REFOUT
V
mA
ppm/°C
mV
µF
µs
µs
ns
ps
kHz
MHz
V
µA
pF
SINAD
THD
SFDR
BW
-3dB
dB
dB
dB
MHz
MHz
_______________________________________________________________________________________
5
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