19-2955; Rev 1; 8/07
Multichannel, 14-Bit, 200ksps Analog-to-Digital
Converters
General Description
The MAX1067/MAX1068 low-power, multichannel, 14-
bit analog-to-digital converters (ADCs) feature a suc-
cessive-approximation ADC, integrated +4.096V
reference, a reference buffer, an internal oscillator,
automatic power-down, and a high-speed SPI™/
QSPI™/MICROWIRE™-compatible interface. The
MAX1067/MAX1068 operate with a single +5V analog
supply and feature a separate digital supply, allowing
direct interfacing with +2.7V to +5.5V digital logic.
The MAX1067/MAX1068 consume only 3.6mA (AV
DD
=
DV
DD
= +5V) at 200ksps when using an external refer-
ence. AutoShutdown™ reduces the supply current to
185µA at 10ksps and to less than 10µA at reduced sam-
pling rates.
The MAX1067 includes a 4-channel input multiplexer, and
the MAX1068 accepts up to eight analog inputs.
In addition, digital signal processor (DSP)-initiated con-
versions are simplified with the DSP frame-sync input and
output featured in the MAX1068. The MAX1068 includes a
data-bit transfer input to select between 8-bit-wide or 16-
bit-wide data-transfer modes. Both devices feature a scan
mode that converts each channel sequentially or one
channel continuously.
Excellent dynamic performance and low power, com-
bined with ease of use and an integrated reference,
make the MAX1067/MAX1068 ideal for control and data-
acquisition operations or for other applications with
demanding power consumption and space require-
ments. The MAX1067 is available in a 16-pin QSOP
package, and the MAX1068 is available in a 24-pin
QSOP package. Both devices are guaranteed over the
commercial (0°C to +70°C) and extended (-40°C to
+85°C) temperature ranges. Use the MAX1168 evalua-
tion kit to evaluate the MAX1068.
♦
14-Bit Resolution, ±0.5 LSB INL and
±1 LSB DNL (max)
♦
+5V Single-Supply Operation
♦
Adjustable Logic Level (+2.7V to +5.25V)
♦
Input Voltage Range: 0 to V
REF
♦
Internal (+4.096V) or External (+3.8V to AV
DD
)
Reference
♦
Internal Track/Hold, 4MHz Input Bandwidth
♦
Internal or External Clock
♦
SPI/QSPI/MICROWIRE-Compatible Serial
Interface, MAX1068 Performs DSP-Initiated
Conversions
♦
8-Bit-Wide or 16-Bit-Wide Data-Transfer Mode
(MAX1068 Only)
♦
4-Channel (MAX1067) or 8-Channel (MAX1068)
Input Mux
Scan Mode Sequentially Converts Multiple
Channels or One Channel Continuously
♦
Low Power
3.6mA at 200ksps
1.85mA at 100ksps
185µA at 10ksps
0.6µA in Full Power-Down Mode
♦
Small Package Size
16-Pin QSOP (MAX1067)
24-Pin QSOP (MAX1068)
Features
MAX1067/MAX1068
Applications
Motor Control
Industrial Process Control
Industrial I/O Modules
Data-Acquisition Systems
Thermocouple Measurements
Accelerometer Measurements
PART
MAX1067ACEE
MAX1067BCEE
MAX1067CCEE
MAX1067AEEE
MAX1067BEEE
MAX1067CEEE
Ordering Information
TEMP RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-
PACKAGE
16 QSOP
16 QSOP
16 QSOP
16 QSOP
16 QSOP
16 QSOP
INL
(LSB)
±0.5
±1
±2
±0.5
±1
±2
Ordering Information continued at end of data sheet.
SPI/QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
AutoShutdown is a trademark of Maxim Integrated Products, Inc.
________________________________________________________________
Maxim Integrated Products
1
Pin Configurations appear at end of data sheet.
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.
Multichannel, 14-Bit, 200ksps Analog-to-Digital
Converters
MAX1067/MAX1068
ABSOLUTE MAXIMUM RATINGS
AV
DD
to AGND .........................................................-0.3V to +6V
DV
DD
to DGND.........................................................-0.3V to +6V
DGND to AGND.....................................................-0.3V to +0.3V
AIN_, REF, REFCAP to AGND..................-0.3V to (AV
DD
+ 0.3V)
SCLK,
CS,
DSEL, DSPR, DIN to DGND ...................-0.3V to +6V
DOUT, DSPX,
EOC
to DGND...................-0.3V to (DV
DD
+ 0.3V)
Maximum Current into Any Pin............................................50mA
Continuous Power Dissipation (T
A
= +70°C)
16-Pin QSOP (derate 8.3mW/°C above +70°C)...........667mW
24-Pin QSOP (derate 9.5mW/°C above +70°C)...........762mW
Operating Temperature Ranges
MAX106_ _ CE_ ..................................................0°C to +70°C
MAX106_ _ EE_ ...............................................-40°C to +85°C
Maximum Junction Temperature .....................................+150°C
Storage Temperature Range .............................-65°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
(AV
DD
= DV
DD
= +4.75V to +5.25V, f
SCLK
= 4.8MHz external clock (50% duty cycle), 24 clocks/conversion (200ksps), external V
REF
= +4.096V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
DC ACCURACY
(Note 1)
Resolution
MAX106_A
Relative Accuracy (Note 2)
INL
MAX106_B
MAX106_C
MAX106_A
Differential Nonlinearity
DNL
No missing codes
over temperature
MAX106_B
MAX106_C
Transition Noise
Offset Error
Gain Error
Offset Drift
Gain Drift
Signal-to-Noise Plus Distortion
Signal-to-Noise Ratio
Total Harmonic Distortion
Spurious-Free Dynamic Range
Full-Power Bandwidth
Full-Linear Bandwidth
Channel-to-Channel Isolation
CONVERSION RATE
Conversion Time
t
CONV
Internal clock, no data transfer,
single conversion (Note 5)
External clock
5.52
3.75
7.07
µs
SINAD
SNR
THD
SFDR
-3dB point
SINAD > 81dB
(Note 4)
86
(Note 3)
81
82
DYNAMIC SPECIFICATIONS (1kHz sine wave, 4.096V
P-P
) (Note 1)
84
84
-98
99
4
10
85
-86
dB
dB
dB
dB
MHz
kHz
dB
(Note 3)
RMS noise
External reference
Internal reference
0.33
0.35
±0.1
±0.01
1
±1.2
±10
±0.2
14
±0.5
±1.0
±1.5
±1
±2
±3
±1
+1.5
-1.0
+1.5
-1.0
LSB
RMS
mV
%FSR
ppm/°C
ppm/°C
LSB
LSB
Bits
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
2
_______________________________________________________________________________________
Multichannel, 14-Bit, 200ksps Analog-to-Digital
Converters
ELECTRICAL CHARACTERISTICS (continued)
(AV
DD
= DV
DD
= +4.75V to +5.25V, f
SCLK
= 4.8MHz external clock (50% duty cycle), 24 clocks/conversion (200ksps), external V
REF
= +4.096V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
Acquisition Time
Serial Clock Frequency
Internal Clock Frequency
Aperture Delay
Aperture Jitter
SYMBOL
t
ACQ
f
SCLK
f
INTCLK
t
AD
t
AJ
8-bit-wide data-transfer mode
16-bit-wide data-transfer mode
Internal clock, single conversion, 8-bit-wide
data-transfer mode
Sample Rate (Note 7)
f
S
Internal clock, single conversion, 16-bit-
wide data-transfer mode
Internal clock, scan mode, 8-bit-wide data-
transfer mode (four conversions)
External clock, scan mode, 16-bit-wide
data-transfer mode (four conversions)
Duty Cycle
ANALOG INPUT (AIN_)
Input Range
Input Capacitance
EXTERNAL REFERENCE
Input Voltage Range
Input Current
INTERNAL REFERENCE
Reference Voltage
Reference Short-Circuit Current
Reference Temperature
Coefficient
Reference Wake-Up Time
t
RWAKE
V
REF
= 0
V
REFIN
I
REFSC
4.042
4.096
13
±25
5
4.136
V
mA
ppm/°C
ms
V
REF
I
REF
(Note 8)
V
AIN
_ = 0
SCLK idle
CS
= DV
DD
, SCLK idle
3.8
34
0.1
0.1
µA
AV
DD
– 0.2
V
V
AIN
_
C
AIN
_
0
45
V
REF
V
pF
45
4.17
3.125
89
68
103
82
55
%
ksps
(Note 6)
External clock, data transfer and conversion
External clock, data transfer only
Internal clock
3.2
4.0
15
<50
200.00
150.000
CONDITIONS
MIN
729
0.1
4.8
9
TYP
MAX
UNITS
ns
MHz
MHz
ns
ps
MAX1067/MAX1068
_______________________________________________________________________________________
3
Multichannel, 14-Bit, 200ksps Analog-to-Digital
Converters
MAX1067/MAX1068
ELECTRICAL CHARACTERISTICS (continued)
(AV
DD
= DV
DD
= +4.75V to +5.25V, f
SCLK
= 4.8MHz external clock (50% duty cycle), 24 clocks/conversion (200ksps), external V
REF
= +4.096V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
0.7
×
DV
DD
0.3
×
DV
DD
Digital inputs = 0 to DV
DD
±0.1
0.2
15
DV
DD
-
0.4
0.8
0.4
±0.1
15
4.75
2.70
200ksps
100ksps
Analog Supply Current (Note 9)
I
AVDD
10ksps
1ksps
External reference
Internal reference
External reference
Internal reference
External reference
Internal reference
External reference
Internal reference
200ksps
Digital Supply Current
I
DVDD
DOUT =
all zeros
100ksps
10ksps
1ksps
Internal reference and
reference buffer on
between conversions
Internal reference on,
reference buffer off
between conversions
2.7
3.6
1.4
2.7
0.14
1.8
0.014
1.7
0.87
0.45
0.045
0.005
0.66
mA
0.20
1.3
mA
mA
5.25
5.25
3.3
4.2
±10
±1
TYP
MAX
UNITS
DIGITAL INPUTS (SCLK,
CS,
DSEL, DSPR, DIN) (DV
DD
= +2.7V to +5.25V)
Input High Voltage
Input Low Voltage
Input Leakage Current
Input Hysteresis
Input Capacitance
V
IH
V
IL
I
IN
V
HYST
C
IN
V
V
µA
V
pF
DIGITAL OUTPUT (DOUT, DSPX,
EOC)
(DV
DD
= +2.7V to +5.25V)
Output High Voltage
Output Low Voltage
Tri-State Output Leakage Current
Tri-State Output Capacitance
POWER SUPPLIES
Analog Supply
Digital Supply
AV
DD
DV
DD
V
V
V
OH
V
OL
I
L
C
OUT
I
SOURCE
= 0.5mA
I
SINK
= 10mA, DV
DD
= +4.75V to +5.25V
I
SINK
= 1.6mA, DV
DD
= +2.7V to +5.25V
CS
= DV
DD
CS
= DV
DD
V
V
µA
pF
Power-Down Supply Current
I
AVDD
+
I
DVDD
CS
= DV
DD
,
SCLK = 0,
DIN = 0,
DSPR = DV
DD
4
_______________________________________________________________________________________
Multichannel, 14-Bit, 200ksps Analog-to-Digital
Converters
ELECTRICAL CHARACTERISTICS (continued)
(AV
DD
= DV
DD
= +4.75V to +5.25V, f
SCLK
= 4.8MHz external clock (50% duty cycle), 24 clocks/conversion (200ksps), external V
REF
= +4.096V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
Shutdown Supply Current
Power-Supply Rejection Ratio
SYMBOL
I
AVDD
+
I
DVDD
PSRR
CONDITIONS
CS
= DV
DD
, SCLK = 0, DIN = 0,
DSPR = DV
DD
, full power-down
AV
DD
= DV
DD
= 4.75V to 5.25V, full-scale
input (Note 10)
MIN
TYP
0.6
63
MAX
10
UNITS
µA
dB
MAX1067/MAX1068
TIMING CHARACTERISTICS (Figures 1, 2, 8, and 16)
(AV
DD
= DV
DD
= +4.75V to +5.25V,
f
SCLK
= 4.8MHz external clock (50% duty cycle), 24 clocks/conversion (200ksps), external V
REF
= +4.096V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
Acquisition Time
SCLK to DOUT Valid
CS
Fall to DOUT Enable
CS
Rise to DOUT Disable
CS
Pulse Width
CS
to SCLK Setup
CS
to SCLK Hold
SCLK High Pulse Width
SCLK Low Pulse Width
SCLK Period
DIN to SCLK Setup
DIN to SCLK Hold
CS
Falling to DSPR Rising
DSPR to SCLK Falling Setup
DSPR to SCLK Falling Hold
SYMBOL
t
ACQ
t
DO
t
DV
t
TR
t
CSW
t
CSS
t
CSH
t
CH
t
CL
t
CP
t
DS
t
DH
t
DF
t
FSS
t
FSH
SCLK rise
SCLK fall (DSP)
SCLK rise
SCLK fall (DSP)
SCLK rise
SCLK fall (DSP)
SCLK rise
SCLK fall (DSP)
Duty cycle 45% to 55%
Duty cycle 45% to 55%
Conversion
Data transfer
Conversion
Data transfer
C
DOUT
= 30pF
C
DOUT
= 30pF
C
DOUT
= 30pF
100
100
0
93
50
93
50
209
50
0
100
100
0
CONDITIONS
External clock (Note 6)
MIN
729
50
80
80
TYP
MAX
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
_______________________________________________________________________________________
5
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