General Description
The MAX1392/MAX1395 micropower, serial-output,
10-bit, analog-to-digital converters (ADCs) operate with
a single power supply from +1.5V to +3.6V. These
ADCs feature automatic shutdown, fast wake-up, and a
high-speed 3-wire interface. Power consumption is only
0.740mW (V
DD
= +1.5V) at the maximum conversion
rate of 357ksps. AutoShutdownTM between conversions
reduces power consumption at slower throughput rates.
The MAX1392/MAX1395 require an external reference
V
REF
that has a wide range from 0.6V to V
DD
. The
MAX1392 provides one true-differential analog input
that accepts signals ranging from 0 to V
REF
(unipolar
mode) or V
REF
/2 (bipolar mode). The MAX1395 pro-
vides two single-ended inputs that accept signals rang-
ing from 0 to V
REF
. Analog conversion results are
available through a 5MHz, 3-wire SPITM-/QSPITM-
/MICROWIRETM-/digital signal processor (DSP)-compat-
ible serial interface. Excellent dynamic performance,
low voltage, low power, ease of use, and small pack-
age sizes make these converters ideal for portable bat-
tery-powered data-acquisition applications, and for
other applications that demand low power consumption
and minimal space.
The MAX1392/MAX1395 are available in a space-sav-
ing (3mm x 3mm) 10-pin TDFN package or 10-pin
MAX
package. The parts operate over the extended
(-40C to +85C) and military (-55C to +125C) tem-
perature ranges.
Applications
Portable Datalogging
Data Acquisition
Medical Instruments
Battery-Powered Instruments
Process Control
Features
357ksps 10-Bit Successive-Approximation
Register (SAR) ADCs
Single True-Differential Analog Input Channel
with Unipolar-/Bipolar-Selected Input (MAX1392)
Dual Single-Ended Input Channel with Channel-
Selected Input (MAX1395)
0.5 LSB INL, 0.5 LSB DNL, No Missing Codes
1 LSB Total Unadjusted Error
61dB SINAD at 85kHz Input Frequency
Single Supply Voltage (+1.5V to +3.6V)
0.945mW at 350ksps, 1.8V
0.27mW at 100ksps, 1.8V
3.1W at 1ksps, 1.8V
<1A Shutdown Current
External Reference (0.6V to V
DD
)
AutoShutdown Between Conversions
SPI-/QSPI-/MICROWIRE-/DSP-Compatible,
3- or 4-Wire Serial Interface
Small (3mm x 3mm), 10-Pin TDFN or MAX
(3mm x 5mm) Package
MAX1392/MAX1395
1.5V to 3.6V, 357ksps, 1-Channel True-Differential/
2-Channel Single-Ended, 10-Bit, SAR ADCs
________________________________________________________________ Maxim Integrated Products
1
Ordering Information
19-3709; Rev 0; 5/05
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
PART
TEMP RANGE
PIN-PACKAGE
ANALOG INPUTS
TOP MARK
MAX1392ETB**
-40C to +85C
10 TDFN-EP*
1-CH DIFF
AOY
MAX1392EUB**
-40C to +85C
10 MAX
1-CH DIFF
--
MAX1392MTB**
-55C to +125C
10 TDFN-EP*
1-CH DIFF
--
MAX1392MUB**
-55C to +125C
10 MAX
1-CH DIFF
--
MAX1395ETB
-40C to +85C
10 TDFN-EP*
2-CH S/E
APB
MAX1395EUB**
-40C to +85C
10 MAX
2-CH S/E
--
MAX1395MTB**
-55C to +125C
10 TDFN-EP*
2-CH S/E
--
MAX1395MUB**
-55C to +125C
10 MAX
2-CH S/E
--
AutoShutdown is a trademark of Maxim Integrated Products, Inc.
SPI/QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
MAX is a registered trademark of Maxim Integrated Products, Inc.
Typical Operating Circuit and Pin Configurations appear at
end of data sheet.
*EP = Exposed pad.
**Future product--contact factory for availability.
MAX1392/MAX1395
2
_______________________________________________________________________________________
1.5V to 3.6V, 357ksps, 1-Channel True-Differential/
2-Channel Single-Ended, 10-Bit, SAR ADCs
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
DD
= +1.5V to +3.6V, V
REF
= V
DD
, C
REF
= 0.1F, f
SCLK
= 5MHz, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at
T
A
= +25C.)
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.
V
DD
to GND ..............................................................-0.3V to +4V
SCLK, CS, OE, CH1/CH2, UNI/BIP,
DOUT to GND.........................................-0.3V to (V
DD
+ 0.3V)
AIN+, AIN-, AIN1, AIN2, REF to GND ........-0.3V to (V
DD
+ 0.3V)
Maximum Current into Any Pin .........................................50mA
Continuous Power Dissipation (T
A
= +70C)
10-Pin TDFN (derate 18.5mW/C above +70C) ....1481.5mW
10-Pin MAX (derate 5.6mW/C above +70C) ........444.4mW
Operating Temperature Ranges
MAX139_E_ _...................................................-40C to +85C
MAX139_M_ _ ................................................-55C to +125C
Junction Temperature ......................................................+150C
Storage Temperature Range .............................-60C to +150C
Lead Temperature (soldering, 10s) .................................+300C
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DC ACCURACY (Note 1)
Resolution
10
Bits
Integral Nonlinearity
INL
0.5
LSB
Differential Nonlinearity
DNL
No missing code overtemperature
0.5
LSB
Offset Error
0.25
0.5
LSB
Gain Error
Offset nulled
0.25
0.5
LSB
Total Unadjusted Error
TUE
1
LSB
Offset-Error Temperature
Coefficient
0.001
LSB/C
Gain-Error Temperature
Coefficient
0.00025
LSB/C
Channel-to-Channel Offset
Matching
MAX1395 only
0.1
LSB
Channel-to-Channel Gain
Matching
MAX1395 only
0.1
LSB
Input Common-Mode Rejection
CMR
V
CM
= 0 to V
DD
, MAX1392 only
0.1
mV/V
DYNAMIC SPECIFICATIONS (Note 2)
Signal-to-Noise Plus Distortion
SINAD
V
REF
= V
DD
= 1.6 to 3.6V
61
dB
Signal-to-Noise Ratio
SNR
V
REF
= V
DD
= 1.6 to 3.6V
61
dB
Total Harmonic Distortion
THD
-83
-73
dBc
Spurious-Free Dynamic Range
SFDR
-84
-74
dBc
Intermodulation Distortion
IMD
f
IN1
= 83kHz at -6.5dBFS,
f
IN2
= 87kHz at -6.5dBFS
-75
dB
Channel-to-Channel Crosstalk
MAX1395 only
-70
dB
Full-Power Bandwidth
-3dB point
4
MHz
MAX1392
200
Full-Linear Bandwidth
SINAD > 59dB
MAX1395
150
kHz
MAX1392/MAX1395
_______________________________________________________________________________________
3
1.5V to 3.6V, 357ksps, 1-Channel True-Differential/
2-Channel Single-Ended, 10-Bit, SAR ADCs
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +1.5V to +3.6V, V
REF
= V
DD
, C
REF
= 0.1F, f
SCLK
= 5MHz, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at
T
A
= +25C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
CONVERSION RATE
Conversion Time
t
CONV
11 clock cycles
2.2
s
Throughput Rate
14 clocks per conversion; includes power-
up, acquisition, and conversion time
357
ksps
Power-Up and Acquisition Time
t
ACQ
Three SCLK cycles
600
ns
Aperture Delay
t
AD
8
ns
Aperture Jitter
t
AJ
30
ps
Serial Clock Frequency
f
CLK
0.1
5.0
MHz
ANALOG INPUTS (AIN+, AIN-, AIN1, AIN2)
Unipolar
0
V
REF
Input Voltage Range
V
IN
Bipolar, MAX1392 only (AIN+ - AIN-)
-V
REF
/2
+V
REF
/2
V
Common-Mode Input Voltage
Range
V
CM
Bipolar, MAX1392 only [(AIN+) + (AIN-)] / 2
0
V
DD
V
Input Leakage Current
Channel not selected, or conversion
stopped, or in shutdown mode
1
A
Input Capacitance
16
pF
REFERENCE INPUT (REF)
REF Input Voltage Range
V
REF
0.6
V
DD
+
0.05
V
REF Input Capacitance
24
pF
REF DC Leakage Current
0.025
2.5
A
REF Input Dynamic Current
357ksps
20
60
A
DIGITAL INPUTS (SCLK, CS, OE, CH1/CH2, UNI/BIP)
Input-Voltage Low
V
IL
0.3 x
V
DD
V
Input-Voltage High
V
IH
0.7 x
V
DD
V
Input Hysteresis
0.06 x
V
DD
V
Input Leakage Current
I
IL
Inputs at GND or V
DD
1
A
CS, OE
1
Input Capacitance
C
IN
CH1/CH2, UNI/BIP
12.5
pF
DIGITAL OUTPUT (DOUT)
Output-Voltage Low
V
OL
I
SINK
= 2mA
0.1 x
V
DD
V
Output-Voltage High
V
OH
I
SOURCE
= 2mA
0.9 x
V
DD
V
MAX1392/MAX1395
4
_______________________________________________________________________________________
1.5V to 3.6V, 357ksps, 1-Channel True-Differential/
2-Channel Single-Ended, 10-Bit, SAR ADCs
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +1.5V to +3.6V, V
REF
= V
DD
, C
REF
= 0.1F, f
SCLK
= 5MHz, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at
T
A
= +25C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Tri-State Leakage Current
I
LT
OE = V
DD
1
A
Tri-State Output Capacitance
C
OUT
OE = V
DD
10
pF
POWER SUPPLY
Positive Supply Voltage
V
DD
1.5
3.6
V
V
DD
= 1.6V
150
140
f
SAMPLE
= 100ksps
V
DD
= 3V
200
225
V
DD
= 1.6V
520
600
f
SAMPLE
= 357ksps
V
DD
= 3V
710
800
Power-down mode (Note 4)
5
10
Positive Supply Current (Note 3)
I
DD
Power-down mode (Note 5)
0.2
2.5
A
Power-Supply Rejection
(Note 6)
PSR
V
DD
= 1.5V to 3.6V, full-scale input
150
1000
V/V
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
SCLK Clock Period
t
CP
200
10000
ns
SCLK Pulse-Width High
t
CH
90
ns
SCLK Pulse-Width Low
t
CL
90
ns
CS Fall to SCLK Rise Setup
t
CSS
80
ns
SCLK Rise to CS Fall Ignore
t
CSO
0
ns
SCLK Fall to DOUT Valid
t
DOV
C
LOAD
= 0 to 30pF
10
80
ns
OE Rise to DOUT Disable
t
DOD
6
20
ns
OE Fall to DOUT Enable
t
DOE
9
20
ns
CS Pulse-Width High or Low
t
CSW
80
ns
OE Pulse-Width High or Low
t
OEW
80
ns
CH1/CH2 Setup Time (to the First SCLK)
t
CHS
MAX1395 only
10
ns
CH1/CH2 Hold Time (to the First SCLK)
t
CHH
MAX1395 only
0
ns
UNI/BIP Setup Time (to the First SCLK)
t
UBS
MAX1392 only
10
ns
UNI/BIP Hold Time (to the First SCLK)
t
UBH
MAX1392 only
0
ns
Note 1: V
DD
= 1.5V, V
REF
= 1.5V, and V
AIN
= 1.5V.
Note 2: V
DD
= 1.5V, V
REF
= 1.5V, V
AIN
= 1.5V
P-P
, f
SCLK
= 5MHz, f
SAMPLE
= 357ksps, and f
IN
(sine-wave) = 85kHz.
Note 3: All digital inputs swing between V
DD
and GND. V
REF
= V
DD
, f
IN
= 85kHz sine-wave, V
AIN
= V
REFP-P,
C
LOAD
= 30pF on DOUT.
Note 4: CS = V
DD
, OE = UNI/BIP = CH1/CH2 = V
DD
or GND, SCLK is active.
Note 5: CS = V
DD
, OE = UNI/BIP = CH1/CH2 = V
DD
or GND, SCLK is inactive.
Note 6: Change in V
AIN
at code boundary 1022.5.
TIMING CHARACTERISTICS
(V
DD
= +1.5V to +3.6V, V
REF
= V
DD
, C
REF
= 0.1F, f
SCLK
= 5MHz, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at
T
A
= +25C.) (Figure 1)
MAX1392/MAX1395
_______________________________________________________________________________________
5
1.5V to 3.6V, 357ksps, 1-Channel True-Differential/
2-Channel Single-Ended, 10-Bit, SAR ADCs
CS
SCLK
DOUT
OE
UNI/BIP OR
CH1/CH2
t
UBS
t
CHS
t
UBH
t
CHH
t
CSO
t
CSS
t
CL
t
CH
t
CP
t
DOE
HIGH-Z
t
DOV
t
OEW
t
CSW
t
DOD
HIGH-Z
Figure 1. Detailed Serial-Interface Timing Diagram
GND
50pF
50pF
DOUT
DOUT
GND
V
DD
a) HIGH IMPEDANCE TO V
OH
,
V
OL
TO V
OH
,
AND V
OH
TO HIGH IMPEDANCE
b) HIGH IMPEDANCE TO V
OL
,
V
OH
TO V
OL
,
AND V
OL
TO HIGH IMPEDANCE
10mA
10mA
Figure 2. Load Circuits for Enable/Disable Times
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