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MAX144BEUA

Part # MAX144BEUA
Description +2.7V, LOW-POWER, 2-CHANNEL,108KSPS, SERIAL 12-BIT ADCS I
Category IC
Availability In Stock
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MAXIM
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Technical Document


DISCLAIMER: The information provided herein is solely for informational purposes. Customers must be aware of the suitability of this product for their application, and consider that variable factors such as Manufacturer, Product Category, Date Codes, Pictures and Descriptions may differ from available inventory.

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.
General Description
The MAX144/MAX145 low-power, 12-bit analog-to-
digital converters (ADCs) are available in 8-pin µMAX
and DIP packages. Both devices operate with a single
+2.7V to +5.25V supply and feature a 7.4µs succes-
sive-approximation ADC, automatic power-down, fast
wake-up (2.5µs), an on-chip clock, and a high-speed,
3-wire serial interface.
Power consumption is only 3.2mW (V
DD
= +3.6V) at the
maximum sampling rate of 108ksps. At slower through-
put rates, the automatic shutdown (0.2µA) further
reduces power consumption.
The MAX144 provides 2-channel, single-ended opera-
tion and accepts input signals from 0 to V
REF
. The
MAX145 accepts pseudo-differential inputs ranging
from 0 to V
REF
. An external clock accesses data-
through the 3-wire serial interface, which is SPI™,
QSPI™, and MICROWIRE™-compatible.
Excellent dynamic performance and low power, com-
bined with ease of use and small package size, make
these converters ideal for battery-powered and data-
acquisition applications, or for other circuits with
demanding power-consumption and space require-
ments. For pin-compatible 10-bit ADCs, see the
MAX157 and MAX159.
Applications
Battery-Powered Systems Instrumentation
Portable Data Logging Test Equipment
Isolated Data Acquisition Medical Instruments
Process-Control Monitoring System Supervision
Features
♦ Single-Supply Operation (+2.7V to +5.25V)
♦ Two Single-Ended Channels (MAX144)
One Pseudo-Differential Channel (MAX145)
♦ Low Power
0.9mA (108ksps, +3V Supply)
100µA (10ksps, +3V Supply)
10µA (1ksps, +3V Supply)
0.2µA (Power-Down Mode)
♦ Internal Track/Hold
♦ 108ksps Sampling Rate
♦ SPI/QSPI/MICROWIRE-Compatible 3-Wire
Serial Interface
♦ Space-Saving 8-Pin µMAX Package
♦ Pin-Compatible 10-Bit Versions Available
MAX144/MAX145
+2.7V, Low-Power, 2-Channel, 108ksps,
Serial 12-Bit ADCs in 8-Pin µMAX
________________________________________________________________
Maxim Integrated Products
1
CS/SHDN
REFGND
1
2
8
7
SCLK
DOUT
( ) ARE FOR MAX145 ONLY
CH0 (CH+)
CH1 (CH-)
V
DD
µMAX/DIP
TOP VIEW
3
4
6
5
MAX144
MAX145
19-1387; Rev 0; 11/98
PART
MAX144ACUA
MAX144BCUA
MAX144ACPA 0°C to +70°C
0°C to +70°C
0°C to +70°C
TEMP. RANGE PIN-PACKAGE
8 µMAX
8 µMAX
8 Plastic DIP
*
Dice are specified at T
A
= +25°C, DC parameters only.
**
Contact factory for availability.
Pin Configuration
Ordering Information
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
INL
(LSB)
±0.5
±1
±0.5
MAX144BCPA
MAX144BC/D
MAX144AEUA -40°C to +85°C
0°C to +70°C
0°C to +70°C 8 Plastic DIP
Dice*
8 µMAX
±1
±1
±0.5
MAX144BEUA
MAX144AEPA
MAX144BEPA -40°C to +85°C
-40°C to +85°C
-40°C to +85°C 8 µMAX
8 Plastic DIP
8 Plastic DIP
±1
±0.5
±1
MAX144AMJA
MAX144BMJA
MAX145ACUA
0°C to +70°C
-55°C to +125°C
-55°C to +125°C 8 CERDIP**
8 CERDIP**
8 µMAX
±0.5
±1
±0.5
MAX145BCUA 0°C to +70°C 8 µMAX ±1
MAX145ACPA
MAX145BCPA
MAX145BC/D 0°C to +70°C
0°C to +70°C
0°C to +70°C 8 Plastic DIP
8 Plastic DIP
Dice*
±0.5
±1
±1
MAX145AEUA
MAX145BEUA
MAX145AEPA -40°C to +85°C
-40°C to +85°C
-40°C to +85°C 8 µMAX
8 µMAX
8 Plastic DIP
±0.5
±1
±0.5
MAX145BEPA
MAX145AMJA
MAX145BMJA -55°C to +125°C
-55°C to +125°C
-40°C to +85°C 8 Plastic DIP
8 CERDIP**
8 CERDIP**
±1
±0.5
±1
MAX144/MAX145
+2.7V, Low-Power, 2-Channel, 108ksps,
Serial 12-Bit ADCs in 8-Pin µMAX
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
DD
= +2.7V to +5.25V, V
REF
= 2.5V, 0.1µF capacitor at REF, f
SCLK
= 2.17MHz, 16 clocks/conversion cycle (108ksps),
CH- = GND for MAX145, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°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.
V
DD
to GND..............................................................-0.3V to +6V
CH0, CH1 (CH+, CH-) to GND ................. -0.3V to (V
DD
+ 0.3V)
REF to GND .............................................. -0.3V to (V
DD
+ 0.3V)
Digital Inputs to GND. ............................................. -0.3V to +6V
DOUT to GND............................................ -0.3V to (V
DD
+ 0.3V)
DOUT Sink Current ........................................................... 25mA
Continuous Power Dissipation (T
A
= +70°C)
µMAX (derate 4.1mW/°C above +70°C) .................... 330mW
Plastic DIP (derate 9.09mW/°C above +70°C) ............727mW
CERDIP (derate 8.00mW/°C above +70°C) ............... 640mW
Operating Temperature Ranges (T
A
)
MAX144/MAX145_C_A .......................................0°C to +70°C
MAX144/MAX145_E_A. ...................................-40°C to +85°C
MAX144/MAX145_M_A ................................ -55°C to +125°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10sec) .............................+300°C
MAX14_A
MAX14_B
No missing codes over temperature
CONDITIONS
LSB
±0.5
INLRelative Accuracy (Note 2)
Bits
12
RESResolution
±1
LSB±0.75DNLDifferential Nonlinearity
UNITSMIN TYP MAXSYMBOLPARAMETER
ppm/°C±0.8Gain Temperature Coefficient
LSB±3
LSB±3Offset Error
Gain Error (Note 3)
LSB±0.05
Channel-to-Channel Offset
Matching
LSB±0.05
Channel-to-Channel Gain
Matching
-3dB rolloff
f
IN
= 65kHz, V
IN
= 2.5Vp-p (Note 4)
External clock, f
SCLK
= 2.17MHz,
16 clocks/conversion cycle
MHz1.0Full-Power Bandwidth
MHz2.25
dB-85Channel-to-Channel Crosstalk
Small-Signal Bandwidth
µs
7.4
t
CONV
Conversion Time (Note 5)
Total Harmonic Distortion
(including 5th-order harmonic)
dB70SINAD
Signal-to-Noise Plus
Distortion Ratio
dB-80THD
dB80SFDRSpurious-Free Dynamic Range
Internal clock mode, for data transfer only
External clock mode
Internal clock
05
MHz
0.1 2.17
f
SCLK
ps<50Aperture Jitter
Serial Clock Frequency
57
µs2.5t
ACQ
T/H Acquisition Time
ns25Aperture Delay
DC ACCURACY (Note 1)
DYNAMIC SPECIFICATIONS (f
IN(sine-wave)
= 10kHz, V
IN
= 2.5Vp-p, 108ksps, f
SCLK
= 2.17MHz, CH- = GND for MAX145)
CONVERSION RATE
MAX144/MAX145
+2.7V, Low-Power, 2-Channel, 108ksps,
Serial 12-Bit ADCs in 8-Pin µMAX
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +2.7V to +5.25V, V
REF
= 2.5V, 0.1µF capacitor at REF, f
SCLK
= 2.17MHz, 16 clocks/conversion cycle (108ksps),
CH- = GND for MAX145, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
V
REF
= 2.5V
On/off leakage current, V
IN
= 0 to V
DD
kΩ18 25Input Resistance
µA100 140
V
0V
DD
+ 50mV
V
REF
Input Voltage Range (Note 7)
Input Current
µA0.01 10
CONDITIONS
Shutdown REF Input Current
µA±0.01 ±1Multiplexer Leakage Current
V0V
REF
V
IN
Analog Input Voltage Range
(Note 6)
pF16C
IN
Input Capacitance
UNITS
MIN TYP MAX
SYMBOLPARAMETER
Input Leakage Current I
IN
±1 µA
Input Hysteresis V
HYS
0.2 V
0.2 5 µA
Input High Voltage V
IH
2.0
V
3.0
Input Low Voltage V
IL
0.8 V
Positive Supply Current I
DD
0.9 2.0 mA
Three-State Output Capacitance C
OUT
15 pF
Positive Supply Voltage V
DD
2.7 5.25 V
Power-Supply Rejection
(Note 9)
Shutdown, CS/SHDN = GND
Operating mode
PSR ±0.15 mV
CS/SHDN = V
DD
(Note 8)
V
DD
= 2.7V to 5.25V,
V
REF
= 2.5V, full-scale input
Three-State Output Leakage
Current
±10 µA
Output High Voltage V
OH
V
DD
- 0.5 V
Output Low Voltage
Input Capacitance
V
IN
= 0 or V
DD
C
IN
15 pF
V
OL
0.4
V
0.5
V
DD
≤ 3.6V
V
DD
> 3.6V
CS/SHDN = V
DD
I
SOURCE
= 0.5mA
(Note 8)
I
SINK
= 5mA
I
SINK
= 16mA
ANALOG INPUTS
EXTERNAL REFERENCE
DIGITAL INPUTS (CS/SHDN) AND OUTPUT (DOUT)
POWER REQUIREMENTS
123456NEXT
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