Maxim MAX144BEUA, MAX144BEPA, MAX144BCUA, MAX144BCPA, MAX144BC-D Datasheet

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General Description
The MAX144/MAX145 low-power, 12-bit analog-to­digital 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 succes­sive-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 (VDD= +3.6V) at the maximum sampling rate of 108ksps. At slower through­put rates, the automatic shutdown (0.2µA) further reduces power consumption.
The MAX144 provides 2-channel, single-ended opera­tion 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 data­through the 3-wire serial interface, which is SPI™, QSPI™, and MICROWIRE™-compatible.
Excellent dynamic performance and low power, com­bined with ease of use and small package size, make these converters ideal for battery-powered and data­acquisition applications, or for other circuits with demanding power-consumption and space require­ments. 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/Hold108ksps Sampling RateSPI/QSPI/MICROWIRE-Compatible 3-Wire
Serial Interface
Space-Saving 8-Pin µMAX PackagePin-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
87SCLK
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 TA= +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
(VDD= +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 TA= +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.
VDDto 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
fIN= 65kHz, VIN= 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, VIN= 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)
(VDD= +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 TA= +25°C.)
V
REF
= 2.5V
On/off leakage current, VIN= 0 to V
DD
k18 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 = VDD(Note 8)
VDD= 2.7V to 5.25V, V
REF
= 2.5V, full-scale input
Three-State Output Leakage Current
±10 µA
Output High Voltage V
OH
VDD- 0.5 V
Output Low Voltage
Input Capacitance
VIN= 0 or V
DD
C
IN
15 pF
V
OL
0.4 V
0.5
VDD≤ 3.6V VDD> 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
ns
MAX144/MAX145
+2.7V, Low-Power, 2-Channel, 108ksps, Serial 12-Bit ADCs in 8-Pin µMAX
4 _______________________________________________________________________________________
TIMING CHARACTERISTICS (Figure 7)
(VDD= +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 TA= +25°C.)
Internal clock, SCLK for data transfer only (Note 8)
External clock
Internal clock, SCLK for data transfer only
CL = 100pF, Figure 1
External clock
CL= 100pF
50
ns
215
t
CH
05
CL= 100pF, Figure 1 External clock
SCLK Pulse Width High
ns
215
CONDITIONS
t
CL
SCLK Pulse Width Low
ns
120
t
TR
CS/SHDN Rise to Output Disable
ns
120
t
DV
µs
2.5
t
WAKE
Wake-Up Time (Note 10) CS/SHDN Fall to Output Enable
ns
20 120
t
DO
SCLK Fall to Output Data Valid
MHz
0.1 2.17
f
SCLK
SCLK Clock Frequency
UNITSMIN TYP MAXSYMBOLPARAMETER
Internal clock, SCLK for data transfer only (Note 8)
50
ns
60
t
SCLKS
SCLK to CS/SHDN Setup
ns
60
t
CS
CS/SHDN Pulse Width
Note 1: Tested at VDD= +2.7V. Note 2: Relative accuracy is the deviation of the analog value at any code from its theoretical value after full-scale range has been
calibrated.
Note 3: Offset nulled. Note 4: “On” channel is grounded; sine wave applied to “off” channel (MAX144 only). Note 5: Conversion time is defined as the number of clock cycles times the clock period; clock has 50% duty cycle. Note 6: The common-mode range for the analog inputs is from GND to V
DD
(MAX145 only).
Note 7: ADC performance is limited by the converter’s noise floor, typically 300µVp-p. Note 8: Guaranteed by design. Not subject to production testing. Note 9: Measured as V
FS(2.7V)
- V
FS(5.25V)
.
Note 10: SCLK must remain stable during this time.
MAX144/MAX145
+2.7V, Low-Power, 2-Channel, 108ksps,
Serial 12-Bit ADCs in 8-Pin µMAX
_______________________________________________________________________________________
5
500
700
900
1100
1300
1500
2.5 3.0 3.5 4.0 4.5 5.55.0
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX144/5-01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (µA)
V
REF
= V
DD
RL = C
L
= 50pF
CODE = 101010100000
0
200
400
600
800
1000
-60 20 40-20 0-40 60 80 100 120 140
SHUTDOWN CURRENT
vs. TEMPERATURE
MAX144/5-05
TEMPERATURE (°C)
SHUTDOWN CURRENT (nA)
V
REF
= V
DD
500
750
1250
1000
1500
-60 -20 0 20 40-40 60 80 100 120 140
SUPPLY CURRENT
vs. TEMPERATURE
MAX144/5-02
TEMPERATURE (°C)
SUPPLY CURRENT (µA)
V
REF
= V
DD
RL = C
L
= 50pF
CODE = 101010100000
0
200
400
600
800
1000
SHUTDOWN CURRENT vs. SUPPLY VOLTAGE
MAX144/5-04
SUPPLY VOLTAGE (V)
SHUTDOWN CURRENT (nA)
2.5 3.0 3.5 4.0 4.5 5.55.0
V
REF
= V
DD
Typical Operating Characteristics
(VDD= +3.0V, V
REF
= 2.5V, 0.1µF at REF, f
SCLK
= 2.17MHz, 16 clocks/conversion cycle (108ksps), CH- = GND for MAX145, TA= +25°C,
unless otherwise noted.)
SUPPLY CURRENT vs.
SAMPLING RATE
MAX144/5-03
SAMPLING RATE (sps)
SUPPLY CURRENT (µA)
10,000
0.1
1
10
100
1000
0.1 100 1k 10k1 10 100k
VDD = V
REF
CL = 20pF CODE = 101010100000
0
0.2
0.4
0.6
0.8
1.0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
OFFSET ERROR
vs. SUPPLY VOLTAGE
MAX144/5-06
SUPPLY VOLTAGE (V)
OFFSET ERROR (LSB)
0
0.2
0.1
0.4
0.3
0.6
0.5
0.7
0.9
0.8
1.0
OFFSET ERROR
vs. TEMPERATURE
MAX144/5-07
TEMPERATURE (°C)
OFFSET ERROR (LSB)
-60 -10 15-35 40 65 90 115 140
-0.5
-0.3
-0.4
-0.1
-0.2
0.1 0
0.2
0.4
0.3
0.5
2.5 3.53.0 4.0 4.5 5.0 5.5
GAIN ERROR
vs. SUPPLY VOLTAGE
MAX144/5-08
VDD (V)
GAIN ERROR (LSB)
-0.5
-0.3
-0.4
-0.1
-0.2
0.1 0
0.2
0.4
0.3
0.5
GAIN ERROR
vs. TEMPERATURE
MAX144/5-09
GAIN ERROR (LSB)
TEMPERATURE (°C)
-60 -10 15-35 40 65 90 115 140
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