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PDF MAX145 Data sheet ( Hoja de datos )
| Número de pieza | MAX145 | |
| Descripción | 0.1%-Accurate Signal Conditioner for Piezoresistive Sensor Compensation | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX145 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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19-1387; Rev 0; 11/98
+2.7V, Low-Power, 2-Channel, 108ksps,
Serial 12-Bit ADCs in 8-Pin µMAX
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 (VDD = +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 VREF. The
MAX145 accepts pseudo-differential inputs ranging
from 0 to VREF. 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.
Battery-Powered Systems
Portable Data Logging
Isolated Data Acquisition
Process-Control Monitoring
Applications
Instrumentation
Test Equipment
Medical Instruments
System Supervision
TOP VIEW
Pin Configuration
VDD 1
CH0 (CH+) 2
CH1 (CH-) 3
GND 4
MAX144
MAX145
8 SCLK
7 DOUT
6 CS/SHDN
5 REF
( ) ARE FOR MAX145 ONLY µMAX/DIP
Features
o Single-Supply Operation (+2.7V to +5.25V)
o Two Single-Ended Channels (MAX144)
One Pseudo-Differential Channel (MAX145)
o Low Power
0.9mA (108ksps, +3V Supply)
100µA (10ksps, +3V Supply)
10µA (1ksps, +3V Supply)
0.2µA (Power-Down Mode)
o Internal Track/Hold
o 108ksps Sampling Rate
o SPI/QSPI/MICROWIRE-Compatible 3-Wire
Serial Interface
o Space-Saving 8-Pin µMAX Package
o Pin-Compatible 10-Bit Versions Available
Ordering Information
PART
TEMP. RANGE PIN-PACKAGE
MAX144ACUA 0°C to +70°C 8 µMAX
MAX144BCUA 0°C to +70°C 8 µMAX
MAX144ACPA 0°C to +70°C 8 Plastic DIP
MAX144BCPA 0°C to +70°C 8 Plastic DIP
MAX144BC/D 0°C to +70°C Dice*
MAX144AEUA -40°C to +85°C 8 µMAX
MAX144BEUA -40°C to +85°C 8 µMAX
MAX144AEPA -40°C to +85°C 8 Plastic DIP
MAX144BEPA -40°C to +85°C 8 Plastic DIP
MAX144AMJA -55°C to +125°C 8 CERDIP**
MAX144BMJA -55°C to +125°C 8 CERDIP**
MAX145ACUA 0°C to +70°C 8 µMAX
MAX145BCUA 0°C to +70°C 8 µMAX
MAX145ACPA 0°C to +70°C 8 Plastic DIP
MAX145BCPA 0°C to +70°C 8 Plastic DIP
MAX145BC/D 0°C to +70°C Dice*
MAX145AEUA -40°C to +85°C 8 µMAX
MAX145BEUA -40°C to +85°C 8 µMAX
MAX145AEPA -40°C to +85°C 8 Plastic DIP
MAX145BEPA -40°C to +85°C 8 Plastic DIP
MAX145AMJA -55°C to +125°C 8 CERDIP**
MAX145BMJA -55°C to +125°C 8 CERDIP**
INL
(LSB)
±0.5
±1
±0.5
±1
±1
±0.5
±1
±0.5
±1
±0.5
±1
±0.5
±1
±0.5
±1
±1
±0.5
±1
±0.5
±1
±0.5
±1
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
*Dice are specified at TA = +25°C, DC parameters only.
**Contact factory for availability.
________________________________________________________________ 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.
1 page  
+2.7V, Low-Power, 2-Channel, 108ksps,
Serial 12-Bit ADCs in 8-Pin µMAX
Typical Operating Characteristics
(VDD = +3.0V, VREF = 2.5V, 0.1µF at REF, fSCLK = 2.17MHz, 16 clocks/conversion cycle (108ksps), CH- = GND for MAX145, TA = +25°C,
unless otherwise noted.)
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
1500
VREF = VDD
RL = ∞
1300 CL = 50pF
CODE = 101010100000
1100
900
SUPPLY CURRENT
vs. TEMPERATURE
1500
VREF = VDD
RL = ∞
1250
CL = 50pF
CODE = 101010100000
1000
10,000
1000
SUPPLY CURRENT vs.
SAMPLING RATE
VDD = VREF
CL = 20pF
CODE = 101010100000
100
10
750
700 1
500
2.5
3.0 3.5 4.0 4.5 5.0
SUPPLY VOLTAGE (V)
5.5
SHUTDOWN CURRENT
vs. SUPPLY VOLTAGE
1000
VREF = VDD
800
500
-60 -40 -20 0 20 40 60 80 100 120 140
TEMPERATURE (°C)
SHUTDOWN CURRENT
vs. TEMPERATURE
1000
VREF = VDD
800
0.1
0.1
1 10 100 1k 10k 100k
SAMPLING RATE (sps)
OFFSET ERROR
vs. SUPPLY VOLTAGE
1.0
0.8
600 600
0.6
400 400
0.4
200 200
0.2
0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
SUPPLY VOLTAGE (V)
OFFSET ERROR
vs. TEMPERATURE
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
-60 -35 -10 15 40 65 90 115 140
TEMPERATURE (°C)
0
-60 -40 -20 0 20 40 60 80 100 120 140
TEMPERATURE (°C)
0.5
0.4
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
-0.4
-0.5
2.5
GAIN ERROR
vs. SUPPLY VOLTAGE
3.0 3.5 4.0 4.5 5.0
VDD (V)
5.5
0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
SUPPLY VOLTAGE (V)
GAIN ERROR
vs. TEMPERATURE
0.5
0.4
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
-0.4
-0.5
-60 -35 -10 15 40 65 90 115 140
TEMPERATURE (°C)
_______________________________________________________________________________________ 5
5 Page 
+2.7V, Low-Power, 2-Channel, 108ksps,
Serial 12-Bit ADCs in 8-Pin µMAX
DOUT valid timing characteristic. Data should be
clocked into the µP on SCLK’s rising edge.
4) Pull CS/SHDN high at or after the 16th falling clock
edge. If CS/SHDN remains low, trailing zeros will be
clocked out after the LSB.
5) With CS/SHDN high, wait at least 60ns (tCS) before
starting a new conversion by pulling CS/SHDN low.
A conversion can be aborted by pulling CS/SHDN
high before the conversion ends; wait at least 60ns
before starting a new conversion.
Data can be output in two 8-bit sequences or continu-
ously. The bytes will contain the result of the conversion
padded with three leading ones and the channel identi-
fication before the MSB. If the serial clock hasn’t been
idled after the last LSB and CS/SHDN is kept low,
DOUT sends trailing zeros.
SPI and MICROWIRE Interface
When using SPI (Figure 8a) or MICROWIRE (Figure 8b)
interfaces, set CPOL = 0 and CPHA = 0. Conversion
begins with a falling edge on CS/SHDN (Figure 8c).
Two consecutive 8-bit readings are necessary to obtain
the entire 12-bit result from the ADC. DOUT data transi-
tions on the serial clock’s falling edge and is clocked
into the µP on SCLK’s rising edge. The first 8-bit data
stream contains three leading ones, the channel identi-
CS/SHDN
SCLK
tSCLKS
•••
tCH
tCL
•••
DOUT
HIGH-2
tDV
Figure 7. Detailed Serial-Interface Timing Sequence
•••
tDO
tCS
tTR
HIGH-2
I/O
SCK
MISO
SPI
VDD
SS
CS/SHDN
SCLK
DOUT
MAX144
MAX145
I/O
SK
SI
MICROWIRE
CS/SHDN
SCLK
DOUT
MAX144
MAX145
Figure 8a. SPI Connections
8b. MICROWIRE Connections
SCLK
CS/SHDN
1ST BYTE READ
1 2345678
DOUT*
CHID D11 D10 D9 D8
SAMPLING INSTANT MSB
*WHEN CS/SHDN IS HIGH, DOUT = HIGH-Z
D7
Figure 8c. SPI/MICROWIRE Interface Timing Sequence (CPOL = CPHA = 0)
2ND BYTE READ
9 10 11 12 13 14 15 16
D6 D5 D4 D3 D2 D1 D0
LSB
HIGH-Z
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet MAX145.PDF ] | |
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