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Número de pieza | MAX1062 | |
Descripción | 200ksps ADC | |
Fabricantes | Maxim Integrated | |
Logotipo | ||
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No Preview Available ! 19-2203; Rev 1; 5/09
14-Bit, +5V, 200ksps ADC with 10µA Shutdown
General Description
The MAX1062 low-power, 14-bit analog-to-digital con-
verter (ADC) features a successive approximation ADC,
automatic power-down, fast 1.1µs wake-up, and a high-
speed SPI™/QSPI™/MICROWIRE™-compatible inter-
face. The MAX1062 operates with a single +5V analog
supply and features a separate digital supply, allowing
direct interfacing with 2.7V to 5.25V digital logic.
At the maximum sampling rate of 200ksps, the
MAX1062 consumes typically 2.75mA. Power con-
sumption is typically 13.75mW (AVDD = DVDD = 5V) at
a 200ksps (max) sampling rate. AutoShutdown™
reduces supply current to 140µA at 10ksps and to less
than 10µA at reduced sampling rates.
Excellent dynamic performance and low power, com-
bined with ease of use and small package size (10-pin
µMAX®) make the MAX1062 ideal for battery-powered
and data-acquisition applications or for other circuits
with demanding power consumption and space
requirements.
Features
♦ 14-Bit Resolution, 1LSB DNL
♦ +5V Single-Supply Operation
♦ Adjustable Logic Level (2.7V to 5.25V)
♦ Input Voltage Range: 0 to VREF
♦ Internal Track/Hold, 4MHz Input Bandwidth
♦ SPI/QSPI/MICROWIRE-Compatible Serial Interface
♦ Small 10-Pin µMAX Package
♦ Low Power
2.75mA at 200ksps
140µA at 10ksps
0.1µA in Power-Down Mode
Applications
Motor Control
Industrial Process Control
Industrial I/O Modules
Data-Acquisition Systems
Thermocouple Measurements
Accelerometer Measurements
Portable- and Battery-Powered Equipment
Ordering Information
PART
MAX1062ACUB
MAX1062BCUB
MAX1062CCUB
MAX1062AEUB
MAX1062BEUB
MAX1062CEUB
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
10 µMAX
10 µMAX
10 µMAX
10 µMAX
10 µMAX
10 µMAX
INL
(LSB)
±1
±2
±3
±1
±2
±3
Functional Diagram appears at end of data sheet.
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
AutoShutdown is a trademark of Maxim Integrated Products, Inc.
µMAX is a registered trademark of Maxim Integrated Products, Inc.
Pin Configuration
TOP VIEW
REF 1
AVDD 2
AGND 3
CS 4
SCLK 5
MAX1062
µMAX
10 AIN
9 AGND
8 DVDD
7 DGND
6 DOUT
________________________________________________________________ Maxim Integrated Products 1
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
1 page 14-Bit, +5V, 200ksps ADC with 10µA Shutdown
Typical Operating Characteristics
(AVDD = DVDD = +5V, fSCLK = 4.8MHz, CLOAD = 50pF, VREF = +4.096V, TA = 25°C, unless otherwise noted.)
1.0
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
0
INL vs. OUTPUT CODE
3276 6553 9830 13107 16384
OUTPUT CODE
1.0
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
0
DNL vs. OUTPUT CODE
3276 6553 9830 13107 16384
OUTPUT CODE
SINAD VS. FREQUENCY
100
SFDR VS. FREQUENCY
110
90
80
70
60
50
40
30
20
10 fSAMPLE = 200kHz
0
0.1
1 10
FREQUENCY (kHz)
100
90
80
70
60
50
40
30
20
10 fSAMPLE = 200kHz
0
100 0.1
1
10
FREQUENCY (kHz)
100
MAX1062 FFT
0
-20
-40
-60
-80
-100
-120
-140
0 10 20 30 40 50 60 70 80 90 100
FREQUENCY (kHz)
THD VS. FREQUENCY
0
-10 fSAMPLE = 200kHz
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
0.1
1 10
FREQUENCY (kHz)
100
SUPPLY CURRENT
VS. CONVERSION RATE
10
1
0.1
0.01
0.001
0.0001
0.01
0.1 1 10 100 1000
CONVERSION RATE (kHz)
SUPPLY CURRENT
VS. SUPPLY VOLTAGE
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
4.75
4.85 4.95 5.05 5.15
SUPPLY VOLTAGE (V)
5.25
SUPPLY CURRENT VS. TEMPERATURE
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
-40
AVDD = DVDD= +5V
-15 10 35 60
TEMPERATURE (°C)
85
_______________________________________________________________________________________ 5
5 Page 14-Bit, +5V, 200ksps ADC with 10µA Shutdown
A0 A1
IN1
IN2 4-TO-1
MUX
IN3
OUT
IN4
MAX1062
AIN
CS
CLK
CONVERSION
ACQUISITION
CS
A0
A1
CHANGE MUX INPUT HERE
Figure 9. Change Multiplexer Input Near Beginning of Conversion to Allow Time for Slewing and Settling
high-frequency components may be aliased into the
frequency band of interest. Minimize noise by present-
ing a low impedance (at the frequencies contained in
the noise signal) at the inputs. This requires bypassing
AIN to AGND, or buffering the input with an amplifier
that has a small-signal bandwidth of several MHz, or
preferably both. AIN has about 4MHz of bandwidth.
Distortion
Avoid degrading dynamic performance by choosing an
amplifier with distortion much less than the MAX1062’s
total harmonic distortion (THD = -99dB at 1kHz) at fre-
quencies of interest. If the chosen amplifier has insuffi-
cient common-mode rejection, which results in
degraded THD performance, use the inverting configu-
ration (positive input grounded) to eliminate errors from
this source. Low temperature-coefficient, gain-setting
resistors reduce linearity errors caused by resistance
changes due to self-heating. To reduce linearity errors
due to finite amplifier gain, use amplifier circuits with
sufficient loop gain at the frequencies of interest.
DC Accuracy
To improve DC accuracy, choose a buffer with an offset
much less than the MAX1062’s offset (1mV (max) for +5V
supply), or whose offset can be trimmed while maintain-
ing stability over the required temperature range.
Serial Interfaces
The MAX1062’s interface is fully compatible with SPI,
QSPI, and MICROWIRE standard serial interfaces.
If a serial interface is available, establish the CPU’s ser-
ial interface as master, so that the CPU generates the
serial clock for the MAX1062. Select a clock frequency
between 100kHz and 4.8MHz:
1) Use a general-purpose I/O line on the CPU to pull
CS low.
2) Activate SCLK for a minimum of 24 clock cycles.
The serial data stream of eight leading zeros fol-
lowed by the MSB of the conversion result begins at
the falling edge of CS. DOUT transitions on SCLK’s
falling edge and the output is available in MSB-first
______________________________________________________________________________________ 11
11 Page |
Páginas | Total 18 Páginas | |
PDF Descargar | [ Datasheet MAX1062.PDF ] |
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