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PDF MAX1065 Data sheet ( Hoja de datos )
| Número de pieza | MAX1065 | |
| Descripción | (MAX1065 / MAX1066) 14-Bit Analog-to-Digital Converters | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX1065 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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19-2466; Rev 0; 4/02
Low-Power, 14-Bit Analog-to-Digital Converters
with Parallel Interface
General Description
The MAX1065/MAX1066 14-bit, low-power successive
approximation analog-to-digital converters (ADCs) fea-
ture automatic power-down, a factory-trimmed internal
clock, and a high-speed, 14-bit-wide (MAX1065) or
byte-wide (MAX1066) parallel interface. The devices
operate from a single 4.75V to 5.25V analog supply and
a 2.7V to 5.25V digital supply.
The MAX1065/MAX1066 use an internal 4.096V refer-
ence or an external reference. The MAX1065/MAX1066
consume only 1.8mA at a sampling rate of 165ksps with
external reference and 2.7mA with internal reference.
AutoShutdown™ reduces supply current to 0.1mA at
10ksps.
The MAX1065/MAX1066 are ideal for high-performance,
battery-powered, data-acquisition applications.
Excellent dynamic performance and low-power con-
sumption in a small package make the MAX1065/
MAX1066 the best choice for circuits with demanding
power consumption and space requirements.
The 14-bit-wide MAX1065 is available in a 28-pin TSSOP
package, and the byte-wide MAX1066 is available in a
20-pin TSSOP package. Both devices are available in
either the 0°C to +70°C commercial, or the -40°C to
+85°C extended temperature range.
Applications
Temperature
Sensor/Monitor
Industrial Process
www.DatCaSohneterot4lU.com
I/O Boards
Data-Acquisition
Systems
Cable/Harness Tester
Accelerometer
Measurements
Digital Signal Processing
Typical Operating Circuit
5V ANALOG
5V DIGITAL
0.1µF
0.1µF
ANALOG INPUT
AVDD
AIN
µP DATA
DVDD
BUS
D0–D13
R/C MAX1065 EOC
CS REF
RESET
REFADJ
AGND DGND 0.1µF
1µF
Features
o 14-Bit-Wide (MAX1065) and Byte-Wide (MAX1066)
Parallel Interface
o High Speed: 165ksps Sample Rate
o Accurate: ±1LSB DNL (max), ±1LSB INL (max)
o 4.096V, 35ppm/°C Internal Reference
o External Reference Range 3.8V to 5.25V
o Single 4.75V to 5.25V Analog Supply Voltage
o 2.7V to 5.25V Digital Supply Voltage
o Low Supply Current
1.8mA (External Reference)
2.7mA (Internal Reference)
0.1mA AutoShutdown Mode (10ksps, External
Reference)
o Small Footprint
28-Pin TSSOP Package (14-Bit Wide)
20-Pin TSSOP Package (Byte Wide)
PART
MAX1065ACUI
MAX1065BCUI
MAX1065CCUI
MAX1065AEUI
MAX1065BEUI
MAX1065CEUI
MAX1066ACUP
MAX1066BCUP
MAX1066CCUP
MAX1066AEUP
MAX1066BEUP
MAX1066CEUP
Ordering Information
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
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
28 TSSOP
28 TSSOP
28 TSSOP
28 TSSOP
28 TSSOP
28 TSSOP
20 TSSOP
20 TSSOP
20 TSSOP
20 TSSOP
20 TSSOP
20 TSSOP
INL
±1
±2
±3
±1
±2
±3
±1
±2
±3
±1
±2
±3
Pin Configurations appear at end of data sheet.
AutoShutdown is a registered trademark of Maxim Integrated
Products, Inc.
________________________________________________________________ Maxim Integrated Products 1
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.
1 page  
Low-Power, 14-Bit Analog-to-Digital Converters
with Parallel Interface
Typical Operating Characteristics
(AVDD = DVDD = 5V, external reference = 4.096V, CREF = 1µF, CREFADJ = 0.1µF, 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
DNL vs. OUTPUT CODE
4096 8192 12288
OUTPUT CODE
16384
IAVDD + IDVDD SUPPLY CURRENT
vs. TEMPERATURE
3.5
3.0
2.5
2.0
1.5
1.0
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0.5
SAMPLE RATE = 165ksps
0
-40 -20 0 20 40 60 80
TEMPERATURE (°C)
2.0
1.5
1.0
0.5
0
-0.5
-1.0
-1.5
-2.0
0
INL vs. OUTPUT CODE
IAVDD + IDVDD SUPPLY CURRENT
vs. SAMPLE RATE
10
1
0.1
0.01
0.001
4096 8192 12288
OUTPUT CODE
16384
0.0001
0.01
0.1 1 10 100
CONVERSION RATE (ksps)
1000
IAVDD + IDVDD SHUTDOWN CURRENT
vs. TEMPERATURE
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
-40 -20
0 20 40 60
TEMPERATURE (°C)
80
4.136
4.126
4.116
4.106
4.096
4.086
4.076
4.066
4.056
-40
INTERNAL REFERENCE
vs. TEMPERATURE
-20 0 20 40 60
TEMPERATURE (°C)
80
OFFSET ERROR vs. TEMPERATURE
1000
800
600
400
200
0
-200
-400
-600
-800
0
-40 -20
0 20 40 60
TEMPERATURE (°C)
80
GAIN ERROR vs. TEMPERATURE
0.020
0.015
0.010
0.005
0
-0.005
-0.010
-0.015
-0.020
-40 -20
0 20 40 60
TEMPERATURE (°C)
80
100
90
80
70
60
50
40
30
20
10
0
0.1
SINAD vs. FREQUENCY
SAMPLE RATE = 165ksps
1 10
FREQUENCY (kHz)
100
_______________________________________________________________________________________ 5
5 Page 
Low-Power, 14-Bit Analog-to-Digital Converters
with Parallel Interface
5V
100kΩ
68kΩ
MAX1065
MAX1066
REFADJ
OUTPUT CODE
11...111
11...110
11...101
FULL-SCALE
TRANSITION
150kΩ
0.22µF
Figure 7. MAX1065/MAX1066 Reference Adjust Circuit
Reading the Conversion Result
EOC is provided to flag the microprocessor when a con-
version is complete. The falling edge of EOC signals
that the data is valid and ready to be output to the bus.
D0–D13 are the parallel outputs of the MAX1065/
MAX1066. These three-state outputs allow for direct
connection to a microcontroller I/O bus. The outputs
remain high-impedance during acquisition and conver-
sion. Data is loaded onto the bus with the third falling
edge of CS with R/C high after tDOns. Bringing CS high
forces the output bus back to high-impedance. The
MAX1065/MAX1066 then waits for the next falling edge
of CS to start the next conversion cycle (Figure 2).
The MAX1065 loads the conversion result onto a 14-bit-
wide data bus while the MAX1066 has a byte-wide out-
put format. HBEN toggles the output between the
most/least significant byte. The least significant byte is
loaded onto the output bus when HBEN is low and the
www.DmatoaSstheseigt4nUif.cicoamnt byte is on the bus when HBEN is high
(Figure 2).
RESET
Toggle RESET with CS high. The next falling edge of
CS will begin acquisition. This reset is an alternative to
the dummy conversion explained in the Starting a
Conversion section.
Transfer Function
Figure 8 shows the MAX1065/MAX1066 output transfer
function. The output is coded in standard binary.
Input Buffer
Most applications require an input buffer amplifier to
achieve 14-bit accuracy. If the input signal is multiplexed,
the input channel should be switched immediately after
acquisition, rather than near the end of or after a conver-
sion. This allows more time for the input buffer amplifier to
respond to a large step-change in input signal. The input
amplifier must have a high enough slew rate to complete
00...011
00...010
00...001
00...000
012 3
INPUT VOLTAGE (LSB)
FS = VREF
1LSB = VREF
16384
FS
FS - 3/2LSB
Figure 8. MAX1065/MAX1066 Transfer Function
the required output voltage change before the beginning
of the acquisition time. At the beginning of acquisition, the
internal sampling capacitor array connects to AIN (the
amplifier output) causing some output disturbance.
Ensure that the sampled voltage has settled to within the
required limits before the end of the acquisition time. If
the frequency of interest is low, AIN can be bypassed
with a large enough capacitor to charge the internal sam-
pling capacitor with very little ripple. However, for AC use,
AIN must be driven by a wideband buffer (at least
10MHz), which must be stable with the ADC’s capacitive
load (in parallel with any AIN bypass capacitor used) and
also settle quickly. An example of this circuit using the
MAX4434 is given in Figure 9.
ANALOG
INPUT
10Ω
MAX4434
MAX1065/
MAX1066
AIN
40pF
Figure 9. MAX1065/MAX1066 Fast Settling Input Buffer
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet MAX1065.PDF ] | |
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