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PDF MAX1166 Data sheet ( Hoja de datos )
| Número de pieza | MAX1166 | |
| Descripción | Low-Power / 16-Bit Analog-to-Digital Converters with Parallel Interface | |
| Fabricantes | Maxim Integrated | |
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19-2551; Rev 0; 6/02
Low-Power, 16-Bit Analog-to-Digital Converters
with Parallel Interface
General Description
The MAX1165/MAX1166 16-bit, low-power, successive-
approximation analog-to-digital converters (ADCs) fea-
ture automatic power-down, factory-trimmed internal
clock, and a 16-bit wide (MAX1165) or byte wide
(MAX1166) 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 MAX1165/MAX1166 use an internal 4.096V refer-
ence or an external reference. The MAX1165/MAX1166
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 MAX1165/MAX1166 are ideal for high-perfor-
mance, battery-powered, data-acquisition applications.
Excellent dynamic performance and low power con-
sumption in a small package make the MAX1165/
MAX1166 ideal for circuits with demanding power con-
sumption and space requirements.
The 16-bit wide MAX1165 is available in a 28-pin
TSSOP package and the byte wide MAX1166 is avail-
able 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.
AutoShutdown is a trademark of Maxim Integrated Products, Inc.
Applications
Temperature Sensor/Monitor
Industrial Process Control
I/O Boards
Data-Acquisition Systems
Cable/Harness Tester
Accelerometer Measurements
Digital Signal Processing
Pin Configurations appear at end of data sheet.
Functional Diagram appears at end of data sheet.
Features
o 16-Bit Wide (MAX1165) and Byte Wide (MAX1166)
Parallel Interface
o High Speed: 165ksps Sample Rate
o Accurate: ±2LSB INL, 16 Bit No Missing Codes
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)
0.1µA (10ksps, External Reference)
o Small Footprint
28-Pin TSSOP Package (16-Bit Wide)
20-Pin TSSOP Package (Byte Wide)
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX1165ACUI* 0°C to +70°C 28 TSSOP
MAX1165BCUI
0°C to +70°C 28 TSSOP
MAX1165CCUI
0°C to +70°C 28 TSSOP
MAX1165AEUI* -40°C to +85°C 28 TSSOP
MAX1165BEUI* -40°C to +85°C 28 TSSOP
MAX1165CEUI* -40°C to +85°C 28 TSSOP
*Future product—contact factory for availability.
INL
±2
±2
±4
±2
±2
±4
Ordering Information continued at end of data sheet.
Typical Operating Circuit
+5V ANALOG +5V DIGITAL
0.1µF
ANALOG INPUT
AIN AVDD
0.1µF
DVDD
D0–D15
µP DATA
BUS
R/C
CS
RESET
MAX1165
EOC
REF
REFADJ
AGND DGND
0.1µF
4.7µF
________________________________________________________________ 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, 16-Bit Analog-to-Digital Converter
with Parallel Interface
Typical Operating Characteristics
(AVDD = DVDD = +5V, external reference = +4.096V, CREF = 4.7µF, CREFADJ = 0.1µF, TA = +25°C, unless otherwise noted.)
2.0
1.5
1.0
0.5
0
-0.5
-1.0
-1.5
-2.0
0
INL vs. OUTPUT CODE
16384 32768 49152
OUTPUT CODE
65536
2.0
1.5
1.0
0.5
0
-0.5
-1.0
-1.5
-2.0
0
DNL vs. OUTPUT CODE
16384 32768 49152
OUTPUT CODE
66536
IAVDD + IDVDD SUPPLY CURRENT
vs. SAMPLE RATE
10
1
0.1
0.01
0.001
0.0001
0.01
0.1 1 10 100
SAMPLE RATE (ksps)
1000
IAVDD + IDVDD SUPPLY CURRENT
vs. TEMPERATURE
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
-40 -20
SAMPLE RATE = 165ksps
0 20 40 60
TEMPERATURE (°C)
80
1000
800
600
400
200
0
-200
-400
-600
-800
-1000
-40
OFFSET ERROR
vs. TEMPERATURE
-20 0 20 40 60
TEMPERATURE (°C)
80
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
0.020
0.015
0.010
0.005
0
-0.005
-0.010
-0.015
-0.020
-40
GAIN ERROR
vs. TEMPERATURE
-20 0 20 40 60
TEMPERATURE (°C)
80
INTERNAL REFERENCE
vs. TEMPERATURE
4.136
4.126
4.116
4.106
4.096
4.086
4.076
4.066
4.056
-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, 16-Bit Analog-to-Digital Converter
with Parallel Interface
external reference to REFADJ, the input impedance is
typically 5kΩ. Using the buffered REFADJ input makes
buffering the external reference unnecessary; however,
the internal buffer output must be bypassed at REF with
a 1µF capacitor.
Connect REFADJ to AVDD to disable the internal buffer.
Directly drive REF using an external reference. During
conversion the external reference must be able to drive
100µA of DC load current and have an output imped-
ance of 10Ω or less. REFADJ’s impedance is typically
5kΩ. The DC input impedance of REF is a minimum
40kΩ.
For optimal performance, buffer the reference through
an op amp and bypass REF with a 1µF capacitor.
Consider the MAX1165/MAX1166s’ equivalent input
noise (38µVRMS) when choosing a reference.
Reading a 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–D15 are the parallel outputs of the MAX1165/
MAX1166. 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 tDO. Bringing CS high
forces the output bus back to high impedance. The
MAX1165/MAX1166 then wait for the next falling edge
of CS to start the next conversion cycle (Figure 2).
The MAX1165 loads the conversion result onto a 16-bit
wide data bus while the MAX1166 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
most significant byte is on the bus when HBEN is high
(Figure 2).
RESET
Toggle RESET with CS high. The next falling edge of CS
begins acquisition. This reset is an alternative to the
dummy conversion explained in the Starting a Conversion
section.
Transfer Function
Figure 8 shows the MAX1165/MAX1166 output transfer
function. The output is coded in standard binary.
Input Buffer
Most applications require an input buffer amplifier to
achieve 16-bit accuracy. If the input signal is multi-
OUTPUT CODE
11...111
11...110
11...101
FULL-SCALE
TRANSITION
FS = VREF
00...011
00...010
00...001
00...000
012 3
INPUT VOLTAGE (LSB) FS - 3/2LSB
1LSB = VREF
65536
FS
Figure 8. MAX1165/MAX1166 Transfer Function
plexed, the input channel should be switched immedi-
ately after acquisition, rather than near the end of or
after a conversion. 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 the required output volt-
age change before the beginning of the acquisition
time. At the beginning of acquisition, the internal sam-
pling capacitor array connects to AIN (the amplifier out-
put), 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 sampling
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 capaci-
tive 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
MAX1165
MAX1166
AIN
40pF
Figure 9. MAX1165/MAX1166 Fast Settling Input Buffer
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet MAX1166.PDF ] | |
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