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PDF MAX1179 Data sheet ( Hoja de datos )

Número de pieza MAX1179
Descripción 16-Bit / 135ksps / Single-Supply ADCs with Bipolar Analog Input Range
Fabricantes Maxim Integrated 
Logotipo Maxim Integrated Logotipo



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No Preview Available ! MAX1179 Hoja de datos, Descripción, Manual

19-2675; Rev 1; 1/03
16-Bit, 135ksps, Single-Supply ADCs with
Bipolar Analog Input Range
General Description
The MAX1179/MAX1187/MAX1189 16-bit, low-power,
successive-approximation analog-to-digital converters
(ADCs) feature automatic power-down, a factory-
trimmed internal clock, and a 16-bit wide parallel inter-
face. The devices operate from a single +4.75V to
+5.25V analog supply and feature a separate digital
supply input for direct interface with +2.7V to +5.25V
digital logic.
The MAX1179 accepts a bipolar input voltage range of
±5V. The MAX1187 accepts an analog input voltage
range from 0 to +10V, while the MAX1189 accepts a
bipolar analog input voltage range of ±10V. All devices
consume only 23mW at a sampling rate of 135ksps
when using an external reference and 29mW when
using the internal +4.096V reference. AutoShutdown™
reduces supply current to 0.4mA at 10ksps. The
MAX1179/MAX1187/MAX1189 are ideal for high-perfor-
mance, battery-powered data-acquisition applications.
Excellent AC performance (THD = -100dB) and DC
accuracy (±2LSB INL) make the MAX1179/MAX1187/
MAX1189 ideal for industrial process control, instrumen-
tation, and medical applications.
The MAX1179/MAX1187/MAX1189 are available in a
28-pin TSSOP package and are fully specified over the
-40°C to +85°C extended temperature range and the
0°C to +70°C commercial temperature range.
Applications
Temperature Sensing and Monitoring
Industrial Process Control
I/O Modules
Data-Acquisition Systems
Precision Instrumentation
AutoShutdown is a trademark of Maxim Integrated Products, Inc.
Features
o Analog Input Voltage Range: ±10V, ±5V, or 0 to 10V
o 16-Bit Wide Parallel Interface
o Single +4.75V to +5.25V Analog Supply Voltage
o Interfaces with +2.7V to +5.25V Digital Logic
o ±2LSB INL (max)
o ±1LSB DNL (max)
o Low Supply Current (MAX1189)
5.3mA (External Reference)
6.2mA (Internal Reference)
5µA AutoShutdown Mode
o Small Footprint
28-Pin TSSOP Package
Pin Configuration
TOP VIEW
D8 1
D9 2
D10 3
D11 4
D12 5
D13 6
D14 7
D15 8
R/C 9
EOC 10
AVDD 11
AGND 12
AIN 13
AGND 14
MAX1179
MAX1187
MAX1189
TSSOP
28 D7
27 D6
26 D5
25 D4
24 D3
23 D2
22 D1
21 D0
20 DVDD
19 DGND
18 CS
17 RESET
16 REF
15 REFADJ
PART
TEMP RANGE
PIN-PACKAGE
MAX1179ACUI
0°C to +70°C
MAX1179BCUI
0°C to +70°C
Ordering Information continued at end of data sheet.
28 TSSOP
28 TSSOP
Ordering Information
INPUT VOLTAGE
RANGE
±5V
±5V
INL (LSB)
±2
±2
________________________________________________________________ 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




MAX1179 pdf
16-Bit, 135ksps, Single-Supply ADCs with
Bipolar Analog Input Range
Typical Operating Characteristics
(AVDD = DVDD = +5V, external reference = +4.096V, CREF = 10µF, CREFADJ = 0.1µF, VREFADJ = AVDD, CLOAD = 20pF, TA = TMIN to
TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Typical Application Circuit)
INL vs. CODE
2.5
2.0
1.5
1.0
0.5
0
-0.5
-1.0
-1.5
-2.0
-2.5
0 10000 20000 30000 40000 50000 60000
CODE
DNL vs. CODE
2.5
2.0
1.5
1.0
0.5
0
-0.5
-1.0
-1.5
-2.0
-2.5
0 10000 20000 30000 40000 50000 60000
CODE
SUPPLY CURRENT (AVDD + DVDD)
vs. TEMPERATURE
4.80
4.75
5.25V
4.70 5.0V
4.65 4.75V
4.60
4.55
4.50
4.45
4.40
-40 -20
fSAMPLE = 135ksps
SHUTDOWN MODE BETWEEN
CONVERSIONS
0 20 40 60 80
TEMPERATURE (°C)
SUPPLY CURRENT (AVDD + DVDD)
vs. SAMPLE RATE
10
1 STANDBY MODE
0.1
SHUTDOWN MODE
0.01
0.001
0.0001
0.01
0.1 1 10 100
SAMPLE RATE (ksps)
GAIN ERROR
vs. TEMPERATURE
0.20
0.15
0.10
0.05
0
-0.05
-0.10
-0.15
-0.20
-40 -20
0 20 40 60
TEMPERATURE (°C)
1000
80
SHUTDOWN CURRENT (AVDD + DVDD)
vs. TEMPERATURE
5.0
NO CONVERSIONS
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
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
OFFSET ERROR vs. TEMPERATURE
10
MAX1189
8
6
4
2
0
-2
-4
-6
-8
-10
-40 -20
0 20 40 60
TEMPERATURE (°C)
80
FFT AT 1kHz
0
fSAMPLE = 135ksps
-20
-40
-60
-80
-100
-120
-140
-160
-180
0
20 40
FREQUENCY (kHz)
60
_______________________________________________________________________________________ 5

5 Page





MAX1179 arduino
16-Bit, 135ksps, Single-Supply ADCs with
Bipolar Analog Input Range
OUTPUT CODE
11 . . . 1111
11 . . . 1110
11 . . . 1101
INPUT RANGE = -5V TO +5V
FULL-SCALE
TRANSITION
10 . . . 0001
10 . . . 0000
FULL-SCALE RANGE
(FSR) = +10V
01 . . . 1111
00 . . . 0011
1LSB = FSR x VREF
65536 x 4.096
00 . . . 0010
00 . . . 0001
00 . . . 0000
-32768 -32766
-32767 -32765
0
-1 +1
+32766 +32768
+32767
INPUT VOLTAGE (LSB)
Figure 8. MAX1179 Transfer Function
OUTPUT CODE
11 . . . 111
11 . . . 110
11 . . . 101
INPUT RANGE = 0 TO +10V
FULL-SCALE
TRANSITION
FULL-SCALE RANGE
(FSR) = +10V
00 . . . 011
00 . . . 010
00 . . . 001
00 . . . 000
0123
1LSB = FSR x VREF
65536 x 4.096
65534 65536
65535
INPUT VOLTAGE (LSB)
Figure 9. MAX1187 Transfer Function
OUTPUT CODE
11 . . . 1111
11 . . . 1110
11 . . . 1101
INPUT RANGE = -10V TO +10V
FULL-SCALE
TRANSITION
10 . . . 0001
10 . . . 0000
FULL-SCALE RANGE
(FSR) = +20V
01 . . . 1111
00 . . . 0011
1LSB = FSR x VREF
65536 x 4.096
00 . . . 0010
00 . . . 0001
00 . . . 0000
-32768 -32766
-32767 -32765
0
-1 +1
+32766 +32768
+32767
INPUT VOLTAGE (LSB)
Figure 10. MAX1189 Transfer Function
Transfer Function
Figures 8, 9, and 10 show the MAX1179/MAX1187/
MAX1189s output transfer functions. The MAX1179
and MAX1189 outputs are coded in offset binary, while
the MAX1187 is coded in standard binary.
Input Buffer
Most applications require an input buffer amplifier to
achieve 16-bit accuracy and prevent loading the
source. Switch the channels immediately after acquisi-
tion, rather than near the end of or after a conversion
when the input signal is multiplexed. 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 voltage change before the beginning of the
acquisition time. Figure 11 shows an example of this
circuit using the MAX427.
Figures 12a and 12b show how the MAX1179 and
MAX1189 analog input current varies depending on
whether the chip is operating or powered down. The
part is fully powered down between conversions if the
voltage at R/C is set high during the second falling
edge of CS. The input current abruptly steps to the
powered up value at the start of acquisition. This step
in the input current can disrupt the ADC input, depend-
ing on the driving circuits output impedance at high
frequencies. If the driving circuit cannot fully settle by
the end of acquisition time, the accuracy of the system
can be compromised. To avoid this situation, increase
the acquisition time, use a driving circuit that can settle
within tACQ, or leave the MAX1179/MAX1189 powered
up by setting the voltage at R/C low during the second
falling edge of CS.
Layout, Grounding, and Bypassing
For best performance, use printed circuit (PC) boards.
Do not run analog and digital lines parallel to each
other, and do not lay out digital signal paths under-
neath the ADC package. Use separate analog and dig-
ital ground planes with only one point connecting the
two ground systems (analog and digital) as close to the
device as possible.
Route digital signals far away from sensitive analog and
reference inputs. If digital lines must cross analog lines,
do so at right angles to minimize coupling digital noise
______________________________________________________________________________________ 11

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