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PDF MAX1178 Data sheet ( Hoja de datos )
| Número de pieza | MAX1178 | |
| Descripción | 16-Bit / 135ksps / Single-Supply ADCs with Bipolar Analog Input Range | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-2755; Rev 1; 8/03
16-Bit, 135ksps, Single-Supply ADCs with
Bipolar Analog Input Range
General Description
The MAX1178/MAX1188 16-bit, low-power, successive-
approximation analog-to-digital converters (ADCs) fea-
ture automatic power-down, a factory-trimmed internal
clock, and a byte-wide parallel interface. The devices
operate from a single +4.75V to +5.25V analog supply
and feature a separate digital supply input for direct
interface with a +2.7V to +5.25V digital logic.
The MAX1188 accepts a bipolar analog input voltage
range of ±10V, while the MAX1178 accepts a bipolar
analog input voltage range of ±5V. All devices consume
no more than 26.5mW at a sampling rate of 135ksps
when using an external reference, and 31mW when using
the internal +4.096V reference. AutoShutdown™ reduces
supply current to 0.4mA at 10ksps.
The MAX1178/MAX1188 are ideal for high-perfor-
mance, battery-powered, data-acquisition applications.
Excellent AC performance (THD = -100dB) and DC
accuracy (±2 LSB INL) make the MAX1178/MAX1188
ideal for industrial process control, instrumentation, and
medical applications.
The MAX1178/MAX1188 are available in a 20-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.
Features
o Byte-Wide Parallel Interface
o Analog Input Voltage Range: ±10V, ±5V
o Single +4.75V to +5.25V Analog Supply Voltage
o Interface with +2.7V to +5.25V Digital Logic
o ±2 LSB INL
o ±1 LSB DNL
o Low Supply Current (max)
2.9mA (External Reference)
3.8mA (Internal Reference)
5µA AutoShutdown Mode
o Small Footprint
o 20-Pin TSSOP Package
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
INPUT
VOLTAGE
RANGE (V)
MAX1178ACUP 0°C to +70°C 20 TSSOP
±5
MAX1178BCUP 0°C to +70°C 20 TSSOP
±5
MAX1178CCUP 0°C to +70°C 20 TSSOP
±5
MAX1178AEUP -40°C to +85°C 20 TSSOP
±5
MAX1178BEUP -40°C to +85°C 20 TSSOP
±5
MAX1178CEUP -40°C to +85°C 20 TSSOP
±5
Ordering Information continued at end of data sheet.
Applications
Temperature Sensing and Monitoring
Industrial Process Control
I/O Modules
Data-Acquisition Systems
Precision Instrumentation
Pin Configuration and Functional Diagram appear at end of
data sheet.
AutoShutdown is a trademark of Maxim Integrated Products, Inc.
Typical Operating Circuit
+5V ANALOG +5V DIGITAL
0.1µF
0.1µF
ANALOG INPUT
HIGH
BYTE
LOW
BYTE
AVDD
AIN
DVDD
D0–D7
OR
D8–D15
µP DATA
BUS
R/C
CS
HBEN
MAX1178
MAX1188 EOC
REF
REFADJ
AGND DGND
0.1µF
10µF
________________________________________________________________ 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  
16-Bit, 135ksps, Single-Supply ADCs with
Bipolar Analog Input Range
Typical Operating Characteristics
(Typical Operating Circuit, AVDD = DVDD = +5V, external reference = +4.096V, CREF = 10µF, CREFADJ = 0.1µF, VREFADJ = AVDD,
CLOAD = 20pF. Typical values are at TA = +25°C, unless otherwise noted.)
INL vs. CODE
MAX1178/88 toc01
2.5
2.0
1.5
1.0
0.5
0
-0.5
-1.0
-1.5
-2.0
-2.5
0 10,000 20,000 30,000 40,000 50,000 60,000
CODE
SUPPLY CURRENT (AVDD + DVDD)
vs. SAMPLE RATE
10
1
STANDBY MODE
0.1
SHUTDOWN MODE
0.01
0.001
0.0001
0.01
VAIN = 0V
0.1 1 10 100
SAMPLE RATE (ksps)
1000
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)
80
DNL vs. CODE
MAX1178/88 toc02
2.5
2.0
1.5
1.0
0.5
0
-0.5
-1.0
-1.5
-2.0
-2.5
0 10,000 20,000 30,000 40,000 50,000 60,000
CODE
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
SUPPLY CURRENT (AVDD + DVDD)
vs. TEMPERATURE
4.80
4.75 5.25V
4.70 5.0V
4.65
4.60
4.55
4.50
4.45
4.40
-40
4.75V
fSAMPLE = 135ksps
SHUTDOWN MODE
BETWEEN CONVERSIONS
-20 0 20 40 60
TEMPERATURE (°C)
80
OFFSET ERROR vs. TEMPERATURE
10
8
6
4
2
0
-2
MAX1178
-4
MAX1188
-6
-8
-10
-40 -20
0 20 40 60
TEMPERATURE (°C)
80
0
-20
-40
-60
-80
-100
-120
-140
-160
-180
0
FFT AT 1kHz
fSAMPLE = 131ksps
10 20 30 40 50 60
FREQUENCY (kHz)
_______________________________________________________________________________________ 5
5 Page 
16-Bit, 135ksps, Single-Supply ADCs with
Bipolar Analog Input Range
MAX1178
MAX1188
ANALOG
INPUT
AIN
MAX427
REF
Figure 10. MAX1178/MAX1188 Fast-Settling Input Buffer
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 10 shows an example of this circuit using
the MAX427.
Figures 11 and 12 show how the MAX1178/MAX1188
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, depending on the
driving circuit’s output impedance at high frequencies. If
the driving circuit cannot fully settle by the end of acqui-
sition, 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
MAX1178/MAX1188 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 boards. Do not
run analog and digital lines parallel to each other, and do
not lay out digital signal paths underneath the ADC pack-
age. Use separate analog and digital ground planes with
only one point connecting the two ground systems (ana-
log 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,
MAX1178
ANALOG INPUT CURRENT
vs. ANALOG INPUT VOLTAGE
1.5
1.0
0.5 SHUTDOWN
MODE
0
-0.5
STANDBY
-1.0 MODE
-1.5
-5.0
-2.5 0 2.5
ANALOG INPUT VOLTAGE (V)
Figure 11. MAX1178 Analog Input Current
5.0
MAX1188
ANALOG INPUT CURRENT
vs. ANALOG INPUT VOLTAGE
1.5
1.0
0.5 SHUTDOWN
MODE
0
-0.5 STANDBY
MODE
-1.0
-1.5
-10
-5 0 5
ANALOG INPUT VOLTAGE (V)
10
Figure 12. MAX1188 Analog Input Current
do so at right angles to minimize coupling digital noise
onto the analog lines. If the analog and digital sections
share the same supply, isolate the digital and analog
supply by connecting them with a low-value (10Ω)
resistor or ferrite bead.
The ADC is sensitive to high-frequency noise on the
AVDD supply. Bypass AVDD to AGND with a 0.1µF
capacitor in parallel with a 1µF to 10µF low-ESR capaci-
tor with the smallest capacitor closest to the device.
Keep capacitor leads short to minimize stray inductance.
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet MAX1178.PDF ] | |
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