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PDF ADS8481 Data sheet ( Hoja de datos )
| Número de pieza | ADS8481 | |
| Descripción | MICROPOWER SAMPLING ANALOG-TO-DIGITAL CONVERTER | |
| Fabricantes | Burr-Brown Corporation | |
| Logotipo |  |
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BurrĆBrown Products
from Texas Instruments
ADS8481
SLAS385A – FEBRUARY 2006 – REVISED MARCH 2006
18-BIT, 1-MSPS, PSEUDO-DIFFERENTIAL UNIPOLAR INPUT, MICROPOWER SAMPLING
ANALOG-TO-DIGITAL CONVERTER WITH PARALLEL INTERFACE AND REFERENCE
FEATURES
• 0 to 1 MSPS Sampling Rate
• 18-Bit NMC Ensured Over Temperature
• Low ±0.1 mV Offset Error
• Low 0.2 ppm/°C Offset Error Temperature
Drift
• Low 0.6 ppm/°C Gain Error Temperature Drift
• Zero Latency
• Low Power: 220 mW at 1 MSPS
• Unipolar Single-Ended Input Range: 0 V to
Vref
• Onboard Reference
• Onboard Reference Buffer
• High-Speed Parallel Interface
• Wide Digital Supply 2.7 V ~ 5.25 V
• 8-/16-/18-Bit Bus Transfer
• 7x7 QFN Package
APPLICATIONS
• Medical Instruments
• Optical Networking
• Transducer Interface
• High Accuracy Data Acquisition Systems
• Magnetometers
DESCRIPTION
The ADS8481 is an 18-bit, 1-MSPS A/D converter
with an internal 4.096-V reference and a
pseudo-differential unipolar single-ended input. The
device includes a 18-bit capacitor-based SAR A/D
converter with inherent sample and hold. The
ADS8481 offers a full 18-bit interface, a 16-bit option
where data is read using two read cycles, or an 8-bit
bus option using three read cycles.
The ADS8481 is available in a 7x7 QFN package
and is characterized over the industrial –40°C to
85°C temperature range.
TYPE/SPEED
18-Bit Pseudo-Diff
18-Bit Pseudo-Bipolar, Fully Diff
16-Bit Pseudo-Diff
16-Bit Pseudo-Bipolar, Fully Diff
14-Bit Pseudo-Diff
12-Bit Pseudo-Diff
HIGH SPEED SAR CONVERTER FAMILY
500 kHz
ADS8383
580 kHz
ADS8381
ADS8380(S)
ADS8382(S)
750 kHz
ADS8371
1 MHz
ADS8481
ADS8482
ADS8471
ADS8472
ADS7886
1.25 MHz
ADS8401
ADS8405
ADS8402
ADS8406
ADS7890 (s)
2 MHz
ADS8411
ADS8412
ADS7883
3 MHz
ADS7891
4MHz
ADS7881
REFOUT
+IN
−IN
REFIN
+
_ CDAC
4.096-V
Internal
Reference
SAR
Comparator
Clock
Output
Latches
and
3-State
Drivers
Conversion
and
Control Logic
BYTE
16-/8-Bit
Parallel DATA
Output Bus
BUS 18/16
CONVST
BUSY
CS
RD
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2006, Texas Instruments Incorporated
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ADS8481
www.ti.com
SLAS385A – FEBRUARY 2006 – REVISED MARCH 2006
SPECIFICATIONS (Continued)
TA = –40°C to 85°C, +VA = 5 V, +VBD = 3 V or 5 V, Vref = 4.096 V, fSAMPLE = 1 MSPS (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN TYP
MAX UNIT
INTERNAL REFERENCE OUTPUT
Internal reference start-up time
From 95% (+VA), with 1-µF storage capacitor
120 ms
Reference voltage range, Vref
Source current
IO = 0 A
Static load
4.081 4.096
4.111
10
V
µA
Line regulation
+VA = 4.75 V to 5.25 V
60 µV
Drift
DIGITAL INPUT/OUTPUT
IO = 0 A
±6 PPM/C
Logic family – CMOS
VIH
Logic level
VIL
VOH
VOL
Data format – Straight Binary
IIH = 5 µA
IIL = 5 µA
IOH = 2 TTL loads
IOL = 2 TTL loads
+VBD–1
–0.3
+VBD– 0.6
+VBD +0.3
0.8
0.4
V
POWER SUPPLY REQUIREMENTS
Power supply +VBD
voltage
+VA
2.7 3.3
4.75 5
5.25 V
5.25 V
Supply current(1)
Power dissipation(1)
TEMPERATURE RANGE
fs = 1 MHz
fs = 1 MHz
44 48 mA
220 240 mW
Operating free-air
–40 85 °C
(1) This includes only +VA current. +VBD current is typical 1 mA with 5 pF load capacitance on all output pins.
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ADS8481
SLAS385A – FEBRUARY 2006 – REVISED MARCH 2006
TYPICAL CHARACTERISTICS (continued)
INTEGRAL NONLINEARITY
vs
SUPPLY VOLTAGE
4
3
2
+VA = 5 V,
1 +VBD = 5 V,
TA = 25°C
0 fi = 1 MSPS,
Vref = 4.096 V
-1
-2
Max
Min
-3
-4
4.75
4.85 4.95 5.05 5.15
Supply Voltage - V
Figure 10.
5.25
OFFSET ERROR
vs
FREE-AIR TEMPERATURE
0
-0.01
-0.02
-0.03
-0.04
-0.05
-0.06
-0.07
-0.08
-0.09
+VA = 5 V,
+VBD = 5 V,
fi = 1 MSPS,
Vref = 4.096 V
-0.1
-40 -25 -10 5 20 35 50 65 80
TA - Free-Air Temperature - °C
Figure 13.
-0.01
-0.02
-0.03
GAIN ERROR
vs
SUPPLY VOLTAGE
TA = 25°C,
fi = 1 MSPS,
Vref = 4.096
-0.04
-0.05
-0.06
-0.07
-0.08
4.75
4.85 4.95 5.05 5.15
Supply Voltage - V
Figure 16.
5.25
DIFFERENTIAL NONLINEARITY
vs
REFERENCE VOLTAGE
1.5
VDD = 5 V,
TA = 25°C
1 fi = 1 MSPS
Max
0.5
0
Min
-0.5
-1
3 3.2 3.4 3.6 3.8 4 4.2
Reference Voltage - V
Figure 11.
OFFSET ERROR
vs
SUPPLY VOLTAGE
0
-0.01
-0.02
-0.03
TA = 25°C,
fi = 1 MSPS,
Vref = 4.096 V
-0.04
-0.05
-0.06
-0.07
-0.08
-0.09
-0.1
4.75
4.85 4.95 5.05 5.15
Supply Voltage - V
Figure 14.
5.25
GAIN ERROR
vs
FREE-AIR TEMPERATURE
-0.02
-0.025
-0.03
-0.035
+VA = 5 V,
+VBD = 5 V,
fi = 1 MSPS,
Vref = 4.096 V
-0.04
-0.045
-0.05
-0.055
-0.06
-0.065
-0.07
-40 -25 -10 5 20 35 50 65
TA - Free-Air Temperature - °C
80
Figure 17.
INTEGRAL NONLINEARITY
vs
REFERENCE VOLTAGE
4 VDD = 5 V,
3 TA = 25°C
fi = 1 MSPS
2
Max
1
0
-1 Min
-2
-3
-4
3 3.2 3.4 3.6 3.8 4 4.2
Reference Voltage - V
Figure 12.
OFFSET ERROR
vs
REFERENCE VOLTAGE
0
VDD = 5 V,
-0.01 TA = 25°C,
-0.02 fi = 1 MSPS
-0.03
-0.04
-0.05
-0.06
-0.07
-0.08
-0.09
-0.1
3
3.2 3.4 3.6 3.8 4
Reference Voltage - V
4.2
Figure 15.
GAIN ERROR
vs
REFERENCE VOLTAGE
0.1
0.08
VDD = 5 V,
TA = 25°C,
0.06 fi = 1 MSPS
0.04
0.02
0
-0.02
-0.04
-0.06
-0.08
-0.1
3
3.2 3.4 3.6 3.8
4
Reference Voltage - V
Figure 18.
4.2
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| PDF Descargar | [ Datasheet ADS8481.PDF ] | |
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