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PDF ADS8472 Data sheet ( Hoja de datos )
| Número de pieza | ADS8472 | |
| Descripción | MICROPOWER SAMPLING ANALOG-TO-DIGITAL CONVERTER | |
| Fabricantes | Burr-Brown | |
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BurrĆBrown Products
from Texas Instruments
ADS8472
SLAS514 – DECEMBER 2006
16-BIT, 1-MSPS, PSEUDO-BIPOLAR, FULLY DIFFERENTIAL INPUT, MICROPOWER
SAMPLING ANALOG-TO-DIGITAL CONVERTER WITH PARALLEL INTERFACE,
REFERENCE
FEATURES
APPLICATIONS
• 0 to 1-MHz Sample Rate
• ±0.4 LSB Typ, ±0.65 LSB Max INL
• ±0.3 LSB Typ, ±0.5 LSB Max DNL
• 16-Bit NMC Ensured Over Temperature
• ±0.1-mV Offset Error
• Medical Instruments
• Optical Networking
• Transducer Interface
• High Accuracy Data Acquisition Systems
• Magnetometers
• ±0.05-PPM/°C Offset Error Drift
• ±0.035 %FSR Gain Error
• ±0.4-PPM/°C Gain Error Drift
• 95dB SNR, -120dB THD, 123dB SFDR
• Zero Latency
• Low Power: 225 mW at 1 MSPS
• Unipolar Differential Input Range: Vref to –Vref
• Onboard Reference with 6 PPM/°C Drift
• Onboard Reference Buffer
• High-Speed Parallel Interface
DESCRIPTION
The ADS8472 is an 16-bit, 1-MSPS A/C converter
with an internal 4.096-V reference and a
pseudo-bipolar, fully differential input. The device
includes a 16-bit capacitor-based SAR A/D converter
with inherent sample and hold. The ADS8472 offers
a full 16-bit interface or an 8-bit bus option using two
read cycles.
The ADS8472 is available in a 48-lead 7x7 QFN
package and is characterized over the industrial
–40°C to 85°C temperature range.
• Wide Digital Supply 2.7 V to 5.25 V
• 8-/16-Bit Bus Transfer
• 48-Pin 7x7 QFN Package
HIGH SPEED SAR CONVERTER FAMILY
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
500 kHz
ADS8383
ADS8327
ADS8328
~600 kHz
ADS8381
ADS8380 (s)
ADS8382 (s)
ADS8370 (s)
ADS8372 (s)
750 kHz
ADS8371
1 MHz
ADS8481
ADS8482
ADS8471
ADS8472
ADS7886
1.25 MHz
2 MHz
3 MHz
4MHz
ADS8401
ADS8405
ADS8402
ADS8406
ADS7890 (s)
ADS8411
ADS8410 (s)
ADS8412
ADS8413 (s)
ADS7883
ADS7891
ADS8422
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 DA TA
Output Bus
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
1 page  
ADS8472
www.ti.com
SLAS514 – DECEMBER 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
VOLTAGE REFERENCE INPUT
Reference voltage at REFIN, Vref
Reference resistance(1)
3.0 4.096 +VA – 0.8
500
Reference current drain
INTERNAL REFERENCE OUTPUT
fs = 1 MHz
1
Internal reference start-up time
From 95% (+VA), with 1-µF storage capacitor
120
Reference voltage range, Vref
Source current
IO = 0
Static load
4.081 4.096
4.111
10
Line regulation
+VA = 4.75 V ~ 5.25 V
60
Drift
DIGITAL INPUT/OUTPUT
IO = 0
±6
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
POWER SUPPLY REQUIREMENTS
Power supply
voltage
+VBD
+VA
2.7
4.75
3.3
5
5.25
5.25
Supply current(2)
Power dissipation(2)
TEMPERATURE RANGE
fs = 1 MHz
fs = 1 MHz
45 50
225 250
Operating free-air
–40 85
UNIT
V
kΩ
mA
ms
V
µA
µV
PPM/°C
V
V
V
mA
mW
°C
(1) Can vary ±20%
(2) This includes only +VA current. +VBD current is typical 1 mA with 5 pF load capacitance on all output pins.
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TYPICAL CHARACTERISTICS (continued)
ADS8472
SLAS514 – DECEMBER 2006
OFFSET ERROR
vs
REFERENCE VOLTAGE
0.100
0.080
0.060
0.040
TA = 25 °C,
fs = 1 MSPS,
VDD = 5 V
0.020
0
-0.020
-0.040
-0.060
-0.080
-0.100
3
3.2 3.4 3.6 3.8
Reference Voltage - V
4
Figure 16.
4.2
GAIN ERROR
vs
REFERENCE VOLTAGE
0.1
0.08
0.06
0.04
VDD = 5 V,
TA = 25°C,
fs = 1 MSPS
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 19.
4.2
TOTAL HARMONIC DISTORTION
vs
REFERENCE VOLTAGE
-119
-120
+VA = 5 V,
+VBD = 5 V,
fs = 1 MSPS,
TA = 25°C,
fi = 2 kHz
-121
-122
3
3.2 3.4 3.6 3.8 4
Vref - Reference Voltage - V
Figure 22.
4.2
-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 17.
5.25
GAIN ERROR
vs
FREE-AIR TEMPERATURE
-0.03
-0.032
+VA = 5 V,
+VBD = 5 V,
fs = 1 MSPS,
Vref = 4.096 V
-0.034
-0.036
-0.038
-0.04
-40
-25 -10 5 20 35 50 65
TA - Free-Air Temperature - °C
80
Figure 18.
OFFSET ERROR TEMPERATURE
DRIFT DISTRIBUTION (35 Samples)
14
+VA = 5 V,
12
+VBD = 5 V,
fi = 1 MSPS,
10 Vref = 4.096 V
13
11
8
6
4
3
44
2
0
0
0.01
0.03 0.04 0.05 0.07
Offset Drift - ppm/C
0.08
Figure 20.
SIGNAL-TO-NOISE RATIO
vs
REFERENCE VOLTAGE
95.4
95.2
95
94.8
+VA = 5 V,
+VBD = 5 V,
fs = 1 MSPS,
TA = 25°C,
fi = 2 kHz
94.6
94.4
94.2
94
93.8
3
3.2 3.4 3.6 3.8 4
Vref - Reference Voltage - V
Figure 23.
4.2
GAIN ERROR TEMPERATURE
DRIFT DISTRIBUTION (35 Samples)
10
9
9
+VA = 5 V,
+VBD = 5 V,
8
8 fi = 1 MSPS,
7 Vref = 4.096 V
7
6
6
5
4
3
2
1
1
0
0.03
4
0.19 0.35 0.50 0.66
Gain Error Drift - ppm/C
0.90
Figure 21.
SIGNAL-TO-NOISE + DISTORTION
vs
REFERENCE VOLTAGE
95.4
95.2
95
94.8
+VA = 5 V,
+VBD = 5 V,
fs = 1 MSPS,
TA = 25°C,
fi = 2 kHz
94.6
94.4
94.2
94
93.8
3
3.2 3.4 3.6 3.8 4
Vref - Reference Voltage - V
Figure 24.
4.2
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| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet ADS8472.PDF ] | |
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