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PDF ADS8326 Data sheet ( Hoja de datos )
| Número de pieza | ADS8326 | |
| Descripción | microPower Sampling | |
| Fabricantes | Burr-Brown | |
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BurrĆBrown Products
from Texas Instruments
ADS8326
16-Bit, High-Speed, 2.7V to 5.5V microPower Sampling
ANALOG-TO-DIGITAL CONVERTER
SBAS343 – MAY 2007
FEATURES
• 16 Bits No Missing Codes (Full-Supply Range,
High or Low Grade)
• Very Low Noise: 3LSBPP
• Excellent Linearity:
±1LSB typ, ±1.5LSB max INL
±0.6LSB typ, ±1LSB max DNL
±1mV max Offset
±12LSB typ Gain Error
• microPower:
10mW at 5V, 250kHz
4mW at 2.7V, 200kHz
2mW at 2.7V, 100kHz
0.2mW at 2.7V, 10kHz
• MSOP-8 Package
(SON-8 package available Q4, 2007; package
size same as 3x3 QFN)
• 16-Bit Upgrade to the 12-Bit ADS7816 and
ADS7822
• Pin-Compatible with the ADS7816, ADS7822,
ADS7826, ADS7827, ADS7829, ADS8320, and
ADS8325
• Serial (SPI™/SSI) Interface
APPLICATIONS
• Battery-Operated Systems
• Remote Data Acquisition
• Isolated Data Acquisition
• Simultaneous Sampling, Multichannel
Systems
• Industrial Controls
• Robotics
• Vibration Analysis
DESCRIPTION
The ADS8326 is a 16-bit, sampling, analog-to-digital
(A/D) converter specified for a supply voltage range
from 2.7V to 5.5V. It requires very little power, even
when operating at the full data rate. At lower data
rates, the high speed of the device enables it to
spend most of its time in the power-down mode. For
example, the average power dissipation is less than
0.2mW at a 10kHz data rate.
The ADS8326 offers excellent linearity and very low
noise and distortion. It also features a synchronous
serial (SPI/SSI-compatible) interface and a
differential input. The reference voltage can be set to
any level within the range of 0.1V to VDD.
Low power and small size make the ADS8326 ideal
for portable and battery-operated systems. It is also
a perfect fit for remote data-acquisition modules,
simultaneous multichannel systems, and isolated
data acquisition. The ADS8326 is available in an
MSOP-8 package.
REF
+IN
-IN
SAR
ADS8326
S/H Amp
CDAC
Comparator
Serial
Interface
DOUT
DCLOCK
CS/SHDN
.www
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.
SPI is a trademark of Motorola, Inc.
All other trademarks are the property of their respective owners.
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 © 2007, Texas Instruments Incorporated
1 page  
ADS8326
www.ti.com
SBAS343 – MAY 2007
ELECTRICAL CHARACTERISTICS: VDD = +2.7V
At –40°C to +85°C, VREF = +2.5V, –IN = GND, fSAMPLE = 200kHz, and fDCLOCK = 24 × fSAMPLE, unless otherwise noted.
ADS8326I
ADS8326IB
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX UNIT
ANALOG INPUT
Full-scale range
FSR +IN – (–IN)
Operating common-mode signal
0
–0.3
VREF
0.5
0
–0.3
VREF
0.5
V
V
Input resistance
–IN = GND, off
RON –IN = GND, on
5
100 150
5 GΩ
100 150 Ω
Input capacitance
–IN = GND, during sampling
48
48 pF
Input leakage current
–IN = GND
±50 ±50 nA
Differential input capacitance
+IN to –IN, during sampling
20
20 pF
Full-power bandwidth
FSBW
FS sinewave, SINAD =
–60dB
60
60 kHz
DC ACCURACY
Resolution
16 16 Bits
No missing code
NMC
16 16 Bits
Integral linearity error
INL
–3 ±2 +3 –2.5 ±1 +2.5 LSB
Differential linearity error
DNL
–1 ±0.5 +2 –1 ±0.4 +1 LSB
Offset error
Offset error drift
Gain error
Gain error drift
Noise
VOS
TCVOS
GERR
TCGERR
–1.5
±0.75
±0.2
±33
±0.3
30
+1.5
–1 ±0.5
±0.2
±16
±0.3
30
+1 mV
ppm/°C
LSB
ppm/°C
µVRMS
Power-supply rejection
SAMPLING DYNAMICS
2.7V ≤ VDD ≤ 3.6V
0.5
0.5 LSB
Conversion time
(16 DCLOCKs)
tCONV 24kHz ≤ fDCLOCK ≤ 4.8MHz
3.333
666.7
3.333
666.7
µs
Acquisition time
(4.5 DCLOCKs)
tAQ fDCLOCK = 4.8MHz
0.9375
0.9375
µs
Throughput rate
(22 DCLOCKs)
200 200 kSPS
Clock frequency
AC ACCURACY
fDCLOCK
0.024
4.8 0.024
4.8 MHz
Total harmonic distortion
THD 2.5VPP sinewave at 2kHz
2.5VPP sinewave at 10kHz
Spurious-free dynamic
range
2.5VPP sinewave at 2kHz
SFDR
2.5VPP sinewave at 10kHz
Signal-to-noise ratio
SNR 2.5VPP sinewave at 2kHz
2.5VPP sinewave at 10kHz
Signal-to-noise + distortion
2.5VPP sinewave at 2kHz
SINAD
2.5VPP sinewave at 10kHz
Effective number of bits
ENOB 2.5VPP sinewave at 2kHz
2.5VPP sinewave at 10kHz
VOLTAGE REFERENCE INPUT
–88
–75
91
77.5
86.5
86
85
74.5
13.86
12.12
–88.5
–75.5
91.5
78
87
86.5
85.5
75
13.94
12.20
dB
dB
dB
dB
dB
dB
dB
dB
Bits
Bits
Reference voltage
Reference input resistance
Reference input capacitance
CS = GND, fSAMPLE = 0Hz
CS = VDD
0.1 VDD 0.1 VDD V
5 5 GΩ
5 5 GΩ
24 24 pF
Reference input current
fS = 200kHz
fS = 100kHz
fS = 10kHz
CS = VDD
70 90
25 33
57
0.1
70 90 µA
25 33 µA
5 7 µA
0.1 µA
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5
5 Page 
ADS8326
.www
www.ti.com
TYPICAL CHARACTERISTICS: VDD = +5V (continued)
At TA = +25°C, VDD = +5V, VREF = +5V. fSAMPLE = 250kHz, fCLK = 24 × fSAMPLE, unless otherwise noted.
SBAS343 – MAY 2007
FREQUENCY SPECTRUM
(8192 point FFT, fIN = 1.9836kHz, –0.2dB)
0
-20
-40
-60
-80
-100
-120
-140
-160
0
25 50 75 100
Frequency (kHz)
Figure 8.
125
FREQUENCY SPECTRUM
(8192 point FFT, fIN = 9.9792kHz, –0.2dB)
0
-20
-40
-60
-80
-100
-120
-140
-160
0
25 50 75 100
Frequency (kHz)
Figure 9.
125
100
95
90
85
80
75
70
65
1
SIGNAL-TO-NOISE AND
SIGNAL-TO-NOISE + DISTORTION
vs INPUT FREQUENCY
SNR
SINAD
10
Frequency (kHz)
Figure 10.
100 200
SPURIOUS-FREE DYNAMIC RANGE AND
TOTAL HARMONIC DISTORTION
vs INPUT FREQEUNCY
105 -105
100 SFDR -100
95 -95
90 -90
85 -85
THD(1)
80 -80
75 -75
70
NOTE: (1) First nine harmonics of the input frequency.
65
1 10 100
-70
-65
200
Frequency (kHz)
Figure 11.
16.0
15.0
14.0
13.0
12.0
11.0
10.0
1
EFFECTIVE NUMBER OF BITS
vs INPUT FREQUENCY
10
Frequency (kHz)
Figure 12.
100 200
CHANGE IN SIGNAL-TO-NOISE + DISTORTION
vs TEMPERATURE
0.25
0.20
fIN = 1.98364kHz, -0.2dB
0.15
0.10
0.05
0
-0.05
-0.10
-0.15
-0.20
-50
-25
0 25 50
Temperature (°C)
75 100
Figure 13.
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11
11 Page | ||
| Páginas | Total 31 Páginas | |
| PDF Descargar | [ Datasheet ADS8326.PDF ] | |
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