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ADS8887 Arkusz danych(PDF) 4 Page - Texas Instruments

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Numer części ADS8887
Szczegółowy opis  18-Bit, 100-kSPS, Serial Interface, microPower, Miniature, True-Differential Input, SAR Analog-to-Digital Converter
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Strona internetowa  http://www.ti.com
Logo TI - Texas Instruments

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ADS8887
SBAS613A – MAY 2013 – REVISED DECEMBER 2013
www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
All minimum and maximum specifications are at TA = –40°C to +85°C, AVDD = 3 V, DVDD = 3 V, VREF = 5 V,
VCM = VREF / 2 V, and fSAMPLE = 100 kSPS, unless otherwise noted.
Typical specifications are at TA = +25°C, AVDD = 3 V, and DVDD = 3 V.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
DYNAMIC CHARACTERISTICS
At 1 kHz, VREF = 5 V
98
99.9
dB
SINAD
Signal-to-noise + distortion(6)
At 10 kHz, VREF = 5 V
98.7
dB
At 49 kHz, VREF = 5 V
93.3
dB
At 1 kHz, VREF = 5 V
98.5
100
dB
SNR
Signal-to-noise ratio(6)
At 10 kHz, VREF = 5 V
99.5
dB
At 49 kHz, VREF = 5 V
93.5
dB
At 1 kHz, VREF = 5 V
–115
dB
THD
Total harmonic distortion(6)(7)
At 10 kHz, VREF = 5 V
–112
dB
At 49 kHz, VREF = 5 V
–102
dB
At 1 kHz, VREF = 5 V
115
dB
SFDR
Spurious-free dynamic range(6)
At 10 kHz, VREF = 5 V
112
dB
At 49 kHz, VREF = 5 V
102
dB
BW–3dB –3-dB small-signal bandwidth
30
MHz
EXTERNAL REFERENCE INPUT
VREF
Input range
2.5
5
V
Reference input current
During conversion, 100-kHz sample rate, mid-code
35
μA
Reference leakage current
250
nA
Decoupling capacitor at the REF
CREF
10
22
µF
input
POWER-SUPPLY REQUIREMENTS
AVDD
Analog supply
2.7
3
3.6
V
Power-supply
voltage
DVDD
Digital supply range
1.65
1.8
3.6
V
Supply current
AVDD
100-kHz sample rate, AVDD = 3 V
0.23
0.4
mA
100-kHz sample rate, AVDD = 3 V
0.7
1.2
mW
PVA
Power dissipation
10-kHz sample rate, AVDD = 3 V
70
μW
IAPD
Device power-down current(8)
50
nA
DIGITAL INPUTS: LOGIC FAMILY (CMOS)
1.65 V < DVDD < 2.3 V
0.8 × DVDD
DVDD + 0.3
V
VIH
High-level input voltage
2.3 V < DVDD < 3.6 V
0.7 × DVDD
DVDD + 0.3
V
1.65 V < DVDD < 2.3 V
–0.3
0.2 × DVDD
V
VIL
Low-level input voltage
2.3 V < DVDD < 3.6 V
–0.3
0.3 × DVDD
V
ILK
Digital input leakage current
±10
±100
nA
DIGITAL OUTPUTS: LOGIC FAMILY (CMOS)
VOH
High-level output voltage
IO = 500-μA source, CLOAD = 20 pF
0.8 × DVDD
DVDD
V
VOL
Low-level output voltage
IO = 500-μA sink, CLOAD = 20 pF
0
0.2 × DVDD
V
TEMPERATURE RANGE
TA
Operating free-air temperature
–40
+85
°C
(6)
All specifications expressed in decibels (dB) refer to the full-scale input (FSR) and are tested with an input signal 0.5 dB below full-scale,
unless otherwise specified.
(7)
Calculated on the first nine harmonics of the input frequency.
(8)
The device automatically enters a power-down state at the end of every conversion, and remains in power-down during the acquisition
phase.
4
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Copyright © 2013, Texas Instruments Incorporated
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