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ADS7868IDBVRG4 Arkusz danych(PDF) 3 Page - Texas Instruments

Numer części ADS7868IDBVRG4
Szczegółowy opis  1.2-V, 12-/10-/8-BIT, 200-KSPS/100-KSPS, MICRO-POWER, MINIATURE ANALOG-TO-DIGITAL CONVERTER WITH SERIAL INTERFACE
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Producent  TI [Texas Instruments]
Strona internetowa  http://www.ti.com
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ADS7868IDBVRG4 Arkusz danych(HTML) 3 Page - Texas Instruments

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SPECIFICATIONS, ADS7866
ADS7866
ADS7867
ADS7868
SLAS465 – JUNE 2005
At –40
°C to 85°C, f
SAMPLE = 200 KSPS and fSCLK = 3.4 MHz if 1.6 V ≤ VDD ≤ 3.6 V; fSAMPLE = 100 KSPS and fSCLK = 1.7 MHz if
1.2 V
≤ V
DD < 1.6 V (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
SYSTEM PERFORMANCE
Resolution
12
Bits
No missing codes
12
Bits
Integral linearity
–1.5
1.5
LSB(1)
Differential linearity
–1
1.5
LSB
1.2 V
≤ V
DD < 1.6 V
–2
2
Offset error(2)
LSB
1.6 V
≤ V
DD ≤ 3.6 V
–3
3
1.2 V
≤ V
DD < 1.6 V
–2
2
Gain error(3)
LSB
1.6 V
≤ V
DD ≤ 3.6 V
–2
2
1.2 V
≤ V
DD < 1.6 V
–2.5
2.5
Total unadjusted error(4)
LSB
1.6 V
≤ V
DD ≤ 3.6 V
–3.5
3.5
SAMPLING DYNAMICS (See Timing Characteristics Section)
tCONVERT
Conversion time
fSCLK = 3.4 MHz, 13 SCLK cycles
3.82
µs
tSAMPLE
Acquisition time
fSCLK = 3.4 MHz, 1.6 V ≤ VDD ≤ 3.6 V
0.64
µs
fSAMPLE
Throughput rate
fSCLK = 3.4 MHz, 1.6 V ≤ VDD ≤ 3.6 V
200
KSPS
Aperture delay
10
ns
Aperture jitter
40
ps
DYNAMIC CHARACTERISTICS
fIN = 30 kHz, 1.2 V ≤ VDD < 1.6 V
68
Signal-to-noise
SINAD
dB
and distortion
fIN = 30 kHz, 1.6 V ≤ VDD ≤ 3.6 V
69
70
fIN = 30 kHz, 1.2 V ≤ VDD < 1.6 V
70
SNR
Signal-to-noise ratio
dB
fIN = 30 kHz, 1.6 V ≤ VDD ≤ 3.6 V
70
71
fIN = 30 kHz, 1.2 V ≤ VDD < 1.6 V
–70
THD
Total harmonic distortion(5)
dB
fIN = 30 kHz, 1.6 V ≤ VDD ≤ 3.6 V
–83
fIN = 30 kHz, 1.2 V ≤ VDD < 1.6 V
75
Spurious free dynamic
SFDR
dB
range
fIN = 30 kHz, 1.6 V ≤ VDD ≤ 3.6 V
85
At 0.1 dB, 1.2 V
≤ V
DD < 1.6 V
2
At 0.1 dB, 1.6 V
≤ V
DD ≤ 3.6 V
4
Full-power bandwidth(6)
MHz
At 3 dB, 1.2 V
≤ V
DD < 1.6 V
3
At 3 dB, 1.6 V
≤ V
DD ≤ 3.6 V
8
ANALOG INPUT
Full-scale input span(7)
VIN – GND
0
VDD
V
CS
Input capacitance
12
pF
Input leakage current
–1
1
µA
DIGITAL INPUT
Logic family , CMOS
1.2 V
≤ V
DD < 1.6 V
0.7
×V
DD
3.6
1.6 V
≤ V
DD < 1.8 V
0.7
×V
DD
3.6
VIH
Input logic high level
V
1.8 V
≤ V
DD < 2.5 V
0.7
×V
DD
3.6
2.5 V
≤ V
DD ≤ 3.6 V
2
3.6
(1)
LSB = Least Significant BIt
(2)
The difference in the first code transition 000...000 to 000...001 from the ideal value of GND + 1 LSB.
(3)
The difference in the last code transition 011...111 to 111...111 from the ideal value of VDD - 1 LSB with the offset error removed.
(4)
The absolute difference from the ideal transfer function of the converter. This specification is similar to INL error except the effects of
offset error and gain error are included.
(5)
The 2nd through 10th harmonics are used to determine THD.
(6)
Input frequency where the amplitude of the digitized signal has decreased by 0.1 dB or 3 dB.
(7)
Ideal input span which does not include gain or offset errors.
3


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