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ADS7949 Arkusz danych(PDF) 7 Page - Texas Instruments

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Numer części ADS7949
Szczegółowy opis  12/10/8-Bit, 2MSPS, Dual-Channel, Unipolar, Pseudo-Differential, Ultralow-Power SAR Analog-to-Digital Converters
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Producent  TI1 [Texas Instruments]
Strona internetowa  http://www.ti.com
Logo TI1 - Texas Instruments

ADS7949 Arkusz danych(HTML) 7 Page - Texas Instruments

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ADS7947
ADS7948
ADS7949
www.ti.com
SLAS708 – SEPTEMBER 2010
ELECTRICAL CHARACTERISTICS: ADS7949 (8-Bit)
Minimum/maximum specifications at AVDD = 2.7V to 5.5V, DVDD = 1.65V to AVDD, TA = –40°C to +125°C, and
fSAMPLE = 2MSPS, unless otherwise noted. Typical specifications at AVDD = 3V, DVDD = 1.8V, TA = +25°C, and fSAMPLE =
2MSPS.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
ANALOG INPUT
Full-scale input span(1)
AINxP – AINxN
0
VREF
V
AIN0P, AIN1P
–0.2
AVDD + 0.2
V
Absolute input range
AIN0N, AIN1N
–0.2
0.2
V
Input capacitance(2)
32
pF
Input leakage current
At +125°C
1.5
nA
SYSTEM PERFORMANCE
Resolution
8
Bits
No missing codes
8
Bits
Integral linearity
–0.3
±0.06
0.3
LSB(3)
Differential linearity
–0.3
±0.06
0.3
LSB
Offset error(4)
–0.3
±0.06
0.3
LSB
Gain error
–0.3
±0.06
0.3
LSB
Transition noise
25
µVRMS
Power-supply rejection
60
dB
SAMPLING DYNAMICS
Conversion time
8.5
SCLK
Acquisition time
80
ns
Maximum sample rate (throughput rate)
34MHz SCLK in 16-clock frame
2
MSPS
34MHz SCLK and CS low for 8.5 clocks
3
MSPS
Aperture delay
5
ns
Aperture jitter
10
ps
Step response
80
ns
Overvoltage recovery
80
ns
DYNAMIC CHARACTERISTICS
Total harmonic distortion (THD)(5)
100kHz
–80
dB
Signal-to-noise ratio (SNR)
100kHz
49
dB
Signal-to-noise and distortion ratio (SINAD)
100kHz
49
dB
Spurious-free dynamic range (SFDR)
100kHz
81
dB
Full-power bandwidth
At –3dB
15
MHz
DIGITAL INPUT/OUTPUT
Logic family
CMOS
VIH
0.7DVDD
V
VIL
0.3DVDD
V
Logic level
VOH
ISOURCE = 200µA
DVDD – 0.2
V
VOL
ISINK = 200µA
0.4
V
Input leakage current
IIH, IIL
0 <VIN < DVDD
±20
nA
External reference
2.5
AVDD
V
(1)
Ideal input span; does not include gain or offset error.
(2)
Refer to Figure 39 for sampling circuit details.
(3)
LSB means Least Significant Bit.
(4)
Measured relative to an ideal full-scale input.
(5)
Calculated on the first nine harmonics of the input frequency.
Copyright © 2010, Texas Instruments Incorporated
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