參數資料
型號： ADS7953SRHBT
廠商： TEXAS INSTRUMENTS INC
元件分類： ADC
英文描述： 16-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PQCC32
封裝： GREEN, PLASTIC, PQFP-32
文件頁數： 45/63頁
文件大小： 1734K
代理商： ADS7953SRHBT
www.ti.com
SLAS605A – JUNE 2008 – REVISED JANUARY 2010
ELECTRICAL CHARACTERISTICS, ADS7950/51/52/53
+VA = 2.7 V to 5.25 V, +VBD = 1.7 V to 5.25 V, Vref = 2.5 V ± 0.1 V, TA = -40°C to 125°C, fsample = 1 MHz (unless otherwise
noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
ANALOG INPUT
Range 1
0
Vref
Full-scale input span(1)
V
Range 2 while 2Vref
≤ +VA
0
2*Vref
–0.20
VREF
Range 1
+0.20
Absolute input range
V
–0.20
2*VREF
Range 2 while 2Vref
≤ +VA
+0.20
Input capacitance
15
rF
Input leakage current
TA = 125°C
61
nA
SYSTEM PERFORMANCE
Resolution
12
Bits
ADS795XSB (2)
12
No missing codes
Bits
ADS795XS(2)
11
ADS795XSB(2)
–1
±0.5
1
Integral linearity
LSB(3)
ADS795XS(2)
–1.5
±0.75
1.5
ADS795XSB(2)
–1
±0.5
1
Differential linearity
LSB
ADS795XS(2)
–2
±0.75
1.5
Offset error(4)
–3.5
±1.1
3.5
LSB
Range 1
–2
±0.2
2
Gain error
LSB
Range 2
±0.2
Total unadjusted error (TUE)
±2
LSB
SAMPLING DYNAMICS
Conversion time
20 MHz sclk
800
nSec
Acquisition time
325
nSec
Maximum throughput rate
20 MHz sclk
1.0
MHz
Aperture delay
5
nsec
Step response
150
nsec
Over voltage recovery
150
nsec
DYNAMIC CHARACTERISTICS
Total harmonic distortion(5)
100 kHz
–82
dB
Signal-to-noise ratio
100 kHz, ADS795XSB(2)
70
71.7
dB
100 kHz, ADS795XS(2)
70
71.7
Signal-to-noise + distortion
100 kHz, ADS795XSB(2)
69
71.3
dB
100 kHz, ADS795XS(2)
68
71.3
Spurious free dynamic range
100 kHz
84
dB
Small signal bandwidth
At –3 dB
47
MHz
Any off-channel with 100kHz, Full-scale input to
channel being sampled with DC input (isolation
–95
crosstalk).
Channel-to-channel crosstalk
dB
From previously sampled to channel with 100kHz,
Full-scale input to channel being sampled with DC
–85
input (memory crosstalk).
EXTERNAL REFERENCE INPUT
(1)
Ideal input span; does not include gain or offset error.
(2)
ADS795X, where X indicates 0, 1, 2, or 3
(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 2008–2010, Texas Instruments Incorporated
5
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