Datasheet
ADS7950, ADS7951, ADS7952, ADS7953
ADS7954, ADS7955, ADS7956, ADS7957
ADS7958, ADS7959, ADS7960, ADS7961
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, V
ref
= 2.5 V ± 0.1 V, T
A
= -40°C to 125°C, f
sample
= 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 T
A
= 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.
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Product Folder Link(s): ADS7950, ADS7951, ADS7952, ADS7953 ADS7954, ADS7955, ADS7956, ADS7957 ADS7958,
ADS7959, ADS7960, ADS7961