Datasheet
ADS7950, ADS7951, ADS7952, ADS7953
ADS7954, ADS7955, ADS7956, ADS7957
ADS7958, ADS7959, ADS7960, ADS7961
SLAS605A –JUNE 2008–REVISED JANUARY 2010
www.ti.com
ELECTRICAL CHARACTERISTICS, ADS7954/55/56/57 (continued)
+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
Power-down state supply current 1 mA
+VBD supply current +VA = 5.25V, f
s
= 1MHz 1 mA
Power-up time 1 mSec
Invalid conversions after power up or 1 Numbers
reset
TEMPERATURE RANGE
Specified performance –40 125 °C
ELECTRICAL CHARACTERISTICS, ADS7958/59/60/61
+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
VREF
Range 1 –0.20
+0.20
Absolute input range V
2*VREF
Range 2 while 2Vref ≤ +VA –0.20
+0.20
Input capacitance 15 rF
Input leakage current T
A
= 125°C 61 nA
SYSTEM PERFORMANCE
Resolution 8 Bits
No missing codes 8 Bits
Integral linearity –0.3 ±0.1 0.3 LSB
(2)
Differential linearity –0.3 ±0.1 0.3 LSB
Offset error
(3)
–0.5 ±0.2 0.5 LSB
Range 1 –0.6 ±0.1 0.6
Gain error LSB
Range 2 ±0.1
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
(4)
100 kHz –75 dB
Signal-to-noise ratio 100 kHz 49 dB
Signal-to-noise + distortion 100 kHz 49
Spurious free dynamic range 100 kHz –78 dB
Full power bandwidth At –3 dB 47 MHz
(1) Ideal input span; does not include gain or offset error.
(2) LSB means Least Significant Bit.
(3) Measured relative to an ideal full-scale input
(4) Calculated on the first nine harmonics of the input frequency.
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ADS7959, ADS7960, ADS7961