Datasheet

ADS7950, ADS7951, ADS7952, ADS7953
ADS7954, ADS7955, ADS7956, ADS7957
ADS7958, ADS7959, ADS7960, ADS7961
www.ti.com SLAS605A –JUNE 2008–REVISED JANUARY 2010
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
Integral linearity –0.5 ±0.2 0.5 LSB
(2)
Differential linearity –0.5 ±0.2 0.5 LSB
Offset error
(3)
–1.5 ±0.5 1.5 LSB
Range 1 –1 ±0.1 1
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 –80 dB
Signal-to-noise ratio 100 kHz 60 dB
Signal-to-noise + distortion 100 kHz 60
Spurious free dynamic range 100 kHz 82 dB
Full power bandwidth At –3 dB 47 MHz
Any off-channel with 100kHz, Full-scale input to –95
channel being sampled with DC input.
Channel-to-channel crosstalk dB
From previously sampled to channel with 100kHz, –85
Full-scale input to channel being sampled with DC
input.
EXTERNAL REFERENCE INPUT
V
ref
reference voltage at REFP 2.0 2.5 3.0 V
Reference resistance 100 kΩ
ALARM SETTING
Higher threshold range 000 FFC Hex
Lower threshold range 000 FFC Hex
DIGITAL INPUT/OUTPUT
Logic family CMOS
V
IH
0.7*(+VBD)
V
IL
+VBD = 5 V 0.8
Logic level V
IL
+VBD = 3 V 0.4 V
V
OH
At I
source
= 200 mA Vdd-0.2
V
OL
At I
sink
= 200 mA 0.4
Data format MSB first MSB First
POWER SUPPLY REQUIREMENTS
+VA supply voltage 2.7 3.3 5.25 V
+VBD supply voltage 1.7 3.3 5.25 V
At +VA = 2.7 to 3.6 V and 1MHz throughput 1.8 mA
At +VA = 2.7 to 3.6 V static state 1.05 1 mA
Supply current (normal mode)
At +VA = 4.7 to 5.25 V and 1 MHz throughput 2.3 3 mA
At +VA = 4.7 to 5.25 V static state 1.1 1.5 mA
(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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Product Folder Link(s): ADS7950, ADS7951, ADS7952, ADS7953 ADS7954, ADS7955, ADS7956, ADS7957 ADS7958,
ADS7959, ADS7960, ADS7961