Datasheet

ADS7950, ADS7951, ADS7952, ADS7953
ADS7954, ADS7955, ADS7956, ADS7957
ADS7958, ADS7959, ADS7960, ADS7961
SLAS605A –JUNE 2008–REVISED JANUARY 2010 www.ti.com
ELECTRICAL CHARACTERISTICS, ADS7950/51/52/53 (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
V
ref
reference voltage at REFP
(6)
2.0 2.5 3.0 V
Reference resistance 100 kΩ
ALARM SETTING
Higher threshold range 0 FFC Hex
Lower threshold range 0 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 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
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 Number
reset s
TEMPERATURE RANGE
Specified performance –40 125 °C
(6) Device is designed to operate over V
ref
= 2.0 V to 3.0 V. However one can expect lower noise performance at V
ref
< 2.4 V. This is due to
SNR degradation resulting from lowered signal range.
ELECTRICAL CHARACTERISTICS, ADS7954/55/56/57
+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 10 Bits
No missing codes 10 Bits
(1) Ideal input span; does not include gain or offset error.
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Product Folder Link(s): ADS7950, ADS7951, ADS7952, ADS7953 ADS7954, ADS7955, ADS7956, ADS7957 ADS7958,
ADS7959, ADS7960, ADS7961