Datasheet

ADS7950, ADS7951, ADS7952, ADS7953
ADS7954, ADS7955, ADS7956, ADS7957
ADS7958, ADS7959, ADS7960, ADS7961
www.ti.com SLAS605A –JUNE 2008–REVISED JANUARY 2010
ELECTRICAL CHARACTERISTICS, ADS7958/59/60/61 (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
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,
Full-scale input to channel being sampled with DC –85
input.
ETERNAL REFERENCE INPUT
Vref reference voltage at REFP 2.0 2.5 3.0 V
Reference resistance 100 kΩ
ALARM SETTING
Higher threshold range 000 FF Hex
Lower threshold range 000 FF 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
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 Numbers
reset
TEMPERATURE RANGE
Specified performance –40 125 °C
TIMING REQUIREMENTS (see Figure 45, Figure 46, Figure 47, and Figure 48)
All specifications typical at –40°C to 125°C, +VA = 2.7 V to 5.25 V (unless otherwise specified)
PARAMETER TEST CONDITIONS
(1) (2)
MIN TYP MAX UNIT
+VBD = 1.8 V 16
t
conv
Conversion time +VBD = 3 V 16 SCLK
+VBD = 5 V 16
+VBD = 1.8 V 40
Minimum quiet sampling time needed from bus
t
q
+VBD = 3 V 40 ns
3-state to start of next conversion
+VBD = 5 V 40
(1) 1.8V specifications apply from 1.7V to 1.9V, 3V specifications apply from 2.7V to 3.6V, 5V specifications apply from 4.75V to 5.25V.
(2) With 50-pF load
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ADS7959, ADS7960, ADS7961