Datasheet

LM12L458
SNAS085B –JULY 1999–REVISED MARCH 2013 www.ti.com
DC Characteristics
The following specifications apply for V
A
+ = V
D
+ = +3.3V, V
REF+
= +2.5V, V
REF−
= 0V, f
CLK
= 6.0 MHz and minimum acquisition
time unless otherwise specified. Boldface limits apply for T
A
= T
J
= T
MIN
to T
MAX
; all other limits T
A
= T
J
= 25°C.
(1) (2) (3)
Symbol Parameter Conditions Typical
(4)
Limits
(5)
Units
I
D
+ V
D
+ Supply Current CS = “1” 0.4 1.0 mA (max)
I
A
+ V
A
+ Supply Current CS = “1” 2.25 3.5 mA (max)
Stand-By Supply Current Clock Stopped 1.5 4.5 μA (max)
Power-Down
I
ST
(I
D
+ + I
A
+)
Mode Selected
6 MHz Clock 30 μA (max)
ON-Channel = 3.6V
0.1 0.3 μA (max)
OFF-Channel = 0V
Multiplexer ON-Channel Leakage
V
A
+ = +3.6V
Current
ON-Channel = 0V
0.1 0.3 μA (max)
OFF-Channel = 3.6V
ON-Channel = 3.6V
0.1 0.3 μA (max)
OFF-Channel = 0V
Multiplexer OFF-Channel
V
A
+ = +3.6V
Leakage Current
ON-Channel = 0V
0.1 0.3 μA (max)
OFF-Channel = 3.6V
V
IN
= +3.3V 850 1500 Ω
R
ON
Multiplexer ON-Resistance V
IN
= +1.65V 1300 2000 Ω
V
IN
= 0V 830 1500 Ω
V
IN
= +3.3V ±1.0% ±3.0% Ω
Multiplexer
Channel-to-Channel V
IN
= +1.65V ±1.0% ±3.0% Ω
R
ON
matching
V
IN
= 0V ±1.0% ±3.0% Ω
(1) Two on-chip diodes are tied to each analog input through a series resistor, as shown below. Input voltage magnitude up to 5V above
V
A
+ or 5V below GND will not damage the LM12L458. However, errors in the A/D conversion can occur if these diodes are forward
biased by more than 100 mV. As an example, if V
A
+ is 3.0 V
DC
, full-scale input voltage must be =3.1 V
DC
to ensure accurate
conversions. See Figure 3
(2) V
A
+ and V
D
+ must be connected together to the same power supply voltage and bypassed with separate capacitors at each V
+
pin to
assure conversion/comparison accuracy.
(3) Accuracy is ensured when operating at f
CLK
= 6 MHz.
(4) Typical figures are at T
A
= 25°C and represent most likely parametric norm.
(5) Limits are specified to AOQL (Average Output Quality Level).
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