Datasheet

EXTERNAL REFERENCE SPECIFICATIONS
(1)
INTERNAL REFERENCE SPECIFICATIONS
(1)
TLV2556-EP
SLAS598A – NOVEMBER 2008 – REVISED JULY 2009 ................................................................................................................................................... www.ti.com
PARAMETER TEST CONDITIONS MIN TYP
(2)
MAX UNIT
V
CC
= 4.5 V to 5.5 V – 0.1 0 0.1
Reference input voltage, REF – V
V
CC
= 2.7 V to 3.6 V – 0.1 0 0.1
V
CC
= 4.5 V to 5.5 V 2 V
CC
Reference input voltage, REF+ V
V
CC
= 2.7 V to 3.6 V 2 V
CC
V
CC
= 4.5 V to 5.5 V 1.9 V
CC
External reference input voltage
V
difference, (REF+) – (REF – )
V
CC
= 2.7 V to 3.6 V 1.9 V
CC
V
CC
= 4.5 V to 5.5 V 1
External reference supply current CS = 0 V mA
V
CC
= 2.7 V to 3.6 V 0.7
Static 1 M Ω
V
CC
= 5 V
During sampling/conversion 9 k Ω
Reference input impedance
Static 1 M Ω
V
CC
= 2.7 V
During sampling/conversion 9 k Ω
(1) Add a 0.1- µ F capacitor between REF+ and REF – pins when external reference is used.
(2) All typical values are at V
CC
= 5 V, T
A
= 25 ° C.
PARAMETER TEST CONDITIONS MIN TYP
(2)
MAX UNIT
Reference input voltage, REF – V
CC
= 2.7 V to 5.5 V, REF – = Analog GND 0 V
V
CC
= 5.5 V, Internal 4.096-V V
REF
selected 3.95 4.065 4.25
Internal reference voltage delta, (REF+) – (REF – ) V
CC
= 5.5 V, Internal 2.048-V V
REF
selected 1.94 2.019 2.15 V
V
CC
= 2.7 V, Internal 2.048-V V
REF
selected 1.94 2.019 2.15
V
CC
= 5 V 20
Internal reference start up time With 10- µ F load ms
V
CC
= 2.7 V 20
Internal reference temperature coefficient V
CC
= 2.7 V to 5.5 V ± 50 ppm/ ° C
(1) When an internal reference is used, the following conditions are required:
a. Add 0.1- µ F and 10- µ F capacitors between REF+ and REF – pins.
b. REF – must be connected to analog GND (the ground pin of the ADC).
(2) All typical values are at V
CC
= 5 V, T
A
= 25 ° C.
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