Datasheet

ADC0816, ADC0817
SNAS527C –JUNE 1999–REVISED MARCH 2013 www.ti.com
Electrical Characteristics
Converter Specifications: V
CC
= 5 V
DC
= V
REF(+)
, V
REF(−)
= GND, V
IN
= V
COMPARATOR IN,
T
MIN
≤ T
MAX
and f
CLK
= 640 kHz unless
otherwise stated.
Symbol Parameter Conditions Min Typ Max Units
ADC0816
Total Unadjusted Error 25°C ±½ LSB
See Note
(1)
T
MIN
to T
MAX
±¾ LSB
ADC0817
Total Unadjusted Error 0°C to 70°C ±1 LSB
See Note
(1)
T
MIN
to T
MAX
±1¼ LSB
Input Resistance From Ref(+)to Ref(−) 1.0 4.5 kΩ
Analog Input Voltage Range V(+) or V(−)
(2)
GND − 0.1 V
CC
+ 0.1 V
DC
V
REF(+)
Voltage, Top of Ladder Measured at Ref(+) V
CC
V
CC
+0.1 V
V
Voltage, Center of Ladder V
CC
/2 − 0.1 V
CC
/2 V
CC
/2 + 0.1
V
REF(−)
Voltage, Bottom of Ladder Measured at Ref(−) −0.1 0 V
Comparator Input Current f
c
= 640 kHz,
(3)
−2 ±0.5 2 µA
(1) Total unadjusted error includes offset, full-scale, and linearity errors. See Figure 3. None of these A/Ds requires a zero or full-scale
adjust. However, if an all zero code is desired for an analog input other than 0.0V,or if a narrow full-scale span exists (for example: 0.5V
to 4.5V full-scale)the reference voltages can be adjusted to achieve this. See Figure 13.
(2) Two on-chip diodes are tied to each analog input which will forward conduct for analog input voltages one diode drop below ground or
one diode drop greater than the V
CC
supply. The spec allows 100 mV forward bias of either diode. This means that as long as the analog
V
IN
does not exceed the supply voltage by more than 100 mV, the output code will be correct. To achieve an absolute0 V
DC
to 5 V
DC
input voltage range will therefore require a minimum supply voltage of 4.900 V
DC
over temperature variations, initial tolerance and
loading.
(3) Comparator input current is a bias current into or out of the chopper stabilized comparator. The bias current varies directly with clock
frequency and has little temperature dependence (Figure 6).
4 Submit Documentation Feedback Copyright © 1999–2013, Texas Instruments Incorporated
Product Folder Links: ADC0816 ADC0817