SNOSBI1B – NOVEMBER 2009 – REVISED FEBRUARY 2013
(1) (2)
OPERATING RATINGS
Temperature Range
ADC0804LCJ
ADC0801/02/03/05LCN
ADC0804LCN
ADC0802/04LCWM
Range of V
CC
(1)
(2)
over operating free-air temperature range (unless otherwise noted)
T
MIN
≤
T
A
≤
T
MAX
–40°C
≤
T
A
≤
+85°C
–40°C
≤
T
A
≤
+85°C
0°C
≤
T
A
≤
+70°C
0°C
≤
T
A
≤
+70°C
4.5 V
DC
to 6.3 V
DC
Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. DC and AC electrical specifications do not
apply when operating the device beyond its specified operating conditions.
All voltages are measured with respect to GND, unless otherwise specified. The separate A GND point should always be wired to the D
GND.
ELECTRICAL CHARACTERISTICS
The following specifications apply for V
CC
= 5 V
DC
, T
MIN
≤
T
A
≤
T
MAX
and f
CLK
= 640 kHz (unless otherwise specified).
PARAMETER
ADC0801: Total Adjusted Error
ADC0802: Total Unadjusted
Error
(1)
ADC0804: Total Unadjusted
Error
(1)
ADC0805: Total Unadjusted
Error
(1)
V
REF
/2 Input Resistance (Pin 9)
Analog Input Voltage Range
DC Common-Mode Error
Power Supply Sensitivity
(1)
(2)
(3)
(1)
CONDITIONS
With Full-Scale Adj. (See
V
REF
/2=2.500 V
DC
MIN
TYP
MAX
±1/4
±1/2
±1/2
±1
±1
UNITS
LSB
LSB
LSB
LSB
LSB
kΩ
ADC0803: Total Adjusted Error
(1)
With Full-Scale Adj.(See
V
REF
/2=2.500 VDC
V
REF
/2-No Connection
ADC0801/02/03/05
ADC0804
(2)
2.5
0.75
GND–0.0
5
8
1.1
V
CC
+0.05
±1/16
±1/16
±1/8
±1/8
V(+) or V(–)
(3)
Over Analog Input Voltage Range
V
CC
=5 V
DC
±10% Over Allowed V
IN
(+) and V
IN
(–) Voltage
Range
(3)
V
DC
LSB
LSB
None of these A/Ds requires a zero adjust (see
To obtain zero code at other analog input voltages see
and
The V
REF
/2 pin is the center point of a two-resistor divider connected from V
CC
to ground. In all versions of the ADC0801, ADC0802,
ADC0803, and ADC0805, and in the ADC0804LCJ, each resistor is typically 16 kΩ. In all versions of the ADC0804 except the
ADC0804LCJ, each resistor is typically 2.2 kΩ.
For V
IN
(−)≥ VIN(+) the digital output code will be 0000 0000. Two on-chip diodes are tied to each analog input (see block diagram)
which will forward conduct for analog input voltages one diode drop below ground or one diode drop greater than the V
CC
supply. Be
careful, during testing at low V
CC
levels (4.5V), as high level analog inputs (5V) can cause this input diode to conduct–especially at
elevated temperatures, and cause errors for analog inputs near full-scale. The spec allows 50 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 50 mV, the output code will be correct. To
achieve an absolute 0 V
DC
to 5 V
DC
input voltage range will therefore require a minimum supply voltage of 4.950 V
DC
over temperature
variations, initial tolerance and loading.
Copyright © 2009–2013, Texas Instruments Incorporated
3
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