SNAS535H – OCTOBER 1999 – REVISED MARCH 2013
Electrical Characteristics – Converter Specifications (continued)
Converter Specifications:
V
CC
=5 V
DC
=V
REF+
, V
REF(−)
=GND, T
MIN
≤T
A
≤T
MAX
and f
CLK
=640 kHz unless otherwise stated.
Symbol
ADC0809
Total Unadjusted Error
(1)
Input Resistance
Analog Input Voltage Range
V
REF(+)
Voltage, Top of Ladder
Voltage, Center of Ladder
V
REF(−)
I
IN
(2)
Voltage, Bottom of Ladder
Comparator Input Current
Measured at Ref(−)
f
c
=640 kHz,
(3)
Parameter
Conditions
0°C to 70°C
T
MIN
to T
MAX
From Ref(+) to Ref(−)
See
(2)
Min
Typ
Max
±1
±1¼
Units
LSB
LSB
kΩ
V
DC
V
V
V
1.0
GND
−
0.1
2.5
V
CC
+ 0.1
V
CC
V
CC
+ 0.1
(V
CC
/2) + 0.1
V(+) or V(−)
Measured at Ref(+)
(V
CC
/2)
−
0.1
−0.1
−2
V
CC
/2
0
±0.5
2
μA
(3)
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
n 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 absolute 0V
DC
to
5V
DC
input voltage range will therefore require a minimum supply voltage of 4.900 V
DC
over temperature variations, initial tolerance and
loading.
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
8).
See
Electrical Characteristics – Digital Levels and DC Specifications
Digital Levels and DC Specifications:
ADC0808CCN, ADC0808CCV, ADC0809CCN and ADC0809CCV, 4.75≤V
CC
≤5.25V,
−40°C≤T
A
≤+85°C
unless otherwise noted
Symbol
ANALOG MULTIPLEXER
V
CC
=5V, V
IN
=5V,
I
OFF(+)
OFF Channel Leakage Current
T
A
=25°C
T
MIN
to T
MAX
V
CC
=5V, V
IN
=0,
I
OFF(−)
OFF Channel Leakage Current
T
A
=25°C
T
MIN
to T
MAX
CONTROL INPUTS
V
IN(1)
V
IN(0)
I
IN(1)
I
IN(0)
I
CC
Logical “1” Input Voltage
Logical “0” Input Voltage
Logical “1” Input Current (The Control
Inputs)
Logical “0” Input Current (The Control
Inputs)
Supply Current
V
IN
=15V
V
IN
=0
f
CLK
=640 kHz
V
CC
= 4.75V
I
OUT
=
−360µA
I
OUT
=
−10µA
I
O
=1.6 mA
I
O
=1.2 mA
V
O
=5V
V
O
=0
−3
−1.0
0.3
3.0
(V
CC
−
1.5)
1.5
1.0
V
V
μA
μA
mA
−200
−1.0
−10
nA
μA
10
200
1.0
nA
μA
Parameter
Conditions
Min
Typ
Max
Units
DATA OUTPUTS AND EOC (INTERRUPT)
V
OUT(1)
V
OUT(0)
V
OUT(0)
I
OUT
Logical “1” Output Voltage
Logical “0” Output Voltage
Logical “0” Output Voltage EOC
TRI-STATE Output Current
2.4
4.5
0.45
0.45
3
V
V
V
V
μA
μA
Electrical Characteristics – Timing Specifications
Timing Specifications
V
CC
=V
REF(+)
=5V, V
REF(−)
=GND, t
r
=t
f
=20 ns and T
A
=25°C unless otherwise noted.
Symbol
t
STCLK
Parameter
Start Time Delay from Clock
7)
Conditions
MIn
300
Typ
Max
900
Units
ns
Copyright © 1999–2013, Texas Instruments Incorporated
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