Manual

Reference Inputs The following specifications apply to the ADC12048 for V
A
a
e
V
D
a
e
5V, V
REF
a
e
4.096V,
V
REF
b
e
0.0V, 12-bit
a
sign conversion mode, f
CLK
e
12.0 MHz, R
S
e
25X, source impedance for V
REF
a
and V
REF
b
s
1X, fully differential input with fixed 2.048V common-mode voltage, and minimum acquisition time, unless otherwise specified.
Boldface limits apply for T
A
e
T
J
e
T
MIN
to T
MAX
; all other limits T
A
e
T
J
e
25
§
C
Symbol Parameter Conditions
Typical Limits Unit
(Note 10) (Note 11) (Limit)
I
REF
Reference Input Current V
REF
a
4.096V, V
REF
b
e
0V
Analog Input Signal: 1 kHz 145 mA
(Note 20) 80 kHz 136 mA
C
REF
Reference Input Capacitance 85 pF
Digital Logic Input/Output Characteristics The following specifications apply to the ADC12048 for
V
A
a
e
V
D
a
e
5V, V
REF
a
e
4.096V, V
REF
b
e
0.0V, 12-bit
a
sign conversion mode, f
CLK
e
12.0 MHz, R
S
e
25X, source
impedance for V
REF
a
and V
REF
b
s
1X, fully differential input with fixed 2.048V common-mode voltage, and minimum acquisi-
tion time, unless otherwise specified. Boldface limits apply for T
A
e
T
J
e
T
MIN
to T
MAX
; all other limits T
A
e
T
J
e
25
§
C
Symbol Parameter Conditions
Typical Limits Unit
(Note 10) (Note 11) (Limit)
V
IH
Logic High Input Voltage V
A
a
e
V
D
a
e
5.5V 2.0 V (min)
V
IL
Logic Low Input Voltage V
A
a
e
V
D
a
e
4.5V 0.8 V (max)
I
IH
Logic High Input Current V
IN
e
5V 0.035 2.0 mA (max)
I
IL
Logic Low Input Current V
IN
e
0V
b
0.035
b
2.0 mA (max)
V
OH
Logic High Output Voltage V
A
a
e
V
D
a
e
4.5V
I
OUT
eb
1.6 mA 2.4 V (min)
V
OL
Logic Low Output Voltage V
A
a
e
V
D
a
e
4.5V
I
OUT
e
1.6 mA 0.4 V (max)
I
OFF
TRI-STATE
É
Output V
OUT
e
0V
g
2.0 mA (max)
Leakage Current
V
OUT
e
5V
C
IN
D12– D0 Input Capacitance 10 pF
Converter AC Characteristics The following specifications apply to the ADC12048 for V
S
a
e
V
D
a
e
5V,
V
REF
a
e
4.096V, V
REF
b
e
0.0V, 12-bit
a
sign conversion mode, f
CLK
e
12.0 MHz, R
S
e
25X, source impedance for V
REF
a
and V
REF
b
s
1X, fully differential input with fixed 2.048V common-mode voltage, and minimum acquisition time, unless
otherwise specified. Boldface limits apply for T
A
e
T
J
e
T
MIN
to T
MAX
; all other limits T
A
e
T
J
e
25
§
C
Symbol Parameter Conditions
Typical Limits Unit
(Note 10) (Note 11) (Limit)
t
Z
Auto Zero Time 78 78 clks
a
120 ns clks (max)
t
CAL
Full Calibration Time 4946 4946 clks
a
120 ns clks (max)
CLK Duty Cycle 50 %
40 % (min)
60 % (max)
t
CONV
Conversion Time Sync-Out Mode 44 44 clks (max)
t
AcqSYNCOUT
Acquisition Time Minimum for 13 Bits 9 9 clks
a
120 ns clks (max)
(Programmable)
Maximum for 13 Bits 79 79 clks
a
120 ns clks (max)
5