Datasheet

ADC12048
www.ti.com SNAS105B –APRIL 2000–REVISED MARCH 2013
Reference Inputs
The following specifications apply to the ADC12048 for V
A
+ = V
D
+ = 5V, V
REF
+ = 4.096V, V
REF
− = 0.0V, 12-bit + sign
conversion mode, f
CLK
= 12.0 MHz, R
S
= 25Ω, source impedance for V
REF
+ and V
REF
− ≤ 1Ω, fully differential input with fixed
2.048V common-mode voltage, and minimum acquisition time, unless otherwise specified. Boldface limits apply for T
A
= T
J
= T
MIN
to T
MAX
; all other limits T
A
= T
J
= 25°C
Unit
Symbol Parameter Conditions Typical
(1)
Limits
(2)
(Limit)
I
REF
Reference Input Current V
REF
+ 4.096V, V
REF−
= 0V
Analog Input Signal: 1 kHz
(3)
145 μA
80 kHz 136 μA
C
REF
Reference Input Capacitance 85 pF
(1) Typicals are at T
A
= 25°C and represent most likely parametric norm.
(2) Limits are ensured to AOQL (Average Outgoing Quality Level).
(3) The reference input current is a DC average current drawn by the reference input with a full-scale sinewave input. The ADC12048 is
continuously converting with a throughput rate of 206 kHz.
Digital Logic Input/Output Characteristics
The following specifications apply to the ADC12048 for V
A
+ = V
D
+ = 5V, V
REF
+ = 4.096V, V
REF
− = 0.0V, 12-bit + sign
conversion mode, f
CLK
= 12.0 MHz, R
S
= 25Ω, source impedance for V
REF
+ and V
REF
− ≤ 1Ω, fully differential input with fixed
2.048V common-mode voltage, and minimum acquisition time, unless otherwise specified. Boldface limits apply for T
A
= T
J
= T
MIN
to T
MAX
; all other limits T
A
= T
J
= 25°C
Unit
Symbol Parameter Conditions Typical
(1)
Limits
(2)
(Limit)
V
IH
Logic High Input Voltage V
A
+ = V
D
+ = 5.5V 2.0 V (min)
V
IL
Logic Low Input Voltage V
A
+ = V
D
+ = 4.5V 0.8 V (max)
I
IH
Logic High Input Current V
IN
= 5V 0.035 2.0 μA (max)
I
IL
Logic Low Input Current V
IN
= 0V −0.035 −2.0 μA (max)
V
OH
Logic High Output Voltage V
A
+ = V
D
+ = 4.5V I
OUT
= −1.6 mA 2.4 V (min)
V
OL
Logic Low Output Voltage V
A
+ = V
D
+ = 4.5V I
OUT
= 1.6 mA 0.4 V (max)
I
OFF
TRI-STATE Output Leakage V
OUT
= 0V
±2.0 μA (max)
Current V
OUT
= 5V
C
IN
D12–D0 Input Capacitance 10 pF
(1) Typicals are at T
A
= 25°C and represent most likely parametric norm.
(2) Limits are ensured to AOQL (Average Outgoing Quality Level).
Converter AC Characteristics
The following specifications apply to the ADC12048 for V
S
+ = V
D
+ = 5V, V
REF
+ = 4.096V, V
REF
− = 0.0V, 12-bit + sign
conversion mode, f
CLK
= 12.0 MHz, R
S
= 25Ω, source impedance for V
REF
+ and V
REF
− ≤ 1Ω, fully differential input with fixed
2.048V common-mode voltage, and minimum acquisition time, unless otherwise specified. Boldface limits apply for T
A
= T
J
= T
MIN
to T
MAX
; all other limits T
A
= T
J
= 25°C
Unit
Symbol Parameter Conditions Typical
(1)
Limits
(2)
(Limit)
t
Z
Auto Zero Time 78 78 clks + 120 ns clks (max)
t
CAL
Full Calibration Time 4946 4946 clks + 120 ns clks (max)
50 %
CLK Duty Cycle 40 % (min)
60 % (max)
t
CONV
Conversion Time Sync-Out Mode 44 44 clks (max)
t
AcqSYNCOUT
Minimum for 13 Bits 9 9 clks + 120 ns clks (max)
Acquisition Time
(Programmable)
Maximum for 13 Bits 79 79 clks + 120 ns clks (max)
(1) Typicals are at T
A
= 25°C and represent most likely parametric norm.
(2) Limits are ensured to AOQL (Average Outgoing Quality Level).
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