Datasheet

LM12454, LM12458, LM12H458
SNAS079A –MAY 2004–REVISED FEBRUARY 2006 www.ti.com
CONVERTER CHARACTERISTICS
(1) (2) (3) (4)
(continued)
The following specifications apply to the LM12454, LM12458, and LM12H458 for V
A
+ = V
D
+ = 5V, V
REF+
= 5V, V
REF−
= 0V, 12-
bit + sign conversion mode, f
CLK
= 8.0 MHz (LM12H458) or f
CLK
= 5.0 MHz (LM12454/8), R
S
= 25Ω, source impedance for
V
REF+
and V
REF−
≤ 25Ω, fully-differential input with fixed 2.5V 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.
Symbol Parameter Conditions Typical
(5)
Limits
(6)
Units
Zero Error V
A
+ = V
D
+ = 5V ±10% ±0.2 ±1.75 LSB (max)
Power Supply Sensitivity V
REF+
= 4.5V, V
REF−
=
PSS Full-Scale Error ±0.4 ±2 LSB (max)
(11)
GND
Linearity Error ±0.2 LSB
C
REF
V
REF+
/V
REF−
Input Capacitance 85 pF
C
IN
Selected Multiplexer Channel Input Capacitance 75 pF
(11) Power Supply Sensitivity is measured after Auto-Zero and/or Auto-Calibration cycle has been completed with V
A
+ and V
D
+ at the
specified extremes.
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Product Folder Links: LM12454 LM12458 LM12H458