Datasheet

LM12454, LM12458, LM12H458
SNAS079A –MAY 2004–REVISED FEBRUARY 2006 www.ti.com
CONVERTER AC 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
V
IN
= ±5V
f
IN
= 1 kHz −85.8 dB
DTHD Differential Total Harmonic Distortion
f
IN
= 20 kHz −79.9 dB
f
IN
= 40 kHz −72.9 dB
V
IN
= 5 V
p-p
f
IN
= 1 kHz −80.3 dB
Single-Ended Total Harmonic
SETHD
Distortion
f
IN
= 20 kHz −75.6 dB
f
IN
= 40 kHz −72.8 dB
V
IN
= ±5V
f
IN
= 1 kHz 12.6 Bits
DENOB Differential Effective Number of Bits
f
IN
= 20 kHz 12.2 Bits
f
IN
= 40 kHz 12.1 Bits
V
IN
= 5 V
p-p
f
IN
= 1 kHz 11.3 Bits
SEENOB Single-Ended Effective Number of Bits
f
IN
= 20 kHz 11.2 Bits
f
IN
= 40 kHz 10.8 Bits
V
IN
= ±5V
f
IN
= 1 kHz 87.2 dB
Differential Spurious Free Dynamic
DSFDR
Range
f
IN
= 20 kHz 78.9 dB
f
IN
= 40 kHz 72.8 dB
V
IN
= 5 V
P-P
, f
IN
= 40 kHz,
−76 dB
LM12454 MUXOUT Only
Multiplexer Channel-to-Channel
Crosstalk
V
IN
= 5 V
P-P
, f
IN
= 40 kHz,
−78 dB
LM12(H)458 MUX plus Converter
t
PU
Power-Up Time 10 ms
t
WU
Wake-Up Time 10 ms
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