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LM12454 Datasheet(PDF) 6 Page - Texas Instruments

Part # LM12454
Description  LM12454/LM12458/LM12H458 12-Bit Sign Data Acquisition System with Self-Calibration
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM12454 Datasheet(HTML) 6 Page - Texas Instruments

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LM12454, LM12458, LM12H458
SNAS079A – MAY 2004 – REVISED FEBRUARY 2006
www.ti.com
Converter Characteristics
(1) (2) (3) (4)
The following specifications apply to the LM12454, LM12458, and LM12H458 for VA+ = VD+ = 5V, VREF+ = 5V, VREF− = 0V, 12-
bit + sign conversion mode, fCLK = 8.0 MHz (LM12H458) or fCLK = 5.0 MHz (LM12454/8), RS = 25Ω, source impedance for
VREF+ and VREF− ≤ 25Ω, fully-differential input with fixed 2.5V common-mode voltage, and minimum acquisition time unless
otherwise specified. Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = 25°C.
Symbol
Parameter
Conditions
Typical (5)
Limits (6)
Units
ILE
Integral Linearity Error (7) (8)
After Auto-Cal
±1/2
±1
LSB (max)
TUE
Total Unadjusted Error(7)
After Auto-Cal
±1
LSB
Resolution with No Missing Codes (7)
After Auto-Cal
13
Bits (max)
DNL
Differential Non-Linearity
After Auto-Cal
±¾
LSB (max)
After Auto-Cal
±1
Zero Error (9) (8)
LM12H458
±1/2
±1.5
LSB (max)
Positive Full-Scale Error (7) (8)
After Auto-Cal
±1/2
±2
LSB (max)
Negative Full-Scale Error (7) (8)
After Auto-Cal
±1/2
±2
LSB (max)
DC Common Mode Error (10)
±2
±3.5
LSB (max)
8-Bit + Sign and “Watchdog” Mode
ILE
±1/2
LSB (max)
Integral Linearity Error (7)
8-Bit + Sign and “Watchdog” Mode Total
TUE
After Auto-Zero
±1/2
±3/4
LSB (max)
Unadjusted Error
8-Bit + Sign and “Watchdog” Mode
Resolution
9
Bits (max)
with No Missing Codes
8-Bit + Sign and “Watchdog” Mode
DNL
±3/4
LSB (max)
Differential Non-Linearity
8-Bit + Sign and “Watchdog” Mode Zero
After Auto-Zero
±1/2
LSB (max)
Error
8-Bit + Sign and “Watchdog” Full-Scale
±1/2
LSB (max)
Error
8-Bit + Sign and “Watchdog” Mode
±1/8
LSB
DC Common Mode Error
Multiplexer Channel-to-Channel Matching
±0.05
LSB
GND
V (min)
VIN+
Non-Inverting Input Range
VA+
V (max)
GND
V (min)
VIN−
Inverting Input Range
VA+
V (max)
−VA
+
V (min)
VIN+ − VIN−
Differential Input Voltage Range
VA+
V (max)
V (min)
GND
V (max)
Common Mode Input Voltage Range
VA+
(1)
Two on-chip diodes are tied to each analog input through a series resistor, as shown below. Input voltage magnitude up to 5V above
VA+ or 5V below GND will not damage the LM12454 or the LM12(H)458. However, errors in the A/D conversion can occur if these
diodes are forward biased by more than 100 mV. As an example, if VA+ is 4.5 VDC, full-scale input voltage must be ≤4.6 VDC to ensure
accurate conversions.
(2)
VA+ and VD+ must be connected together to the same power supply voltage and bypassed with separate capacitors at each V
+ pin to
assure conversion/comparison accuracy.
(3)
Accuracy is guaranteed when operating at fCLK = 5 MHz for the LM12454/8 and fCLK = 8 MHz for the LM12H458.
(4)
With the test condition for VREF (VREF+ − VREF−) given as +5V, the 12-bit LSB is 1.22 mV and the 8-bit/“Watchdog” LSB is 19.53 mV.
(5)
Typical figures are at TA = 25°C and represent most likely parametric norm.
(6)
Limits are to AOQL (Average Output Quality Level).
(7)
Positive integral linearity error is defined as the deviation of the analog value, expressed in LSBs, from the straight line that passes
through positive full-scale and zero. For negative integral linearity error the straight line passes through negative full-scale and zero.
(See Figure 6 Figure 7).
(8)
The LM12(H)454/8's self-calibration technique ensures linearity and offset errors as specified, but noise inherent in the self-calibration
process will result in a repeatability uncertainty of ±0.10 LSB.
(9)
Zero error is a measure of the deviation from the mid-scale voltage (a code of zero), expressed in LSB. It is the worst-case value of the
code transitions between
−1 to 0 and 0 to +1 (see Figure 8).
(10) The DC common-mode error is measured with both inputs shorted together and driven from 0V to 5V. The measured value is referred to
the resulting output value when the inputs are driven with a 2.5V signal.
6
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Copyright © 2004–2006, Texas Instruments Incorporated
Product Folder Links: LM12454 LM12458 LM12H458


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