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ADC12L080 Arkusz danych(PDF) 6 Page - Texas Instruments

Numer części ADC12L080
Szczegółowy opis  12-Bit, 80 MSPS, 450 MHz Bandwidth A/D Converter with Internal Reference
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Producent  TI1 [Texas Instruments]
Strona internetowa  http://www.ti.com
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ADC12L080 Arkusz danych(HTML) 6 Page - Texas Instruments

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ADC12L080
SNAS200A – OCTOBER 2004 – REVISED OCTOBER 2004
www.ti.com
Converter Electrical Characteristics
Unless otherwise specified, the following specifications apply for AGND = DGND = DR GND = 0V, VA = VD = +3.3V, VDR =
+2.5V, PD = 0V, VREF = +1.0V external, VCM = 1.65V, RS < 100Ω, fCLK = 80 MHz, tr = tf = 2 ns, fIN = 70 MHz, CL = 15 pF/pin.
Boldface limits apply for TJ = TMIN to TMAX: all other limits TJ = 25°C
(1) (2) (3) (4)
Typical
Limits
Units
Symbol
Parameter
Conditions
(4)
(4)
(Limits)
STATIC CONVERTER CHARACTERISTICS
Resolution with No Missing Codes
12
Bits
4.0
LSB (max)
INL
Integral Non Linearity
Best Fit Method
±1.2
-3.3
LSB (min)
1.5
LSB (max)
DNL
Differential Non Linearity
No missing codes
±0.4
-1.0
LSB (min)
+5.7
%FS (max)
Positive Error
−0.15
-2
%FS (min)
GE
Gain Error
+5
%FS (max)
Negative Error
+0.4
-3.7
%FS (min)
Offset Error (VIN+ = VIN−)
+1.7
+0.2
%FS (max)
-0.6
Under Range Output Code
0
0
Over Range Output Code
4095
4095
REFERENCE AND ANALOG INPUT CHARACTERISTICS
0.5
V (min)
VCM
Common Mode Input Voltage
1.65
2.0
V (max)
(CLK LOW)
8
pF
VIN Input Capacitance
CIN
VIN = 1.0 Vdc + 1 VP-P
(each pin to GND)
(CLK HIGH)
7
pF
0.8
V (min)
VREF
Reference Voltage (5)
1.0
1.5
V (max)
(1)
The inputs are protected as shown below. Input voltages above VA or below GND will not damage this device, provided current is limited
per (). However, errors in the A/D conversion can occur if the input goes above VA or below GND by more than 100 mV. As an example,
if VA is 3.3V, the full-scale input voltage must be ≤3.4V to ensure accurate conversions.
(2)
To guarantee accuracy, it is required that |VA–VD| ≤ 100 mV and separate bypass capacitors are used at each power supply pin.
(3)
With the test condition for VREF = +1.0V (2 VP-P differential input), the 12-bit LSB is 488 µV.
(4)
Typical figures are at TA = TJ = 25°C, and represent most likely parametric norms. Test limits are guaranteed to National's AOQL
(Average Outgoing Quality Level).
(5)
Optimum dynamic performance will be obtained by keeping the reference input in the 0.8V to 1.5V range. The LM4051CIM3-ADJ or the
LM4051CIM3-1.2 band gap voltage reference is recommended for this application.
6
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