參數(shù)資料
型號(hào)： ADC12041CIV
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： ADC
英文描述： 12-Bit Plus Sign 216 kHz Sampling Analog-to-Digital Converter
中文描述： 1-CH 13-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQCC28
封裝： PLASTIC, LCC-28
文件頁數(shù)： 7/28頁
文件大?。?/td> 591K
代理商： ADC12041CIV
Digital Timing Characteristics
(Continued)
The following specifications apply to the ADC12041, 13-bit data bus width, V
A
+ = V
D
+ = 5V, f
CLK
= 12 MHz, t
f
= 3 ns and C
L
= 50 pF on data I/O lines
Symbol
Parameter
Conditions
Typical
(Note 10)
Limits
(Note 11)
Unit
(Limit)
t
RDRDY
Rising Edge of RD
to Rising Edge of RDY
Active Edge of WR
to Rising Edge of RDY
Active Edge of WR
to Falling Edge of RDY
24
38
ns (max)
t
WRRDY
WMODE = “1”
37
60
ns (max)
t
STDRDY
WMODE = “0”. Writing the
RESET Command into the
Configuration Register
1.4
2.5
ms (max)
t
SYNC
Minimum SYNC Pulse Width
5
10
ns (min)
Notes on Specifications
Note 1:
Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed
specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test condi-
tions.
Note 2:
All voltages are measured with respect to GND, unless otherwise specified.
Note 3:
When the input voltage (V
) at any pin exceeds the power supply rails (V
<
GND or V
>
(V
+ or V
+)), the current at that pin should be limited to 30
mA. The 120 mA maximum package input current limits the number of pins that can safely exceed the power supplies with an input current of 30 mA to four.
Note 4:
The maximum power dissipation must he derated at elevated temperatures and is dictated by T
, (maximum junction temperature),
θ
JA
(package junc-
tion to ambient thermal resistance), and T
(ambient temperature). The maximum allowable power dissipation at any temperature is P
= (T
T
)/
θ
or
the number given in the Absolute Maximum Ratings, whichever is lower. For this device, T
= 150C, and the typical thermal resistance (
θ
JA
) of the ADC12041
in the V package, when board mounted, is 55C/W, and in the SSOP package, when board mounted, is 130C/W.
Note 5:
Human body model, 100 pF discharged through 1.5
k resistor.
Note 6:
Each input is protected by a nominal 6.5V breakdown voltage zener diode to GND, as shown below, input voltage magnitude up to 5V above V
+ or 5V
below GND will not damage the ADC12041. There are parasitic diodes that exist between the inputs and the power supply rails and errors in the A/D conversion
can occur if these diodes are forward biased by more than 50 mV. As an example, if V
A
+ is 4.50 V
DC
, full-scale input voltage must be 4.55 V
DC
to ensure accurate
conversions.
Note 7:
V
+ and V
+ must be connected together to the same power supply voltage and bypassed with separate capacitors at each V
+
pin to assure conversion/
comparison accuracy. Refer to the Power Supply Considerations section for a detailed discussion.
Note 8:
Accuracy is guaranteed when operating at f
CLK
= 12 MHz.
Note 9:
With the test condition for V
REF
(V
REF
+ V
REF
) given as + 4.096V, the 12-bit LSB is 1.000 mV.
Note 10:
Typicals are at T
A
= 25C and represent most likely parametric norm.
Note 11:
Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).
Note 12:
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.
Note 13:
Zero error is a measure of the deviation from the mid-scale voltage (a code of zero), expressed in LSB. It is the average value of the code transitions be-
tween 1 to 0 and 0 to + 1 (see Figure 8).
Note 14:
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 out-
put value when the inputs are driven with a 2.5V input.
Note 15:
Power Supply Sensitivity is measured after an Auto-Zero and Auto Calibration cycle has been completed with V
A
+ and V
D
+ at the specified extremes.
Note 16:
V
REFCM
(Reference Voltage Common Mode Range) is defined as
DS012441-4
A
www.national.com
7
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