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ADC0838CCWM Scheda tecnica(PDF) 4 Page - Texas Instruments

Il numero della parte ADC0838CCWM
Spiegazioni elettronici  ADC0831-N/ADC0832-N/ADC0834-N/ADC0838-N 8-Bit Serial I/O A/D Converters with Multiplexer Options
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Homepage  http://www.ti.com
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ADC0838CCWM Scheda tecnica(HTML) 4 Page - Texas Instruments

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ADC0831-N, ADC0832-N, ADC0834-N, ADC0838-N
SNAS531B – AUGUST 1999 – REVISED MARCH 2013
www.ti.com
Converter and Multiplexer Electrical Characteristics
The following specifications apply for VCC = V+ = VREF = 5V, VREF ≤ VCC +0.1V, TA = Tj = 25°C, and fCLK = 250 kHz unless
otherwise specified. Boldface limits apply from TMIN to TMAX.
BCV, CCV, CCWM, BCN
CIWM Devices
and CCN Devices
Parameter
Conditions
Units
Tested
Design
Tested
Design
Typ(1)
Typ(1)
Limit(2)
Limit(3)
Limit(2)
Limit(3)
CONVERTER AND MULTIPLEXER CHARACTERISTICS
ADC0838BCV
±½
±½
ADC0834BCN
±½
±½
Total
ADC0838CCV
±1
±1
Unadjusted
VREF = 5.00 V
(4)
LSB (Max)
ADC0831/2/4/8CCN
±1
±1
Error
ADC0831/2/4/8CCWM
±1
±1
ADC0832/8CIWM
±1
Minimum Reference Input
3.5
1.3
3.5
1.3
1.3
k
Ω
Resistance(5)
Maximum Reference Input
3.5
5.9
3.5
5.4
5.9
k
Ω
Resistance(5)
Maximum Common-Mode Input
VCC
VCC
VCC+0.05
V
Range(6)
+0.05
+0.05
Minimum Common-Mode Input
GND
GND
GND
V
Range(6)
−0.05
−0.05
−0.05
DC Common-Mode Error
±1/16
±¼
±1/16
±¼
±¼
LSB
15 mA into V+, VCC =
Change in zero error from VCC=5V
N.C.,
1
1
1
LSB
to internal zener operation(7)
VREF = 5V
VZ, internal diode
MIN 15 mA into V+
6.3
6.3
6.3
breakdown (at V+)(7)
MAX
8.5
8.5
8.5
V
Power Supply Sensitivity
VCC = 5V ± 5%
±1/16
±¼
±¼
±1/16
±¼
±¼
LSB
On Channel = 5V
−0.2
−0.2
−1
μA
Off Channel = 0V
−1
IOFF, Off Channel Leakage
Current(8)
On Channel = 0V
+0.2
+0.2
+1
μA
Off Channel = 5V
+1
On Channel = 0V
−0.2
−0.2
−1
μA
Off Channel = 5V
−1
ION, On Channel Leakage Current
(8)
On Channel = 5V
+0.2
+0.2
+1
μA
Off Channel = 0V
+1
(1)
Typicals are at 25°C and represent most likely parametric norm.
(2)
Tested limits are ensured to TI's AOQL (Average Outgoing Quality Level).
(3)
Ensured but not 100% production tested. These limits are not used to calculate outgoing quality levels.
(4)
Total unadjusted error includes offset, full-scale, linearity, and multiplexer errors.
(5)
Cannot be tested for ADC0832-N.
(6)
For VIN(−) ≥ VIN(+) the digital output code will be 0000 0000. Two on-chip diodes are tied to each analog input (see Functional Block
Diagram) which will forward conduct for analog input voltages one diode drop below ground or one diode drop greater than the VCC
supply. Be careful, during testing at low VCC levels (4.5V), as high level analog inputs (5V) can cause this input diode to
conduct—especially at elevated temperatures, and cause errors for analog inputs near full-scale. The spec allows 50 mV forward bias of
either diode. This means that as long as the analog VIN or VREF does not exceed the supply voltage by more than 50 mV, the output
code will be correct. To achieve an absolute 0 VDC to 5 VDC input voltage range will therefore require a minimum supply voltage of 4.950
VDC over temperature variations, initial tolerance and loading.
(7)
Internal zener diodes (6.3 to 8.5V) are connected from V+ to GND and VCC to GND. The zener at V+ can operate as a shunt regulator
and is connected to VCC via a conventional diode. Since the zener voltage equals the A/D's breakdown voltage, the diode insures that
VCC will be below breakdown when the device is powered from V+. Functionality is therefore ensured for V+ operation even though the
resultant voltage at VCC may exceed the specified Absolute Max of 6.5V. It is recommended that a resistor be used to limit the max
current into V+. (See Figure 24 in Functional Description)
(8)
Leakage current is measured with the clock not switching.
4
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Copyright © 1999–2013, Texas Instruments Incorporated
Product Folder Links: ADC0831-N ADC0832-N ADC0834-N ADC0838-N


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