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ADC0805 Arkusz danych(PDF) 3 Page - Texas Instruments

Numer części ADC0805
Szczegółowy opis  8-Bit 關P Compatible A/D Converters
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ADC0801, ADC0802
ADC0803, ADC0804, ADC0805
www.ti.com
SNOSBI1B – NOVEMBER 2009 – REVISED FEBRUARY 2013
OPERATING RATINGS
(1) (2)
over operating free-air temperature range (unless otherwise noted)
Temperature Range
TMIN ≤ TA ≤ TMAX
ADC0804LCJ
–40°C
≤ TA ≤ +85°C
ADC0801/02/03/05LCN
–40°C
≤ TA ≤ +85°C
ADC0804LCN
0°C
≤ TA ≤ +70°C
ADC0802/04LCWM
0°C
≤ TA ≤ +70°C
Range of VCC
4.5 VDC to 6.3 VDC
(1)
Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. DC and AC electrical specifications do not
apply when operating the device beyond its specified operating conditions.
(2)
All voltages are measured with respect to GND, unless otherwise specified. The separate A GND point should always be wired to the D
GND.
ELECTRICAL CHARACTERISTICS
The following specifications apply for VCC = 5 VDC, TMIN ≤ TA ≤ TMAX and fCLK = 640 kHz (unless otherwise specified).
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
ADC0801: Total Adjusted Error(1) With Full-Scale Adj. (See Full-Scale)
±1/4
LSB
ADC0802: Total Unadjusted
VREF/2=2.500 VDC
±1/2
LSB
Error(1)
ADC0803: Total Adjusted Error(1) With Full-Scale Adj.(See Full-Scale)
±1/2
LSB
ADC0804: Total Unadjusted
VREF/2=2.500 VDC
±1
LSB
Error (1)
ADC0805: Total Unadjusted
VREF/2-No Connection
±1
LSB
Error (1)
ADC0801/02/03/05
2.5
8
VREF/2 Input Resistance (Pin 9)
k
ADC0804 (2)
0.75
1.1
GND–0.0
Analog Input Voltage Range
V(+) or V(–)(3)
VCC+0.05
VDC
5
DC Common-Mode Error
Over Analog Input Voltage Range
±1/16
±1/8
LSB
VCC=5 VDC ±10% Over Allowed VIN(+) and VIN(–) Voltage
Power Supply Sensitivity
±1/16
±1/8
LSB
Range(3)
(1)
None of these A/Ds requires a zero adjust (see Zero Error). To obtain zero code at other analog input voltages see Errors and
Reference Voltage Adjustments and Figure 51.
(2)
The VREF/2 pin is the center point of a two-resistor divider connected from VCC to ground. In all versions of the ADC0801, ADC0802,
ADC0803, and ADC0805, and in the ADC0804LCJ, each resistor is typically 16 k
Ω. In all versions of the ADC0804 except the
ADC0804LCJ, each resistor is typically 2.2 k
Ω.
(3)
For VIN(−)≥ VIN(+) the digital output code will be 0000 0000. Two on-chip diodes are tied to each analog input (see 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 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.
Copyright © 2009–2013, Texas Instruments Incorporated
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Product Folder Links: ADC0801, ADC0802 ADC0803, ADC0804, ADC0805


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