ADC0804LCN National Semiconductor, ADC0804LCN Datasheet - Page 34
ADC0804LCN
Manufacturer Part Number
ADC0804LCN
Description
IC, ADC, 8BIT, 9708SPS, DIP-20
Manufacturer
National Semiconductor
Datasheet
1.ADC0804LCN.pdf
(41 pages)
Specifications of ADC0804LCN
Resolution (bits)
8bit
Sampling Rate
9.708kSPS
Input Channel Type
Differential
Data Interface
CMOS, Parallel, TTL
Supply Current
1.9mA
Digital Ic Case Style
DIP
No. Of Pins
20
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
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Functional Description
any output of Port B will source current into node V
raising the voltage at V
more negative. Conversely, a logic “0” (0V) will pull current
out of node V
ential output to become more positive. For the resistor val-
ues shown, V
which will null the offset error term to
Note 26: R2 = 49.5 R1
Note 27: Switches are LMC13334 CMOS analog switches.
Note 28: The 9 resistors used in the auto-zero section can be
X
X
and decrease the voltage, causing the differ-
can move
X
±
and making the output differential
12 mV with a resolution of 50 µV,
FIGURE 18. Gain of 100 Differential Transducer Preamp
1
⁄
4
(Continued)
LSB of full-scale for
±
5% tolerance.
X
thus
34
the ADC0801. It is important that the voltage levels that drive
the auto-zero resistors be constant. Also, for symmetry, a
logic swing of 0V to 5V is convenient. To achieve this, a
CMOS buffer is used for the logic output signals of Port B
and this CMOS package is powered with a stable 5V source.
Buffer amplifier A1 is necessary so that it can source or sink
the D/A output current.
DS005671-91