7820 データシートの表示（PDF） - MAXWELL TECHNOLOGIES
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7820 Datasheet PDF : 18 Pages
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Microprocessor-compatible 8-Bit ADC
7820
TABLE 1. PIN DESCRIPTION
PIN
SYMBOL
DESCRIPTION
1
VIN
Analog Input Range: VREF(-) to VREF(+).
2
DB0 Data Output. Three State Output, bit 0 (LSB)
3
DB1 Data Output. Three State Output, bit 1
4
DB2 Data Output. Three State Output, bit 2
5
DB3 Data Output. Three State Output, bit 3
6
WR/RDY WRITE control input/READY status output.
7
Mode Mode Selection Input. It determines whether the device operates in the
WR-RD or RD mode. It is internally tied to GND through a 50 µ A current
source.
8
RD READ Input. RD must be low to access data from the part.
9
INT INTERUPT Output. INT going low indicates that the conversion is com-
plete INT returns high on rising the edge of RD or CS.
10
GND Ground
11
VREF- Lower limit of reference span. Range: GND < VREF(-) < VREF(+)
12
VREF+ Upper limit of reference span. Range: GND < VREF(-) < VREF(+) < VDD
13
CS Chip Select Input. CS, the decoded device address, must be low for RD
or WR to be recognized by the converter.
14
DB4 Data Output. Three State Output, bit 4
15
DB5 Data Output. Three State Output, bit 5
16
DB6 Data Output. Three State Output, bit 6
17
DB7 Data Output. Three State Output, bit 7 (MSB)
18
OFL Overflow Output. If the analog input is higher than (VREF(+) - 1/2LSB),
OFL will be low at the end of conversion. It is a non three state output
which can be used to cascade 2 or more devices to increase resolution.
19
NC No Connection.
20
VDD Power supply voltage, +5V
TABLE 2. 7820 ABSOLUTE MAXIMUM RATINGS1
PARAMETER
MIN
MAX
UNIT
VDD to GND
Digital Input Voltage to GND (Pins 6-80, 13)
Digital Output Voltage to GND (Pins 2-5, 9, 14-18)
VREF (+) to GND
VREF (-) to GND
-0
7.0
V
-0.3
VDD +0.3
V
0.3
VDD +0.3
V
0
VDD +0.3
V
VSS -0.3
VREF (+)
V
09.09.03 Rev 3
All data sheets are subject to change without notice 2
©2003 Maxwell Technologies
All rights reserved.
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