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Numéro de référence | ZN448 | ||
Description | 8-BIT MICROPROCESSOR COMPATIBLE A-D CONVERTER | ||
Fabricant | ETC | ||
Logo | |||
ZN448/ZN449
8-BIT MICROPROCESSOR COMPATIBLE A-D CONVERTER
DS3013 - 2.2
The ZN448 and ZN449 are 8-bit successive
approximation A-D converters designed to be easily
interfaced to microprocessors. All active circuitry is contained
on-chip including a clock generator and stable 2.5V bandgap
reference, control logic and double buffered latches with
reference.
Only a reference resistor and capacitor, clock resistor and
capacitor and input resistors are required for operation with
either unipolar or bipolar input voltage.
FEATURES
s Easy Interfacing to Microprocessor, or operates as a
'Stand-Alone' Converter
s Fast: 9 microseconds Conversion time Guaranteed
s Choice of Linearity: 0.5 LSB - ZN448, 1 LSB - ZN449
s On-Chip Clock
s Choice of On-Chip or External Reference Voltage
s Unipolar or Bipolar Input Ranges
s Commercial Temperature Range
ORDERING INFORMATION
Device type
Linearity Operating
error (LSB) temperature
ZN448E
0.5 0°C to +70°C
ZN449D
1 0°C to +70°C
ZN449E
1 0°C to +70°C
Package
DP18
MP18
DP18
BUSY (END OF CONVERSION) 1
RD (OUTPUT ENABLE) 2
CLOCK 3
WR (START CONVERSION) 4
REXT 5
VIN
VREF IN
6
7
VREF OUT 8
GROUND 9
18 DB0 (LSB)
17 DB1
16 DB2
15 DB3
14 DB4
13 DB5
12 DB6
11 DB7 (MSB)
10 +VCC (+5V)
ZN448/9E (DP18)
BUSY (END OF CONVERSION)
RD (OUTPUT ENABLE)
CLOCK
WR (START CONVERSION)
REXT
VIN
VREF IN
VREF OUT
GROUND
1
2
3
4
5
6
7
8
9
ZN449D (MP18)
18
17
16
15
14
13
12
11
10
Fig.1 Pin connection - top view
DB0 (LSB)
DB1
DB2
DB3
DB4
DB5
DB6
DB7 (MSB)
+VCC (+5V)
ANALOGUE
INPUT
VREF IN
6
7
8
VREF OUT
2.5V
REFERENCE
8-BIT DAC
GROUND 9
VCC (+5V) 10
SUCCESSIVE
APPROXIMATION REGISTER
3-STATE BUFFERS
11 12 13 14 15 16 17 18
DB7
DB0
Fig.2 System diagram
COMPARATOR
+
-
5
REXT
CLOCK
GENERATOR
INTERFACE
AND
CONTROL
LOGIC
3 CK RC OR
EXT CLOCK
4
WR
1
BUSY
2
RD
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Pages | Pages 18 | ||
Télécharger | [ ZN448 ] |
No | Description détaillée | Fabricant |
ZN448 | 8-BIT MICROPROCESSOR COMPATIBLE A-D CONVERTER | ETC |
ZN448E | 8-BIT MICROPROCESSOR COMPATIBLE A-D CONVERTER | ETC |
ZN449 | 8-BIT MICROPROCESSOR COMPATIBLE A-D CONVERTER | ETC |
ZN449D | 8-BIT MICROPROCESSOR COMPATIBLE A-D CONVERTER | ETC |
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