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ZN449E Schematic ( PDF Datasheet ) - ETC

Teilenummer ZN449E
Beschreibung 8-BIT MICROPROCESSOR COMPATIBLE A-D CONVERTER
Hersteller ETC
Logo ETC Logo 




Gesamt 18 Seiten
ZN449E Datasheet, Funktion
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






ZN449E Datasheet, Funktion
ZN448/9
VCC
20k
500
RD
(PIN 2)
GROUND
BITS 1-8
(PINS 11-18)
10k
Fig.5 Data output
Fig.6 Output enable/disable delays
6

6 Page









ZN449E pdf, datenblatt
ZN448/9
ANALOG INPUT RANGES
The basic connection of the ZN448/9 shown in Fig.15 has an
analogue input range 0 to VREF IN which, in some applications,
may be made available from previous signal conditioning/
scaling circuits. Input voltage ranges greater than this are
accommodated by providing an attenuator on the comparator
input, whilst for smaller input ranges the signal must be
amplified to a suitable level.
Bipolar input ranges are accommodated by off-setting the
analogue input input range so that the comparator always
sees a positive input voltage.
LSB
DB0 1
DIGITAL OUTPUTS
23 45
MSB VCC
6 DB7 (+5V)
18 17 16 15 14 13 12 11 10
RREF
(390)
1 234 567 89
VIN
REXT
(82k)
RIN
(4k)
BUSY RD CK WR V- AIN VREFIN VREFOUT GND
(-5V)
(0V)
NOMINAL AIN RANGE = 0 TO VREFIN
CREF
(4µ7)
Fig.15 External components for basic operation
12

12 Page





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