A-D CONVERTER. ZN427J8 Datasheet

ZN427J8 CONVERTER. Datasheet pdf. Equivalent

Part ZN427J8
Description MICROPROCESSOR COMPATIBLE 8-BIT SUCCESSIVE APPROXIMATION A-D CONVERTER
Feature ZN427E8 / ZN427J8 MICROPROCESSOR COMPATIBLE 8-BIT SUCCESSIVE APPROXIMATION A-D CONVERTER DS3006 - 2.
Manufacture GEC PLESSEY
Datasheet
Download ZN427J8 Datasheet



ZN427J8
ZN427E8 / ZN427J8
MICROPROCESSOR COMPATIBLE
8-BIT SUCCESSIVE APPROXIMATION A-D CONVERTER
DS3006 - 2.1
The ZN427 is an 8-bit successive approximation converter
with three-state outputs to permit easy interfacing to a
common data bus. The IC contains a voltage switching DAC,
a fast comparator, successive approximation logic and a
2.56V precision bandgap reference, the use of which is pin
optional to retain flexibility. An external fixed or varying
reference may therefore be substituted, thus allowing
ratiometic operation
Only passive external components are required for
operation of the converter.
FEATURES
s Easy Interfacing to Microprocessor, or Operates as a
'Stand-Alone' Converter
s Fast: 10 microseconds Conversion time Guaranteed
s No Missing Codes over Operating Temperature Range
s Data Outputs Three-State TTL Compatible, other
Logic Inputs and Output TTL and CMOS Compatible
s Choice of On-Chip or External Reference Voltage
s Ratiometric Operation
s Unipolar or Bipolar Input Ranges
s Complementary to ZN428 DAC
s Commercial or Military Temperature Range
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 BIT 8 (LSB)
17 BIT 7
16 BIT 6
15 BIT 5
14 BIT 4
13 BIT 3
12 BIT 2
11 BIT 1 (MSB)
10 +VCC (+5V)
ZN427J8 (DC18)
ZN427E8 (DP18)
Fig.1 Pin connection - top view
ORDERING INFORMATION
Device type Operating temperature
ZN427E8
ZN427J8
0°C to +70°C
-55°C to +125°C
Package
DP18
DC18
D TO A OUTPUT
COMPARATOR
-
VIN 6
REXT 5
CLOCK
INPUT
3
+
R-2R LADDER
ANALOGUE VOLTAGE SWITCHES
SUCCESSIVE
APPROXIMATION REGISTER
VCC
(+5V)
10
3-STATE BUFFERS
11
MSB
12
13 14
15 16 17 18
LSB
Fig.2 System diagram
+2.5V
REFERENCE
8
VREF OUT
9
GROUND
7
VREF IN
4
WR (START CONVERSION)
1
BUSY (END CONVERSION)
2
RD (OUTPUT ENABLE)



ZN427J8
ZN427
ABSOLUTE MAXIMUM RATINGS
Supply voltage VCC
Max. voltage, logic and VREF input
Operating temperature range
Storage temperature range
+7.0V
+VCC
0°C to +70°C (ZN427E8)
-55°C to +125°C (ZN427J8)
-55°C to +125°C
ELECTRICAL CHARACTERISTICS (at VCC = 5V, Tamb = 25°C unless otherwise specified).
Parameter
Min. Typ. Max.
Units
Conditions
Converter
Resolution
Linearity error
Differential non-linearity
Linearity error T.C.
Differential non-linearity T.C.
Full-scale (gain) T.C.
Zero T.C.
Zero transition
00000000
to 00000001
F.S. transition
11111110
to 11111111
Conversion time
External reference voltage
Supply voltage (VCC)
Supply current
Power consumption
8
-
-
-
-
-
-
12
10
2.545
-
-
±0.5
±3
±6
±2.5
±8
15
13
2.550
-
±0.5
-
-
-
-
-
18
16
2.555
- - 10
1.5 - 3.0
4.5 - 5.5
- 25 40
- 125 -
Bits
LSB
LSB
ppm/°C
ppm/°C
ppm/°C
µV/°C
mV
mV
V
µs
V
V
mA
mW
External Ref. 2.5V
DC Package
DP Package
VREF IN = 2.560V
See note 1
Comparator
Input current
Input resistance
Tail current, IEXT
Negative supply, V–
Input voltage
-1-
- 100 -
25 - 15
-3.0 - -30.0
-0.5 - 3.5
µA VIN = +3V, REXT = 82k
kV - = -5V
µA
V See comparator (page x-xx)
V
Internal voltagee reference
Output voltage
Slope resistance
VREF temperature coefficient
Reference current
2.475
-
-
4
2.560
0.5
50
-
2.625
2
-
15
V
ppm/°C
mA
RREF = 390, CREF = 4µ7
See reference (page x-xx)
Logic (over operating temperature range)
High level input voltage VIH
Low level input voltage VIL
High level input current,
WR and RD inputs IIH
High level input current,
Clock input IIH
Low level input current IIL
High level output current IOH
Low level output current IOL
High level output voltage VOH
Low level output voltage VOL
Disable output leakage
Input clamp diode voltage
Read input to data output
Enable/disable delay time tRD
Start pulse width tWR
WR to BUSY propagation delay tBD
Clock pulse width
Maximum clock frequency
2.0 -
-
- - 0.8
- - 50
- - 15
- - 100
- - 30
- - -5
- - -100
- - 1.6
2.4 -
-
- - 0.4
- -2
- - -1.5
- - 250
- 180 250
250 160
-
- - 250
500 -
-
900 1000
-
Note 1: A 900kHz clock gives a conversion time of 10µs (9 clock periods).
V
V
µA VIN = 5.5V, VCC = max.
µA VIN = 2.4V, VCC = max.
µA VIN = 5.5V, VCC = max.
µA VIN = 2.4V, VCC = max.
µA VIN = 0.4V, VCC = max.
µA
mA
V IOH = max., VCC = min.
V IOL = max., VCC = min.
µA VO = 2.4V
V
ns See Fig.9
ns
ns See Fig.9
ns
ns
kHz See note 1
2





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