ADC1242 PDF даташит
Спецификация ADC1242 изготовлена «National Semiconductor» и имеет функцию, называемую «12-Bit Plus Sign Sampling A/D Converter». |
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Детали детали
Номер произв | ADC1242 |
Описание | 12-Bit Plus Sign Sampling A/D Converter |
Производители | National Semiconductor |
логотип |
14 Pages
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February 1995
ADC1242
12-Bit Plus Sign Sampling A D Converter
General Description
The ADC1242 is a CMOS 12-bit plus sign successive ap-
proximation analog-to-digital converter On request the
ADC1242 goes through a self-calibration cycle that adjusts
positive linearity error to less than g1 LSB full-scale error to
less than g3 LSB and zero error to less than g2 LSB The
ADC1242 also has the ability to go through an Auto-Zero
cycle that corrects the zero error during every conversion
The analog input to the ADC1242 is tracked and held by the
internal circuitry and therefore does not require an external
sample-and-hold A unipolar analog input voltage range (0V
to a5V) or a bipolar range (b5V to a5V) can be accom-
modated with g5V supplies
The 13-bit word on the outputs of the ADC1242 gives a 2’s
complement representation of negative numbers The digi-
tal inputs and outputs are compatible with TTL or CMOS
logic levels
Applications
Y Digital Signal Processing
Y High Resolution Process Control
Y Instrumentation
Key Specifications
Y Resolution
12 Bits plus Sign
Y Conversion Time
13 8 ms (max)
Y Linearity Error
g1 LSB (g 0 0244%) (max)
Y Zero Error
g2 LSB (max)
Y Positive Full Scale Error
g3 LSB (max)
Y Power Consumption
70 mW (max)
Features
Y Self-calibrating
Y Internal sample-and-hold
Y Bipolar input range with g5V supplies and single
a5V reference
Y No missing codes over temperature
Y TTL MOS input output compatible
Y Standard 28-pin ceramic DIP
TRI-STATE is a registered trademark of National Semiconductor Corporation
Simplified Schematic
Connection Diagram
Dual-In-Line Package
C1995 National Semiconductor Corporation TL H 11735
Top View
TL H 11735 – 2
Order Number ADC1242CIJ
See NS Package Number J28A
TL H 11735 – 1
RRD-B30M115 Printed in U S A
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Absolute Maximum Ratings (Notes 1 2)
If Military Aerospace specified devices are required
please contact the National Semiconductor Sales
Office Distributors for availability and specifications
Supply Voltage (VCC e DVCC e AVCC)
Negative Supply Voltage (Vb)
6 5V
b6 5V
Voltage at Logic Control Inputs
b0 3V to (VCC a 0 3V)
Voltage at Analog Input (VIN) (Vb b0 3V) to (VCC a 0 3V)
AVCC-DVCC (Note 7)
0 3V
Input Current at any Pin (Note 3)
g5 mA
Package Input Current (Note 3)
g20 mA
Power Dissipation at 25 C (Note 4)
875 mW
Storage Temperature Range
b65 C to a150 C
ESD Susceptability (Note 5)
Soldering Information
J Package (10 seconds)
2000V
300 C
Operating Ratings (Notes 1 and 2)
Temperature Range
ADC1242CIJ
DVCC and AVCC Voltage
(Notes 6 and 7)
TMINsTAsTMAX
b40 CsTAsa85 C
4 5V to 5 5V
Negative Supply Voltage (Vb)
b4 5V to b5 5V
Reference Voltage
(VREF Notes 6 and 7)
3 5V to AVCC a 50 mV
Converter Electrical Characteristics
The following specifications apply for VCC e DVCC e AVCC e a5 0V Vb e b5 0V VREF e a4 096V and fCLK e 2 0 MHz
unless otherwise specified Boldface limits apply for TA e TJ e TMIN to TMAX all other limits TA e TJ e 25 C (Notes
6 7 and 8)
Symbol
Parameter
Conditions
Typical
Limit
Units
(Note 9) (Notes 10 18) (Limit)
STATIC CHARACTERISTICS
Positive Integral
Linearity Error
After Auto-Cal
(Notes 11 and 12)
g1 LSB(max)
Differential Linearity
After Auto-Cal (Notes 11 and 12)
12 Bits(min)
Zero Error
After Auto-Zero or Auto-Cal
(Notes 12 and 13)
g2 LSB(max)
Positive and Negative Full-Scale Error
After Auto-Cal (Note 12)
g3 LSB(max)
CREF
CIN
VIN
VREF Input Capacitance
Analog Input Capacitance
Analog Input Voltage
80
65
Power Supply
Sensitivity
Zero Error (Note 14) AVCC e DVCC e 5V g5%
Full-Scale Error VREF e 4 75V Vb e b5V g5%
g
g
Vb b 0 05
VCC a 0 05
pF
pF
V(min)
V(max)
LSB
LSB
Linearity Error
g LSB
DYNAMIC CHARACTERISTICS
S (NaD) Unipolar Signal-to-NoiseaDistortion
Ratio (Note 17)
S (NaD) Bipolar Signal-to-NoiseaDistortion
Ratio (Note 17)
Unipolar Full Power Bandwidth (Note 17)
Bipolar Full Power Bandwidth (Note 17)
tAp Aperture Time
Aperture Jitter
fIN e 1 kHz VIN e 4 85 Vp-p
fIN e 10 kHz VIN e 4 85 Vp-p
fIN e 1 kHz VIN e g4 85 Vp-p
fIN e 10 kHz VIN e g4 85 Vp-p
VIN e 0V to 4 85V
VIN e g4 85 Vp-p
72
72
76
76
32
25
100
100
dB
dB
dB
dB
kHz
kHz
ns
psrms
2
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Digital and DC Electrical Characteristics
The following specifications apply for VCC e DVCC e AVCC e a5 0V Vb e b5 0V VREF e a4 096V and fCLK e 2 0 MHz
unless otherwise specified Boldface limits apply for TA e TJ e TMIN to TMAX all other limits TA e TJ e 25 C
(Notes 6 and 7)
Symbol
VIN(1)
VIN(0)
IIN(1)
IIN(0)
VTa
VTb
VH
VOUT(1)
VOUT(0)
IOUT
ISOURCE
ISINK
DICC
AICC
Ib
Parameter
Logical ‘‘1’’ Input Voltage for
All Inputs except CLK IN
Logical ‘‘0’’ Input Voltage for
All Inputs except CLK IN
Logical ‘‘1’’ Input Current
Logical ‘‘0’’ Input Current
CLK IN Positive-Going
Threshold Voltage
CLK IN Negative-Going
Threshold Voltage
CLK IN Hysteresis
VTa(min) b VTb(max)
Logical ‘‘1’’ Output Voltage
Logical ‘‘0’’ Output Voltage
TRI-STATE Output Leakage
Current
Output Source Current
Output Sink Current
DVCC Supply Current
AVCC Supply Current
Vb Supply Current
Condition
VCC e 5 25V
VCC e 4 75V
VIN e 5V
VIN e 0V
VCC e 4 75V
IOUT e b360 mA
IOUT e b10 mA
VCC e 4 75V
IOUT e 1 6 mA
VOUT e 0V
VOUT e 5V
VOUT e 0V
VOUT e 5V
fCLK e 2 MHz CS e ‘‘1’’
fCLK e 2 MHz CS e ‘‘1’’
fCLK e 2 MHz CS e ‘‘1’’
Typical
(Note 9)
0 005
b0 005
28
21
07
b0 01
0 01
b20
20
1
28
28
Limit
(Notes 10 18)
20
08
1
b1
27
23
04
24
45
04
b3
3
b6 0
80
2
6
6
Units
(Limits)
V(min)
V(max)
mA(max)
mA(max)
V(min)
V(max)
V(min)
V(min)
V(min)
V(max)
mA(max)
mA(max)
mA(min)
mA(min)
mA(max)
mA(max)
mA(max)
3
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