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PDF ADC12L032CIWM Data sheet ( Hoja de datos )
| Número de pieza | ADC12L032CIWM | |
| Descripción | 3.3V Self-Calibrating 12-Bit Plus Sign Serial I/O A/D Converters with MUX and Sample/Hold | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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June 1999
ADC12L030/ADC12L032/ADC12L034/ADC12L038
3.3V Self-Calibrating 12-Bit Plus Sign Serial I/O A/D
Converters with MUX and Sample/Hold
General Description
The ADC12L030 family is 12-bit plus sign successive ap-
proximation A/D converters with serial I/O and configurable
input multiplexers. These devices are fully tested with a
single 3.3V power supply. The ADC12L032, ADC12L034 and
ADC12L038 have 2, 4 and 8 channel multiplexers, respec-
tively. Differential multiplexer outputs and A/D inputs are
available on the MUXOUT1, MUXOUT2, A/DIN1 and A/DIN2
pins. The ADC12L030 has a two channel multiplexer with the
multiplexer outputs and A/D inputs internally connected. On
request, these A/Ds go through a self calibration process
that adjusts linearity, zero and full-scale errors to less than
±1⁄2 LSB each.
The analog inputs can be configured to operate in various
combinations of single-ended, differential, or
pseudo-differential modes. A fully differential unipolar analog
input range (0V to +3.3V) can be accommodated with a
single +3.3V supply. In the differential modes, valid outputs
are obtained even when the negative inputs are greater than
the positive because of the 12-bit plus sign two’s compliment
output data format.
The serial I/O is configured to comply with NSC’s
MICROWIRE™ and Motorola’s SPI standards. For voltage
references, see the LM4040 or LM4041 data sheets.
Features
n 0V to 3.3V analog input range with single 3.3V power
supply
n Serial I/O ( MICROWIRE and SPI Compatible)
n 2, 4, or 8 channel differential or single-ended multiplexer
n Analog input sample/hold function
n Power down mode
n Variable resolution and conversion rate
n Programmable acquisition time
n Variable digital output word length and format
n No zero or full scale adjustment required
n Fully tested and guaranteed with a 2.5V reference
n No Missing Codes over temperature
Key Specifications
n Resolution
n 12-bit plus sign conversion time
n 12-bit plus sign sampling rate
n Integral linearity error
n Single supply
n Power dissipation
n Power down
12-bit plus sign
8.8 µs (min)
73 kHz (max)
±1 LSB (max)
3.3V ±10%
15 mW (max)
40 µW (typ)
Applications
n Portable Medical instruments
n Portable computing
n Portable Test equipment
ADC12L038 Simplified Block Diagram
TRI-STATE® is a registered trademark of National Semiconductor Corporation.
COPS™ microcontrollers, HPC™ and MICROWIRE™ are trademarks of National Semiconductor Corporation.
Microsoft™ is a trademark of Microsoft Corporation.
© 1999 National Semiconductor Corporation DS011830
DS011830-1
www.national.com
1 page  
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.
Positive Supply Voltage
(V+ = VA+ = VD+)
Voltage at Inputs and Outputs
except CH0–CH7 and COM
Voltage at Analog Inputs
CH0–CH7 and COM
|VA+ − VD+|
Input Current at Any Pin (Note 3)
Package Input Current (Note 3)
Package Dissipation at
TA = 25˚C (Note 4)
ESD Susceptability (Note 5)
Human Body Model
Soldering Information
N Packages (10 seconds)
SO Package (Note 6):
Vapor Phase (60 seconds)
Infrared (15 seconds)
Storage Temperature
6.5V
−0.3V to V+ +0.3V
GND −5V to V+ +5V
300 mV
±30 mA
±120 mA
500 mW
1500V
260˚C
215˚C
220˚C
−65˚C to +150˚C
Operating Ratings (Notes 1, 2)
Operating Temperature Range
ADC12L030CIWM,
ADC12L032CIWM,
ADC12L034CIWM,
ADC12L038CIWM
Supply Voltage
(V+ = VA+ = VD+)
|VA+ − VD+|
VREF+
VREF−
VREF (VREF+ − VREF−)
VREF Common Mode Voltage Range
TMIN ≤ TA ≤ TMAX
−40˚C ≤ TA ≤ +85˚C
+3.0V to +5.5V
≤ 100 mV
0V to VA+
0V to VREF+
1V to VA+
A/DIN1, A/DIN2, MUXOUT1
and MUXOUT2 Voltage Range
A/D IN Common Mode Voltage Range
0V to VA+
Converter Electrical Characteristics
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Symbol
Parameter
Conditions
Typical
(Note 10)
Limits
(Note 11)
Units
(Limits)
STATIC CONVERTER CHARACTERISTICS
Resolution with No Missing Codes
12 + sign Bits (min)
+ILE
Positive Integral Linearity Error
After Auto-Cal (Notes 12, 18)
±1/2
±1 LSB (max)
−ILE
Negative Integral Linearity Error
After Auto-Cal (Notes 12, 18)
±1/2
±1 LSB (max)
DNL
Differential Non-Linearity
After Auto-Cal
±1 LSB (max)
Positive Full-Scale Error
After Auto-Cal (Notes 12, 18)
±1/2
±2 LSB (max)
Negative Full-Scale Error
After Auto-Cal (Notes 12, 18)
±1/2
±2 LSB (max)
Offset Error
After Auto-Cal (Notes 5, 18)
±1/2
±2 LSB (max)
DC Common Mode Error
VIN(+) = VIN (−) = 1.250V
After Auto-Cal (Note 15)
±2
±3.5
LSB (max)
TUE
Total Unadjusted Error
After Auto-Cal
±1
LSB
(Notes 12, 13, 14)
Resolution with No Missing Codes
8-bit + sign mode
8 + sign
Bits (min)
+INL
Positive Integral Linearity Error
8-bit + sign mode (Note 12)
±1/2
LSB (max)
−INL
Negative Integral Linearity Error
8-bit + sign mode (Note 12)
±1/2
LSB (max)
DNL
Differential Non-Linearity
8-bit + sign mode
±3/4
LSB (max)
Positive Full-Scale Error
8-bit + sign mode (Note 12)
±1/2
LSB (max)
Negative Full-Scale Error
8-bit + sign mode (Note 12)
±1/2
LSB (max)
Offset Error
8-bit + sign mode,
after Auto-Zero (Note 13)
±1/2
LSB (max)
TUE
Total Unadjusted Error
VIN(+) = VIN(−) = + 1.250V
8-bit + sign mode
after Auto-Zero
±3/4
LSB (max)
(Notes 12, 13, 14)
5 www.national.com
5 Page 
AC Electrical Characteristics (Continued)
FIGURE 1. Transfer Characteristic
DS011830-7
DS011830-8
FIGURE 2. Simplified Error Curve vs Output Code without Auto-Calibration or Auto-Zero Cycles
11 www.national.com
11 Page | ||
| Páginas | Total 36 Páginas | |
| PDF Descargar | [ Datasheet ADC12L032CIWM.PDF ] | |
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