ADC12138 Datasheet PDF - National Semiconductor
| Part Number | ADC12138 | |
| Description | Self-Calibrating 12-Bit Plus Sign Serial I/O A/D Converters with MUX and Sample/Hold | |
| Manufacturers | National Semiconductor | |
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March 2000
ADC12130/ADC12132/ADC12138
Self-Calibrating 12-Bit Plus Sign Serial I/O A/D
Converters with MUX and Sample/Hold
General Description
The ADC12130, ADC12132 and ADC12138 are 12-bit plus
sign successive approximation A/D converters with serial I/O
and configurable input multiplexer. The ADC12132 and
ADC12138 have a 2 and an 8 channel multiplexer, respec-
tively. The differential multiplexer outputs and A/D inputs are
available on the MUXOUT1, MUXOUT2, A/DIN1 and A/DIN2
pins. The ADC12130 has a two channel multiplexer with the
multiplexer outputs and A/D inputs internally connected. The
ADC12130 family is tested with a 5 MHz clock. On request,
these A/Ds go through a self calibration process that adjusts
linearity, zero and full-scale errors to typically less than ±1
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 +5V) can be accommodated with a single
+5V supply. In the differential modes, valid outputs are ob-
tained even when the negative inputs are greater than the
positive because of the 12-bit plus sign output data format.
The serial I/O is configured to comply with the NSC MI-
CROWIRE™. For voltage references, see the LM4040 or
LM4041.
Features
n Serial I/O (MICROWIRE, SPI and QSPI Compatible)
n 2 or 8 channel differential or single-ended multiplexer
n Analog input sample/hold function
n Power down mode
n Programmable acquisition time
n Variable digital output word length and format
n No zero or full scale adjustment required
n 0V to 5V analog input range with single 5V power
supply
Key Specifications
n Resolution: 12-bit plus sign
n 12-bit plus sign conversion time: 8.8 µs (max)
n 12-bit plus sign throughput time: 14 µs (max)
n Integral linearity error: ±2 LSB (max)
n Single supply: 3.3V or 5V ±10%
n Power consumption
— 3.3V
15 mW (max)
— 3.3V power down
40 µW (typ)
— 5V
33 mW (max)
— 5V power down
100 µW (typ)
Applications
n Pen-based computers
n Digitizers
n Global positioning systems
ADC12138 Simplified Block Diagram
TRI-STATE® is a registered trademark of National Semiconductor Corporation.
COPS™ microcontrollers, HPC™ and MICROWIRE™ are trademarks of National Semiconductor Corporation.
© 2000 National Semiconductor Corporation DS012079
DS012079-1
www.national.com
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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.
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)
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
Storage Temperature
−65˚C to +150˚C
Operating Ratings (Notes 1, 2)
Operating Temperature Range
ADC12130CIN, ADC12130CIWM,
ADC12132CIMSA,
ADC12138CIMSA,
ADC12138CIN, ADC12138CIWM
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
0.1 VA+ to 0.6 VA+
0V to VA+
0V to VA+
Converter Electrical Characteristics
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2.048V
VREF+ ≤
25Ω, fCK = fSK = 5 MHz, and 10 (tCK) acquisition time unless otherwise specified. Boldface limits apply for TA = TJ = TMIN
to TMAX; all other limits TA = TJ = 25˚C. (Notes 7, 8, 9)
Symbol
Parameter
Conditions
Typical
(Note 10)
Limits
(Note 11)
Units
(Limits)
STATIC CONVERTER CHARACTERISTICS
Resolution
12 + sign Bits (min)
+ILE
Positive Integral Linearity Error After Auto-Cal (Notes 12, 18)
±1/2
±2 LSB (max)
−ILE
Negative Integral Linearity Error After Auto-Cal (Notes 12, 18)
±1/2
±2 LSB (max)
DNL
Differential Non-Linearity
After Auto-Cal
±1.5
LSB (max)
Positive Full-Scale Error
After Auto-Cal (Notes 12, 18)
±1/2
±3.0
LSB (max)
Negative Full-Scale Error
After Auto-Cal (Notes 12, 18)
±1/2
±3.0
LSB (max)
Offset Error
After Auto-Cal (Notes 5, 18)
±1/2
±2 LSB (max)
DC Common Mode Error
VIN(+) = VIN(−) = 2.048V
After Auto-Cal (Note 15)
±2
LSB (max)
TUE
Total Unadjusted Error
After Auto-Cal
±1 LSB
(Notes 12, 13, 14)
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| Information | Total 30 Pages | |
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