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ADC12L032CIWM Schematic ( PDF Datasheet ) - National Semiconductor

Teilenummer ADC12L032CIWM
Beschreibung 3.3V Self-Calibrating 12-Bit Plus Sign Serial I/O A/D Converters with MUX and Sample/Hold
Hersteller National Semiconductor
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Gesamt 36 Seiten
ADC12L032CIWM Datasheet, Funktion
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
±12 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
MICROWIREand 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.
COPSmicrocontrollers, HPCand MICROWIREare trademarks of National Semiconductor Corporation.
Microsoftis a trademark of Microsoft Corporation.
© 1999 National Semiconductor Corporation DS011830
DS011830-1
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ADC12L032CIWM Datasheet, Funktion
Converter Electrical Characteristics (Continued)
The
sion
following specifications apply for
mode, fCK = fSK = 5 MHz, RS =
V+ =
25,
VA+ = VD+ = +3.3
source impedance
VDC, VREF+ =
for VREF+ and
+2.500 VDC, VREF= 0 VDC, 12-bit
VREF25, fully-differential input
+ sign conver-
with fixed
1.250V common-mode voltage, 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
Multiplexer Channel to Channel
±0.05
LSB
Matching
Power Supply Sensitivity
V+ = +3.3V ±10%
Offset Error
±0.5
±1 LSB (max)
+ Full-Scale Error
±0.5
±1.5
LSB (max)
− Full-Scale Error
±0.5
±1.5
LSB (max)
+ Integral Linearity Error
±0.5
LSB
− Integral Linearity Error
±0.5
LSB
Output Data from
(Note 20)
+10 LSB (max)
“12-Bit Conversion of Offset”
−10 LSB (min)
(see Table 5)
Output Data from
(Note 20)
4095
LSB (max)
“12-Bit Conversion of Full-Scale”
4093
LSB (min)
(see Table 5)
UNIPOLAR DYNAMIC CONVERTER CHARACTERISTICS
S/(N+D) Signal-to-Noise Plus
Distortion Ratio
−3 dB Full Power Bandwidth
fIN = 1 kHz, VIN = 2.5 VPP
fIN = 20 kHz, VIN = 2.5 VPP
fIN = 40 kHz, VIN = 2.5 VPP
VIN = 2.5 VPP, where S/(N+D)
drops 3 dB
69.4
68.3
65.7
31
dB
dB
dB
kHz
DIFFERENTIAL DYNAMIC CONVERTER CHARACTERISTICS
S/(N+D) Signal-to-Noise Plus
Distortion Ratio
−3 dB Full Power Bandwidth
fIN = 1 kHz, VIN = ±2.5V
fIN = 20 kHz, VIN = ±2.5V
fIN = 40 kHz, VIN = ±2.5V
VIN = ±2.5V, where S/(N+D)
drops 3 dB
77.0
73.9
67.0
40
dB
dB
dB
kHz
REFERENCE INPUT, ANALOG INPUTS AND MULTIPLEXER CHARACTERISTICS
CREF
CA/D
Reference Input Capacitance
A/DIN1 and A/DIN2 Analog Input
Capacitance
85 pF
75 pF
A/DIN1 and A/DIN2 Analog Input
Leakage Current
CH0–CH7 and COM Input Voltage
VIN = +3.3V or
VIN = 0V
±0.1
±1.0
µA (max)
GND − 0.05 V (min)
CCH CH0–CH7 and COM Input
Capacitance
VA+ + 0.05
V (max)
10 pF
CMUXOUT MUX Output Capacitance
Off Channel Leakage (Note 16)
On Channel = 3.3V and
20
−0.01
−0.3
pF
µA (min)
CH0–CH7 and COM Pins
Off Channel = 0V
On Channel = 0V and
0.01 0.3 µA (max)
Off Channel = 3.3V
On Channel Leakage (Note 16)
On Channel = 3.3V and
0.01 0.3 µA (max)
CH0–CH7 and COM Pins
Off Channel = 0V
On Channel = 0V and
−0.01
−0.3
µA (min)
Off Channel = 3.3V
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ADC12L032CIWM pdf, datenblatt
AC Electrical Characteristics (Continued)
FIGURE 3. Simplified Error Curve vs Output Code after Auto-Calibration Cycle
DS011830-9
DS011830-10
FIGURE 4. Offset or Zero Error Voltage
Typical Performance Characteristics The following curves apply for 12-bit + sign mode after
auto-calibration unless otherwise specified. The performance for 8-bit + sign mode is equal to or better than shown. (Note 9)
Linearity Error Change
vs Temperature
Full-Scale Error Change
vs Temperature
Full-Scale Error Change
vs Supply Voltage
DS011830-51
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DS011830-52
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DS011830-53

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