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ADC1230 Schematic ( PDF Datasheet ) - National Semiconductor

Teilenummer ADC1230
Beschreibung 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 30 Seiten
ADC1230 Datasheet, Funktion
July 1999
ADC12H030/ADC12H032/ADC12H034/ADC12H038,
ADC12030/ADC12032/ADC12034/ADC12038
Self-Calibrating 12-Bit Plus Sign Serial I/O A/D
Converters with MUX and Sample/Hold
General Description
The ADC12030, and ADC12H030 families are 12-bit plus
sign successive approximation A/D converters with serial I/O
and configurable input multiplexers. The ADC12032/
ADC12H032, ADC12034/ADC12H034 and ADC12038/
ADC12H038 have 2, 4 and 8 channel multiplexers, respec-
tively. The differential multiplexer outputs and A/D inputs are
available on the MUXOUT1, MUXOUT2, A/DIN1 and A/DIN2
pins. The ADC12030/ADC12H030 has a two channel multi-
plexer with the multiplexer outputs and A/D inputs internally
connected. The ADC12030 family is tested with a 5 MHz
clock, while the ADC12H030 family is tested with an 8 MHz
clock. On request, these A/Ds go through a self calibration
process that adjusts linearity, zero and full-scale errors to
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 MICROWIRE. For voltage references see the
LM4040 or LM4041.
Features
n Serial I/O (MICROWIRE 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 4.096V reference
n 0V to 5V analog input range with single 5V power
supply
n No Missing Codes over temperature
Key Specifications
n Resolution
n 12-bit plus sign conversion time
— ADC12H030 family
— ADC12030 family
n 12-bit plus sign throughput time
— ADC12H030 family
— ADC12030 family
n Integral linearity error
n Single supply
n Power dissipation
— Power down
12-bit plus sign
5.5 µs (max)
8.8 µs (max)
8.6 µs (max)
14 µs (max)
±1 LSB (max)
5V ±10%
33 mW (max)
100 µW (typ)
Applications
n Medical instruments
n Process control systems
n Test equipment
TRI-STATE® is a registered trademark of National Semiconductor Corporation.
COPSmicrocontrollers, HPCand MICROWIREare trademarks of National Semiconductor Corporation.
© 1999 National Semiconductor Corporation DS011354
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ADC1230 Datasheet, Funktion
Converter Electrical Characteristics (Continued)
The
sion
following specifications apply
mode, fCK = fSK = 8 MHz for
for V+ = VA+ = VD+ = +5.0 VDC, VREF+ = +4.096 VDC, VREF= 0
the ADC12H030, ADC12H032, ADC12H034 and ADC12H038, fCK
V=DfCS,K1=2-5biMt +Hszigfonr
conver-
the
ADC12030, ADC12032, ADC12034 and ADC12038, RS = 25, source impedance for VREF+ and VREF25, fully-differential
input with fixed 2.048V 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
Offset Error
8-bit + sign mode,
after Auto-Zero (Note 13)
±1/2
LSB (max)
TUE
Total Unadjusted Error
VIN(+) = VIN(−) = + 2.048V
8-bit + sign mode
after Auto-Zero
±3/4
LSB (max)
(Notes 12, 13, 14)
Multiplexer Channel
to Channel Matching
±0.05
LSB
Power Supply Sensitivity
V+ = +5V ±10%
VREF = +4.096V
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
fIN = 1 kHz, VIN = 5 VPP, VREF+ = 5.0V
Distortion Ratio
fIN = 20 kHz, VIN = 5 VPP, VREF+ = 5.0V
fIN = 40 kHz, VIN = 5 VPP, VREF+ = 5.0V
−3 dB Full Power Bandwidth
VIN = 5 VPP, where S/(N+D) drops 3 dB
DIFFERENTIAL DYNAMIC CONVERTER CHARACTERISTICS
69.4
68.3
65.7
31
dB
dB
dB
kHz
S/(N+D) Signal-to-Noise Plus
fIN = 1 kHz, VIN = ±5V, VREF+ = 5.0V
Distortion Ratio
fIN = 20 kHz, VIN = ±5V, VREF+ = 5.0V
fIN = 40 kHz, VIN = ±5V, VREF+ = 5.0V
−3 dB Full Power Bandwidth
VIN = ±5V, where S/(N+D) drops 3 dB
REFERENCE INPUT, ANALOG INPUTS AND MULTIPLEXER CHARACTERISTICS
77.0
73.9
67.0
40
dB
dB
dB
kHz
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
VIN = +5.0V or
VIN = 0V
±0.1
±1.0
µA (max)
GND − 0.05 V (min)
Input Voltage
CCH CH0–CH7 and COM
Input Capacitance
VA+ + 0.05 V (max)
10 pF
CMUXOUT MUX Output Capacitance
20 pF
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ADC1230 pdf, datenblatt
AC Electrical Characteristics (Continued)
FIGURE 3. Simplified Error Curve vs Output Code after Auto-Calibration Cycle
DS011354-12
DS011354-13
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 Clock Frequency
Linearity Error Change
vs Temperature
Linearity Error Change
vs Reference Voltage
DS011354-53
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DS011354-54
12
DS011354-55

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