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ADC12130CIN Schematic ( PDF Datasheet ) - National Semiconductor

Teilenummer ADC12130CIN
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
ADC12130CIN Datasheet, Funktion
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.
COPSmicrocontrollers, HPCand MICROWIREare trademarks of National Semiconductor Corporation.
© 2000 National Semiconductor Corporation DS012079
DS012079-1
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ADC12130CIN Datasheet, Funktion
Converter Electrical Characteristics
The following specifications apply for
common-mode voltage) or (V+ = VA+
(V+ = VA+ = VD+ = +5V, VREF+ = +4.096V, and fully differential input with
= VD+ = 3.3V, VREF+ = +2.5V and fully-differential input with fixed 1.250V
fixed
2.048V
common-mode voltage), VREF− = 0V, 12-bit + sign conversion mode, source impedance for analog inputs, VREF− and VREF+
25, 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) (Continued)
Symbol
Parameter
Conditions
Typical
(Note 10)
Limits
Units
(Note 11) (Limits)
STATIC CONVERTER CHARACTERISTICS (Continued)
Multiplexer Channel to Channel
±0.05
LSB
Matching
Power Supply Sensitivity
V+ = +5V ±10%
Offset Error
VREF = +4.096V
±0.5
LSB
+ Full-Scale Error
±0.5
LSB
− Full-Scale Error
±0.5
LSB
+ Integral Linearity Error
±0.5
LSB
− Integral Linearity Error
±0.5
LSB
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
Distortion Ratio
−3 dB Full Power Bandwidth
fIN = 1 kHz, VIN = ±5V, VREF+ = 5.0V
fIN = 20 kHz, VIN = ±5V, VREF+ = 5.0V
fIN = 40 kHz, VIN = ±5V, VREF+ = 5.0V
VIN = ±5V, where S/(N+D) drops 3 dB
77.0
73.9
67.0
40
dB
dB
dB
kHz
Electrical Characteristics
The following specifications apply for
common-mode voltage) or (V+ = VA+
(V+ = VA+ = VD+ = +5V, VREF+ = +4.096V, and fully differential input with
= VD+ = +3.3V, VREF+ = 2.5V and fully-differential input with fixed 1.250V
fixed
2.048V
common-mode voltage), VREF− = 0V, 12-bit + sign conversion mode, source impedance for analog inputs, VREF− and VREF+
25, 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
Limits
Units
(Note 10)
(Note 11)
(Limits)
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 = +5.0V or
VIN = 0V
±0.1
GND − 0.05
µA
V
CCH CH0–CH7 and COM Input
Capacitance
VA+ + 0.05
10
pF
CMUXOUT
MUX Output Capacitance
Off Channel Leakage (Note 16)
On Channel = 5V and
20
−0.01
pF
µA
CH0–CH7 and COM Pins
Off Channel = 0V
On Channel = 0V and
0.01
µA
Off Channel = 5V
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ADC12130CIN pdf, datenblatt
AC Electrical Characteristics (Continued)
DS012079-6
FIGURE 2. Simplified Error Curve vs Output Code without Auto-Calibration or Auto-Zero Cycles
FIGURE 3. Simplified Error Curve vs Output Code after Auto-Calibration Cycle
DS012079-7
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DS012079-8
FIGURE 4. Offset or Zero Error Voltage
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