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參數(shù)資料
| 型號： | ADC12191CIVT |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | ADC |
| 英文描述： | 12-Bit, 10 MHz Self-Calibrating, Pipelined A/D Converter with Internal Sample & Hold |
| 中文描述： | 1-CH 12-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQFP32 |
| 封裝： | TQFP-32 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大小： | 278K |
| 代理商： | ADC12191CIVT |
Timing Diagrams
(Continued)
Functional Description
The ADC12191 is a monolithic CMOS analog-to-digital con-
verter capable of converting analog input signals into 12-bit
digital words at 10 megasamples per second (MSPS). This
device utilizes a proprietary pipeline architecture and algo-
rithm to minimize die size and power consumption. The
ADC12191 uses self-calibration and digital error correction
to maintain accuracy and performance over temperature.
The ADC12191 has an input sample-and-hold amplifier and
internal reference buffer. The analog input and the reference
voltage are converted to differential signals for internal use.
Using differential signals in the analog conversion core re-
duces crosstalk and noise pickup from the digital section and
power supply.
The pipeline conversion core has 15 sequential signal pro-
cessing stages. Each stage receives an analog signal from
the previous stage (called “residue”) and produces a 1-bit
digital output that is sent to the digital correction module. At
each stage the analog signal received from the previous
stage is compared to an internally generated reference level.
It is then amplified by a factor of 2, and, depending on the
output of the comparator, the internal reference signal may
be subtracted from the amplifier output. This produces the
residue that is passed to the next stage.
The calibration module is activated at power-on or by user
request. During calibration the conversion core is put into a
special mode of operation in order to determine inherent er-
rors in the analog conversion blocks and to determine cor-
rection coefficients for each digital output bit from the con-
version core and stores these coefficients in RAM. The
digital correction module uses the coefficients in RAM to
convert the raw data bits from the conversion core into the
12-bit digital output code.
Applications Information
1.0 Analog Inputs.
The ADC12191 has two single-ended analog inputs. V
REF
is
the reference input and V
IN
is the signal input.
1.1 Reference Input
The V
REF
input must be driven from an
accurate, stable reference voltage source. of 1.8V to 2.2V,
and bypassed to a clean, quiet point in analog ground.
1.2 Analog Signal Input
The V
input must be driven with
a low impedance signal source that does not add any distor-
tion to the input signal. The ground reference for the V
in-
put is the V
pin. The V
pin must be connected to
a clean, quiet point in analog ground.
2.0 Digital Inputs
The ADC12191 has four digital inputs. They are CLOCK,
CAL, OE and PD.
2.1 CLOCK
The CLOCK signal drives an internal phase de-
lay loop to create timing for the ADC. The clock input should
be driven with a stable, low phase jitter TTL level clock signal
in the range of 1 to 10 MHz. The trace carrying the clock sig-
nal should be as short as possible. This trace should not
cross any other signal line, analog or digital, not even at 90.
A 100 Ohm resistor should be placed in series with the
CLOCK pin, as close to the pin as possible.
2.2 CAL
The level sensitive CAL input must be pulsed high
for at least three clock cycles to begin ADC calibration. For
best performance, calibration should be performed about ten
sceonds after power up, after resetting the ADC, and after
the temperature has changed by more than 50C since the
last calibration was performed.
Calibration should be performed at the same clock fre-
quency that the ADC12191 will be used for conversions to
minimize offset errors. Calibration takes 4000 clock cycles.
Irrelevant data may appear during the calibration cycle.
DS101040-22
FIGURE 4. Reset and Calibration Timing
A
www.national.com
11
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| ADC121C021CIMKX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:I2C-Compatible, 12-Bit Analog-to-Digital Converter (ADC) with Alert Function |
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