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参数资料
| 型号： | ADC081500CIYB |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | ADC |
| 英文描述： | High Performance, Low Power, 8-Bit, 1.5 GSPS A/D Converter |
| 中文描述： | 1-CH 8-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQFP128 |
| 封装： | MS-026BFB, LQFP-128 |
| 文件页数： | 12/28页 |
| 文件大小： | 830K |
| 代理商： | ADC081500CIYB |
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Specification Definitions
APERTURE (SAMPLING) DELAY
is that time required after
the fall of the clock input for the sampling switch to open. The
Sample/Hold circuit effectively stops capturing the input sig-
nal and goes into the “hold” mode the aperture delay time
(t
AD
) after the input clock goes low.
APERTURE JITTER (t
AJ
)
is the variation in aperture delay
from sample to sample. Aperture jitter shows up as input
noise.
Bit Error Rate (B.E.R.)
is the probability of error and is
defined as the probable number of errors per unit of time
divided by the number of bits seen in that amount of time. A
B.E.R. of 10
-18
corresponds to a statistical error in one bit
about every four (4) years.
CLOCK DUTY CYCLE
is the ratio of the time that the clock
wave form is at a logic high to the total time of one clock
period.
DIFFERENTIAL NON-LINEARITY (DNL)
is the measure of
the maximum deviation from the ideal step size of 1 LSB.
Measured at 1.5 GSPS with a ramp input.
EFFECTIVE NUMBER OF BITS (ENOB, or EFFECTIVE
BITS)
is another method of specifying Signal-to-Noise and
Distortion Ratio, or SINAD. ENOB is defined as (SINAD
1.76) / 6.02 and says that the converter is equivalent to a
perfect ADC of this (ENOB) number of bits.
FULL POWER BANDWIDTH (FPBW)
is a measure of the
frequency at which the reconstructed output fundamental
drops 3 dB below its low frequency value for a full scale
input.
GAIN ERROR
is the deviation from the ideal slope of the
transfer function. It can be calculated from Offset and Full-
Scale Errors:
Positive Gain Error = Offset Error Positive Full-Scale
Error
Negative Gain Error = (Offset Error Negative Full-
Scale Error)
Gain Error = Negative Full-Scale Error Positive Full-
Scale Error = Positive Gain Error + Negative Gain Error
INTEGRAL NON-LINEARITY (INL)
is a measure of the
deviation of each individual code from a straight line through
the input to output transfer function. The deviation of any
given code from this straight line is measured from the
center of that code value. The best fit method is used.
INTERMODULATION DISTORTION (IMD)
is the creation of
additional spectral components as a result of two sinusoidal
frequencies being applied to theADC input at the same time.
it is defined as the ratio of the power in the second and third
order intermodulation products to the power in one of the
original frequencies. IMD is usually expressed in dBFS.
LSB (LEAST SIGNIFICANT BIT)
is the bit that has the
smallest value or weight of all bits. This value is
V
FS
/ 2
n
where V
is the differential full-scale amplitude of 650 mV
or 870 mV as set by the FSR input and "n" is the ADC
resolution in bits, which is 8 for the ADC081500.
LVDS DIFFERENTIAL OUTPUT VOLTAGE (V
OD
)
is the
absolute value of the difference between the V
D
+ & V
D
-
outputs; each measured with respect to Ground.
LVDS OUTPUT OFFSET VOLTAGE (V
OS
)
is the midpoint
between the D+ and D- pins output voltage; ie., [(V
D
+) +(
V
D
-)]/2.
MISSING CODES
are those output codes that are skipped
and will never appear at the ADC outputs. These codes
cannot be reached with any input value.
MSB (MOST SIGNIFICANT BIT)
is the bit that has the
largest value or weight. Its value is one half of full scale.
NEGATIVE FULL-SCALE ERROR (NFSE)
is a measure of
how far the last code transition is from the ideal 1/2 LSB
above a differential 435 mV with the FSR pin high, or 1/2
LSB above a differential 325 mV with the FSR pin low. For
the ADC081500 the reference voltage is assumed to be
ideal, so this error is a combination of full-scale error and
reference voltage error.
OFFSET ERROR (V
OFF
)
is a measure of how far the mid-
scale point is from the ideal zero voltage differential input.
Offset Error = Actual Input causing average of 8k
samples to result in an average code of 127.5.
OUTPUT DELAY (t
OD
)
is the time delay (in addition to
Pipeline Delay) after the falling edge of CLK+ before the data
update is present at the output pins.
OVER-RANGE RECOVERY TIME
is the time required after
the differential input voltages goes from
±
1.2V to 0V for the
converter to recover and make a conversion with its rated
accuracy.
PIPELINE DELAY (LATENCY)
is the number of input clock
cycles between initiation of conversion and when that data is
presented to the output driver stage. New data is available at
every clock cycle, but the data lags the conversion by the
Pipeline Delay plus the t
OD
.
POSITIVE FULL-SCALE ERROR (PFSE)
is a measure of
how far the last code transition is from the ideal 1-1/2 LSB
below a differential +435 mV with the FSR pin high, or 1-1/2
LSB below a differential +325 mV with the FSR pin low. For
the ADC081500 the reference voltage is assumed to be
ideal, so this error is a combination of full-scale error and
reference voltage error.
POWER SUPPLY REJECTION RATIO (PSRR)
can be one
of two specifications. PSRR1 (DC PSRR) is the ratio of the
change in full-scale error that results from a power supply
voltage change from 1.8V to 2.0V. PSRR2 (AC PSRR) is a
measure of how well an a.c. signal riding upon the power
supply is rejected from the output and is measured with a
248 MHz, 50 mV
P-P
signal riding upon the power supply. It is
the ratio of the output amplitude of that signal at the output to
its amplitude on the power supply pin. PSRR is expressed in
dB.
SIGNAL TO NOISE RATIO (SNR)
is the ratio, expressed in
dB, of the rms value of the input signal at the output to the
20153146
FIGURE 1.
A
www.national.com
12
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| ADC081500EVAL | High Performance, Low Power, 8-Bit, 1.5 GSPS A/D Converter |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADC081500CIYB/NOPB | 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| ADC081500DEV | 制造商:NSC 制造商全称:National Semiconductor 功能描述:High Performance, Low Power, 8-Bit, 1.5 GSPS A/D Converter |
| ADC081500EVAL | 制造商:NSC 制造商全称:National Semiconductor 功能描述:High Performance, Low Power, 8-Bit, 1.5 GSPS A/D Converter |
| ADC0816 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:8-Bit レP Compatible A/D Converters with 16-Channel Multiplexer |
| ADC0816_07 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:8-Bit レP Compatible A/D Converters with 16-Channel Multiplexer |
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