參數(shù)資料
型號(hào)： AD7658BSTZ
廠商： ANALOG DEVICES INC
元件分類： ADC
英文描述： 250 kSPS, 6-Channel,Simultaneous Sampling, Bipolar 12/14/16-Bit ADC
中文描述： 6-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL/PARALLEL ACCESS, PQFP64
封裝： ROHS COMPLIANT, MS-026BCD, LQFP-64
文件頁(yè)數(shù)： 14/25頁(yè)
文件大?。?/td> 308K
代理商： AD7658BSTZ
AD7658/AD7657/AD7656
Preliminary Technical Data
TERMINOLOGY
Integral Nonlinearity
This is the maximum deviation from a straight line passing
through the endpoints of the ADC transfer function. The
endpoints of the transfer function are zero scale, a point 1/2 LSB
below the first code transition, and full scale, a point 1/2 LSB
above the last code transition.
Rev. PrI | Page 14 of 25
Differential Nonlinearity
This is the difference between the measured and the ideal 1 LSB
change between any two adjacent codes in the ADC.
Bipolar Zero Code Error
It is the deviation of the midscale transition (all 1s to all 0s)
from the ideal V
IN
voltage, i.e., AGND - 1 LSB.
Positive Full Scale Error
It is the deviation of the last code transition (011…110) to
(011…111) from the ideal ( +4 x V
REF
- 1 LSB, + 2 x V
REF
– 1
LSB) after the bipolar Zero Code Error has been adjusted out.
Negative Full Scale Error
This is the deviation of the first code transition (10…000) to
(10…001) from the ideal (i.e., - 4 x V
REF
+ 1 LSB, - 2 x V
REF
+ 1
LSB) after the Bipolar Zero Code Error has been adjusted out.
Track-and-Hold Acquisition Time
The track-and-hold amplifier returns to track mode at the end
of conversion. The track-and-hold acquisition time is the time
required for the output of the track-and-hold amplifier to reach
its final value, within ±1 LSB, after the end of the conversion.
See the Track-and-Hold Section for more details.
Signal-to-(Noise + Distortion) Ratio
This is the measured ratio of signal-to-(noise + distortion) at
the output of the ADC. The signal is the rms amplitude of the
fundamental. Noise is the sum of all nonfundamental signals up
to half the sampling frequency (
f
S
/2, excluding dc). The ratio
depends on the number of quantization levels in the digitization
process; the more levels, the smaller the quantization noise. The
theoretical signal-to-(noise + distortion) ratio for an ideal N-bit
converter with a sine wave input is given by
Signal-to-
(
Noise + Distortion
) = (6.02
N
+ 1.76)
dB
Thus, for a 12-bit converter, this is 74 dB, for a 14-bit converter,
this is 86 dB and for a 16-bit converter, this is 98 dB.
Total Harmonic Distortion (THD)
THD is the ratio of the rms sum of harmonics to the
fundamental. For the AD7658/AD7657/AD7656, it is defined as
1
2
6
2
5
2
4
2
3
2
2
log
20
)
(
V
V
V
V
V
V
dB
THD
+
+
+
+
=
where
V
1
is the rms amplitude of the fundamental and
V
2
,
V
3
,
V
4
,
V
5
, and
V
6
are the rms amplitudes of the second through the
sixth harmonics.
Peak Harmonic or Spurious Noise
Peak harmonic or spurious noise is defined as the ratio of the
rms value of the next largest component in the ADC output
spectrum (up to
f
S
/2, excluding dc) to the rms value of the
fundamental. Normally, the value of this specification is
determined by the largest harmonic in the spectrum, but for
ADCs where the harmonics are buried in the noise floor, it will
be a noise peak.
Intermodulation Distortion
With inputs consisting of sine waves at two frequencies, fa and fb,
any active device with nonlinearities will create distortion
products at sum and difference frequencies of mfa ± nfb where
m
,
n
= 0, 1, 2, 3. Intermodulation distortion terms are those for which
neither
m
nor
n
are equal to zero. For example, the second-order
terms include (fa + fb) and (fa fb), while the third-order terms
include (2fa + fb), (2fa fb), (fa + 2fb), and (fa 2fb).
The AD7658/AD7657/AD7656 is tested using the CCIF
standard where two input frequencies near the top end of the
input bandwidth are used. In this case, the second-order terms
are usually distanced in frequency from the original sine waves,
while the third-order terms are usually at a frequency close to
the input frequencies. As a result, the second- and third-order
terms are specified separately. The calculation of the
intermodulation distortion is as per the THD specification
where it is the ratio of the rms sum of the individual distortion
products to the rms amplitude of the sum of the fundamentals
expressed in dBs.
相關(guān)PDF資料
PDF描述
AD7658BSTZ-REEL 250 kSPS, 6-Channel,Simultaneous Sampling, Bipolar 12/14/16-Bit ADC
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AD767 Microprocessor-Compatible 12-Bit D/A Converter(12位μP兼容DAC)
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AD7684BRM 16-Bit, 100 kSPS PulSAR Differential ADC in MSOP
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AD7658BSTZ-1 功能描述:IC ADC 12BIT 6CH 250KSPS 64LQFP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 其它有關(guān)文件:TSA1204 View All Specifications 標(biāo)準(zhǔn)包裝:1 系列:- 位數(shù):12 采樣率（每秒）:20M 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:2 功率耗散（最大）:155mW 電壓電源:模擬和數(shù)字 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-TQFP 供應(yīng)商設(shè)備封裝:48-TQFP（7x7） 包裝:Digi-Reel® 輸入數(shù)目和類型:4 個(gè)單端，單極；2 個(gè)差分，單極 產(chǎn)品目錄頁(yè)面:1156 (CN2011-ZH PDF) 其它名稱:497-5435-6
AD7658BSTZ-1-RL 功能描述:IC ADC 12BIT 6CH 250KSPS 64LQFP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:1,000 系列:- 位數(shù):12 采樣率（每秒）:300k 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:75mW 電壓電源:單電源 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:24-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:24-SOIC 包裝:帶卷 (TR) 輸入數(shù)目和類型:1 個(gè)單端，單極；1 個(gè)單端，雙極
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AD7658YSTZ 功能描述:IC ADC 12BIT 6CH 250KSPS 64-LQFP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 其它有關(guān)文件:TSA1204 View All Specifications 標(biāo)準(zhǔn)包裝:1 系列:- 位數(shù):12 采樣率（每秒）:20M 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:2 功率耗散（最大）:155mW 電壓電源:模擬和數(shù)字 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-TQFP 供應(yīng)商設(shè)備封裝:48-TQFP（7x7） 包裝:Digi-Reel® 輸入數(shù)目和類型:4 個(gè)單端，單極；2 個(gè)差分，單極 產(chǎn)品目錄頁(yè)面:1156 (CN2011-ZH PDF) 其它名稱:497-5435-6
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