- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄10301 > AD7938BCPZ-6REEL7 (Analog Devices Inc)IC ADC 12BIT 8CH 625KSPS 32LFCSP PDF資料下載
參數(shù)資料
| 型號： | AD7938BCPZ-6REEL7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 4/32頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 12BIT 8CH 625KSPS 32LFCSP |
| 標準包裝： | 1,500 |
| 位數(shù)： | 12 |
| 采樣率（每秒）： | 625k |
| 數(shù)據(jù)接口： | 并聯(lián) |
| 轉換器數(shù)目： | 1 |
| 功率耗散（最大）： | 7.5mW |
| 電壓電源： | 單電源 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 32-VFQFN 裸露焊盤，CSP |
| 供應商設備封裝： | 32-LFCSP-VQ |
| 包裝： | 帶卷 (TR) |
| 輸入數(shù)目和類型： | 8 個單端，單極；4 個差分，單極；4 個偽差分，單極；7 偽差分，單極 |
| 配用： | EVAL-AD7938CBZ-ND - EVAL BOARD FOR AD7938 |
第1頁第2頁第3頁當前第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁
AD7938-6
Data Sheet
Rev. C | Page 12 of 32
()
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 ±1/2 LSB, after the end of conversion.
Signal to Noise and Distortion Ratio (SINAD)
This is the measured ratio of signal-to-noise and 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 (fSAMPLE/2), excluding dc. The
ratio is dependent on the number of quantization levels in the
digitization process; the more levels, the smaller the
quantization noise.
The theoretical SINAD ratio for an ideal N-bit converter with a
sine wave input is given by
SINAD = (6.02 N + 1.76) dB
Thus, for a 12-bit converter, SINAD is 74 dB.
Total Harmonic Distortion (THD)
THD is the ratio of the rms sum of harmonics to the
fundamental. For the AD7938-6, it is defined as:
+
=
1
6
5
4
3
2
V
THD
2
log
20
dB
where:
V1 is the rms amplitude of the fundamental.
V2, V3, V4, V5, and V6 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 fSAMPLE/2 and 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 is a
noise peak.
Intermodulation Distortion
With inputs consisting of sine waves at two frequencies, fa and
fb, any active device with nonlinearities creates distortion
products at sum and difference frequencies of mfa ± nfb where
m, n = 0, 1, 2, 3, and so on. Intermodulation distortion terms
are those for which neither m nor n are equal to 0. For example,
the second-order terms include (fa + fb) and (fa fb), and the
third-order terms include (2fa + fb), (2fa fb), (fa + 2fb) and
(fa 2fb).
The AD7938-6 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-order and third-order terms are
specified separately. The intermodulation distortion is
calculated per the THD specification, as the ratio of the rms
sum of the individual distortion products to the rms amplitude
of the sum of the fundamentals, expressed in dB.
相關PDF資料 |
PDF描述 |
|---|---|
| LTC2355CMSE-12#TRPBF | IC ADC 12BIT 3.5MSPS 10-MSOP |
| LTC2356CMSE-12#TRPBF | IC ADC 12BIT 3.5MSPS 10-MSOP |
| AD7887BR-REEL7 | IC ADC 12BIT 2CH SRL 8-SOIC |
| MS27497T18A32P | CONN RCPT 32POS WALL MNT W/PINS |
| AD7887BR-REEL | IC ADC 12BIT 2CH SRL 8-SOIC |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| AD7938BCPZ-REEL7 | 功能描述:IC ADC 12BIT 8CH 1.5MSPS 32LFCSP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉換器 系列:- 標準包裝: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） 供應商設備封裝:24-SOIC 包裝:帶卷 (TR) 輸入數(shù)目和類型:1 個單端，單極；1 個單端，雙極 |
| AD7938BSU | 制造商:Analog Devices 功能描述: |
| AD7938BSU-6 | 制造商:Analog Devices 功能描述:ADC Single SAR 625ksps 12-bit Parallel 32-Pin TQFP |
| AD7938BSU-6REEL | 制造商:AD 制造商全稱:Analog Devices 功能描述:8-Channel, 625 kSPS, 12-Bit Parallel ADCs with a Sequencer |
| AD7938BSU-6REEL7 | 制造商:Analog Devices 功能描述:ADC Single SAR 625ksps 12-bit Parallel 32-Pin TQFP T/R |
發(fā)布緊急采購，3分鐘左右您將得到回復。