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參數資料
| 型號： | AD7997 |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | 串行ADC |
| 英文描述： | 8-Channel, 10- and 12-Bit ADCs with I2CCompatible |
| 中文描述： | 8通道，10 -和12位ADC與I2CCompatible |
| 文件頁數： | 11/32頁 |
| 文件大小： | 1056K |
| 代理商： | AD7997 |
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AD7997/AD7998
TERMINOLOGY
Signal-to-Noise and Distortion Ratio (SINAD)
The measured ratio of signal-to-noise and distortion at the out-
put of the A/D converter. 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 is
dependent on the number of quantization levels in the digiti-
zation process; the more levels, the smaller the quantization
noise. The theoretical signal-to-noise and 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
Rev. 0 | Page 11 of 32
Thus, the SINAD is 61.96 dB for a 10-bit converter and 74 dB
for a 12-bit converter.
Total Harmonic Distortion (THD)
The ratio of the rms sum of harmonics to the fundamental. For
the AD7997/AD7998, it is defined as
1
6
5
4
3
2
V
V
V
V
V
V
THD
2
2
2
2
2
log
20
)
dB
(
+
+
+
+
=
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
sixth harmonics.
Peak Harmonic or Spurious Noise
The ratio of the rms value of the next largest component in the
ADC output spectrum (up to f
S
/2 and excluding dc) to the rms
value of the fundamental. Typically, 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 equal zero. For example,
second-order terms include (fa + fb) and (fa
fb), while
third-order terms include (2fa + fb), (2fa
fb),(fa + 2fb) and
(fa
2fb).
The AD7997/AD7998 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 dis-
tanced 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 intermodulation distor-
tion is, like the THD specification, the ratio of the rms sum of
the individual distortion products to the rms amplitude of the
sum of the fundamentals, expressed in dB.
Channel-to-Channel Isolation
A measure of the level of crosstalk between channels, taken
by applying a full-scale sine wave signal to the unselected input
channels, and determining how much the 108 Hz signal is
attenuated in the selected channel. The sine wave signal applied
to the unselected channels is then varied from 1 kHz up to
2 MHz, each time determining how much the 108 Hz signal in
the selected channel is attenuated. This figure represents the
worst-case level across all channels.
Aperture Delay
The measured interval between the sampling clock’s leading
edge and the point at which the ADC takes the sample.
Aperture Jitter
This is the sample-to-sample variation in the effective point in
time at which the sample is taken.
Full-Power Bandwidth
The input frequency at which the amplitude of the reconstructed
fundamental is reduced by 0.1 dB or 3 dB for a full-scale input.
Power Supply Rejection Ratio (PSRR)
The ratio of the power in the ADC output at the full-scale
frequency,
f
, to the power of a 200 mV p-p sine wave applied
to the ADC V
DD
supply of frequency
f
S
:
PSRR
(dB) = 10 log (
Pf
/
Pf
S
)
where
Pf
is the power at frequency
f
in the ADC output;
Pf
S
is
the power at frequency
f
S
coupled onto the ADC V
DD
supply.
Integral Nonlinearity
The maximum deviation from a straight line passing through
the endpoints of the ADC transfer function. The endpoints are
zero scale, a point 1 LSB below the first code transition, and full
scale, a point 1 LSB above the last code transition.
Differential Nonlinearity
The difference between the measured and the ideal 1 LSB
change between any two adjacent codes in the ADC.
Offset Error
The deviation of the first code transition (00…000) to
(00…001) from the ideal—that is, AGND + 1 LSB.
Offset Error Match
The difference in offset error between any two channels.
Gain Error
The deviation of the last code transition (111…110) to
(111…111) from the ideal (that is, REF
IN
1 LSB) after the
offset error has been adjusted out.
Gain Error Match
The difference in gain error between any two channels.
相關PDF資料 |
PDF描述 |
|---|---|
| AD7997BRU-0 | 8-Channel, 10- and 12-Bit ADCs with I2CCompatible |
| AD7997BRU-0REEL | 8-Channel, 10- and 12-Bit ADCs with I2CCompatible |
| AD7997BRU-1 | 8-Channel, 10- and 12-Bit ADCs with I2CCompatible |
| AD7997BRU-1REEL | 8-Channel, 10- and 12-Bit ADCs with I2CCompatible |
| AD7997BRUZ-03 | 8-Channel, 10- and 12-Bit ADCs with I2CCompatible |
相關代理商/技術參數 |
參數描述 |
|---|---|
| AD7997BRU-0 | 功能描述:IC ADC 10BIT 8CHAN I2C 20TSSOP RoHS:否 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1,000 系列:- 位數:16 采樣率（每秒）:45k 數據接口:串行 轉換器數目:2 功率耗散（最大）:315mW 電壓電源:模擬和數字 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:28-SOIC W 包裝:帶卷 (TR) 輸入數目和類型:2 個單端，單極 |
| AD7997BRU-0REEL | 功能描述:IC ADC 10BIT 8CHAN I2C 20TSSOP RoHS:否 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:2,500 系列:- 位數:16 采樣率（每秒）:15 數據接口:MICROWIRE?，串行，SPI? 轉換器數目:1 功率耗散（最大）:480µW 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:38-WFQFN 裸露焊盤 供應商設備封裝:38-QFN（5x7） 包裝:帶卷 (TR) 輸入數目和類型:16 個單端，雙極；8 個差分，雙極 配用:DC1011A-C-ND - BOARD DELTA SIGMA ADC LTC2494 |
| AD7997BRU-1 | 制造商:Analog Devices 功能描述:ADC Single SAR 188ksps 10-bit Serial 20-Pin TSSOP 制造商:Rochester Electronics LLC 功能描述:8-CHANNEL, 10-BIT ADC WITH 12C ITF I.C. - Bulk |
| AD7997BRU-1REEL | 制造商:Analog Devices 功能描述:ADC Single SAR 188ksps 10-bit Serial 20-Pin TSSOP T/R 制造商:Analog Devices 功能描述:ADC SGL SAR 188KSPS 10-BIT SERL 20SSOP - Tape and Reel |
| AD7997BRU-O | 制造商:Analog Devices 功能描述: |
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