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參數(shù)資料
| 型號(hào)： | AD7899BR-1 |
| 廠商： | Analog Devices Inc |
| 文件頁(yè)數(shù)： | 14/16頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 14BIT 400KSPS 5V 28-SOIC |
| 標(biāo)準(zhǔn)包裝： | 27 |
| 位數(shù)： | 14 |
| 采樣率（每秒）： | 400k |
| 數(shù)據(jù)接口： | 并聯(lián) |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 125mW |
| 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： | 28-SOIC（0.295"，7.50mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 28-SOIC W |
| 包裝： | 管件 |
| 輸入數(shù)目和類型： | 1 個(gè)差分，雙極 |
| 配用： | EVAL-AD7899CBZ-ND - BOARD EVAL FOR AD7899 |
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REV. A
AD7899
–7–
TERMINOLOGY
Signal to (Noise + Distortion) Ratio
This is the measured ratio of signal to (noise + distortion) at the
output of the A/D converter. The signal is the rms amplitude of
the fundamental. Noise is the rms sum of all nonfundamental
signals up to half the sampling frequency (fS/2), excluding dc.
The ratio is dependent upon the number of quantization levels
in the digitization process; the more levels, the smaller the quan-
tization 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) = (6.02N + 1.76) dB
Thus for a 14-bit converter, this is 86.04 dB.
Total Harmonic Distortion
Total harmonic distortion (THD) is the ratio of the rms sum of
harmonics to the fundamental. For the AD7899 it is defined
as: THD dB
VVV
V
(
)
log
=
++
+
20
2
3
2
4
2
5
2
6
2
1
where V1 is the rms amplitude of the fundamental and V2, V3,
V4, and V5 are the rms amplitudes of the second through the
fifth 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 fS/2 and excluding dc) to the rms value of the
fundamental. Normally, the value of this specification is deter-
mined by the largest harmonic in the spectrum, but for parts
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, etc. Intermodulation 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 AD7899 is tested using two input frequencies. In this case, the
second and third order terms are of different significance. 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 speci-
fication where it is the ratio of the rms sum of the individual
distortion products to the rms amplitude of the fundamental
expressed in dBs.
Differential Nonlinearity
This is the difference between the measured and the ideal
1 LSB change between any two adjacent codes in the ADC.
Positive Gain Error (AD7899-1, AD7899-3)
This is the deviation of the last code transition (01 . . . 110 to
01 . . . 111) from the ideal 4
× VREF – 3/2 LSB (AD7899 at
± 10 V), 2 × V
REF – 3/2 LSB (AD7899 at
± 5 V range) or V
REF
– 3/2 LSB (AD7899 at
± 2.5 V range) after the Bipolar Offset
Error has been adjusted out.
Positive Gain Error (AD7899-2)
This is the deviation of the last code transition (11 . . . 110 to
11 . . . 111) from the ideal 2
× VREF – 3/2 LSB (AD7899 at
± 10 V), 2 × VREF – 3/2 LSB (AD7899 at 0 V to 5 V range) or
VREF – 3/2 LSB (AD7899 at 0 V to 2.5 V range) after the Uni-
polar Offset Error has been adjusted out.
Unipolar Offset Error (AD7899-2)
This is the deviation of the first code transition (00 . . . 00 to
00 . . . 01) from the ideal AGND +1/2 LSB
Bipolar Zero Error (AD7899-1, AD7899-2)
This is the deviation of the midscale transition (all 0s to all 1s)
from the ideal AGND – 1/2 LSB.
Negative Gain Error (AD7899-1, AD7899-3)
This is the deviation of the first code transition (10 . . . 000 to
10 . . . 001) from the ideal –4
× VREF + 1/2 LSB (AD7899 at
±10 V), –2 × VREF + 1/2 LSB (AD7899 at ±5 V range) or –VREF
+ 1/2 LSB (AD7899 at
±2.5 V range) after Bipolar Zero Error
has been adjusted out.
Track/Hold Acquisition Time
Track/Hold acquisition time is the time required for the output
of the track/hold amplifier to reach its final value, within
±1/2 LSB,
after the end of conversion (the point at which the track/hold
returns to track mode). It also applies to situations where there
is a step input change on the input voltage applied to the selected
VINA/VINB input of the AD7899. It means that the user must wait
for the duration of the track/hold acquisition time after the end
of conversion or after a step input change to VINA/VINB before
starting another conversion, to ensure that the part operates to
specification.
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參數(shù)描述 |
|---|---|
| AD7899BR-1REEL | 制造商:Analog Devices 功能描述:ADC SGL SAR 400KSPS 14BIT PARALLEL 28SOIC W - Tape and Reel |
| AD7899BR-1REEL7 | 功能描述:IC ADC 14BIT 400KSPS 5V 28-SOIC RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 位數(shù):12 采樣率（每秒）:3M 數(shù)據(jù)接口:- 轉(zhuǎn)換器數(shù)目:- 功率耗散（最大）:- 電壓電源:- 工作溫度:- 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應(yīng)商設(shè)備封裝:SOT-23-6 包裝:帶卷 (TR) 輸入數(shù)目和類型:- |
| AD7899BR-3 | 制造商:Rochester Electronics LLC 功能描述:14-BIT BIPOLAR INPUT SINGLE SUPPLY ADC - Bulk 制造商:Analog Devices 功能描述: |
| AD7899BR-3REEL | 制造商:Analog Devices 功能描述:ADC SGL SAR 400KSPS 14BIT PARALLEL 28SOIC W - Tape and Reel |
| AD7899BR-3REEL7 | 制造商:Analog Devices 功能描述: 制造商:Rochester Electronics LLC 功能描述: |
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