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參數(shù)資料
| 型號： | LTC1198-2BCS8 |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 14/28頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 8BIT 750KHZ SAMPL 8-SOIC |
| 標(biāo)準(zhǔn)包裝： | 100 |
| 位數(shù)： | 8 |
| 采樣率（每秒）： | 750k |
| 數(shù)據(jù)接口： | 串行 |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 50mW |
| 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： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-SOIC |
| 包裝： | 管件 |
| 輸入數(shù)目和類型： | 1 個單端，單極 |
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LTC1196/LTC1198
21
119698fb
APPLICATIONS INFORMATION
Noise with Reduced VREF
The total input referred noise of the LTC1196 can be
reduced to approximately 2mVP-P using a ground plane,
good bypassing, good layout techniques and minimizing
noise on the reference inputs. This noise is insignicant
with a 5V reference but will become a larger fraction of
an LSB as the size of the LSB is reduced.
For operation with a 5V reference, the 2mV noise is only
0.1LSB peak-to-peak. In this case, the LTC1196 noise
will contribute virtually no uncertainty to the output code.
However, for reduced references, the noise may become
a signicant fraction of an LSB and cause undesirable jit-
ter in the output code. For example, with a 1V reference,
this same 2mV noise is 0.5LSB peak-to-peak. This will
reduce the range of input voltages over which a stable
output code can be achieved by 1LSB. If the reference is
further reduced to 200mV, the 2mV noise becomes equal
to 2.5LSB and a stable code is difcult to achieve. In this
case averaging readings is necessary.
This noise data was taken in a very clean setup. Any setup
induced noise (noise or ripple on VCC, VREF or VIN) will
add to the internal noise. The lower the reference voltage
to be used, the more critical it becomes to have a clean,
noise-free setup.
DYNAMIC PERFORMANCE
The LTC1196/LTC1198 have exceptionally high speed
sampling capability. Fast Fourier Transform (FFT) test
techniques are used to characterize the ADC’s frequency
response, distortion and noise at the rated throughput. By
applying a low distortion sine wave and analyzing the digital
output using a FFT algorithm, the ADC’s spectral content
can be examined for frequencies outside the fundamental.
Figure 10 shows a typical LTC1196 FFT plot.
Signal-to-Noise Ratio
The Signal-to-Noise plus Distortion Ratio [S/(N + D)] is
the ratio between the RMS amplitude of the fundamental
input frequency to the RMS amplitude of all other frequency
components at the ADC’s output. The output is band limited
to frequencies above DC and below one half the sampling
frequency. Figure 10 shows a typical spectral content with
a 882kHz sampling rate.
Effective Number of Bits
The Effective Number of Bits (ENOBs) is a measurement
of the resolution of an ADC and is directly related to
S/(N + D) by the equation:
N = [S/(N + D) –1.76]/6.02
FREQUENCY (kHz)
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
400
1196/98 G25
100
200
300
500
VCC = 5V
fIN = 29kHz
fSMPL = 882kHz
MAGNITUDE
(dB)
Figure 10. LTC1196 Nonaveraged, 4096 Point FFT Plot
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| LTC1198-2BCS8#PBF | 功能描述:IC ADC 8BIT 750KHZ SAMPL 8-SOIC 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 個單端，單極；2 個差分，單極 產(chǎn)品目錄頁面:1156 (CN2011-ZH PDF) 其它名稱:497-5435-6 |
| LTC1198-2BCS8#TR | 功能描述:IC ADC 8BIT 750KHZ SHUTDWN 8SOIC RoHS:否 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:2,500 系列:- 位數(shù):16 采樣率（每秒）:15 數(shù)據(jù)接口:MICROWIRE?，串行，SPI? 轉(zhuǎn)換器數(shù)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(yīng)商設(shè)備封裝:38-QFN（5x7） 包裝:帶卷 (TR) 輸入數(shù)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 |
| LTC1198-2BCS8#TRPBF | 功能描述:IC ADC 8BIT 750KHZ SAMPL 8-SOIC 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:2,500 系列:- 位數(shù):16 采樣率（每秒）:15 數(shù)據(jù)接口:MICROWIRE?，串行，SPI? 轉(zhuǎn)換器數(shù)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(yīng)商設(shè)備封裝:38-QFN（5x7） 包裝:帶卷 (TR) 輸入數(shù)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 |
| LTC1198-2BCS8-PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:8-Bit, SO-8, 1Msps ADCs with Auto-Shutdown Options |
| LTC1198-2BCS8-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:8-Bit, SO-8, 1Msps ADCs with Auto-Shutdown Options |
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