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| 型号： | LTC1198-2ACS8 |
| 厂商： | Linear Technology |
| 文件页数： | 15/28页 |
| 文件大小： | 0K |
| 描述： | IC ADC 8BIT 750KHZ SAMPL 8-SOIC |
| 标准包装： | 100 |
| 位数： | 8 |
| 采样率（每秒）： | 750k |
| 数据接口： | 串行 |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 50mW |
| 电压电源： | 单电源 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 管件 |
| 输入数目和类型： | 1 个单端，单极 |
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LTC1196/LTC1198
22
119698fb
APPLICATIONS INFORMATION
where N is the effective number of bits of resolution and
S/(N + D) is expressed in dB. At the maximum sampling
rate of 1.2MHz with a 5V supply the LTC1196 maintains
above 7.5 ENOBs at 400kHz input frequency. Above 500kHz
the ENOBs gradually decline, as shown in Figure 11, due
to increasing second harmonic distortion. The noise oor
remains low.
Figure 11. Effective Bits and S/(N + D) vs Input Frequency
Total Harmonic Distortion
Total Harmonic Distortion (THD) is the ratio of the RMS
sum of all harmonics of the input signal to the fundamental
itself. The out-of-band harmonics alias into the frequency
band between DC and half of the sampling frequency. THD
is dened as:
THD
=
+++ +
20log
VVV
V
2
3
2
4
2
N
2
1
...
where V1 is the RMS amplitude of the fundamental fre-
quency and V2 through VN are the amplitudes of the second
through the Nth harmonics. The typical THD specication
in the Dynamic Accuracy table (see the Electrical Charac-
teristics section) includes the 2nd through 5th harmonics.
With a 100kHz input signal, the LTC1196/LTC1198 have
typical THD of 50dB and 49dB with VCC = 5V and VCC =
3V, respectively.
Intermodulation Distortion
If the ADC input signal consists of more than one spectral
component, the ADC transfer function nonlinearity can
produce intermodulation distortion (IMD) in addition to
THD. IMD is the change in one sinusoidal input caused
by the presence of another sinusoidal input at a different
frequency.
If two pure sine waves of frequencies fa and fb are applied
to the ADC input, nonlinearities in the ADC transfer func-
tion can create distortion products at sum and difference
frequencies of mfa ± nfb, where m and n = 0, 1, 2, 3, etc.
For example, the 2nd order IMD terms include (fa + fb)
and (fa – fb) while 3rd order IMD terms include (2fa + fb),
(2fa – fb), (fa + 2fb) and (fa – 2fb). If the two input sine
waves are equal in magnitudes, the value (in dB) of the
2nd order IMD products can be expressed by the follow-
ing formula:
IMD f
f
mplitude f
f
ab
±
()=
±
()
20log
a
amplitudeattfa
For input frequencies of 499kHz and 502kHz, the IMD of
the LTC1196/LTC1198 is 51dB with a 5V supply.
Peak Harmonic or Spurious Noise
The peak harmonic or spurious noise is the largest spec-
tral component excluding the input signal and DC. This
value is expressed in dBs relative to the RMS value of a
full-scale input signal.
Full-Power and Full-Linear Bandwidth
The full-power bandwidth is that input frequency at which
the amplitude of the reconstructed fundamental is reduced
by 3dB for a full-scale input.
The full-linear bandwidth is the input frequency at which
the effective bits rating of the ADC falls to 7 bits. Beyond
this frequency, distortion of the sampled input signal
increases. The LTC1196/LTC1198 have been designed to
optimize input bandwidth, allowing the ADCs to unders-
ample input signals with frequencies above the converters’
Nyquist frequency.
INPUT FREQUENCY (Hz)
1k
S/(N
+
D)
(dB)
8
7
6
5
4
3
2
1
0
10k
100k
1M
11968 F11
50
44
EFFECTIVE
NUMBER
OF
BITS
(ENOBs)
VREF =VCC = 2.7V
fSMPL = 383kHz (LTC1196)
fSMPL = 287kHz (LTC1198)
VREF =VCC = 5V
fSMPL = 1MHz (LTC1196)
fSMPL = 750kHz (LTC1198)
TA = 25°C
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| LTC1198-2ACS8#PBF | 功能描述:IC ADC 8BIT 750KHZ SAMPL 8-SOIC RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 位数:12 采样率（每秒）:3M 数据接口:- 转换器数目:- 功率耗散（最大）:- 电压电源:- 工作温度:- 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-23-6 包装:带卷 (TR) 输入数目和类型:- |
| LTC1198-2ACS8#TR | 功能描述:IC ADC 8BIT 750KHZ SHUTDWN 8SOIC RoHS:否 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:2,500 系列:- 位数:16 采样率（每秒）:15 数据接口:MICROWIRE?，串行，SPI? 转换器数目:1 功率耗散（最大）:480µW 电压电源:单电源 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:38-WFQFN 裸露焊盘 供应商设备封装:38-QFN（5x7） 包装:带卷 (TR) 输入数目和类型:16 个单端，双极；8 个差分，双极 配用:DC1011A-C-ND - BOARD DELTA SIGMA ADC LTC2494 |
| LTC1198-2ACS8#TRPBF | 功能描述:IC ADC 8BIT 750KHZ SAMPL 8-SOIC RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 位数:12 采样率（每秒）:3M 数据接口:- 转换器数目:- 功率耗散（最大）:- 电压电源:- 工作温度:- 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-23-6 包装:带卷 (TR) 输入数目和类型:- |
| LTC1198-2ACS8-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:8-Bit, SO-8, 1Msps ADCs with Auto-Shutdown Options |
| LTC1198-2ACS8-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:8-Bit, SO-8, 1Msps ADCs with Auto-Shutdown Options |
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