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参数资料
| 型号： | LTC1852CFW#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 4/24页 |
| 文件大小： | 0K |
| 描述： | IC A/D CONV 8CH 10BIT 48-TSSOP |
| 标准包装： | 1,800 |
| 位数： | 10 |
| 采样率（每秒）： | 400k |
| 数据接口： | 并联 |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 15mW |
| 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： | 48-TFSOP（0.240"，6.10mm 宽） |
| 供应商设备封装： | 48-TSSOP |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 8 个单端，单极；8 个单端，双极；4 个差分，单极；4 个差分，双极 |
LTC1852/LTC1853
12
18523fa
The LTC1852/LTC1853 have a unique differential sample-
and-hold circuit that allows rail-to-rail inputs. The ADC will
always convert the difference of the “+” and “–” inputs
independent of the common mode voltage. The common
mode rejection holds up to high frequencies. The only
requirement is that both inputs can not exceed the AVDD
power supply voltage or ground. When a bipolar input
span is selected the “+” input can swing ± full scale rela-
tive to the “–” input but neither input can exceed AVDD or
go below ground.
Integral nonlinearity errors (INL) and differential nonlin-
earity errors (DNL) are independent of the common mode
voltage, however, the bipolar offset will vary. The change
in bipolar offset is typically less than 0.1% of the common
mode voltage.
Some AC applications may have their performance limited
by distortion. Most circuits exhibit higher distortion when
signals approach the supply or ground. THD will degrade
as the inputs approach either power supply rail. Distor-
tion can be reduced by reducing the signal amplitude
and keeping the common mode voltage at approximately
midsupply.
Driving the Analog Inputs
The inputs of the LTC1852/LTC1853 are easy to drive. Each
of the analog inputs can be used as a single-ended input
relative to the input common pin (CH0-COM, CH1-COM,
etc.) or in pairs (CH0 and CH1, CH2 and CH3, CH4 and
CH5, CH6 and CH7) for differential inputs. Regardless
of the MUX conguration, the “+” and “–” inputs are
sampled at the same instant. Any unwanted signal that is
common mode to both inputs will be reduced by the com-
mon mode rejection of the sample-and-hold circuit. The
inputs draw only one small current spike while charging
the sample-and-hold capacitors at the end of conversion.
During conversion, the analog inputs draw only a small
leakage current. If the source impedance of the driving
circuit is low, then the LTC1852/LTC1853 inputs can be
driven directly. As source impedance increases, so will
acquisition time. For minimum acquisition time with high
source impedance, a buffer amplier should be used. The
only requirement is that the amplier driving the analog
input(s) must settle after the small current spike before
the next conversion starts (settling time must be less than
150ns for full throughput rate).
Choosing an Input Amplier
Choosing an input amplier is easy if a few requirements
are taken into consideration. First, to limit the magnitude
of the voltage spike seen by the amplier from charging
the sampling capacitor, choose an amplier that has a low
output impedance (<100Ω) at the closed-loop bandwidth
frequency. For example, if an amplier is used in a gain
of +1 and has a unity-gain bandwidth of 50MHz, then the
output impedance at 50MHz should be less than 100Ω.
The second requirement is that the closed-loop bandwidth
must be greater than 10MHz to ensure adequate small-
signal settling for full throughput rate. The following list
is a summary of the op amps that are suitable for driving
the LTC1852/LTC1853, more detailed information is avail-
able in the Linear Technology Databooks, the LinearView
CD-ROM and on our web site at www.linear-tech.com.
LT1360:
50MHz Voltage Feedback Amplier. ± 2.5V to
±15V supplies. 5mA supply current. Low distortion.
LT1363: 70MHz Voltage Feedback Amplier. ± 2.5V to ±15V
supplies. 7.5mA supply current. Low distortion.
LT1364/LT1365: Dual and Quad 70MHz Voltage Feedback
Ampliers. ±2.5V to ±15V supplies. 7.5mA supply current
per amplier. Low distortion.
LT1468/LT1469: Single and Dual 90MHz Voltage Feedback
Amplier. ± 5V to ±15V supplies. 7mA supply current per
amplier. Lowest noise and low distortion.
LT1630/LT1631: Dual and Quad 30MHz Rail-to-Rail Volt-
age Feedback Ampliers. Single 3V to ±15V supplies.
3.5mA supply current per amplier. Low noise and low
distortion.
LT1632/LT1633: Dual and Quad 45MHz Rail-to-Rail Voltage
Feedback Ampliers. Single 3V to ±15V supplies. 4.3mA
supply current per amplier. Low distortion.
LT1806/LT1807: Single and Dual 325MHz Rail-to-Rail
Voltage Feedback Amplier. Single 3V to ± 5V supplies.
13mA supply current. Lowest distortion.
LinearView is a trademark of Linear Technology Corporation.
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| LTC1852IFW | 功能描述:IC A/D CONV 8CH 10BIT 48-TSSOP RoHS:否 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1,000 系列:- 位数:16 采样率（每秒）:45k 数据接口:串行 转换器数目:2 功率耗散（最大）:315mW 电压电源:模拟和数字 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC W 包装:带卷 (TR) 输入数目和类型:2 个单端，单极 |
| LTC1852IFW#PBF | 功能描述:IC A/D CONV 8CH 10BIT 48-TSSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1,000 系列:- 位数:16 采样率（每秒）:45k 数据接口:串行 转换器数目:2 功率耗散（最大）:315mW 电压电源:模拟和数字 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC W 包装:带卷 (TR) 输入数目和类型:2 个单端，单极 |
| LTC1852IFW#TR | 功能描述:IC A/D CONV 8CH 10BIT 48-TSSOP RoHS:否 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1,000 系列:- 位数:16 采样率（每秒）:45k 数据接口:串行 转换器数目:2 功率耗散（最大）:315mW 电压电源:模拟和数字 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC W 包装:带卷 (TR) 输入数目和类型:2 个单端，单极 |
| LTC1852IFW#TRPBF | 功能描述:IC A/D CONV 8CH 10BIT 48-TSSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1,000 系列:- 位数:16 采样率（每秒）:45k 数据接口:串行 转换器数目:2 功率耗散（最大）:315mW 电压电源:模拟和数字 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC W 包装:带卷 (TR) 输入数目和类型:2 个单端，单极 |
| LTC1853CFW | 功能描述:IC A/D CONV 8CH 12BIT 48-TSSOP RoHS:否 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1,000 系列:- 位数:16 采样率（每秒）:45k 数据接口:串行 转换器数目:2 功率耗散（最大）:315mW 电压电源:模拟和数字 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC W 包装:带卷 (TR) 输入数目和类型:2 个单端，单极 |
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