参数资料
| 型号： | LTC1740IG#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 16/16页 |
| 文件大小： | 0K |
| 描述： | IC ADC 14BIT 6MSPS 36SSOP |
| 标准包装： | 2,000 |
| 位数： | 14 |
| 采样率（每秒）： | 6M |
| 数据接口： | 并联 |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 300mW |
| 电压电源： | 双 ± |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 36-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 36-SSOP |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 2 个单端，双极；1 个差分，双极 |
9
LTC1740
1740f
APPLICATIO S I FOR ATIO
WU
UU
Conversion Details
The LTC1740 is a high performance 14-bit A/D converter
that operates up to 6Msps. It is a complete solution with
an on-chip sample-and-hold, a 14-bit pipelined CMOS
ADC and a low drift programmable reference. The digital
output is parallel, with a 14-bit two’s complement format
and an out-of-range (overflow) bit.
The rising edge of the CLK begins the conversion. The
differential analog inputs are simultaneously sampled and
passed on to the pipelined A/D. After two more conversion
starts (plus a 100ns conversion time) the digital outputs
are updated with the conversion result and will be ready for
capture on the third rising clock edge. Thus even though
a new conversion is begun every time CLK goes high, each
result takes three clock cycles to reach the output.
The analog signals that are passed from stage to stage in
the pipelined A/D are stored on capacitors. The signals on
these capacitors will be lost if the delay between conver-
sions is too long. For accurate conversion results, the part
should be clocked faster than 50kHz.
In some pipelined A/D converters if there is no clock present,
dynamic logic on the chip will droop and the power con-
sumption sharply increases. The LTC1740 doesn’t have
this problem. If the part is not clocked for 1ms, an internal
timer will refresh the dynamic logic. Thus the clock can be
turned off for long periods of time to save power.
Power Supplies
The LTC1740 will operate from either a single 5V or dual
±5V supply, making it easy to interface the analog input to
single or dual supply systems. The digital output drivers
have their own power supply pin (OVDD) which can be set
from 3V to 5V, allowing direct connection to either 3V or
5V digital systems. For single supply operation, VSS should
be connected to analog ground. For dual supply operation,
VSS should be connected to – 5V. All VDD pins should be
connected to a clean 5V analog supply. (Don’t connect VDD
to a noisy system digital supply.)
Analog Input Range
The LTC1740 has a flexible analog input with a wide
selection of input ranges. The input range is always
differential and is set by the voltage at the VREF pin
(Figure 1). The input range of the A/D core is fixed at
±VREF/1.8. The reference voltage, VREF, is either set by the
on-chip voltage reference or directly driven by an external
voltage.
Internal Reference
Figure 2 shows a simplified schematic of the LTC1740
reference circuitry. An on-chip temperature compensated
bandgap reference (VCM) is factory trimmed to 2.500V.
The voltage at the VREF pin sets the input span of the ADC
to
±VREF/1.8. An internal voltage divider converts VCM to
2.250V, which is connected to a reference amplifier. The
reference programming pin, SENSE, controls how the
VREF
–AIN
+AIN
1740 F01
VIN
+
–
±VREF
1.8
ADC
CORE
Figure 1. Analog Input Circuit
VCM
SENSE
VREF
1740 F02
–
+
R1
5k
LOGIC
2.5V
REFERENCE
2.250V
1
F
1
F
1k
TO
ADC
R2
5k
Figure 2. Reference Circuit
相关PDF资料 |
PDF描述 |
|---|---|
| LTC1741IFW#PBF | IC ADC 12BIT 65MSPS 48-TSSOP |
| LTC1742CFW#TRPBF | IC ADC 14BIT 65MSPS 48-TSSOP |
| LTC1743IFW#PBF | IC ADC 12BIT 50MSPS SMPL 48TSSOP |
| LTC1744IFW#TRPBF | IC ADC 14BIT 50MSPS 48-TSSOP |
| LTC1745CFW#TRPBF | IC ADC 12BIT 25MSPS LN 48TSSOP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC1741CFW | 功能描述:IC ADC 12BIT 65MSPS 48-TSSOP RoHS:否 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 其它有关文件:TSA1204 View All Specifications 标准包装:1 系列:- 位数:12 采样率（每秒）:20M 数据接口:并联 转换器数目:2 功率耗散（最大）:155mW 电压电源:模拟和数字 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-TQFP 供应商设备封装:48-TQFP（7x7） 包装:Digi-Reel® 输入数目和类型:4 个单端，单极；2 个差分，单极 产品目录页面:1156 (CN2011-ZH PDF) 其它名称:497-5435-6 |
| LTC1741CFW#PBF | 功能描述:IC ADC 12BIT 65MSPS 48-TSSOP 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:- |
| LTC1741CFW#TR | 功能描述:IC ADC SMPL 12BIT 65MSPS 48TSSOP 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:12 采样率（每秒）:300k 数据接口:并联 转换器数目:1 功率耗散（最大）:75mW 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:24-SOIC（0.295"，7.50mm 宽） 供应商设备封装:24-SOIC 包装:带卷 (TR) 输入数目和类型:1 个单端，单极；1 个单端，双极 |
| LTC1741CFW#TRPBF | 功能描述:IC ADC 12BIT 65MSPS 48-TSSOP 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:- |
| LTC1741IFW | 功能描述:IC ADC SMPL 12BIT 65MSPS 48TSSOP 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:12 采样率（每秒）:300k 数据接口:并联 转换器数目:1 功率耗散（最大）:75mW 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:24-SOIC（0.295"，7.50mm 宽） 供应商设备封装:24-SOIC 包装:带卷 (TR) 输入数目和类型:1 个单端，单极；1 个单端，双极 |
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