参数资料
| 型号： | LTC2242IUP-10#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/30页 |
| 文件大小： | 0K |
| 描述： | IC ADC 10BIT 250MSPS 64-QFN |
| 标准包装： | 40 |
| 位数： | 10 |
| 采样率（每秒）： | 250M |
| 数据接口： | 并联 |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 975mW |
| 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： | 64-WFQFN 裸露焊盘 |
| 供应商设备封装： | 64-QFN（9x9） |
| 包装： | 管件 |
| 输入数目和类型： | 1 个差分，双极 |
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LTC2242-10
18
224210fd
applicaTions inForMaTion
Other voltage ranges in between the pin selectable ranges
can be programmed with two external resistors as shown
in Figure 10. An external reference can be used by ap-
plying its output directly or through a resistor divider to
SENSE. It is not recommended to drive the SENSE pin
with a logic device. The SENSE pin should be tied to the
appropriate level as close to the converter as possible. If
the SENSE pin is driven externally, it should be bypassed
to ground as close to the device as possible with a 1F
ceramic capacitor.
Input Range
The input range can be set based on the application.
The 2V input range will provide the best signal-to-noise
performance while maintaining excellent SFDR. The 1V
input range will have better SFDR performance, but the
SNR will degrade by 1.7dB. See the Typical Performance
Characteristics section.
Driving the Encode Inputs
The noise performance of the LTC2242-10 can depend
on the encode signal quality as much as on the analog
input. The ENC+/ENC– inputs are intended to be driven
differentially, primarily for noise immunity from common
mode noise sources. Each input is biased through a 4.8k
resistor to a 1.5V bias. The bias resistors set the DC op-
erating point for transformer coupled drive circuits and
can set the logic threshold for single-ended drive circuits.
Any noise present on the encode signal will result in ad-
ditional aperture jitter that will be RMS summed with the
inherent ADC aperture jitter.
In applications where jitter is critical (high input frequen-
cies) take the following into consideration:
1. Differential drive should be used.
2. Use as large an amplitude as possible; if transformer
coupled use a higher turns ratio to increase the amplitude.
3. If the ADC is clocked with a sinusoidal signal, filter the
encode signal to reduce wideband noise.
4. Balance the capacitance and series resistance at both
encode inputs so that any coupled noise will appear at
both inputs as common mode noise. The encode inputs
have a common mode range of 1.2V to 2.0V. Each input
may be driven from ground to VDD for single-ended drive.
Figure 9. Equivalent Reference Circuit
Figure 10. 1.5V Range ADC
VCM
REFHA
REFLB
SENSE
TIE TO VDD FOR 2V RANGE;
TIE TO VCM FOR 1V RANGE;
RANGE = 2 VSENSE FOR
0.5V < VSENSE < 1V
1.25V
REFLA
REFHB
2.2μF
INTERNAL ADC
HIGH REFERENCE
BUFFER
0.1μF
224210 F09
LTC2242-10
2Ω
DIFF AMP
1μF
0.1μF
INTERNAL ADC
LOW REFERENCE
1.25V BANDGAP
REFERENCE
1V
0.5V
RANGE
DETECT
AND
CONTROL
VCM
SENSE
1.25V
2.2μF
8k
12k
0.75V
1μF
224210 F10
LTC2242-10
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC2242IUP-10-TR | 制造商:LINER 制造商全称:Linear Technology 功能描述:10-Bit, 250Msps ADC |
| LTC2242IUP-10-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:10-Bit, 250Msps ADC |
| LTC2242IUP-12 | 制造商:Linear Technology 功能描述:ADC Single Pipelined 250Msps 12-bit Parallel/LVDS 64-Pin QFN EP 制造商:Linear Technology 功能描述:MS-ADC/High Speed, 12-bit, 250Msps ADC |
| LTC2242IUP-12#PBF | 制造商:Linear Technology 功能描述:ADC Single Pipelined 250Msps 12-bit Parallel/LVDS 64-Pin QFN EP 制造商:Linear Technology 功能描述:Single ADC Pipelined 250Msps 12-bit Parallel/LVDS 64-Pin QFN EP 制造商:Linear Technology 功能描述:IC ADC 12BIT 250MSPS 64-QFN 制造商:Linear Technology 功能描述:A/D Converter (A-D) IC 制造商:Linear Technology 功能描述:IC, ADC, 12BIT, 250MSPS, QFN-64, Resolution (Bits):12bit, Sampling Rate:250MSPS, Supply Voltage Type:Single, Supply Voltage Min:2.375V, Supply Voltage Max:2.625V, Supply Current:285mA, Digital IC Case Style:QFN, No. of Pins:64 , RoHS Compliant: Yes 制造商:Linear Technology 功能描述:MS-ADC/High Speed, 12-bit, 250Msps ADC |
| LTC2242IUP-12#TRPBF | 制造商:Linear Technology 功能描述:ADC Single Pipelined 250Msps 12-bit Parallel/LVDS 64-Pin QFN EP T/R 制造商:Linear Technology 功能描述:IC ADC 12BIT 250MSPS 64-QFN |
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