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参数资料
| 型号： | LTC2247CUH#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 9/24页 |
| 文件大小： | 0K |
| 描述： | IC ADC 14BIT 40MSPS SAMPL 32-QFN |
| 标准包装： | 73 |
| 位数： | 14 |
| 采样率（每秒）： | 40M |
| 数据接口： | 并联 |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 144mW |
| 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： | 32-WFQFN 裸露焊盘 |
| 供应商设备封装： | 32-QFN 裸露焊盘（5x5） |
| 包装： | 管件 |
| 输入数目和类型： | 1 个单端，双极; 1 个差分，双极 |
LTC2248/LTC2247/LTC2246
17
224876fa
APPLICATIO S I FOR ATIO
WU
UU
pins are needed to reduce package inductance. Bypass
capacitors must be connected as shown in Figure 9.
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 applying
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 1
F 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 perfor-
mance while maintaining excellent SFDR. The 1V input
range will have better SFDR performance, but the SNR will
degrade by 5.8dB. See the Typical Performance Charac-
teristics section.
Driving the Clock Input
The CLK input can be driven directly with a CMOS or TTL
level signal. A sinusoidal clock can also be used along with
Figure 10. 1.5V Range ADC
CLK
50
0.1
F
0.1
F
4.7
F
1k
FERRITE
BEAD
CLEAN
SUPPLY
SINUSOIDAL
CLOCK
INPUT
224876 F11
NC7SVU04
LTC2248/47/46
Figure 11. Sinusoidal Single-Ended CLK Drive
a low-jitter squaring circuit before the CLK pin (see
Figure 11).
The noise performance of the LTC2248/LTC2247/LTC2246
can depend on the clock signal quality as much as on the
analog input. Any noise present on the clock signal will
result in additional aperture jitter that will be RMS summed
with the inherent ADC aperture jitter.
In applications where jitter is critical, such as when digitiz-
ing high input frequencies, use as large an amplitude as
possible. Also, if the ADC is clocked with a sinusoidal
signal, filter the CLK signal to reduce wideband noise and
distortion products generated by the source.
Figures 12 and 13 show alternatives for converting a
differential clock to the single-ended CLK input. The use of
a transformer provides no incremental contribution to
phase noise. The LVDS or PECL to CMOS translators
provide little degradation below 70MHz, but at 140MHz
will degrade the SNR compared to the transformer solu-
tion. The nature of the received signals also has a large
VCM
SENSE
1.5V
0.75V
2.2
F
12k
1
F
12k
224876 F10
LTC2248/47/46
Figure 12. CLK Drive Using an LVDS or PECL to CMOS Converter
CLK
100
0.1
F
4.7
F
FERRITE
BEAD
CLEAN
SUPPLY
IF LVDS USE FIN1002 OR FIN1018.
FOR PECL, USE AZ1000ELT21 OR SIMILAR
224876 F12
LTC2248/
LTC2247/
LTC2246
CLK
5pF-30pF
ETC1-1T
0.1
F
VCM
FERRITE
BEAD
DIFFERENTIAL
CLOCK
INPUT
224876 F13
LTC2248/
LTC2247/
LTC2246
Figure 13. LVDS or PECL CLK Drive Using a Transformer
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| LTC2247IUH | 制造商:Linear Technology 功能描述:ADC Single Pipelined 40Msps 14-bit Parallel 32-Pin QFN EP |
| LTC2247IUH#PBF | 功能描述:IC ADC 14BIT 40MSPS SAMPL 32-QFN 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 系列:microPOWER™ 位数:8 采样率（每秒）:1M 数据接口:串行，SPI? 转换器数目:1 功率耗散（最大）:- 电压电源:模拟和数字 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:24-VFQFN 裸露焊盘 供应商设备封装:24-VQFN 裸露焊盘（4x4） 包装:Digi-Reel® 输入数目和类型:8 个单端，单极 产品目录页面:892 (CN2011-ZH PDF) 其它名称:296-25851-6 |
| LTC2247IUH#TR | 制造商:Linear Technology 功能描述:ADC Single Pipelined 40Msps 14-bit Parallel 32-Pin QFN EP T/R |
| LTC2247IUH#TRPBF | 功能描述:IC ADC 14BIT 40MSPS SAMPL 32-QFN 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 系列:- 位数:14 采样率（每秒）:83k 数据接口:串行，并联 转换器数目:1 功率耗散（最大）:95mW 电压电源:双 ± 工作温度:0°C ~ 70°C 安装类型:通孔 封装/外壳:28-DIP（0.600"，15.24mm） 供应商设备封装:28-PDIP 包装:管件 输入数目和类型:1 个单端，双极 |
| LTC2248 | 制造商:LINER 制造商全称:Linear Technology 功能描述:14-Bit, 80Msps Low Power 3V ADC |
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