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參數(shù)資料
| 型號(hào)： | LTC2251IUH#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 8/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 10BIT 125MSPS 3V 32-QFN |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 位數(shù)： | 10 |
| 采樣率（每秒）： | 125M |
| 數(shù)據(jù)接口： | 并聯(lián) |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 468mW |
| 電壓電源： | 單電源 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 32-WFQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 32-QFN 裸露焊盤（5x5） |
| 包裝： | 帶卷 (TR) |
| 輸入數(shù)目和類型： | 1 個(gè)單端，雙極; 1 個(gè)差分，雙極 |
LTC2251/LTC2250
16
22510fa
APPLICATIO S I FOR ATIO
WU
UU
The difference amplifier generates the high and low refer-
ence for the ADC. High speed switching circuits are
connected to these outputs and they must be externally
bypassed. Each output has two pins. The multiple output
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
Fceramiccapacitor.
VCM
SENSE
1.5V
0.75V
2.2
F
12k
1
F
12k
22510 F10
LTC2251/
LTC2250
Figure 10. 1.5V Range ADC
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
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 0.9dB.
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
a low-jitter squaring circuit before the CLK pin (see
Figure 11).
The noise performance of the LTC2251/LTC2250 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.
Figure 11. Sinusoidal Single-Ended CLK Drive
CLK
50
0.1
F
0.1
F
4.7
F
1k
FERRITE
BEAD
CLEAN
SUPPLY
SINUSOIDAL
CLOCK
INPUT
22510 F11
NC7SVU04
LTC2251/
LTC2250
CLK
100
0.1
F
4.7
F
FERRITE
BEAD
CLEAN
SUPPLY
IF LVDS USE FIN1002 OR FIN1018.
FOR PECL, USE AZ1000ELT21 OR SIMILAR
22510 F12
LTC2251/
LTC2250
CLK
5pF-30pF
ETC1-1T
0.1
F
VCM
FERRITE
BEAD
DIFFERENTIAL
CLOCK
INPUT
22510 F13
LTC2251/
LTC2250
Figure 12. CLK Drive Using an LVDS or PECL to CMOS Converter
Figure 13. LVDS or PECL CLK Drive Using a Transformer
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC2252 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:14-Bit, 125/105Msps Low Power 3V ADCs |
| LTC2252CUH | 制造商:Linear Technology 功能描述:Single ADC Pipelined 105Msps 12-bit Parallel 32-Pin QFN EP |
| LTC2252CUH#PBF | 功能描述:IC ADC 12-BIT 105MSPS 3V 32-QFN RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:microPOWER™ 位數(shù):8 采樣率（每秒）:1M 數(shù)據(jù)接口:串行，SPI? 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:- 電壓電源:模擬和數(shù)字 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:24-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:24-VQFN 裸露焊盤（4x4） 包裝:Digi-Reel® 輸入數(shù)目和類型:8 個(gè)單端，單極 產(chǎn)品目錄頁面:892 (CN2011-ZH PDF) 其它名稱:296-25851-6 |
| LTC2252CUH#TRPBF | 功能描述:IC ADC 12BIT 105MSPS 3V 32-QFN RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 位數(shù):14 采樣率（每秒）:83k 數(shù)據(jù)接口:串行，并聯(lián) 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:95mW 電壓電源:雙 ± 工作溫度:0°C ~ 70°C 安裝類型:通孔 封裝/外殼:28-DIP（0.600"，15.24mm） 供應(yīng)商設(shè)備封裝:28-PDIP 包裝:管件 輸入數(shù)目和類型:1 個(gè)單端，雙極 |
| LTC2252IUH | 制造商:Linear Technology 功能描述:ADC Single Pipelined 105Msps 12-bit Parallel 32-Pin QFN EP |
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