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參數資料
| 型號： | LTC2254 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 14-Bit, 125/105Msps Low Power 3V ADCs |
| 中文描述： | 14位，125/105Msps低功耗3V的模數轉換器 |
| 文件頁數： | 15/24頁 |
| 文件大?。?/td> | 608K |
| 代理商： | LTC2254 |
LTC2255/LTC2254
15
22554f
For input frequencies above 70MHz, the input circuits of
Figure 6, 7 and 8 are recommended. The balun trans-
former gives better high frequency response than a flux
coupled center tapped transformer. The coupling capaci-
tors allow the analog inputs to be DC biased at 1.5V. In
Figure 8, the series inductors are impedance matching
elements that maximize the ADC bandwidth.
APPLICATIOU
W
U
U
Figure 6. Recommended Front End Circuit for
Input Frequencies Between 70MHz and 170MHz
Figure 8. Recommended Front End Circuit for
Input Frequencies Above 300MHz
Figure 7. Recommended Front End Circuit for
Input Frequencies Between 170MHz and 300MHz
Figure 9. Equivalent Reference Circuit
Reference Operation
Figure 9 shows the LTC2255/LTC2254 reference circuitry
consisting of a 1.5V bandgap reference, a difference
amplifier and switching and control circuit. The internal
voltage reference can be configured for two pin selectable
input ranges of 2V (
±
1V differential) or 1V (
±
0.5V differ-
ential). Tying the SENSE pin to V
DD
selects the 2V range;
tying the SENSE pin to V
CM
selects the 1V range.
The 1.5V bandgap reference serves two functions: its
output provides a DC bias point for setting the common
mode voltage of any external input circuitry; additionally,
the reference is used with a difference amplifier to gener-
ate the differential reference levels needed by the internal
ADC circuitry. An external bypass capacitor is required for
the 1.5V reference output, V
CM
. This provides a high
frequency low impedance path to ground for internal and
external circuitry.
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
25
25
12
12
0.1
μ
F
A
IN+
A
IN–
8pF
2.2
μ
F
V
CM
LTC2255/
LTC2254
ANALOG
INPUT
0.1
μ
F
0.1
μ
F
T1
T1 = MA/COM, ETC 1-1-13
RESISTORS, CAPACITORS
ARE 0402 PACKAGE SIZE
22554 F06
25
25
0.1
μ
F
A
IN+
A
IN–
2.2
μ
F
V
CM
LTC2255/
LTC2254
ANALOG
INPUT
0.1
μ
F
0.1
μ
F
T1
T1 = MA/COM, ETC 1-1-13
RESISTORS, CAPACITORS, INDUCTORS
ARE 0402 PACKAGE SIZE
22554 F08
8.2nH
8.2nH
25
25
0.1
μ
F
A
IN+
A
IN–
2.2
μ
F
V
CM
LTC2255/
LTC2254
ANALOG
INPUT
0.1
μ
F
0.1
μ
F
T1
T1 = MA/COM, ETC 1-1-13
RESISTORS, CAPACITORS
ARE 0402 PACKAGE SIZE
22554 F07
V
CM
REFH
SENSE
TIE TO V
DD
FOR 2V RANGE;
TIE TO V
FOR 1V RANGE;
RANGE = 2 V
SENSE
FOR
0.5V < V
SENSE
< 1V
1.5V
REFL
2.2
μ
F
2.2
μ
F
INTERNAL ADC
HIGH REFERENCE
BUFFER
0.1
μ
F
22554 F09
LTC2255/LTC2254
4
DIFF AMP
1
μ
F
1
μ
F
INTERNAL ADC
LOW REFERENCE
1.5V BANDGAP
REFERENCE
1V
0.5V
RANGE
DETECT
AND
CONTROL
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| LTC2254IUH | 制造商:Linear Technology 功能描述:ADC Single Pipelined 105Msps 14-bit Parallel 32-Pin QFN EP |
| LTC2254IUH#PBF | 功能描述:IC ADC 14-BIT 105MSPS 3V 32-QFN RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 其它有關文件:TSA1204 View All Specifications 標準包裝:1 系列:- 位數:12 采樣率（每秒）:20M 數據接口:并聯(lián) 轉換器數目:2 功率耗散（最大）:155mW 電壓電源:模擬和數字 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-TQFP 供應商設備封裝:48-TQFP（7x7） 包裝:Digi-Reel® 輸入數目和類型:4 個單端，單極；2 個差分，單極 產品目錄頁面:1156 (CN2011-ZH PDF) 其它名稱:497-5435-6 |
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