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參數(shù)資料
| 型號： | LTC2226HLU#TR |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | ADC |
| 英文描述： | 1-CH 12-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQFP32 |
| 封裝： | 5 X 5 MM, PLASTIC, MS-026, TQFP-32 |
| 文件頁數(shù)： | 4/16頁 |
| 文件大小： | 679K |
| 代理商： | LTC2226HLU#TR |
LTC2226H
2226hfa
Reference Operation
Figure 6 shows the LTC2226H reference circuitry consist-
ing of a 1.5V bandgap reference, a difference amplifier and
switchingandcontrolcircuit.Theinternalvoltagereference
can be configured for two pin selectable input ranges of
2V (±1V differential) or 1V (±0.5V differential). Tying the
SENSE pin to VDD selects the 2V range; tying the SENSE
pin to VCM 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, VCM. This provides a high
frequency low impedance path to ground for internal and
external circuitry.
The difference amplifier generates the high and low
reference for the ADC. High speed switching circuits are
connected to these outputs and they must be externally
bypassed.
Other voltage ranges in-between the pin selectable ranges
can be programmed with two external resistors as shown
in Figure 7. An external reference can be used by apply-
ing 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 3.8dB.
applicaTions inForMaTion
VCM
REFH
SENSE
TIE TO VDD FOR 2V RANGE;
TIE TO VCM FOR 1V RANGE;
RANGE = 2 VSENSE FOR
0.5V < VSENSE < 1V
1.5V
REFL
2.2
F
2.2
F
INTERNAL ADC
HIGH REFERENCE
BUFFER
0.1
F
2226 F06
LTC2226H
4
DIFF AMP
1
F
1
F
INTERNAL ADC
LOW REFERENCE
1.5V BANDGAP
REFERENCE
1V
0.5V
RANGE
DETECT
AND
CONTROL
Figure 6. Equivalent Reference Circuit
VCM
SENSE
1.5V
0.75V
2.2
F
12k
1
F
12k
2226 F07
LTC2226H
CLK
100
0.1
F
4.7
F
FERRITE
BEAD
CLEAN
SUPPLY
IF LVDS USE FIN1002 OR FIN1018.
FOR PECL, USE AZ1000ELT21 OR SIMILAR
2226 F08
LTC2226H
Figure 7. 1.5V Range ADC
Figure 8. CLK Drive Using an LVDS or PECL to CMOS Converter
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參數(shù)描述 |
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| LTC2226HLX | 制造商:LINER 制造商全稱:Linear Technology 功能描述:12-Bit, 25Msps 125°C ADC in LQFP |
| LTC2226HLX#PBF | 功能描述:IC ADC 12BIT 25MSPS 48-LQFP 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:1,000 系列:- 位數(shù):12 采樣率（每秒）:300k 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:75mW 電壓電源:單電源 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:24-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:24-SOIC 包裝:帶卷 (TR) 輸入數(shù)目和類型:1 個(gè)單端，單極；1 個(gè)單端，雙極 |
| LTC2226HLX-PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:12-Bit, 25Msps 125°C ADC in LQFP |
| LTC2226HLX-TR | 制造商:LINER 制造商全稱:Linear Technology 功能描述:12-Bit, 25Msps 125°C ADC in LQFP |
| LTC2226HLX-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:12-Bit, 25Msps 125°C ADC in LQFP |
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