- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄10289 > LTC1850CFW (Linear Technology)IC ADC 10BIT 1.25MSPS 48-TSSOP PDF資料下載
參數(shù)資料
| 型號(hào)： | LTC1850CFW |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 7/28頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 10BIT 1.25MSPS 48-TSSOP |
| 標(biāo)準(zhǔn)包裝： | 39 |
| 位數(shù)： | 10 |
| 采樣率（每秒）： | 1.25M |
| 數(shù)據(jù)接口： | 并聯(lián) |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 50mW |
| 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： | 48-TFSOP（0.240"，6.10mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 48-TSSOP |
| 包裝： | 管件 |
| 輸入數(shù)目和類型： | 8 個(gè)單端，單極；8 個(gè)單端，雙極；4 個(gè)差分，單極；4 個(gè)差分，雙極 |
第1頁第2頁第3頁第4頁第5頁第6頁當(dāng)前第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁
15
LTC1850/LTC1851
18501f
Table 2. Input Span Table
INPUT SPAN
UNI/BIP
PGA
REFCOMP = 4.096V
0
0 – REFCOMP/2
0 – 2.048V
0
1
0 – REFCOMP
0 – 4.096V
10
±REFCOMP/4
±1.024V
11
±REFCOMP/2
±2.048V
It should be noted that the bipolar input span of the
LTC1850/LTC1851 does not allow negative inputs with
respect to ground. The LTC1850/LTC1851 have a unique
differential sample-and-hold circuit that allows rail-to-rail
inputs. The ADC will always convert the difference of the
“+” and “–” inputs independent of the common mode
voltage. The common mode rejection holds up to high
frequencies. The only requirement is that both inputs can
not exceed the VDD power supply voltage or ground. When
a bipolar input span is selected the “+” input can swing
±full scale relative to the “–” input but neither input can
exceed VDD or go below ground.
Integral nonlinearity errors (INL) and differential nonlin-
earity errors (DNL) are independent of the common mode
voltage, however, the bipolar zero error (BZE) will vary.
The change in BZE is typically less than 0.1% of the
common mode voltage.
Some AC applications may have their performance lim-
ited by distortion. The ADC and many other circuits exhibit
higher distortion when signals approach the supply or
ground. THD will degrade as the inputs approach either
power supply rail. Distortion can be reduced by reducing
the signal amplitude and keeping the common mode
voltage at approximately midsupply.
Driving the Analog Inputs
The inputs of the LTC1850/LTC1851 are easy to drive.
Each of the analog inputs can be used as a single-ended
input relative to the input common pin (CH0-COM, CH1-
COM, etc.) or in pairs (CH0 and CH1, CH2 and CH3, CH4
and CH5, CH6 and CH7) for differential inputs. Regardless
of the MUX configuration, the “+” and “–” inputs are
sampled at the same instant. Any unwanted signal that is
common mode to both inputs will be reduced by the
common mode rejection of the sample-and-hold circuit.
The inputs draw only one small current spike while charg-
ing the sample-and-hold capacitors at the end of conver-
sion. During conversion, the analog inputs draw only a
small leakage current. If the source impedance of the
driving circuit is low, then the LTC1850/LTC1851 inputs
can be driven directly. As source impedance increases, so
will acquisition time. For minimum acquisition time with
high source impedance, a buffer amplifier should be used.
The only requirement is that the amplifier driving the
analog input(s) must settle after the small current spike
before the next conversion starts (settling time must be
150ns for full throughput rate).
Choosing an Input Amplifier
Choosing an input amplifier is easy if a few requirements
are taken into consideration. First, to limit the magnitude
of the voltage spike seen by the amplifier from charging
the sampling capacitor, choose an amplifier that has a low
output impedance (<100
) at the closed-loop bandwidth
frequency. For example, if an amplifier is used in a gain of
+1 and has a unity-gain bandwidth of 50MHz, then the
output impedance at 50MHz should be less than 100
.
The second requirement is that the closed-loop bandwidth
must be greater than 20MHz to ensure adequate small-
signal settling for full throughput rate. The following list is
a summary of the op amps that are suitable for driving the
LTC1850/LTC1851, more detailed information is available
in the Linear Technology Databooks, the LinearView
TM
CD-ROM and on our web site at www.linear-tech.com.
LT
1360: 50MHz Voltage Feedback Amplifier.
±2.5V to
±15V supplies. 5mA supply current. Low distortion.
LT1363: 70MHz Voltage Feedback Amplifier.
±2.5V to
±15V supplies. 7.5mA supply current. Low distortion.
LT1364/LT1365: Dual and Quad 70MHz Voltage Feedback
Amplifiers.
±2.5V to ±15V supplies. 7.5mA supply current
per amplifier. Low distortion.
APPLICATIO S I FOR ATIO
WU
UU
LinearView is a trademark of Linear Technology Corporation.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MS27499E16F8P | CONN RCPT 8POS BOX MNT W/PINS |
| AD7707BRU-REEL7 | IC ADC 16BIT 3CH 20-TSSOP T/R |
| MS27497T16B8PA | CONN RCPT 8POS WALL MNT W/PINS |
| D38999/24MF32BA | CONN HSG RCPT 32POS JAM NUT SCKT |
| MS27497E14A18P | CONN RCPT 18POS WALL MNT W/PINS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC1850CFW#PBF | 功能描述:IC ADC 10BIT 1.25MSPS 48-TSSOP 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):16 采樣率（每秒）:45k 數(shù)據(jù)接口:串行 轉(zhuǎn)換器數(shù)目:2 功率耗散（最大）:315mW 電壓電源:模擬和數(shù)字 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:28-SOIC W 包裝:帶卷 (TR) 輸入數(shù)目和類型:2 個(gè)單端，單極 |
| LTC1850CFW#TR | 功能描述:IC ADC 10BIT 1.25MSPS 48-TSSOP RoHS:否 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):16 采樣率（每秒）:45k 數(shù)據(jù)接口:串行 轉(zhuǎn)換器數(shù)目:2 功率耗散（最大）:315mW 電壓電源:模擬和數(shù)字 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:28-SOIC W 包裝:帶卷 (TR) 輸入數(shù)目和類型:2 個(gè)單端，單極 |
| LTC1850CFW#TRPBF | 功能描述:IC ADC 10BIT 1.25MSPS 48-TSSOP 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):16 采樣率（每秒）:45k 數(shù)據(jù)接口:串行 轉(zhuǎn)換器數(shù)目:2 功率耗散（最大）:315mW 電壓電源:模擬和數(shù)字 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:28-SOIC W 包裝:帶卷 (TR) 輸入數(shù)目和類型:2 個(gè)單端，單極 |
| LTC1850IFW | 功能描述:IC ADC 10BIT 1.25MSPS 48-TSSOP RoHS:否 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):16 采樣率（每秒）:45k 數(shù)據(jù)接口:串行 轉(zhuǎn)換器數(shù)目:2 功率耗散（最大）:315mW 電壓電源:模擬和數(shù)字 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:28-SOIC W 包裝:帶卷 (TR) 輸入數(shù)目和類型:2 個(gè)單端，單極 |
| LTC1850IFW#PBF | 功能描述:IC ADC 10BIT 1.25MSPS 48-TSSOP 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):16 采樣率（每秒）:45k 數(shù)據(jù)接口:串行 轉(zhuǎn)換器數(shù)目:2 功率耗散（最大）:315mW 電壓電源:模擬和數(shù)字 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:28-SOIC W 包裝:帶卷 (TR) 輸入數(shù)目和類型:2 個(gè)單端，單極 |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。