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參數(shù)資料
| 型號： | LTC1407CMSE |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | ADC |
| 英文描述： | Serial 12-Bit/14-Bit, 3Msps Simultaneous Sampling Simultaneous Sampling |
| 中文描述： | 2-CH 12-BIT PROPRIETARY METHOD ADC, SERIAL ACCESS, PDSO10 |
| 封裝： | PLASTIC, MSOP-10 |
| 文件頁數(shù)： | 13/24頁 |
| 文件大?。?/td> | 443K |
| 代理商： | LTC1407CMSE |
13
LTC1407/LTC1407A
1407f
APPLICATIOU
INPUT RANGE
The analog inputs of the LTC1407/LTC1407A may be
driven fully differentially with a single supply. Either input
may swing up to 3V, provided the differential swing is no
greater than 2.5V. In the valid input range, the noninvert-
ing input of each channel should always be more positive
than the inverting input of each channel. The 0V to 2.5V
range is also ideally suited for single-ended input use with
single supply applications. The common mode range of
the inputs extend from ground to the supply voltage V
DD
.
If the difference between the CH0
+
and CH0
–
inputs or the
CH1
+
and CH1
–
inputs exceeds 2.5V, the output code will
stay fixed at all ones, and if this difference goes below 0V,
the ouput code will stay fixed at all zeros.
W
U
U
INTERNAL REFERENCE
The LTC1407/LTC1407A have an on-chip, temperature
compensated, bandgap reference that is factory trimmed
near 2.5V to obtain a precise 2.5V input span. The refer-
ence amplifier output V
REF
, (Pin 3) must be bypassed with
a capacitor to ground. The reference amplifier is stable with
capacitors of 1
F or greater. For the best noise perfor-
mance, a 10
μ
F ceramic or a 10
μ
F tantalum in parallel with
a 0.1
μ
F ceramic is recommended. The V
REF
pin can be
overdriven with an external reference as shown in Figure2.
The voltage of the external reference must be higher than
the 2.5V of the open-drain P-channel output of the internal
reference. The recommended range for an external refer-
ence is 2.55V to V
DD
. An external reference at 2.55V will
see a DC quiescent load of 0.75mA and as much as 3mA
during conversion.
INPUT SPAN VERSUS REFERENCE VOLTAGE
The differential input range has a unipolar voltage span
that equals the difference between the voltage at the
reference buffer output V
REF
(Pin 3) and the voltage at the
Exposed Pad ground. The differential input range of ADC
is 0V to 2.5V when using the internal reference. The
internal ADC is referenced to these two nodes. This
relationship also holds true with an external reference.
DIFFERENTIAL INPUTS
The ADC will always convert the unipolar difference of
CH0
+
minus CH0
–
or the unipolar difference of CH1
+
minus CH1
–
, independent of the common mode voltage at
either set of inputs. The common mode rejection holds up
at high frequencies (see Figure 3.) The only requirement is
that both inputs not go below ground or exceed V
DD
.
Figure 2
LTC1407/
LTC1407A
GND
V
REF
1407 F02
3
11
10
μ
F
3V REF
FREQUENCY (Hz)
–80
C–40
0
–100
–60
–20
100
1k
1407 G08
–120
10k
100k
1M
10M
100M
CH0
CH1
Figure 3. CMRR vs Frequency
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| LTC1407 | Serial 12-Bit/14-Bit, 3Msps Simultaneous Sampling Simultaneous Sampling |
| LTC1407A | Serial 12-Bit/14-Bit, 3Msps Simultaneous Sampling Simultaneous Sampling |
| LTC1407AIMSE | Serial 12-Bit/14-Bit, 3Msps Simultaneous Sampling Simultaneous Sampling |
| LTC1407IMSE | Serial 12-Bit/14-Bit, 3Msps Simultaneous Sampling Simultaneous Sampling |
| LTC1409C | 12-Bit, 800ksps Sampling A/D Converter with Shutdown |
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| LTC1407CMSE#PBF | 功能描述:IC ADC 12BIT 3MSPS 10-MSOP 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 個單端，單極 產(chǎn)品目錄頁面:892 (CN2011-ZH PDF) 其它名稱:296-25851-6 |
| LTC1407CMSE#TR | 功能描述:IC ADC 12BIT 3MSPS SAMPLE 10MSOP 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 個單端，單極 |
| LTC1407CMSE#TRPBF | 功能描述:IC ADC 12BIT 3MSPS SAMPLE 10MSOP 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 個單端，單極 |
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