A
參數(shù)資料
型號: LTC2259IUJ-12#TRPBF
廠商: Linear Technology
文件頁數(shù): 13/34頁
文件大?。?/td> 0K
描述: IC ADC 12BIT 80MSPS 40-QFN
產(chǎn)品培訓(xùn)模塊: LTC2262 - Ultra Low Power High Speed ADCs
標(biāo)準(zhǔn)包裝: 2,000
位數(shù): 12
采樣率(每秒): 80M
數(shù)據(jù)接口: 并聯(lián),串行,SPI
轉(zhuǎn)換器數(shù)目: 1
功率耗散(最大): 102mW
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: 40-WFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝: 40-QFN(6x6)
包裝: 帶卷 (TR)
輸入數(shù)目和類型: 1 個差分
配用: DC890B-ND - BOARD USB DATA COLLECTION
LTC2261-12
LTC2260-12/LTC2259-12
20
226112fc
For more information www.linear.com/LTC2261-12
applicaTions inForMaTion
25
200
0.1F
AIN+
AIN–
12pF
0.1F
VCM
LTC2261-12
226112 F07
+
ANALOG
INPUT
HIGH SPEED
DIFFERENTIAL
AMPLIFIER
0.1F
Figure 7. Front-End Circuit Using a High Speed
Differential Amplifier
Reference
The LTC2261-12/LTC2260-12/LTC2259-12 have an inter-
nal 1.25V voltage reference. For a 2V input range using
the internal reference, connect SENSE to VDD. For a 1V
input range using the internal reference, connect SENSE
to ground. For a 2V input range with an external reference,
apply a 1.25V reference voltage to SENSE (Figure 9.)
The input range can be adjusted by applying a voltage to
SENSE that is between 0.625V and 1.30V. The input range
will then be 1.6 VSENSE.
VREF
REFH
SENSE
TIE TO VDD FOR 2V RANGE;
TIE TO GND FOR 1V RANGE;
RANGE = 1.6 VSENSE FOR
0.65V < VSENSE < 1.300V
1.25V
REFL
0.1F
2.2F
INTERNAL ADC
HIGH REFERENCE
BUFFER
226112 F08
5
0.8x
DIFF AMP
INTERNAL ADC
LOW REFERENCE
1.25V BANDGAP
REFERENCE
0.625V
RANGE
DETECT
AND
CONTROL
1F
0.1F
LTC2261-12
Figure 8. Reference Circuit
SENSE
1.25V
EXTERNAL
REFERENCE
1F
VREF
226112 F09
LTC2261-12
Figure 9. Using an External 1.25V Reference
The VREF, REFH and REFL pins should be bypassed as
shown in Figure 8. The 0.1F capacitor between REFH
and REFL should be as close to the pins as possible (not
on the back side of the circuit board).
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