參數(shù)資料
型號(hào)： LTC2268IUJ-14#TRPBF
廠商： Linear Technology
文件頁(yè)數(shù)： 14/32頁(yè)
文件大?。?/td> 0K
描述： IC ADC 14BIT 125MSPS DUAL 40QFN
標(biāo)準(zhǔn)包裝： 2,000
位數(shù)： 14
采樣率（每秒）： 125M
數(shù)據(jù)接口： Serial LVDS
轉(zhuǎn)換器數(shù)目： 2
功率耗散（最大）： 364mW
電壓電源： 單電源
工作溫度： -40°C ~ 85°C
安裝類(lèi)型： 表面貼裝
封裝/外殼： 40-WFQFN 裸露焊盤(pán)
供應(yīng)商設(shè)備封裝： 40-QFN（6x6）
包裝： 帶卷 (TR)
輸入數(shù)目和類(lèi)型： 2 Differential; 2 Single-Ended
配用： DC1371A-ND - BOARD USB DATA ACQUISITION HS
LTC2268-14/
LTC2267-14/LTC2266-14
21
22687614fa
Reference
The LTC2268-14/LTC2267-14/LTC2266-14 has an internal
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.
applicaTions inForMaTion
The reference is shared by both ADC channels, so it is
not possible to independently adjust the input range of
individual channels.
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 backside of the circuit board).
Encode Input
The signal quality of the encode inputs strongly affects
the A/D noise performance. The encode inputs should be
treated as analog signals — do not route them next to
digital traces on the circuit board. There are two modes
of operation for the encode inputs: the differential encode
mode (Figure 10), and the single-ended encode mode
(Figure 11).
Figure 8. Reference Circuit
Figure 9. Using an External 1.25V Reference
Figure 10. Equivalent Encode Input Circuit
for Differential Encode Mode
Figure 11. Equivalent Encode Input Circuit
for Single-Ended Encode Mode
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
226814 F08
LTC2268-14
5
0.8x
DIFF AMP
INTERNAL ADC
LOW REFERENCE
1.25V BANDGAP
REFERENCE
0.625V
RANGE
DETECT
AND
CONTROL
1F
0.1F
SENSE
1.25V
EXTERNAL
REFERENCE
1F
VREF
226814 F09
LTC2268-14
VDD
LTC2268-14
226814 F10
ENC–
ENC+
15k
VDD
DIFFERENTIAL
COMPARATOR
30k
ENC+
ENC–
226814 F11
0V
1.8V TO 3.3V
LTC2268-14
CMOS LOGIC
BUFFER
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