參數(shù)資料
型號(hào)： LTC2205IUK-14#PBF
廠商： Linear Technology
文件頁(yè)數(shù)： 10/28頁(yè)
文件大?。?/td> 0K
描述： IC ADC 14BIT 65MSPS 48-QFN
標(biāo)準(zhǔn)包裝： 52
位數(shù)： 14
采樣率（每秒）： 65M
數(shù)據(jù)接口： 并聯(lián)
轉(zhuǎn)換器數(shù)目： 1
功率耗散（最大）： 776mW
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： 48-WFQFN 裸露焊盤(pán)
供應(yīng)商設(shè)備封裝： 48-QFN-EP（7x7）
包裝： 管件
輸入數(shù)目和類(lèi)型： 1 個(gè)差分
配用： DC890B-ND - BOARD USB DATA COLLECTION
LTC2205-14
18
220514fb
Figure 7. A 2.25V Range ADC with an External 2.5V Reference
Reference Operation
Figure 6 shows the LTC2205-14 reference circuitry
consisting of a 2.5V bandgap reference, a programmable
gain amplier and control circuit. The LTC2205-14 has
three modes of reference operation: Internal Reference,
1.25V external reference or 2.5V external reference. To
use the internal reference, tie the SENSE pin to VDD. To
use an external reference, simply apply either a 1.25V or
2.5V reference voltage to the SENSE input pin. Both 1.25V
and 2.5V applied to SENSE will result in a full-scale range
of 2.25VP-P (PGA = 0). A 1.25V output, VCM is provided
for a common mode bias for input drive circuitry. An
external bypass capacitor is required for the VCM output.
This provides a high frequency low impedance path to
ground for internal and external circuitry. This is also the
compensation capacitor for the reference; it will not be
stable without this capacitor. The minimum value required
for stability is 2.2μF.
The internal programmable gain amplier provides the
internal reference voltage for the ADC. This amplier has
very stringent settling requirements and is not accessible
for external use.
APPLICATIONS INFORMATION
PGA
1.25V
SENSE
VCM
BUFFER
INTERNAL
ADC
REFERENCE
RANGE
SELECT
AND GAIN
CONTROL
2.5V
BANDGAP
REFERENCE
2.2μF
TIE TO VDD TO USE
INTERNAL 2.5V
REFERENCE
OR INPUT FOR
EXTERNAL 2.5V
REFERENCE
OR INPUT FOR
EXTERNAL 1.25V
REFERENCE
220514 F06
LTC2205-14
Figure 6. Reference Circuit
VCM
SENSE
1.25V
3.3V
2.2μF
1μF
220514 F07
LTC2205-14
LTC1461-2.5
2
6
4
Figure 5. DC Coupled Input with Differential Amplier
–
+
AIN
+
AIN
–
2.2μF
12pF
VCM
LTC2205-14
ANALOG
INPUT
220514 F05
CM
AMPLIFIER = LTC6600-20,
LTC1993, ETC.
HIGH SPEED
DIFFERENTIAL
AMPLIFIER
25Ω
The SENSE pin can be driven ±5% around the nominal 2.5V
or 1.25V external reference inputs. This adjustment range
can be used to trim the ADC gain error or other system
gain errors. When selecting the internal reference, the
SENSE pin should be tied to VDD 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 1μF (or larger) ceramic capacitor.
相關(guān)PDF資料
PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC2205IUK-PBF 制造商:LINER 制造商全稱:Linear Technology 功能描述:16-Bit, 65Msps/40Msps
LTC2205IUK-TR 制造商:LINER 制造商全稱:Linear Technology 功能描述:16-Bit, 65Msps/40Msps
LTC2205IUK-TRPBF 制造商:LINER 制造商全稱:Linear Technology 功能描述:16-Bit, 65Msps/40Msps
LTC2205UK 制造商:LINER 制造商全稱:Linear Technology 功能描述:16-Bit, 65Msps/40Msps
LTC2205UK-14 制造商:LINER 制造商全稱:Linear Technology 功能描述:14-Bit, 65Msps ADC
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