參數(shù)資料
型號(hào)： LTC2487CDETRPBF
廠(chǎng)商： Linear Technology Corporation
英文描述： 16-Bit 2-/4-Channel ADC with PGA, Easy Drive and I2C Interface
中文描述： 16位2-/4-Channel型ADC PGA巡回賽，輕松驅(qū)動(dòng)和I2C接口
文件頁(yè)數(shù)： 22/32頁(yè)
文件大?。?/td> 612K
代理商： LTC2487CDETRPBF
LTC2487
2487fa
Figure 11. Equivalent Analog Input Circuit
IN+
IN
–
10k
INTERNAL
SWITCH
NETWORK
10k
C
EQ
12
μ
F
10k
I
IN–
REF
+
I
REF+
I
IN+
I
REF–
2487 F11
SWITCHING FREQUENCY
f
SW
= 123kHz INTERNAL OSCILLATOR
f
SW
= 0.4 f
EOSC
EXTERNAL OSCILLATOR
REF
–
10k
100
INPUT
MULTIPLEXER
100
I IN
I IN
V
V
R
AVG
)
:
AVG
IN CM
(
REF CM
(
EQ
V
+
)
=
)
=
–
)
)
.5
I REF
where
V
V
R
AVG
REF
REF CM
0 5
.
IN CM
(
+
≈
+
(
)
1 5
.
–
(
)
)
EQ
IN
REF
V
EQ
REF
V
REF CM
V
V
R
REF
REF
–
(
2
=
+
)
–
2
,
=
=
+
+
REF
REF
V
IN
IN
WHEREIN AN
2
IN
DIN ARE THE SELECTEDINPUT CHANNELS
V
IN
IN CM
(
+
=
)
–
.
IN
R
R
M INTERNAL OSCILLATOR
2 71
2.98M INTERNAL OSCILLATOR50Hz/60
(
EQ
EQ
=
R
EQ
=
6
0HzMODE
Hz MODE
0.833 10
/f
EXTERNAL OSCIL
12
EOSC
=
)
LATOR
Driving the Input and Reference
The input and reference pins of the LTC2487 are connected
directly to a switched capacitor network. Depending on
the relationship between the differential input voltage and
the differential reference voltage, these capacitors are
switched between these four pins. Each time a capacitor
is switched between two of these pins, a small amount
of charge is transferred. A simplified equivalent circuit is
shown in Figure 11.
When using the LTC2487’s internal oscillator, the input
capacitor array is switched at 123kHz. The effect of the
charge transfer depends on the circuitry driving the
input/reference pins. If the total external RC time constant
is less than 580ns the errors introduced by the sampling
process are negligible since complete settling occurs.
Typically, the reference inputs are driven from a low
impedance source. In this case, complete settling occurs
even with large external bypass capacitors. The inputs
(CH0-CH3, COM), on the other hand, are typically driven
from larger source resistances. Source resistances up
to 10k may interface directly to the LTC2487 and settle
completely; however, the addition of external capacitors
at the input terminals in order to filter unwanted noise
(antialiasing) results in incomplete settling.
Automatic Differential Input Current Cancellation
In applications where the sensor output impedance is
low (up to 10k
W
with no external bypass capacitor or up
to 500
W
with 0.001μF bypass), complete settling of the
input occurs. In this case, no errors are introduced and
direct digitization is possible.
applicaTions inForMaTion
相關(guān)PDF資料
PDF描述
LTC2487IDEPBF 16-Bit 2-/4-Channel ADC with PGA, Easy Drive and I2C Interface
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LTC2489IDETRPBF 16-Bit 2-/4-Channel ADC with Easy Drive Input Current Cancellation and I2C Interface
LTC2489 16-Bit 2-/4-Channel ADC with Easy Drive Input Current Cancellation and I2C Interface
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LTC2488CDE#PBF 功能描述:IC ADC 16BIT DELTA SIG 14-DFN RoHS:是 類(lèi)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(lèi)型:表面貼裝 封裝/外殼:24-VFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:24-VQFN 裸露焊盤(pán)（4x4） 包裝:Digi-Reel® 輸入數(shù)目和類(lèi)型:8 個(gè)單端，單極 產(chǎn)品目錄頁(yè)面:892 (CN2011-ZH PDF) 其它名稱(chēng):296-25851-6
LTC2488CDE#TRPBF 功能描述:IC ADC 16BIT DELTA SIG 14-DFN RoHS:是 類(lèi)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:2,500 系列:- 位數(shù):16 采樣率（每秒）:15 數(shù)據(jù)接口:MICROWIRE?，串行，SPI? 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:480µW 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:38-WFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:38-QFN（5x7） 包裝:帶卷 (TR) 輸入數(shù)目和類(lèi)型:16 個(gè)單端，雙極；8 個(gè)差分，雙極 配用:DC1011A-C-ND - BOARD DELTA SIGMA ADC LTC2494
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