() =
參數(shù)資料
型號： DC1010A-A
廠商： Linear Technology
文件頁數(shù)： 15/32頁
文件大?。?/td> 0K
描述： BOARD DELTA SIGMA ADC LTC2493
軟件下載： QuikEval System
設計資源： DC1010A Design File
DC1010A Schematic
標準包裝： 1
系列： Easy Drive™, QuikEval™
ADC 的數(shù)量： 1
位數(shù)： 24
采樣率（每秒）： 15
數(shù)據(jù)接口： I²C，串行
已用 IC / 零件： LTC2493
已供物品： 板
相關產(chǎn)品： LTC2493IDE#TRPBF-ND - IC ADC 24BIT DELTA SIG 14-DFN
LTC2493CDE#TRPBF-ND - IC ADC 24BIT DELTA SIG 14-DFN
LTC2493CDE#PBF-ND - IC ADC 24BIT DELTA SIG 14-DFN
LTC2493IDE#PBF-ND - IC ADC 24BIT DELTA SIG 14-DFN
LTC2493
22
2493fd
Figure 11. Equivalent Analog Input Circuit
IINI IN
VV
R
AVG
IN CM
REFCM
EQ
+
() = () =
–
()
.
05
IIREF
VV
V
R
AVG
REFREF CM
IN CM
+
() ≈
+
()
15
05
.–
.
()
EEQ
IN
REFEQ
REF
REFCM
V
VR
where
VREF
REF
V
–
:
(
2
=
+
))
–
,
=
=
+
REFREF
VININWHERE IN AN
IN
2
DDINARE THESELECTEDINPUTCHANNELS
V
IN
IN CM
+
=
()
––
.
IN
RM INTERNALOSCILLATOR
EQ
=
2
2716
00HzMODE
R
2.98MINTERNALOSCILLATOR 50Hz/60
EQ =
HHz MODE
R
0.833 10
/f
EXTERNALOSCIL
EQ
12
EOSC
=
()
LLATOR
IN+
IN–
10k
INTERNAL
SWITCH
NETWORK
10k
CEQ
12F
10k
IIN–
REF+
IREF+
IIN+
IREF–
2493 F11a
SWITCHING FREQUENCY
fSW = 123kHz INTERNAL OSCILLATOR
fSW = 0.4 fEOSC EXTERNAL OSCILLATOR
REF–
10k
100
INPUT
MULTIPLEXER
100
Synchronizing Multiple LTC2493s with a Global
Address Call
In applications where several LTC2493s (or other I2C
delta-sigma ADCs from Linear Technology Corporation)
are used on the same I2C bus, all converters can be syn-
chronized through the use of a global address call. Prior
to issuing the global address call, all converters must
have completed a conversion cycle. The master then is-
sues a START, followed by the global address 1110111,
and a write request. All converters will be selected and
acknowledge the request. The master then sends a write
byte (optional) followed by the STOP command. This
will update the channel selection (optional) converter
configuration (optional) and simultaneously initiate a start
of conversion for all delta-sigma ADCs on the bus (see
GLOBAL ADDRESS
SCL
SDA
LTC2493
…
S
W ACK WRITE (OPTIONAL)
P
2493 F10
ALL LTC2493s IN SLEEP
CONVERSION OF ALL LTC2493s
DATA INPUT
Figure 10. Synchronize Multiple LTC2493s with a Global Address Call
Figure 10). In order to synchronize multiple converters
without changing the channel or configuration, a STOP
may be issued after acknowledgement of the global write
command. Global read commands are not allowed and
the converters will NACK a global read request.
Driving the Input and Reference
The input and reference pins of the LTC2493 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.
applicaTions inForMaTion
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參數(shù)描述
DC1010A-B 功能描述:BOARD DELTA SIGMA ADC LTC2489 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - 模數(shù)轉換器 (ADC) 系列:Easy Drive™, QuikEval™ 產(chǎn)品培訓模塊:Obsolescence Mitigation Program 標準包裝:1 系列:- ADC 的數(shù)量:1 位數(shù):12 采樣率（每秒）:94.4k 數(shù)據(jù)接口:USB 輸入范圍:±VREF/2 在以下條件下的電源（標準）:- 工作溫度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，軟件
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