參數(shù)資料
型號(hào)： LTC2301IMS#TRPBF
廠商： Linear Technology
文件頁(yè)數(shù)： 11/26頁(yè)
文件大?。?/td> 0K
描述： IC ADC 12-BIT 1CHN 12-MSOP
標(biāo)準(zhǔn)包裝： 2,500
位數(shù)： 12
采樣率（每秒）： 14k
數(shù)據(jù)接口： I²C，串行
轉(zhuǎn)換器數(shù)目： 1
功率耗散（最大）： 17.5mW
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： 12-TSSOP（0.118"，3.00mm 寬）
供應(yīng)商設(shè)備封裝： 12-MSOP
包裝： 帶卷 (TR)
輸入數(shù)目和類型： 2 個(gè)單端，單極；2 個(gè)單端，雙極；1 個(gè)差分，單極；1 個(gè)差分，雙極
配用： DC1444A-A-ND - BOARD SAR ADC LTC2301
LTC2301/LTC2305
19
23015fb
APPLICATIONS INFORMATION
Continuous Read/Write
Once the conversion cycle is complete, the LTC2301/
LTC2305 can be written to and then read from using the
repeated START (Sr) command. Figure 9 shows a cycle
which begins with a data write, a repeated START, followed
by a read and concluded with a STOP command. After
all 16 bits are read out, a conversion may be initiated by
issuing a STOP command. The following conversion will
be performed using the newly programmed data.
Synchronizing Multiple LTC2301/LTC2305s with a
Global Address Call
In applications where several LTC2301/LTC2305s or other
I2C SAR ADCs from Linear Technology Corporation are
used on the same I2C bus, all converters can be synchro-
nized 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 issues a
START, followed by the global address 1101011, and a
write request. All converters will be selected and acknowl-
edge the request. The master then sends a write byte
(optional) followed by the STOP command. This will update
the channel selection (optional) and simultaneously initi-
ate a conversion for all ADCs on the bus (see Figure 10).
In order to synchronize multiple converters without chang-
ing the channel, a STOP command 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.
Nap Mode
The ADCs enter nap mode after a conversion is complete
(tCONV) if the SLP bit is set to a logic 0. The supply current
decreases to 225μA in nap mode between conversions,
thereby reducing the average power dissipation as the
sample rate decreases. For example, the LTC2301/LTC2305
draw an average of 300μA at a 1ksps sampling rate. The
LTC2301/LTC2305 keep only the reference (VREF) and
reference buffer (REFCOMP) circuitry active when in nap
mode.
Figure 9. Write, Read, START Conversion
Figure 10. Synchronize Multiple LTC2301/LTC2305s with a Global Address Call
S
CONVERSION
NAP
DATA INPUT
ADDRESS
CONVERSION
DATA
OUTPUT
W
ACK
WRITE
7-BIT ADDRESS
Sr
R
ACK
23015 F09
READ
7-BIT ADDRESS
P
S
SDA
SCL
CONVERSION
NAP
LTC2301/LTC2305
DATA OUTPUT
CONVERSION OF ALL LTC2301/05s
W
ACK
WRITE (OPTIONAL)
GLOBAL ADDRESS
P
LTC2301/LTC2305
23015 F10
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