參數(shù)資料
型號(hào)： 2495
廠商： Linear Technology Corporation
英文描述： 16-Bit 8-/16-Channel ツヒ ADC with PGA, Easy Drive and I2C Interface
中文描述： 16位8-/16-ChannelツヒADC，帶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> 558K
代理商： 2495
LTC2495
22
2495f
channel or conversion configuration is required, this data
can be written into the device and a Stop command will
initiate the next conversion (see Figure 9).
Synchronizing Multiple LTC2495s with a Global
Address Call
In applications where several LTC2495s (or other I
2
C
delta-sigma ADCs from Linear Technology Corporation)
are used on the same I
2
C 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 issues 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 chan-
nel selection (optional) converter configuration (optional)
and simultaneously initiate a start of conversion for all
delta-sigma ADCs on the bus (see Figure 10). In order
Figure 10. Synchronize Multiple LTC2495s with a Global Address Call
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
NAK a global read request.
Driving the Input and Reference
The input and reference pins of the LTC2495 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 LTC2495’s internal oscillator, the input
capacitor array is switched at 123kHz. The effect of the
charge transfer depends on the circuitry driving the
APPLICATIONS INFORMATION
Figure 8. Write, Read, Start Conversion
Figure 9. Start a New Conversion Without Reading Old Conversion Result
7-BIT ADDRESS
CONVERSION
CONVERSION
ADDRESS
SLEEP
DATA OUTPUT
DATA INPUT
7-BIT ADDRESS
S
R
W ACK
ACK
WRITE
Sr
P
READ
2495 F08
7-BIT ADDRESS
CONVERSION
CONVERSION
SLEEP
DATA INPUT
S
W ACK
WRITE (OPTIONAL)
P
2495 F09
GLOBAL ADDRESS
SCL
SDA
LTC2495
LTC2495
LTC2495
…
ALL LTC2495s IN SLEEP
CONVERSION OF ALL LTC2495s
DATA INPUT
S
W ACK
WRITE (OPTIONAL)
P
2495 F10
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