參數(shù)資料
型號(hào)： EVAL-AD7985EBZ
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 17/28頁(yè)
文件大?。?/td> 0K
描述： BOARD EVAL FOR AD7985
標(biāo)準(zhǔn)包裝： 1
系列： PulSAR®
ADC 的數(shù)量： 1
位數(shù)： 16
采樣率（每秒）： 2.5M
數(shù)據(jù)接口： SPI?、QSPI?、MICROWIRE? 和 DSP
輸入范圍： 0 ~ 5 V
在以下條件下的電源（標(biāo)準(zhǔn)）： 15.5mW @ 2.5MSPS
工作溫度： -40°C ~ 85°C
已用 IC / 零件： AD7985
已供物品： 板
AD7985
Rev. A | Page 24 of 28
CHAIN MODE WITH BUSY INDICATOR
This mode can be used to daisy-chain multiple AD7985 devices
on a 3-wire serial interface while providing a busy indicator. It
is available only in normal conversion mode (TURBO is low).
This feature is useful for reducing component count and wiring
connections, for example, in isolated multiconverter applications
or for systems with a limited interfacing capacity. Data readback
is analogous to clocking a shift register. A connection diagram
example using three AD7985 devices is shown in Figure 36, and
the corresponding timing is given in Figure 37.
When SDI and CNV are low, SDO is driven low. With SCK high,
a rising edge on CNV initiates a conversion, selects chain mode,
and enables the busy indicator feature. In this mode, CNV is
held high during the conversion phase and the subsequent data
readback.
When all ADCs in the chain have completed their conversions, the
SDO pin of the ADC closest to the digital host (see the AD7985
ADC labeled C in Figure 36) is driven high. This transition on
SDO can be used as a busy indicator to trigger the data read-
back controlled by the digital host. The AD7985 then enters the
acquisition phase and powers down. The data bits stored in the
internal shift register are clocked out, MSB first, by subsequent SCK
falling edges. For each ADC, SDI feeds the input of the internal
shift register and is clocked by the SCK falling edge. Each ADC
in the chain outputs its data MSB first, and 16 × N + 1 clocks
are required to read back the N ADCs. Although the rising edge
can be used to capture the data, a digital host using the SCK
falling edge allows a faster reading rate and consequently more
AD7985 devices in the chain, provided that the digital host has
an acceptable hold time.
CONVERT
DATA IN
CLK
DIGITAL HOST
AD7985
SDI
SDO
CNV
C
SCK
AD7985
SDI
SDO
CNV
A
SCK
IRQ
AD7985
SDI
SDO
CNV
B
SCK
TURBO
07947-
019
Figure 36. Chain Mode with Busy Indicator Connection Diagram
SDOA = SDIB
DA15 DA14 DA13
SCK
1
2
3
35
47
48
tEN
CONVERSION
ACQUISITION
tCONV
tCYC
tACQ
ACQUISITION
CNV = SDIA
DA1
4
15
tSCK
tSCKH
tSCKL
DA0
17
34
16
SDOB = SDIC
DB15 DB14 DB13
DA1
DB1
DB0 DA15 DA14
49
tSSDISCK
tHSDISCK
tHSDO
tDSDO
SDOC
DC15 DC14 DC13
DA1
DA0
DC1
DC0
DA14
19
31
32
18
33
DB1
DB0 DA15
DB15 DB14
tDSDOSDI
tHSCKCNV
DA0
tDSDOSDI
TURBO = 0
tSSCKCNV
07947-
020
Figure 37. Chain Mode with Busy Indicator Serial Interface Timing
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