參數(shù)資料
型號(hào)： AD7785BRUZ-REEL
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 17/32頁(yè)
文件大小： 0K
描述： IC ADC 20BIT 3CH LN LP 16-TSSOP
標(biāo)準(zhǔn)包裝： 2,500
位數(shù)： 20
采樣率（每秒）： 470
數(shù)據(jù)接口： MICROWIRE?，QSPI?，串行，SPI?
轉(zhuǎn)換器數(shù)目： 1
電壓電源： 模擬和數(shù)字
工作溫度： -40°C ~ 105°C
安裝類型： 表面貼裝
封裝/外殼： 16-TSSOP（0.173"，4.40mm 寬）
供應(yīng)商設(shè)備封裝： 16-TSSOP
包裝： 帶卷 (TR)
輸入數(shù)目和類型： 3 個(gè)差分，單極；3 個(gè)差分，雙極
配用： EVAL-AD7785EBZ-ND - BOARD EVALUATION FOR AD7785
AD7785
Rev. 0 | Page 24 of 32
Continuous Read
Rather than write to the communications register to access
the data each time a conversion is complete, the AD7785
can be configured so that the conversions are placed on the
DOUT/RDY line automatically. By writing 01011100 to the
communications register, the user needs only to apply the 24
SCLK cycles to the ADC, and the 20-bit result followed by four
1s is automatically placed on the DOUT/RDY line when a
conversion is complete. The ADC should be configured for
continuous conversion mode.
When DOUT/RDY goes low to indicate the end of a conver-
sion, sufficient SCLK cycles must be applied to the ADC, and
the data conversion is placed on the DOUT/RDY line. When
the conversion is read, DOUT/RDY returns high until the next
conversion is available. In this mode, the data can be read only
once. In addition, the user must ensure that the data-word is
read before the next conversion is complete. If the user has
not read the conversion before the completion of the next
conversion, or if insufficient serial clocks are applied to the
AD7785 to read the word, the serial output register is reset
when the next conversion is completed, and the new conversion
is placed in the output serial register.
To exit the continuous read mode, the instruction 01011000
must be written to the communications register while the
DOUT/RDY pin is low. While in the continuous read mode,
the ADC monitors activity on the DIN line so that it can receive
the instruction to exit the continuous read mode. Additionally,
a reset occurs if 32 consecutive 1s are seen on DIN. Therefore,
DIN should be held low in continuous read mode until an
instruction is written to the device.
06721-
019
DIN
SCLK
DOUT/RDY
CS
0x5C
DATA
Figure 19. Continuous Read
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