參數(shù)資料
型號(hào)： EVAL-AD7622CBZ
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 15/28頁(yè)
文件大?。?/td> 0K
描述： BOARD EVALUATION FOR AD7622
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）： 2M
數(shù)據(jù)接口： 串行，并聯(lián)
輸入范圍： ±VREF
在以下條件下的電源（標(biāo)準(zhǔn)）： 70mW @ 2MSPS
工作溫度： -40°C ~ 85°C
已用 IC / 零件： AD7622
已供物品： 板
相關(guān)產(chǎn)品： AD7622BSTZ-ND - IC ADC 16BIT DIFFERENTIAL 48LQFP
AD7622BCPZ-ND - IC ADC 16BIT DIFFERENTL 48-LFCSP
AD7622BSTZRL-ND - IC ADC 16BIT DIFFERENTL 48-LQFP
AD7622BCPZRL-ND - IC ADC 16BIT DIFFERENTL 48-LFCSP
AD7622
Rev. 0 | Page 22 of 28
8-Bit Interface (Master or Slave)
The BYTESWAP pin allows a glueless interface to an 8-bit bus.
As shown in Figure 36, when BYTESWAP is low, the LSB byte is
output on D[7:0] and the MSB is output on D[15:8]. When
BYTESWAP is high, the LSB and MSB bytes are swapped, and
the LSB is output on D[15:8] and the MSB is output on D[7:0].
By connecting BYTESWAP to an address line, the 16-bit data
can be read in two bytes on either D[15:8] or D[7:0]. This
interface can be used in both master and slave parallel reading
modes.
CS
RD
BYTESWAP
PINS D[15:8]
PINS D[7:0]
HI-Z
HIGH BYTE
LOW BYTE
HIGH BYTE
HI-Z
t12
t13
0
60
23-
034
Figure 36. 8-Bit and 16-Bit Parallel Interface
SERIAL INTERFACE
The AD7622 is configured to use the serial interface when
SER/PAR = high. The AD7622 outputs 16 bits of data, MSB
first, on the SDOUT pin. This data is synchronized with the
16 clock pulses provided on the SCLK pin. The output data is
valid on both the rising and falling edge of the data clock.
MASTER SERIAL INTERFACE
Internal Clock
The AD7622 is configured to generate and provide the serial
data clock SCLK when the EXT/INT pin = low. The AD7622
also generates a SYNC signal to indicate to the host when the
serial data is valid. The serial clock SCLK and the SYNC signal
can be inverted. Depending on the state of the read during
convert input, RDC/SDIN, the data can be read after each
conversion or during the following conversion. Figure 37 and
Figure 38 show detailed timing diagrams of these two modes.
Usually, because the AD7622 is used with a fast throughput, the
master read during conversion mode, RDC/SDIN = high, is the
most recommended serial mode. In this mode, the serial clock
and data toggle at appropriate instants, minimizing potential
feedthrough between digital activity and critical conversion
decisions. In this mode, the SCLK period changes because the
LSBs require more time to settle and the SCLK is derived from the
SAR conversion cycle.
In read after conversion mode, RDC/SDIN = low, it should be
noted that unlike other modes, the BUSY signal returns low
after the 16 data bits are pulsed out and not at the end of the
conversion phase, resulting in a longer BUSY width. As a result,
the maximum throughput cannot be achieved in this mode.
In addition, in read after convert mode, the SCLK frequency
can be slowed down to accommodate different hosts using the
DIVSCLK[1:0] inputs. Refer to Table 4 for the SCLK timing
details when using these inputs.
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