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| 型號： | AD7658BSTZ-REEL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | 250 kSPS, 6-Channel,Simultaneous Sampling, Bipolar 12/14/16-Bit ADC |
| 中文描述： | 6-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL/PARALLEL ACCESS, PQFP64 |
| 封裝： | ROHS COMPLIANT, MS-026BCD, LQFP-64 |
| 文件頁數(shù)： | 20/25頁 |
| 文件大?。?/td> | 308K |
| 代理商： | AD7658BSTZ-REEL |
AD7658/AD7657/AD7656
Preliminary Technical Data
Rev. PrI | Page 20 of 25
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Figure 10. Serial Interface with two DOUT lines.
Serial Read Operation
Figure 11 shows the timing diagram for reading data from the
AD7658/AD7657/AD7656 in serial mode. The SCLK input
signal provides the clock source for the serial interface. The CS
signal goes low to access data from the
AD7658/AD7657/AD7656. The falling edge of CS takes the bus
out of three-state and clocks out the MSB of the 12/14/16-bit
conversion result. The ADCs output 16- bits for each conversion
result. The data stream of the AD7658 consists of four leading
zeros followed by 12 bits of conversion data provided MSB first;
the data stream of the AD7657 consists of two leading zeros,
followed by the 14-bits of conversion data provided MSB first;
the data stream of the AD7656 consists of sixteen bits of
conversion data provided MSB first. The first bit of the
conversion result is valid on the first SCLK falling edge after the
CS falling edge. The subsequent 15 data bits of the data are
clocked out on rising edge of the SCLK signal. Data is valid on
the SCLK falling edge. Sixteen clock pulses must be provided to
the AD7658/AD7657/AD7656 to access each conversion result.
Figure 11 shows how a 16 SCLK read is used to access the
conversion results.
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Figure 11. Serial Read Operation
Daisy-Chain Mode(DCEN =1, SER/PAR = 1)
When reading conversion data back from the
AD7658/AD7657/AD7656 using the three/two DOUT pins it is
possible to Configure the AD7658/AD7657/AD7656 to operate
in Daisy-Chain Mode, using the DCEN pin. This Daisy-Chain
feature allows multiple AD7658/AD7657/AD7656 devices to be
cascaded together. This feature is useful for reducing
component count and wiring connections. An example
connection of two devices is shown in Figure 12, this
configuration shows two DOUT lines being used. Simultaneous
sampling of the 12 Analog Inputs is possible by using a
common CONVST signal. The DB5, DB4 and DB3 data pins are
used as Data input pins, DCIN[A:C], for the Daisy-Chain Mode.
The rising edge of CONVST is used to initiate a conversion on
the AD7658/AD7657/AD7656. After the BUSY signal has gone
low to indicate the conversion is complete the user can begin to
read the data from the two devices. Figure 13 shows the serial
timing diagram when operating two AD7658/AD7657/AD7656
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