参数资料
型号: AD6654BBC
厂商: Analog Devices Inc
文件页数: 50/88页
文件大小: 0K
描述: IC ADC 14BIT W/6CH RSP 256CSPBGA
标准包装: 1
位数: 14
采样率(每秒): 92.16M
数据接口: 串行,并联
转换器数目: 1
功率耗散(最大): 2.5W
电压电源: 模拟和数字
工作温度: -25°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 256-BGA,CSPBGA
供应商设备封装: 256-CSPBGA(17x17)
包装: 托盘
输入数目和类型: 1 个差分,单极
AD6654
Rev. 0 | Page 54 of 88
PCLK
tDPREQ
PxREQ
PxACK
tDPP
Px [15:0]
I[15:0]
Q[15:0]
PxIQ
tDPIQ
PxCH [2:0]
PxCH [2:0] = CHANNEL #
tDPCH
0000 +
GAIN [11:0]
PxGAIN
tDPGAIN
05156-047
Figure 58. Interleaved I/Q Mode with an AGC Gain Word
PxCH [2:0]
PCLK
tDPREQ
PxREQ
PxACK
tDPP
Px [15:0]
I [15:8]
Q [15:8]
PxIQ
tDPIQ
PxCH [2:0] =
AGC NO.
tDPCH
PxGAIN
LOGIC LOW 0
05156-048
Figure 59. Parallel I/Q Mode Without an AGC Gain Word
When an output data sample is available for output from an
AGC, the parallel port initiates the transfer by pulling the
PxREQ signal high. In response, the processor receiving the
data needs to pull the PxACK signal high, acknowledging that it
is ready to receive the signal. In Figure 59, the PxACK is already
pulled high and, therefore, the 8-bit I data and 8-bit Q data are
simultaneously output on the data bus on the next PCLK rising
edge after PxREQ is driven logic high. The PxIQ signal also
goes high to indicate that I/Q data is available on the data bus.
When I/Q data is being output, the channel indicator pins
PxCH[2:0] indicate the data source (AGC number).
Figure 59 is the timing diagram for parallel I/Q mode with the
AGC gain word disabled. Figure 60 is a similar timing diagram
with the AGC gain word enabled. In the PCLK cycle after the
I/Q data, the AGC gain word is output on the data bus, and the
PxGAIN signal is pulled high to indicate that the gain word is
available on the parallel port. During this PCLK cycle, the PxIQ
signal is pulled low to indicate that I/Q data is not available on
the data bus. Therefore, in parallel I/Q mode, a minimum of
two PCLK cycles is required to output one sample of output
data on the parallel port without and with the AGC gain word,
respectively.
The order of data output is dependent on when data arrives at
the port, which is a function of total decimation rate, DRCF/
CRCF decimation phase, and start hold-off values. Priority
order from highest to lowest is, AGC0, AGC1, AGC2, AGC3,
AGC4, and AGC5 for both parallel I/Q and interleaved modes
of output.
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