参数资料
型号: AFE7222IRGCT
厂商: Texas Instruments
文件页数: 78/106页
文件大小: 0K
描述: IC AFE 12BIT 65/130MSPS 64VQFN
标准包装: 1
位数: 12
通道数: 4
功率(瓦特): 610mW
电压 - 电源,模拟: 2.85 V ~ 3.6 V
电压 - 电源,数字: 1.7 V ~ 1.9 V
封装/外壳: 64-VFQFN 裸露焊盘
供应商设备封装: 64-VQFN 裸露焊盘(9x9)
包装: 标准包装
其它名称: 296-30113-6
PWR_OP_I (57:0)
PWR_OP_Q (57:0)
INTGR_CNT(20:0)
SYNC_CNT(8:0)
INTRV_CNT(20:0)
I
Q
0
Power Meter 1
Power Meter 2
Complex mode
SLOS711B – NOVEMBER 2011 – REVISED MARCH 2012
Figure 9-4. Fine Power Meter
Power in the fine power meter is calculated by squaring each I (I and Q for complex inputs) sample,
summing, and then integrating the summed-squared results into a 58 bit accumulator over a
programmable integration period.
The integration period is programmed into the 21 bit counter, in 8 sample increments. The power stored in
the 58-bit register is:
Power = [ (I*I) x (Nx8 + 3) ] for real inputs where N is the integration count.
Power = [ (I*I + Q*Q) x (Nx8 + 3) ] for complex inputs where N is the integration count.
The power meter operation can be optionally synced. If power meter syncing is enabled, it waits for a
programmable number of cycles after a valid sync, and then starts computation. If syncing is disabled, it
starts computation as soon as the power meter is enabled. Once the computation interval is completed,
the computed power is written to a set of serial interface registers, and the next computation interval
begins. The contents of these registers can be read out serially through SDOUT.
The process begins with a sync event starting the 9 bit delay counter. After (8xsync_delay + 4) samples,
the integration interval is started. Integration continues until the integration count is met, at which point the
58 bit integrator results are transferred to the read only register. A new measurement period will start at
the end of the interval period.
A more detailed diagram of the power meter is shown below (the I and Q are represented as 16-bit
numbers).
Copyright 2011–2012, Texas Instruments Incorporated
APPLICATION INFORMATION
73
Product Folder Link(s): AFE7222 AFE7225
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