参数资料
型号: AFE7222IRGCT
厂商: Texas Instruments
文件页数: 101/106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
C
M
O
S
RX DATA
ADCDATA
C
M
O
S
RX CLK
ADC_DCLKOUT
C
M
O
S
TX DATA
DACDATA
C
M
O
S
TX CLK
DAC_DCLKIN
ADC
DAC
TO FPGA
REG_OEZ_CMOS_DAT
REG_OEZ_CMOS_CLK
REG_PDN_RX
REG_PDN_TX
AFE7222/ 7225
SLOS711B – NOVEMBER 2011 – REVISED MARCH 2012
Figure 10-21. I/O Interface
To enable the TX in Half Duplex mode, set:
REG_PDN_RX=1, REG_OEZ_CMOS_DAT=1, REG_OEZ_CMOS_CLK=1, and drive the DACDATA and
DAC_DCLKIN pins as TX input pins.
To enable the RX in Half Duplex mode, set:
REG_PDN_TX=1 and receive data and clock from the RX on the same bus.
For a pin control to be able to toggle between RX half duplex and TX half duplex modes, set bit
REG_HALF_DUPLEX_THRU_PIN. When this mode is set, the PDN pin serves as a toggle pin – when the
PDN pin is high, the device operates in Half duplex RX mode and when the PDN pin is low, the device
operates in Half duplex TX mode.
Note that half duplex mode through a common I/O interface and the full duplex mode will require different
board configurations, since in the former mode, the I/O bus is shared.
11 QUICK GUIDE
Supplies:
We recommend driving the Device with 3 supplies :
3V supply – Tie pins 11, 14, 17, 22 to this supply
1.8V analog supply – Tie pins 1, 4, 7, 10, 19, 25, 62, 64 to this supply
1.8V digital supply – Tie pins 32, 41, 49 to this supply
Power up sequence:
Power on the 3V and 1.8V supplies in any sequence
Apply a high going pulse on RESET of minimum width 100 ns to reset the internal registers of the device.
Software RESET:
In addition to the hardware RESET pin, the device also has a software RESET bit. This is a self-clearing
bit, so it needs to be only asserted whenever the device needs to be reset. The software RESET can be
applied by programming register address 000, Data 02.
94
QUICK GUIDE
Copyright 2011–2012, Texas Instruments Incorporated
Product Folder Link(s): AFE7222 AFE7225
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