参数资料
型号: AFE7222EVM
厂商: Texas Instruments
文件页数: 88/106页
文件大小: 0K
描述: EVAL MODULE FOR AFE7222
标准包装: 1
主要目的: 接口,模拟前端(AFE)
嵌入式:
已用 IC / 零件: AFE7222
已供物品:
其它名称: 296-30300
AFE7222EVM-ND
ADC_DCLKOUT
ADCDATA <11:0>
A
B
A
B
A
B
ADC_DCLKOUT
ADCDATA <11:0>
A
B
A
th
tsu
th
tsu
tCLK
SLOS711B – NOVEMBER 2011 – REVISED MARCH 2012
Table 10-2 shows the maximum frequency of operation of various clocks of AFE7225 in CMOS interface
mode (by default after reset, AFE722x operates in CMOS interface mode for both RX and TX path).
Table 10-2. Maximum Interface Rates in CMOS Mode
RX PATH
Decimation Factor
Low Power CMOS Mode
Max ADC Sampling Clock
(register bits
Max ADC_DCLKOUT
Max Parallel Output Data Rate
(register bit
(ADC_CLK(1))
RX_DEC_FIL_EN,
MHz
Mbps, per pin
MODE_LP_CMOS)
MHz
RX_DEC_FIL_EN_SRC)
1
105
210
Disabled (default)
105
2
52.5
105
1
40
80
Enabled
40
2
20
40
TX PATH
Interpolation Factor
Max DAC Output Clock
(register bits
Max DAC_DCLKIN
Max Parallel Input Data Rate
(DAC_CLK(1))
TX_INT_MODE(1:0),
MHz
Mbps, per pin
MHz
TX_INT_MODE_SRC)
1
130
260
2
130
65
130
4
32.5
65
(1)
ADC_CLK and DAC_CLK are derived from clocks on CLKINP and CLKINN (differential clock, a single-ended clock or two independent
single-ended clocks). See Clocking section for details. For Full-Duplex operation requiring two single-ended clocks, see section Full
10.1 PARALLEL CMOS ADC RX DATA
The 12-bit ADC-A and ADC-B data is interleaved (A then B) into one 12-bit word on pins
ADCDATA0:ADCDATA11 at twice the rate of each pattern with a DDR clock (data transitions on rising
and falling edges). This can be quadrature data or two independent receive channels. Note that in the
default RX CMOS mode, the edges of the ADC_DCLKOUT are aligned in the middle of the data window.
Figure 10-1. RX CMOS Interleaved Output
10.2 TIMING INFORMATION FOR PARALLEL CMOS ADC RX DATA
tCLK = Time period of ADC output data clock (same as time period of ADC sampling clock when decimation is set to
1).
Figure 10-2. RX CMOS Output Timing
82
DIGITAL INTERFACE
Copyright 2011–2012, Texas Instruments Incorporated
Product Folder Link(s): AFE7222 AFE7225
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