参数资料
型号: AFE7222EVM
厂商: Texas Instruments
文件页数: 79/106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
B0108-03
21-Bit
Integration
Counter
Clear
58-Bit
Integrator
58-Bit
Register
9-Bit
Sync Delay
Counter
21-Bit
Interval
Counter
Transfer
Sync
Delay
(in 8 Sample
Increments)
Integration
(in 8 Sample
Increments)
21
9
RMS Power
I
Q
33
32
16
Interval
(in 8 Sample
Increments)
INTRV_CNT(20:0)
INTGR_CNT(20:0)
SYNC_CNT(8:0)
16
32
Interrupt
Q
M
C
O
ff
s
e
t
C
o
a
rs
e
M
ix
e
r
(C
M
IX
)
2
x
In
te
rp
o
la
ti
o
n
T
x
F
IR
2
x
In
te
rp
o
la
ti
o
n
T
x
F
IR
1
In
v
e
rs
e
S
IN
C
Q
M
C
G
a
in
/
P
h
a
s
e
F
in
e
M
ix
e
r
8
d
e
p
F
IF
O
NCO
SYNC
TX A input
(I channel)
TX B input
(Q channel)
TX A output
TX B output
DAC_DCLKIN
DAC_CLK
%1,2,4
DAC_CLK
SLOS711B – NOVEMBER 2011 – REVISED MARCH 2012
Figure 9-5. Power Meter Detailed Diagram
The power meter timing is shown below:
Figure 9-6. Power Meter Timing
9.8
TRANSMIT SIGNAL CHAIN
Figure 9-7. Transmit Signal Chain
9.9
TRANSMIT DAC
The transmit DAC is a current-steering architecture, capable of clock rates up to 250MSPS and output
currents up to 20mA. The DAC is structured as a current sink from the load. The DAC is powered from
AVDD3_DAC, a 3V analog supply. This provides for an output compliance range of AVDD3_DAC ± 0.5V.
To benefit from the full 1V swing available on each DAC output pin, a voltage divider load referenced to a
higher voltage supply, like 5V, is recommended. The current-steering architecture will sink current into the
+ and – DAC outputs. The sum of the current will always be equal to the full-scale current. The full scale
current is set with a resistor (RBIAS) to ground on the BIASJ pin, and will be equal to
74
APPLICATION INFORMATION
Copyright 2011–2012, Texas Instruments Incorporated
Product Folder Link(s): AFE7222 AFE7225
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