HSP50307SC 데이터 시트보기 (PDF) - Intersil
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HSP50307SC Datasheet PDF : 9 Pages
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Applications Example
25.6MHz
OSC
HSP50307
+5VDIGITAL
0.1µF
DGND
DATA
SOURCE
+5VANALOG
DGND
0.1µF
1 MCLK
2 TXCLK
CCLK 28
CDATA 27
CONTROL
PROC.
3 TX_EN
C_EN 26
4 TX_DATA
5 RESET
6 DGND
7 AVCC
8 AGND
9 IBBOUT
DVCC 25
RCLK 24
AGND 23
PD_OUT 22
VCO_IN 21
VCO_SET 20
2.048MHz
OSC
2kΩ
100pF
0.01µF
+5VANALOG
6.25kΩ 0.01µF
10 QBBOUT
AVCC 19
11 QBBIN
0.1µF
12 IBBIN
0.1µF
13 DAC_REF
0.1µF
14 VCM_REF
0.1µF
MOD_OUT- 18
MOD_OUT+ 17
AVDD 16
AGND 15
CABLE
37.5Ω 0.1µF TRANSFORMER
RFOUT
37.5Ω 0.1µF
+9VANALOG
0.1µF
AGND
AGND
FIGURE 4. APPLICATIONS EXAMPLE OF THE HSP50307
Figure 4 shows an applications example of the HSP50307.
The MCLK source operates at 25.6MHz, and the RCLK
operates at 2.048MHz. 0.1µF capacitors are connected from
the IBBOUT to IBBIN and the QBBOUT to QBBIN, providing
AC coupling to the Analog Upconverter Section of the
HSP50307.
The control processor sends the 23-bit control word via the
three-wire interface. The data source receives the 256kHz
TXCLK from the HSP50307 and transmits data and enable
signal at the 256kHz rate.
The DAC_REF and VCM_REF are connected to 0.1µF
capacitors to ground. Each of the differential drivers are
loaded with a 37.5Ω resistor and a 0.1µF capacitor. The
37.5Ω resistors provide matching to the 75Ω cable. The
capacitors perform AC coupling. The drive paths are sent to
the cable transformer for data transmissions.
Table 3 shows the general functional specifications for the
applications example shown in Figure 4. It gives an overview
of what is being accomplished but does not specify an exact
carrier frequency or other programmable functions. These
specifications are met given a valid control word combination
and the applications circuit shown in Figure 4. Table 4 sum-
marizes the performance of the applications example shown
in Figure 4. Again, these specifications are met given a valid
programmed mode.
NOTE: The HSP50307 is sensitive to layout. Users
must make sure the input signals do not couple back
into the output signals. The performance of the
HSP50307 is also sensitive to the decoupling
capacitors between 1) QBBOUT and QBBIN and 2)
IBBOUT and IBBIN. The values shown in Figure 4 are
recommended.
6
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