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Si47xx-EVB
Table 26. AM Receiver Property Window Descriptions
Name
Description
Range
Applicable
Devices
AGC Attack Rate Sets the AGC attack rate. Larger values provide
slower attack and smaller values provide faster
attack.
4–248
Si4740/41/42/43/
44/45
AGC Frontend
Attn. Backup
Steps
Sets gain index backup (ATTN_BACKUP) for exter-
nal attenuator. For Si4743EVB, 12 and 20 are recom-
mended for "Passive" and "Active" external
0–28
(AM Component
2.E.5)
Si4740/41/42/43/
44/45
attenuators, respectively.
AGC Frontend
Sets minimum gain index. For Si4743EVB, 19 is rec-
0–28
Si4740/41/42/43/
Min. Gain Index ommended.
(AM Component
2.E.5)
44/45
AGC Index
Sets gain index when "AGC Override" is On.
0–
All
37+ATTN_BACKU
P
AGC Override
AGC Release
Rate
External
When "Off", AGC is enabled. When "On", AGC is dis-
abled and gain index is forced to "AGC Index"
Sets the AGC release rate. Larger values provide
slower release and smaller values provide faster
release.
For Si474x-EVB daughtercard versions > 1.2. When
ON/OFF All
4–248 Si4740/41/42/43/
44/45
ACTIVE, PASSIVE Si4740/41/42/43/
Attenuator Select using an antenna, set this property to PASSIVE. If
you are connecting a signal generator directly, set
this to ACTIVE.
44/45
Auto Volume
Sets the maximum gain allowed for automatic volume
6.02–90.3 dB Si473x-C40 and
Cont. Max Gain control.
(dB)
later, Si474x
De-Emphasis
De-emphasis filter setting allows the user to select
whether to turn on/off the de-emphasis filter.
ON/OFF All
Power Line Noise ON enables high pass filter to filter out the 50/60 Hz
ON/OFF Si473x-C40 and
Filter
tone.
later, Si4740/41/42/
43/44/45
Reference Clock This field is used to specify the frequency of the refer- 31130–34406 Hz All
Frequency (Hz) ence clock. The Reference clock frequency divided
by the pre-scalar must be in the range of 31.130 to
34.406 kHz.
Reference Clock Reference Clock Pre-scalar divides down RCLK fre-
1–4095 All
Prescaler
quency by the value specified in this field. The Refer-
ence clock frequency divided by the pre-scalar must
be in the range of 31.130 to 34.406 kHz.
Digital DCLK
Falling Edge
102
ON uses falling edge of DCLK for sampling.
Rev. 0.8
ON, OFF Si4705/06,
Si4731/35/37/39,
Si4730/34/36/38-
D60 and later,
Si4741/43/45,
Si4784/85
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