User`s guide

Si47xx-EVB
102 Rev. 0.8
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
attenuators, respectively.
0–28
(AM Component
2.E.5)
Si4740/41/42/43/
44/45
AGC Frontend
Min. Gain Index
Sets minimum gain index. For Si4743EVB, 19 is rec-
ommended.
0–28
(AM Component
2.E.5)
Si4740/41/42/43/
44/45
AGC Index
Sets gain index when "AGC Override" is On.
0–
37+ATTN_BACKU
P
All
AGC Override
When "Off", AGC is enabled. When "On", AGC is dis-
abled and gain index is forced to "AGC Index"
ON/OFF All
AGC Release
Rate
Sets the AGC release rate. Larger values provide
slower release and smaller values provide faster
release.
4–248 Si4740/41/42/43/
44/45
External
Attenuator Select
For Si474x-EVB daughtercard versions >
1.2. When
using an antenna, set this property to PASSIVE. If
you are connecting a signal generator directly, set
this to ACTIVE.
ACTIVE, PASSIVE Si4740/41/42/43/
44/45
Auto Volume
Cont. Max Gain
(dB)
Sets the maximum gain allowed for automatic volume
control.
6.02–90.3 dB Si473x-C40 and
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
Filter
ON enables high pass filter to filter out the 50/60 Hz
tone.
ON/OFF Si473x-C40 and
later, Si4740/41/42/
43/44/45
Reference Clock
Frequency (Hz)
This field is used to specify the frequency of the refer-
ence clock. The Reference clock frequency divided
by the pre-scalar must be in the range of 31.130 to
34.406 kHz.
31130–34406 Hz All
Reference Clock
Prescaler
Reference Clock Pre-scalar divides down RCLK fre-
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.
1–4095 All
Digital DCLK
Falling Edge
ON uses falling edge of DCLK for sampling.
ON, OFF Si4705/06,
Si4731/35/37/39,
Si4730/34/36/38-
D60 and later,
Si4741/43/45,
Si4784/85