Rev 1.0 | SC5507A & SC5508A
Hardware Manual
SignalCore, Inc.
24
SC5507A & SC5508A Hardware Manual
Register 0x16 RF_STANDBY (1 Byte)
This register puts the RF1 channel into standby, reducing power consumption.
Bit Type Name
Width Description
[0]
WO
RF1 Standby
1
1 = Puts the RF1 channel into standby. Standby
powers down all circuitry associated with ch1,
thus reducing power consumption.
[7:1]
WO
Unused
7
Set all bits to zero
Register 0x17 REFERENCE_MODE (1 Byte)
This register tells the device to lock to an external reference source.
Bit Type Name
Width Description
[0]
WO
Lock to external
reference source
1
1 = instructs the device to lock to external
source. No attempt will be made unless a
reference source is detected.
[1]
WO
Reference out
select
1
0 = Outputs a 10 MHz signal
1 = Outputs a 100 MHz signal
[7:2]
WO
Unused
6
Set all bits to zero
Register 0x18 REFERENCE_DAC_VALUE (3 Bytes)
This register allows the user to set or adjust the internal 10 MHz TCXO frequency.
Bit Type Name
Width Description
[13:0]
WO
DAC Value
14
14 bit word to set/adjust the internal 10 MHz
TCXO frequency
[23:14]
WO
Unused
10
Set all bits to zero
Register 0x1A DIRECT_ATTEN
This register allows the user to set the LF or HF attenuators manually, thus overriding calibrated values.
Bit Type Name
Width Description
[7:0]
WO
Value
8
0.25 dB LSB for RF attenuators up to 63.75 dB, 1
dB LSB for LF attenuators up to 32 dB.
[8]
WO
Atten select
1
0 = RF attenuators
1 = LF attenuators
