AD9520-5/PCBZ Analog Devices Inc, AD9520-5/PCBZ Datasheet - Page 67

• Manufacturer Part Number: AD9520-5/PCBZ
• Description: 12/24 Channel Clock Gen 2,0GH
• Manufacturer: Analog Devices Inc

Specifications of AD9520-5/PCBZ

• Design Resources: Synchronizing Multiple AD9910 1 GSPS Direct Digital Synthesizers (CN0121) Phase Coherent FSK Modulator (CN0186)
• Main Purpose: Timing, Clock Generator
• Utilized Ic / Part: AD9520-5
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Secondary Attributes: -
• Embedded: -
• Primary Attributes: -
• Lead Free Status / Rohs Status: Compliant

Reg.
Addr
(Hex) Bit(s) Name
01C
01C
01C
01C
01C
01C
01C
01C
01D
01D
[7]
[6]
[5]
[4]
[3]
[2]
[1]
[0]
[7]
[6]
Disable
switchover
deglitch
Select REF2
Use REF_SEL
pin
Enable
automatic
reference
switchover
Stay on REF2
Enable REF2
Enable REF1
Enable
differential
reference
Enable
Status_EEPROM
at STATUS pin
Enable
XTAL OSC
If Register 0x01C[5] = 0, selects the reference for PLL when in manual; register selected reference control.
Stays on REF2 after switchover.
Description
[4]
1
1
1
1
1
1
1
1
1
1
1
Disables or enables the switchover deglitch circuit.
[7] = 0; enable the switchover deglitch circuit (default).
[7] = 1; disable the switchover deglitch circuit.
[6] = 0; select REF1 (default).
[6] = 1; select REF2.
If Register 0x01C[4] = 0 (manual), sets the method of PLL reference selection.
[5] = 0; use Register 0x01C[6] (default).
[5] = 1; use REF_SEL pin.
Automatic or manual reference switchover. Single-ended reference mode must be selected by
Register 0x01C[0] = 0.
[4] = 0; manual reference switchover (default).
[4] = 1; automatic reference switchover.
Setting this bit also powers on REF1 and REF2 and overrides the settings in Register 0x01C[2:1].
[3] = 0; return to REF1 automatically when REF1 status is good again (default).
[3] = 1; stay on REF2 after switchover. Do not automatically return to REF1.
This bit turns the REF2 power on. This bit is overridden when automatic reference switchover is enabled.
[2] = 0; REF2 power off (default).
[2] = 1; REF2 power on.
This bit turns the REF1 power on. This bit is overridden when automatic reference switchover is enabled.
[1] = 0; REF1 power off (default).
[1] = 1; REF1 power on.
Selects the PLL reference mode, differential or single-ended.
Register 0x01C[2:1] should be cleared when this bit is set.
[0] = 0; single-ended reference mode (default).
[0] = 1; differential reference mode.
Enables the Status_EEPROM signal at the STATUS pin.
[7] = 0; the STATUS pin is controlled by the 0x017[7:2] selection.
[7] = 1; select the Status_EEPROM signal at the STATUS pin. This bit overrides 0x017[7:2] (default).
Enables the maintaining amplifier needed by a crystal oscillator at the PLL reference input.
[6] = 0; crystal oscillator maintaining amplifier disabled (default).
[6] = 1; crystal oscillator maintaining amplifier enabled.
[3]
0
0
0
1
1
1
1
1
1
1
1
[2]
1
1
1
0
0
0
0
1
1
1
1
[1]
0
1
1
0
0
1
1
0
0
1
1
[0]
1
0
1
0
1
0
1
0
1
0
1
Level or
Dynamic
Signal
LVL
LVL
LVL
LVL
LVL
LVL
LVL
LVL
LVL
LVL
LVL
Rev. 0 | Page 67 of 80
Signal at REFMON Pin
Status of selected reference (status of differential reference);
active low.
Status of unselected reference (not available in differential mode);
active low.
Status of REF1 frequency (active low).
Status of REF2 frequency (active low).
(Status of REF1 frequency) AND (status of REF2 frequency).
(DLD) AND (status of selected reference) AND (status of VCO).
Status of CLK frequency (active low).
Selected reference (low = REF2, high = REF1).
DLD; active low.
Holdover active (active low).
LD pin comparator output (active low).
AD9520-5