DATA SHEET • SKY73126-31 VCO/SYNTHESIZER

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

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February 24, 2010 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201112C

Table 6. Word 2: DPLL Control Hold Register

Parameter

Function

State Description

Recommended

Operational Value

(Binary)

Default Value

(Binary)

wd_3, wd_2, wd_1,

wd_0

Address bits [3:0]. Must be set to

0010b (see Table 3).

0010

0010

dpll_ctrl

DPLL control [21:4]

Reserved

–

00000000000

0000000

test_mux

Lock detect and diagnostic output

select [24:22]

Note: Logic output is via LD signal

(pin 12)

Bits [24:22]:

0 0 0 = lock detect output or vendor ID read-back

0 0 1 = R-divider output

0 1 0 = N-divider output

0 1 1 = capacitor overflow

1 0 0 = capacitor underflow

1 0 1 = VCO high comparator

1 1 0 = VCO low comparator

1 1 1 = DPLL test

Note: When test_mux = 000, the vendor ID is output to

pin 12 if vendor ID read-back has been initialized.

Otherwise, when test_mux = 000, pin 12 outputs the

lock detect signal.

000

000

sd_sel

Internal operating voltage control bit

for the synthesizer [25]

Note: this bit needs to be programmed

together with Word 1, bit [11], and

Word 1, bit [12].

See nr_sel parameter (Word 1, bit [11])

0

0

rsvd

Reserved [31:26]

Reserved

000000

000000

Table 7. Word 3: Frequency Control Hold Register (1 of 2)

Parameter

Function

State Description

Recommended

Operational Value

(Binary)

Default Value

(Binary)

wd_3, wd_2, wd_1,

wd_0

Address bits [3:0]. Must be set to

0011b (see Table 3).

0011

0011

dpll_en

VCO auto tuning enable flag [4]

Bit [4]:

0 = disable VCO auto tuning

1 = enable VCO auto tuning

Refer to Figure 7

0

ndiv

N-divider/prescaler mode for control

of M and A counters [20:5]

Bits [20:5]:

For 8/9 prescaler mode:

bits [7:5]

= A-counter bits [2:0] (bit [3] = 0)

bits [19:8] = M-counter bits [11:0]

bit [20]

= 0

For 16/17 prescaler mode:

bits [8:5]

= A-counter bits [3:0]

bits [20:9] = M-counter bits [11:0]

Application

dependent

00000000000

00000