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參數(shù)資料
| 型號： | CX74038-71 |
| 廠商： | SKYWORKS SOLUTIONS INC |
| 元件分類： | PLL合成/DDS/VCOs |
| 英文描述： | PLL FREQUENCY SYNTHESIZER, 2600 MHz, CQCC24 |
| 封裝： | 4.50 X 3.50 MM, 1 MM HEIGHT, CSP-24 |
| 文件頁數(shù)： | 12/17頁 |
| 文件大小： | 988K |
| 代理商： | CX74038-71 |
Data Sheet I CX74038
provides an active low output to indicate the out-of-lock
condition. When locked, the LD pin is high.
Power Down
The CX74038 supports a number of power-down modes
through the serial interface. Both IF and RF synthesizer blocks
can be powered down, powered up individually, or both
powered up using the EN bits (see the Synthesizer Register
Programming section of this document). The CX74038 is
enabled at power up by default.
Synthesizer Register Programming
IF Integer-N Synthesizer
The N2 17-bit divider ratio is calculated using the following
equation:
IF
N2
FREF
R2
-------------
×
=
As with all integer-N synthesizers, the minimum step size is
related to the divided reference frequency, FREF.
RF Fractional-N Synthesizer
The N1 divider ratio is calculated using the following equation:
RF
FREF
R1
------------- N1Total
×
=
where: N1Total = N1 + 3.5 + FN + ME
FN sets the fractional-N modulo up to 256 modulo, as
calculated by:
FN
D9
1
2
--- D
8
1
2
-----
D7
1
2
3
-----
... + D2
1
2
8
-----
++
+
=
where: Dn represents the bit locations within the register field.
The fractional modulo can be extended up to 221 using the
modulo extender (ME), if required, as shown by the following
equation:
ME
D21
1
2
9
-----
D
20
1
2
10
--------
D
19
1
2
11
--------
... +
++
D9
1
2
21
--------
+
=
Because the way the
Σ modulator is implemented in the
CX74038, the number 3.5 must be added to the division
number to obtain the final division ratio. If the integer field of
the N divider shows a non-integer number, the desired
frequency or the division fraction portion needs to be adjusted.
Sample calculations for two fractional-N applications are
shown in Figure 4.
Electrical and Mechanical Specifications
Signal pin assignments and functional pin descriptions are
specified in Table 1 (20-pin TSSOP) and Table 2 (24-pin CSP).
The CX74038 absolute maximum ratings are provided in
Table 3. The recommended operating conditions are specified
in Table 4. Electrical characteristics are defined in Table 5 and
Table 6 provides the register descriptions.
Figure 5 illustrates the CX74038 serial data word format and
Figure 6 illustrates the CX74038 serial data input timing
diagram.
Package dimensions for the CX74038 are shown in Figure 7
(20-pin TSSOP) and Figure 8 (24-pin 3.5 x 4.5 mm CSP).
Figure 9 provides the tape and reel dimensions for the 20-pin
TSSOP package (for 3.5 x 4.5 mm CSP tape and reel
dimensions, contact a Skyworks’ sales office).
Electrostatic Discharge Information
The CX74038 is an electrostatic sensitive device. Observe
precautions when handling.
4
Skyworks Solutions, Inc., Proprietary and Confidential
MARCH 7, 2003
[781] 376-3000 I FAX [781] 376-3100 I SALES@SKYWORKSINC.COM I WWW.SKYWORKSINC.COM
101075F
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