ISL5314_05 Datasheet, PDF (1/16 Pages) Intersil Corporation – Direct Digital Synthesizer

®
Data Sheet
July 28, 2005
ISL5314
FN4901.2
Direct Digital Synthesizer
The 14-bit ISL5314 provides a complete Direct Digital
Synthesizer (DDS) system in a single 48-pin LQFP package.
A 48-bit Programmable Carrier NCO (numerically controlled
oscillator) and a high speed 14-bit DAC (digital to analog
converter) are integrated into a stand alone DDS.
The DDS accepts 48-bit center and offset frequency control
information via a parallel processor interface. A 40-bit
frequency tuning word can also be loaded via an asynchronous
serial interface. Modulation control is provided by 3 external
pins. The PH0 and PH1 pins select phase offsets of 0, 90,
180 and 270 degrees, while the ENOFR pin enables or zeros
the offset frequency word to the phase accumulator.
The parallel processor interface has an 8-bit write-only data
input C(7:0), a 4-bit address A(3:0) bus, a Write Strobe
(WR), and a Write Enable (WE). The processor can update
all registers simultaneously by loading a set of master
registers, then transfer all master registers to the slave
registers by asserting the UPDATE pin.
Ordering Information
PART # TEMP. RANGE (°C) PACKAGE PKG. DWG. #
ISL5314IN
-40 to 85
48 LQFP Q48.7x7A
ISL5314INZ
(See Note)
-40 to 85
48 LQFP Q48.7x7A
(Pb-free)
ISL5314EVAL2
25
Evaluation Board
NOTE: Intersil Pb-free plus anneal products employ special Pb-free material
sets; molding compounds/die attach materials and 100% matte tin plate
termination finish, which are RoHS compliant and compatible with both SnPb
and Pb-free soldering operations. Intersil Pb-free products are MSL classified
at Pb-free peak reflow temperatures that meet or exceed the Pb-free
requirements of IPC/JEDEC J STD-020.
Block Diagram
C(7:0)
A(3:0)
WR
WE
UPDATE
SDATA
SSYNC
SCLK
ENOFR
PH(1:0)
RESET
CLK
PHASE
ACCUM.
∑
SINE
WAVE
ROM
-
+
14 BIT
DAC
INT
REF
IN-
IN+
COMP1
COMP2
IOUTA
IOUTB
REFIO
REFLO
Features
• 125MSPS output sample rate with 5V digital supply
• 100MSPS output sample rate with 3.3V digital supply
• 14-bit digital-to-analog (DAC) with internal reference
• Parallel control interface for fast tuning (50MSPS control
register write rate) and serial control interface
• 48-bit programmable frequency control
• Offset frequency register and enable pin for fast FSK
• Small 48-pin LQFP packaging
• Pb-Free plus anneal available (RoHS compliant)
Applications
• Programmable local oscillator
• FSK, PSK modulation
• Direct digital synthesis
• Clock generation
Pinout
48-PIN LQFP (Q48.7X7A)
TOP VIEW
C2
C1
C0
ENOFR
DGND
CLK
DVDD
RESET
UPDATE
COMPOUT
REFLO
REFIO
48 47 46 45 44 43 42 41 40 39 38 37
1
36
2
35
3
34
4
33
5
32
6
ISL5314
31
7
30
8
29
9
28
10
27
11
26
1213
14
15
16
17
18
19
20
21
22
23
25
24
A2
A3
PH0
PH1
SSYNC
DVDD
SCLK
DGND
DGND
SDATA
DVDD
DGND
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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