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參數(shù)資料
| 型號(hào)： | ISL5314EVAL2 |
| 廠商： | Intersil Corporation |
| 元件分類： | XO, clock |
| 英文描述： | Direct Digital Synthesizer |
| 中文描述： | 直接數(shù)字頻率合成器 |
| 文件頁數(shù)： | 14/16頁 |
| 文件大?。?/td> | 809K |
| 代理商： | ISL5314EVAL2 |
14
Pin Descriptions
PIN NO.
PIN NAME
TYPE
PIN DESCRIPTION
44-48, 1-3
C(7:0)
Input
8-bit processor input data bus. C7 is the MSB. Data is written to the control register selected on
A(3:0) on the rising edge of WR when WE is active.
42
WR
Input
Write clock for the processor interface. Parallel data is clocked into the chip on the rising edge of
WR.
40
WE
Input
Write enable. Active low. WE must be active when writing data to the chip.
35-38
A(3:0)
Input
Processor interface address bus. These pins select the destination register for data on the C(7:0)
bus. A3 is the MSB.
6
CLK
Clock
NCO and DAC clock. The phase accumulator and DAC output update on the rising edge of this
clock. CLK can be asynchronous to the WR clock.
8
RESET
Input
Reset. Active low. Resets control registers to their default states (see register description table)
and zeroes the feedback in the phase accumulator. UPDATE must be low for Reset to occur.
30
SCLK
Input
Serial clock. Polarity is programmable. See control word 12. May be asynchronous to CLK. If not
used, connect to DGND.
27
SDATA
Input
Serial data. See control word 12. If not used, connect to DGND.
32
SSYNC
Input
Serial sync. See control word 12. If not used, connect to DGND.
9
UPDATE
Input
Active low. Updates the active control registers only. It has no effect on the ENOFR or PH(1:0)
pins. This pin is provided for updating an entire frequency word at once rather than byte by byte.
33, 34
PH(1:0)
Input
Phase offset bits. The phase of the output is shifted. If not used, these pins should be grounded.
00 – 0 degrees reference
01 – 90 degrees shift
10 – 180 degrees shift
11 – 270 degrees shift
4
ENOFR
Input
Enable offset frequency. Active high. When high, the offset frequency bus is enabled to the phase
accumulator. When low, the offset frequency bus is zeroed. This pin does not affect the contents
of the offset frequency registers. If not used, the pin should be grounded.
10
COMPOUT
Output
Comparator output.
11
REFLO
Input
Connect to analog ground to enable the DAC’s internal 1.2V reference or connect to AV
DD
to
disable the internal reference.
12
REFIO
Input
Reference voltage input for the DAC if internal reference is disabled. Recommend the use of a
0.1
μ
F cap to ground from the REFIO pin when a DC reference voltage is used.
13
FSADJ
Full scale current adjust for the DAC. Use a resistor to ground (R
SET
) to adjust the full scale
output current. Full Scale Output Current = 32 x V
FSADJ
/R
SET
, where V
FSADJ
equals the
reference voltage.
14
COMP1
Noise reduction for the DAC. Connect a 0.1
μ
F cap to AV
DD
plane.
19
COMP2
Noise reduction for the DAC. Connect a 0.1
μ
F cap to AGND plane.
18
IOUTA
Output
DAC current output.
17
IOUTB
Output
DAC complementary current output.
20
AV
DD
Power
Analog supply voltage.
15, 16, 21, 24
AGND
GND
Analog ground.
7, 26, 31, 43
DV
DD
Power
Digital supply voltage.
5, 25, 28, 29, 41
DGND
GND
Digital ground.
22, 23
IN+, IN-
Input
Comparator inputs. To power down the comparator, connect both of these pins to the analog
power supply. This will conserve ~4mA of current.
39
NC
NC
No connect.
ISL5314
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