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參數(shù)資料
| 型號： | AD9913 |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | XO, clock |
| 英文描述： | Low Power 250 MSPS 10-Bit DAC 1.8 V CMOS Direct Digital Synthesizer |
| 中文描述： | 低功耗250 MSPS的10位DAC 1.8伏CMOS直接數(shù)字頻率合成器 |
| 文件頁數(shù)： | 14/32頁 |
| 文件大小： | 473K |
| 代理商： | AD9913 |
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AD9913
MODES OF OPERATION
The AD9913 operates in four modes:
Single tone
Direct switch
Programmable modulus
Linear sweep
Rev. 0 | Page 14 of 32
The modes relate to the data source used to supply the DDS
with its signal control parameters: frequency, phase, or ampli-
tude. The partitioning of the data into different combinations
of frequency, phase, and amplitude is handled automatically
based on the mode and/or specific control bits.
SINGLE TONE MODE
Single tone mode is the default operational mode and is active
when both the direct switch mode bit and the auxiliary
accumulator enable bit are not set. This mode outputs a single
frequency as programmed by the user in the frequency tuning
word (FTW) register. A phase offset value is also available in
single tone mode via the POW register.
DIRECT SWITCH MODE
Direct switch mode enables FSK or PSK modulation. This mode
simply selects the frequency or phase value programmed into
the profile registers. Frequency or phase is determined by the
destination bits in CFR1 [13:12]. Direct switch mode is enabled
using the direct switch mode active bit in register CFR1 [16].
Two approaches are designed for switching between profile
registers. The first is programming the internal profile control
bits, CFR1 [22:20], to the desired value and issuing an
IO_UPDATE. The second approach, with higher data
throughput, is achieved by changing the profile control pins
[2:0]. Control bit CFR1 [27] is for selection between the two
approaches. The default state uses the profile pins.
To perform 8-tone FSK or PSK, program the FTW word or
phase offset word in each profile. The internal profile control
bits or the profile pins are used for the FSK or PSK data.
Table 4 shows the relationship between the profile selection pin
or bit approach.
Table 4. Profile Selection
Profile Pins PS [2:0] or CFR1 Bits [22:20]
000
001
010
011
100
101
110
111
Profile Selection
Profile 0
Profile 1
Profile 2
Profile 3
Profile 4
Profile 5
Profile 6
Profile 7
PROGRAMMABLE MODULUS MODE
In programmable modulus mode, the auxiliary accumulator is
used to alter the frequency equation of the DDS core, making it
possible to implement fractions which are not restricted to a
power of 2 in the denominator.
A standard DDS is restricted to powers of 2 as a denominator
because the phase accumulator is a set of bits as wide as the
frequency tuning word. When in programmable modulus
mode, the frequency equation becomes
f
0
= (
FTW
)(
f
S
)/
x
with 0 ≤
FTW
≤ 2
31
f
0
=
f
S
× (1 (
FTW
/
x
)) with 2
31
<
FTW
< 2
32
1
where 0 ≤
x
≤ 2
32
.
When in programmable modulus mode, the auxiliary accumu-
lator is set up to roll over before it reaches full capacity. Every
time it rolls over, an extra LSB value is added to the phase
accumulator. In order to determine the values that must be
programmed in the registers, the user must define the desired
output to sampling clock frequency as a ratio of integers (M/N,
where N must not exceed 2
32
). N should be programmed into
Register 0x06 [63:32].
Register 0x06 [31:0] must be programmed with the FTW which
is the integer portion of ((2
32
×
f
0
)/
f
S
).
Finally, Register 0x07 [31:0] must be programmed with the
modulus step which is the remainder of ((2
32
×
f
0
)/
f
S
).
LINEAR SWEEP MODE
One purpose of linear sweep mode is to provide better
bandwidth containment compared to direct switch mode by
enabling more gradual, user-defined changes between a starting
point (S0) to an endpoint (E0). The auxiliary accumulator
enable bit is located in Register CFR1 [11]. Linear sweep uses
the auxiliary accumulator to sweep frequency or phase from S0
to E0. A frequency or phase sweep is determined by the
destination bits in CFR1 [13:12]. The trigger to initiate the
sweep can be edge or level triggered. This is determined by
Register CFR1 [9]. Note that, in level triggered mode, the sweep
automatically repeats as long as the appropriate profile pin is
held high.
In linear sweep mode, S0 and E0 (upper and lower limits) are
loaded into the linear sweep parameter register (Register 0x06).
If configured for frequency sweep, the resolution is 32-bits. For
phase sweep, the resolution is 14 bits. When sweeping the
phase, the word value must be MSB-aligned; unused bits are
ignored. The profile pins or the internal profile bits trigger and
control the direction (up/down) of the linear sweep for
frequency or phase. Table 5 depicts the direction of the sweep.
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