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參數資料
| 型號： | AD9834 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Low Power, +2.3 V to +5.5 V, 50 MHz Complete DDS |
| 中文描述： | 低功耗，2.3 V至5.5 V，50 MHz的完整的DDS |
| 文件頁數： | 14/20頁 |
| 文件大小： | 236K |
| 代理商： | AD9834 |
AD9834
APPLICATIONS
Because of the various output options available from the
part, the AD9834 can be configured to suit a wide variety
of applications.
One of the areas where the AD9834 is suitable is in modu-
lation applications. The part can be used to perform
simple modulation such as FSK. More complex modula-
tion schemes such as GMSK and QPSK can also be
implemented using the AD9834.
In an FSK application, the two frequency registers of the
AD9834 are loaded with different values; one frequency
will represent the space frequency while the other will
represent the mark frequency. The digital data stream is
fed to the FSELECT pin which will cause the AD9834 to
modulate the carrier frequency between the two values.
The AD9834 has two phase registers; this enables the part
to perform PSK. With phase shift keying, the carrier fre-
quency is phase shifted, the phase being altered by an
amount which is related to the bit stream being input to
the modulator.
The AD9834 is also suitable for signal generator applica-
tions. With the on-board comparator, the device can be
used to generate a square wave.
With its low current consumption, the part is suitable for
applications in which it can be used as a local oscillator.
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14
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REV PrM
PRELIMINARY TECHNICAL DATA
Comparator Output:
The AD9834 has an on-board
comparator. To connect this comparator to the SIGN
BIT OUT pin, the SIGNPIB (D4) control bit must be set
to 1. After filtering the sinusoidal output from the DAC,
the waveform can be applied to the comparator to generate
a square waveform.
MSB from the NCO:
The MSB from the NCO can be
output from the AD9834. By setting the SIGNPIB (D4)
control bit to 0, the MSB of the DAC data is available at
the SIGN BIT OUT pin. This is useful as a coarse clock
source. This square wave can also be divided by 2 before
being output. The bit DIV2 (D3) in the control register
controls the frequency of this output from the SIGN BIT
OUT pin.
Table 13: Various Outputs from SIGN BIT OUT
OPBITEN MODE
Bit
SIGNPIB DIV2
Bit
SIGN BIT OUT
Pin
Bit
Bit
0
1
1
1
1
1
X
0
0
0
0
1
X
0
0
1
1
X
X
0
1
0
1
X
High Impedance
DAC data MSB / 2
DAC data MSB
Reserved
Comparator Output
Reserved
The IOUT/IOUTB Pins
The analog outputs from the AD9834 are available from
the IOUT/IOUTB pins. The available outputs are a
sinuoidal output or a ramp output.
Sinusoidal Output:
The SIN ROM is used to convert the
phase information from the frequency and phase registers
into amplitude information which results in a sinusoidal
signal at the output. To have a sinusoidal output from the
IOUT/IOUTB pins set the bt MODE (D1) = 1.
Up/Down Ramp Output:
The SIN ROM can be bypassed
so that the truncated digital output from the NCO is sent
to the DAC. In this case, the output is no longer sinusoi-
dal. The DAC will produce a ramp up/down function. To
have a ramp output from the IOUT/IOUTB pins set the
bt MODE (D1) = 0.
Note that the SLEEP pin/SLEEP12 bit must be 0 (i.e. the
DAC is enabled) when using these pins.
Table 14: Various Outputs from IOUT/IOUTB
OPBITEN Bit
MODE Bit
IOUT / IOUTB Pins
0
0
1
1
0
1
0
1
Sinusoid
Up/Down Ramp
Sinusoid
Reserved
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相關代理商/技術參數 |
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| AD9834_10 | 制造商:AD 制造商全稱:Analog Devices 功能描述:20 mW Power, 2.3 V to 5.5 V,75 MHz Complete DDS |
| AD9834BRU | 功能描述:IC DDS W/COMP 2.3V 50MHZ 20TSSOP RoHS:否 類別:集成電路 (IC) >> 接口 - 直接數字合成 (DDS) 系列:- 產品變化通告:Product Discontinuance 27/Oct/2011 標準包裝:2,500 系列:- 分辨率（位）:10 b 主 fclk:25MHz 調節字寬（位）:32 b 電源電壓:2.97 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-TSSOP（0.173"，4.40mm 寬） 供應商設備封裝:16-TSSOP 包裝:帶卷 (TR) |
| AD9834BRU-REEL | 功能描述:IC DDS 10BIT 50MHZ LP 20-TSSOP RoHS:否 類別:集成電路 (IC) >> 接口 - 直接數字合成 (DDS) 系列:- 產品變化通告:Product Discontinuance 27/Oct/2011 標準包裝:2,500 系列:- 分辨率（位）:10 b 主 fclk:25MHz 調節字寬（位）:32 b 電源電壓:2.97 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-TSSOP（0.173"，4.40mm 寬） 供應商設備封裝:16-TSSOP 包裝:帶卷 (TR) |
| AD9834BRU-REEL7 | 功能描述:IC DDS 10BIT 50MHZ LP 20-TSSOP RoHS:否 類別:集成電路 (IC) >> 接口 - 直接數字合成 (DDS) 系列:- 產品變化通告:Product Discontinuance 27/Oct/2011 標準包裝:2,500 系列:- 分辨率（位）:10 b 主 fclk:25MHz 調節字寬（位）:32 b 電源電壓:2.97 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-TSSOP（0.173"，4.40mm 寬） 供應商設備封裝:16-TSSOP 包裝:帶卷 (TR) |
| AD9834BRUZ | 功能描述:IC DDS 10BIT 50MHZ LP 20-TSSOP RoHS:是 類別:集成電路 (IC) >> 接口 - 直接數字合成 (DDS) 系列:- 產品變化通告:Product Discontinuance 27/Oct/2011 標準包裝:2,500 系列:- 分辨率（位）:10 b 主 fclk:25MHz 調節字寬（位）:32 b 電源電壓:2.97 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-TSSOP（0.173"，4.40mm 寬） 供應商設備封裝:16-TSSOP 包裝:帶卷 (TR) |
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