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參數資料
| 型號： | AD9957BSVZ-REEL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 通信及網絡 |
| 英文描述： | 1 GSPS Quadrature Digital Upconverter with 18-Bit IQ Data Path and 14-Bit DAC |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PQFP100 |
| 封裝： | ROHS COMPLIANT, MS-026AED-HD, TQFP-100 |
| 文件頁數： | 25/60頁 |
| 文件大小： | 840K |
| 代理商： | AD9957BSVZ-REEL |
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AD9957
Rev. 0 | Page 25 of 60
–2.8
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(
FREQUENCY RELATIVE TO DAC SAMPLE RATE
COMPENSATED RESPONSE
Figure 38. DAC Response with Inverse Sinc Compensation
OUTPUT SCALE FACTOR (OSF)
In QDUC and interpolating DAC modes, output amplitude is
controlled using an 8-bit digital multiplier. The 8-bit multiplier
value is called the output scale factor (OSF) and is programmed
via the appropriate control registers. It is available for each of
the eight profiles. The LSB weight is 2
7
, which yields a multiplier
range of 0 to 1.9921875 (2 2
7
). The gain extends to nearly a
factor of 2 to provide a means to overcome the intrinsic loss
through the modulator when operating in the quadrature
modulation mode.
In interpolating DAC mode, the OSF should not be programmed
to exceed unity, as clipping can result. Programming the 8-bit
multiplier to unity gain (0x80) bypasses the stage and reduces
power consumption.
14-BIT DAC
The AD9957 incorporates an integrated 14-bit current-output
DAC. The output current is delivered as a balanced signal using
two outputs. The use of balanced outputs reduces the amount of
common-mode noise at the DAC output, increasing signal-to-
noise ratio. An external resistor (R
SET
) connected between the
DAC_RSET pin and AGND establishes a reference current. The
full-scale output current of the DAC (I
OUT
) is a scaled version of
the reference current (see the Auxiliary DAC section that
follows).
Proper attention should be paid to the load termination to keep
the output voltage within the specified compliance range, as
voltages developed beyond this range cause excessive distortion
and can damage the DAC output circuitry.
Auxiliary DAC
The full-scale output current of the main DAC (I
OUT
) is
controlled by an 8-bit auxiliary DAC. An 8-bit code word stored
in the appropriate register map location sets I
OUT
according to
the following equation:
1
=
96
4
86
R
CODE
I
SET
OUT
(6)
where:
R
SET
is the value of the R
SET
resistor (in ohms).
CODE
is the 8-bit value supplied to the auxiliary DAC (default
is 127).
For example, with R
SET
= 10,000 and CODE = 127, I
OUT
=
20.07 mA.
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相關代理商/技術參數 |
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| AD9957BSVZREEL13 | 制造商:AD 制造商全稱:Analog Devices 功能描述:1 GSPS Quadrature Digital Upconverter w/18-Bit IQ Data Path and 14-Bit DAC |
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| AD9958/PCB | 制造商:Analog Devices 功能描述:Evaluation Board For 2-Channel 500 MSPS DDS With 10-Bit DACs 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Analog Devices 功能描述:IC 10-BIT DAC DDS |
| AD9958/PCBZ | 功能描述:BOARD EVALUATION FOR AD9958 RoHS:是 類別:編程器，開發系統 >> 評估演示板和套件 系列:AgileRF™ 標準包裝:1 系列:PSoC® 主要目的:電源管理，熱管理 嵌入式:- 已用 IC / 零件:- 主要屬性:- 次要屬性:- 已供物品:板，CD，電源 |
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