- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄17059 > AD9117-DPG2-EBZ (Analog Devices Inc)IC DAC DUAL 14BIT LO PWR 40LFCSP PDF資料下載
參數(shù)資料
| 型號： | AD9117-DPG2-EBZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 42/52頁 |
| 文件大小： | 0K |
| 描述： | IC DAC DUAL 14BIT LO PWR 40LFCSP |
| 標準包裝： | 1 |
| 系列： | TxDAC® |
| DAC 的數(shù)量： | 2 |
| 位數(shù)： | 14 |
| 采樣率（每秒）： | 125M |
| 數(shù)據(jù)接口： | 串行 |
| DAC 型： | 電流 |
| 工作溫度： | -40°C ~ 85°C |
| 已供物品： | 板 |
| 已用 IC / 零件： | AD9117 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁當前第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁
Data Sheet
AD9114/AD9115/AD9116/AD9117
Rev. C | Page 47 of 52
APPLICATIONS INFORMATION
OUTPUT CONFIGURATIONS
The following sections illustrate some typical output configu-
rations for the AD9114/AD9115/AD9116/AD9117. Unless
otherwise noted, it is assumed that IxOUTFS is set to a nominal
20 mA. For applications requiring the optimum dynamic
performance, a differential output configuration is suggested.
A differential output configuration can consist of either an RF
transformer or a differential op amp configuration. The trans-
former configuration provides the optimum high frequency
performance and is recommended for any application that
allows ac coupling. The differential op amp configuration is
suitable for applications requiring dc coupling, signal gain,
and/or a low output impedance.
A single-ended output is suitable for applications in which low
cost and low power consumption are primary concerns.
DIFFERENTIAL COUPLING USING A TRANSFORMER
An RF transformer can be used to perform a differential-to-
single-ended signal conversion, as shown in Figure 102. The
distortion performance of a transformer typically exceeds
that available from standard op amps, particularly at higher
frequencies. Transformer coupling provides excellent rejection
of common-mode distortion (that is, even-order harmonics)
over a wide frequency range. It also provides electrical isolation
and can deliver voltage gain without adding noise. Transformers
with different impedance ratios can also be used for impedance
matching purposes. The main disadvantages of transformer
coupling are low frequency roll-off, lack of power gain, and
high output impedance.
AD9114/AD9115/
AD9116/AD9117
IOUTN
IOUTP
29
28
OPTIONAL RDIFF
RLOAD
07466-
063
Figure 102. Differential Output Using a Transformer
The center tap on the primary side of the transformer must be
connected to a voltage that keeps the voltages on IOUTP and
IOUTN within the output common-mode voltage range of the
device. Note that the dc component of the DAC output current
is equal to IIOUTFS and flows out of both IOUTP and IOUTN.
The center tap of the transformer should provide a path for this
dc current. In most applications, AGND provides the most
convenient voltage for the transformer center tap. The comple-
mentary voltages appearing at IOUTP and IOUTN (that is,
VIOUTP and VIOUTN) swing symmetrically around AGND and
should be maintained with the specified output compliance
range of the AD9114/AD9115/AD9116/AD9117.
A differential resistor, RDIFF, can be inserted in applications in
which the output of the transformer is connected to the load,
RLOAD, via a passive reconstruction filter or cable. RDIFF, as
reflected by the transformer, is chosen to provide a source
termination that results in a low voltage standing wave ratio
(VSWR). Note that approximately half the signal power is
dissipated across RDIFF.
SINGLE-ENDED BUFFERED OUTPUT USING
AN OP AMP
An op amp, such as the ADA4899-1, can be used to perform a single-
ended current-to-voltage conversion, as shown in Figure 103.
Figure 103 is a simplified schematic. The REFIO pin must be
buffered to keep the load current less than 100 nA. The AD9114/
AD9115/AD9116/AD9117 are configured with a pair of series
resistors, RS, off each output. For best distortion performance, RS
should be set to 0 Ω. The feedback resistor, RFB, determines the
peak-to-peak signal swing by the formula
VOUT = RFB × IFS
The common-mode voltage of the output is determined by the
formula
2
1
FS
FB
B
FB
REF
CM
I
R
V
×
+
×
=
The maximum and minimum voltages out of the amplifier are,
respectively,
+
×
=
B
FB
REF
MAX
R
V
1
VMIN = VMAX IFS × RFB
+5V
AD9114/AD9115/
AD9116/AD9117
IOUTP
IOUTN 29
RFB
VOUT
REFIO 34
28
RS
AVSS 25
CF
C
RS
RB
+
–
ADA4899-1
–5V
07466-
064
Figure 103. Single-Supply, Single-Ended Buffer
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AD9114-DPG2-EBZ | IC DAC DUAL 8BIT LO PWR 40LFCSP |
| AD9115-DPG2-EBZ | IC DAC DUAL 10BIT LO PWR 40LFCSP |
| 0210490184 | CABLE JUMPER 1.25MM .229M 12POS |
| RCM15DCCN-S189 | CONN EDGECARD 30POS R/A .156 SLD |
| CDB4382A | BOARD EVAL FOR CS4382A DAC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD9117-EBZ | 制造商:Analog Devices 功能描述:EVAL BD FOR AD9117, DUAL, 8-/10-/12-/14BIT LOW PWR DGTL-TO-A - Boxed Product (Development Kits) |
| AD9119 | 制造商:AD 制造商全稱:Analog Devices 功能描述:11-/14-Bit, 5.6 GSPS, RF Digital-to-Analog Converter |
| AD91191Z | 制造商:Analog Devices 功能描述: 制造商:Analog Devices 功能描述:450MHZ SHARC PROCESSOR W/5 MBITS RAM - Trays |
| AD9119BBCZ | 功能描述:數(shù)模轉(zhuǎn)換器- DAC IC 11b 5.6 GSPS DAC (AdjRate: 2.8GSPS) RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量:1 DAC 輸出端數(shù)量:1 轉(zhuǎn)換速率:2 MSPs 分辨率:16 bit 接口類型:QSPI, SPI, Serial (3-Wire, Microwire) 穩(wěn)定時間:1 us 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
| AD9119BBCZ | 制造商:Analog Devices 功能描述:DAC 11BIT 5.6GSPS BGA-160 制造商:Analog Devices 功能描述:DAC, 11BIT, 5.6GSPS, BGA-160 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。