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參數(shù)資料
| 型號(hào)： | AD9761-EBZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 7/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVAL FOR AD9761 |
| 產(chǎn)品培訓(xùn)模塊： | DAC Architectures |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | TxDAC® |
| DAC 的數(shù)量： | 2 |
| 位數(shù)： | 10 |
| 采樣率（每秒）： | 40M |
| 數(shù)據(jù)接口： | 并聯(lián) |
| 設(shè)置時(shí)間： | 35ns |
| DAC 型： | 電流 |
| 工作溫度： | -40°C ~ 85°C |
| 已供物品： | 板 |
| 已用 IC / 零件： | AD9761 |
| 相關(guān)產(chǎn)品： | AD9761ARSZRL-ND - IC DAC 10BIT DUAL 40MSPS 28-SSOP AD9761ARSZ-ND - IC DAC 10BIT DUAL 40MSPS 28-SSOP AD9761ARSRL-ND - IC DAC 10BIT DUAL 40MSPS 28-SSOP AD9761ARS-ND - IC DAC 10BIT DUAL 40MSPS 28-SSOP |
AD9761
–14–
AD9761
–15–
5MSPS
RATIO (fOUT/fCLK)
40
30
0.05
0.15
40MSPS
20
0
0.10
20MSPS
10MSPS
10
0
I DVDD
(mA
)
0.20
2.5MSPS
5
35
25
15
Figure 16. IDVDD vs. Ratio @ DVDD = 3 V
APPLYING THE AD9761
Output Configurations
The following sections illustrate some typical output configu-
rations for the AD9761. Unless otherwise noted, it is assumed
that IOUTFS is set to a nominal 10 mA. For applications requir-
ing the optimum dynamic performance, a differential output
configuration is suggested. A differential output configuration
may consist of either an RF transformer or a differential op amp
configuration.The transformer configuration provides the
optimum high frequency performance and is recommended
for any application allowing for ac coupling. The differential
op amp configuration is suitable for applications requiring dc
coupling, a bipolar output, signal gain, and/or level shifting.
A single-ended output is suitable for applications requiring
a unipolar voltage output. A positive unipolar output voltage
will result if IOUTA and/or IOUTB is connected to an
appropriately sized load resistor, RLOAD, referred to ACOM.
This configuration may be more suitable for a single-supply
system requiring a dc-coupled, ground referred output volt-
age. Alternatively, an amplifier could be configured as an I-V
converter, thus converting IOUTA or IOUTB into a negative
unipolar voltage. This configuration provides the best dc
linearity since IOUTA or IOUTB is maintained at a virtual
ground.
Differential Coupling Using a Transformer
An RF transformer can be used to perform a differential-
to-single-ended signal conversion as shown in Figure 17. A
differentially coupled transformer output provides the optimum
distortion performance for output signals whose spectral
content lies within the transformer’s pass band. An RF
transformer such as the Mini-Circuits T1-1T provides
excellent rejection of common-mode distortion (i.e., even-order
harmonics) and noise over a wide frequency range. It also
provides electrical isolation and the ability to deliver twice
the power to the load.Transformers with different impedance
ratios may also be used for impedance matching purposes.
Note that the transformer provides ac coupling only.
OPTIONAL
RDIFF
RLOAD
MINI-CIRCUITS
T1-1T
IOUTA
IOUTB
AD9761
Figure 17. Differential Output Using aTransformer
The center tap on the primary side of the transformer must
be connected to ACOM to provide the necessary dc current
path for both IOUTA and IOUTB. The complementary voltages
appearing at IOUTA and IOUTB (i.e., VOUTA and VOUTB)
swing symmetrically around ACOM and should be maintained
with the specified output compliance range of the AD9761.
A differential resistor, RDIFF, may be inserted in applications
in which the output of the transformer is connected to the
load, RLOAD, via a passive reconstruction filter or cable
requiring double termination. RDIFF is determined by the
transformer’s impedance ratio and provides the proper
source termination, which results in a low VSWR. Note
that approximately half the signal power will be dissipated
across RDIFF.
Differential Coupling Using an Op Amp
An op amp can also be used to perform a differential
to single-ended conversion as shown in Figure 18. The
AD9761 is configured with two equal load resistors, RLOAD,
of 50 . The differential voltage developed across IOUTA
and IOUTB is converted to a single-ended signal via the
differential op amp configuration. An optional capacitor
can be installed across IOUTA and IOUTB forming a real
pole in a low-pass filter. The addition of this capacitor also
enhances the op amp’s distortion performance by prevent-
ing the DAC’s high slewing output from overloading the op
amp’s input.
COPT
200
500
IOUTA
IOUTB
AD9761
RLOAD
50
200
AD8042
500
RLOAD
50
Figure 18. DC Differential Coupling Using an Op Amp
The common-mode rejection of this configuration is typically
determined by the resistor matching. In this circuit, the
differential op amp circuit using the AD8042 is configured
to provide some additional signal gain. The op amp must
operate from a dual supply since its output is approximately
±1.0 V. A high speed amplifier capable of preserving the
differential performance of the AD9761 while meeting other
system level objectives (i.e., cost, power) should be selected.
The op amp’s differential gain, gain setting resistor values,
and full-scale output swing capabilities should all be consid-
ered when optimizing this circuit.
REV. C
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