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參數(shù)資料
| 型號(hào)： | MAX5875 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Quadruple Line Driver 14-CDIP -55 to 125 |
| 中文描述： | 16位、200Msps、高動(dòng)態(tài)性能、雙路DAC，CMOS輸入 |
| 文件頁數(shù)： | 15/18頁 |
| 文件大?。?/td> | 511K |
| 代理商： | MAX5875 |
M
16-Bit, 250Msps, High-Dynamic-Performance,
Dual DAC with LVDS Inputs
______________________________________________________________________________________
15
Differential-to-Single-Ended Conversion
Using a Wideband RF Transformer
Use a pair of transformers (Figure 7) or a differential
amplifier configuration to convert the differential voltage
existing between OUTIP/OUTQP and OUTIN/OUTQN to
a single-ended voltage. Optimize the dynamic perfor-
mance by using a differential transformer-coupled out-
put and limit the output power to <0dBm full scale. Pay
close attention to the transformer core saturation char-
acteristics when selecting a transformer for the
MAX5878. Transformer core saturation can introduce
strong 2nd-order harmonic distortion especially at low
output frequencies and high signal amplitudes. For best
results, center tap the transformer to ground. When not
using a transformer, terminate each DAC output to
ground with a 25
resistor. Additionally, place a 50
resistor between the outputs (Figure 8).
For a single-ended unipolar output, select OUTIP
(OUTQP) as the output and ground OUTIN (OUTQN) to
GND. Driving the MAX5878 single-ended is not recom-
mended since additional noise and distortion will
be added.
The distortion performance of the DAC depends on the
load impedance. The MAX5878 is optimized for 50
differential double termination. It can be used with a
transformer output as shown in Figure 7 or just one 25
resistor from each output to ground and one 50
resis-
tor between the outputs (Figure 8). This produces a full-
scale output power of up to -2dBm, depending on the
output current setting. Higher termination impedance
can be used at the cost of degraded distortion perfor-
mance and increased output noise voltage.
Grounding, Bypassing, and Power-
Supply Considerations
Grounding and power-supply decoupling can strongly
influence the MAX5878 performance. Unwanted digital
crosstalk couples through the input, reference, power
supply, and ground connections, and affects dynamic
performance. High-speed, high-frequency applications
require closely followed proper grounding and power-
supply decoupling. These techniques reduce EMI and
internal crosstalk that can significantly affect the
MAX5878 dynamic performance.
Use a multilayer printed circuit (PC) board with sepa-
rate ground and power-supply planes. Run high-speed
signals on lines directly above the ground plane. Keep
digital signals as far away from sensitive analog inputs
and outputs, reference input sense lines, common-
mode input, and clock inputs as practical. Use a sym-
metric design of clock input and the analog output lines
to minimize 2nd-order harmonic distortion components,
thus optimizing the DAC’s dynamic performance. Keep
digital signal paths short and run lengths matched to
avoid propagation delay and data skew mismatches.
The MAX5878 requires five separate power-supply
inputs for analog (AV
DD1.8
and AV
DD3.3
), digital
(DV
DD1.8
and DV
DD3.3
), and clock (AV
CLK
) circuitry. All
power-supply pins must be connected to their proper
supply. Decouple each AV
DD
, DV
DD
, and AV
CLK
input
pin with a separate 0.1μF capacitor as close to the
device as possible with the shortest possible connec-
tion to the ground plane (Figure 9). Minimize the analog
and digital load capacitances for optimized operation.
Decouple all three power-supply voltages at the point
they enter the PC board with tantalum or electrolytic
MAX5878
16
OUTIP/OUTQP
OUTIN/OUTQN
DATA15–DATA0
WIDEBAND RF TRANSFORMER T2 PERFORMS THE
DIFFERENTIAL-TO-SINGLE-ENDED CONVERSION
T1, 1:1
T2, 1:1
GND
50
100
50
V
OUT
, SINGLE-ENDED
Figure 7. Differential-to-Single-Ended Conversion Using a Wideband RF Transformer
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX5876 | Quadruple Line Driver 14-CFP -55 to 125 |
| MAX5877 | Replaced by SN55189A : Quadruple Line Receiver 14-CDIP -55 to 125 |
| MAX5878 | 16-Bit, 250Msps, High-Dynamic-Performance, Dual DAC with LVDS Inputs |
| MAX5878EGK | 16-Bit, 250Msps, High-Dynamic-Performance, Dual DAC with LVDS Inputs |
| MAX5887EGK | 3.3V, 14-Bit, 500Msps High Dynamic Performance DAC with Differential LVDS Inputs |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX5875EGK | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX5875EGK+D | 功能描述:數(shù)模轉(zhuǎn)換器- DAC 16-Bit 2Ch 200Msps DAC 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(shí)間:1 us 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
| MAX5875EGK+TD | 功能描述:數(shù)模轉(zhuǎn)換器- DAC 16-Bit 2Ch 200Msps DAC 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(shí)間:1 us 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
| MAX5875EGK-D | 功能描述:數(shù)模轉(zhuǎn)換器- DAC 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(shí)間:1 us 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
| MAX5875EGK-TD | 功能描述:數(shù)模轉(zhuǎn)換器- DAC 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(shí)間:1 us 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
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