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參數(shù)資料
| 型號： | MAX5878EGK+D |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 7/19頁 |
| 文件大小： | 0K |
| 描述： | IC DAC 16BIT DUAL 250MSPS 68-QFN |
| 產(chǎn)品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 30 |
| 設置時間： | 14ns |
| 位數(shù)： | 16 |
| 數(shù)據(jù)接口： | 并聯(lián) |
| 轉(zhuǎn)換器數(shù)目： | 2 |
| 電壓電源： | 模擬和數(shù)字 |
| 功率耗散（最大）： | 331mW |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 68-VFQFN 裸露焊盤 |
| 供應商設備封裝： | 68-QFN 裸露焊盤（10x10） |
| 包裝： | 管件 |
| 輸出數(shù)目和類型： | 4 電流，單極 |
| 采樣率（每秒）： | 250M |
MAX5878
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 PCB with separate 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, refer-
ence input sense lines, common-mode input, and clock
inputs as practical. Use a symmetric 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 (AVDD1.8 and AVDD3.3), digital
(DVDD1.8 and DVDD3.3), and clock (AVCLK) circuitry. All
power-supply pins must be connected to their proper
supply. Decouple each AVDD, DVDD,and AVCLK input
pin with a separate 0.1F 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 PCB with tantalum or electrolytic capaci-
tors. Ferrite beads with additional decoupling capacitors
forming a pi-network could also improve performance.
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
VOUT, SINGLE-ENDED
Figure 7. Differential-to-Single-Ended Conversion Using a Wideband RF Transformer
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相關代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX5878EGK-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 |
| MAX5878EVKIT | 功能描述:數(shù)模轉(zhuǎn)換器- DAC Evaluation Kit for the MAX5876/MAX5877/MAX5878 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 |
| MAX5878EVKIT# | 功能描述:數(shù)模轉(zhuǎn)換器- DAC Evaluation Kit for the MAX5876/MAX5877/MAX5878 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 |
| MAX5879EVKIT# | 制造商:Maxim Integrated Products 功能描述:EVALUATION KIT FOR THE MAX5879 - Boxed Product (Development Kits) |
| MAX5879EXF+ | 制造商:Maxim Integrated Products 功能描述:14-BIT, 2.3GSPS DIRECT RF SYNTHESIS DAC WITH SELECTABLE FREQ - Rail/Tube |
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