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參數(shù)資料
| 型號： | MAX5865 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Ultra-Low-Power, High-Dynamic- Performance, 40Msps Analog Front End |
| 中文描述： | 超低功耗、高動(dòng)態(tài)性能、40Msps模擬前端 |
| 文件頁數(shù)： | 20/26頁 |
| 文件大?。?/td> | 2144K |
| 代理商： | MAX5865 |
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M
Using Op-Amp Coupling
Drive the MAX5865 ADCs with op amps when a balun
transformer is not available.
Figures 9 and 10
show the
ADCs being driven by op amps for AC-coupled single-
ended, and DC-coupled differential applications.
Amplifiers such as the MAX4354/MAX4454 provide
high speed, high bandwidth, low noise, and low distor-
tion to maintain the input signal integrity.
Figure 10
can
also be used to interface with the DAC differential ana-
log outputs to provide gain or buffering. The DAC dif-
ferential analog outputs cannot be used in single-
ended mode because of the internally generated
1.4VDC common-mode level. Also, the DAC analog
outputs are designed to drive a differential input stage
with input impedance
≥
70k
. If single-ended outputs
are desired, use an amplifier to provide differential to
single-ended conversion and select an amplifier with
proper input common-mode voltage range.
FDD and TDD Modes
The MAX5865 can be used in diverse applications
operating FDD or TDD modes. The MAX5865 operates
in Xcvr mode for FDD applications such as WCDMA-
3GPP (FDD) and 4G technologies. Also, the MAX5865
can switch between Tx and Rx modes for TDD applica-
tions like TD-SCDMA, WCDMA-3GPP (TDD),
IEEE802.11a/b/g, and IEEE802.16.
In FDD mode, the ADC and DAC operate simultaneously.
The ADC bus and DAC bus are dedicated and must be
connected in 18-bit parallel (8-bit ADC and 10-bit DAC)
to the digital baseband processor. Select Xcvr mode
through the 3-wire serial interface and use the conversion
clock to latch data. In FDD mode, the MAX5865 uses
75.6mW power at f
CLK
= 40MHz. This is the total power
of the ADC and DAC operating simultaneously.
In TDD mode, the ADC and DAC operate independent-
ly. The ADC and DAC bus are shared and can be con-
nected together, forming a single 10-bit parallel bus to
the digital baseband processor. Using the 3-wire serial
interface, select between Rx mode to enable the ADC
and Tx mode to enable the DAC. When operating in Rx
mode, the DAC does not transmit because the core is
disabled and in Tx mode, the ADC bus is tri-state. This
eliminates any unwanted spurious emissions and pre-
vents bus contention. In TDD mode, the MAX5865 uses
63mW power in Rx mode at f
CLK
= 40MHz, and the
DAC uses 38.4mW in Tx mode.
Figure
11 illustrates the MAX5865 working with the
MAX2820 in TDD mode to provide a complete 802.11b
radio front-end solution. Because the MAX5865 DAC has
full differential analog outputs with a common-mode level
of 1.4V, and the ADC has wide-input common-mode
Ultra-Low-Power, High-Dynamic-
Performance, 40Msps Analog Front End
20
______________________________________________________________________________________
Figure 9. Single-Ended Drive for ADCs
MAX5865
0.1
μ
F
1k
1k
100
100
C
IN
22pF
C
IN
22pF
INB+
INB-
COM
INA+
INA-
0.1
μ
F
R
ISO
50
R
ISO
50
REFP
REFN
V
IN
0.1
μ
F
1k
1k
100
100
C
IN
22pF
C
IN
22pF
0.1
μ
F
R
ISO
50
R
ISO
50
REFP
REFN
V
IN
Figure 8. Balun-Transformer Coupled Differential to Single-
Ended Output Drive for DACs
MAX5865
ID+
ID-
V
OUT
QD+
QD-
V
OUT
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| MAX5865ETM | Ultra-Low-Power, High-Dynamic- Performance, 40Msps Analog Front End |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX5865ETM | 功能描述:ADC / DAC多通道 RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換速率: 分辨率:8 bit 接口類型:SPI 電壓參考: 電源電壓-最大:3.6 V 電源電壓-最小:2 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-40 |
| MAX5865ETM+ | 功能描述:ADC / DAC多通道 10-Bit 2Ch 40Msps CODEC/AFE RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換速率: 分辨率:8 bit 接口類型:SPI 電壓參考: 電源電壓-最大:3.6 V 電源電壓-最小:2 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-40 |
| MAX5865ETM+T | 功能描述:ADC / DAC多通道 10-Bit 2Ch 40Msps CODEC/AFE RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換速率: 分辨率:8 bit 接口類型:SPI 電壓參考: 電源電壓-最大:3.6 V 電源電壓-最小:2 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-40 |
| MAX5865ETM-D | 制造商:Maxim Integrated Products 功能描述:DUAL 10BIT DAC & DUAL 8BIT ADC 40MSPS CODEC - Rail/Tube |
| MAX5865ETM-T | 功能描述:ADC / DAC多通道 RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換速率: 分辨率:8 bit 接口類型:SPI 電壓參考: 電源電壓-最大:3.6 V 電源電壓-最小:2 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-40 |
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