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参数资料
| 型号： | MAX5865ETM+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 13/26页 |
| 文件大小： | 0K |
| 描述： | IC ANLG FRONT END 40MSPS 48-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 位数： | 10 |
| 通道数： | 4 |
| 功率（瓦特）： | 2.10W |
| 电压 - 电源，模拟： | 2.7 V ~ 3.3 V |
| 电压 - 电源，数字： | 1.8 V ~ 3.3 V |
| 封装/外壳： | 48-WFQFN 裸露焊盘 |
| 供应商设备封装： | 48-TQFN-EP（7x7） |
| 包装： | 带卷 (TR) |
MAX5865
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 fCLK = 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 fCLK = 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
F
1k
1k
100
100
CIN
22pF
CIN
22pF
INB+
INB-
COM
INA+
INA-
0.1
F
RISO
50
RISO
50
REFP
REFN
VIN
0.1
F
1k
1k
100
100
CIN
22pF
CIN
22pF
0.1
F
RISO
50
RISO
50
REFP
REFN
VIN
Figure 8. Balun-Transformer Coupled Differential to Single-
Ended Output Drive for DACs
MAX5865
ID+
ID-
VOUT
QD+
QD-
VOUT
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX5865EVKIT | 功能描述:数据转换 IC 开发工具 Evaluation Kit for the MAX5863 MAX5864 MAX5865 RoHS:否 制造商:Texas Instruments 产品:Demonstration Kits 类型:ADC 工具用于评估:ADS130E08 接口类型:SPI 工作电源电压:- 6 V to + 6 V |
| MAX5866ETM | 功能描述:ADC / DAC多通道 RoHS:否 制造商:Texas Instruments 转换速率: 分辨率:8 bit 接口类型:SPI 电压参考: 电源电压-最大:3.6 V 电源电压-最小:2 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-40 |
| MAX5866ETM+ | 功能描述:ADC / DAC多通道 10-Bit 2Ch 60Msps CODEC/AFE RoHS:否 制造商:Texas Instruments 转换速率: 分辨率:8 bit 接口类型:SPI 电压参考: 电源电压-最大:3.6 V 电源电压-最小:2 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-40 |
| MAX5866ETM+T | 功能描述:ADC / DAC多通道 10-Bit 2Ch 60Msps CODEC/AFE RoHS:否 制造商:Texas Instruments 转换速率: 分辨率:8 bit 接口类型:SPI 电压参考: 电源电压-最大:3.6 V 电源电压-最小:2 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-40 |
| MAX5866ETM-T | 功能描述:ADC / DAC多通道 RoHS:否 制造商:Texas Instruments 转换速率: 分辨率:8 bit 接口类型:SPI 电压参考: 电源电压-最大:3.6 V 电源电压-最小:2 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-40 |
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