- 您现在的位置：买卖IC网 > PDF目录10741 > MAX19705ETM+T (Maxim Integrated Products)IC ANLG FRNT END 48-TQFN PDF资料下载
参数资料
| 型号： | MAX19705ETM+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 22/37页 |
| 文件大小： | 0K |
| 描述： | IC ANLG FRNT END 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）： | 28.2mW |
| 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) |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页当前第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页
MAX19705
10-Bit, 7.5Msps, Ultra-Low-Power
Analog Front-End
______________________________________________________________________________________
29
Reference Configurations
The MAX19705 features an internal precision 1.024V
bandgap reference that is stable over the entire power-
supply and temperature ranges. The REFIN input pro-
vides two modes of reference operation. The voltage at
REFIN (VREFIN) sets the reference operation mode
(Table 17).
In internal reference mode, connect REFIN to VDD.
VREF is an internally generated 0.512V ±4%. COM,
REFP, and REFN are low-impedance outputs with
VCOM = VDD / 2, VREFP = VDD / 2 + VREF / 2, and
VREFN = VDD / 2 - VREF / 2. Bypass REFP, REFN, and
COM each with a 0.33F capacitor. Bypass REFIN to
GND with a 0.1F capacitor.
In buffered external reference mode, apply 1.024V
±10% at REFIN. In this mode, COM, REFP, and REFN
are low-impedance outputs with VCOM = VDD / 2,
VREFP = VDD / 2 + VREFIN / 4, and VREFN = VDD / 2 -
VREFIN / 4. Bypass REFP, REFN, and COM each with a
0.33F capacitor. Bypass REFIN to GND with a 0.1F
capacitor. In this mode, the Tx DAC full-scale output is
proportional to the external reference. For example, if
the VREFIN is increased by 10% (max), the Tx DAC full-
scale output is also increased by 10% or ±440mV.
Applications Information
Using Balun Transformer AC-Coupling
An RF transformer (Figure 8) provides an excellent
solution to convert a single-ended signal source to a
fully differential signal for optimum ADC performance.
Connecting the center tap of the transformer to COM
provides a VDD / 2 DC level shift to the input. A 1:1
transformer can be used, or a step-up transformer can
be selected to reduce the drive requirements. In gener-
al, the MAX19705 provides better SFDR and THD with
fully differential input signals than single-ended signals,
especially for high input frequencies. In differential
mode, even-order harmonics are lower as both inputs
(IAP, IAN, QAP, QAN) are balanced, and each of the
Rx ADC inputs only requires half the signal swing com-
pared to single-ended mode. Figure 9 shows an RF
transformer converting the MAX19705 Tx DAC differen-
tial analog outputs to single-ended.
Table 17. Reference Modes
VREFIN
REFERENCE MODE
> 0.8V x VDD
Internal Reference Mode. VREF is internally generated to be 0.512V. Bypass REFP, REFN, and COM each
with a 0.33F capacitor.
1.024V ±10%
Buffered External Reference Mode. An external 1.024V ±10% reference voltage is applied to REFIN. VREF is
internally generated to be VREFIN / 2. Bypass REFP, REFN, and COM each with a 0.33F capacitor. Bypass
REFIN to GND with a 0.1F capacitor.
Figure 8. Balun Transformer-Coupled Single-Ended-to-
Differential Input Drive for Rx ADC
COM
IAP
IAN
25
0.1
F
0.33
F
25
0.1
F
VIN
MAX19705
22pF
QAP
QAN
25
0.1
F
0.33
F
25
0.1
F
VIN
22pF
相关PDF资料 |
PDF描述 |
|---|---|
| MAX978ESE+ | IC COMPARATOR QUAD 16-SOIC |
| MAX5866ETM+T | IC ANLG FRONT END 60MSPS 48-TQFN |
| MAX978EEE+ | IC COMPARATOR QUAD 16-QSOP |
| MAX913CPA+ | IC COMPARATOR TTL SNGL HS 8-DIP |
| ISL98002CRZ-140 | IC VID DIGITIZER 3CHN AFE 72-QFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX19705EVCMOD2 | 功能描述:ADC / DAC多通道 Evaluation System for the MAX19705 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 |
| MAX19705EVCMODU | 功能描述:ADC / DAC多通道 Evaluation System for the MAX19705 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 |
| MAX19705EVKIT | 功能描述:数据转换 IC 开发工具 Evaluation Kit for the MAX19705 MAX19706 MAX19707 MAX19708 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 |
| MAX19706ETM | 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 |
| MAX19706ETM+ | 功能描述:ADC / DAC多通道 22Msps CODEC/AFE 1.8/2.7-3.3V 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 |
发布紧急采购，3分钟左右您将得到回复。