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参数资料
| 型号： | MAX9248GCM/V+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 4/20页 |
| 文件大小： | 0K |
| 描述： | IC DESERIALIZR LVDS 27BIT 48TQFP |
| 标准包装： | 2,000 |
| 系列： | * |
MAX9248/MAX9250
27-Bit, 2.5MHz to 42MHz
DC-Balanced LVDS Deserializers
12
______________________________________________________________________________________
Detailed Description
The MAX9248/MAX9250 DC-balanced deserializers
operate at a 2.5MHz-to-42MHz parallel clock frequen-
cy, deserializing video data to the RGB_OUT[17:0] out-
puts when the data-enable output DE_OUT is high, or
control data to the CNTL_OUT[8:0] outputs when
DE_OUT is low. The outputs on the MAX9248 are pro-
grammable for ±2% or ±4% spread relative to the
LVDS input clock frequency, while the MAX9250 has no
spread, but has an output-enable input that allows out-
put busing. The video phase words are decoded using
two overhead bits, EN0 and EN1. Control phase words
are decoded with one overhead bit, EN0. Encoding,
performed by the MAX9247 serializer, reduces EMI and
maintains DC balance across the serial cable. The seri-
al-input word formats are shown in Tables 1 and 2.
Control data inputs C0 to C4, each repeated over three
serial bit times by the serializer, are decoded using
majority voting. Two or three bits at the same state
determine the state of the recovered bit, providing sin-
gle bit-error tolerance for C0 to C4. The state of C5 to
C8 is determined by the level of the bit itself (no voting
is used).
AC-Coupling Benefits
AC-coupling increases the input voltage of the LVDS
receiver to the voltage rating of the capacitor. Two
capacitors are sufficient for isolation, but four capaci-
tors—two at the serializer output and two at the deseri-
alizer input—provide protection if either end of the
cable is shorted to a high voltage. AC-coupling blocks
low-frequency ground shifts and common-mode noise.
The MAX9247 serializer can also be DC-coupled to the
MAX9248/MAX9250 deserializers. Figures 12 and 14
show the AC-coupled serializer and deserializer with
two capacitors per link, and Figures 13 and 15 show
the AC-coupled serializer and deserializer with four
capacitors per link.
Applications Information
Selection of AC-Coupling Capacitors
See Figure 16 for calculating the capacitor values for
AC-coupling depending on the parallel clock frequen-
cy. The plot shows capacitor values for two- and four-
capacitor-per-link systems. For applications using less
than 18MHz clock frequency, use 0.1F capacitors.
Termination and Input Bias
The IN+ and IN- LVDS inputs are internally connected
to +1.2V through 42k
Ω (min) to provide biasing for AC-
coupling (Figure 1). Assuming 100
Ω interconnect, the
LVDS input can be terminated with a 100
Ω resistor.
Match the termination to the differential impedance of
the interconnect.
Use a Thevenin termination, providing 1.2V bias, on an
AC-coupled link in noisy environments. For intercon-
nect with 100
Ω differential impedance, pull each LVDS
line up to VCC with 130
Ω and down to ground with 82Ω
at the deserializer input (Figures 12 and 15). This termi-
nation provides both differential and common-mode
termination. The impedance of the Thevenin termination
should be half the differential impedance of the inter-
connect and provide a bias voltage of 1.2V.
01234567
89
10
11
12
13
14
15
16
17
18
19
EN0
EN1
S0
S1
S2
S3
S4
S5
S6
S7
S8
S9
S10
S11
S12
S13
S14
S15
S16
S17
Bit 0 is the LSB and is deserialized first. EN[1:0] are encoding bits. S[17:0] are encoded symbols.
Table 1. Serial Video Phase Word Format
0123456789
10
11
12
13
14
15
16
17
18
19
EN0
C0C0C0C1C1C1C2C2C2C3C3C3
C4C4C4C5C6C7C8
Bit 0 is the LSB and is deserialized first. C[8:0] are the mapped control inputs.
Table 2. Serial Control Phase Word Format
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9249 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Gigabit Multimedia Serial Link Serializer with LVDS System Interface |
| MAX9249_12 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Gigabit Multimedia Serial Link Serializer with LVDS System Interface |
| MAX9249EVKIT+ | 功能描述:界面开发工具 MAX9249 Eval Kit RoHS:否 制造商:Bourns 产品:Evaluation Boards 类型:RS-485 工具用于评估:ADM3485E 接口类型:RS-485 工作电源电压:3.3 V |
| MAX9249GCM/V+ | 功能描述:串行器/解串器 - Serdes GSML Serializer w/LVDS Interface RoHS:否 制造商:Texas Instruments 类型:Deserializer 数据速率:1.485 Gbit/s 输入类型:ECL/LVDS 输出类型:LVCMOS 输入端数量:1 输出端数量:20 工作电源电压:2.375 V to 2.625 V 工作温度范围:0 C to + 70 C 封装 / 箱体:TQFP-64 |
| MAX9249GCM/V+T | 功能描述:串行器/解串器 - Serdes GSML Serializer w/LVDS Interface RoHS:否 制造商:Texas Instruments 类型:Deserializer 数据速率:1.485 Gbit/s 输入类型:ECL/LVDS 输出类型:LVCMOS 输入端数量:1 输出端数量:20 工作电源电压:2.375 V to 2.625 V 工作温度范围:0 C to + 70 C 封装 / 箱体:TQFP-64 |
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