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參數(shù)資料
| 型號： | MAX9249GCM/V+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 22/36頁 |
| 文件大小： | 0K |
| 描述： | IC SERIALIZER GMSL LVDS 48TQFP |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 2,000 |
| 功能： | 串行器 |
| 數(shù)據(jù)速率： | 2.5Gbs |
| 輸入類型： | LVDS |
| 輸出類型： | 串行 |
| 電源電壓： | 3 V ~ 3.6 V |
| 工作溫度： | -40°C ~ 105°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 48-TQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 48-TQFP（7x7） |
| 包裝： | 帶卷 (TR) |
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______________________________________________________________________________________ 29
MAX9249
Gigabit Multimedia Serial Link
Serializer with LVDS System Interface
Table 10. Line-Fault Mapping
Choosing I2C/UART Pullup Resistors
Both I2C/UART open-drain lines require pullup resis-
tors to provide a logic-high level. There are trade-offs
between power dissipation and speed, and a compro-
mise made in choosing pullup resistor values. Every
device connected to the bus introduces some capaci-
tance even when the device is not in operation. I2C
specifies 300ns rise times to go from low to high (30% to
70%) for fast mode, which is defined for data rates up to
400kbps (see the I2C specifications in the AC Electrical
Characteristics section for details). To meet the fast-
mode rise-time requirement, choose the pullup resistors
so that rise time tR = 0.85 x RPULLUP x CBUS < 300ns.
The waveforms are not recognized if the transition time
becomes too slow. The MAX9249 supports I2C/UART
rates up to 1Mbps.
AC-Coupling
AC-coupling isolates the receiver from DC voltages up
to the voltage rating of the capacitor. Four capacitors—
two at the serializer output and two at the deserializer
input—are needed for proper link operation and to pro-
vide protection if either end of the cable is shorted to a
high voltage. AC-coupling blocks low-frequency ground
shifts and low-frequency common-mode noise.
Selection of AC-Coupling Capacitors
Voltage droop and the digital sum variation (DSV) of
transmitted symbols cause signal transitions to start
from different voltage levels. Because the transition time
is finite, starting the signal transition from different volt-
age levels causes timing jitter. The time constant for an
AC-coupled link needs to be chosen to reduce droop
and jitter to an acceptable level. The RC network for an
AC-coupled link consists of the CML receiver termination
resistor (RTR), the CML driver termination resistor (RTD),
and the series AC-coupling capacitors (C). The RC time
constant for four equal-value series capacitors is (C x
(RTD + RTR))/4. RTD and RTR are required to match the
transmission line impedance (usually 100I). This leaves
the capacitor selection to change the system time con-
stant. Use at least 0.2FF high-frequency surface-mount
ceramic capacitors, with sufficient voltage rating to with-
stand a short to battery, to pass the lower speed reverse
control-channel signal. Use capacitors with a case size
less than 3.2mm x 1.6mm to have lower parasitic effects
to the high-speed signal.
Power-Supply Circuits and Bypassing
The MAX9249 uses a VAVDD and VDVDD of 1.7V to
1.9V, and a VLVDSVDD of 3.0V to 3.6V. All single-ended
inputs and outputs on the MAX9249 derive power from a
VIOVDD of 1.7V to 3.6V, which scale with IOVDD. Proper
voltage-supply bypassing is essential for high-frequency
circuit stability.
Cables and Connectors
Interconnect for CML typically has a differential imped-
ance of 100I. Use cables and connectors that have
matched differential impedance to minimize impedance
discontinuities. Twisted-pair and shielded twisted-pair
cables tend to generate less EMI due to magnetic-field
canceling effects. Balanced cables pick up noise as
common mode rejected by the CML receiver. Table 11
lists the suggested cables and connectors used in the
GMSL link.
REGISTER
ADDRESS
BITS
NAME
VALUE
LINE-FAULT TYPE
0x08
D[3:2]
LFNEG
00
Negative cable wire shorted to battery
01
Negative cable wire shorted to ground
10
Normal operation
11
Negative cable wire open
D[1:0]
LFPOS
00
Positive cable wire shorted to battery
01
Positive cable wire shorted to ground
10
Normal operation
11
Positive cable wire open
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