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參數(shù)資料
| 型號： | MAX9273GTL/V+ |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 33/49頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC SERIALIZER 22BIT GMSL 40TQFN |
| 標準包裝： | 50 |
| 系列： | * |
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MAX9273
22-Bit GMSL Serializer with Coax or
STP Cable Drive
39
Maxim Integrated
Internal Input Pulldowns
The control and configuration inputs (except three-level
inputs) include a pulldown resistor to GND. External pull-
down resistors are not needed.
Choosing I2C/UART Pullup Resistors
The I2C and UART open-drain lines require a pullup
resistor to provide a logic-high level. There are tradeoffs
between power dissipation and speed, and a compro-
mise may be required when choosing pullup resistor
values. Every device connected to the bus introduces
some capacitance even when the device is not in opera-
tion. I2C specifies 300ns rise times (30% to 70%) for fast
mode, which is defined for data rates up to 400kbps (see
the I2C specifications in the AC Electrical Characteristics
table for details). To meet the fast-mode rise-time require-
ment, 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
serializer supports I2C/UART rates up to 1Mbps (UART-
to-I2C mode) and 400kbps (I2C-to-I2C mode).
AC-Coupling
AC-coupling isolates the receiver from DC voltages up
to the voltage rating of the capacitor. Capacitors at the
serializer output and at the deserializer input are needed
for proper link operation and to provide protection if
either end of the cable is shorted to battery. 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 trans-
mitted symbols cause signal transitions to start from dif-
ferent voltage levels. Because the transition time is fixed,
starting the signal transition from different voltage 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/coax receiver termination resistor
(RTR), the CML/coax 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 differential,
50I single-ended). This leaves the capacitor selection
to change the system time constant. Use 0.2FF or larger
high-frequency surface-mount ceramic capacitors, with
sufficient voltage rating to withstand 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 serializer uses an AVDD and DVDD of 1.7V to 1.9V.
All inputs and outputs, except for the serial output, derive
power from an IOVDD of 1.7V to 3.6V that scales with
IOVDD. Proper voltage-supply bypassing is essential for
high-frequency circuit stability.
Power-Supply Table
Power-supply currents shown in the Electrical
Characteristics table are the sum of the currents from
AVDD, DVDD, and IOVDD. Typical currents from the
individual power supplies are shown in Table 13.
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. Coax cables typically have a characteristic
impedance of 50I (contact the factory for 75I operation).
Table 14 lists the suggested cables and connectors used
in the GMSL link.
Table 14. Suggested Connectors and Cables for GMSL
Table 13. Typical Power-Supply Currents
(Using Worst-Case Input Pattern)
SUPPLIER
CONNECTOR
CABLE
TYPE
Rosenberger
59S2AX-400A5-Y
RG174
Coax
JAE
MX38-FF
A-BW-Lxxxxx
STP
Nissei
GT11L-2S
F-2WME AWG28
STP
Rosenberger
D4S10A-40ML5-Z
Dacar 538
STP
PCLK
(MHz)
AVDD
(mA)
DVDD
(mA)
IOVDD
(mA)
25
29.5
9.4
0.2
50
34.9
14.4
0.3
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