參數(shù)資料
型號(hào)： MAX3902
廠商： Maxim Integrated Products, Inc.
英文描述： 150Mbps Automotive Fiber Optic Receivers
中文描述： 150Mbps汽車(chē)光纖接收器
文件頁(yè)數(shù)： 8/13頁(yè)
文件大?。?/td> 623K
代理商： MAX3902
M
150Mbps Automotive Fiber Optic Receiver
8
_______________________________________________________________________________________
Detailed Description
The MAX3901/MAX3902 receivers are optimized for
automotive fiber optic applications. The MAX3901 is a
single-ended TTL output receiver. The MAX3902 is a
differential CML output receiver. The MAX3901/
MAX3902 are both comprised of a transimpedance
amplifier, a voltage-gain amplifier, an output buffer, a
DC cancellation circuit, and a power detector with sta-
tus monitor, as shown in Figure 2.
Signal Path
The signal path consists of a transimpedance amplifier, a
voltage-gain amplifier, and a DC cancellation circuit. The
transimpedance amplifier converts input current to volt-
age. The voltage-gain amplifier converts single-ended to
differential voltage. The DC cancellation circuit uses low-
frequency feedback to remove the DC component of the
input signal. This feature centers the input signal within
the transimpedance amplifier
’
s linear range, thereby
reducing pulse-width distortion. The highpass response
of the DC cancellation circuit limits the number of con-
secutive identical digits that can be tolerated.
TTL Output Buffer
The output buffer for the MAX3901 is a single-ended
TTL output designed to drive a high-impedance load.
Output capacitance should be less than 15pF to ensure
stable operation. The TTL output is not compatible with
50
test equipment. Use a high-impedance probe to
monitor the output.
During standby mode, the TTL output is actively pulled
to a low state.
CML Output Buffer
The output buffer for the MAX3902 is a differential CML
output designed to drive a 100
differential load between
OUT+ and OUT- (Figure 3). For optimum supply noise
rejection, the MAX3902 should be terminated with a dif-
ferential load. If a single-ended output is required, both
the used and the unused outputs should be terminated in
a similar manner.
DC
CANCELLATION
OUT+
(MAX3902)
OUT-
(MAX3902)
IN
FILT
VOLTAGE
AMPLIFIER
OUT_TTL
(MAX3901)
STATUS
V
CC
INTERNAL
V
CC
MAX3901
MAX3902
CML
TIA
TTL
POWER
DETECTOR
Figure 2. Functional Diagram
Pad Description
BOND
PAD
MAX3901
NAME
MAX3902
NAME
FUNCTION
1
FILT
FILT
Filter Pin. Must be connected to photodiode cathode for the IC to operate. This pin provides
connection to an integrated photodiode filter.
2
IN
IN
Data Input. Connect photodiode anode to this pin.
3, 4,
13, 14, 15
N.C.
N.C.
No Connection
5, 6, 7
8, 16, 17
9
10
V
CC
GND
N.C.
N.C.
V
CC
GND
OUT+
OUT-
Supply Voltage
Circuit Ground
Noninverting Data Output. Current flowing into IN causes the voltage at OUT+ to increase.
Inverting Data Output. Current flowing into IN causes the voltage at OUT- to decrease.
11
STATUS
STATUS
Status Monitor. STATUS is TTL low when the receiver is in operating mode. STATUS is TTL
high when the receiver is in standby mode.
12
OUT_TTL
N.C.
TTL Data Output. Current flowing into IN causes the voltage at OUT_TTL to increase.
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