MAX3968C/D(2002) Просмотр технического описания (PDF) - Maxim Integrated
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производитель
MAX3968C/D
(Rev.:2002)
(Rev.:2002)
Maxim Integrated
MAX3968C/D Datasheet PDF : 12 Pages
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+3.0V to +5.5V, 125Mbps to 266Mbps
Limiting Amplifiers with Loss-of-Signal Detector
PIN
QSOP QFN
1
19
2
20
3
1
4
2
5
6
7
8
9, 10
11
3
4
5
—
6, 7, 8
9
12
10
13
11
14
12
15
13
16
14
17
15
18
16
19, 20 17, 18
—
EP
Pin Description
NAME
FUNCTION
SQUELCH
VTH
INV
FILTER
RSSI
Squelch Input. The squelch function disables the data outputs by forcing OUT- low and OUT+
high during a loss-of-signal condition. Connect to GND or leave unconnected to disable.
Connect to VCC to enable squelching.
Output of Internal Op Amp that Sets Loss-of-Signal Threshold Voltage (Figure 1). Connect a
resistor from VTH to INV and from INV to ground (minimum resistance 100kΩ) to program the
desired threshold voltage.
Inverting Input of Internal Op Amp that Sets Loss-of-Signal Threshold Voltage (Figure 1).
Connect a resistor from VTH to INV and from INV to ground (minimum resistance 100kΩ) to
program the desired threshold voltage.
Filter Output of Full-Wave Logarithmic Detectors (FWDs). The FWD outputs are summed
together at FILTER to generate the received-signal-strength indicator (RSSI). Connect a
capacitor from FILTER to VCC for proper operation.
Received-Signal-Strength Indicator Output. The analog DC voltage at RSSI indicates the input
signal power. The RSSI output is reduced approximately 120mV when LOS+ is asserted.
IN-
Inverting Data Input
IN+
Noninverting Data Input
SUB
Substrate. Connect to ground.
GND
Ground
CZP
CZN
VCCO
Auto-Zero Capacitor Input. Connect a capacitor between CZP and CZN to determine the offset-
correction-loop bandwidth.
Auto-Zero Capacitor Input. Connect a capacitor between CZP and CZN to determine the offset-
correction-loop bandwidth.
Output Buffer Supply Voltage. Connect to the same potential as VCC, but filter VCCO and VCC
separately.
OUT+ Noninverting PECL Data Output. Terminate with 50Ω to (VCC - 2V).
OUT-
Inverting PECL Data Output. Terminate with 50Ω to (VCC - 2V).
LOS-
Inverting Loss-of-Signal Output. LOS- is asserted low when input power drops below the LOS
threshold. For the MAX3964/MAX3968, this pin is PECL compatible and should be terminated
with 50Ω to (VCC - 2V). For the MAX3965, this outpt is TTL compatible and does not require
termination.
LOS+
Noninverting Loss-of-Signal Output. LOS+ is asserted high when input power drops below the
LOS threshold. For the MAX3964/MAX3968, this pin is PECL compatible and should be
terminated with 50Ω to (VCC - 2V). For the MAX3965, this output is TTL compatible and does not
require termination.
VCCO
GNDO
VCC
Exposed
Pad
MAX3964/MAX3968: This pin can be left open or connected to the positive supply.
MAX3965: This pin must be connected to ground.
+3.0V to +5.5V Supply Voltage
Connect the exposed pad to board ground for optional electrical and thermal performance.
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