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AD8143 Datasheet(PDF) 18 Page - Analog Devices

Part # AD8143
Description  High Speed, Triple Differential Receiver with Comparators
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD8143 Datasheet(HTML) 18 Page - Analog Devices

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AD8143
Rev. 0 | Page 18 of 24
APPLICATIONS
OVERVIEW
The AD8143 contains three independent active-feedback
amplifiers that can be effectively applied as differential line
receivers for red-green-blue (RGB) signals or component video,
such as YPbPr, signals transmitted over unshielded-twisted-pair
(UTP) cable. The AD8143 also contains two general-purpose
comparators with hysteresis that can be used to receive digital
signals or to extract video synchronization pulses from received
common-mode signals that contain encoded synchronization
signals.
An internal linear voltage regulator derives power for the
comparators from the positive supply; therefore, the AD8143
must always have a minimum positive supply voltage of 4.5 V.
The AD8143 includes a power-down feature that can be
asserted to reduce the supply current when a particular device
is not in use.
BASIC CLOSED-LOOP GAIN CONFIGURATIONS
As described in the Theory of Operation section, placing a
resistive feedback network between an amplifier output and its
respective feedback amplifier input creates a stable negative
feedback amplifier. It is important to note that the closed-loop
gain of the amplifier used in the signal path is defined as the
amplifier’s single-ended output voltage divided by its differential
input voltage. Therefore, each amplifier in the AD8143 provides
differential-to-single-ended gain. Additionally, the amplifier
used for feedback has two high impedance inputs—the FB
input, where the negative feedback is applied, and the REF
input, which can be used as an independent single-ended
input to apply a dc offset to the output signal. Some basic
gain configurations implemented with an AD8143 amplifier
are shown in Figure 37 through Figure 39.
+
+
+5V
–5V
REF
VREF
FB
RG
RF
0.01
μF
0.01
μF
VIN
VOUT
Figure 37. Basic Gain Circuit: VOUT = (VIN + VREF)(1 + RF/RG)
The gain equation for the circuit in Figure 37 is
VOUT = (VIN + VREF)(1 + RF/RG)
(1)
In this configuration, the voltage applied to the REF pin appears
at the output with a gain of 1 + RF/RG.
To achieve unity gain from VREF to VOUT in this configuration,
divide VREF by the same factor used in the feedback loop; the
same RF and RG values can be used. Figure 38 illustrates this
approach.
+
+
+5V
–5V
REF
VREF
FB
RG
RG
RF
RF
0.01
μF
0.01
μF
VIN
VOUT
Figure 38. Basic Gain Circuit: VOUT = VIN (1 + RF/RG) + VREF
The gain equation for the circuit in Figure 38 is
VOUT = VIN (1 + RF/RG) + VREF
(2)
Another configuration that provides the same gain equation as
Equation 2 is shown in Figure 39. In this configuration, it is
important to keep the source resistance of VREF much smaller
than RG to avoid gain errors.
+
+
+5V
–5V
REF
FB
RG
RF
0.01
μF
0.01
μF
VIN
VOUT
VREF
Figure 39. Basic Gain Circuit: VOUT = VIN (1 + RF/RG) + VREF
For stability reasons, the inductance of the trace connected to
the REF pin must be kept to less than 10 nH. The typical
inductance of 50 Ω traces on the outer layers of the FR-4 boards
is 7 nH/in, and on the inner layers, it is typically 9 nH/in. Vias
must be accounted for as well. The inductance of a typical via in
a 0.062-inch board is on the order of 1.5 nH. If longer traces are
required, a 200 Ω resistor should be placed in series with the
trace to reduce the Q-factor of the inductance.


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