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LTC6754 Datasheet(PDF) 26 Page - Analog Devices

Part # LTC6754
Description  Four-Channel Transimpedance Amplifier with Output Multiplexing
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

LTC6754 Datasheet(HTML) 26 Page - Analog Devices

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LTC6563
26
Rev. 0
For more information www.analog.com
APPLICATIONS INFORMATION
Under these conditions, the following pin settings should
be used:
1. TERM and TERM should be left floating.
2. An external circuit capable of sinking the output cur-
rent must be used. This task is most easily accom-
plished by providing external termination to ground.
3. The CM pin
must be tied to the expected output CM
voltage. The output clamps levels are calculated from
CM and HI pins, so failure to set the CM pin properly
may result in undesired signal clamping.
When the TERM and TERM pins are left floating, the out-
put CM voltage will be solely a function of the LTC6563
ADJ setting and the external CM load. For example, with
ADJ11 setting (IO = 28mA) and 50Ω to ground on each
output, the output CM voltage will be:
VCMO = IO • RLOAD_CM = 28mA • 50Ω = 1.4V
(4)
With the CM servo loop function disabled, the LTC6563’s
CM pin should be tied to a voltage that is close to the
expected CM value (1.4V in the example stated just
above). The output clamp circuit assumes that CM is
equal to the actual output CM voltage. If this is not the
case, the clamping voltage set by the HI pin will be miscal-
culated, and undesired signal clipping may result. For this
purpose, a replica VCMO voltage can simply be generated
off the device VCC pin using kΩ range voltage division
resistors.
Increasing Output Impedance
It may be desirable to change the output termination
impedance in order to adjust the output signal ampli-
tude. In addition, the flexibility of LTC6563’s output
structure allows for impedance matching to a variety of
different loads or transmission line impedances, which
is critical for high speed signal integrity. In the following
example, the output circuit will be modified to present a
75Ω source impedance for driving a 75Ω transmission
line and ADC load.
Consider the configuration shown in Figure 11 schematic.
The output impedance of the LTC6563 is raised to 75Ω
by adding 24.9Ω resistors in series with the internal 50Ω
TERM resistors. The TIA now presents an output imped-
ance that matches the 75Ω transmission line as well as
the net ADC-side SE impedance. The transmission line
ADC-side impedance can be calculated by:
((200Ω/2) + (2 • 4.99) || 300 Ω) = 80Ω.
Let’s now take a look at the output CM voltage that per-
tains to the schematic of Figure 11, simplified in Figure 12:
Figure 11. Increasing Diff Load Resistance and Matching to 75Ω
4.99
4.99
4.99
4.99
4.99
4.99
4pF
4pF
4pF
300
300
0.1µF
75 TRANSMISSION LINE
6563 F11
R
R
OMUX
OUT
OUT
TERM
TERM
PWRMD
OUTPUT
STAGE
TILT
ADJ0
ADJ1
BIAS
CTRL
50
50
IO CTRL
CM CTRL
IO CTRL
VCC
VCC
LTC6563
OUTPUT SECTION
CM
0.1µF
CM
×2
×1
OUTPUT
CLAMPS
LO
HI
CM CONROL
LOOP
HI CTRL
+
+
75 TRANSMISSION LINE
RS1
24.9
RS2
24.9
200
DIFF
INPUT
AD9094
VCM


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