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LTC6754 Datasheet(PDF) 20 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) 20 Page - Analog Devices

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LTC6563
20
Rev. 0
For more information www.analog.com
• Increasing RLDIFF slightly reduces the signal bandwidth.
• Output voltage compliance (VCOMPLIANCE) to be
observed relative to RLDIFF , ADJ settings, and CM volt-
age . Here is an example where output voltage compli-
ance is violated:
RLDIFF = 100Ω, Tilt = VCC, ADJ1 = 1, ADJ0 = 0,
CM = 1.7V, IIN = 90µA
Output Voltage (max)
=
VCM +
IOUT –IOUTBAR
2
RLDIFF
2
Referring to Table 2 to read output current values:
Output Voltage (max)
=
1.7V
+
36mA – 6mA
2
100
Ω
2
= 2.45V!
The maximum output voltage must remain below VCCO
– 1V (~2.3V) to comply with the VCOMPLIANCE rating.
Possible remedies are reducing output current(s) by
using lower power ADJ settings, reducing the input APD
current, reducing the differential load, or reducing the
CM voltage.
Power Considerations
The LTC6563 has many power modes of operation. The
state of the PWRMD, OMUX and ADJ pins will dictate
the amount of current the LTC6563 will draw. Multiple
power modes are offered to allow the user to select the
appropriate one based upon the application while mini-
mizing power dissipation.
Coupling the TIA Input – AC vs DC
Although the LTC6563 can AC-couple to the detector, best
performance is achieved when DC-coupled to a negatively
biased APD. DC-coupling reduces component count while
allowing a DC current path from the APD. The LTC6563
OFFSET feature is designed to cancel DC currents. The
maximum performance for switching speeds and satura-
tion recovery occurs in this DC-coupled configuration.
When AC-coupling to the TIA input, RB, is needed to
establish a bias point for the detector. It is worth noting
that RB is a parallel path with the TIA for the APD current
to flow through and it will impact the effective signal chain
output gain.
This value of the biasing resistor and AC-coupling capaci-
tor, CAC, can potentially create a long time-constant. CAC is
chosen based on the reactance at the frequency of inter-
est. However, RB ideally should be large to avoid stealing
APPLICATIONS INFORMATION
Figure 4. AC-Coupled Detector Circuit
Table 3. LTC6563 Power Dissipation Modes. X = Don’t Care
PWRMD OMUX ADJ1 ADJ0
IVCCI (mA) IVCCO (mA) ITOTAL (mA) DESCRIPTION
0
0
X
X
4.5
0.1
4.6
LTC6563 shutdown.
0
1
0
0
21
24.5
45.5
LTC6563 enabled, non-selected inputs powered down, CM pin control
disabled. This setting appropriate for a Responder device in a multi-chip/
multi-channel application.
0
1
0
1
21
38
59
0
1
1
0
21
51.5
72.5
0
1
1
1
21
64.5
85.5
1
0
X
X
35
0.1
35.1
LTC6563 deselected (outputs stage off), non-selected inputs powered up.
1
1
0
0
34
24.5
58.5
LTC6563 enabled, non-selected inputs powered up, CM pin control active
in setting output CM voltage. This setting appropriate for a Controller
device in a multi-chip/multi-channel application.
1
1
0
1
34
38
72
1
1
1
0
34
51.5
85.5
1
1
1
1
34
64.5
98.5
–HV
–HV
CAC
RB
APD
APD
6563 F04
AC-COUPLED TIA
DC-COUPLED TIA


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