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CDB5560
3. HARDWARE DESCRIPTION
3.1
Absolute Maximum Ratings
Observe the following limits to ensure the CDB5560 component ratings are not exceeded.
? CS5560
– The absolute maximum supply voltage that can be applied to the +3.3V power supply
connection is +3.6V.
– The absolute maximum power supply voltage that can be applied between pins VL and V1-
is 6.1 V.
? LMP7732
– The absolute maximum power supply voltage that can be applied between the +2.5V and
-2.5V power supply connections is +5.5V.
3.2
Power Supply
Power supply connections and requirements are specified in Table 1. below.
Table 1. Power Supply Connections
Power Supply
Requirement
+2.5 V DC, ±5%, <50 mA
-2.5 V DC, ±5%, <50 mA
+3.3 V DC, ±5%, <50 mA
Power Supply
Connection
E5
E9
E16
Associated
Ground Return
E3
E7
E13
Associated
Test Points
TP2, TP1 (GND)
TP4, TP3 (GND)
TP6, TP5 (GND)
Important: It is recommended that all power supplies be isolated from utility ground to prevent the intro-
duction of a ground loop. One ground connection may already exist through the serial port connection to
utility ground. Using the Cirrus Logic CapturePlus II system simplifies making connections to the
CDB5560 by providing electrical isolation between the two.
Using twisted/shielded wire will reduce electrical noise induced onto the power supply cables.
Power supplies are to be adequately regulated and sufficiently low noise to meet the application require-
ments.
3.3
3.3.1
Analog Section
Analog Input Buffers
The analog input signal connections to the input buffers are made at the INPUT A and INPUT B connec-
tors, as specified in Table 2.
Table 2. Analog Input Connections
Analog Input
Differential Input Signal
Channel
INPUT A
INPUT B
Connection
J4
J5
Voltage Range
-4.096 V to +4.096 V
-4.096 V to +4.096 V
Impedance
50 Ohms
50 Ohms
There are two analog input channels on the evaluation board. National Semiconductor LMP7732. Each
analog input channel consists of two low-noise amplifiers configured as unity gain non-inverting buffers.
The buffers utilize two National Semiconductor LMP7732 precision, low-noise, low-voltage, dual op-
amps. These op-amps enable both the inputs and outputs of the analog input buffer to operate virtually
rail to rail. The channel input impedance is 50 Ohms.
6
DS713DB4
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