Power Requirements
1-3
Overview
1.3
Power Requirements
The EVM operates properly over a balanced input voltage range of
±
10 volts
maximum to
±
7 volts minimum. The power supply and externally applied refer-
ence voltage should be supplied to the EVM through shielded twisted-pair wire
for best performance. This type of power cabling minimizes any stray or tran-
sient pickup from the higher frequency digital circuitry.
Voltage Limits
Exceeding the
±
10-volt maximum can damage EVM components.
Under voltage may cause improper operation of the bipolar op amp
channel A1, depending on the application. The positive supply can
be lowered to 6 volts and the EVM will maintain the 5-V supply.
1.4
I/O CLK Requirements
The I/O CLK can go up to 10 MHz for most of the voltage range when fast I/O
is possible. The maximum I/O CLK is limited to 2.8 MHz for a supply voltage
range from 2.7 V. Table 1–1 lists the maximum I/O CLK frequencies for all dif-
ferent supply voltage ranges. This also depends on input source impedance.
For example, I/O CLK speed faster than 2.39 MHz is achievable if the input
source impedance is less than 1 k
Ω
.
Table 1–1. Maximum I/O CLK Frequency
V
CC
Maximum Input
Resistance (Max)
Source Impedance
I/O CLK
2 7 V
5 K
1 k
Ω
2.39 MHz
2.7 V
5 K
100
Ω
2.81 MHz
4 5 V
1 K
1 k
Ω
7.18 MHz
4.5 V
1 K
100
Ω
10 MHz
Summary of Contents for TLV1544EVM
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