Texas Instruments PCM4222EVM, User Manual

Page: 7 / 24

www.ti.com
2.3 Power Supplies
VCC +5V +3.3V VDD
+5V DGND +15V
+15V
-
15V
-
15V
AGND
EXT
VCC
EXT
VDD
+3.3V
Regulator
+4.0V
Regulator
J12
Digital Power
J3
Analog Power
REG
1
3
2
4
EXT
JMP6
REG
1
3
2
4
EXT
JMP5
U23 U22
Hardware Configuration
The PCM4222EVM includes two terminal blocks for connection of external power supplies. Terminal block
J3 supports analog power supplies, while terminal block J12 supports digital power supplies. Refer to
Table 1 for absolute operating conditions. Table 2 shows the recommended power supply range for the
PCM4222EVM.
Table 2. Recommended Power Supply Range
PARAMETER MIN MAX UNIT
Analog Power Supplies (J3)
+15V +6.0 +15.0 VDC
-15V -6.0 -15 VDC
EXT VCC +3.8 +4.2 VDC
Digital Power Supplies (J12)
+5V +4.5 +5.5 VDC
EXT VDD +2.4 +3.6 VDC
The PCM4222EVM requires a minimum of two external dc power supplies for the analog functions. The
two power supplies are labeled as +15V and –15V on terminal block J3. The +15V and –15V supplies
should be regulated and capable of providing a minimum of 200mA of current each.
The PCM4222 requires a +4.0V nominal dc supply for operation of the internal analog circuitry.
Designated as VCC, this supply may be derived from the +15V analog power supply using an onboard
linear regulator circuit, comprised of U23 and the associated components. The regulator circuit is
protected in the event that a short-circuit occurs between the +15V supply and ground. The EVM also
supports an ex4.0V power supply, which may be connected at the EXT VCC terminal of J3.
Jumper JMP6 is used to select the onboard regulated supply or an external power source.
Figure 3
illustrates the jumper options.
Figure 3. Power Supply Jumper Configuration
In addition to the analog supplies, the PCM4222EVM requires at least one digital power supply, connected
at the +5V terminal of J12. This supply is nom5V dc, and should be provided by a regulated
voltage source capable of sourcing a minimum of 200mA. The +3.3V required for the PCM4222 digital
section and external support logic may be derived from the +5V supply using an onboard linear voltage
regulator (U22). Alternatively, an external regulated VDD supply may be connected via the EXT VDD
terminal of J12. Refer to
Figure 3 for the configuration of jumper JMP5, which is used to select the source
of the VDD power supply.
SBAU124 – December 2006 PCM4222EVM User's Guide 7
Submit Documentation Feedback