CDB5451 Cirrus Logic Inc, CDB5451 Datasheet - Page 6

• Manufacturer Part Number: CDB5451
• Description: Development Kit
• Manufacturer: Cirrus Logic Inc

Specifications of CDB5451

• Silicon Manufacturer: Cirrus Logic
• Application Sub Type: ADC
• Kit Application Type: Data Converter
• Silicon Core Number: CS5451
• Features: RS-232 Serial Communication With PC, Noise Histogram Analysis, FFT Analysis
• Kit Contents: Evaluation Board And Software
• Rohs Compliant: No
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

supply, the “VD+” banana connector post can be
used to independently supply a separate digital
power supply to the input of the CS5471 (VD+
pin), the 4.096 MHz oscillator (U1), and circuitry
for the parallel port interface. This is controlled by
the setting on HDR18.
The user should note that the CS5471 can operate
with a digital supply voltage of either +3V or +5V.
This voltage is defined as the voltage presented
across VD+ and DGND.
2.2.3 Charge Pump Options
The output from CS5471’s charge-pump driver pin
(CPD) can be used to generate a -2V supply when
the proper jumper settings are selected on HDR9.
This -2V supply can be used as the negative power
supply connection for the CS5471’s VA- pin. Re-
6
Analog
Power Supplies
+3
+3
+3
+3
+3
+3
+3
+3
+3
+3
+5
Digital
+3
+3
+3
+3
+3
+3
+5
+5
+5
+5
+3
NC
NC
NC
NC
A+
+3
+3
+3
+3
+3
+3
+5
Power Post Connections
NC
NC
NC
NC
NC
A-
-2
-2
-2
-2
-2
0
Table 1. Power Supply Connections
GND
+2
0
0
0
0
0
0
0
0
0
0
NC
NC
NC
NC
D+
+3
+3
+5
+5
+5
+5
+5
ferring to Figure 1, circuitry for a charge-pump cir-
cuit is included on-board. The charge pump circuit
consists of capacitors C11, C12, and C36, and di-
odes D1 and D2.
As an alternative to using the charge pump circuit,
the user can supply an off-board -2V DC power
source to the “A-” banana connector. This option
is controlled by the setting on HDR9.
2.3 Eval Board Control - Headers/Switches
Table 2 lists the various adjustable headers and
switches on the CDB5471 Evaluation Board, as
well as their default settings (as shipped from the
factory). The header settings can be adjusted by the
user to select various options on the evaluation
board. These options are described further in the
following paragraphs.
+5 V_IN
NC
NC
NC
NC
NC
NC
NC
+5
+5
+5
+5
CPD
CPD
CPD O
CPD O
CPD
CPD O
CPD
CPD O
CPD
CPD O
CPD
A-
A-
A-
A-
A-
A-
A-
A-
A-
A-
A-
HDR9
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
+5V_IN
+5V_IN
+5V_IN
+5V_IN
+5V_IN
+5V_IN
+5V_IN
+5V_IN
+5V_IN
+5V_IN
+5V_IN
A+
A+
A+
A+
A+
A+
A+
A+
A+
A+
A+
HDR17
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
CDB5471
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
DS480DB1
VD+
V+
VD+
V+
VD+
V+
VD+
V+
VD+
V+
VD+
V+
VD+
V+
VD+
V+
VD+
V+
VD+
V+
VD+
V+
HDR18
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O