CDB4265 Cirrus Logic Inc, CDB4265 Datasheet - Page 51

• Manufacturer Part Number: CDB4265
• Description: BOARD EVAL FOR CS4265 CODEC
• Manufacturer: Cirrus Logic Inc

Specifications of CDB4265

• Main Purpose: Audio, CODEC
• Embedded: No
• Utilized Ic / Part: CS4265
• Primary Attributes: Stereo, 24-Bit, 192 kHz Sample Rate
• Secondary Attributes: Graphic User Interface, S/PDIF/ I2S / I2C / SPI Interface
• Description/function: Audio CODECs
• Operating Supply Voltage: 5 V
• Product: Audio Modules
• For Use With/related Products: CS4265
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Contains lead / RoHS non-compliant
• Other names: 598-1001

DS657F2
10.EXTERNAL IEC60958-3 TRANSMITTER COMPONENTS
This section details the external components required to interface the IEC60958-3 transmitter to cables and fiber-
optic components.
10.1
10.2
IEC60958-3 Transmitter External Components
The IEC60958-3 specifications call for an unbalanced drive circuit with an output impedance of 75 Ω ± 20%
and an output drive level of 0.5 volts peak-to-peak ±20% when measured across a 75 Ω load using no cable.
The circuit shown in
sistors. If VD is driven from +3.3 V, use resistor values of 243 Ω in place of the 374 Ω resistor and a 107 Ω
resistor in place of the 90.9 Ω resistor. The standard connector for a consumer application is an RCA phono
socket.
The TXOUT pin may be used to drive TTL or CMOS gates as shown in
for optical connectors for digital audio as they typically implement TTL or CMOS compatible inputs. This cir-
cuit is also useful when driving multiple digital audio outputs as RS422 line drivers typically implement TTL
compatible inputs.
Isolating Transformer Requirements
Please refer to Cirrus application note AN134: AES and SPDIF Recommended Transformers for resources
on transformer selection.
Figure 42
Figure 42. Consumer Output Circuit (VD = 5 V)
CS4265
CS4265
provides the proper output impedance and drive level using standard 1% re-
Figure 43. TTL/CMOS Output Circuit
TXO UT
TXOUT
90.9 Ω
374-R
TXP
TTL or
CMOS Gate
Figure
R C A
P hon o
43. This circuit may be used
CS4265
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