cs5364 Cirrus Logic, Inc., cs5364 Datasheet - Page 19

• Manufacturer Part Number: cs5364
• Description: 114 Db, 192 Khz, 4-channel A/d Converter
• Manufacturer: Cirrus Logic, Inc.

DS625F3
4. APPLICATIONS
4.1
4.2
4.2.1 Stand-Alone Mode
4.2.2 Control Port Mode
Power
CS5364 features five independent power pins that power various functional blocks within the device and
allow for convenient interfacing to other devices.
each supply pin. Please refer to
each power supply pin. The power supplied to each power pin can be independent of the power supplied to
any other pin.
To meet full performance specifications, the CS5364 requires normal low-noise board layout. The
Connection Diagram” on page 9
to a clean supply. VD, which powers the digital filter, may be run from the system logic supply, or it may be
powered from the analog supply via a single-pole decoupling filter.
Decoupling capacitors should be placed as near to the ADC as possible, with the lower value high-frequen-
cy capacitors placed nearest to the device leads. Clocks should be kept away from the FILT+ and VQ pins
in order to avoid unwanted coupling of these signals into the device. The FILT+ and VQ decoupling capac-
itors must be positioned to minimize the electrical path to ground.
The CDB5364 evaluation board demonstrates optimum layout for the device.
Control Port Mode and Stand-Alone Operation
In Stand-Alone Mode, the CS5364 is programmed exclusively with multi-use configuration pins. This mode
provides a set of commonly used features, which comprise a subset of the complete set of device features
offered in Control Port Mode.
To use the CS5364 in Stand-Alone Mode, the configuration pins must be held in a stable state, at valid logic
levels, and RST must be asserted until the power supplies and clocks are stable and valid. More informa-
tion on the reset function is available in
In Control Port Mode, all features of the CS5364 are available. Four multi-use configuration pins become
software pins that support the I²C or SPI bus protocol. To initiate Control Port Mode, a controller that sup-
ports I²C or SPI must be used to enable the internal register functionality. This is done by setting the CP-
EN bit (Bit 7 of the Global Control Port Register). Once CP-EN is set, all of the device configuration pins
are ignored, and the internal register settings determine the operating modes of the part.
page 30
provides detailed information about the I²C and SPI bus protocols.
Pin Name
VLC
VLS
VD
VA
VX
Power Supply Pin
Table 1. Power Supply Pin Definitions
shows the recommended power arrangements, with the VA pins connected
“Recommended Operating Conditions” on page 10
Pin Number
Section 4.5 on page
4, 9
20
33
28
35
Table 1
shows what portion of the device is powered from
Serial Audio Interface
Functional Block
Crystal Oscillator
22.
Control Logic
Analog Core
Digital Core
for the valid range of
Figure 4.13 on
CS5364
“Typical
19