Evaluation Board Hardware; Power Supply Connectors; Input Connectors; Output Connectors - Analog Devices EVAL-ADAU1977 User Manual

Evaluation Board User Guide

EVALUATION BOARD HARDWARE

The EVAL-ADAU1977Z board is common for the ADAU1977,
ADAU1978, and ADAU1979. The evaluation board is designed
as a 4-layer printed circuit board (PCB). The top and bottom
layers are for signals, whereas Layer 2 and Layer 3 are used as
ground and a power plane, respectively. The PCB layout is
important to achieve good audio performance. The following
sections offer useful guidelines for operation of the board.

POWER SUPPLY CONNECTORS

The EVAL-ADAU1977Z board requires +5 V for the
ADAU1978 and ADAU1979
for testing the 10 V rms inputs of the ADAU1977. Connect the
5 V power supply at J5 and J4. Connect the ±20 V power supply
at either TP3 (+20 V) or TP1 (−20 V). The +5 V power supply
must be capable of providing a 1 A current rating, and the
±20 V power supply must be capable of providing at least a
100 mA current rating. When the diagnostics feature is not
used, the ±20 V supply is not required.

INPUT CONNECTORS

The EVAL-ADAU1977Z has five 3.5 mm audio jack connectors
for analog inputs: J9, J17, J28, J38, and J47. The J9 connector is
used for generating line level inputs capable of 10 V rms, with a
common-mode level of 7 V for the ADAU1977. The J17, J28,
J38, and J47 connectors are used as Channel 1, Channel 2,
Channel 3, and Channel 4 line level inputs to the ADC,
respectively. All five inputs are differential.
Table 1. Jumper Descriptions
Component No. Mnemonic
J1 MICBIAS SELECT AUX IN
J2 CM SELECT AUX IN
J4 GND
J5 +5V
J8 USBi
J9 AUX IN
J10 IOVDD
J11 IOVDD Ext/Int
J12 VBAT Ext/Int
J13 3.3 V Ext/Int
J14 AVDD Ext/Int
J15/J20 Input 1 Select
J16 AVDD Current
J17 CH1 Input
J19 Input Short
J21 Boost Current
J22 MICBIAS-CH1
J24 Boost Switch
J25 ADC Output
J26 ADC Output Buffered
J27/J30 Input 2 Select
J28 CH2 Input
J29 Input Short
and may need an additional ±20 V
Description
This jumper allows selecting either internal or external micbias for auxiliary input.
Used for setting the common mode level for auxiliary input.
Ground or 0 V connection for the power supply.
+5 V connection for the power supply.
Connector for USBi board.
Connector for auxiliary input.
Selects the IOVDD 1.8 V or 3.3 V.
Selects the internal or external supply for IOVDD.
Selects the internal or external supply for VBAT.
Selects the internal or external 3.3 V supply.
Selects the internal or external AVDD supply for the ADAU1977.
Selects the input source for Channel 1.
This jumper is used to measure the AVDD current.
Connector for Channel 1 input.
This jumper is used to short the ± Channel 1 input.
This jumper is used to measure the boost converter current.
Selects the internal or external micbias for Channel 1.
This jumper is used to measure the boost switch current.
Header for connection to ADC digital pins.
Header for ADC digital output.
Selects the input source for Channel 2.
Connector for Channel 2 input.
This jumper is used to short the ± Channel 2 input.

OUTPUT CONNECTORS

The ADC digital output is available at J25 (unbuffered) and J26
(buffered). In addition, ADC digital output is available as a
2-channel Sony Philips digital interface format (SPDIF). J25 and
J26 are used for I
digital output. The U16 provides the SPDIF optical output, and
J35 provides the SPDIF coaxial output.
I 2 C/SPI CONTROL CONNECTOR
The J8 (10-way header) can be used for I
communication for controlling the board. The supplied USB
interface board can be used for setting the device. The graphic
user interface (GUI) software is used along with the USB
interface board.

JUMPERS

The EVAL-ADAU1977Z
board into various operating modes.
Rev. 0 | Page 3 of 27
2 S or time division multiplex (TDM), serial
2 C/SPI serial port
board provides jumpers for setting this
UG-600