Texas Instruments Low-Power, Rail-to-Rail Output, 16-Bit Serial Input DIGITAL-TO-ANALOG CONVERTER PGA2310EVM PGA2310EVM 데이터 시트

2

SBOU012

This section provides an overview of the evaluation module
hardware for setup purposes. Complete schematics at the
end of the data sheet are provided.

The PGA2310-EVM includes a power-supply connector, la-
beled PS on the circuit board. Four locking terminals are
provided for the analog power supplies (VA+ and VA–), a
digital power supply (VD+), and a common ground (GND).
There are two configuration modes for the power supplies:
Three-Supply operation and Two-Supply operation.

In the case of Three-Supply operation, jumper J

1

 is installed,

while jumper J

2

 is open circuit. Separate supplies are re-

quired for VD+, VA+, and VA–. The supplies share a com-
mon ground connection at the GND terminal. Table I shows
the supply configuration details.

VD+

+5V

+4.5V to +5.5V

VA+

+15V

+4.5V to +16V

VA–

–15V

–4.5V to –16V

NOTE: Install jumper at J

1

. Remove jumper from J

2

 (open circuit).

TABLE I. Requirements for Three-Supply Operation.

In the case of Two-Supply operation, jumpers J

1

 and J

2

 are

installed. The J

2

 jumper connects the VA+ terminal to the VD+

terminal, with VA+ providing both the positive analog and
digital supplies. Separate supplies are required for VA+ and
VA–. The supplies share a common ground connection at the
GND terminal. Table II shows the supply configuration details.

VA+

+5V

+4.5V to +5.5V

VA–

–5V

–4.5V to –5.5V

NOTE: Install jumpers at J

1

 and J

2

.

TABLE II. Requirements for Two-Supply Operation.

The evaluation module includes a DB-25 connector, labeled
LPT, which is used to interface the PGA2310-EVM with a PC
parallel (or printer) port. The parallel port is used by the
evaluation module software to communicate with the
PGA2310’s serial interface. An interface cable is supplied as
part of the evaluation module package.

Two 14-pin headers are included on the evaluation module.
They are labeled DATA IN and DATA OUT. The DATA IN
header provides an alternative connection for host communi-
cations with the PGA2310’s serial interface. It also provides
a means for interfacing to another PGA2310-EVM when
using a daisy-chain configuration.

The DATA OUT header is used to connect to the DATA IN
header of another PGA2310-EVM when using a daisy-chain
configuration. Daisy-chain operation is discussed in more
detail under “Dual DUT (or Daisy-Chain) Operation”.

The evaluation module includes RCA jacks for connection to
waveform generators, signal analyzers, and commercial au-
dio equipment. The input jacks are labeled AINL and AINR,
while the output jacks are labeled AOUTL and AOUTR. The
‘L’ and ‘R’ at the end of the reference designators refer to the
left and right audio channels, respectively.

The analog inputs and outputs are unbalanced (referenced
to ground). The analog input or output swing must not
exceed 27Vp-p with 

±

15V analog power supplies, or 7Vp-p

with 

±

5V analog supplies.

The evaluation module contains a loop-back jumper, labeled
SDO R. The purpose of this jumper is to allow read back of
the previously programmed gain register values for one or
more devices. This is helpful when diagnosing problems with
the PC parallel port or host controller communications.

The serial interface is basically a 16-bit serial in, serial out
shift register. The SDI pin is the input, while SDO is the
output. As 16-bits of new data is shifted into the PGA2310,
the previously programmed 16-bits are being shifted out.
This allows the user to read back the values to determine if
the device is being programmed correctly. It also allows
multiple PGA2310 devices to be cascaded, or daisy-chained,
to form a 16 x N-bit long shift register, where N is the number
of devices included in the chain. This arrangement allows a
3-wire interface to program multiple PGA2310 devices con-
nected in a daisy-chain fashion. Daisy-chain operation is
discussed in more detail in “Dual DUT (or Daisy-Chain)
Operation”.

The supplied software will run on personal computers de-
signed for use with Windows 95

®

 and 98.

A CD-ROM drive is required for installation of program files
and access to support documents. Approximately 4MB of
hard disk space is required for installation.

The following procedure assumes familiarity with navigating
the Windows desktop to find folders and files located on
mounted volumes. Should you need assistance with this,
please consult the Windows Help system.

Step 1: Insert the accompanying CD into your CD-ROM
drive.

Step 2: Locate the PGA2310-EVM folder on the CD, using
either My Computer or Windows Explorer.