Linear Technology DC1444A Manuel utilisateur

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1444A

1-CHANNEL/2-CHANNEL, 12-BIT, SAR ADCS WITH I

C INTERFACE

DESCRIPTION

LTC2301/LTC2305

Demonstration circuit 1444A features the

LTC2301/LTC2305, low noise, low power, 1-

Channel/2-Channel, 12-Bit, successive

approximation ADCs with an I

C compatible

serial interface. The LTC2301/LTC2305 are

available in a 12-pin MSOP package.

DC1444A demonstrates the DC performance

of the LTC2301/LTC2305 ADCs in

conjunction with the DC590B Quick Eval

data collection board. Alternatively, by

connecting the DC1444A into a customer

application the performance of the

LTC2301/LTC2305 can be evaluated directly

in that circuit. DC1444A-A uses

LTC2301CMS.

DC1444A-B uses LTC2305CMS.

Design files for this circuit board are available.

Call the LTC factory.

LTC is a trademark of Linear Technology Corporation

FIGURE 1. DC1444A CONNECTION DIAGRAM

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1444A

1-CHANNEL/2-CHANNEL, 12-BIT, SAR ADCS WITH I

C INTERFACE

DC590B QUICK START PROCEDURE

Connect DC1444A to a DC590B USB serial

controller using the supplied 14-conductor ribbon

cable. Make sure the VCCIO jumper of the

DC590B is in the 5V position. Connect DC590B

to a host PC with a standard USB A/B cable.

Apply analog input voltage to IN+ and IN- (CH0

and CH1 for LTC2301) on connector JP1. Run the

evaluation software supplied with DC590B or

download it from www.linear.com. The correct

control panel will be loaded automatically. Click

the COLLECT/PAUSE (Figure 2) button to begin

reading the ADC. Pressing COLLECT/PAUSE

again stops data collection. The Help menu

contains information on Data Logging the ADC

results. The Tools menu has the Data Logging

option as well as options for changing the number

of points displayed, the number of points in an

average and whether the data is displayed in LSBs

or Volts. The View menu can be used to access

the LTC2301/LTC2305 product page.

If the Quick Eval program is started without the

demo board attached to DC590B, the Tools menu

can be used to check for updates and automatically

install them. DC1444A requires at least version

K76 of the Quick Eval software.

HARDWARE SET UP

SIGNAL CONNECTIONS

See Figure 1 for locations.

JP1 Connector for IN+/IN- LTC2301 (CH0-

CH1 LTC2305), COM and BIAS/2. Limit input

voltage swings to GND-VDD. For optimum

performance, the input should be bandlimited to

the frequencies of interest.

JP2 DC590 interface connector. Provides power

and I2C interface to DC1444A.

JP3 AD1 I

C address line. Set to GND for

operation with supplied software.

JP4 AD0 I

C address line. Set to GND for

operation with supplied software.

JP5 BIAS Selects between Refcomp and an

external bias voltage to drive the Bias/2 line.

Bias/2 is designed to set a center point for the

minus input during bipolar operation.

EXT_BIAS External Bias connection. This can

be used to drive the BIAS/2 line through a 2:1

divider. To use this pin put jumper JP5 in the EXT

position and apply desired bias voltage.

5V Five volt supply line for DC1444A. Power is

normally provided to this line by DC590B. Apply

power to this line only if DC590B is not used.

GND Ground line for DC1444A

SDA I

C bidirectional data line. Controlled by

DC590B if connected.

SCL I

C clock line. Controlled by DC590B if

connected.

VREF Connected to ADC Vref pin through 50

ohm resistor.

REFCOMP Connected to ADC Refcomp pin.

BIAS/2 Bias voltage/2 (Refcomp or Ext)

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1444A

1-CHANNEL/2-CHANNEL, 12-BIT, SAR ADCS WITH I

C INTERFACE

USING DC1444A WITHOUT DC590

Interface signals SDA and SCL and power are

normally provided to DC1444A by DC590. If you

use this board without DC590, it is the user’s

responsibility to connect a 5V power supply and

ground as well as generating SDA and SCL. These

signals can be provided through the 14-pin ribbon

cable connector. See schematic for pin out. See

LTC2301/LTC2305 Data Sheet for information on

driving SDA and SCL.

Figure 2. DC1444A-A Quick Eval Screenshot

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1444A

1-CHANNEL/2-CHANNEL, 12-BIT, SAR ADCS WITH I

C INTERFACE

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