DC1074A - Demo Manual

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT DC1074
LTC2630 FAMILY OF SINGLE SPI DACS
LTC2630
DESCRIPTION
Demonstration circuit 1074 features the LTC2630
family of 12 bit DACs. This device establishes a new
benchmark for size and integration of 12 bit DACs
and onboard reference. Four DACs are included:
LTC2630HZ (4.096V reference, reset to zero)
LTC2630HM (4.096V reference, reset to midscale)
LTC2630LZ (2.5V reference, reset to zero)
LTC2630LM (2.5V reference, reset to midscale)
DC1074 may be connected directly to the target application’s analog signals while using the DC590 USB
Serial Controller board and supplied software to
measure performance. After evaluating with Linear
Technology’s software, the digital signals can be
connected to the end application’s processor / controller for development of the serial interface.
Design files for this circuit board are available.
Call the LTC factory.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Figure 1. Proper Measurement Equipment Setup
Ribbon
cable To
DC590
Controller
DAC outputs
Table 1. LTC2630 Performance Summary, AHM / AHZ versions (Vfs = 4.096V)
PARAMETER
CONDITION
Resolution
VALUE
12 BITS
Monotonicity
Vcc = 5V, Vref = internal
12 BITS
Differential Nonlinearity
Vcc = 5V, Vref = internal
+/-1 LSB
Integral Nonlinearity
Vcc = 5V, Vref = internal
+/-0.5 LSB Typical
Load Regulation
Vout = Midscale, Iout = +/- 5 mA
0.1 LSB/mA
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QUICK START GUIDE FOR DEMONSTRATION CIRCUIT DC1074
LTC2630 FAMILY OF SINGLE SPI DACS
QUICK START PROCEDURE
Connect DC1074 to a DC590 USB serial controller
using the supplied 14 conductor ribbon cable. Connect DC590 to a host PC with a standard USB A/B
cable. Run the evaluation software supplied with
DC590 or download it from www.linear.com. The
correct control panel will be loaded automatically.
Options are available to display the DAC output in
Voltage, hex code, or decimal count. Additionally,
the supply or internal reference voltage may be
changed to reflect an actual measured value such
that the output voltage matches the theoretical output voltage. The reference mode may be changed
from internal reference to supply as reference.
Figure 2. Software Screenshot
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QUICK START GUIDE FOR DEMONSTRATION CIRCUIT DC1074
LTC2630 FAMILY OF SINGLE SPI DACS
HARDWARE SET-UP
JUMPERS
4.096V DAC VCC – Select the supply for the H
DACs, either 5V (default) or supplied externally to
the turret post.
2.5V DAC VCC – Select the supply for the L DACs,
either 5V, 3.3V (default) or supplied externally to
the turret post. (remove jumper.)
ANALOG CONNECTIONS
DAC outputs are provided on the row of turret posts
at the edge of the board.
GROUNDING AND POWER CONNECTIONS
Power (Vcc) – Normally DC1074 is powered by the
DC590 controller. Vcc can be supplied to the 5V
turret, however the power supply on DC590 must
be disabled! Refer to DC590 Quick Start Guide for
more details on this mode of operation.
Grounding – Four ground posts are provided. Exposed ground planes at the edges of the board are
also provided for optimum grounding to other circuits.
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QUICK START GUIDE FOR DEMONSTRATION CIRCUIT DC1074
LTC2630 FAMILY OF SINGLE SPI DACS
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