Linear Technology DC2025A Demo Manual

DESCRIPTION
Demonstration circuit 2025A features the
16-channel 16-Bit/12-Bit ±10V V
10ppm/°C max reference in a 6mm × 6mm QFN package.
This device features per-channel SoftSpan configuration
with five output ranges: 0V to 5V, 0V to 10V, ±2.5V, ±5V,
and ±10V. A toggle feature allows any or all DACs to switch
between two programmed codes via a single SPI command
or by the TGP input pin. The versatile SPI interface can
operate on any logic level between 1.71V and 5.5V, for
easy interface to lower voltage microcontrollers or FPGAs.
ANALOG SUPPLIES
(±15V ALLOWS ALL
SOFTSPAN RANGES)
+
–
+
–
±10V V
LTC 2668,
®
SoftSpan™ DACs with
OUT
OVERTEMPERATURE SEE TEXT. LDAC, TGP , CLR
OUTPUT PULLED TO OVP W/5k
Figure 1. Connection Diagram
DEMO MANUAL DC2025A
16-Channel 16-Bit/12-Bit
SoftSpan DACs with
OUT
10ppm/°C Max Reference
DC2025A-A is populated with the 16-bit version of the
LTC2668. DC2025A-B is populated with the 12-bit version
for lower resolution applications.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2025A
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
SoftSpan and QuikEval are trademarks of Analog Devices, Inc. All other trademarks are the
property of their respective owners.
MEASURE REF VOLTAGE,
DAC
MUX OUTPUT
OUTPUTS
DAC
OUTPUTS
SIGNAL
GROUND
DAC
OUTPUTS
SIGNAL
GROUND
dc2025afa
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