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dc2197afa
DEMO MANUAL DC2197A
Description
Quad 12-/10-/8-Bit
PWM to VOUT DACs
with 10ppm/°C Reference
Demonstration circuit 2197A features the
LTC
®
2645
,
Quad 12-/10-/8-Bit PWM to VOUT DACs with 10ppm/°C
reference in a tiny 4.9mm
×
4mm 16-lead MSOP package.
DC2197A-A is populated with the 2.5V, 12-bit version of
the LTC2645.
The LTC2645 measures the period and pulse width of the
Pulse Width Modulation (PWM) input and updates the volt-
age output DAC at each rising edge. The PWM frequency
can be any frequency between 30Hz and 100kHz. The input
L
, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
BoarD photo
level can be between 1.71V and 5.5V, set by a separate
IOVCC pin. This device solves many of the problems as-
sociated with filtering a PWM signal to produce an analog
voltage, producing a fast-settling, accurate analog voltage
in response to a digital PWM input.
Design files for this circuit board are available at
http://www.linear.com/demo
Figure 1. Basic Connections
ANALOG
OUTPUTS
HEADERS ON REVERSE SIDE ARE FOR
OPERATION WITH A LINDUINO BOARD.
(SEE TEXT)
POWER-DOWN, REFERENCE
CONNECTIONS (SEE TEXT)
PWM
INPUTS
OPTIONAL LOGIC
SUPPLY CONNECTION
1.71V TO 5.5V (SEE TEXT)
VCC CONNECTION
2.7V TO 5.5V (SEE TEXT)
IOVCC
0
