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dc2622af
DEMO MANUAL DC2622A
Description
ADA4899-1
Rail-to-Rail SAR ADC
Driver Amplifier
Demonstration circuit 2622A features the ADA4899-1
amplifier. The DC2622A includes two of these amplifiers
and is designed to drive the inputs of the DC2290 demo
board. The DC2290 features the
18-bit, 15Msps
high speed SAR ADC. The linearity and low noise of the
ADA4899-1 make it an ideal candidate to drive the LTC2387
at frequencies above 1MHz. See Table 1.
The DC2622A is configured to accept a single-ended in-
put signal and provide unity gain. The board can provide
voltage gain if several component values are changed. For
L
, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Analog
Devices, Inc. All other trademarks are the property of their respective owners.
example, a voltage gain of two will result if the following
changes are made:
Change R23 to 309Ω
Install 309Ω at R27
Install 100pF at C28
Change R18 to 287Ω
Design files for this circuit board are available at
http://www.linear.com/demo/DC2622A
Figure 1. DC2622A Connection Diagram
FROM
SIGNAL SOURCE
FROM DC COMMON
MODE REFERENCE
TO DC2290
–5V
+10V
DC2622 F01
Table 1. DC2290 (LTC2387 Family) Driver Boards
INPUT FREQUENCY
DRIVER BOARD
AMPLIFIER
Up to 8kHz
DC2402
LT6237
Up to 1MHz
DC2403
LT6200
>1MHz
Lowest Noise — DC2622
Lowest Distortion — DC2623
ADA4899-1
LTC6404-1 + AD8002
