Analog Devices Linear Technology DC2622A Demo Manual

Description

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
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
SIGNAL SOURCE
FROM DC COMMON
MODE REFERENCE
Table 1. DC2290 (LTC2387 Family) Driver Boards
INPUT FREQUENCY
Up to 8kHz
Up to 1MHz
>1MHz
Arrow.com.
Downloaded from
LTC 2387 18-bit, 15Msps
®
FROM
Figure 1. DC2622A Connection Diagram
DEMO MANUAL DC2622A
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
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.
–5V +10V
DRIVER BOARD
DC2402
DC2403
Lowest Noise — DC2622
Lowest Distortion — DC2623
ADA4899-1
Rail-to-Rail SAR ADC
Driver Amplifier
TO DC2290
DC2622 F01
AMPLIFIER
LT6237
LT6200
ADA4899-1
LTC6404-1 + AD8002
dc2622af
1