Linear Technology LTC2270 Demo Manual

DESCRIPTION
Demonstration circuit 1975A supports the
speed, high dynamic range ADC. It was specially designed
for applications that require differential DC inputs. DC1975
supports the LTC2270 in CMOS output mode.
The circuitry on the analog inputs is optimized for ana-
log input frequencies from DC to 70MHz. Refer to the
DC1975 VARIANTS
DC1975 VARIANTS
1975A
PERFORMANCE SUMMARY
PARAMETER
Supply Voltage: DC1975A
Analog Input Range
Logic Input Voltages
Sampling Frequency (Convert Clock
Frequency)
Convert Clock Level
Convert Clock Level
Resolution
Input Frequency Range
LTC 2270 high
®
ADC PART NUMBER
LTC2270
Specifications are at T
CONDITIONS
Depending on Sampling Rate and the A/D Converter
Provided, This Supply Must Provide Up to 300mA
Depending on SENSE Pin Voltage
Minimum Logic High
Maximum Logic Low
Single-Ended Encode Mode (ENC– Tied to GND)
Differential Encode Mode (ENC– Not Tied to GND)
DEMO MANUAL DC1975A
16-Bit, 20Msps Dual ADC
data sheet for proper input networks for different input
frequencies.
Design files for this circuit board are available at
http://www.linear.com/demo
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and PScope
and QuikEval are trademarks of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
RESOLUTION MAXIMUM SAMPLE RATE
16-Bit
= 25°C
A
LTC2270
INPUT FREQUENCY
20Msps DC to 70MHz
MIN TYP MAX
4.5 6
1 2.1
1.3
0.6
1 20
0 3.6
0.2 3.6
16
DC 70
UNITS
V
V
P-P
V
V
Msps
V
V
MHz
dc1975fa
1