Linear Technology LTC2270, Демонстрационное руководство

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dc1975fa
DEMO MANUAL DC1975A
DESCRIPTION
LTC2270
16-Bit, 20Msps Dual ADC
Demonstration circuit 1975A supports the LTC
®
2270 high
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
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.
PERFORMANCE SUMMARY
DC1975 VARIANTS
data sheet for proper input networks for different input
frequencies.
Design files for this circuit board are available at
http://www.linear.com/demo
PARAMETER CONDITIONS MIN TYP MAX UNITS
Supply Voltage: DC1975A Depending on Sampling Rate and the A/D Converter
Provided, This Supply Must Provide Up to 300mA
4.5 6 V
Analog Input Range Depending on SENSE Pin Voltage 1 2.1 V
P-P
Logic Input Voltages Minimum Logic High
Maximum Logic Low
1.3
0.6
V
V
Sampling Frequency (Convert Clock
Frequency)
1 20 Msps
Convert Clock Level Single-Ended Encode Mode (ENC– Tied to GND) 0 3.6 V
Convert Clock Level Differential Encode Mode (ENC– Not Tied to GND) 0.2 3.6 V
Resolution 16
Input Frequency Range DC 70 MHz
DC1975 VARIANTS ADC PART NUMBER RESOLUTION MAXIMUM SAMPLE RATE INPUT FREQUENCY
1975A LTC2270 16-Bit 20Msps DC to 70MHz
Specifications are at T
A
= 25°C