adc1220 austriamicrosystems, adc1220 Datasheet - Page 11

• Manufacturer Part Number: adc1220
• Description: Cmos 12-bit Pipelined A/d Converter
• Manufacturer: austriamicrosystems

Datasheet : ADC1220 – C35
1)
2)
3)
4)
Revision B, 08.09.02
TYPICAL APPLICATION
The ADC1220 is targeted for general purpose sampling ADC
functions where high-speed conversion rates and medium
precision are of critical importance.
The value of the capacitor depends on the input frequency.
For SMD capacitors use the type NPO and for normal capacitors use the type MKT for best performance.
The accuracy of both reference voltages must be higher than the retion of the ADC. In typical applications both
The accuracy of both input voltages must be higher than the resolution of the ADC. In typical applications both
For SMD capacitors use the type NPO and for normal capacitors use the type MKT for best performance.
voltages are filtered by a second order low pass filter (f
voltages are filtered. For low inncies the input voltages are buffered with a AD8138 and for high
frequencies a transformer is used.
2.4V
CPK2
CPK2
CPK1
3)
CPK2
3.3uF
2)
3.3uF
10uF
100nF
2)
2)
Configuration: Op. Mode 4 at 20 MS/sec, 3 Vpp input signal range
100nF
100nF
2)
CPK2
0.9V
100pF
2)
2)
Configuration: Op. Mode 1 at 20 MS/sec, 2 Vpp input signal range
3)
100pF
2)
100pF
2)
CPK2
2)
CPK1
c
1.65V
10uF
= 5 Hz) and buffered with an AD711.
+3.3V
VSSA
1.65V
2)
4)
CPK1
VIN
VDDA
4)
100nF
CPK2
VIN
4)
CPK2
4)
2)
200pF
100pF
200pF
1)2)3)4)
1)
2)
200pF
+3.3V
VSSD
1)
CPK1
200pF
1)
VDDD
+3.3V
VSSA
1)
CPK1
VDDA
APPLICATION
!
!
!
!
!
1.25V
3)
Video
Imaging
Data acquisition systems
High-speed data transmission
Communications
CPK2
+3.3V
VSSD
CPK1
VDDD
20MHz
VDDD
VDDD
20MHz
VSSA
VDDA
VSSA
GROUND
VDDA
VDDD
GROUND
VDDD
VSSD
VSSD
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10uA
CPK2