adc-228 C&D Technologies., adc-228 Datasheet - Page 3

• Manufacturer Part Number: adc-228
• Description: 8-bit, 20mhz, Complete Flash A/d Converter
• Manufacturer: C&D Technologies.

TECHNICAL NOTES
1. Rated performance requires using good high-frequency
2. Bypass all the analog and digital supplies and the +5V
techniques. The analog and digital ground pins are
connected to each other internally. Avoid ground related
problems by connecting the grounds to one point, the
ground plane beneath the converter. Due to the
inductance and resistance of the power supply return
paths, return the analog and digital ground separately to
the power supplies.
REFERENCE (pin 3) to ground with a 4.7µF, 25V
tantalum electrolytic capacitor in parallel with a 0.1µF
ceramic capacitor.
®
®
9
9
Figure 3. ADC-228A Typical Connections
Figure 2. ADC-228A Timing Diagram
3
ANALOG
Pin 12
Table 1. ADC-228A Unipolar Output Coding
+4.96V
+3.75V
+2.50V
+1.25V
+0.02V
INPUT
CS2
0.00V
0
0
1
1
Table 2. Chip Select Truth Table
Pin 11
CS1
+FS – 1 LSB
0
1
0
1
+ 3/4 FS
+ 1/2 FS
+ 1/4 FS
+ 1 LSB
CODE
ZERO
Three State Mode
Three State Mode
Data Outputted
Three State Mode
Bits 1-8
STRAIGHT BIN.
1100 0000
1000 0000
0100 0000
0000 0001
0000 0000
1111 1110
ADC-228A