ADC-228AMC データシートの表示（PDF） - Murata Power Solutions
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ADC-228AMC Datasheet PDF : 4 Pages
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TECHNICAL NOTES
1. Rated performance requires using good high-frequency 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.
2. Bypass all the analog and digital supplies and the +5V REFERENCE (pin 3) to ground with a
4.7µF, 25V tantalum electrolytic capacitor in parallel with a 0.1µF ceramic capacitor.
Table 1. ADC-228A Unipolar Output Coding
ANALOG INPUT
+4.96V
+3.75V
+2.50V
+1.25V
+0.02V
0.00V
CODE
+FS – 1 LSB
+ 3/4 FS
+ 1/2 FS
+ 1/4 FS
+ 1 LSB
ZERO
STRAIGHT BIN.
1111 1110
1100 0000
1000 0000
0100 0000
0000 0001
0000 0000
ADC-228A
8-Bit, 20MHz, Complete Flash A/D Converter
Table 2. Chip Select Truth Table
CS2
Pin 12
0
0
1
1
CS1
Pin 11
0
1
0
1
Bits 1-8
Three State Mode
Three State Mode
Data Outputted
Three State Mode
CLOCK
DIGITAL
OUTPUT
SAMPLE
N
DATA
N
SAMPLE
N+1
OUTPUT
DELAY
DATA
N+1
SAMPLE
N+2
OUTPUT
HOLD TIME
Figure 2. ADC-228A Timing Diagram
DATA
N+2
ANALOG
INPUT
51Ω
+5V
0.1μF
–15V
0.1μF
4.7μF +
CS1 11
CS1 12
CLOCK 18
VIN 5
9kΩ
*Optional
1
10
ADC-228A
19
2, 4, 6, 7
0.1μF
4.7μF +
14
B1 (MSB)
15
B2
16
B3
17
B4
21
B5
22
B6
23
B7
24
B8 (LSB)
8, 9, 13, 20
NO CONNECTION
3
+5V REFERENCE OUT
+
4.7μF
0.1μF
* Use optional resistor only if
amp is not used to drive input.
R = VEE /1.667mA
+
4.7μF
+15V
Figure 3. ADC-228A Typical Connections
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MDA_ADC-228A.B01 Page 3 of 4
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