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ADC-228AMM Datasheet(PDF) 3 Page - Murata Power Solutions Inc.

No. de pieza ADC-228AMM
Descripción Electrónicos  8-Bit, 20MHz, Complete Flash A/D Converter
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Fabricante Electrónico  MURATA-PS [Murata Power Solutions Inc.]
Página de inicio  http://www.murata-ps.com
Logo MURATA-PS - Murata Power Solutions Inc.

ADC-228AMM Datasheet(HTML) 3 Page - Murata Power Solutions Inc.

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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.
ANALOG INPUT
CODE
STRAIGHT BIN.
+4.96V
+FS – 1 LSB
1111 1110
+3.75V
+ 3/4 FS
1100 0000
+2.50V
+ 1/2 FS
1000 0000
+1.25V
+ 1/4 FS
0100 0000
+0.02V
+ 1 LSB
0000 0001
0.00V
ZERO
0000 0000
Table 1. ADC-228A Unipolar Output Coding
Table 2. Chip Select Truth Table
CS2
Pin 12
CS1
Pin 11
Bits 1-8
0
0
Three State Mode
0
1
Three State Mode
1
0
Data Outputted
1
1
Three State Mode
Figure 2. ADC-228A Timing Diagram
SAMPLE
N + 2
SAMPLE
N + 1
SAMPLE
N
OUTPUT
HOLD TIME
DATA
N
DATA
N + 1
DATA
N + 2
CLOCK
DIGITAL
OUTPUT
OUTPUT
DELAY
Figure 3. ADC-228A Typical Connections
24
23
B8 (LSB)
B7
9k
Ω
51
Ω
19
VIN 5
+15V
*Optional
+
2, 4, 6, 7
+5V REFERENCE OUT
NO CONNECTION
3
8, 9, 13, 20
22
B6
21
B5
17
B4
16
B3
CS1 12
CLOCK 18
ANALOG
INPUT
15
B2
14
+
+
B1 (MSB)
4.7μF
0.1μF
10
1
–15V
+5V
CS1 11
* Use optional resistor only if
amp is not used to drive input.
ADC-228A
+
0.1μF
0.1μF
0.1μF
4.7μF
4.7μF
4.7μF
EE
R = V /1.667mA
ADC-228A
8-Bit, 20MHz, Complete Flash A/D Converter
MDA_ADC-228A.B01 Page 3 of 4
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
www.murata-ps.com


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