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ADC-318 データシート(PDF) 3 Page - Murata Power Solutions Inc.

部品番号 ADC-318
部品情報  8-Bit, 120MHz and 140MHz Full-Flash A/D Converter
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メーカー  MURATA-PS [Murata Power Solutions Inc.]
ホームページ  http://www.murata-ps.com
Logo MURATA-PS - Murata Power Solutions Inc.

ADC-318 データシート(HTML) 3 Page - Murata Power Solutions Inc.

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the characteristic impedance of all input/output logic and
analog input lines be properly matched.
2. Power supply lines and grounding may effect the perfor-
mance of the ADC-318 and ADC-318A. Separate and
substantial AGND and DGND ground planes are required.
These grounds have to be connected to one earth point
underneath the device. There are three digital grounds,
DGND1 (pin 29), DGND2 (pins 20, 32, 41) and DGND3 (pin
12). These DGND 's are separated internally. DGND1 and
DGND2 are always connected externally but DGND3 shall
be connected differently depending on whether the single or
dual power supply mode is used, as explained later.
The ADC-318 and ADC-318A have separate +AVs and
+DVs pins. It is recommended that both +AVs and +DVs
be powered from a single source. Other external digital
circuits must be powered with a separate +DVs. Layouts of
+AVs and +DVs lines must be separated like the GND lines
to avoid mutual interference and are connected to a point
through an LC filter. There are two digital supplies +DVs1
(pin 30) and +DVs2 (pins 19, 31, 42). These are also sepa-
rated internally. These must be tied together outside while
in use. Bypassing all power lines with a 0.1uF ceramic chip
capacitor and the use of multilayered PC boards is recom-
mended.
3. The analog input terminal (pin 6) has 21pF of input capaci-
tance. The input signal has to be given via a buffer amplifier
which has enough driving power. Make lead wires as short
as possible and use chip resistors and capacitors to avoid
parasitic capacitance and inductance.
4. The use of a buffer amplifier and bypass capacitors is also
recommended on the reference input terminals VRT (pin 11)
and VRB (pin 2). The analog input range is determined by
POWER REQUIREMENTS (cont.)
Power Dissipation
ADC-318
680
780
980
mW
ADC-318A
570
790
960
mW
PARAMETERS
Operating Temp. Range, Case
ADC-318, 318A
–20
+75
°C
Thermal Impedance
ja
62.5
°C/Watt
Storage Temperature Range
–65
+150
°C
Package Type
48-pin, plastic QFP
Weight
0.25 ounces (0.7 grams)
Footnotes:
VIN = +3V +0.07Vrms
VIH = DGND3–0.8V
VIL = DGND3–1.6V
VIH = 3.5V
VIL = 0.2V
TTL, 0.8 to 2.0V, CL = 5pF
DMUX Mode, CL = 5pF; FC = Clock
frequency
Straight Mode, CL = 5pF
CL = 5pF
VIN = FS, DMUX mode
VIN = FS, DMUX mode, Error >16LSB
VIN = FS, Straight mode, Error >16LSB
"Times Per Sample"
Mounted on 50x50mm, 1.6mm thick
glass fiber base epoxy board
TECHNICAL NOTES
1. The ADC-318 and ADC-318A are ultra high speed full flash
A/D converters that have 120MHz and 140MHz sampling
rates respectively. The ADC-318 and ADC-318A are fully in-
terchangeable products with the exception of their sampling
rates. Their inputs are TTL, ECL and PECL compatible and
their outputs are TTL compatible. Obtaining fully specified
performance from the ADC-318 and ADC-318A requires that
12
11
12
Figure 2-1: One Power Supply Operation (TTL, PECL)
Figure 2-2: Two Power Supply Operation (ECL)
Note: All capacitors not otherwise designated are 0.1μF
+
+
+
+
5V(A)
5V(D)
8
5
19
30 31
42
2
VRB
+2V
ANALOG IN
+2V to +4V
4
6
7
9
11
VRT
+4V
A/D CLOCK
15
13
14
48
47
46
310
20
29
32
41
45
44
43
TTL
CLOCK OUT
5V(D)
28 B BIT 1
27 B BIT 2
26 B BIT 3
25 B BIT 4
24 B BIT 5
23 B BIT 6
22 B BIT 7
21 B BIT 8
LSB
MSB
40 A BIT 1
39 A BIT 2
38 A BIT 3
37 A BIT 4
36 A BIT 5
35 A BIT 6
34 A BIT 7
33 A BIT 8
LSB
MSB
12
1
5V(D)
+
+
+
+
+
5V(A)
5V(D)
8
5
19
30 31
42
2
VRB
+2V
ANALOG IN
+2V to +4V
4
6
7
9
11
VRT
+4V
ECL
A/D CLOCK
A/D CLOCK
15
13
14
48
47
46
310
112
20
29
32
41
5V(D)
45
44
43
TTL
CLOCK OUT
28 B BIT 1
27 B BIT 2
26 B BIT 3
25 B BIT 4
24 B BIT 5
23 B BIT 6
22 B BIT 7
21 B BIT 8
LSB
MSB
40 A BIT 1
39 A BIT 2
38 A BIT 3
37 A BIT 4
36 A BIT 5
35 A BIT 6
34 A BIT 7
33 A BIT 8
LSB
MSB
5V(D)
5V(D)
ADC-318, ADC-318A
8-Bit, 120MHz and 140MHz Full-Flash A/D Converter
MDA_ADC-318.B01 Page 3 of 8
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
www.murata-ps.com


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