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ADC-305 데이터시트(PDF) 2 Page - List of Unclassifed Manufacturers

부품명 ADC-305
상세설명  8-Bit, 20MHz CMOS A/D Converters
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ADC-305
®
®
TECHNICAL NOTES
1. The ADC-305 has separate +AVS and +DVS pins. It is
recommended that both +AVS and +DVS be powered from a
single supply since a time lag between start up of separate
supplies could induce latch up. Other external logic circuits
must be powered from a separate digital supply. +DVS (pins
11 and 13) and +AVs (pins 14, 15 and 18) should be tied
together externally. DGND (pins 2 and 24) and AGND (pins
20 and 21) should also be tied together externally. Power
supply grounds must be connected at one point to the
ground plane directly beneath the device. Digital returns
should not flow through analog grounds.
2. Bypass all power lines to ground with a 0.1µF ceramic chip
capacitor in parallel with a 47µF electrolytic capacitor.
Locate the bypass capacitor as close to the unit as
possible.
3. Even though the analog input capacitance is a low 15pF, it
is recommended that high frequency input be provided via
a high speed buffer amplifier. A parasitic oscillation may be
generated when a high speed amplifier is used. A 75 ohm
resister inserted between the output of an amplifier and the
analog input of the ADC-305 will improve the situation. A
resistor larger than 100 ohms may degrade linearity.
4. The input voltage range is determined by voltages applied
to VRB (Reference Bottom) and VRT (Reference Top). Keep
to the following equations;
0V
≤VRB≤VRT≤2.8V
1.8V
≤VRT–VRB≤2.8V
The analog input range is normally 2Vp-p.
Self Bias Mode
a. Tie VRB to VRBS, and tie VRT to VRTS respectively. The analog
input range in this case is +0.64V to +2.73V nominal.
b. Tie VRB to AGND, and tie VRT to VRTS respectively. The
analog input voltage range is 0 to +2.39V in this case.
FUNCTIONAL SPECIFICATIONS
(Specification are typical at TA = +25°C, +VRT = +2.5V, VRB = +0.5V, +AVS = +DVS =
+5v, fS = 20MHz sampling unless otherwise specified.)
ANALOG INPUTS
MIN.
TYP.
MAX.
UNITS
Input Voltage Range (VIN) Œ
+0.5 to +2.5
Volts
Input Capacitance
11
pF
(VIN = 1.5Vdc+0.07VRMS)
Input Impedance
12.5
k
Input Signal Bandwidth
18
MHz
(VIN-2Vp-p, –1dB)
REFERENCE INPUTS
Ref. Resitance
VRT to VRB
230
300
450
Ref. Current
4.5
6.6
8.7
mA
Ref. Voltage Œ
VRT
+1.8
+2.8
Volts
VRB
0
VRT
Volts
Offset Voltage
VRT
–10
–35
–60
mV
VRB
0
+15
+45
mV
Self Bias I Œ VRBS
+0.6
+0.64
+0.68
Volts
VRTS-VRBS
+1.96
+2.09
+2.21
Volts
Self Bias II Œ ŽVRTS
+2.25
+2.39
+2.53
Volts
DIGITAL INPUTS
Input Voltage (CMOS)
Logic Levels (VIH) "1"
+4
Volts
Logic Level (VIL) "0"
+1
Volts
Input Current (@VIH=+DVS)"1"
5
µA
(@VIL=0) "0"
5
µA
Clock Pulse Width TPW1
25
ns
(A/D CLK)
TPW0
25
ns
DIGITAL OUTPUTS
Output Data
8-bit Binary Parallel
Output Voltage
3-State TTL compatible
Output Current 
Logic Level "1"
–1.1
mA
Logic Level "0"
+3.7
mA
Output Current 
Logic Level "1"
16
µA
Logic Level "0"
16
µA
Output Data Delay, Td
18
30
ns
PERFORMANCE
Resolution
8
Bit
Maximum Sampling Rate
20
MHz
Minimum Sampling Rate
0.5
MHz
Aperature Delay, TA
4
ns
Aperature Jitter
30
ps
Differential Linearity Error
±0.3
±0.5
LSB
Integral Linearity Error
+0.5
+1.3
LSB
Differential Gain Error ‘
1
%
Differential Phase Error ‘
0.5
deg
POWER REQUIREMENTS
MIN.
TYP.
MAX.
UNITS
Power Supply (+AVS, +DVS)
+4.75
+5.0
+5.25
Volts
I A GND - D GND I
100
mV
Power Supply Current
12
17
mA
Power Dissipation
60
85
mW
PHYSICAL/ENVIRONMENTAL
Operating Temp. Range
–40 to +85°C
Storage Temp. Range
–55 to +150°C
Package Type
ADC-305-1
24-pin Plastic DIP
ADC-305-3
24-pin Plastic SOP
Weight
ADC-305-1
2.0 grams
ADC-305-3
0.3 grams
Footnotes:
ΠSee Technical Note 4
 Short VRB (pin 23) to VRBS (pin 22).
Short VRT (pin 17) to VRTS (pin 16).
Ž Short VRB (pin 23) to A GND.
Short VRT (pin 17) to VRTS (pin 16).
2
 OE=OV, VOH=+DVS–0.5V,
VOL=+0.4V
 OE=+DVS, VOH=+DVS, VOL=0V
‘ NTSC 40IRE mode ramp, 14.3MHz
sampling
Table 1. Digital Output Coding
PARAMETERS
MIN
MAX
UNITS
Power Supply Voltage (+AVS, +DVS)
–0.5
+7
Volts
Analog Input Voltage (VIN)
–0.5
+AVS +0.5
Volts
Reference Input Voltage (VRT, VRB)
–0.5
+AVS +0.5
Volts
Digital Input Voltage (VIH, VIL)
–0.5
+DVS +0.5
Volts
Digital Output Voltage (VOH, VOL)
–0.5
+DVS +0.5
Volts
ABSOLUTE MAXIMUM RATINGS (TA = 25°C)
STEP
DATA BITS OUT
VIN
CODE
DEC
HEX
MSB
LSB
OV
Zero
0
00
0 0 0 0
0 0 0 0
+0.9922V
+1/2FS –1LSB
127
7F
0 1 1 1
1 1 1 1
+1.000V
+1/2FS
128
80
1 0 0 0
0 0 0 0
+1.9922V
+FS
255
FF
1 1 1 1
1 1 1 1


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