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ADC-304-3 Datasheet PDF : 5 Pages
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ADC-304
®
®
ABSOLUTE MAXIMUM RATINGS
PARAMETERS
LIMITS
UNITS
Supply Voltages
+VS to GND
0 to +6
Volts
–VS to GND
0 to –6
Volts
Input Voltage (Analog) Vin
–VS to (ANA GND + 0.3) Volts
(dual power supply)
Input Voltage (Reference) VT, VB, VM
–VS to (ANA GND + 0.3) Volts
(dual power supply)
VT – VB
2.5
Volts
Input Current
IM
–3.0 to +3.0
mA
Input Voltage (Digital) Digital Inputs
–0.5 to +VS
Volts
FUNCTIONAL SPECIFICATIONS
Unless otherwise noted, the following specifications apply to the ADC-304 when used
either with a single or dual power source. The test conditions are:
For single power supply operation:
+VS = +5V, DIG GND = 0V
–VS = 0V, VT = +5V
VB = +3V, TA = +25°C
ANA GND = +5V, fs = 20MHz
For dual power supply operation:
+VS = +5V, DIG GND = 0V
–VS = –5.2V, VT = 0V,
VB = –2V, TA = +25°C
ANA GND = 0V, fs = 20MHz
ANALOG INPUTS
MIN. TYP. MAX. UNITS
Input Range
Input Capacitance
Input Bias Current
Offset Voltage
VT
VB
VB
VT
Volts
—
30
35
pF
15
50
100
µA
–8
–13
–19
mV
0
+5
+11
mV
DIGITAL INPUTS
Logic Levels
Logic “1”
Logic “0”
Logic Input Currents
Logic “1”
Logic “0”
+2.0
—
—
Volts
—
—
+0.8
Volts
—
–100
–150
µA
–0.1
–0.32
–0.5
mA
PERFORMANCE
Conversion Rate
20
—
—
MHz
Integral Nonlinearity
—
—
±1/2
LSB
Differential Nonlinearity
—
—
±1/2
LSB
Differential Gain Error
—
—
1.5
%
Differential Phase Error
—
—
0.5 degrees
Aperture Delay Ta
5
7
9
ns
Aperture Uncertainty
—
30
—
ps
Signal-to-Noise and Distortion
(Vin = full scale, fs = 20MHz)
fin = 1MHz
47
dB
fin = 5MHz
43
dB
fin = 10MHz
35
dB
Clock Pulse Width
Tpw1
35
—
—
ns
Tpw0
10
—
—
ns
Reference Pin Current
11
15
18
mA
Reference Resistance (VT to VB)
—
130
—
Ohms
Reference Input (dual supply)
VT
–0.1
0
+0.1
Volts
VB
–1.8
–2.0
–2.2
Volts
Footnotes:
fin = 1kHz, ramp
NTSC 40 IRE-modulated ramp, fs = 14.3MHz
DIGITAL OUTPUTS
Resolution and Output Coding
Logic Levels
Logic “1”
Logic “0”
Logic Loading “1”
Logic Loading “0”
Output Data Delay
TDLH
TDHL
MIN. TYP. MAX. UNITS
8
bits
Straight binary
Complementary binary
Two’s complement
Complementary two’s complement
+2.7
+3.4
—
Volts
—
—
+0.5
Volts
—
–500
—
µA
—
—
+3
mA
15
20
30
ns
22
26
35
ns
POWER REQUIREMENTS
Single Power Supply
Supply Voltage = +VS
Supply Voltage = –VS
Supply Current = +IS
Power Dissipation
Dual Power Supply
Supply Voltage = +VS
Supply Voltage = –VS
Supply Current = +IS
Supply Current = –IS
Power Dissipation
+4.75
+5.0
+5.25
Volts
—
0
—
Volts
+56
+71
+91
mA
280
355
455
mW
+4.75
+5.0
+5.25
Volts
–4.75
–5.2
–5.5
Volts
+7
+10
+14
mA
–50
–62
–78
mA
295
375
476
mW
PHYSICAL/ENVIRONMENTAL
Operating Temperature
Storage Temperature
–20
—
+75
°C
–55
—
+150
°C
TECHNICAL NOTES
1. The two DIGITAL GND pins (pins 5 and 11 on the DIP, pins
12 and 18 on the SOP) are not connected to each other
internally and neither are the two +5V POWER pins (6 and
10 on the DIP, 13 and 17 on the SOP). All four pins must be
externally connected to the appropriate pcb patterns. Also,
the DIGITAL GND and ANALOG GND pins are not
connected to each other internally.
2. Layout of the analog and digital sections should be
separated to reduce interference from noise. To further
guard against unwanted noise, it is recommended to
bypass, as close as possible, the voltage supply pins to
their respective ground pins with 1µF tantalum and 0.01µF
ceramic disk capacitors in parallel.
3. The input capacitance of the analog input is much smaller
than that of a typical flash A/D converter. It is necessary to
use an amplifier with sufficient bandwidth and driving power.
The analog input pins are separated internally, so they
should be connected together externally. If the ADC-304 is
driven with a low output impedance amplifier, parasitic
oscillations may occur.
These parasitic oscillations can be prevented by introducing
a small resistance of 2 to 10Ω between the amplifier output
and the ADC-304’s A/D input. This resistance must have a
very low value of series inductance at high frequencies.
Note that each of the analog input pins is divided in this
manner with these resistances. Connect the driving amplifier
as close as possible to the A/D input of the ADC-304.
2
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