ADS-30639 Datel, Inc., ADS-30639 Datasheet - Page 3

• Manufacturer Part Number: ADS-30639
• Description: Dual, 14-bit, 6.4mhz Sampling A/D Converter
• Manufacturer: Datel, Inc.

TECHNICAL NOTES
1. Obtaining fully specified performance from the ADS-30639
Footnotes:
DYNAMIC PERFORMANCE (Cont.)
S/H Acquisition Time
Overvoltage Recovery Time
A/D Conversion Rate
DIGITAL OUTPUTS
Logic Levels
Output Coding
Output Capacitance C
Tri-State Output Leakage Current I
POWER REQUIREMENTS
Power Supply Ranges
Power Supply Currents
Power Dissipation
Power Supply Rejection
À
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requires careful attention to pc card layout and power
supply decoupling. The device’s analog and digital ground
systems are connected to each other internally. For optimal
performance, tie all ground pins (4 and 24) directly to a
large analog ground plane beneath the package.
Bypass all power supplies to ground with 4.7 F tantalum
capacitors in parallel with 0.1 F ceramic capacitors. Locate
the bypass capacitors as close to the unit as possible.
®
Logic "1"
Logic "0"
Logic Loading "1"
Logic Loading "0"
+5V Supply
–5V Supply
+15V Supply
+5V Supply
–5V Supply
+15V Supply
All power supplies should be on before applying a start convert pulse. All
supplies and the clock (start convert pulses) must be present during warmup
periods. The device must be continuously converting during this time.
During the 3-minute warm up period there is a slight offset and gain drift but
the dynamic specifications of the ADS-30639 are not affected.
Contact DATEL for other input voltage ranges.
A 50% duty cycle start convert pulse is used for all production testing. For
applications requiring less than an 6.4MHz sampling rate, wider start convert pulses
can be used. A 50% duty cycle is recommended for all sampling fequencies.
( to ±0.003%FSR, 5V step)
Å
OUT
OZ
®
+13.5
GND
+2.4
+4.9
–4.5
MIN.
6.4
—
—
—
—
—
—
—
—
—
—
—
+25°C
TYP.
+5.0
–5.0
175
+15
220
1.7
45
25
20
—
—
—
—
—
—
—
—
±0.05
MAX.
+5.25
+16.5
–5.5
+0.4
Vcc
270
1.9
–4
+4
35
35
—
—
—
±20
15
3
+13.5
GND
–4.5
MIN.
+2.4
+4.9
6.4
—
—
—
—
—
—
—
—
—
—
—
2. The ADS-30639 achieves its specified accuracies without
3. A passive bandpass filter is used at the input of the A/D for
Ä
Å
Effective bits is equal to:
+5 VA and 5 VD supplies are connected internally.
the need for external calibration. It is recommended that
the +5VA and +5VD supplies should be powered up from
the same source.
all production testing.
0 to +70°C
Two’s Complement
TYP.
+5.0
–5.0
175
+15
220
1.7
45
—
—
—
—
—
25
20
—
—
—
(SNR + Distortion) – 1.76 +
MAX.
+5.25
+16.5
±0.05
+0.4
–5.5
Vcc
270
1.9
–4
—
—
—
+4
±20
35
35
15
+13.5
GND
–4.5
MIN.
+2.4
+4.9
6.4
—
—
—
—
—
—
—
—
—
—
—
–55 to +125°C
6.02
20 log
TYP.
–5.0
+5.0
175
+15
220
—
—
1.7
45
25
20
—
—
—
—
—
—
Actual Input Amplitude
Full Scale Amplitude
ADS-30639
MAX.
+5.25
+16.5
±0.05
+0.4
–5.5
Vcc
270
1.9
–4
—
—
—
+4
35
35
±20
15
%FSR/%V
UNITS
Watts
Volts
Volts
Volts
Volts
Volts
MHz
mA
mA
mA
mA
mA
µA
ns
ns
pf