ADS-926ME-2 データシートの表示（PDF） - DATEL Data Acquisition products
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ADS-926ME-2 Datasheet PDF : 9 Pages
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ADS-926
14-Bit, 500kHz, Low-Power Sampling A/D Converters
+25°C
0 TO +70°C
–55 TO +125°C
ANALOG OUTPUT
Internal Reference
Voltage
Drift
External Current
DIGITAL OUTPUTS
Logic Levels
Logic "1"
Logic "0"
Logic Loading "1"
Logic Loading "0"
Delay, Falling Edge of EOC to Output Data Valid
Output Coding
POWER REQUIREMENTS , ±15V
Power Supply Ranges
+15V Supply
–15V Supply
+5V Supply
Power Supply Currents
+15V Supply
–15V Supply
+5V Supply
Power Dissipation
Power Supply Rejection
POWER REQUIREMENTS, ±12V
Power Supply Ranges
+12V Supply
–12V Supply
+5V Supply
Power Supply Currents
+12V Supply
–12V Supply
+5V Supply
Power Dissipation ±12V
Power Dissipation ±15V
Power Supply Rejection
MIN.
+9.95
—
—
TYP.
MAX.
MIN.
+10.0
±5
—
+10.05
—
1.5
+9.95
—
—
TYP.
MAX.
MIN.
+10.0
±5
—
+10.05
—
1.5
+9.95
—
—
TYP.
MAX. UNITS
+10.0
±5
—
+10.05
—
1.5
Volts
ppm/°C
mA
+2.4
—
—
+2.4
—
—
+2.4
—
—
Volts
—
—
+0.4
—
—
+0.4
—
—
+0.4
Volts
—
—
–4
—
—
–4
—
—
–4
mA
—
—
+4
—
—
+4
—
—
+4
mA
—
—
35
—
—
35
—
—
35
ns
Offset Binary
+14.5
–14.5
+4.75
—
—
—
—
—
+15.0
–15.0
+5.0
+41
–23
+71
1.4
—
+15.5
–15.5
+5.25
+63
–40
+85
1.75
±0.02
+14.5
–14.5
+4.75
—
—
—
—
—
+15.0
–15.0
+5.0
+41
–23
+71
1.4
—
+15.5
–15.5
+5.25
+63
–40
+85
1.75
±0.02
+14.5
–14.5
+4.75
—
—
—
—
—
+15.0
–15.0
+5.0
+41
–23
+71
1.4
—
+15.5
Volts
–15.5
Volts
+5.25
Volts
+63
–40
+85
1.75
±0.02
mA
mA
mA
Watts
%FSR/%V
+14.5
–14.5
+4.75
—
—
—
—
—
—
+15.0
–15.0
+5.0
+41
–23
+71
1.15
1.3
—
+15.5
–15.5
+5.25
+60
–40
+85
1.6
1.8
±0.02
+14.5
–14.5
+4.75
—
—
—
—
—
—
+15.0
–15.0
+5.0
+41
–23
+71
1.15
1.3
—
+15.5
–15.5
+5.25
+60
–40
+85
1.6
1.8
±0.02
+14.5
–14.5
+4.75
—
—
—
—
—
—
+15.0
–15.0
+5.0
+41
–23
+71
1.15
1.3
—
+15.5
Volts
–15.5
Volts
+5.25
Volts
+60
–40
+85
1.6
1.8
±0.02
mA
mA
mA
Watts
Watts
%FSR/%V
Footnotes:
➀ All power supplies must be on before applying a start convert pulse. All supplies
and the clock (START CONVERT) must be present during warmup periods. The
device must be continuously converting during this time.
➁ See Ordering Information for 0 to +10V input range. Contact DATEL for availability
of other input voltage ranges.
➂ A 500kHz clock with a 200ns wide start convert pulse is used for all production
testing. For applications requiring less than a 500kHz sampling rate, wider start
convert pulses can be used. See Timing Diagram for more details.
➃ Effective bits is equal to:
(SNR + Distortion) – 1.76 +
20 log
Full Scale Amplitude
Actual Input Amplitude
6.02
➄ This is the time required before the A/D output data is valid after the analog input
is back within the specified range.
TECHNICAL NOTES
1. Obtaining fully specified performance from the ADS-926 requires care-
ful 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 (14, 19 and 23) directly to a
large analog ground plane beneath the package.
Bypass all power supplies and the REFERENCE OUTPUT (pin 21) to ground
with 4.7μF tantalum capacitors in parallel with 0.1μF ceramic capacitors.
Locate the bypass capacitors as close to the unit as possible. If the user-
installed offset and gain adjusting circuit shown in Figure 2 is used, also
locate it as close to the ADS-926 as possible.
2. The ADS-926 achieves its specified accuracies without the need for exter-
nal calibration. If required, the device's small initial offset and gain errors
can be reduced to zero using the input circuit of Figure 2. When using this
circuit, or any similar offset and gain-calibration hardware, make adjust-
ments following warmup. To avoid interaction, always adjust offset before
gain.
3. When operating the ADS-926 from ±12V supplies, do not drive external
circuitry with the REFERENCE OUTPUT. The reference's accuracy and drift
specifications may not be met, and loading the circuit may cause accuracy
errors within the converter.
4. Applying a start convert pulse while a conversion is in progress (EOC =
logic "1") initiates a new and inaccurate conversion cycle. Data from the
interrupted and subsequent conversions will be invalid.
DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: help@datel.com
02 Oct 2015 MDA_ADS-926.C03.D1 Page 3 of 9
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