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ADS-119MM Datasheet PDF : 10 Pages
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ADS-119
12-Bit, 10MHz, Low-Power Sampling A/D Converters
DYNAMIC PERFORMANCE (Cont.)
S/H Acquisition Time
( to ±0.001%FSR, 10V step)
Overvoltage Recovery Time ➄
A/D Conversion Rate
DIGITAL OUTPUTS
Logic Levels
Logic "1"
Logic "0"
Logic Loading "1"
Logic Loading "0"
Output Coding
POWER REQUIREMENTS
Power Supply Ranges ➅
+5V Supply
–5V Supply
Power Supply Currents
+5V Supply
–5V Supply
Power Dissipation
Power Supply Rejection
+25°C
MIN.
TYP.
MAX.
30
35
37
—
100
—
10
—
—
+2.4
—
—
—
—
+0.4
—
—
–4
—
—
+4
+4.75
–4.75
—
—
—
—
+5.0
–5.0
+200
–180
1.8
—
+5.25
–5.25
+225
–205
2.1
±0.1
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. There is slight
degradation in performance when using ±12V supplies.
➁ See ordering information for availability of ±5V input range. Contact DATEL for
availability of other input voltage ranges.
➂ A 200ns wide start convert pulse is used for all production testing. Only the rising
edge of the start convert pulse is required for the device to operate
(edge-triggered).
0 to +70°C
MIN.
TYP.
MAX.
30
35
37
—
100
—
500
—
—
–55 to +125°C
MIN.
TYP.
MAX.
30
35
37
—
100
—
500
—
—
UNITS
ns
ns
MHz
+2.4
—
—
+2.4
—
—
Volts
—
—
+0.4
—
—
+0.4
Volts
—
—
–4
—
—
–4
mA
—
—
+4
—
—
+4
mA
Offset Binary
+4.75
+5.0
+5.25
+4.9
–4.75
–5.0
–5.25
–4.9
—
+200
+225
—
—
–180
–205
—
—
1.8
2.1
—
—
—
±0.1
—
+5.0
–5.0
+205
–180
1.8
—
+5.25
–5.25
+225
–205
2.1
±0.1
Volts
Volts
mA
mA
Watts
%FSR/%V
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-119 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 (14, 18, and 23) directly
to a large analog ground plane beneath the package. Bypass all power
supplies 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.
2. The ADS-119 achieves its specified accuracies without the need for
external calibration. If required, the device's small initial offset and gain
errors can be reduced to zero using the adjustment circuitry shown in
Figures 3 and 4. For operation without adjustment, tie pin 17 to analog
ground. When using this circuitry, or any similar offset and gaincalibra-
tion hardware, make adjustments following warmup. To avoid interaction,
always adjust offset before gain.
3. Applying a start convert pulse while a conversion is in progress (EOC =
logic "1") will initiate a new and inaccurate conversion cycle.
4. Data is valid only for the time period (55ns, typical) shown in Figure 2
even if the device is sampling at less than 10MHz.
DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: help@datel.com
26 Jun 2015 MDA_ADS-119.C02 Page 3 of 10
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