ADS-118 查看數據表（PDF） - DATEL Data Acquisition products
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ADS-118 Datasheet PDF : 9 Pages
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ADS-118, ADS-118A
12-Bit, 5MHz, 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"
Delay, Falling Edge of EOC to
Output Data Valid
Delay, Falling Edge of ENABLE to
Output Data Valid
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.
—
85
90
—
200
—
5
—
—
0 to +70°C
MIN.
TYP.
MAX.
—
85
90
—
200
—
5
—
—
–55 to +125°C
MIN.
TYP.
MAX.
—
85
90
—
200
—
5
—
—
UNITS
ns
ns
MHz
+2.4
—
—
+2.4
—
—
+2.4
—
—
Volts
—
—
+0.4
—
—
+0.4
—
—
+0.4
Volts
—
—
–4
—
—
–4
—
—
–4
mA
—
—
+4
—
—
+4
—
—
+4
mA
—
—
20
—
—
20
—
—
20
MHz
—
—
10
—
—
10
—
—
10
MHz
Offset Binary
+4.75
+5.0
+5.25 +4.75
+5.0
+5.25
+4.9
–4.75
–5.0
–5.25
–4.75
–5.0
–5.25
–4.9
—
+205
+220
—
+205
+220
—
—
–180
–205
—
–180
–205
—
—
1.8
2.1
—
1.8
2.1
—
—
—
±0.1
—
—
±0.1
—
+5.0
–5.0
+205
–180
1.8
—
+5.25
–5.25
+220
–205
2.1
±0.1
Volts
Volts
mA
mA
Watts
%FSR/%V
Footnotes:
➀ 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.
➁ Input voltage ranges for ADS-118A is ±1.25V
➂ A 100ns wide start convert pulse is used for all production testing. For applications
requiring less than an 5MHz sampling rate, wider start convert pulses can be used.
NOTE: The device only requires the rising edge of a start convert pulse to operate.
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 once the analog input is
back within the specified range.
➅ The minimum supply voltages of +4.9V and –4.9V for ±VDD are required for
–55°C operation only. The minimum limits are +4.75V and –4.75V when operating
at +125°C
TECHNICAL NOTES
1. Obtaining fully specified performance from the ADS-118 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-118 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 2a and 2b. For operation without adjustment, tie pin 17 to analog
ground. When using this circuitry, or any similar offset and gain-calibration
hardware, make adjustments following warmup. To avoid interaction,
always adjust offset before gain.
3. To enable the three-state outputs, connect ENABLE (pin 17) to a logic
"0" (low). To disable, connect pin 17 to logic "1" (high). The three-state
outputs are permanently enabled in the ADS-118A.
4. Applying a start convert pulse while a conversion is in progress (EOC =
logic "1") will initiate a new and inaccurate conversion cycle.
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 ADS-118.B05 Page 3 of 9
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