DATEL's ADS-117 is a functionally complete, 12-bit, 2MHz,
sampling A/D converter. Its standard, 24-pin, double-width
DIP contains a fast-settling sample-hold amplifier, a 12-bit
subranging (two-step) A/D converter, a precision reference,
three-state output register and all the timing and control logic
necessary to operate from a single start convert pulse. Digital
input and output levels are TTL.
Total harmonic distortion (THD) and signal-to-noise ratio
(including distortion) typically run –78dB and 70dB,
respectively, with full scale inputs up to 100kHz. The ADS117 requires ±15V and +5V power supplies and typically
consumes 1.6 Watts. Models are available for use in either
commercial (0 to +70°C) or military (–55 to +125°C) operating
temperature ranges.
+15V Supply (Pin 22)0 to +16Volts
–15V Supply (Pin 24)0 to –16Volts
+5V Supply (Pin 13)0 to +6.0Volts
Digital Inputs (Pin 16, 17, 18)–0.3 to +VDD +0.3Volts
Analog Input (Pin 19)–9 to +15Volts
Lead Temp. (10 seconds)+300°C
FUNCTIONAL SPECIFICATIONS
(TA = +25°C, ±VCC = +15V, +VDD =+5V, 2MHz sampling rate, and a minimum 3 minute
warmup unless otherwise specified.)
0°C to +70°C—±1/2±0.95LSB
–55°C to +125°C—±1+1.5LSB
Full Scale Absolute Accuracy
(see Tech Note 1)
0°C to +70°C—±0.13±0.44%FSR
–55°C to +125°C—±0.25±0.73%FSR
Unipolar/Bipolar Zero Error
0°C to +70°C (see Tech Note 1)—±0.07±0.38%FSR
–55°C to +125°C—±0.22±0.73%FSR
Bipolar Offset Error
0°C to +70°C (see Tech Note 1)—±0.1±0.38%FSR
–55°C to +125°C—±0.53±0.73%FSR
Gain Error (see Tech Note 1)
0°C to +70°C—±0.1±0.38%
–55°C to +125°C—±0.53±0.73%
Internal Reference Voltage
0°C to +70°C+9.97+10.0+10.03Volts
–55°C to +125°C+9.95—+10.05Volts
External Current——1.5mA
DYNAMIC PERFORMANCE
Spurious Free Dynamic
Range (–0.5dB)
dc to 100kHz—–81—dB
100kHz to 500kHz—–75–70dB
500kHz to 1MHz—–70—dB
Total Harm. Distort. (–0.5dB)
dc to 100kHz—–78—dB
100kHz to 500kHz—–73–68dB
500kHz to 1MHz—–71—dB
Input Bandwith (–3dB)
Small Signal (–20dB input)810—MHz
Large Signal (–0.5dB input)79—MHz
Feedthrough (1MHz)–72–74—dB
➀
See Table 1 also
➁
Same specifications for in-band harmonics.
➀
Ω
➁
DYNAMIC PERF. (cont)MIN.TYP.MAX.UNITS
SNR (wo/distortion, –0.5dB)
dc to 100kHz
0°C to +70°C—72—dB
–55°C to +125°C—72—dB
100kHz to 500kHz
0°C to +70°C6570—dB
–55°C to +125°C6570—dB
500kHz to 1MHz
0°C to +70°C—70—dB
–55°C to +125°C—70—dB
SNR (and distort., –0.5dB)
dc to 100kHz
0°C to +70°C—70—dB
–55°C to +125°C—69—dB
100kHz to 500kHz
0°C to +70°C6470—dB
–55°C to +125°C6269—dB
500kHz to 1MHz
0°C to +70°C—69—dB
–55°C to +125°C—69—dB
1. Applications which are unaffected by endpoint errors or
remove them through software will use the typical connections shown in Figure 3. Remove system errors or adjust
the small initial errors of the ADS-117 to zero using the
optional external circuitry shown in Figure 4. The external
adjustment circuit has no effect on the throughput rate.
2. Always connect the analog and digital grounds to a ground
plane beneath the converter for best performance. The
analog and digital grounds are not connected to each other
internally.
3. Bypass the analog and digital supplies and the +10V
reference (pin 21) to ground with 4.7µF, 25V tantalum
electrolytic capacitors in parallel with 0.1µF ceramic
capacitors. Bypass the +10V reference (pin 21) to
ANALOG GROUND (pin 23).
4. Obtain straight binary/offset binary output coding by tying
COMP BIN (pin 18) to +5V or leaving it open. The device
has an internal pull-up resistor on this pin. To obtain
complementary binary or complementary offset binary
ADS-117
output coding, tie pin 18 to ground. The pin 18 signal is
compatible with CMOS/TTL logic levels for those users
desiring dynamic control of this function. Do not change
COMP BIN status while EOC is high.
5. To enable the three-state outputs, connect ENABLE (pin
17) to a logic "0" (low). To disable, connect pin 17 to a logic
"1" (high).
6. To meet the guaranteed conversion rate, a maximum start
convert pulse is specified. A wider start convert pulse will
result in slower conversion rates. An initial start convert
pulse is required before performing an actual conversion
after power-up to assure the sample-hold is in the acquisition mode.
Figure 2 shows the relationship between the various input
signals. The timing shown applies over the operating
temperature range and over the operating power supply
range.
7. Re-initiating the START CONVERT (pin 16) while EOC is a
logic "1" (high) will result in a new conversion sequence.
START
CONVERT
INTERNAL S/H
EOC
OUTPUT
DATA
NN+1
50ns typ.,
30ns min., 60ns max.
10ns min.
25ns max.
Hold
10ns min.
17ns max.
Conversion Time
325ns typ.
DATA N-1 VALID
350ns min.
Note: Scale is approximately 25ns per division.
Figure 2. ADS-117 Timing Diagram
Acquisition Time
165ns typ.
170ns max.
INVALID
DATA
150ns max.
60ns max.
35ns max.
DATA N VALID
INVALID
DATA
3
Page 4
ADS-117
T
®®
CALIBRATION PROCEDURE
1. Connect the converter per Figure 3, Figure 4, and Table 1
for the appropriate input range. Apply a pulse of 150
nanoseconds to the START CONVERT input (pin 16) at a
rate of 250kHz. This rate is chosen to reduce flicker if
LED’s are used on the outputs for calibration purposes.
2. Zero Adjustments
Apply a precision voltage reference source between the
amplifier’s analog input and ground. Adjust the output of the
reference source per Table 2. For unipolar, adjust the zero
trimming potentiometer so that the output code flickers
equally between 0000 0000 0000 and 0000 0000 0001 with
the pin 18 tied high (straight binary) or between 1111 1111
1111 and 1111 1111 1110 with the pin 18 tied low (complementary binary).
For bipolar operation, adjust the potentiometer such that
the code flickers equally between 1000 0000 0000 and
1000 0000 0001 with pin 18 tied high (offset binary) or
between 0111 1111 1111 and 0111 1111 1110 with pin 18
tied low (complementary offset binary).
3. Full-Scale Adjustment
Set the output of the voltage reference used in step 2 to the
value shown in Table 1. Adjust the gain trimming potentiometer so that the output code flickers equally between 1111
1111 1110 and 1111 1111 1111 for pin 18 tied high or
between 0000 0000 0001 and 0000 0000 0000 for pin 18
tied low.
4. To confirm proper operation of the device, vary the precision reference voltage source to obtain the output coding
listed in Table 3.
Dimension Tolerances
2 place decimal (.XX) ±0.010 (±0.254)
24
112
0.100 TYP.
(2.540)
1.100
(27.940)
PIN 1 INDEX
13
0.80 MAX.
(20.32)
0.200 MAX.
(5.080)
3 place decimal (.XXX) ±0.005 (±0.127)
Lead Material:
Lead Finish:
over 100 microinches (nominal) nickel plating
®®
(unless otherwise indicated):
Kovar alloy
50 microinches (minimum) gold plating
+0.002
0.010
–0.001
0.190 MAX.
(4.826)
0.018 ±0.002
(0.457)
0.100
(2.540)
(1.016)
0.040
SEATING
PLANE
0.025
(0.635)
(0.254)
0.600 ±0.010
(15.240)
0.100
(2.540)
ORDERING INFORMATION
MODEL NUMBEROPERATING TEMP. RANGE
ADS-117MC0 to +70°C
ADS-117MM–55 to +125°C
ADS-117/883–55 to +125°C
For MIL-STD-883 product specification or availability of surface-mount packaging, contact DATEL. Receptacles for PC mounting
can be ordered through AMP Inc., Part # 3-331272-8 (Component Lead Socket), 24 required.
ACCESSORIES
ADS-EVAL1Evaluation Board (without ADS-117)
HS-24Heat Sink for all ADS-117 models
®®
DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151
Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356
Internet: www.datel.com E-mail:sales@datel.com
SO 9001
ISO 9001
DATEL (UK) LTD. Tadley, England Tel: (01256)-880444
DATEL S.A.R.L. Montigny Le Bretonneux, France Tel: 1-34-60-01-01
DATEL GmbH München, Germany Tel: 89-544334-0
DS-0230F07/04
DATEL KK Tokyo, Japan Tel: 3-3779-1031, Osaka Tel: 6-6354-2025
DATEL China, Shanghai, China Tel:011-86-51317199
DATEL makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein
do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without notice. The DATEL logo is a registered DATEL, Inc. trademark.
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