HDAS-16, HDAS-8
12-Bit, 50kHz, Complete
Data Acquisition Systems
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FEATURES
•Miniature 62-pin cermanic package
•12-Bit resolution, 50kHz throughput
•Full-scale input range from 50mV to 10V
•Three-state outputs
•16 S.E. or 8 differential input channels
•Auto-sequencing channel addressing
•MIL-STD-883 versions
•No missing codes
GENERAL DESCRIPTION
Using thin and thick-film hybrid technology, DATEL offers
complete low-cost data acquisition systems with superior
performance and reliability.
The HDAS-8 (with 8 differential input channels) and the HDAS-
16 (with 16 single-ended input channels) are complete, high-
performance, 12-bit data acquisition systems in 62-pin
packages. Each HDAS may be expanded up to 32 single-
ended or 16 differential channels by adding external
multiplexers.
Internal channel address sequencing is automatic after each
conversion, or the user may supply external channel
addresses.
Internal HDAS circuitry includes:
•Analog input multiplexer (16 S.E. or 8 diff.)
•Resistor-programmable instrumentation amplifier
•Sample-and-hold circuit complete with MOS
hold capacitor
•10 Volt buffered reference
•12-bit A/D converter with three-state outputs and control
logic
CH0 HI /CH0
CH1 HI /CH1
CH2 HI /CH2
CH3 HI /CH3
CH4 HI /CH4
CH5 HI /CH5
CH6 HI /CH6
CH7 HI /CH7
CH0 LO /CH8
CH1 LO /CH9
CH2 LO /CH10
CH3 LO /CH11
CH4 LO /CH12
CH5 LO /CH13
CH6 LO /CH14
CH7 LO /CH15
4
3
2
1
62
61
60
59
58
57
56
55
54
53
52
51
11 1012 15 1716
39 38 3740
9
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
7
BIT 1 (MSB)
BIT 2
BIT 3
BIT 4
EN (1-4)
BIT 5
BIT 6
BIT 7
BIT 8
EN (5-8)
BIT 9
BIT 10
BIT 11
BIT 12 (LSB)
EN (9-12)
EOC
A1
MUX
ADDRESS OUT
RDELAY
ANA SIG COM
45
CLEAR
36
20
–15V SUPPLY
MUX ENABLE
(HOLD)
I/A
16 CHANNEL
SINGLE ENDED
OR
8 CHANNEL
DIFFERENTIAL
12-BIT
A/D
CONVERTER
S/H
THREE
STATE
THREE
STATE
THREE
STATE
ANALOG
MULTIPLEXER
CONTROL
LOGIC MUX
ADDRESS
REGISTER
(START)
6 8 19 1413 41 44 42 43 18
A2
A4
A8
STROBE
LOAD
RA1
RA2
RA4
RA8
MUX
ADDRESS IN
ANA PWR COM
+5V SUPPLY
DIG COM
474850495 46
AMP IN HI
AMP IN LO
RGAIN HI
RGAIN LO
ANA SIG COM
ANA SIG COM
S/H OUT
+10V REF OUT
BIPOLAR INPUT
GAIN ADJUST
OFFSET ADJUST
THREE STATE OUTPUT DATA
(BUFFERED)
+15V SUPPLY
Figure 1. HDAS-16 and HDAS-8 Functional Block Diagram
DATEL, Inc., Mansfield, MA 02048 (USA) · Tel: (508) 339-3000, (800) 233-2765 Fax: (508) 339-6356 • Email: sales@datel.com • Internet: www.datel.com
DATEL, Inc.
, 11 Cabot Boulevard, Mansfield, MA 02048-1194 (U.S.A.) Tel: 508-339-3000 Fax: 508-339-6356 • For immediate assistance 800-233-2765
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HDAS-16, HDAS-8
PERFORMANCE (cont.) MIN. TYP.MAX. UNITS
Unipolar Zero Error
+25°C ➂ — — ±0.1 %FSR
–55 to +125°C — — ±0.3 %FSR
Bipolar Zero Error
+25°C ➂— — ±0.1 %FSR
–55 to +125°C — — ±0.3 %FSR
Bipolar Offset Error
+25°C ➂— — ±0.1 %FSR
–55 to +125°C — — ±0.3 %FSR
Gain Error
+25°C ➂ — — ±0.2 %
–55 to +125°C — — ±0.3 %
DYNAMIC CHARACTERISTICS
Acquisition Time, Gain = 1
+25°C —9 10 µs
–55 to +125°C ——15 µs
Aperture Delay Time — — 500 ns
Aperture Uncertainty — — 1ns
S/H Droop Rate ——±1 µV/µs
Feedthrough — — ±0.01 %
A/D Conversion Time
+25°C —6 8 µs
–55 to +125°C ——10 µs
Throughput Rate
+25°C 50 66 —kHz
–55 to +125°C 33 — — kHz
DIGITAL INPUTS
Logic Levels
(Pins 8, 13–16, 19–21, 26, 31)
Logic 1 +2.0 —+5.5 Volts
Logic 0 0—+0.8 Volts
(Pin 5)
Logic 1 +4.0 —+5.5 Volts
Logic 0 0—+0.8 Volts
Logic Loading
(Pins 5, 8, 13–16, 19–21,
26, 31)
Logic 1 — — ±10 µA
Logic 0 — — ±10 µA
Multiplexer Address Set-up Time 20 ——ns
ENABLE to Data Valid Delay —20 30 ns
STROBE ➃ 40 ——ns
OUTPUTS
Logic Levels (Output Data)
Logic 1 +2.4 — — Volts
Logic 1 (pin 7) +2.5 — — Volts
Logic 0 — — +0.4 Volts
(Pins 9, 10, 11, and 12)
Logic 1 +2.5 — — Volts
Logic 0 — — +0.4 Volts
Logic Loading
Logic 1 — — –400 µA
Logic 0 ——+4 mA
Internal Reference:
Voltage, +25°C +9.99 +10.00 +10.01 Volts
Drift — — ±20 ppm/°C
External Current — — 1mA
Output Data Coding Straight binary (unipolar) or offset binary (bipolar)
ABSOLUTE MAXIMUM RATINGS
PARAMETERS MIN. TYP.MAX. UNITS
+15V Supply (pin 43) –0.5 —+18 Volts
–15V Supply (pin 44) +0.5 —–18 Volts
+5V Supply (pin 18) –0.5 —+7 Volts
Analog Inputs ➀–35 —+35 Volts
Digital Inputs –0.5 —+7 Volts
Thermal Resistances:
Junction-Case — — 15 °C/Watt
Case-Ambient — — 15 °C/Watt
Junction-Ambient — — 30 °C/Watt
Lead Temp. (10 seconds) — — 300 °C
ANALOG INPUTS MIN. TYP.MAX. UNITS
Signal Range, Unipolar
Gain = 1 0—+10 Volts
Gain = 200 — — +50 mV
Signal Range, Bipolar
Gain = 1 –10 —+10 Volts
Gain = 200 –50 —+50 mV
Input Gain Equation ➁Gain = 1 + (20kΩ/RGAIN)
Gain Equation Error — — ±0.1 %
Instrumentation Amplifier
Input Impedance 1081012 —Ohms
Input Bias Current:
+25°C — — ±250 pA
–55 to +125°C Doubles every 10°C
Input Offset Current:
+25°C — — ±1 nA
–55 to +125°C Doubles every 10°C
Multiplexer
Channel ON Resistance — — 2kΩ
Channel OFF Input Leakage —±30 —pA
Channel OFF Output Leakage —±1 —nA
Channel ON Leakage —±100 —pA
Input Capacitance
HDAS-16, Channel ON —100 —pF
HDAS-8, Channel ON —50 —pF
+25°C, Channel OFF —5—pF
Input Offset Voltage
Gain = 1, +25°C — — ±2 mV
–55 to +125°C (max.) (±3ppm/°C x Gain) ±20ppm/°C
Gain = 200, +25°C — — ±100 mV
–55 to +125°C (max.) (±3ppm/°C x Gain) ±20ppm/°C
Common Mode Range ±10 — — Volts
CMRR, Gain = 1, at 60Hz 70 82 —dB
Input Voltage Noise, Gain = 1
(Referred to input) —150 200 µVrms
Channel Crosstalk — — –80 dB
PERFORMANCE
Resolution 12 — — Bits
Integral Nonlinearity
0 to +70°C — — ±1 LSB
–55 to +125°C — — ±1 LSB
Differential Nonlinearity
0 to +70°C — — ±1 LSB
–55 to +125°C — — ±1 LSB
No Missing Codes Over the operating temperature range
FUNCTIONAL SPECIFICATIONS
(The following specifications apply over the operating temperature range and power
supply range unless otherwise indicated.)
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HDAS-16, HDAS-8
PIN NO. HDAS-16 HDAS-8
1CH3 IN CH3 HIGH IN
2CH2 IN CH2 HIGH IN
3CH1 IN CH1 HIGH IN
4CH0 IN CH0 HIGH IN
5MUX ENABLE *
6RDELAY*
7EOC *
8STROBE *
9A8 MULTIPLEXER *
10 A4 ADDRESS *
11 A2 OUT *
12 A1 *
13 RA8 MULTIPLEXER *
14 RA4 ADDRESS *
15 RA2 IN *
16 RA1 *
17 DIGITAL COMMON *
18 +5V SUPPLY*
19 LOAD *
20 CLEAR *
21 ENABLE (Bits 9–12) *
22 BIT 12 (LSB) *
23 BIT 11 *
24 BIT 10 *
25 BIT 9 *
26 ENABLE (Bits 5–8) *
27 BIT 8 *
28 BIT 7 *
29 BIT 6 *
30 BIT 5 *
31 ENABLE (Bits 1–4) *
32 BIT 4 *
33 BIT 3 *
34 BIT 2 *
35 BIT 1 (MSB) *
36 GAIN ADJUST *
37 OFFSET ADJUST *
38 BIPOLAR INPUT *
39 SAMPLE/HOLD OUT *
40 +10V REFERENCE OUT *
41 ANALOG SIGNAL COMMON *
42 ANALOG POWER COMMON *
43 +15V SUPPLY
44 –15V SUPPLY*
45 ANALOG SIGNAL COMMON *
46 ANALOG SIGNAL COMMON *
47 RGAIN LOW *
48 RGAIN HIGH *
49 AMP. IN HIGH ➀*
50 AMP. IN LOW ➀*
51 CH15 IN CH7 LOW IN
52 CH14 IN CH6 LOW IN
53 CH13 IN CH5 LOW IN
54 CH12 IN CH4 LOW IN
55 CH11 IN CH3 LOW IN
56 CH10 IN CH2 LOW IN
57 CH9 IN CH1 LOW IN
58 CH8 IN CH0 LOW IN
59 CH7 IN CH7 HIGH IN
60 CH6 IN CH6 HIGH IN
61 CH5 IN CH5 HIGH IN
62 CH4 IN CH4 HIGH IN
POWER REQUIREMENTS MIN. TYP.MAX. UNITS
Power Supply Ranges
+15V Supply +14.5 +15.0 +15.5 Volts
–15V Supply –14.5 –15.0 –15.5 Volts
+5V Suppy +4.75 +5.0 +5.25 Volts
Power Supply Currents
+15V Supply — — +33 mA
–15V Supply — — –30 mA
+5V Suppy — — +15 mA
Power Dissipation — — 1.25 Watts
PHYSICAL/ENVIRONMENTAL
Operating Temp. Range, Case
MC Models 0—+70 °C
MM/883 Models –55 —+125 °C
Storage Temperature Range –65 —+150 °C
Weight 1.4 ounces (39.7 grams)
Package Type 62-pin cermanic DIP
TECHNICAL NOTES
1. Input channels are protected to 20 Volts beyond the power
supplies. All digital output pins have one second short-
circuit protection.
2. To retain high system throughput rates while digitizing
low-level signals, apply external high-gain amplifiers for
each channel. DATEL’s AM-551 is suggested for such
amplifier-per-channel applications.
3. The HDAS devices have self-starting circuits for free-
running sequential operation. If, however, in a power-up
condition the supply voltage slew rate is less than 3V per
microsecond, the free running state might not be initialized.
Apply a negative pulse to the STROBE, to eliminate this
condition.
4. For unipolar operation, connect BIPOLAR INPUT (pin 38) to
S/H OUT (pin 39). For bipolar operation, connect BIPOLAR
INPUT (pin 38) to +10V REFERENCE OUT (pin 40).
5. RDELAY may be a standard value 5% carbon composition
or film-type resistor.
6. RGAIN must be very accurate with low temperature
coefficients. If necessary, fabricate the gain resistor from a
precision metal-film type in series with a low value trim
resistor or potentiometer. The total resistor temperature
coefficient must be no greater than ±10ppm/°C.
7. ANALOG SIGNAL COMMON, POWER COMMON and
DIGITAL COMMON are connected internally. For optimal
performance, tie all ground pins (17, 41, 42, 45, 46) directly
to a large analog ground plane beneath the package.
8. For HDAS-16, tie pin 50 to a “signal source common” if
possible. Otherwise tie pin 50 to pin 41 (ANA SIG COM).
Footnotes:
➀Analog inputs will withstand ±35V with power on. If the power is off, the maximum
safe input (no damage) is ±20V.
➁The gain equation error is guaranteed before external trimming and applies at
gains less than 50. This error increases at gains over 50.
➂Adjustable to zero.
➃STROBE pulse width must be less than EOC period to achieve maximum
throughput rate.
FUNCTIONAL SPECIFICATIONS (Continued)
*Same as HDAS-16
➀Caution: Pins 49 and 50 do not have overvoltage protection;
therefore, protected multiplexers, such as DATEL’s MX-1606 and
MX-808 are recommended. See the General Operation description.
INPUT/OUTPUT CONNECTIONS
DATEL, Inc.
, 11 Cabot Boulevard, Mansfield, MA 02048-1194 (U.S.A.) Tel: 508-339-3000 Fax: 508-339-6356 • For immediate assistance 800-233-2765
4
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HDAS-16, HDAS-8
CALIBRATION PROCEDURES
1. Offset and gain adjustments are made by connecting two
20k trim potentiometers as shown in Figure 2.
2. Connect a precision voltage source to pin 4 (CH0 IN). If the
HDAS-8 is used, connect pin 58 (CH0 LOW IN) to analog
ground. Ground pin 20 (CLEAR) and momentarily short pin
8 (STROBE). Trigger the A/D by connecting pin 7 (EOC) to
pin 8 (STROBE). Select proper value for RGAIN and
RDELAY by referring to Table 3.
3. Adjust the precision voltage source to the value shown in
Table 2 for the unipolar zero adjustment (ZERO + 1/2LSB)
or the bipolar offset adjustment (–FS + 1/2LSB). Adjust the
offset trim potentiometer so that the output code flickers
equally between 0000 0000 0000 and 0000 0000 0001.
4. Change the output of the precision voltage source to the
value shown in Table 2 for the unipolar or bipolar gain
adjustment (+FS – 1 1/2LSB). Adjust the gain trim
potentiometer so that the output flickers equally between
1111 1111 1110 and 1111 1111 1111.
UNIPOLAR RANGE ADJUST INPUT VOLTAGE
0 to +5V ZERO +0.6mV
GAIN +4.9982V
0 to +10V ZERO +1.2mV
GAIN +9.9963V
BIPOLAR RANGE
±2.5V OFFSET –2.4994V
GAIN +2.4982V
±5V OFFSET –4.9988V
GAIN +4.9963V
±10V OFFSET –9.9976V
GAIN +9.9927V
DIGITAL INPUTS
STROBE 1 to 0 Initiates acquisition and conversion
of analog signal
LOAD 0Random address mode initiated on
falling edge of STROBE
1Sequential address mode
CLEAR 0Allows next STROBE pulse to reset
MULTIPLEXER ADDRESS to CH0
overriding LOAD COMMAND
MUX ENABLE 0Disables internal multiplexer
1Enables internal multiplexer
MUX ADDRESS IN Selects channel for random
address mode 8, 4, 2, 1
natural binary coding
DIGITAL OUTPUTS
EOC (STATUS) 0Conversion complete
1Conversion in process
ENABLE (1–4) 0Enables three-state outputs bits 1-4
1Disables three-state outputs bits 1-4
ENABLE (5–8) 0Enables three-state outputs bits 5-8
1Disables three-state outputs bits 5-8
ENABLE (9–12) 0Enables three-state outputs bits 9-12
1Disables three-state outputs bits 9-12
MUX ADDRESS OUT Output of multiplexer address
register 8, 4, 2, 1 natural binary
coding
ANALOG INPUTS DESCRIPTION
CHANNEL INPUTS Limit voltage to ±20V beyond
power supplies
BIPOLAR INPUT For unipolar operation, connect
to pin 39 (S/H OUT). For bipolar
operation, connect to in 40
(+10V OUT)
AMP. IN LOW These pins are direct inputs to the
AMP. IN HIGH instrumentation amplifier for external
channel expansion beyond 16SE or
8D channels.
ANALOG OUTPUTS
S/H OUT Sample/hold output
+10V REFERENCE OUT Buffered +10V reference output
ADJUSTMENT PINS
ANALOG SIGNAL COMMON Low level analog signal return
GAIN ADJUSTMENT External gain adjustment.
See calibration instructions.
OFFSET ADJUSTMENT External offset adjustment.
See calibration instructions.
RGAIN Optional gain selection point. Factory
adjusted for G = 1 when left open.
RDELAY Optional acquisition time adjustment
when connected to +5V. Factory
adjusted for 9µs. Must be connected
to +5V either directly or through a
resistor.
Table 1. Description of Pin Functions Table 2. Calibration Table
LOGIC
FUNCTION STATE DESCRIPTION
GAIN
ADJUST
36 +15Vdc
OFFSET
ADJUST
20k
20k
37
–15Vdc
Figure 2. External Adjustment
GENERAL OPERATION
The HDAS devices accept either 16 single-ended or 8
differential input signals. For single-ended circuits, the AMP IN
LOW (pin 50) input to the instrumentation amplifier must
terminate at ANALOG SIGNAL COMMON (pin 41). For
differential circuits, both the HIGH and LOW signal inputs must
terminate externally for each channel. Tie unused channels to
the ANALOG SIGNAL COMMON (pin 41). To obtain additional
channels, connect external multiplexers to the AMP IN HIGH
(pin 49) and AMP IN LOW (pin 50). Using this scheme, the
HDAS-16 can provide 32 single-ended expansion channels
while the HDAS-8 can provide up to 16 differential expansion
channels. DATEL’s MX Series multiplexers are recommended.
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HDAS-16, HDAS-8
5 13 14 15 16
MUX
ENABLE RA8 RA4 RA2 RA1
The acquisition time is the amount of time the multiplexer,
instrumentation amplifier, and sample/hold require to settle
within a specified range of accuracy after STROBE (pin 8)
goes low. The acquisition time period can be observed by
measuring how long EOC is low after the falling edge of
STROBE (see Figure 4). For higher gains, increase the
acquisition time. Do this by connecting a resistor from
RDELAY (pin 6) to +5V (pin 18). An external resistor, RGAIN,
can be added to increase the gain value. The gain is equal to
1 without an RGAIN resistor. Table 3 refers to the appropriate
RDELAY and RGAIN resistors required for various gains.
The HDAS devices enter the hold mode and are ready for
conversion as soon as the one-shot (controlling acquisition
time) times out. An internal clock is gated ON, and a start-
convert pulse is sent to the 12-bit A/D converter, driving the
EOC output high.
The HDAS devices can be configured for either bipolar or
unipolar operation (see Table 2). The conversion is complete
within a maximum of 10 microseconds. The EOC now returns
low, the data is valid and sent to the three-state output buffers.
The sample/hold amplifier is now ready to acquire new data.
The next falling edge of the STROBE pulse repeats the
process for the next conversion.
MULTIPLEXER ADDRESSING
The HDAS devices can be configured in either random or
sequential addressing modes. Refer to Table 5 and the
subsequent descriptions. The number of channels sequentially
addressed can be truncated using the MUX ADDRESS OUT
(pins 9, 10, 11 and 12) and appropriate decoding circuitry for
the highest channel desired. The decoding circuit can drive
the CLEAR (pin 20) function low to reset the addressing to
channel 0.
UNIPOLAR STRAIGHT BINARY
INPUT 0 to +10V 0 to +5V MSB LSB
+FS – 1LSB +9.9976 +4.9988 1111 1111 1111
+1/2FS +5.0000 +2.5000 1000 0000 0000
+1LSB +0.0024 +0.0012 0000 0000 0001
ZERO 0.0000 0.0000 0000 0000 0000
Table 4. Output Coding Table 5. Mux Channel Addressing
PIN
ON
CHANNEL
HDAS-8
(3-BIT
ADDRESS)
MUX ADDRESS
0X X X X NONE
1 0 0 0 0 0
1 0 0 0 1 1
1 0 0 1 0 2
1 0 0 1 1 3
1 0 1 0 0 4
1 0 1 0 1 5
1 0 1 1 0 6
1 0 1 1 1 7
1 1 0 0 0 8
1 1 0 0 1 9
1 1 0 1 0 10
1 1 0 1 1 11
1 1 1 0 0 12
1 1 1 0 1 13
1 1 1 1 0 14
1 1 1 1 1 15
Table 3. Input Range Parameters (Typical)
INPUT SYSTEM ACCURACY
RANGE GAIN RGAIN (Ω)RDELAY (Ω) ➂THROUGHPUT ➃(% OF FSR)
±10V 1OPEN 0 (SHORT) 66.6kHz ±0.009
±5V 220.0k 0 (SHORT) 66.6kHz ±0.009
±2.5V 46.667k 0 (SHORT) 66.6kHz ±0.009
±1V 10 2.222k 0 (SHORT) 66.6kHz ±0.009
±200mV 50 408.2 7k 40.0kHz ±0.010
±100mV 100 202.0 21k 25.6kHz ±0.011
±50mV 200 100.5 51k 14.5kHz ±0.016
(GAIN – 1)
HDAS-16
(4-BIT
ADDRESS)
BIPOLAR OFFSET BINARY*
INPUT ±10V ±5V MSB LSB
+FS – 1LSB +9.9951 +4.9976 1111 1111 1111
+1/2FS +5.0000 +2.5000 1100 0000 0000
+1LSB +0.0049 +0.0024 1000 0000 0001
ZERO 0.0000 0.0000 1000 0000 0000
–FS + 1LSB –9.9951 –4.9976 0000 0000 0001
–FS –10.000 –5.0000 0000 0000 0000
* For 2’s complement coding, add an inverter to the MSB line.
Notes
RGAIN (Ω) = 20,000
RDELAY (Ω) = [Total Acquisition Delay (µs) x 1000] – 9000
➀The analog input range to the A/D converter is 0 to +10V for unipolar signals
and ±10V for bipolar signals.
➁Full scale can be accommodated for analog signal ranges of ±50mV to ±10V.
➂For gains between 1 and 10, RDELAY (pin 6) must be shorted to +5V (pin
18).
➃Throughput period equals acquisition and settling delay, plus A/D conversion
period (10 microseconds maximum).
➀ ➁
DATEL, Inc.
, 11 Cabot Boulevard, Mansfield, MA 02048-1194 (U.S.A.) Tel: 508-339-3000 Fax: 508-339-6356 • For immediate assistance 800-233-2765
6
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HDAS-16, HDAS-8
RANDOM ADDRESSING
Set pin 19 (LOAD) to logic 0. The next falling edge of STROBE
will load the MUX CHANNEL ADDRESS present on pin 13 to
pin 16. Digital address inputs must be stable 20ns before and
after falling edge of the STROBE pulse.
FREE RUNNING SEQUENTIAL ADDRESSING
Set pin 19 (LOAD) and pin 20 (CLEAR) to logic 1 or leave
open. Connect pin 7 (EOC) to pin 8 (STROBE). The falling
edge of EOC will increment channel address. This means that
when the EOC is low, the digital output data is valid for the
previous channel (CHn – 1) rather than the channel indicated
on MUX ADDRESS OUTPUT. The HDAS will continually scan
all channels.
Example:
CH4 has been addressed and a conversion takes place. The
EOC goes low. That channel’s (CH4’s) data becomes valid, but
MUX ADDRESS OUTPUT is now CH5.
TRIGGERED SEQUENTIAL ADDRESSING
Set pin 19 (LOAD) and pin 20 (CLEAR) to logic 1 or leave
open. Apply a falling edge trigger pulse to pin 8 (STROBE).
This negative transition causes the contents of the address
counter to be incremented by one, followed by an A/D
conversion in 9 microseconds.
INPUT VOLTAGE PROTECTION
As shown in Figure 3, the multiplexer has reversed biased
diodes which protect the input channels from being damaged
by overvoltage signals. The HDAS input channels are
protected up to 20V beyond the supplies and can be increased
by adding series resistors (Ri) to each channel. The input
resistor must limit the current flowing through the protection
diodes to 10mA.
The value of Ri for a specific voltage protection range (Vp) can
be calculated by the following formula:
Vp = (Rsignal + Ri + RON) (10mA)
where RON = 2k
NOTE: Increased input series resistance will increase
multiplexer settling time significantly.
Figure 4. HDAS Timing Diagram
Figure 3. Multiplexer Equivalent Circuit
CHn
INPUT
1k 1k
R2R1
+15V
–15V
100pF10pF
Ri
R
SIGNAL
SIGNAL
~
INST.
AMP.
STROBE
LOAD
40nsec min.
EOC
CLEAR
RA8
RA4
RA2
RA1
A8
A2
A1
A4
CH0
DATA VALID
40nsec min.
ACQUISITION
CH0 CONVERSION
CH0 ACQUISITION
CH1 CONVERSION
CH1
9µsec typ. 6µsec typ.
EXTERNAL
STROBE PULSE
CH12
DATA VALID
ACQUISITION
CH12 CONVERSION
CH12
40nsec min.
40nsec min.
CH12
SELECTED
t ≥ 20nsec min.
CH0 ADDRESSED
MODE CLEAR
CH1 ADDRESSED CH2 ADDRESSED CH12 ADDRESSED
SEQUENTIAL (EOC TIED TO STROBE) RANDOM
MAY CHANGE
OR DON'T CARE
CODE
t2t ,
1
t1t2≥50nsec
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HDAS-16, HDAS-8
MECHANICAL DIMENSIONS INCHES (mm)
ORDERING INFORMATION
Receptacles for PC board mounting can be ordered through AMP Inc.,
Part #3-331272-4 (Component Lead Spring Socket), 62 required.
Contact DATEL, Inc. for MIL-STD-883 product specifications.
MODEL NO. OPERATING TEMP. RANGE
HDAS-16MC 0 to +70°C
HDAS-16MM –55 to +125°C
HDAS-16/883 –55 to +125°C
HDAS-8MC 0 to +70°C
HDAS-8MM –55 to +125°C
HDAS-8/883 –55 to +125°C
Dimension Tolerances (unless otherwise indicated):
2 place decimal (.XX) ±0.010 (±0.254)
3 place decimal (.XXX) ±0.005 (±0.127)
Lead Material: Kovar alloy
Lead Finish: 50 microinches (minimum) gold plating
over 100 microinches (nominal) nickel plating
2.325
(59.055)
0.150
(3.810)
1.100
(27.940) 1.415 MAX.
(35.94)
0.150
(3.810)
0.200 MAX.
(5.080)
0.100 TYP.
(2.540)
2.00 ±0.008
(50.800)
0.235 MAX.
(5.969)
0.190 MAX.
(4.826) 0.020 ±0.002
(0.508) 0.040
(1.016) 0.150
(3.810) SEATING
PLANE
0.025 ±0.010
(0.635)
1.100 ±0.008
(27.940) 0.150
(3.810)
121
3252
62
DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151
Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356
Internet: www.datel.com Email: sales@datel.com
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.
DATEL (UK) LTD. Tadley, England Tel: (01256)-880444
DATEL S.A.R.L. Montigny Le Bretonneux, France Tel: 01-34-60-01-01
DATEL GmbH Munchen, Germany Tel: 89-544334-0
DATEL KK Tokyo, Japan Tel: 3-3779-1031, Osaka Tel: 6-354-2025
ISO 9001
ISO 9001
REGISTERED