®
®
HDAS-16, HDAS-8
12-Bit, 50kHz, Complete
Data Acquisition Systems
IN N O V AT IO N a n d E X C E L L E N C E
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
5
49 50
48
47
45
46
39
40 38 36 37
OFFSET ADJUST
BIPOLAR INPUT
+10V REF OUT
ANA SIG COM
ANA SIG COM
GAIN ADJUST
MUX ENABLE
AMP IN LO
RGAIN LO
AMP IN HI
RGAIN HI
S/H OUT
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
I/A
16 CHANNEL
SINGLE ENDED
OR
8 CHANNEL
DIFFERENTIAL
ANALOG
MULTIPLEXER
S/H
12-BIT
A/D
CONVERTER
THREE
STATE
(HOLD)
(START)
THREE
STATE
CONTROL
LOGIC
MUX
ADDRESS
REGISTER
+5V SUPPLY
12 11 10
A1
A2
A4
9
A8
6
RDELAY
8
STROBE
19
LOAD
16 15 1413
RA1
RA2
RA4
RA8
20
CLEAR
41
ANA SIG COM
44 42
–15V SUPPLY
ANA PWR COM
43 18 17
+15V SUPPLY
DIG COM
MUX
ADDRESS OUT
MUX
ADDRESS IN
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
THREE STATE OUTPUT DATA
(BUFFERED)
THREE
STATE
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
HDAS-16, HDAS-8
ABSOLUTE MAXIMUM RATINGS
PARAMETERS
+15V Supply (pin 43)
–15V Supply (pin 44)
+5V Supply (pin 18)
Analog Inputs
Digital Inputs
Thermal Resistances:
Junction-Case
Case-Ambient
Junction-Ambient
Lead Temp. (10 seconds)
MIN.
–0.5
+0.5
–0.5
–35
–0.5
—
—
—
—
TYP.
—
—
—
—
—
—
—
—
—
MAX.
+18
–18
+7
+35
+7
15
15
30
300
UNITS
Volts
Volts
Volts
Volts
Volts
°C/Watt
°C/Watt
°C/Watt
°C
PERFORMANCE (cont.)
Unipolar Zero Error
+25°C
–55 to +125°C
Bipolar Zero Error
+25°C
–55 to +125°C
Bipolar Offset Error
+25°C
–55 to +125°C
Gain Error
+25°C
–55 to +125°C
DYNAMIC CHARACTERISTICS
Acquisition Time, Gain = 1
+25°C
–55 to +125°C
Aperture Delay Time
Aperture Uncertainty
S/H Droop Rate
Feedthrough
A/D Conversion Time
+25°C
–55 to +125°C
Throughput Rate
+25°C
–55 to +125°C
DIGITAL INPUTS
Logic Levels
(Pins 8, 13–16, 19–21, 26, 31)
Logic 1
Logic 0
(Pin 5)
Logic 1
Logic 0
Logic Loading
(Pins 5, 8, 13–16, 19–21,
26, 31)
Logic 1
Logic 0
Multiplexer Address Set-up Time
ENABLE to Data Valid Delay
STROBE
OUTPUTS
Logic Levels
(Output Data)
Logic 1
Logic 1 (pin 7)
Logic 0
(Pins 9, 10, 11, and 12)
Logic 1
Logic 0
Logic Loading
Logic 1
Logic 0
Internal Reference:
Voltage, +25°C
Drift
External Current
Output Data Coding
+2.4
+2.5
—
+2.5
—
—
—
—
—
—
—
—
—
—
—
50
33
MIN.
—
—
—
—
—
—
—
—
®
®
TYP.
—
—
—
—
—
—
—
—
MAX.
±0.1
±0.3
±0.1
±0.3
±0.1
±0.3
±0.2
±0.3
UNITS
%FSR
%FSR
%FSR
%FSR
%FSR
%FSR
%
%
FUNCTIONAL SPECIFICATIONS
(The following specifications apply over the operating temperature range and power
supply range unless otherwise indicated.)
ANALOG INPUTS
Signal Range, Unipolar
Gain = 1
Gain = 200
Signal Range, Bipolar
Gain = 1
Gain = 200
Input Gain Equation
Gain Equation Error
Instrumentation Amplifier
Input Impedance
Input Bias Current:
+25°C
–55 to +125°C
Input Offset Current:
+25°C
–55 to +125°C
Multiplexer
Channel ON Resistance
Channel OFF Input Leakage
Channel OFF Output Leakage
Channel ON Leakage
Input Capacitance
HDAS-16, Channel ON
HDAS-8, Channel ON
+25°C, Channel OFF
Input Offset Voltage
Gain = 1,
+25°C
–55 to +125°C (max.)
Gain = 200,
+25°C
–55 to +125°C (max.)
Common Mode Range
CMRR, Gain = 1, at 60Hz
Input Voltage Noise, Gain = 1
(Referred to input)
Channel Crosstalk
PERFORMANCE
Resolution
Integral Nonlinearity
0 to +70°C
–55 to +125°C
Differential Nonlinearity
0 to +70°C
–55 to +125°C
No Missing Codes
12
—
—
—
—
—
—
±1
±1
Bits
LSB
LSB
MIN.
0
—
–10
–50
—
10
8
—
TYP.
—
—
MAX.
+10
+50
UNITS
Volts
mV
Volts
mV
%
Ohms
pA
—
+10
—
+50
Gain = 1 + (20kΩ/RGAIN)
—
±0.1
10
12
—
9
—
—
—
—
—
6
—
66
—
10
15
500
1
±1
±0.01
8
10
—
—
µs
µs
ns
ns
µV/µs
%
µs
µs
kHz
kHz
—
±250
Doubles every 10°C
—
±1
Doubles every 10°C
—
±30
±1
±100
100
50
5
2
—
—
—
—
—
—
—
nA
+2.0
0
+4.0
0
—
—
—
—
+5.5
+0.8
+5.5
+0.8
Volts
Volts
Volts
Volts
—
—
—
—
—
—
—
—
kΩ
pA
nA
pA
pF
pF
pF
—
±2
mV
(±3ppm/°C x Gain) ±20ppm/°C
—
—
±100
mV
(±3ppm/°C x Gain) ±20ppm/°C
±10
—
—
Volts
70
82
—
dB
—
—
150
—
200
–80
µVrms
dB
—
—
20
—
40
—
—
—
20
—
±10
±10
—
30
—
µA
µA
ns
ns
ns
—
—
—
—
—
—
—
—
—
+0.4
—
+0.4
–400
+4
Volts
Volts
Volts
Volts
Volts
µA
mA
—
—
±1
LSB
—
—
±1
LSB
Over the operating temperature range
+9.99
+10.00
+10.01
Volts
—
—
±20
ppm/°C
—
—
1
mA
Straight binary (unipolar) or offset binary (bipolar)
2
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
®
®
HDAS-16, HDAS-8
INPUT/OUTPUT CONNECTIONS
UNITS
Volts
Volts
Volts
mA
mA
mA
Watts
PIN NO.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
HDAS-16
CH3 IN
CH2 IN
CH1 IN
CH0 IN
MUX ENABLE
RDELAY
EOC
STROBE
A8
MULTIPLEXER
A4
ADDRESS
A2
OUT
A1
RA8
MULTIPLEXER
RA4
ADDRESS
RA2
IN
RA1
DIGITAL COMMON
+5V SUPPLY
LOAD
CLEAR
ENABLE (Bits 9–12)
BIT 12 (LSB)
BIT 11
BIT 10
BIT 9
ENABLE (Bits 5–8)
BIT 8
BIT 7
BIT 6
BIT 5
ENABLE (Bits 1–4)
BIT 4
BIT 3
BIT 2
BIT 1 (MSB)
GAIN ADJUST
OFFSET ADJUST
BIPOLAR INPUT
SAMPLE/HOLD OUT
+10V REFERENCE OUT
ANALOG SIGNAL COMMON
ANALOG POWER COMMON
+15V SUPPLY
–15V SUPPLY
ANALOG SIGNAL COMMON
ANALOG SIGNAL COMMON
RGAIN LOW
RGAIN HIGH
AMP. IN HIGH
AMP. IN LOW
CH15 IN
CH14 IN
CH13 IN
CH12 IN
CH11 IN
CH10 IN
CH9 IN
CH8 IN
CH7 IN
CH6 IN
CH5 IN
CH4 IN
HDAS-8
CH3
CH2
CH1
CH0
HIGH
HIGH
HIGH
HIGH
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
IN
IN
IN
IN
FUNCTIONAL SPECIFICATIONS
(Continued)
POWER REQUIREMENTS
Power Supply Ranges
+15V Supply
–15V Supply
+5V Suppy
Power Supply Currents
+15V Supply
–15V Supply
+5V Suppy
Power Dissipation
PHYSICAL/ENVIRONMENTAL
Operating Temp. Range, Case
MC Models
MM/883 Models
Storage Temperature Range
Weight
Package Type
Footnotes:
Analog inputs will withstand ±35V with power on. If the power is off, the maximum
safe input (no damage) is ±20V.
The gain equation error is guaranteed before external trimming and applies at
gains less than 50. This error increases at gains over 50.
Adjustable to zero.
STROBE pulse width must be less than EOC period to achieve maximum
throughput rate.
0
–55
–65
—
+70
—
+125
—
+150
1.4 ounces (39.7 grams)
62-pin cermanic DIP
°C
°C
°C
MIN.
+14.5
–14.5
+4.75
—
—
—
—
TYP.
+15.0
–15.0
+5.0
—
—
—
—
MAX.
+15.5
–15.5
+5.25
+33
–30
+15
1.25
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).
CH7
CH6
CH5
CH4
CH3
CH2
CH1
CH0
CH7
CH6
CH5
CH4
*
*
*
*
*
*
*
LOW IN
LOW IN
LOW IN
LOW IN
LOW IN
LOW IN
LOW IN
LOW IN
HIGH IN
HIGH IN
HIGH IN
HIGH IN
* Same as HDAS-16
Caution: 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.
3
HDAS-16, HDAS-8
Table 1. Description of Pin Functions
FUNCTION
DIGITAL INPUTS
STROBE
LOAD
1 to 0
0
1
CLEAR
0
Initiates acquisition and conversion
of analog signal
Random address mode initiated on
falling edge of STROBE
Sequential address mode
Allows next STROBE pulse to reset
MULTIPLEXER ADDRESS to CH0
overriding LOAD COMMAND
Disables internal multiplexer
Enables internal multiplexer
Selects channel for random
address mode 8, 4, 2, 1
natural binary coding
0
1
ENABLE (1–4)
ENABLE (5–8)
ENABLE (9–12)
MUX ADDRESS OUT
0
1
0
1
0
1
Conversion complete
Conversion in process
Enables three-state outputs bits 1-4
Disables three-state outputs bits 1-4
Enables three-state outputs bits 5-8
Disables three-state outputs bits 5-8
Enables three-state outputs bits 9-12
Disables three-state outputs bits 9-12
Output of multiplexer address
register 8, 4, 2, 1 natural binary
coding
DESCRIPTION
Limit voltage to ±20V beyond
power supplies
For unipolar operation, connect
to pin 39 (S/H OUT). For bipolar
operation, connect to in 40
(+10V OUT)
These pins are direct inputs to the
instrumentation amplifier for external
channel expansion beyond 16SE or
8D channels.
Sample/hold output
Buffered +10V reference output
LOGIC
STATE DESCRIPTION
®
®
Table 2. Calibration Table
UNIPOLAR RANGE
0 to +5V
0 to +10V
BIPOLAR RANGE
±2.5V
±5V
±10V
ADJUST
ZERO
GAIN
ZERO
GAIN
INPUT VOLTAGE
+0.6mV
+4.9982V
+1.2mV
+9.9963V
OFFSET
GAIN
OFFSET
GAIN
OFFSET
GAIN
–2.4994V
+2.4982V
–4.9988V
+4.9963V
–9.9976V
+9.9927V
MUX ENABLE
MUX ADDRESS IN
0
1
DIGITAL OUTPUTS
EOC (STATUS)
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.
GAIN
ADJUST
36
20k
+15Vdc
ANALOG INPUTS
CHANNEL INPUTS
BIPOLAR INPUT
AMP. IN LOW
AMP. IN HIGH
ANALOG OUTPUTS
S/H OUT
+10V REFERENCE OUT
ADJUSTMENT PINS
ANALOG SIGNAL COMMON
GAIN ADJUSTMENT
OFFSET ADJUSTMENT
RGAIN
RDELAY
Low level analog signal return
External gain adjustment.
See calibration instructions.
External offset adjustment.
See calibration instructions.
Optional gain selection point. Factory
adjusted for G = 1 when left open.
Optional acquisition time adjustment
when connected to +5V. Factory
adjusted for 9µs. Must be connected
to +5V either directly or through a
resistor.
37
OFFSET
ADJUST
20k
–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.
4
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
®
®
HDAS-16, HDAS-8
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.
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.
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.
Table 3. Input Range Parameters (Typical)
INPUT
RANGE
±10V
±5V
±2.5V
±1V
±200mV
±100mV
±50mV
Notes
RGAIN (Ω) =
20,000
(GAIN – 1)
GAIN
1
2
4
10
50
100
200
RGAIN (Ω )
OPEN
20.0k
6.667k
2.222k
408.2
202.0
100.5
RDELAY (Ω )
0
0
0
0
(SHORT)
(SHORT)
(SHORT)
(SHORT)
7k
21k
51k
THROUGHPUT
66.6kHz
66.6kHz
66.6kHz
66.6kHz
40.0kHz
25.6kHz
14.5kHz
SYSTEM ACCURACY
(% OF FSR)
±0.009
±0.009
±0.009
±0.009
±0.010
±0.011
±0.016
RDELAY (Ω) = [Total Acquisition Delay (µs) x 1000] – 9000
The analog input range to the A/D converter is 0 to +10V for unipolar signals
and ±10V for bipolar signals.
Full scale can be accommodated for analog signal ranges of ±50mV to ±10V.
For gains between 1 and 10, RDELAY (pin 6) must be shorted to +5V (pin
18).
Throughput period equals acquisition and settling delay, plus A/D conversion
period (10 microseconds maximum).
Table 5. Mux Channel Addressing
PIN
MUX ADDRESS
5
MUX
ENABLE
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
13
RA8
X
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
14
RA4
X
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
15
RA2
X
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
16
RA1
X
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
ON
CHANNEL
NONE
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
HDAS-8
(3-BIT
ADDRESS)
HDAS-16
(4-BIT
ADDRESS)
Table 4. Output Coding
UNIPOLAR
INPUT
+FS – 1LSB
+1/2FS
+1LSB
ZERO
0 to +10V
+9.9976
+5.0000
+0.0024
0.0000
0 to +5V
+4.9988
+2.5000
+0.0012
0.0000
STRAIGHT BINARY
MSB
1111
1000
0000
0000
1111
0000
0000
0000
LSB
1111
0000
0001
0000
BIPOLAR
INPUT
+FS – 1LSB
+1/2FS
+1LSB
ZERO
–FS + 1LSB
–FS
±10V
+9.9951
+5.0000
+0.0049
0.0000
–9.9951
–10.000
±5V
+4.9976
+2.5000
+0.0024
0.0000
–4.9976
–5.0000
OFFSET BINARY*
MSB
1111
1100
1000
1000
0000
0000
1111
0000
0000
0000
0000
0000
LSB
1111
0000
0001
0000
0001
0000
* For 2’s complement coding, add an inverter to the MSB line.
5
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