®
®
DAC-HF
Ultra-Fast, 8/10/12-Bit Digital-to-Analog Converters
FEATURES
10 and 12-Bit resolutions
8,
Settling times to 25ns
±20ppm/°C max. gain tempco
Unipolar or bipolar operation
Current output
Internal feedback resistors
High-reliability MIL-STD-883 models
PIN
1
2
3
4
5
6
7
8
9
10
11
INPUT/OUTPUT CONNECTIONS
FUNCTION
PIN FUNCTION
BIT 1 (MSB)
BIT 2
BIT 3
BIT 4
BIT 5
BIT 6
BIT 7
BIT 8
BIT 9 *
BIT 10 *
BIT 11 *
24
23
22
21
20
19
18
17
16
15
14
13
+15V SUPPLY
GROUND
–15V SUPPLY
REFERENCE OUT
BIPOLAR OFFSET
10V RANGE
OUTPUT
20V RANGE
REFERENCE IN
GROUND
GROUND
GROUND
PRODUCT OVERVIEW
The DAC-HF Series of hybrid DAC’s are ultra
high-speed, current output devices. They incorpo-
rate state-of-the-art performance in a miniature
package, achieving maximum output settling times
of 25ns for the 8 and 10-bit models and 50ns
for the 12-bit model. They can be used to drive a
resistor load directly for up to ±1V output or a fast
operational ampifier (such as DATEL’s AM-500)
for higher voltage outputs with sub-microsecond
settling times. A tapped feedback resistor and a
bipolar offset resistor are included internally to
give five programmable output voltage ranges with
an external operational amplifier.
The DAC-HF design combines proven hybrid
construction techniques with advanced circuit
design to realize high-speed current switching.
The design incorporates fast PNP current switches
driving a low-impedance R-2R thin-film ladder
network. The nichrome thin-film resistor network
is deposited by electron beam evaporation on a
lowcapacitance substrate to assure high-speed
performance. The resistors are then functionally
trimmed by laser for optimum linearity.
12
BIT 12 (LSB) *
* See note in Figure 1
BLOCK DIAGRAM
+15V SUPPLY
24
–15V SUPPLY
22
GROUNDS
13 14 15 23
–10V
REFERENCE
4k
21
20
2k
REFERENCE OUT
(–10.05V±0.05V)
BIPOLAR
OFFSET
THIN-FILM R-2R
LADDER NETWORK
2k
17 20V RANGE
19 10V RANGE
18 OUTPUT
FAST PNP
CURRENT SWITCHES
REFERENCE
CONTROL
CIRCUIT
16 REFERENCE IN
PIN 1
BIT 1
MSB
9 10 8 1 127
1
6
5
4
3
2
8 9 10 11612 5
7
4
3
2
* * * *
LSB
* FOR DAC-HF10B, PINS 11 & 12 ARE NO CONNECTION
DIGITAL INPUTS
FOR DAC-HF8B, PINS 9, 10, 11 & 12 ARE NO CONNECTION
Figure 1. DAC-HF Functional Block Diagram
DATEL
•
11 Cabot Boulevard, Mansfield, MA 02048-1151 USA •
Tel: (508) 339-3000
•
www.datel.com
•
e-mail: help@datel.com
MDA_DAC-HF.B05
Page 1 of 5
®
®
DAC-HF
Ultra-Fast, 8/10/12-Bit Digital-to-Analog Converters
FUNCTIONAL SPECIFICATIONS
(Typical at +25°C and ±15V supplies unless otherwise noted.)
DESCRIPTION
INPUTS
Resolution, Bits
Coding, Unipolar Output
Coding, Bipolar Output
Input Logic Level, Bit ON ("1")
Input Logic Level, Bit OFF ("0")
PERFORMANCE
Nonlinearity Error, max.
TMIN to TMAX
Differential Nonlinearity Error, max.
TMIN to TMAX
Monotonicity
Gain Tempco, max.
Offset Tempco, Bipolar, max.
Zero Tempco, max.
Settling Time, ns max.
➂
Power Supply Sensitivity
OUTPUTS
Output Current Range, Unipolar
Output Current Range, Bipolar
Output Compliance Voltage
Output Voltage Ranges
➀
0 to +5mA
±2.5mA
±1.2V 0
to –5V 0
to –10V
±2.5V
±5V ±10V
400 Ohms
Output Resistance
Output Capacitance
Output Leakage Current, All Bits OFF
POWER REQUIREMENTS
Supply Voltages
Positive Quiescent Current, max.
Negative Quiescent Current, max.
PHYSICAL/ENVIRONMENTAL
Operating Temperature Range, Case
0°C to +70°C (BMC, BMC-C)
–40°C to +100°C (BME, BME-C)
– 55°C to +125°C (BMM, BMM-C, 883)
Storage Temperature Range
Package Type
Weight
–65°C to +150°C
24-pin ceramic DDIP
0.22 ounces (6.3 grams)
40mA
17mA
±15V ±0.5V
45mA
17mA
50mA
17mA
±10%
15pF
15nA
25
±0.012%
±0.024%
±0.012%
±0.024%
Guaranteed over oper. temp. range
±20ppm/°C
±10ppm/°C of FSR
➁
±1.5ppm/°C of FSR
➁
25
±0.01%/% Supply
50
8
10
Straight binary
Offset binary
+2.0V to +5.5V at +40μA
0V to +0.8V at –2.6mA
12
8B
10B
12B
ABSOLUTE MAXIMUM RATINGS
PARAMETERS
LIMITS
Positive Supply, Pin 24
+18
Negative Supply, Pin 22
–18
Digital Input Voltage, Pins 1–12
+15
Lead Temperature (soldering, 10s)
300
UNITS
Volts
Volts
Volts
Volts
TECHNICAL NOTES
1. Proper operation of the DAC-HF Series converters is dependent on good
board layout and connection practices. Bypass supplies as shown in the con-
nection diagrams. Mount bypass capacitors close to the converter, directly to
the supply pins where possible.
2. Use of a ground plane is particularly important in highspeed D/A converters
as it reduces high-frequency noise and aids in decoupling the digital inputs
from the analog output. Avoid ground loop problems by connecting all grounds
on the board to the ground plane. The remainder of the ground plane should
include as much of the circuit board as possible.
3. When the converter is configured for voltage output with an external
operational amplifier, keep the leads from the converter to the output amplifier
as short as possible.
4. The high-speed current switching technique used in the DAC-HF Series
inherently reduces the amplitude and duration of large transient spikes at
the output (“glitches”). The most severe glitches occur at half-scale, the
major carry transition from 011 … 1 to 100 … 0 or vice versa. At this time, a
skewing of the input codes can create a transition state code of 111 … 1. The
duration of the “transition state code” is dependent on the degree of skewing,
but its effect is dependent on the speed of the DAC (an ultra-fast DAC will
respond to these brief spurious inputs to a greater degree than a slow DAC).
Minimize the effects of input skewing by using a highspeed input register to
match input switching times. The input register recommended for use with
the DAC-HF is easily implemented with two Texas Instruments SN74S174
hex D-type flip-flops. This register will reduce glitches to a very low level and
ensure fast output settling times.
5. Test the DAC-HF using a low-capacitance test probe (such as a 10X probe).
Take care to assure the shortest possible connection between probe ground
and circuit ground. Long probe ground leads may pick up environmental E.M.I.
causing artifacts on the scope display, i.e., signals that do not originate at the
unit under test.
6. Passive components used with the DAC-HF may be as indicated here:
0.1μF and 1μF bypass capacitors should be ceramic type and tantalum type
respectively; the 400Ω output load is a ±0.1%, 10ppm/°C, metal-film type;
adjustment potentiometers are ceremet types; other resistors may be ±10%
carbon composition types.
7. Output voltage compliance is ±1.2V to preserve the linearity of the con-
verter. In the bipolar mode, the DAC-HF can be operated with no load to give
an output voltage of ±1.0V. In the unipolar mode, the load resistance must be
less than 600Ω to give less than +1.2V output. The specified output currents
of 0 to +5mA and ±2.5mA are measured into a short circuit or an operational
amplifier summing junction.
Footnotes:
➀
With external operational amplifier.
➁
FSR is Full Scale Range, or the difference between minimum and maximum
output values.
➂
Full-scale current change to ±1LSB with 400Ω load.
DATEL
•
11 Cabot Boulevard, Mansfield, MA 02048-1151 USA •
Tel: (508) 339-3000
•
www.datel.com
•
e-mail: help@datel.com
MDA_DAC-HF.B05
Page 2 of 5
®
®
DAC-HF
Ultra-Fast, 8/10/12-Bit Digital-to-Analog Converters
0.1μF
+
+15V
1μF
+15V
24
1
19
17
18
I
OUT
20
21
100
16
15
400 LOAD
(FOR 0 TO
+1V FS)
2M
ZERO
ADJUST
25k
–15V
OUTPUT
CALIBRATION PROCEDURE
Unipolar Output Current
1. Connect the converter as shown in Figure 2.
2. Set all inputs low and adjust the ZERO ADJUST potentiometer for a reading
of 0V at the output.
3. Set all inputs high and adjust the GAIN ADJUST potentiometer for a read-
ing of –F.S. + 1LSB (See Table 1).
Bipolar Output Current
1. Connect the converter as shown in Figure 3.
2. Set all inputs low and adjust the OFFSET ADJUST and LOAD potentiometer
for an output reading of +F.S. (See Table 2).
3. Set all inputs high and adjust the GAIN ADJUST potentiometer for an
output reading of –F.S. + 1LSB (See Table 2).
BIT 12
+15V
1μF
12
23
22
BIT 1
GAIN
ADJUST
14
13
–15V
0.1μF
+
0.1μF
+
1μF
BIT 1
24
1
19
17
18
100
200
20
21
100
16
15
14
12
OFFSET
ADJUST
370
LOAD
(444 NOMINAL)
(FOR 0 TO ±0.5V FS)
I
OUT
OUTPUT
Figure 2. DAC-HF Calibration Circuit
Table 1. 12-Bit Unipolar Output Coding
UNIPOLAR SCALE
–F.S. + 1LSB
GAIN
ADJUST
INPUT CODING
STRAIGHT BINARY
1111 1111 1111
1100 0000 0000
1000 0000 0000
0100 0000 0000
0000 0000 0001
0000 0000 0000
ANALOG OUTPUT
0 TO 1V F.S. 0 TO –5V F.S. 0 TO –10V F.S.
+0.9998V
+0.7500V
+0.5000V
+2.5000V
+0.0002V
0.0000V
–4.9988V
–3.7500V
–2.5000V
–1.2500V
–0.0012V
0.0000V
–9.9976V
–7.5000V
–5.0000V
–2.5000V
–0.0024V
0.0000V
–3/4F.S.
–1/2F.S.
–1/4F.S.
–1LSB
0
BIT 12
23
22
13
–15V
0.1μF
+
Table 2. 12-Bit Bipolar Output Coding
BIPOLAR
SCALE
–F.S. + 1LSB
–1/2F.S.
–1LSB
0
+1/2F.S.
+F.S. – 1LSB
+F.S.
INPUT CODING
OFFSET BINARY
1111 1111 1111
1100 0000 0000
1000 0000 0001
1000 0000 0000
0100 0000 0000
0000 0000 0001
0000 0000 0000
ANALOG OUTPUT
±0.5V F.S.
+0.4998V
+0.1250V
+0.0002V
0.0000V
–0.1250V
–0.4998V
–0.5000V
±2.5V F.S.
–2.4988V
–1.2500V
–0.0012V
0.0000V
+1.2500V
+2.4988V
+2.5000V
±5V F.S.
–4.9976V
–2.5000V
–0.0024V
0.0000V
+2.5000V
+4.9976V
+5.0000V
±10V F.S.
–9.9951V
–5.0000V
–0.0049V
0.0000V
+5.0000V
+9.9951V
+10.0000V
1μF
Figure 3. Bipolar Current Output Connections
Table 3. Programmable Output Range Pin Connections
OUTPUT VOLTAGE
RANGE
0 to –5V
0 to –10V
±2.5V
±5V
±10V
FEEDBACK
CONNECTIONS
PIN 19
PIN 19
PIN 19
PIN 19
PIN 17
CONNECT THESE
PINS TOGETHER
PIN 17 to PIN 18 / PIN 20 to PIN 23
PIN 20 to PIN 23
PIN 17 to PIN 18 / PIN 20 to PIN 18
PIN 20 to PIN 18
PIN 20 to PIN 18
DATEL
•
11 Cabot Boulevard, Mansfield, MA 02048-1151 USA •
Tel: (508) 339-3000
•
www.datel.com
•
e-mail: help@datel.com
MDA_DAC-HF.B05
Page 3 of 5
®
®
DAC-HF
Ultra-Fast, 8/10/12-Bit Digital-to-Analog Converters
4k = 0.1%
20
21
19
2k
2k
17
BIPOLAR
OFFSET
REF OUT
(–10V = 2%)
4k FEEDBACK
(20V RANGE)
18 OUTPUT
5mA
400
±10%
23 GROUND
2V/DIV
50nsec/DIV
2V/DIV
2k FEEDBACK
(10V RANGE)
50nsec/DIV
DAC-HF with AM-500, ±5V output full scale (10V) step
Figure 4. Equivalent Output Circuit
Figure 5. Voltage Output Waveforms
OUTPUT
STEP
20V
10V
5V
TYPICAL SETTLING
TIME TO 1LSB
300ns
200ns
150ns
OUTPUT
STEP
20V
10V
5V
TYPICAL SETTLING
TIME TO 1LSB
2μs
600ns
400ns
Figure 6. Unipolar Ultra-Fast Voltage Output Circuit
Figure 7. Unipolar Fast Voltage Output Circuit
DATEL
•
11 Cabot Boulevard, Mansfield, MA 02048-1151 USA •
Tel: (508) 339-3000
•
www.datel.com
•
e-mail: help@datel.com
MDA_DAC-HF.B05
Page 4 of 5
®
®
DAC-HF
Ultra-Fast, 8/10/12-Bit Digital-to-Analog Converters
MECHANICAL DIMENSIONS INCHES (mm)
1.31 MAX.
(33.27)
Dimension Tolerances
(unless otherwise indicated):
2 place decimal (.XX) ±0.010 (±0.254)
3 place decimal (.XXX) ±0.005 (±0.127)
0.80 MAX.
(20.32)
Lead Material:
Kovar alloy
Lead Finish:
50 microinches (minimum) gold plating
over 100 microinches (nominal) nickel plating
24
13
1
12
0.100 TYP.
(2.540)
1.100
(27.940)
0.235 MAX.
(5.969)
0.200 MAX.
(5.080)
0.010
–0.001
(0.254)
0.190 MAX.
(4.826)
0.018 ±0.002
(0.457)
0.100
(2.540)
0.040
(1.016)
+0.002
SEATING
PLANE
0.025
(0.635)
0.600 ±0.010
(15.240)
0.100
(2.540)
ORDERING INFORMATION
OPERATING
MODEL NUMBER
TEMP. RANGE
DAC-HF8BMC
0 TO +70°C
DAC-HF8BME
DAC-HF8BMM
DAC-HF8/883
DAC-HF10BMC
DAC-HF10BMM
DAC-HF10BME
DAC-HF10/883
DAC-HF12BMC
DAC-HF12BME
DAC-HF12BMM
DAC-HF12BMM-QL
DAC-HF12/883
DAC-HF8BMC-C
DAC-HF8BME-C
DAC-HF8BMM-C
DAC-HF10BMC-C
DAC-HF10BME-C
DAC-HF10BMM-C
DAC-HF12BMC-C
DAC-HF12BME-C
DAC-HF12BMM-C
DAC-HF12BMM-QL-C
DAC-HF12-C/883
–40 TO +100°C
–55 TO +125°C
–55 TO +125°C
0 TO +70°C
–55 TO +125°C
–40 TO +100°C
–55 TO +125°C
0 TO +70°C
–40 TO +100°C
–55 TO +125°C
–55 TO +125°C
–55 TO +125°C
0 TO +70°C
–40 TO +100°C
–55 TO +125°C
0 TO +70°C
–40 TO +100°C
–55 TO +125°C
0 TO +70°C
–40 TO +100°C
–55 TO +125°C
–55 TO +125°C
–55 TO +125°C
BITS
8
8
8
8
10
10
10
10
12
12
12
12
12
8
8
8
10
10
10
12
12
12
12
12
ROHS
No
No
No
No
No
No
No
No
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
DATEL
11 Cabot Boulevard, Mansfield, MA 02048-1151 USA
ITAR and ISO 9001/14001 REGISTERED
. 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.
© 2013
www.datel.com • e-mail: help@datel.com
MDA_DAC-HF.B05
Page 5 of 5
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