DAC-HF Series

®
DAC-HF
®
Ultra-Fast, 8/10/12-Bit Digital-to-Analog Converters
FEATURES

8, 10 and 12-Bit resolutions

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
PRODUCT OVERVIEW
INPUT/OUTPUT CONNECTIONS
FUNCTION
PIN FUNCTION
1
BIT 1 (MSB)
24
+15V SUPPLY
2
BIT 2
23
GROUND
3
BIT 3
22
–15V SUPPLY
4
BIT 4
21
REFERENCE OUT
5
BIT 5
20
BIPOLAR OFFSET
6
BIT 6
19
10V RANGE
7
BIT 7
18
OUTPUT
8
BIT 8
17
20V RANGE
9
BIT 9 *
16
REFERENCE IN
10
BIT 10 *
15
GROUND
11
BIT 11 *
14
GROUND
13
GROUND
12
BIT 12 (LSB) *
* See note in Figure 1
The DAC-HF Series of hybrid DAC’s are ultra
high-speed, current output devices. They incorporate 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.
BLOCK DIAGRAM
+15V SUPPLY
24
–15V SUPPLY
22
GROUNDS
13 14 15 23
–10V
REFERENCE
4k
THIN-FILM R-2R
LADDER NETWORK
2k
2k
21
REFERENCE OUT
(–10.05V±0.05V)
20
BIPOLAR
OFFSET
17 20V RANGE
19 10V RANGE
18 OUTPUT
FAST PNP
CURRENT SWITCHES
PIN 1
BIT 1
REFERENCE
CONTROL
CIRCUIT
16 REFERENCE IN
9 10 811 127
6
5
4
3
2
8 9 10
7 11612 5
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
MSB
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: [email protected]
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
8B
10B
12B
INPUTS
Resolution, Bits
8
10
12
Coding, Unipolar Output
Straight binary
Coding, Bipolar Output
Offset binary
Input Logic Level, Bit ON ("1")
+2.0V to +5.5V at +40μA
Input Logic Level, Bit OFF ("0")
0V to +0.8V at –2.6mA
Nonlinearity Error, max.
±0.012%
TMIN to TMAX
Differential Nonlinearity Error, max.
±0.012%
TMIN to TMAX
±0.024%
Monotonicity
Guaranteed over oper. temp. range
±0.024%
±20ppm/°C
±10ppm/°C of FSR ➁
Offset Tempco, Bipolar, max.
±1.5ppm/°C of FSR ➁
Zero Tempco, max.
Settling Time, ns max. ➂
25
25
Power Supply Sensitivity
50
±0.01%/% Supply
OUTPUTS
Output Current Range, Unipolar
0 to +5mA
Output Current Range, Bipolar
±2.5mA
Output Compliance Voltage
±1.2V 0
Output Voltage Ranges ➀
to –5V 0
±2.5V
±5V ±10V
400 Ohms
±10%
Output Capacitance
15pF
Output Leakage Current, All Bits OFF
15nA
POWER REQUIREMENTS
Supply Voltages
±15V ±0.5V
Positive Quiescent Current, max.
40mA
45mA
50mA
Negative Quiescent Current, max.
17mA
17mA
17mA
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)
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
•
TECHNICAL NOTES
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.
to –10V
Output Resistance
UNITS
Volts
Volts
Volts
Volts
1. Proper operation of the DAC-HF Series converters is dependent on good
board layout and connection practices. Bypass supplies as shown in the connection diagrams. Mount bypass capacitors close to the converter, directly to
the supply pins where possible.
PERFORMANCE
Gain Tempco, max.
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
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 converter. 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.
11 Cabot Boulevard, Mansfield, MA 02048-1151 USA
•
Tel: (508) 339-3000
•
www.datel.com
•
e-mail: [email protected]
MDA_DAC-HF.B05 Page 2 of 5
®
DAC-HF
®
Ultra-Fast, 8/10/12-Bit Digital-to-Analog Converters
CALIBRATION PROCEDURE
+
0.1μF
Unipolar Output Current
+15V
1μF
+15V
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.
ZERO
ADJUST
25k
24
BIT 1
19
1
2M
17
–15V
18
3. Set all inputs high and adjust the GAIN ADJUST potentiometer for a reading of –F.S. + 1LSB (See Table 1).
I OUT
400 LOAD
(FOR 0 TO
+1V FS)
20
Bipolar Output Current
OUTPUT
21
1. Connect the converter as shown in Figure 3.
100
2. Set all inputs low and adjust the OFFSET ADJUST and LOAD potentiometer
for an output reading of +F.S. (See Table 2).
GAIN
ADJUST
16
15
3. Set all inputs high and adjust the GAIN ADJUST potentiometer for an
output reading of –F.S. + 1LSB (See Table 2).
14
12
BIT 12
0.1μF
BIT 1
+
13
–15V
+15V
0.1μF
1μF
+
1μF
Figure 2. DAC-HF Calibration Circuit
24
19
1
17
OUTPUT
I OUT
18
Table 1. 12-Bit Unipolar Output Coding
100
200
100
22
GAIN
ADJUST
–F.S. + 1LSB
1111 1111 1111
+0.9998V
–4.9988V
–9.9976V
–3/4F.S.
1100 0000 0000
+0.7500V
–3.7500V
–7.5000V
–1/2F.S.
1000 0000 0000
+0.5000V
–2.5000V
–5.0000V
–1/4F.S.
0100 0000 0000
+2.5000V
–1.2500V
–2.5000V
14
–1LSB
0000 0000 0001
+0.0002V
–0.0012V
–0.0024V
0
0000 0000 0000
0.0000V
0.0000V
0.0000V
13
Table 2. 12-Bit Bipolar Output Coding
–15V
0.1μF
+
0 TO 1V F.S. 0 TO –5V F.S. 0 TO –10V F.S.
15
16
23
ANALOG OUTPUT
INPUT CODING
STRAIGHT BINARY
UNIPOLAR SCALE
370
21
12
LOAD
(444 NOMINAL)
(FOR 0 TO ±0.5V FS)
OFFSET
ADJUST
20
BIT 12
22
23
1μF
Figure 3. Bipolar Current Output Connections
ANALOG OUTPUT
BIPOLAR
SCALE
INPUT CODING
OFFSET BINARY
±0.5V F.S.
±2.5V F.S.
±5V F.S.
–F.S. + 1LSB
1111 1111 1111
+0.4998V
–2.4988V
–4.9976V
–9.9951V
–1/2F.S.
1100 0000 0000
+0.1250V
–1.2500V
–2.5000V
–5.0000V
–1LSB
1000 0000 0001
+0.0002V
–0.0012V
–0.0024V
–0.0049V
0
1000 0000 0000
0.0000V
0.0000V
0.0000V
0.0000V
+1/2F.S.
0100 0000 0000
–0.1250V
+1.2500V
+2.5000V
+5.0000V
±10V F.S.
+F.S. – 1LSB
0000 0000 0001
–0.4998V
+2.4988V
+4.9976V
+9.9951V
+F.S.
0000 0000 0000
–0.5000V
+2.5000V
+5.0000V
+10.0000V
Table 3. Programmable Output Range Pin Connections
OUTPUT VOLTAGE
RANGE
DATEL
•
FEEDBACK
CONNECTIONS
CONNECT THESE
PINS TOGETHER
PIN 17 to PIN 18 / PIN 20 to PIN 23
0 to –5V
PIN 19
0 to –10V
PIN 19
PIN 20 to PIN 23
±2.5V
PIN 19
PIN 17 to PIN 18 / PIN 20 to PIN 18
±5V
PIN 19
PIN 20 to PIN 18
±10V
PIN 17
PIN 20 to PIN 18
11 Cabot Boulevard, Mansfield, MA 02048-1151 USA
•
Tel: (508) 339-3000
•
www.datel.com
•
e-mail: [email protected]
MDA_DAC-HF.B05 Page 3 of 5
®
DAC-HF
®
2k
20
BIPOLAR
OFFSET
21
REF OUT
(–10V = 2%)
19
2k7FEEDBACK
(10V RANGE)
17
4k7FEEDBACK
(20V RANGE)
2k
2V/DIV
4k = 0.1%
2V/DIV
Ultra-Fast, 8/10/12-Bit Digital-to-Analog Converters
18 OUTPUT
5mA
4007±10%
50nsec/DIV
23 GROUND
DAC-HF with AM-500, ±5V output full scale (10V) step
Figure 5. Voltage Output Waveforms
Figure 4. Equivalent Output Circuit
7
7
7
OUTPUT
STEP
TYPICAL SETTLING
TIME TO 1LSB
OUTPUT
STEP
TYPICAL SETTLING
TIME TO 1LSB
20V
10V
5V
300ns
200ns
150ns
20V
10V
5V
2μs
600ns
400ns
Figure 6. Unipolar Ultra-Fast Voltage Output Circuit
DATEL
50nsec/DIV
•
11 Cabot Boulevard, Mansfield, MA 02048-1151 USA
Figure 7. Unipolar Fast Voltage Output Circuit
•
Tel: (508) 339-3000
•
www.datel.com
•
e-mail: [email protected]
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)
24
Dimension Tolerances (unless otherwise indicated):
2 place decimal (.XX) ±0.010 (±0.254)
3 place decimal (.XXX) ±0.005 (±0.127)
13
Lead Material: Kovar alloy
0.80 MAX.
(20.32)
1
Lead Finish: 50 microinches (minimum) gold plating
over 100 microinches (nominal) nickel plating
12
0.100 TYP.
(2.540)
1.100
(27.940)
0.235 MAX.
(5.969)
0.200 MAX.
(5.080)
+0.002
0.010 –0.001
(0.254)
0.190 MAX.
(4.826)
0.100
(2.540)
0.040
(1.016)
0.018 ±0.002
(0.457)
SEATING
PLANE
0.025
(0.635)
ORDERING INFORMATION
OPERATING
MODEL NUMBER
TEMP. RANGE
DAC-HF8BMC
0 TO +70°C
BITS
8
No
–40 TO +100°C
8
No
DAC-HF8BMM
–55 TO +125°C
8
No
DAC-HF8/883
–55 TO +125°C
8
No
DAC-HF10BMC
0 TO +70°C
10
No
DAC-HF10BMM
–55 TO +125°C
10
No
DAC-HF10BME
–40 TO +100°C
10
No
DAC-HF10/883
–55 TO +125°C
10
No
DAC-HF12BMC
0 TO +70°C
12
No
DAC-HF12BME
–40 TO +100°C
12
No
DAC-HF12BMM
–55 TO +125°C
12
No
DAC-HF12BMM-QL
–55 TO +125°C
12
No
DAC-HF12/883
–55 TO +125°C
12
No
DAC-HF8BMC-C
0 TO +70°C
8
Yes
DAC-HF8BME-C
–40 TO +100°C
8
Yes
DAC-HF8BMM-C
–55 TO +125°C
8
Yes
DAC-HF10BMC-C
0 TO +70°C
10
Yes
DAC-HF10BME-C
–40 TO +100°C
10
Yes
DAC-HF10BMM-C
–55 TO +125°C
10
Yes
DAC-HF12BMC-C
0 TO +70°C
12
Yes
DAC-HF12BME-C
–40 TO +100°C
12
Yes
DAC-HF12BMM-C
–55 TO +125°C
12
Yes
DAC-HF12BMM-QL-C
–55 TO +125°C
12
Yes
DAC-HF12-C/883
–55 TO +125°C
12
Yes
11 Cabot Boulevard, Mansfield, MA 02048-1151 USA
0.100
(2.540)
ROHS
DAC-HF8BME
DATEL
ITAR and ISO 9001/14001 REGISTERED
0.600 ±0.010
(15.240)
. 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: [email protected]
MDA_DAC-HF.B05 Page 5 of 5