FUNCTIONAL SPECIFICATIONS

(Typical at +25°C and ±15V supplies unless otherwise noted.)

ABSOLUTE MAXIMUM RATINGS

PARAMETERS

LIMITS

UNITS

Positive Supply, Pin 24

+18

Volts

Negative Supply, Pin 22

–18

Volts

Digital Input Voltage, Pins 1–12

+15

Volts

Lead Temperature (soldering, 10s)

300

Volts

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

PERFORMANCE

Nonlinearity Error, max.

±0.012%

TMIN to TMAX

±0.024%

Differential Nonlinearity Error, max.

±0.012%

TMIN to TMAX

±0.024%

Monotonicity

Guaranteed over oper. temp. range

Gain Tempco, max.

±20ppm/°C

Offset Tempco, Bipolar, max.

±10ppm/°C of FSR

➁

Zero Tempco, max.

±1.5ppm/°C of FSR

➁

Settling Time, ns max.

➂

25

25

50

Power Supply Sensitivity

±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

to –10V

±2.5V

±5V ±10V

400 Ohms

Output Resistance

±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

–65°C to +150°C

Package Type

24-pin ceramic DDIP

Weight

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.

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.

DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: help@datel.com

DAC-HF

Ultra-Fast, 8/10/12-Bit Digital-to-Analog Converters

MDA_DAC-HF.B05 Page 2 of 5