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DAC709KH Schematic ( PDF Datasheet ) - Burr-Brown Corporation

Teilenummer DAC709KH
Beschreibung Microprocessor-Compatible 16-BIT DIGITAL-TO-ANALOG CONVERTERS
Hersteller Burr-Brown Corporation
Logo Burr-Brown Corporation Logo 




Gesamt 11 Seiten
DAC709KH Datasheet, Funktion
DAC707
® DAC708
DAC709
Microprocessor-Compatible
16-BIT DIGITAL-TO-ANALOG CONVERTERS
FEATURES
q TWO-CHIP CONSTRUCTION
q HIGH-SPEED 16-BIT PARALLEL, 8-BIT
(BYTE) PARALLEL, AND SERIAL INPUT
MODES
q DOUBLE-BUFFERED INPUT REGISTER
CONFIGURATION
q VOUT AND IOUT MODELS
DESCRIPTION
The DAC708 and DAC709 are 16-bit converters de-
signed to interface to an 8-bit microprocessor bus. 16-
bit data is loaded in two successive 8-bit bytes into
parallel 8-bit latches before being transferred into the
D/A latch. The DAC708 and DAC709 are current and
voltage output models respectively and are in 24-pin
hermetic DIPs. Input coding is Binary Two’s Comple-
ment (bipolar) or Unipolar Straight Binary (unipolar,
when an external logic inverter is used to invert the
MSB). In addition, the DAC708/709 can be loaded
serially (MSB first).
The DAC707 is designed to interface to a 16-bit bus.
q HIGH ACCURACY:
Linearity Error ±0.003% of FSR max
Differential Linearity Error ±0.006% of FSR
max
q MONOTONIC (TO 14 BITS) OVER
SPECIFIED TEMPERATURE RANGE
q HERMETICALLY SEALED
q LOW COST PLASTIC VERSIONS
AVAILABLE (DAC707JP/KP)
Data is written into a 16-bit latch and subsequently the
D/A latch. The DAC707 has bipolar voltage output
and input coding is Binary Two’s Complement (BTC).
All models have Write and Clear control lines as well
as input latch enable lines. In addition, DAC708 and
DAC709 have Chip Select control lines. In the bipolar
mode, the Clear input sets the D/A latch to give zero
voltage or current output. They are all 14-bit accurate
and are complete with reference, and for the DAC707,
and DAC709, a voltage output amplifier. All models
are available with an optional burn-in screening.
8-Bit
(DAC708, 709)
or
16-Bit (DAC707)
Serial
(DAC708, 709)
Serial
Data
High
Byte
Latch
Low
Byte
Latch
D/A
Latch
16-Bit
D/A
Con-
verter
Reference
Circuit
Bipolar
Offset
Summing Junction (708, 709)
10V Range (708, 709)
VOUT
Latch Enables/
Mode Select
CLEAR
WRITE
CHIP SELECT
Control
Logic
DAC707 or DAC709
Only
DAC707/708/709 Block Diagram
International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111 • Twx: 910-952-1111
Internet: http://www.burr-brown.com/ • FAXLine: (800) 548-6133 (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
PDS-557H






DAC709KH Datasheet, Funktion
DISCUSSION OF
SPECIFICATIONS
DIGITAL INPUT CODES
For bipolar operation, the DAC707/708/709 accept positive-
true binary two’s complement input code. For unipolar
operation (DAC708/709 only) the input code is positive-true
straight-binary provided that the MSB input is inverted with
an external inverter. See Table I.
ANALOG OUTPUT
Digital
Input
Codes
Unipolar Straight Binary(1)
(DAC708/709 only; connected
for Unipolar operation)
Binary Two's Complement
(Bipolar operation;
all models)
7FFFH
0000H
FFFFH
8000H
+1/2 Full Scale –1LSB(2)
Zero
+Full Scale
+1/2 Full Scale
+Full Scale
Zero
–1LSB
–Full Scale
NOTES: (1) MSB must be inverted externally. (2) Assumes MSB is inverted
externally.
TABLE I. Digital Input Codes.
ACCURACY
Linearity
This specification describes one of the most important mea-
sures of performance of a D/A converter. Linearity error is
the deviation of the analog output from a straight line drawn
through the end points (–Full Scale point and +Full Scale
point).
Differential Linearity Error
Differential Linearity Error (DLE) of a D/A converter is the
deviation from an ideal 1LSB change in the output when the
input changes from one adjacent code to the next. A differ-
ential linearity error specification of ±1/2LSB means that the
output step size can be between 1/2LSB and 3/2LSB when
the input changes between adjacent codes. A negative DLE
specification of –1LSB maximum (–0.006% for 14-bit reso-
lution) insures monotonicity.
Monotonicity
Monotonicity assures that the analog output will increase or
remain the same for increasing input digital codes. The
DAC707/708/709 are specified to be monotonic to 14 bits
over the entire specification temperature range.
DRIFT
Gain Drift
Gain Drift is a measure of the change in the full-scale range
output over temperature expressed in parts per million per
degree centigrade (ppm/°C). Gain drift is established by: (1)
testing the end point differences at tMIN, +25°C and tMAX; (2)
calculating the gain error with respect to the +25°C value;
and (3) dividing by the temperature change.
Zero Drift
Zero Drift is a measure of the change in the output with
0000H applied to the D/A converter inputs over the specified
temperature range. (For the DAC708/709 in unipolar mode,
the MSB must be inverted). This code corresponds to zero
volts (DAC707 and DAC709) or zero milliamps (DAC708)
at the analog output. The maximum change in offset at tMIN
or tMAX is referenced to the zero error at +25°C and is divided
by the temperature change. This drift is expressed in FSR/
°C.
SETTLING TIME
Settling time of the D/A is the total time required for the
analog output to settle within an error band around its final
value after a change in digital input. Refer to Figure 1 for
typical values for this family of products.
1
DAC708
DAC707
DAC709
0.1
0.01
RL = 100
RL = 1k
0.001
0.01
0.1 1
Settling Time (µs)
10
FIGURE 1. Final-Value Error Band Versus Full-Scale Range
Settling Time.
Voltage Output
Settling times are specified to ±0.003% of FSR (±1/2LSB
for 14 bits) for two input conditions: a full-scale range
change of 20V (±10V) or 10V (±5V or 0 to 10V) and a 1LSB
change at the “major carry”, the point at which the worst-
case settling time occurs. (This is the worst-case point since
all of the input bits change when going from one code to the
next.)
Current Output
Settling times are specified to ±0.003% of FSR for a full-
scale range change for two output load conditions: one for
10to 100and one for 1000. It is specified this way
because the output RC time constant becomes the dominant
factor in determining settling time for large resistive loads.
COMPLIANCE VOLTAGE
Compliance voltage applies only to current output models. It
is the maximum voltage swing allowed on the output current
pin while still being able to maintain specified accuracy.
POWER SUPPLY SENSITIVITY
Power supply sensitivity is a measure of the effect of a
change in a power supply voltage on the D/A converter
®
DAC707/708/709
6

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