BB DAC56

DA
C56
®
49%
FPO
DA
DAC56
C5
6
Monolithic 16-Bit Resolution
DIGITAL-TO-ANALOG CONVERTER
FEATURES
APPLICATIONS
● COMPLETE D/A CONVERTER:
Internal Voltage Reference
±3V Output Operational Amplifier
Pinout Allows IOUT (±1.0mA) Option
No external components required
● PROCESS CONTROL
● ATE PIN ELECTRONICS LEVEL SETTING
● CLOSED-LOOP SERVO-CONTROL
● AUTO-CALIBRATION CIRCUIT FOR A/D
BOARDS
● 0.012% LINEARITY ERROR MAX
● UP-GRADE REPLACEMENT FOR
MULTIPLYING D/A
● 12-BIT MONOTONICITY GUARANTEED
OVER 0°C TO +70°C
● X-Y PLOTTER
● ±5V TO ±12V POWER SUPPLY
● DSP PROCESSOR BOARDS
● SETTLING TIME: VOUT = 1.5µs;
IOUT = 350ns
● SERIAL DATA INPUT: Binary Two’s
Complement
● 16-PIN PLASTIC DIP AND SOIC
DESCRIPTION
A high-speed interface is capable of clocking in data
at a rate of 10MHz max, and its interface logic contains a serial data clock (input), serial data (input) and
latch-enable (input). Serial data is clocked MSB first
into a 16-bit register and then latched into a 16-bit
parallel register.
The DAC56 is a complete 16-bit monolithic D/A
converter. Completely self-contained with a stable,
low noise, internal zener voltage reference; high-speed
current switches; a resistor ladder network; and a low
noise output operational amplifier all on a single
monolithic chip. The DAC56 operates over a wide
power supply range from ±5V to ±12V.
The DAC56 is packaged in a 16-pin plastic DIP and
16-pin SOIC.
Differential linearity error (DLE) is guaranteed to
meet specifications without external adjustment. However, provisions for an externally adjustable circuit
controlling the MSB error, the differential linearity
error at bipolar zero, makes the DLE at BPZ essentially zero and provides for high system performance.
The I/V amplifier stage includes an output current
limiting circuit to protect both amplifier and load from
excessive current. This assures the user of high system
reliability.
RF
Reference
16-Bit
IOUT DAC
Output
16-Bit Input Latch
16-Bit Serial-to-Parallel Conversion
Clock LE Data
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-1231A
1
DAC56
SPECIFICATIONS
ELECTRICAL
All specifications at +25°C, and power supply voltage of ±5V, unless otherwise noted.
DAC56
PARAMETER
CONDITIONS
DIGITAL INPUT
Resolution
Digital Input Level: (1) VIH
VIL
IIH • VI = +2.7V
IIL • VI = +0.4V
Input Clock Frequency
ACCURACY
Integral Linearity Error
Differential Linearity Error
Gain Error
Bipolar Zero Error
Monotonicity
TEMPERATURE DRIFT
Gain Drift
Bipolar Zero Drift
Linearity Drift
Differential Linearity Drift
MIN
TYP
MAX
UNITS
+VL
+0.8
+1
–50
Bits
V
V
µA
µA
MHz
±0.012
±0.024
±1.5
±0.5
12
% of FSR(3)
% of FSR
% of FSR
% of FSR
Bits
±0.012
±0.024
ppm of FSR/°C
ppm of FSR/°C
% of FSR
% of FSR
16
+2.4
0
10
0°C to +70°C
0°C to +70°C
±60
±20
POWER SUPPLY SENSITIVITY
Gain
Bipolar Zero
±VS = ±VL = ±5VDC
SETTLING TIME
Voltage Output
6V Step
1LSB
Current Output
1mA Step
to ±0.006% of FSR
10 to 100Ω Load
1kΩ Load(3)
Slew Rate
ANALOG OUTPUT
Voltage Output Configuration
Bipolar Range
Output Current
Output Impedance
Short Circuit Duration
Current Output Configuration
Bipolar Range
Output Impedance
±2.66
±8
±0.0045
±0.0015
% of FSR/%V
% of FSR/%V
1.5
1
µs
µs
350
350
ns
ns
12
V/µs
±3.0
±3.34
0.1
Indefinite to Common
±1
1.2
WARMUP TIME
mA
kΩ
1
POWER SUPPLY REQUIREMENTS(4)
Supply Voltage
+VS and +VL
–VS and –VL
Supply Drain (No Load)
+V (+VS and +VL = +5V)
–V (–VS and –VL = –5V)
+V (+VS and +VL = +12V)
–V (–VS and –VL = –12V)
Power Dissipation
VS and VL = ±5V
VS and VL = ±12V
+4.75
–4.75
TEMPERATURE RANGE
Specification
Storage
0
–60
V
mA
Ω
min
+5.00
–5.00
+13.2
–13.2
V
V
+10
–25
+12
–27
+17
–35
mA
mA
mA
mA
175
468
260
mW
mW
70
100
°C
°C
NOTES: (1) Logic input levels are TTL-/CMOS-compatible. (2) FSR means full-scale range and is equivalent to 6V (±3V) for DAC56 in the VOUT mode. (3) Measured
with an active clamp to provide a low impedance for approximately 200ns. (4) All specifications assume +VS connected to +VL and –VS connected to –VL. If supplies
are connected separately, –VL must not be more negative than –VS to assure proper operation. No similar restriction applies to the value of +VL with respect to +VS.
®
DAC56
2
PIN CONFIGURATION
–5V
–VS
LCOM
1µF
1
16
16-Bit
DAC Latch
1µF
15 TRIM
2
+VL
+5V
3
1µF
NC
4
CLK
5
LE
6
Data
7
–VL
–5V
+5V
+VS
16-Bit Serial
to Parallel
Conversion
16-Bit
IOUT
DAC
14 MSB ADJ
13
12
Control
Logic and
Level
Shifting
Circuit
11
10
IOUT
ACOM
SJ
RF
Analog
Output
9
8
VOUT
(±3.0V)
1µF
NOTES:
= Analog Common
= Logic Common
ABSOLUTE MAXIMUM RATINGS
PIN ASSIGNMENTS
PIN
NAME
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
–VS
LCOM
+VL
NC
CLK
LE
DATA
–VL
VOUT
RF
SJ
ACOM
IOUT
MSB ADJ
TRIM
+VS
DC Supply Voltage ....................................................................... ±15VDC
Input Logic Voltage ........................................................... –1V to +V S/+VL
Power Dissipation .......................................................................... 850mW
Operating Temperature ................................................... –25°C to +70°C
Storage Temperature ..................................................... –80°C to +100°C
Lead Temperature (soldering, 10s) ............................................... +300°C
FUNCTION
Analog Negative Supply
Logic Common
Logic Positive Supply
No Connection
Clock Input
Latch Enable Input
Serial Data Input
Logic Negative Supply
Voltage Output
Feedback Resistor
Summing Junction
Analog Common
Current Output
MSB Adjustment Terminal
MSB Trim-pot Terminal
Analog Positive Supply
ELECTROSTATIC
DISCHARGE SENSITIVITY
Electrostatic discharge can cause damage ranging from performance degradation to complete device failure. BurrBrown Corporation recommends that all integrated circuits
be handled and stored using appropriate ESD protection
methods.
PACKAGE INFORMATION
PRODUCT
DAC56P
DAC56U
PACKAGE
PACKAGE DRAWING
NUMBER(1)
16-Pin Plastic DIP
16-Pin SOIC
180
211
NOTE: (1) For detailed drawing and dimension table, please see end of data
sheet, or Appendix C of Burr-Brown IC Data Book.
The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes
no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject to change
without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant
any BURR-BROWN product for use in life support devices and/or systems.
®
3
DAC56
OPERATING INSTRUCTIONS
POWER SUPPLY CONNECTIONS
Power supply decoupling capacitors should be added as
shown in the Connection Diagram (Figure 2), for optimum
performance and noise rejection.
These capacitors (1µF tantalum recommended) should be
connected as close as possible to the converter.
The accuracy of a D/A converter is described by the transfer
function as shown in Figure 1. Digital input to analog output
converter relationships are shown in Table I. The errors in
the D/A converter are combinations of analog errors due to
the linear circuitry, matching and tracking properties of the
ladder and scaling networks, power supply rejection, and
reference errors. In summary, these errors consist of initial
errors including gain, offset, linearity, differential linearity,
and power supply sensitivity. Gain drift over temperature
rotates the line (Figure 1) about the bipolar zero point and
offset drift shifts the line left or right over the operating
temperature range. Most of the offset and gain drift is due to
the drift of the internal reference zener diode with temperature or time.
–5V
1µF
–VS
LCOM
16
1
1µF
15 TRIM
2
+VL
+5V
3
1µF
The converter is designed so that these drifts are in opposite
directions. This way the bipolar zero voltage is virtually
unaffected by variations in the reference voltage.
NC
4
CLK
5
LE
6
Data
7
–VL
–5V
16-Bit Serial
to Parallel
Conversion
16-Bit
IOUT
DAC
Gain
Drift
14 MSB ADJ
13
12
Control
Logic and
Level
Shifting
Circuit
11
10
IOUT
ACOM
SJ
RF
Analog
Output
9
8
VOUT
(±3.0V)
1µF
(+FSR/2) –1LSB
+5V
+VS
16-Bit
DAC Latch
NOTES:
All Bits
On
= Analog Common
Analog Input
= Logic Common
FIGURE 2. Connection Diagram.
Offset
Drift
Bipolar
Zero
MSB ERROR ADJUSTMENT (OPTIONAL)
Differential linearity error at all codes of the DAC56 is
guaranteed to meet specifications without an external adjustment. However, if adjustment of the differential linearity
error at bipolar zero is desired, it can be trimmed essentially
to zero using the circuit as shown in Figure 3.
–FSR/2
0111...1111
Digital Output
1000...0000
* See Table I for digital code definitions.
FIGURE 1. Input vs Output for an Ideal Bipolar D/A
Converter.
DIGITAL INPUT
470kΩ
ANALOG OUTPUT
Binary Two’s
Complement (BTC)
DAC Output
Voltage (V),
VOUT Mode
Current (mA),
IOUT Mode
7FFFH
8000H
0000H
FFFFH
+ Full Scale
– Full Scale
Bipolar Zero
Zero –1LSB
+2.999908
–3.000000
0.000000
–0.000092
–0.999970
+1.000000
0.000000
+0.030500µA
200kΩ
1 –VS
MSB Adjust 14
NOTE: (1) 10-15 turns.
FIGURE 3. MSB Adjustment Circuit.
After allowing ample warm-up time (5 to 10 minutes) to
assure stable operation, select the input code FFFFH. Measure the output voltage using a 6-1/2 digit voltmeter and
record the measurement. Change the digital input code to
0000H. Adjust the 100kΩ potentiometer (TCR of 100ppm
per °C or less is recommended) to make the output voltage
read 1LSB more than the voltage reading of the previous
code (ex. 1LSB = 92µV at FSR = 6V).
TABLE I. Digital Input to Analog Output Relationship.
DIGITAL INPUT CODES
The DAC56 accepts serial input data (MSB first) in Binary
Two’s Complement form—Refer to Table I for input/output
relationships.
If the MSB adjustment circuit is not used, pins 14 and 15
should be left open.
®
DAC56
100kΩ(1)
Trim 15
4
(1)
CLK
LSB
MSB
DATA
1
(2)
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
1
2
MSB
LE
(3)
(4)
NOTES: (1) If clock is stopped between input of 16-bit data words, latch enable (LE) must remain low until after the first clock of the next 16-bit data
word stream. (2) Data format is binary two's complement (BTC). Individual data bits are clocked in on the corresponding positive clock edge. (3) Latch
enable (LE) must remain low at least one clock cycle after going negative. (4) Latch enable (LE) must be high for at least one clock cycle before going
negative.
FIGURE 4. Input Timing Diagram.
INPUT TIMING CONSIDERATIONS
Figures 4 and 5 refer to the input timing required to interface
the inputs of DAC56 to a serial input data stream. Serial data
is accepted in Binary Two’s Complement with the MSB being
loaded first. Data is clocked in on positive going clock (CLK,
pin 5) edges and is latched into the DAC input register on
negative going latch enable (LE, pin 6) edges.
The latch enable input must be high for at least one clock cycle
before going low, and then must be held low for at least one
clock cycle. The last 16 data bits clocked into the serial input
register are those that are transferred to the DAC input register
when latch enable goes low. In other words, when more than
16 clock cycles occur between a latch enable, only the data
present during the last 16 clocks will be transferred to the
DAC input register.
Figure 4 gives the general input format required for the
DAC56. Figure 5 shows the specific relationships between the
various signals and their timing constraints.
> 40ns
DATA
LSB
MSB
>15ns >15ns
CLK
> 40ns
> 40ns
> 100ns
> 5ns
> 15ns
LE
> One Clock Cycle
> One Clock Cycle
FIGURE 5. Input Timing Relationships.
®
5
DAC56