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PDF ( 数据手册 , 数据表 ) DAC4813

零件编号 DAC4813
描述 QUAD 12-BIT DIGITAL-TO-ANALOG CONVERTER 12-bit port interface
制造商 Burr-Brown Corporation
LOGO Burr-Brown Corporation LOGO 


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DAC4813 数据手册, 描述, 功能
® DAC4813
DAC4813
QUAD 12-BIT DIGITAL-TO-ANALOG
CONVERTER (12-bit port interface)
FEATURES
q COMPLETE WITH REFERENCE AND
OUTPUT AMPLIFIERS
q 12-BIT PORT INTERFACE
q ANALOG OUTPUT RANGE: ±10V
q MONOTONICITY GUARANTEED OVER
TEMPERATURE
q INTEGRAL LINEARITY
ERROR: ±1/2LSB max
q ±12V to ±15V SUPPLIES
q 28-PIN PLASTIC DIP PACKAGE
DAC4813
10V
Reference
D/A 1
VREF OUT
VOUT 1
DESCRIPTION
DAC4813 is a complete quad 12-bit digital-to-analog
converter with bus interface logic. Each package in-
cludes a precision +10V voltage reference, double-
buffered bus interface including a RESET function
and 12-bit D/A converters with voltage-output opera-
tional amplifiers.
The double-buffered interface consists of a 12-bit
input latch and a D/A latch for each D/A converter. A
RESET control allows the D/A outputs to be asyn-
chronously reset to bipolar zero, a feature useful for
power-up reset, system initialization and recalibration.
DAC4813 D/A converters are committed to the ±10V
output range only. Gain and offset are not externally
adjustable.
DAC4813 is available with a integral linearity error of
1/2LSB and 12-bit monotonicity guaranteed over tem-
perature. It is packaged in a 28-pin 0.6in. wide plastic
DIP package and specified over –40oC to +85oC and
0°C to +70°C.
DB0 LSB
12
DB11
MSB
D/A 2
12-bit
Latches
D/A 3
VOUT 2
VOUT 3
D/A 4
VOUT 4
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
© 1992 Burr-Brown Corporation
PDS-11148C
DAPCrint4ed8in1U3.S.A. May, 1997
®







DAC4813 pdf, 数据表
RESET FUNCTION
The Reset function resets only the D/A latch. Therefore,
after a RESET, good data must be written to all the input
latches before an LDAC – WR command is issued. Other-
wise, old data or unknown data is present in the input latches
and will be transferred to the D/A latch producing an analog
output value that may be unwanted.
LOGIC INPUT COMPATIBILITY
DAC4813 digital inputs are TTL compatible (1.4V switch-
ing level) over the operating range of +VCC. Each input has
low leakage and high input impedance. Thus the inputs are
suitable for being driven by any type of 5V logic. An
equivalent circuit of a digital input is shown in Figure 1.
Open DATA input lines will float to 7V or more. Although
this will not harm the DAC4813, current spikes will occur in
the input lines when a logic 0 is asserted and, in addition, the
speed of the interface will be slower. A digital output driving
a DATA input line of the DAC4813 must not drive, or let
the DATA input float, above +5.5V. Unused DATA inputs
should be connected to DCOM.
Unused control inputs should be connected to a voltage
greater than +2V but not greater than +5.5V. If this voltage
is not available, the control inputs can be connected to +V
CC
through a 100kresistor to limit the input current.
Digital
Input
R
6.8V
DCOM
10
to
20pF
II
DIGITAL INPUT
Data, LDAC, WR, RESET
ENX
DAC4813
R
250
330
FIGURE 1. Equivalent Digital Input Circuit.
INPUT CODING
DAC4813 accepts positive-true binary input codes.
Input coding for bipolar analog outputs is Bipolar Offset
Binary (BOB), where an input code of 000HEX gives a minus
full-scale output, an input of FFFHEX gives an output 1LSB
below positive full scale, and zero occurs for an input code
of 800HEX.
DAC4813 can be used with two's complement coding if a
logic inverter is used ahead of the MSB input (DB11).
INTERNAL/EXTERNAL REFERENCE USE
DAC4813 contains a +10V ±50mV voltage reference,
VREF OUT. VREF OUT is available to drive external loads sourcing
up to 2mA. The load current should be constant, otherwise
the gain (and bipolar offset, if connected) of the D/A
converters will vary.
Because of the lack of additional pins required for external
reference inputs, VREF OUT is connected internally to all 4
D/A converters. V
is available for external use on pin
REF OUT
28.
GAIN AND OFFSET ADJUSTMENTS
DAC4813 has no Gain and Offset Adjustment option.
INSTALLATION
POWER SUPPLY CONNECTIONS
Power supply decoupling capacitors should be added. Best
settling time performance occurs using a 1 to 10µF tantalum
capacitor at –VCC. Applications with less critical settling
time may be ale to use 0.01µF at
–V as well as at +V .
CC CC
The capacitors should be located close to the package.
DAC4813 features separate digital and analog power supply
returns to permit optimum connections for low noise and
high speed performance. It is recommended that both DIGI-
TAL COMMON (DCOM) and ANALOG COMMON
(ACOM) be connected directly to a ground plane under the
package. If a ground place is not used, connect the ACOM
and DCOM pins together close to the package. Since the
reference point for VOUT and VREF OUT is the ACOM pin, it is
also important to connect the load directly to the ACOM pin.
The change in current in the ACOM pin due to an input date
word change from 000HEX to FFFHEX is only 1mA for each
D/A converter.
OUTPUT VOLTAGE SWING
AND RANGE CONNECTIONS
DAC4813 output amplifiers provide a ±10V output swing
while operating on supplies as low as ±12V ±5%.
DAC4813 is fully committed to ±10V output ranges. Op-
tional ranges are not pin programmable.
12- AND 16-BIT BUS INTERFACES
DAC4813 data is latched into the input latches of each D/A
by asserting low each ENx individually and transferring the
data from the bus to each input latch by asserting WR low.
All D/A outputs in each package are then updated simulta-
neously by asserting LDAC and WR low.
Be sure to read the CAUTION statement in the LOGIC
INPUT COMPATIBILITY section.
®
DAC4813
8














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