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PDF DAC7541A Data sheet ( Hoja de datos )
| Número de pieza | DAC7541A | |
| Descripción | Low Cost 12-Bit CMOS Four-Quadrant Multiplying DIGITAL-TO-ANALOG CONVERTER | |
| Fabricantes | Burr-Brown Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de DAC7541A (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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® DAC7541A
Low Cost 12-Bit CMOS
Four-Quadrant Multiplying
DIGITAL-TO-ANALOG CONVERTER
FEATURES
q FULL FOUR-QUADRANT
MULTIPLICATION
q 12-BIT END-POINT LINEARITY
q DIFFERENTIAL LINEARITY ±1/2LSB MAX
OVER TEMPERATURE
q MONOTONICITY GUARANTEED OVER
TEMPERATURE
q TTL-/CMOS-COMPATIBLE
q SINGLE +5V TO +15V SUPPLY
q LATCH-UP RESISTANT
q 7521/7541/7541A REPLACEMENT
q PACKAGES: Plastic DIP, Plastic SOIC
q LOW COST
DESCRIPTION
The Burr-Brown DAC7541A is a low cost 12-bit,
four-quadrant multiplying digital-to-analog converter.
Laser-trimmed thin-film resistors on a monolithic
CMOS circuit provide true 12-bit integral and differ-
ential linearity over the full specified temperature
range.
DAC7541A is a direct, improved pin-for-pin replace-
ment for 7521, 7541, and 7541A industry standard
parts. In addition to a standard 18-pin plastic package,
the DAC7541A is also available in a surface-mount
plastic 18-pin SOIC.
VREF
10kΩ
10kΩ
10kΩ
20kΩ
20kΩ
20kΩ
10kΩ
20kΩ
20kΩ
20kΩ
SPDT NMOS
Switches
Bit 1
(MSB)
Bit 2
Bit 3
Bit 11
Bit 12
(LSB)
10kΩ
IOUT 2
IOUT 1
RFB
Digital Inputs (DTL-/TTL-/CMOS-compatible)
Logic: A switch is closed to IOUT 1 for its digital input in a “HIGH” state.
Switches shown for digital inputs “HIGH”.
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 • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
©1987 Burr-Brown Corporation
PDS-639C
Printed in U.S.A. September, 1993
1 page  
DISCUSSION
OF SPECIFICATIONS
RELATIVE ACCURACY
This term (also known as linearity) describes the transfer
function of analog output to digital input code. The linearity
error describes the deviation from a straight line between
zero and full scale.
DIFFERENTIAL NONLINEARITY
Differential nonlinearity is the deviation from an ideal 1LSB
change in the output, from one adjacent output state to the
next. A differential nonlinearity specification of ±1.0LSB
guarantees monotonicity.
GAIN ERROR
Gain error is the difference in measure of full-scale output
versus the ideal DAC output. The ideal output for the
DAC7541A is –(4095/4096) X (VREF). Gain error may be
adjusted to zero using external trims.
OUTPUT LEAKAGE CURRENT
The measure of current which appears at Out1 with the DAC
loaded with all zeros, or at Out2 with the DAC loaded with
all ones.
MULTIPLYING FEEDTHROUGH ERROR
This is the AC error output due to capacitive feedthrough
from VREF to Out1 with the DAC loaded with all zeros. This
test is performed at 10kHz.
OUTPUT CURRENT SETTLING TIME
This is the time required for the output to settle to a tolerance
of ±0.5LSB of final value from a change in code of all zeros
to all ones, or all ones to all zeros.
PROPAGATION DELAY
This is the measure of the delay of the internal circuitry and
is measured as the time from a digital code change to the
point at which the output reaches 90% of final value.
DIGITAL-TO-ANALOG GLITCH IMPULSE
This is the measure of the area of the glitch energy measured
in nV-seconds. Key contributions to glitch energy are digital
word-bit timing differences, internal circuitry timing differ-
ences, and charge injected from digital logic.
MONOTONICITY
Monotonicity assures that the analog output will increase or
stay the same for increasing digital input codes. The
DAC7541A is guaranteed monotonic to 12 bits.
POWER SUPPLY REJECTION
Power supply rejection is the measure of the sensitivity of
the output (full scale) to a change in the power supply
voltage.
CIRCUIT DESCRIPTION
The DAC7541A is a 12-bit multiplying D/A converter
consisting of a highly stable thin-film R-2R ladder network
and 12 pairs of current steering switches on a monolithic
chip. Most applications require the addition of a voltage or
current reference and an output operational amplifier.
A simplified circuit of the DAC7541A is shown in Figure 1.
The R-2R inverted ladder binarily divides the input currents
that are switched between IOUT 1 and IOUT 2 bus lines. This
switching allows a constant current to be maintained in each
ladder leg independent of the input code.
The input resistance at VREF (Figure 1) is always equal to
RLDR (RLDR is the R/2R ladder characteristic resistance and
is equal to value “R”). Since RIN at the VREF pin is constant,
the reference terminal can be driven by a reference voltage
or a reference current, AC or DC, of positive or negative
polarity.
VREF
10kΩ
10kΩ
10kΩ
20kΩ
20kΩ
20kΩ
20kΩ 20kΩ
S1 S2 S3
S12
Bit 1
(MSB)
Bit 2
Bit 3
Bit 12
(LSB)
IOUT 2
IOUT 1
RFB
Digital Inputs (DTL-/TTL-/CMOS-compatible)
Switches shown for digital inputs “HIGH”.
FIGURE 1. Simplified DAC Circuit.
EQUIVALENT CIRCUIT ANALYSIS
Figures 2 and 3 show the equivalent circuits for all digital
inputs low and high, respectively. The reference current is
switched to IOUT 2 when all inputs are low and IOUT 1 when
inputs are high. The IL current source is the combination of
surface and junction leakages to the substrate; the
1/4096 current source represents the constant one-bit current
drain through the ladder terminal.
DYNAMIC PERFORMANCE
Output Impedance
The output resistance, as in the case of the output capaci-
tance, is also modulated by the digital input code. The
resistance looking back into the IOUT 1 terminal may be
anywhere between 10kΩ (the feedback resistor alone when
all digital inputs are low) and 7.5kΩ (the feedback resistor
in parallel with approximately 30kΩ of the R-2R ladder
network resistance when any single bit logic is high). The
static accuracy and dynamic performance will be affected by
this modulation. The gain and phase stability of the output
®
5 DAC7541A
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet DAC7541A.PDF ] | |
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