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PDF ( 数据手册 , 数据表 ) DAC7541A

零件编号 DAC7541A
描述 Low Cost 12-Bit CMOS Four-Quadrant Multiplying DIGITAL-TO-ANALOG CONVERTER
制造商 Burr-Brown Corporation
LOGO Burr-Brown Corporation LOGO 


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DAC7541A 数据手册, 描述, 功能
® 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
10k
10k
10k
20k
20k
20k
10k
20k
20k
20k
SPDT NMOS
Switches
Bit 1
(MSB)
Bit 2
Bit 3
Bit 11
Bit 12
(LSB)
10k
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







DAC7541A pdf, 数据表
DIGITALLY CONTROLLED GAIN BLOCK
The DAC7541A may be used in a digitally controlled gain
block as shown in Figure 7. This circuit gives a range of gain
from one (all bits = one) to 4096 (LSB = one). The transfer
function is:
( )VOUT =
–VIN
B1 + B2 + B3 + • • • + B12
248
4096
All bits off is an illegal state, as division by zero is impos-
sible (no op amp feedback). Also, errors increase as gain
increases, and errors are minimized at major carries (only
one bit on at a time).
Bits 1 to 12
VIN 18
16 VDD
DAC7541A
1
2
17
3
OPA604
VOUT
FIGURE 7. Digitally Programmable Gain Block.
®
DAC7541A
8














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