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PDF DAC8841 Data sheet ( Hoja de datos )
| Número de pieza | DAC8841 | |
| Descripción | CMOS TrimDAC | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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1. DAC8841  Hay una vista previa y un enlace de descarga de DAC8841 (archivo pdf) en la parte inferior de esta página. Total 11 Páginas | ||
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ANALOG
DEVICES
8-Bit Octal, 2-Quadrant
Multiplying, CMOS TrimDAC
FEATURES
Replaces 8 Potentiometers
Operates From Single +5 V Supply
1 MHz 2-Quadrant Muitipiying Bandwidth
No Signal Inversion
Eight Individual Channels
3-Wire Serial Input
500 kHz Update Data Loading Rate
+3 Volt Output Swing
Midscale Preset
Low 95 mW Power Dissipation
APPLICATIONS
Trimmer Replacement
Dynamic Level Adjustment
Special Waveform Generation and Modulation
Programmable Gain Amplifiers
GENERAL DESCRIPTION
The DAC-8841 provides eight general purpose digitally controDed
voltage adjustment devices. The TrimDAC™ capability replaces
the mechanical trimmer function in new designs. It is ideal for
ac or dc gain control of up to 1 MHz bandwidth signals.
Internally the DAC-8841 contains eight voltage output CMOS
digital-to-analog converters, each wi± separate reference inputs.
Each DAC has its own DAC register which holds its output
state. These DAC registers are updated from an internal serial-
to-parallel shift register which is loaded from a standard 3-wire
serial input digital interface. Twelve data bits make up the data
word clocked into the serial input register. This data word is
decoded where the first 4 bits determine the address of the DAC
register to be loaded with the last 8 bits of data. A serial data
output pin at the opposite end of the serial register allows sim
ple daisy-chaining in multiple DAC applications without addi
tional external decoding logic.
TrimDAC is a trademark of Analog Devices, Inc.
DAC-8841 FUNCTIONAL BLOCK DIAGRAM
LOAD i
QND SDO PRESET V^gpL
The DAC-8841 consumes only 95 mW froir a -1-5 V power sup
ply. For dual polarity applications see the DAC-8840 which pro
vides full 4-quadrant-multiplying ±3 V signal capability while
operating from ±5 V power supplies.
The DAC-8841 is available in 24-pin plastic DIP, cerdip, and
SOIC-24 packages. For MIL-STD/883 applications, contact
ADI sales for the DAC-8841BW/883 data sheet which specifies
operation over -55®C to 4-125°C.
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use; nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
Twx: 710/394-6577
Telex: 924491
Cable: ANALOG NORWOODMASS
1 page  
D1 1 1MSB A3LSBDO
D2
D3 D4
D5
D6 MSBD7 LSBAO AI
A2
MSB
D7 D6 D5 D4 D3 I D2 I D1
0
MSB
A3
0
0
0
0
0
0
0
0
1
1
1
A2 Al
00
00
01
01
10
10
11
11
00
00
1 *1
LSB
AO
0
1
1
1
1
1
1
DAC Updated
No Operation
DAC A
DACB
DACC
DACD
DACE
DACF
DACG
DACH
No Operation
No Operation
DAC Output Voltage
VOUT = D/I28 (YIN - VREFL) + VREFL
VREFL
1/128 {YIN - YREFL) + VREFL
127/128 (YIN - YREFL) + YREFL
YIN (Preset Value)
129/128 (YIN - YREFL) + YREFL
254/128 (YIN - YREFL) + VREFL
255/128 (YIN - YREFL) + YREFL
Table I. Serial Input Decode Table
SDI CLK LD PR Input Shift Register Operation
XL
X^
XX
XL
L H No Operation
L H Shift One Bit In from SDI (Pin 20),
Shift One Bit* Out from SDO (Pin 18)
L L All DAC Registers = 80^
H H Load Serial Register Data into
DAC(X) Register
*Datashifted into the SDI pin appears twelve clocks later at the SDO pin.
Table II: Logic Control Input Truth Table
5 Page 
iiiliiS®®iffiiMii
24-Pin Wide-Body SOIC Package
nnnnnnRRRRnn
0,2992 (7.60)
02914 (7.40)
yyyyyyyyyyyy
0.6141 (15.60)
02985 (1520)
0.4193 (10.65)
02937 (10.00)
O.OSCO (1.27)
0.0157 (0.40)
0.0291 (0.74)
0.0096 (025)
T
0.1043 (^65)
I 0.0926 (2.35)
fp
O'-S*
HK
0.0500 BSC
(127) BSC
H
0.0192 (0.49)
0.0138(025)
SEATING.
PLANE
0.0118 (0.30)
0.0040 (0.10)
0.0125 (0.32)
0.0091 (0.23)
%^
SEE
DETAIL
- ABOVE
0.005 (0.13)
MIN
24-Pin Narrow-Body Cerdip Package
n n n n n n n n n jncuiL
—H h~ 0.098(2.49)
MAX
r 24
ISA
0.060 (122)
0.015 (028)
0200 (S.08) I I
0.125 (3.18)
LiUUUUiil'UUUULJ'
1.280 (3221)
MAX
n
0200 (5.08)
MAX
0.150
(3.81)
MIN
0.310 (7.87)
n 99n m !;m
0.320 (8.13)
0.290 (7.37)
0.023 (0.58)
0.014(0.36)
0.100 (2.54) BSC
0.070 (1.78)
0.030 (0.76)
SEATING
PLANE
0*-15
-11-
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet DAC8841.PDF ] | |
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