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PDF MAX551 Data sheet ( Hoja de datos )
| Número de pieza | MAX551 | |
| Descripción | +3V/+5V / 12-Bit / Serial / Multiplying DACs in 10-Pin MAX Package | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-1260; Rev 0; 10/97
+3V/+5V, 12-Bit, Serial, Multiplying DACs
in 10-Pin µMAX Package
_______________General Description
The MAX551/MAX552 are 12-bit, current-output, 4-quad-
rant multiplying digital-to-analog converters (DACs).
These devices are capable of providing unipolar or
bipolar outputs when operating from either a single +5V
(MAX551) or +3V (MAX552) power supply. An internal
power-on-reset circuit clears all DAC registers on
power-up, setting the DAC output voltage to 0V.
The SPI™/QSPI™ and Microwire™-compatible 3-wire
serial interface saves board space and reduces power
dissipation compared with parallel-interface devices.
The MAX551/MAX552 feature double-buffered interface
logic with a 12-bit input register and a 12-bit DAC regis-
ter. Data in the DAC register sets the DAC output volt-
age. Data is loaded into the input register via the serial
interface. The LOAD input transfers data from the input
register to the DAC register, updating the DAC output
voltage.
The MAX551/MAX552 are available in an 8-pin DIP
package or a space-saving 10-pin µMAX package. The
µMAX package provides an asynchronous clear (CLR)
input that clears all DAC registers when pulled to GND,
setting the output voltage to 0V.
________________________Applications
Automatic Calibration
Gain Adjustment
Transducer Drivers
Process-Control I/O Boards
Digitally Controlled Filters
Motion-Controlled Systems
µP-Controlled Systems
Programmable Amplifiers/Attenuators
________________Functional Diagram
____________________________Features
o Single-Supply Operation:
+4.5V to +5.25V (MAX551)
+2.7V to +3.6V (MAX552)
o 12.5MHz 3-Wire Serial Interface
o SPI/QSPI and Microwire Compatible
o Power-On Reset Clears DAC Output to Zero
o Asynchronous Clear Input Clears DAC Output
to Zero
o Voltage Mode or Bipolar Mode Operation with
a Single Power Supply
o Schmitt-Trigger Digital Inputs for Direct
Optocoupler Interface
o 0.4µA Supply Current
o 10-Pin µMAX Package
______________Ordering Information
PART
TEMP. RANGE
PIN-
PACKAGE
LINEARITY
(LSB)
MAX551ACPA 0°C to +70°C 8 Plastic DIP ±1/2
MAX551BCPA 0°C to +70°C 8 Plastic DIP
±1
MAX551ACUB 0°C to +70°C 10 µMAX
±1/2
MAX551BCUB 0°C to +70°C 10 µMAX
±1
MAX551AEPA -40°C to +85°C 8 Plastic DIP ±1/2
MAX551BEPA
MAX551AEUB
MAX551BEUB
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
8 Plastic DIP
10 µMAX
10 µMAX
±1
±1/2
±1
Ordering Information continued at end of data sheet.
_________________Pin Configurations
REF
CLR*
LOAD
12-BIT
D/A CONVERTER
MAX551
MAX552
12-BIT
DAC REGISTER
12-BIT
SHIFT REGISTER
*µMAX PACKAGE ONLY
RFB
POWER-ON
RESET
DIN
RFB
OUT
AGND*
VDD
GND
SCLK
TOP VIEW
OUT 1
GND 2
VDD 3
LOAD 4
MAX551
MAX552
DIP
8 RFB OUT 1
7 REF AGND 2
GND 3
6 SCLK
VDD 4
5 DIN LOAD 5
MAX551
MAX552
µMAX
10 RFB
9 REF
8 CLR
7 SCLK
6 DIN
SPI and QSPI are trademarks of Motorola Inc. Microwire is a trademark of National Semiconductor Corp.
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
1 page  
+3V/+5V, 12-Bit, Serial, Multiplying DACs
in 10-Pin µMAX Package
ELECTRICAL CHARACTERISTICS —MAX552 (continued)
(VDD = +2.7V to +3.6V, VREF = 2.5V, VOUT = AGND = GND, TA = TMIN to TMAX, unless otherwise noted. Typical values are at
TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
DIGITAL INPUTS
Input High Voltage
VIH
2.1 V
Input Low Voltage
VIL
0.6 V
Input Hysteresis
HYST LOAD, CLR, DIN, and SCLK, VDD = 3V
135 mV
Input Leakage Current
CLR
IIN
VCLR = VDD
VCLR = 0V
±1
12 75 µA
SCLK, LOAD, DIN
Inputs at 0V or VDD
±1
Input Capacitance
CIN Inputs at 0V or VDD (Note 2)
8 pF
SWITCHING CHARACTERISTICS
SCLK Pulse Width High
SCLK Pulse Width Low
DIN Data to SCLK Setup
DIN Data to SCLK Hold
LOAD Pulse Width
LSB SCLK to LOAD
LOAD High to SCLK
CLR Pulse Width
POWER SUPPLY
tCH
tCL
tDS
tDH
tLD
tSL
tLC
tCLR
40 ns
40 ns
15 ns
15 ns
30 ns
0 ns
15 ns
30 ns
Supply Voltage
Supply Current
VDD
All digital inputs at VIL or VIH, CLR = VDD
IDD All digital inputs at 0V or VDD, CLR = VDD
2.7 3.6
0.1 0.5
0.07 5
V
mA
µA
Note 1: AGND and CLR are for µMAX only.
Note 2: Guaranteed by design. Not subject to production testing.
Note 3: Parametric limits are provided for design guidance, and are not production tested.
_______________________________________________________________________________________ 5
5 Page 
+3V/+5V, 12-Bit, Serial, Multiplying DACs
in 10-Pin µMAX Package
+5V (+3V)
VDD RFB OUT
REF
DGND
MAX551
MAX552 AGND
C1
MAX4167
+5V
(+3V)
10k
AC
REFERENCE
INPUT
VOUT
10k MAX4166
VDD OUT
REF
MAX551
MAX552
GND
+1.43V TO +12.6V
OUT
MAX6160
ADJ
MAX4167
106M
( ) ARE FOR MAX552
Figure 6. Single-Supply, Current Mode Operation
Figure 5 shows the MAX551 connected as a voltage
output DAC. In this mode of operation, the OUT pin is
connected to the reference-voltage source, and the
GND pin is connected to the PCB ground plane. The
DAC output now appears at the REF pin, which has a
constant resistance equal to the reference input resis-
tance (11kΩ typ). This output should be buffered with
an op amp when a lower output impedance is required.
The RFB pin is not used in this mode. The reference
input (OUT) impedance is code dependent, and the
circuit’s response time depends on the reference
source’s behavior with changing load conditions.
An advantage of voltage mode operation is that a neg-
ative reference is not required for a positive output.
Note that the reference input (OUT) must always be
positive and is limited to no more than 2V when VDD is
5V. The unipolar and bipolar circuits in Figures 3 and 4
can be converted to voltage mode.
Current Mode
Figure 6 shows the MAX551/MAX552 in a current out-
put configuration in which the output amplifier is pow-
ered from a single supply, and AGND is biased to
1.23V. With 0V applied to the REF input, the output can
be programmed from 1.23V (zero code) to 2.46V (full
( ) ARE FOR MAX552
Figure 7. Single-Supply AC Reference Input Circuit
scale). With 2.45V applied to REF, the output can be
programmed from 1.23V (zero code) to 0.01V (full
scale).
The MAX4166 op amp that drives AGND maintains the
1.23V bias as AGND’s impedance changes with the
DAC’s digital code, from high impedance (zero code)
to 7kΩ minimum (full scale).
Using an AC Reference
In applications where reference voltage has AC signal
components, the MAX551/MAX552 have multiplying
capability within the reference input range of ±6V. If the
DAC and the output amplifier are operated with a single
supply voltage, then an AC reference input can be off-
set with the circuit shown in Figure 7 to prevent the
DAC output voltage from exceeding the output amplifi-
er’s negative output rail. The reference input’s typical
-3dB bandwidth is greater than 700kHz, as shown in
the Typical Operating Characteristics graphs.
Offsetting AGND
The MAX551/MAX552 provide separate AGND and
GND inputs in the µMAX package. With this package,
AGND can be biased above GND to provide an arbi-
trary nonzero output voltage for a “0” input code
(Figure 8).
Layout, Grounding, and Bypassing
Bypass VDD with a 0.1µF capacitor, located as close to
VDD and GND as possible. The ground pins (AGND
and GND) should be connected in a star configuration
to the highest quality ground available, which should be
located as close to the MAX551/MAX552 as possible.
Since OUT and the output amplifier’s noninverting input
are sensitive to offset voltage, nodes that are to be
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MAX551.PDF ] | |
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