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MAX5302 の電気的特性と機能

MAX5302のメーカーはMaxim Integratedです、この部品の機能は「Low-Power / 12-Bit Voltage-Output DAC with Serial Interface」です。


製品の詳細 ( Datasheet PDF )

部品番号 MAX5302
部品説明 Low-Power / 12-Bit Voltage-Output DAC with Serial Interface
メーカ Maxim Integrated
ロゴ Maxim Integrated ロゴ 




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MAX5302 Datasheet, MAX5302 PDF,ピン配置, 機能
19-1559; Rev 0; 10/99
Low-Power, 12-Bit Voltage-Output DAC
with Serial Interface
__________________General Description
The MAX5302 combines a low-power, voltage-output,
12-bit digital-to-analog converter (DAC) and a precision
output amplifier in an 8-pin µMAX package. It operates
from a single +5V supply, drawing less than 280µA of
supply current.
The output amplifier’s inverting input is available to the
user, allowing specific gain configurations, remote sens-
ing, and high output current capability. This makes the
MAX5302 ideal for a wide range of applications, includ-
ing industrial process control. Other features include a
software shutdown and power-on reset.
The serial interface is SPI™/QSPI™/MICROWIRE™ com-
patible. The DAC has a double-buffered input, organized
as an input register followed by a DAC register. A 16-bit
serial word loads data into the input register. The DAC
register can be updated independently or simultaneously
with the input register. All logic inputs are TTL/CMOS-
logic compatible and buffered with Schmitt triggers to
allow direct interfacing to optocouplers.
Applications
Industrial Process Control
Automatic Test Equipment
Digital Offset and Gain Adjustment
Motion Control
Remote Industrial Control
Microprocessor-Controlled Systems
Functional Diagram
Features
o 12-Bit DAC with Configurable Output Amplifier
o +5V Single-Supply Operation
o Low Supply Current: 0.28mA Normal Operation
2µA Shutdown Mode
o Available in 8-Pin µMAX
o Power-On Reset Clears DAC Output to Zero
o SPI/QSPI/MICROWIRE Compatible
o Schmitt-Trigger Digital Inputs for Direct
Optocoupler Interface
PART
MAX5302CUA
MAX5302EUA
Ordering Information
TEMP. RANGE
0°C to +70°C
-40°C to +85°C
PIN-PACKAGE
8 µMAX
8 µMAX
Pin Configuration
GND VDD
REF
CONTROL
DAC
REGISTER
INPUT
REGISTER
CS
DIN
SCLK
16-BIT
SHIFT
REGISTER
DAC
MAX5302
FB
OUT
TOP VIEW
OUT 1
CS 2
DIN 3
SCLK 4
MAX5302
8 VDD
7 GND
6 REF
5 FB
µMAX
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 1-800-835-8769.

1 Page





MAX5302 pdf, ピン配列
Low-Power, 12-Bit Voltage-Output DAC
with Serial Interface
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 8, VDD = +5V ±10%, VREF = +2.5V, RL = 5k, CL = 100pF, TA = TMIN to TMAX, unless otherwise noted. Typical val-
ues are at TA = +25°C. Output buffer connected in unity-gain configuration.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
DIYGNITAAMLICINPPEURTFSORMANCE
Voltage Output Slew Rate
SR
0.6 V/µs
Output Settling Time
Output Voltage Swing
Current into FB
To ±1/2LSB, VSTEP = 2.5V
Rail-to-rail (Note 2)
14
0 to VDD
0.001
±0.1
µs
V
µA
Start-Up Time
20 µs
Digital Feedthrough
CS = VDD, DIN = 100kHz
5 nVs
POWER SUPPLIES
Supply Voltage
Supply Current
Supply Current in Shutdown
VDD
IDD (Note 3)
(Note 3)
4.5 5.5
0.28 0.4
4 20
V
mA
µA
Reference Current in Shutdown
0.001 ±0.5 µA
TIMING CHARACTERISTICS (Figure 6)
SCLK Clock Period
SCLK Pulse Width High
SCLK Pulse Width Low
CS Fall to SCLK Rise Setup Time
SCLK Rise to CS Rise Hold Time
tCP
tCH
tCL
tCSS
tCSH
100 ns
40 ns
40 ns
40 ns
0 ns
DIN Setup Time
DIN Hold Time
SCLK Rise to CS Fall Delay
CS Rise to SCLK Rise Hold Time
CS Pulse Width High
tDS
tDH
tCS0
tCS1
tCSW
40 ns
0 ns
40 ns
40 ns
100 ns
Note 1: Guaranteed from code 11 to code 4095 in unity-gain configuration.
Note 2: Accuracy is better than 1LSB for VOUT = 8mV to (VDD - 100mV), guaranteed by a power-supply rejection test at the end
points.
Note 3: RL = , digital inputs at GND or VDD.
_______________________________________________________________________________________ 3


3Pages


MAX5302 電子部品, 半導体
Low-Power, 12-Bit Voltage-Output DAC
with Serial Interface
_____________________Pin Description
PIN NAME
FUNCTION
1
OUT
DAC Output Voltage
2 CS Chip-Select Input. Active low.
3 DIN Serial-Data Input
4
SCLK
Serial-Clock Input
5 FB DAC Output Amplifier Feedback
6 REF Reference Voltage Input
7
GND
Ground
8 VDD Positive Power Supply
R
2R 2R
RR
2R 2R
2R
MSB
REF
AGND
SHOWN FOR ALL 1s ON DAC
Figure 1. Simplified DAC Circuit Diagram
FB
OUT
Detailed Description
The MAX5302 contains a voltage-output digital-to-analog
converter (DAC) that is easily addressed using a simple
3-wire serial interface. The IC includes a 16-bit shift
register, and has a double-buffered input composed of
an input register and a DAC register (see Functional
Diagram). In addition to the voltage output, the amplifier’s
negative input is available to the user.
The DAC is an inverted R-2R ladder network that converts
a digital input (12 data bits plus 1 sub-bit) into an
equivalent analog output voltage in proportion to the
applied reference voltage. Figure 1 shows a simplified
circuit diagram of the DAC.
Reference Inputs
The reference input accepts positive DC and AC signals.
The voltage at the reference input sets the full-scale out-
put voltage for the DAC. The reference input voltage
range is 0 to (VDD - 1.4V). The output voltage (VOUT) is
represented by a digitally programmable voltage
source, as expressed in the following equation:
VOUT = (VREF · NB / 4096) Gain
where NB is the numeric value of the DAC’s binary
input code (0 to 4095), VREF is the reference voltage,
and Gain is the externally set voltage gain.
The impedance at the reference input is code dependent,
ranging from a low value of 14kwhen the DAC has an
input code of 1554 hex, to a high value exceeding several
gigaohms (leakage currents) with an input code of
0000 hex. Because the input impedance at the reference
pin is code dependent, load regulation of the reference
source is important.
In shutdown mode, the MAX5302’s REF input enters a
high-impedance state with a typical input leakage current
of 0.001µA.
The reference input capacitance is also code dependent
and typically ranges from 15pF (with an input code of
all 0s) to 50pF (at full scale).
The MAX873 +2.5V reference is recommended for the
MAX5302.
Output Amplifier
The MAX5302’s DAC output is internally buffered by a
precision amplifier with a typical slew rate of 0.6V/µs.
Access to the output amplifier’s inverting input provides
the user greater flexibility in output gain setting/signal
conditioning (see the Applications Information section).
With a full-scale transition at the MAX5302 output, the
typical settling time to ±1/2LSB is 14µs when loaded
with 5kin parallel with 100pF (loads less than 2k
degrade performance).
The amplifier’s output dynamic responses and settling
performances are shown in the Typical Operating Char-
acteristics.
Shutdown Mode
The MAX5302 features a software-programmable shut-
down that reduces supply current to a typical value of
4µA. Writing 111X XXXX XXXX XXXX as the input control
word puts the device in shutdown mode (Table 1).
In shutdown mode, the amplifier’s output and the refer-
ence input enter a high-impedance state. The serial
interface remains active. Data in the input registers is
retained in shutdown, allowing the MAX5302 to recall
the output state prior to entering shutdown. Exit shutdown
mode by either recalling the previous configuration or
6 _______________________________________________________________________________________

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共有リンク

Link :


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