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ATMEGA328-PU
GENERAL DESCRIPTION
The AD5544/AD5554 quad, 16-/14-bit, current output, digital
to-analog converters (DACs) are designed to operate from a
2.7 V to 5.5 V supply range.
The applied external reference input voltage (VREFx) determines
the full-scale output current. Integrated feedback resistors (RFB)
provide temperature-tracking, full-scale voltage outputs when
combined with an external I-to-V precision amplifier.
A double-buffered serial data interface offers high speed, 3-wire,
SPI- and microcontroller-compatible inputs using serial data in
(SDI), a chip select (CS), and clock (CLK) signals. In addition,
a serial data out pin (SDO) allows for daisy-chaining when multiple
packages are used. A common, level-sensitive, load DAC strobe
(LDAC) input allows the simultaneous update of all DAC outputs
from previously loaded input registers. Additionally, an internal
power-on reset forces the output voltage to 0 at system turn-on.
The MSB pin allows system reset assertion (RS) to force all registers
to zero code when MSB = 0 or to half-scale code when MSB = 1.
FEATURES
AD5544: 16-bit resolution INL of ±1 LSB (B Grade)
AD5554: 14-bit resolution INL of ±0.5 LSB (B Grade)
2 mA full-scale current ± 20%, with VREF = ±10 V , 0.9 µs settling time to ±0.1%
12 MHz multiplying bandwidth ,Midscale glitch of −1 nV-sec
Midscale or zero-scale reset ,4 separate, 4-quadrant multiplying reference inputs
SPI-compatible, 3-wire interface ,Double-buffered registers enable
Simultaneous multichannel change ,Internal power-on reset
Temperature range: −40°C to +125°C
Compact 28-lead SSOP and 32-lead LFCSP
Product Attributes
| Mfr | Microchip Technology |
| Series | AVR® ATmega |
| Package | Tube |
| Part Status | Active |
| Core Size | 8-Bit |
| Speed | 20MHz |
| Connectivity | IC, SPI, UART/USART |
| Peripherals | Brown-out Detect/Reset, POR, PWM, WDT |
| Reset | Active High/Active Low |
| Program Memory Size | 32KB (16K x 16) |
| Voltage - Supply (Vcc/Vdd) | 1.8V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Program Memory Type | FLASH |
| Package / Case | 28-DIP (0.300", 7.62mm) |
| Supplier Device Package | 28-PDIP |
| Number of Voltages Monitored | 23 |
APPLICATIONS
Automatic test equipment
Instrumentation
Digitally controlled calibration
FUNCTIONAL BLOCK DIAGRAM
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