DAC7750_15 Datasheet, PDF (5/53 Pages) Texas Instruments – DACx750 Single-Channel, 12- and 16-Bit Programmable Current Output Digital-to-Analog Converters for 4-mA to 20-mA Current Loop Applications

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DAC7750, DAC8750
SBAS538A – DECEMBER 2013 – REVISED MARCH 2014
NAME
ALARM
AVDD
BOOST
CAP1
CAP2
CLR
DIN
DVDD
TERMINAL
RHA (VQFN)
2
36
27
28
29
5
8
39
DVDD-EN
23
GND
GND
HART-IN
IOUT
ISET-R
12, 13, 14, 15, 37
3, 4
24
26
16
LATCH
6
1, 10, 11, 19, 20, 21,
NC
22, 30, 31, 32, 33,
34, 35, 38, 40
R3-SENSE
25
REFOUT
17
REFIN
18
SCLK
7
SDO
9
Thermal
Pad
—
Terminal Functions
PWP (HTSSOP)
3
24
20
21
22
6
9
2
16
1, 11, 12
4, 5
17
19
13
7
DESCRIPTION
Alarm terminal. Open drain output. External pull-up resistor required (10 kΩ).
The terminal goes low (active) when the ALARM condition is detected (open
circuit/over temperature/timeout, etc.).
Positive analog power supply.
Boost terminal. External transistor connection (optional).
Connection for output filtering capacitor (optional).
Connection for output filtering capacitor (optional).
Clear input. Logic high on this terminal causes the part to enter CLEAR state.
Active high.
Serial data input. Data are clocked into the 24-bit input shift register on the
rising edge of the serial clock input. Schmitt-Trigger logic input.
Digital power supply. Can be input or output, depending on DVDD-EN terminal.
Internal power-supply enable terminal. Connect this terminal to GND to disable
the internal supply, or leave this terminal unconnected to enable the internal
supply. When this terminal is connected to GND, an external supply must be
connected to the DVDD terminal.
Ground reference point for all analog circuitry of the device.
Ground reference point for all digital circuitry of the device.
Input terminal for HART modulation.
Current output terminal
Connection terminal for external precision resistor (15 kΩ). See the Detailed
Description section of this datasheet.
Load DAC registers input. A rising edge on this terminal loads the input shift
register data into the DAC data and control registers and updates the DAC
output.
23
No connection.
This terminal is used as a monitoring feature for the output current. The voltage
18
measured between the R3-SENSE terminal and the BOOST terminal is directly
proportional to the output current.
14
Internal reference output. Connects to REFIN when using internal reference.
15
Reference input
8
Serial clock input of the SPI. Data can be transferred at rates up to 30 MHz.
Schmitt-Trigger logic input.
10
Serial data output. Data are valid on the rising edge of SCLK.
The thermal pad is internally connected to GND. It is recommended that the pad
be thermally connected to a copper plane for enhanced thermal performance.
—
The pad can be electrically connected to the same potential as the GND
terminal or left electrically unconnected provided a supply connection is made at
the GND terminal.
Copyright © 2013–2014, Texas Instruments Incorporated
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