DAC7760_15 Datasheet, PDF (10/59 Pages) Texas Instruments – Single-Channel, 12- and 16-Bit Programmable Current Output and Voltage Output Digital-to-Analog Converters for 4-mA to 20-mA Current Loop Applications

DAC7760
DAC8760
SBAS528A – JUNE 2013 – REVISED DECEMBER 2013
NAME
ALARM
AVDD
AVSS
BOOST
CAP1
CAP2
CLR
CLR-SEL
CMP
DIN
DVDD
DVDD-EN
GND
GND
HART-IN
IOUT
ISET-R
LATCH
NC
REFOUT
REFIN
SCLK
SDO
QFN
NO.
2
36
14, 37
27
28
29
5
4
24
TSSOP
NO.
3
24
1
20
—
—
6
5
17
8
39
23
3
12, 13, 15
25
26
16
6
1, 10, 11, 19,
20, 21, 22, 30,
31, 35, 38, 40
17
18
7
9
9
2
16
4
11, 12
18
19
13
7
—
14
15
8
10
THERMAL PAD
—
—
VOUT
32
21
+VSENSE
33
22
–VSENSE
34
23
PIN DESCRIPTIONS
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DESCRIPTION
Alarm pin. Open drain output. External pullup resistor required (10 kΩ). The pin goes
low (active) when the ALARM condition is detected (open circuit, over temperature,
timeout and so forth).
Positive analog power supply.
Negative analog power supply in dual power-supply operation. Connects to GND in
single power-supply operation.
Boost pin. External transistor connection (optional).
Connection for current output filtering capacitor (optional).
Connection for current output filtering capacitor (optional).
Clear input. Logic high on this pin causes the part to enter CLEAR state. Active high.
Selects the VOUT value in CLEAR state, after power-on and reset.
External compensation capacitor connection pin (optional). Addition of the external
capacitor (connected between VOUT and this pin) improves the stability with high
capacitive loads at the VOUT pin by reducing the bandwidth of the output amplifier,
thus increasing the settling time.
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 pin.
Internal power-supply enable pin. Connect this pin to GND to disable the internal
supply, or leave this pin unconnected to enable the internal supply. When this pin is
connected to GND, an external supply must be connected to the DVDD pin.
Ground reference point for all digital circuitry of the device. Connects to 0 V.
Ground reference point for all analog circuitry of the device.
Input pin for HART modulation.
Current output pin
Connection pin for external precision resistor (15 kΩ). See the THEORY OF
OPERATION section of this data sheet.
Load DAC registers input. A rising edge on this pin loads the input shift register data
into the DAC data and control registers and updates the DAC outputs.
No connection.
Internal reference output. Connects to REFIN when using internal reference.
Reference input
Serial clock input of serial peripheral interface ( SPI™). Data can be transferred at
rates up to 30 MHz. Schmitt-Trigger logic input.
Serial data output. Data are valid on the rising edge of SCLK.
The thermal pad is internally connected to the AVSS supply. 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 AVSS pin (either
negative supply voltage or GND) or left electrically unconnected provided a supply
connection is made at the AVSS pin. The AVSS pin must always be connected to
either the negative supply voltage or GND, independent of the thermal pad
connection.
Voltage output pin. This is a buffered analog voltage output.
Sense pin for the positive voltage output load connection.
Sense pin for the negative voltage output load connection.
10
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